Add support for stream ARNs (#1109)

Add support for referencing streams by streamARN in single-stream mode, or by the combination of streamARN and creationEpoch in multi-stream mode.

amazon-kinesis-client/pom.xml

@@ -75,11 +75,6 @@
       <artifactId>netty-nio-client</artifactId>
       <version>${awssdk.version}</version>
     </dependency>
-    <dependency>
-      <groupId>software.amazon.awssdk</groupId>
-      <artifactId>sts</artifactId>
-      <version>${awssdk.version}</version>
-    </dependency>
     <dependency>
       <groupId>software.amazon.glue</groupId>
       <artifactId>schema-registry-serde</artifactId>
@@ -139,20 +134,6 @@
       <scope>test</scope>
     </dependency>
 
-    <dependency>
-      <groupId>org.powermock</groupId>
-      <artifactId>powermock-module-junit4</artifactId>
-      <version>1.7.4</version>
-      <scope>test</scope>
-    </dependency>
-
-    <dependency>
-      <groupId>org.powermock</groupId>
-      <artifactId>powermock-api-mockito</artifactId>
-      <version>1.7.4</version>
-      <scope>test</scope>
-    </dependency>
-
     <dependency>
       <groupId>org.hamcrest</groupId>
       <artifactId>hamcrest-all</artifactId>

amazon-kinesis-client/src/main/java/software/amazon/kinesis/common/ConfigsBuilder.java

@@ -25,6 +25,7 @@ import org.apache.commons.lang3.StringUtils;
 
 import lombok.NonNull;
 import lombok.experimental.Accessors;
+import software.amazon.awssdk.arns.Arn;
 import software.amazon.awssdk.services.cloudwatch.CloudWatchAsyncClient;
 import software.amazon.awssdk.services.dynamodb.DynamoDbAsyncClient;
 import software.amazon.awssdk.services.kinesis.KinesisAsyncClient;
@@ -128,7 +129,7 @@ public class ConfigsBuilder {
     }
 
     /**
-     * Constructor to initialize ConfigsBuilder for a single stream.
+     * Constructor to initialize ConfigsBuilder for a single stream identified by name.
      *
      * @param streamName
      * @param applicationName
@@ -142,7 +143,31 @@ public class ConfigsBuilder {
             @NonNull KinesisAsyncClient kinesisClient, @NonNull DynamoDbAsyncClient dynamoDBClient,
             @NonNull CloudWatchAsyncClient cloudWatchClient, @NonNull String workerIdentifier,
             @NonNull ShardRecordProcessorFactory shardRecordProcessorFactory) {
-        this(new SingleStreamTracker(streamName, kinesisClient.serviceClientConfiguration().region()),
+        this(new SingleStreamTracker(streamName),
+                applicationName,
+                kinesisClient,
+                dynamoDBClient,
+                cloudWatchClient,
+                workerIdentifier,
+                shardRecordProcessorFactory);
+    }
+
+    /**
+     * Constructor to initialize ConfigsBuilder for a single stream identified by {@link Arn}.
+     *
+     * @param streamArn
+     * @param applicationName
+     * @param kinesisClient
+     * @param dynamoDBClient
+     * @param cloudWatchClient
+     * @param workerIdentifier
+     * @param shardRecordProcessorFactory
+     */
+    public ConfigsBuilder(@NonNull Arn streamArn, @NonNull String applicationName,
+                          @NonNull KinesisAsyncClient kinesisClient, @NonNull DynamoDbAsyncClient dynamoDBClient,
+                          @NonNull CloudWatchAsyncClient cloudWatchClient, @NonNull String workerIdentifier,
+                          @NonNull ShardRecordProcessorFactory shardRecordProcessorFactory) {
+        this(new SingleStreamTracker(streamArn),
                 applicationName,
                 kinesisClient,
                 dynamoDBClient,

amazon-kinesis-client/src/main/java/software/amazon/kinesis/common/FunctionCache.java

@@ -1,50 +0,0 @@
-/*
- * Copyright 2023 Amazon.com, Inc. or its affiliates.
- * Licensed under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package software.amazon.kinesis.common;
-
-import java.util.function.Function;
-
-import lombok.RequiredArgsConstructor;
-
-/**
- * Caches the result from a {@link Function}. Caching is especially useful when
- * invoking the function is an expensive call that produces a reusable result.
- * If the input value should be fixed, {@link SupplierCache} may be used.
- * <br/><br/>
- * Note that if {@code f(x)=X} is cached, {@code X} will be returned for every
- * successive query of this cache regardless of the input parameter. This is
- * by design under the assumption that {@code X} is a viable response for
- * other invocations.
- *
- * @param <IN> input type
- * @param <OUT> output type
- */
-@RequiredArgsConstructor
-public class FunctionCache<IN, OUT> extends SynchronizedCache<OUT> {
-
-    private final Function<IN, OUT> function;
-
-    /**
-     * Returns the cached result. If the cache is null, the function will be
-     * invoked to populate the cache.
-     *
-     * @param input input argument to the underlying function
-     * @return cached result which may be null
-     */
-    public OUT get(final IN input) {
-        return get(() -> function.apply(input));
-    }
-
-}

amazon-kinesis-client/src/main/java/software/amazon/kinesis/common/StreamARNUtil.java

@@ -1,86 +0,0 @@
-/*
- * Copyright 2023 Amazon.com, Inc. or its affiliates.
- * Licensed under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package software.amazon.kinesis.common;
-
-import lombok.AccessLevel;
-import lombok.NoArgsConstructor;
-import lombok.extern.slf4j.Slf4j;
-import software.amazon.awssdk.arns.Arn;
-import software.amazon.awssdk.awscore.exception.AwsServiceException;
-import software.amazon.awssdk.core.exception.SdkClientException;
-import software.amazon.awssdk.http.SdkHttpClient;
-import software.amazon.awssdk.http.urlconnection.UrlConnectionHttpClient;
-import software.amazon.awssdk.regions.Region;
-import software.amazon.awssdk.services.sts.StsClient;
-import software.amazon.awssdk.services.sts.model.GetCallerIdentityResponse;
-
-import java.util.Optional;
-
-@Slf4j
-@NoArgsConstructor(access = AccessLevel.PRIVATE)
-public final class StreamARNUtil {
-
-    /**
-     * Caches an {@link Arn} constructed from a {@link StsClient#getCallerIdentity()} call.
-     */
-    private static final SupplierCache<Arn> CALLER_IDENTITY_ARN = new SupplierCache<>(() -> {
-        try (final SdkHttpClient httpClient = UrlConnectionHttpClient.builder().build();
-                final StsClient stsClient = StsClient.builder().httpClient(httpClient).build()) {
-            final GetCallerIdentityResponse response = stsClient.getCallerIdentity();
-            final Arn arn = Arn.fromString(response.arn());
-
-            // guarantee the cached ARN will never have an empty accountId
-            arn.accountId().orElseThrow(() -> new IllegalStateException("AccountId is not present on " + arn));
-            return arn;
-        } catch (AwsServiceException | SdkClientException e) {
-            log.warn("Unable to get sts caller identity to build stream arn", e);
-            return null;
-        }
-    });
-
-    /**
-     * Retrieves the stream ARN using the stream name, region, and accountId returned by STS.
-     * It is designed to fail gracefully, returning Optional.empty() if any errors occur.
-     *
-     * @param streamName stream name
-     * @param kinesisRegion Kinesis client endpoint, and also where the stream(s) to be
-     *          processed are located. A null guarantees an empty ARN.
-     */
-    public static Optional<Arn> getStreamARN(String streamName, Region kinesisRegion) {
-        return getStreamARN(streamName, kinesisRegion, null);
-    }
-
-    public static Optional<Arn> getStreamARN(String streamName, Region kinesisRegion, String accountId) {
-        if (kinesisRegion == null) {
-            return Optional.empty();
-        }
-
-        final Arn identityArn = CALLER_IDENTITY_ARN.get();
-        if (identityArn == null) {
-            return Optional.empty();
-        }
-
-        // the provided accountId takes precedence
-        final String chosenAccountId = (accountId != null) ? accountId : identityArn.accountId().get();
-        return Optional.of(Arn.builder()
-                .partition(identityArn.partition())
-                .service("kinesis")
-                .region(kinesisRegion.toString())
-                .accountId(chosenAccountId)
-                .resource("stream/" + streamName)
-                .build());
-    }
-
-}

amazon-kinesis-client/src/main/java/software/amazon/kinesis/common/StreamIdentifier.java

@@ -23,9 +23,7 @@ import lombok.NonNull;
 import lombok.experimental.Accessors;
 import software.amazon.awssdk.arns.Arn;
 import software.amazon.awssdk.regions.Region;
-import software.amazon.awssdk.services.kinesis.model.DescribeStreamSummaryResponse;
 import software.amazon.awssdk.utils.Validate;
-import software.amazon.kinesis.retrieval.KinesisClientFacade;
 
 import java.util.Optional;
 import java.util.regex.Matcher;
@@ -42,9 +40,10 @@ public class StreamIdentifier {
     @NonNull
     private final String streamName;
     @Builder.Default
-    private Optional<Long> streamCreationEpochOptional = Optional.empty();
+    private final Optional<Long> streamCreationEpochOptional = Optional.empty();
     @Builder.Default
-    private final Optional<Arn> streamARNOptional = Optional.empty();
+    @EqualsAndHashCode.Exclude
+    private final Optional<Arn> streamArnOptional = Optional.empty();
 
     /**
      * Pattern for a serialized {@link StreamIdentifier}. The valid format is
@@ -59,39 +58,25 @@ public class StreamIdentifier {
      * where {@code region} is the id representation of a {@link Region}.
      */
     private static final Pattern STREAM_ARN_PATTERN = Pattern.compile(
-            "arn:aws:kinesis:(?<region>[-a-z0-9]+):(?<accountId>[0-9]{12}):stream/(?<streamName>.+)");
+            "arn:aws[^:]*:kinesis:(?<region>[-a-z0-9]+):(?<accountId>[0-9]{12}):stream/(?<streamName>.+)");
 
     /**
      * Serialize the current StreamIdentifier instance.
      *
-     * @return a String of {@code account:stream:creationEpoch[:region]}
+     * @return a String of {@code account:stream:creationEpoch} in multi-stream mode
-     *      where {@code region} is the id representation of a {@link Region}
+     *         or {@link #streamName} in single-stream mode.
-     *      and is optional.
      */
     public String serialize() {
-        if (!accountIdOptional.isPresent()) {
+        if (!streamCreationEpochOptional.isPresent()) {
+            // creation epoch is expected to be empty in single-stream mode
             return streamName;
         }
 
-        if (!streamCreationEpochOptional.isPresent()) {
-            // FIXME bias-for-action hack to simplify back-porting into KCL 1.x and facilitate the
-            //      backwards-compatible requirement. There's a chicken-and-egg issue if DSS is
-            //      called as the application is being configured (and before the client is rigged).
-            //      Furthermore, if epoch isn't lazy-loaded here, the problem quickly spirals into
-            //      systemic issues of concurrency and consistency (e.g., PeriodicShardSyncManager,
-            //      Scheduler, DDB leases). We should look at leveraging dependency injection.
-            //      (NOTE: not to inject the Kinesis client here, but to ensure the client is
-            //      accessible elsewhere ASAP.)
-            final DescribeStreamSummaryResponse dss = KinesisClientFacade.describeStreamSummary(
-                    streamARNOptional().get().toString());
-            final long creationEpoch = dss.streamDescriptionSummary().streamCreationTimestamp().getEpochSecond();
-            streamCreationEpochOptional = Optional.of(creationEpoch);
-        }
-
         final char delimiter = ':';
-        final StringBuilder sb = new StringBuilder(accountIdOptional.get()).append(delimiter)
+        final StringBuilder sb = new StringBuilder()
-                .append(streamName).append(delimiter);
+                .append(accountIdOptional.get()).append(delimiter)
-        streamCreationEpochOptional.ifPresent(sb::append);
+                .append(streamName).append(delimiter)
+                .append(streamCreationEpochOptional.get());
         return sb.toString();
     }
 
@@ -101,129 +86,98 @@ public class StreamIdentifier {
     }
 
     /**
-     * Create a multi stream instance for StreamIdentifier from serialized stream identifier.
+     * Create a multi stream instance for StreamIdentifier from serialized stream identifier
+     * of format {@link #STREAM_IDENTIFIER_PATTERN}
      *
-     * @param serializationOrArn serialized {@link StreamIdentifier} or AWS ARN of a Kinesis stream
+     * @param streamIdentifierSer a String of {@code account:stream:creationEpoch}
-     *
+     * @return StreamIdentifier with {@link #accountIdOptional} and {@link #streamCreationEpochOptional} present
-     * @see #multiStreamInstance(String, Region)
-     * @see #serialize()
      */
-    public static StreamIdentifier multiStreamInstance(String serializationOrArn) {
+    public static StreamIdentifier multiStreamInstance(String streamIdentifierSer) {
-        return multiStreamInstance(serializationOrArn, null);
+        final Matcher matcher = STREAM_IDENTIFIER_PATTERN.matcher(streamIdentifierSer);
+        if (matcher.matches()) {
+            final String accountId = matcher.group("accountId");
+            final String streamName = matcher.group("streamName");
+            final Long creationEpoch = Long.valueOf(matcher.group("creationEpoch"));
+
+            validateCreationEpoch(creationEpoch);
+
+            return StreamIdentifier.builder()
+                    .accountIdOptional(Optional.of(accountId))
+                    .streamName(streamName)
+                    .streamCreationEpochOptional(Optional.of(creationEpoch))
+                    .build();
+        }
+
+        throw new IllegalArgumentException("Unable to deserialize StreamIdentifier from " + streamIdentifierSer);
     }
 
     /**
-     * Create a multi stream instance for StreamIdentifier from serialized stream identifier.
+     * Create a multi stream instance for StreamIdentifier from stream {@link Arn}.
      *
-     * @param serializationOrArn serialized {@link StreamIdentifier} or AWS ARN of a Kinesis stream
+     * @param streamArn an {@link Arn} of format {@link #STREAM_ARN_PATTERN}
-     * @param kinesisRegion Kinesis client endpoint, and also where the stream(s) to be
+     * @param creationEpoch Creation epoch of the stream. This value will
-     *          processed are located. A null will default to the caller's region.
+     *         reflect in the lease key and is assumed to be correct. (KCL could
-     *
+     *         verify, but that creates issues for both bootstrapping and, with large
-     * @see #multiStreamInstance(String)
+     *         KCL applications, API throttling against DescribeStreamSummary.)
-     * @see #serialize()
+     *         If this epoch is reused for two identically-named streams in the same
+     *         account -- such as deleting and recreating a stream -- then KCL will
+     *         <b>be unable to differentiate leases between the old and new stream</b>
+     *         since the lease keys collide on this creation epoch.
+     * @return StreamIdentifier with {@link #accountIdOptional}, {@link #streamCreationEpochOptional},
+     *         and {@link #streamArnOptional} present
      */
-    public static StreamIdentifier multiStreamInstance(String serializationOrArn, Region kinesisRegion) {
+    public static StreamIdentifier multiStreamInstance(Arn streamArn, long creationEpoch) {
-        final StreamIdentifier fromSerialization = fromSerialization(serializationOrArn, kinesisRegion);
+        validateArn(streamArn);
-        if (fromSerialization != null) {
+        validateCreationEpoch(creationEpoch);
-            return fromSerialization;
-        }
-        final StreamIdentifier fromArn = fromArn(serializationOrArn, kinesisRegion);
-        if (fromArn != null) {
-            return fromArn;
-        }
 
-        throw new IllegalArgumentException("Unable to deserialize StreamIdentifier from " + serializationOrArn);
+        return StreamIdentifier.builder()
+                .accountIdOptional(streamArn.accountId())
+                .streamName(streamArn.resource().resource())
+                .streamCreationEpochOptional(Optional.of(creationEpoch))
+                .streamArnOptional(Optional.of(streamArn))
+                .build();
     }
 
     /**
      * Create a single stream instance for StreamIdentifier from stream name.
      *
-     * @param streamNameOrArn stream name or AWS ARN of a Kinesis stream
+     * @param streamName stream name of a Kinesis stream
-     *
-     * @see #singleStreamInstance(String, Region)
      */
-    public static StreamIdentifier singleStreamInstance(String streamNameOrArn) {
+    public static StreamIdentifier singleStreamInstance(String streamName) {
-        return singleStreamInstance(streamNameOrArn, null);
+        Validate.notEmpty(streamName, "StreamName should not be empty");
-    }
-
-    /**
-     * Create a single stream instance for StreamIdentifier from the provided stream name and kinesisRegion.
-     * This method also constructs the optional StreamARN based on the region info.
-     *
-     * @param streamNameOrArn stream name or AWS ARN of a Kinesis stream
-     * @param kinesisRegion Kinesis client endpoint, and also where the stream(s) to be
-     *          processed are located. A null will default to the caller's region.
-     *
-     * @see #singleStreamInstance(String)
-     */
-    public static StreamIdentifier singleStreamInstance(String streamNameOrArn, Region kinesisRegion) {
-        Validate.notEmpty(streamNameOrArn, "StreamName should not be empty");
-
-        final StreamIdentifier fromArn = fromArn(streamNameOrArn, kinesisRegion);
-        if (fromArn != null) {
-            return fromArn;
-        }
 
         return StreamIdentifier.builder()
-                .streamName(streamNameOrArn)
-                .streamARNOptional(StreamARNUtil.getStreamARN(streamNameOrArn, kinesisRegion))
-                .build();
-    }
-
-    /**
-     * Deserializes a StreamIdentifier from {@link #STREAM_IDENTIFIER_PATTERN}.
-     *
-     * @param input input string (e.g., ARN, serialized instance) to convert into an instance
-     * @param kinesisRegion Kinesis client endpoint, and also where the stream(s) to be
-     *          processed are located. A null will default to the caller's region.
-     * @return a StreamIdentifier instance if the pattern matched, otherwise null
-     */
-    private static StreamIdentifier fromSerialization(final String input, final Region kinesisRegion) {
-        final Matcher matcher = STREAM_IDENTIFIER_PATTERN.matcher(input);
-        return matcher.matches()
-                ? toStreamIdentifier(matcher, matcher.group("creationEpoch"), kinesisRegion) : null;
-    }
-
-    /**
-     * Constructs a StreamIdentifier from {@link #STREAM_ARN_PATTERN}.
-     *
-     * @param input input string (e.g., ARN, serialized instance) to convert into an instance
-     * @param kinesisRegion Kinesis client endpoint, and also where the stream(s) to be
-     *          processed are located. A null will default to the caller's region.
-     * @return a StreamIdentifier instance if the pattern matched, otherwise null
-     */
-    private static StreamIdentifier fromArn(final String input, final Region kinesisRegion) {
-        final Matcher matcher = STREAM_ARN_PATTERN.matcher(input);
-        if (matcher.matches()) {
-            final String arnRegion = matcher.group("region");
-            final Region region = (arnRegion != null) ? Region.of(arnRegion) : kinesisRegion;
-            if ((kinesisRegion != null) && (region != kinesisRegion)) {
-                throw new IllegalArgumentException(String.format(
-                        "Cannot create StreamIdentifier for a region other than %s: %s", kinesisRegion, input));
-            }
-            return toStreamIdentifier(matcher, "", region);
-        }
-        return null;
-    }
-
-    private static StreamIdentifier toStreamIdentifier(final Matcher matcher, final String matchedEpoch,
-            final Region kinesisRegion) {
-        final String accountId = matcher.group("accountId");
-        final String streamName = matcher.group("streamName");
-        final Optional<Long> creationEpoch = matchedEpoch.isEmpty() ? Optional.empty()
-                : Optional.of(Long.valueOf(matchedEpoch));
-        final Optional<Arn> arn = StreamARNUtil.getStreamARN(streamName, kinesisRegion, accountId);
-
-        if (!creationEpoch.isPresent() && !arn.isPresent()) {
-            throw new IllegalArgumentException("Cannot create StreamIdentifier if missing both ARN and creation epoch");
-        }
-
-        return StreamIdentifier.builder()
-                .accountIdOptional(Optional.of(accountId))
                 .streamName(streamName)
-                .streamCreationEpochOptional(creationEpoch)
-                .streamARNOptional(arn)
                 .build();
     }
 
+    /**
+     * Create a single stream instance for StreamIdentifier from AWS Kinesis stream {@link Arn}.
+     *
+     * @param streamArn AWS ARN of a Kinesis stream
+     * @return StreamIdentifier with {@link #accountIdOptional} and {@link #streamArnOptional} present
+     */
+    public static StreamIdentifier singleStreamInstance(Arn streamArn) {
+        validateArn(streamArn);
+
+        return StreamIdentifier.builder()
+                .accountIdOptional(streamArn.accountId())
+                .streamName(streamArn.resource().resource())
+                .streamArnOptional(Optional.of(streamArn))
+                .build();
+    }
+
+    private static void validateArn(Arn streamArn) {
+        if (!STREAM_ARN_PATTERN.matcher(streamArn.toString()).matches() || !streamArn.region().isPresent()) {
+            throw new IllegalArgumentException("Unable to create a StreamIdentifier from " + streamArn);
+        }
+    }
+
+    private static void validateCreationEpoch(long creationEpoch) {
+        if (creationEpoch <= 0) {
+            throw new IllegalArgumentException(
+                    "Creation epoch must be > 0; received " + creationEpoch);
+        }
+    }
+
 }

amazon-kinesis-client/src/main/java/software/amazon/kinesis/common/SupplierCache.java

@@ -1,42 +0,0 @@
-/*
- * Copyright 2023 Amazon.com, Inc. or its affiliates.
- * Licensed under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package software.amazon.kinesis.common;
-
-import java.util.function.Supplier;
-
-import lombok.RequiredArgsConstructor;
-
-/**
- * Caches results from a {@link Supplier}. Caching is especially useful when
- * {@link Supplier#get()} is an expensive call that produces static results.
- *
- * @param <T> result type
- */
-@RequiredArgsConstructor
-public class SupplierCache<T> extends SynchronizedCache<T> {
-
-    private final Supplier<T> supplier;
-
-    /**
-     * Returns the cached result. If the cache is null, the supplier will be
-     * invoked to populate the cache.
-     *
-     * @return cached result which may be null
-     */
-    public T get() {
-        return get(supplier);
-    }
-
-}

amazon-kinesis-client/src/main/java/software/amazon/kinesis/common/SynchronizedCache.java

@@ -1,48 +0,0 @@
-/*
- * Copyright 2023 Amazon.com, Inc. or its affiliates.
- * Licensed under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package software.amazon.kinesis.common;
-
-import java.util.function.Supplier;
-
-/**
- * A synchronized, "no frills" cache that preserves the first non-null value
- * returned from a {@link Supplier}.
- *
- * @param <R> result type
- */
-public class SynchronizedCache<R> {
-
-    private volatile R result;
-
-    /**
-     * Returns the cached result. If the cache is null, the supplier will be
-     * invoked to populate the cache.
-     *
-     * @param supplier supplier to invoke if the cache is null
-     * @return cached result which may be null
-     */
-    protected R get(final Supplier<R> supplier) {
-        if (result == null) {
-            synchronized (this) {
-                // double-check lock
-                if (result == null) {
-                    result = supplier.get();
-                }
-            }
-        }
-        return result;
-    }
-
-}

amazon-kinesis-client/src/main/java/software/amazon/kinesis/leases/KinesisShardDetector.java

@@ -223,8 +223,7 @@ public class KinesisShardDetector implements ShardDetector {
         ListShardsRequest.Builder builder = KinesisRequestsBuilder.listShardsRequestBuilder();
         if (StringUtils.isEmpty(nextToken)) {
             builder.streamName(streamIdentifier.streamName()).shardFilter(shardFilter);
-            streamIdentifier.streamARNOptional().ifPresent(arn -> builder.streamARN(arn.toString()));
+            streamIdentifier.streamArnOptional().ifPresent(arn -> builder.streamARN(arn.toString()));
-
         } else {
             builder.nextToken(nextToken);
         }
@@ -313,7 +312,7 @@ public class KinesisShardDetector implements ShardDetector {
                 .streamName(streamIdentifier.streamName())
                 .shardIteratorType(ShardIteratorType.LATEST)
                 .shardId(shardId);
-        streamIdentifier.streamARNOptional().ifPresent(arn -> requestBuilder.streamARN(arn.toString()));
+        streamIdentifier.streamArnOptional().ifPresent(arn -> requestBuilder.streamARN(arn.toString()));
         final GetShardIteratorRequest getShardIteratorRequest = requestBuilder.build();
 
         final GetShardIteratorResponse getShardIteratorResponse =

amazon-kinesis-client/src/main/java/software/amazon/kinesis/processor/SingleStreamTracker.java

@@ -21,7 +21,7 @@ import java.util.List;
 import lombok.EqualsAndHashCode;
 import lombok.NonNull;
 import lombok.ToString;
-import software.amazon.awssdk.regions.Region;
+import software.amazon.awssdk.arns.Arn;
 import software.amazon.kinesis.common.InitialPositionInStreamExtended;
 import software.amazon.kinesis.common.StreamConfig;
 import software.amazon.kinesis.common.StreamIdentifier;
@@ -49,8 +49,8 @@ public class SingleStreamTracker implements StreamTracker {
         this(StreamIdentifier.singleStreamInstance(streamName));
     }
 
-    public SingleStreamTracker(String streamName, Region region) {
+    public SingleStreamTracker(Arn streamArn) {
-        this(StreamIdentifier.singleStreamInstance(streamName, region));
+        this(StreamIdentifier.singleStreamInstance(streamArn));
     }
 
     public SingleStreamTracker(StreamIdentifier streamIdentifier) {

amazon-kinesis-client/src/main/java/software/amazon/kinesis/retrieval/KinesisClientFacade.java

@@ -1,114 +0,0 @@
-/*
- * Copyright 2023 Amazon.com, Inc. or its affiliates.
- * Licensed under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package software.amazon.kinesis.retrieval;
-
-import java.util.concurrent.ExecutionException;
-import java.util.concurrent.TimeoutException;
-
-import lombok.NonNull;
-import lombok.extern.slf4j.Slf4j;
-import software.amazon.awssdk.services.kinesis.KinesisAsyncClient;
-import software.amazon.awssdk.services.kinesis.model.DescribeStreamSummaryRequest;
-import software.amazon.awssdk.services.kinesis.model.DescribeStreamSummaryResponse;
-import software.amazon.awssdk.services.kinesis.model.KinesisException;
-import software.amazon.awssdk.services.kinesis.model.LimitExceededException;
-import software.amazon.awssdk.services.kinesis.model.ResourceInUseException;
-import software.amazon.awssdk.services.kinesis.model.ResourceNotFoundException;
-import software.amazon.kinesis.common.KinesisRequestsBuilder;
-
-/**
- * Facade pattern to simplify interactions with a {@link KinesisAsyncClient}.
- */
-@Slf4j
-public final class KinesisClientFacade {
-
-    /**
-     * Reusable {@link AWSExceptionManager}.
-     * <p>
-     * N.B. This instance is mutable, but thread-safe for <b>read-only</b> use.
-     * </p>
-     */
-    private static final AWSExceptionManager AWS_EXCEPTION_MANAGER;
-
-    // FIXME dependency injection
-    private static KinesisAsyncClient kinesisClient;
-
-    static {
-        AWS_EXCEPTION_MANAGER = new AWSExceptionManager();
-        AWS_EXCEPTION_MANAGER.add(KinesisException.class, t -> t);
-        AWS_EXCEPTION_MANAGER.add(LimitExceededException.class, t -> t);
-        AWS_EXCEPTION_MANAGER.add(ResourceInUseException.class, t -> t);
-        AWS_EXCEPTION_MANAGER.add(ResourceNotFoundException.class, t -> t);
-    }
-
-    static void initialize(final KinesisAsyncClient client) {
-        kinesisClient = client;
-    }
-
-    public static DescribeStreamSummaryResponse describeStreamSummary(final String streamArn) {
-        final DescribeStreamSummaryRequest request = KinesisRequestsBuilder
-                .describeStreamSummaryRequestBuilder().streamARN(streamArn).build();
-        final ServiceCallerSupplier<DescribeStreamSummaryResponse> dss =
-                () -> kinesisClient.describeStreamSummary(request).get();
-        return retryWhenThrottled(dss, 3, streamArn, "DescribeStreamSummary");
-    }
-
-    // FIXME code lifted-and-shifted from FanOutConsumerRegistration; that class
-    //      (and others) should not be responsible for interacting directly with
-    //      the thread-safe Kinesis client (and handling retries, etc.)
-    private static <T> T retryWhenThrottled(
-            @NonNull final ServiceCallerSupplier<T> retriever,
-            final int maxRetries,
-            final String streamArn,
-            @NonNull final String apiName) {
-        LimitExceededException finalException = null;
-
-        int retries = maxRetries;
-        while (retries > 0) {
-            try {
-                try {
-                    return retriever.get();
-                } catch (ExecutionException e) {
-                    throw AWS_EXCEPTION_MANAGER.apply(e.getCause());
-                } catch (InterruptedException e) {
-                    throw KinesisException.create("Unable to complete " + apiName, e);
-                } catch (TimeoutException te) {
-                    log.info("Timed out waiting for " + apiName + " for " + streamArn);
-                }
-            } catch (LimitExceededException e) {
-                log.info("{} : Throttled while calling {} API, will backoff.", streamArn, apiName);
-                try {
-                    Thread.sleep(1000 + (long) (Math.random() * 100));
-                } catch (InterruptedException ie) {
-                    log.debug("Sleep interrupted, shutdown invoked.");
-                }
-                finalException = e;
-            }
-            retries--;
-        }
-
-        if (finalException == null) {
-            throw new IllegalStateException(streamArn + " : Exhausted retries while calling " + apiName);
-        }
-
-        throw finalException;
-    }
-
-    @FunctionalInterface
-    private interface ServiceCallerSupplier<T> {
-        T get() throws ExecutionException, InterruptedException, TimeoutException;
-    }
-
-}

amazon-kinesis-client/src/main/java/software/amazon/kinesis/retrieval/RetrievalConfig.java

@@ -22,6 +22,7 @@ import lombok.NonNull;
 import lombok.Setter;
 import lombok.ToString;
 import lombok.experimental.Accessors;
+import software.amazon.awssdk.arns.Arn;
 import software.amazon.awssdk.services.kinesis.KinesisAsyncClient;
 import software.amazon.awssdk.utils.Either;
 import software.amazon.kinesis.common.DeprecationUtils;
@@ -119,9 +120,12 @@ public class RetrievalConfig {
 
     public RetrievalConfig(@NonNull KinesisAsyncClient kinesisAsyncClient, @NonNull String streamName,
                            @NonNull String applicationName) {
-        this(kinesisAsyncClient,
+        this(kinesisAsyncClient, new SingleStreamTracker(streamName), applicationName);
-                new SingleStreamTracker(streamName, kinesisAsyncClient.serviceClientConfiguration().region()),
+    }
-                applicationName);
+
+    public RetrievalConfig(@NonNull KinesisAsyncClient kinesisAsyncClient, @NonNull Arn streamArn,
+                           @NonNull String applicationName) {
+        this(kinesisAsyncClient, new SingleStreamTracker(streamArn), applicationName);
     }
 
     public RetrievalConfig(@NonNull KinesisAsyncClient kinesisAsyncClient, @NonNull StreamTracker streamTracker,
@@ -131,8 +135,6 @@ public class RetrievalConfig {
         this.applicationName = applicationName;
         this.appStreamTracker = DeprecationUtils.convert(streamTracker,
                 singleStreamTracker -> singleStreamTracker.streamConfigList().get(0));
-
-        KinesisClientFacade.initialize(kinesisAsyncClient);
     }
 
     /**

amazon-kinesis-client/src/main/java/software/amazon/kinesis/retrieval/polling/KinesisDataFetcher.java

@@ -238,7 +238,7 @@ public class KinesisDataFetcher implements DataFetcher {
 
         GetShardIteratorRequest.Builder builder = KinesisRequestsBuilder.getShardIteratorRequestBuilder()
                 .streamName(streamIdentifier.streamName()).shardId(shardId);
-        streamIdentifier.streamARNOptional().ifPresent(arn -> builder.streamARN(arn.toString()));
+        streamIdentifier.streamArnOptional().ifPresent(arn -> builder.streamARN(arn.toString()));
 
         GetShardIteratorRequest request;
         if (isIteratorRestart) {
@@ -321,7 +321,7 @@ public class KinesisDataFetcher implements DataFetcher {
     public GetRecordsRequest getGetRecordsRequest(String nextIterator) {
         GetRecordsRequest.Builder builder = KinesisRequestsBuilder.getRecordsRequestBuilder()
                 .shardIterator(nextIterator).limit(maxRecords);
-        streamIdentifier.streamARNOptional().ifPresent(arn -> builder.streamARN(arn.toString()));
+        streamIdentifier.streamArnOptional().ifPresent(arn -> builder.streamARN(arn.toString()));
         return builder.build();
     }
 

amazon-kinesis-client/src/test/java/software/amazon/kinesis/common/ConfigsBuilderTest.java

@@ -26,6 +26,8 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.runners.MockitoJUnitRunner;
+import software.amazon.awssdk.arns.Arn;
+import software.amazon.awssdk.regions.Region;
 import software.amazon.awssdk.services.cloudwatch.CloudWatchAsyncClient;
 import software.amazon.awssdk.services.dynamodb.DynamoDbAsyncClient;
 import software.amazon.awssdk.services.kinesis.KinesisAsyncClient;
@@ -33,12 +35,12 @@ import software.amazon.kinesis.processor.MultiStreamTracker;
 import software.amazon.kinesis.processor.ShardRecordProcessorFactory;
 import software.amazon.kinesis.processor.SingleStreamTracker;
 import software.amazon.kinesis.processor.StreamTracker;
-import software.amazon.kinesis.utils.MockObjectHelper;
 
 @RunWith(MockitoJUnitRunner.class)
 public class ConfigsBuilderTest {
 
-    private final KinesisAsyncClient mockKinesisClient = MockObjectHelper.createKinesisClient();
+    @Mock
+    private KinesisAsyncClient mockKinesisClient;
 
     @Mock
     private DynamoDbAsyncClient mockDynamoClient;
@@ -53,18 +55,24 @@ public class ConfigsBuilderTest {
     private static final String WORKER_IDENTIFIER = "worker-id";
 
     @Test
-    public void testTrackerConstruction() {
+    public void testSingleStreamTrackerConstruction() {
         final String streamName = "single-stream";
-        final ConfigsBuilder configByName = createConfig(streamName);
+        final Arn streamArn = createArn(streamName);
-        final ConfigsBuilder configBySingleTracker = createConfig(new SingleStreamTracker(streamName));
 
-        for (final ConfigsBuilder cb : Arrays.asList(configByName, configBySingleTracker)) {
+        for (final ConfigsBuilder cb : Arrays.asList(
+                createConfig(streamName),
+                createConfig(new SingleStreamTracker(streamName)),
+                createConfig(streamArn),
+                createConfig(new SingleStreamTracker(streamArn)))) {
             assertEquals(Optional.empty(), cb.appStreamTracker().left());
             assertEquals(streamName, cb.appStreamTracker().right().get());
             assertEquals(streamName, cb.streamTracker().streamConfigList().get(0).streamIdentifier().streamName());
             assertFalse(cb.streamTracker().isMultiStream());
         }
+    }
 
+    @Test
+    public void testMultiStreamTrackerConstruction() {
         final StreamTracker mockMultiStreamTracker = mock(MultiStreamTracker.class);
         final ConfigsBuilder configByMultiTracker = createConfig(mockMultiStreamTracker);
         assertEquals(Optional.empty(), configByMultiTracker.appStreamTracker().right());
@@ -78,9 +86,25 @@ public class ConfigsBuilderTest {
                 mockCloudWatchClient, WORKER_IDENTIFIER, mockShardProcessorFactory);
     }
 
+    private ConfigsBuilder createConfig(Arn streamArn) {
+        // intentional invocation of constructor where streamArn is an Arn
+        return new ConfigsBuilder(streamArn, APPLICATION_NAME, mockKinesisClient, mockDynamoClient,
+                mockCloudWatchClient, WORKER_IDENTIFIER, mockShardProcessorFactory);
+    }
+
     private ConfigsBuilder createConfig(StreamTracker streamTracker) {
         return new ConfigsBuilder(streamTracker, APPLICATION_NAME, mockKinesisClient, mockDynamoClient,
                 mockCloudWatchClient, WORKER_IDENTIFIER, mockShardProcessorFactory);
     }
 
+    private static Arn createArn(String streamName) {
+        return Arn.builder()
+                .partition("aws")
+                .service("kinesis")
+                .region(Region.US_EAST_1.id())
+                .accountId("123456789012")
+                .resource("stream/" + streamName)
+                .build();
+    }
+
 }

amazon-kinesis-client/src/test/java/software/amazon/kinesis/common/FunctionCacheTest.java

@@ -1,61 +0,0 @@
-/*
- * Copyright 2023 Amazon.com, Inc. or its affiliates.
- * Licensed under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package software.amazon.kinesis.common;
-
-import java.util.function.Function;
-
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNull;
-import static org.mockito.Matchers.anyInt;
-import static org.mockito.Mockito.times;
-import static org.mockito.Mockito.verify;
-import static org.mockito.Mockito.when;
-
-import org.junit.Before;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.mockito.Mock;
-import org.mockito.runners.MockitoJUnitRunner;
-
-@RunWith(MockitoJUnitRunner.class)
-public class FunctionCacheTest {
-
-    @Mock
-    private Function<Integer, Object> mockFunction;
-
-    private FunctionCache<Integer, Object> cache;
-
-    @Before
-    public void setUp() {
-        cache = new FunctionCache<>(mockFunction);
-    }
-
-    /**
-     * Test that the cache stops invoking the encapsulated {@link Function}
-     * after it returns a non-null value.
-     */
-    @Test
-    public void testCache() {
-        final int expectedValue = 3;
-        when(mockFunction.apply(expectedValue)).thenReturn(expectedValue);
-
-        assertNull(cache.get(1));
-        assertNull(cache.get(2));
-        assertEquals(expectedValue, cache.get(3));
-        assertEquals(expectedValue, cache.get(4));
-        assertEquals(expectedValue, cache.get(5));
-        verify(mockFunction, times(expectedValue)).apply(anyInt());
-    }
-}

amazon-kinesis-client/src/test/java/software/amazon/kinesis/common/StreamARNUtilTest.java

@@ -1,201 +0,0 @@
-/*
- * Copyright 2023 Amazon.com, Inc. or its affiliates.
- * Licensed under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package software.amazon.kinesis.common;
-
-import org.junit.Before;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.mockito.Mock;
-import org.mockito.MockitoAnnotations;
-import org.powermock.api.mockito.PowerMockito;
-import org.powermock.core.classloader.annotations.PrepareForTest;
-import org.powermock.modules.junit4.PowerMockRunner;
-import org.powermock.reflect.Whitebox;
-import software.amazon.awssdk.arns.Arn;
-import software.amazon.awssdk.awscore.exception.AwsServiceException;
-import software.amazon.awssdk.core.exception.SdkClientException;
-import software.amazon.awssdk.http.SdkHttpClient;
-import software.amazon.awssdk.http.urlconnection.UrlConnectionHttpClient;
-import software.amazon.awssdk.regions.Region;
-import software.amazon.awssdk.services.sts.StsClient;
-import software.amazon.awssdk.services.sts.StsClientBuilder;
-import software.amazon.awssdk.services.sts.model.GetCallerIdentityResponse;
-
-import java.lang.reflect.Field;
-import java.util.Optional;
-
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
-import static org.mockito.Mockito.any;
-import static org.mockito.Mockito.doReturn;
-import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.spy;
-import static org.mockito.Mockito.times;
-import static org.mockito.Mockito.verify;
-import static org.mockito.Mockito.verifyZeroInteractions;
-import static org.mockito.Mockito.when;
-
-@RunWith(PowerMockRunner.class)
-@PrepareForTest({ StreamARNUtil.class, StsClient.class, UrlConnectionHttpClient.class })
-public class StreamARNUtilTest {
-    private static final String STS_RESPONSE_ARN_FORMAT = "arn:aws:sts::%s:assumed-role/Admin/alias";
-    private static final String KINESIS_STREAM_ARN_FORMAT = "arn:aws:kinesis:us-east-1:%s:stream/%s";
-
-    /**
-     * Original {@link SupplierCache} that is constructed on class load.
-     */
-    private static final SupplierCache<Arn> ORIGINAL_CACHE = Whitebox.getInternalState(
-            StreamARNUtil.class, "CALLER_IDENTITY_ARN");
-
-    private static final String ACCOUNT_ID = "12345";
-
-    private static final String STREAM_NAME = StreamARNUtilTest.class.getSimpleName();
-
-    @Mock
-    private StsClientBuilder mockStsClientBuilder;
-
-    @Mock
-    private StsClient mockStsClient;
-
-    private SupplierCache<Arn> spySupplierCache;
-
-    @Before
-    public void setUp() throws Exception {
-        MockitoAnnotations.initMocks(this);
-
-        spySupplierCache = spy(ORIGINAL_CACHE);
-        setUpSupplierCache(spySupplierCache);
-
-        final Arn defaultArn = toArn(STS_RESPONSE_ARN_FORMAT, ACCOUNT_ID);
-        doReturn(defaultArn).when(spySupplierCache).get();
-    }
-
-    private void setUpSts() {
-        PowerMockito.mockStatic(StsClient.class);
-        PowerMockito.mockStatic(UrlConnectionHttpClient.class);
-
-        when(UrlConnectionHttpClient.builder()).thenReturn(mock(UrlConnectionHttpClient.Builder.class));
-        when(StsClient.builder()).thenReturn(mockStsClientBuilder);
-        when(mockStsClientBuilder.httpClient(any(SdkHttpClient.class))).thenReturn(mockStsClientBuilder);
-        when(mockStsClientBuilder.build()).thenReturn(mockStsClient);
-
-        // bypass the spy so the Sts clients are called
-        when(spySupplierCache.get()).thenCallRealMethod();
-    }
-
-    /**
-     * Wrap and embed the original {@link SupplierCache} with a spy to avoid
-     * one-and-done cache behavior, provide each test precise control over
-     * return values, and enable the ability to verify interactions via Mockito.
-     */
-    static void setUpSupplierCache(final SupplierCache<Arn> cache) throws Exception {
-        final Field f = StreamARNUtil.class.getDeclaredField("CALLER_IDENTITY_ARN");
-        f.setAccessible(true);
-        f.set(null, cache);
-        f.setAccessible(false);
-    }
-
-    @Test
-    public void testGetStreamARNHappyCase() {
-        getStreamArn();
-
-        verify(spySupplierCache).get();
-    }
-
-    @Test
-    public void testGetStreamARNFromCache() {
-        final Optional<Arn> actualStreamARNOptional1 = getStreamArn();
-        final Optional<Arn> actualStreamARNOptional2 = getStreamArn();
-
-        verify(spySupplierCache, times(2)).get();
-        assertEquals(actualStreamARNOptional1, actualStreamARNOptional2);
-    }
-
-    @Test
-    public void testGetStreamARNReturnsEmptyOnSTSError() {
-        setUpSts();
-
-        // Optional.empty() is expected when there is an error with the STS call and STS returns empty Arn
-        when(mockStsClient.getCallerIdentity())
-                .thenThrow(AwsServiceException.builder().message("testAwsServiceException").build())
-                .thenThrow(SdkClientException.builder().message("testSdkClientException").build());
-
-        assertEquals(Optional.empty(), StreamARNUtil.getStreamARN(STREAM_NAME, Region.US_EAST_1));
-        assertEquals(Optional.empty(), StreamARNUtil.getStreamARN(STREAM_NAME, Region.US_EAST_1));
-        verify(mockStsClient, times(2)).getCallerIdentity();
-        verify(spySupplierCache, times(2)).get();
-    }
-
-    @Test(expected = IllegalStateException.class)
-    public void testStsResponseWithoutAccountId() {
-        setUpSts();
-
-        final Arn arnWithoutAccountId = toArn(STS_RESPONSE_ARN_FORMAT, "");
-        assertEquals(Optional.empty(), arnWithoutAccountId.accountId());
-
-        final GetCallerIdentityResponse identityResponse = GetCallerIdentityResponse.builder()
-                        .arn(arnWithoutAccountId.toString()).build();
-        when(mockStsClient.getCallerIdentity()).thenReturn(identityResponse);
-
-        try {
-            StreamARNUtil.getStreamARN(STREAM_NAME, Region.US_EAST_1);
-        } finally {
-            verify(mockStsClient).getCallerIdentity();
-        }
-    }
-
-    @Test
-    public void testGetStreamARNReturnsEmptyOnInvalidKinesisRegion() {
-        // Optional.empty() is expected when kinesis region is not set correctly
-        Optional<Arn> actualStreamARNOptional = StreamARNUtil.getStreamARN(STREAM_NAME, null);
-        assertEquals(Optional.empty(), actualStreamARNOptional);
-        verifyZeroInteractions(mockStsClient);
-        verifyZeroInteractions(spySupplierCache);
-    }
-
-    @Test
-    public void testGetStreamARNWithProvidedAccountIDAndIgnoredSTSResult() {
-        // If the account id is provided in the StreamIdentifier, it will override the result (account id) returned by sts
-        final String cachedAccountId = "111111111111";
-        final String providedAccountId = "222222222222";
-
-        final Arn cachedArn = toArn(STS_RESPONSE_ARN_FORMAT, cachedAccountId);
-        when(spySupplierCache.get()).thenReturn(cachedArn);
-
-        final Optional<Arn> actualStreamARNOptional = StreamARNUtil.getStreamARN(STREAM_NAME, Region.US_EAST_1,
-                providedAccountId);
-        final Arn expectedStreamARN = toArn(KINESIS_STREAM_ARN_FORMAT, providedAccountId, STREAM_NAME);
-
-        verify(spySupplierCache).get();
-        verifyZeroInteractions(mockStsClient);
-        assertTrue(actualStreamARNOptional.isPresent());
-        assertEquals(expectedStreamARN, actualStreamARNOptional.get());
-    }
-
-    private static Optional<Arn> getStreamArn() {
-        final Optional<Arn> actualArn = StreamARNUtil.getStreamARN(STREAM_NAME, Region.US_EAST_1);
-        final Arn expectedArn = toArn(KINESIS_STREAM_ARN_FORMAT, ACCOUNT_ID, STREAM_NAME);
-
-        assertTrue(actualArn.isPresent());
-        assertEquals(expectedArn, actualArn.get());
-
-        return actualArn;
-    }
-
-    private static Arn toArn(final String format, final Object... params) {
-        return Arn.fromString(String.format(format, params));
-    }
-
-}

amazon-kinesis-client/src/test/java/software/amazon/kinesis/common/StreamIdentifierTest.java

@@ -1,11 +1,7 @@
 package software.amazon.kinesis.common;
 
 import org.junit.Assert;
-import org.junit.BeforeClass;
 import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.powermock.core.classloader.annotations.PrepareForTest;
-import org.powermock.modules.junit4.PowerMockRunner;
 import software.amazon.awssdk.arns.Arn;
 import software.amazon.awssdk.regions.Region;
 
@@ -13,27 +9,16 @@ import java.util.Arrays;
 import java.util.Optional;
 
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertNotEquals;
-import static org.mockito.Mockito.when;
-import static org.powermock.api.mockito.PowerMockito.mockStatic;
-import static org.powermock.api.mockito.PowerMockito.verifyStatic;
-import static software.amazon.kinesis.common.StreamARNUtil.getStreamARN;
 
-@RunWith(PowerMockRunner.class)
-@PrepareForTest(StreamARNUtil.class)
 public class StreamIdentifierTest {
     private static final String STREAM_NAME = "stream-name";
+    private static final String PARTITION = "aws";
+    private static final String SERVICE = "kinesis";
     private static final Region KINESIS_REGION = Region.US_WEST_1;
     private static final String TEST_ACCOUNT_ID = "123456789012";
+    private static final String RESOURCE = "stream/" + STREAM_NAME;
     private static final long EPOCH = 1680616058L;
-
+    private static final Arn DEFAULT_ARN = createArn();
-    private static final Arn DEFAULT_ARN = toArn(KINESIS_REGION);
-
-    @BeforeClass
-    public static void setUpBeforeClass() throws Exception {
-        StreamARNUtilTest.setUpSupplierCache(new SupplierCache<>(() -> DEFAULT_ARN));
-    }
 
     /**
      * Test patterns that should match a serialization regex.
@@ -51,74 +36,86 @@ public class StreamIdentifierTest {
     @Test
     public void testMultiStreamDeserializationFail() {
         for (final String pattern : Arrays.asList(
-                // arn examples
-                "arn:aws:kinesis::123456789012:stream/stream-name", // missing region
-                "arn:aws:kinesis:region::stream/stream-name", // missing account id
-                "arn:aws:kinesis:region:123456789:stream/stream-name", // account id not 12 digits
-                "arn:aws:kinesis:region:123456789abc:stream/stream-name", // 12char alphanumeric account id
-                "arn:aws:kinesis:region:123456789012:stream/", // missing stream-name
-                // serialization examples
                 ":stream-name:123", // missing account id
 //                "123456789:stream-name:123", // account id not 12 digits
                 "123456789abc:stream-name:123", // 12char alphanumeric account id
                 "123456789012::123", // missing stream name
                 "123456789012:stream-name", // missing delimiter and creation epoch
                 "123456789012:stream-name:", // missing creation epoch
+                "123456789012:stream-name:-123", // negative creation epoch
                 "123456789012:stream-name:abc", // non-numeric creation epoch
                 ""
         )) {
             try {
                 StreamIdentifier.multiStreamInstance(pattern);
-                Assert.fail(pattern + " should not have created a StreamIdentifier");
+                Assert.fail("Serialization " + pattern + " should not have created a StreamIdentifier");
             } catch (final IllegalArgumentException iae) {
                 // expected; ignore
             }
         }
     }
 
+    /**
+     * Test ARNs that <b>should not</b> match a valid AWS Kinesis stream ARN.
+     */
     @Test
-    public void testInstanceFromArn() {
+    public void testMultiStreamByArnWithInvalidStreamArnFail() {
-        final Arn arn = toArn(KINESIS_REGION);
+        for (final Arn invalidStreamArn : Arrays.asList(
-        final StreamIdentifier single = StreamIdentifier.singleStreamInstance(arn.toString());
+                createArn("abc", SERVICE,  KINESIS_REGION, TEST_ACCOUNT_ID, RESOURCE), // invalid partition
-        final StreamIdentifier multi = StreamIdentifier.multiStreamInstance(arn.toString());
+                createArn(PARTITION, "dynamodb",  KINESIS_REGION, TEST_ACCOUNT_ID, RESOURCE), // incorrect service
-
+                createArn(PARTITION, SERVICE,  null, TEST_ACCOUNT_ID, RESOURCE), // missing region
-        assertEquals(single, multi);
+                createArn(PARTITION, SERVICE,  KINESIS_REGION, null, RESOURCE), // missing account id
-        assertEquals(Optional.empty(), single.streamCreationEpochOptional());
+                createArn(PARTITION, SERVICE,  KINESIS_REGION, "123456789", RESOURCE), // account id not 12 digits
-        assertActualStreamIdentifierExpected(arn, single);
+                createArn(PARTITION, SERVICE,  KINESIS_REGION, "123456789abc", RESOURCE), // 12char alphanumeric account id
+                createArn(PARTITION, SERVICE,  KINESIS_REGION, TEST_ACCOUNT_ID, "table/name"), // incorrect resource type
+                Arn.fromString("arn:aws:dynamodb:us-east-2:123456789012:table/myDynamoDBTable") // valid ARN for incorrect resource
+        )) {
+            try {
+                StreamIdentifier.multiStreamInstance(invalidStreamArn, EPOCH);
+                Assert.fail("Arn " + invalidStreamArn + " should not have created a StreamIdentifier");
+            } catch (final IllegalArgumentException iae) {
+                // expected; ignore
+            }
+        }
     }
 
     @Test(expected = IllegalArgumentException.class)
-    public void testInstanceWithoutEpochOrArn() {
+    public void testNegativeCreationEpoch() {
-        mockStatic(StreamARNUtil.class);
+        StreamIdentifier.multiStreamInstance(DEFAULT_ARN, -123);
-        when(getStreamARN(STREAM_NAME, KINESIS_REGION, TEST_ACCOUNT_ID))
-                .thenReturn(Optional.empty());
-
-        try {
-            StreamIdentifier.singleStreamInstance(DEFAULT_ARN.toString());
-        } finally {
-            verifyStatic(StreamARNUtil.class);
-            getStreamARN(STREAM_NAME, KINESIS_REGION, TEST_ACCOUNT_ID);
     }
+
+    @Test(expected = IllegalArgumentException.class)
+    public void testZeroCreationEpoch() {
+        StreamIdentifier.multiStreamInstance(DEFAULT_ARN, 0);
+    }
+
+    @Test
+    public void testSingleStreamInstanceFromArn() {
+        final StreamIdentifier actualStreamIdentifier = StreamIdentifier.singleStreamInstance(DEFAULT_ARN);
+
+        assertActualStreamIdentifierExpected(DEFAULT_ARN, actualStreamIdentifier);
+        assertEquals(Optional.empty(), actualStreamIdentifier.streamCreationEpochOptional());
+        assertEquals(actualStreamIdentifier.streamName(), actualStreamIdentifier.serialize());
+    }
+
+    @Test
+    public void testMultiStreamInstanceFromArn() {
+        final StreamIdentifier actualStreamIdentifier = StreamIdentifier.multiStreamInstance(DEFAULT_ARN, EPOCH);
+
+        assertActualStreamIdentifierExpected(DEFAULT_ARN, actualStreamIdentifier);
+        assertEquals(Optional.of(EPOCH), actualStreamIdentifier.streamCreationEpochOptional());
+        assertEquals(serialize(), actualStreamIdentifier.serialize());
     }
 
     @Test
     public void testSingleStreamInstanceWithName() {
         StreamIdentifier actualStreamIdentifier = StreamIdentifier.singleStreamInstance(STREAM_NAME);
-        assertFalse(actualStreamIdentifier.streamCreationEpochOptional().isPresent());
+        assertEquals(Optional.empty(), actualStreamIdentifier.streamCreationEpochOptional());
-        assertFalse(actualStreamIdentifier.accountIdOptional().isPresent());
+        assertEquals(Optional.empty(), actualStreamIdentifier.accountIdOptional());
-        assertFalse(actualStreamIdentifier.streamARNOptional().isPresent());
+        assertEquals(Optional.empty(), actualStreamIdentifier.streamArnOptional());
         assertEquals(STREAM_NAME, actualStreamIdentifier.streamName());
     }
 
-    @Test
-    public void testSingleStreamInstanceWithNameAndRegion() {
-        StreamIdentifier actualStreamIdentifier = StreamIdentifier.singleStreamInstance(STREAM_NAME, KINESIS_REGION);
-        assertFalse(actualStreamIdentifier.streamCreationEpochOptional().isPresent());
-        assertFalse(actualStreamIdentifier.accountIdOptional().isPresent());
-        assertEquals(STREAM_NAME, actualStreamIdentifier.streamName());
-        assertEquals(Optional.of(DEFAULT_ARN), actualStreamIdentifier.streamARNOptional());
-    }
-
     @Test
     public void testMultiStreamInstanceWithIdentifierSerialization() {
         StreamIdentifier actualStreamIdentifier = StreamIdentifier.multiStreamInstance(serialize());
@@ -126,34 +123,10 @@ public class StreamIdentifierTest {
         assertEquals(Optional.of(EPOCH), actualStreamIdentifier.streamCreationEpochOptional());
     }
 
-    /**
-     * When KCL's Kinesis endpoint is a region, it lacks visibility to streams
-     * in other regions. Therefore, when the endpoint and ARN conflict, an
-     * Exception should be thrown.
-     */
-    @Test(expected = IllegalArgumentException.class)
-    public void testConflictOnRegions() {
-        final Region arnRegion = Region.US_GOV_EAST_1;
-        assertNotEquals(arnRegion, KINESIS_REGION);
-
-        StreamIdentifier.multiStreamInstance(toArn(arnRegion).toString(), KINESIS_REGION);
-    }
-
-    @Test
-    public void testMultiStreamInstanceWithoutRegionSerialized() {
-        StreamIdentifier actualStreamIdentifier = StreamIdentifier.multiStreamInstance(
-                serialize(), KINESIS_REGION);
-        assertActualStreamIdentifierExpected(actualStreamIdentifier);
-    }
-
-    private void assertActualStreamIdentifierExpected(StreamIdentifier actual) {
-        assertActualStreamIdentifierExpected(DEFAULT_ARN, actual);
-    }
-
     private void assertActualStreamIdentifierExpected(Arn expectedArn, StreamIdentifier actual) {
         assertEquals(STREAM_NAME, actual.streamName());
         assertEquals(Optional.of(TEST_ACCOUNT_ID), actual.accountIdOptional());
-        assertEquals(Optional.ofNullable(expectedArn), actual.streamARNOptional());
+        assertEquals(Optional.ofNullable(expectedArn), actual.streamArnOptional());
     }
 
     /**
@@ -163,11 +136,18 @@ public class StreamIdentifierTest {
         return String.join(":", TEST_ACCOUNT_ID, STREAM_NAME, Long.toString(EPOCH));
     }
 
-    private static Arn toArn(final Region region) {
+    private static Arn createArn() {
-        return Arn.builder().partition("aws").service("kinesis")
+        return createArn(PARTITION, SERVICE, KINESIS_REGION, TEST_ACCOUNT_ID, RESOURCE);
-                .accountId(TEST_ACCOUNT_ID)
+    }
-                .resource("stream/" + STREAM_NAME)
+
-                .region(region.toString())
+    private static Arn createArn(String partition, String service, Region region, String account, String resource) {
+        return Arn.builder()
+                .partition(partition)
+                .service(service)
+                .region(region != null ? region.id() : null)
+                .accountId(account)
+                .resource(resource)
                 .build();
     }
+
 }

amazon-kinesis-client/src/test/java/software/amazon/kinesis/common/SupplierCacheTest.java

@@ -1,70 +0,0 @@
-/*
- * Copyright 2023 Amazon.com, Inc. or its affiliates.
- * Licensed under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package software.amazon.kinesis.common;
-
-import java.util.function.Supplier;
-
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertSame;
-import static org.mockito.Mockito.times;
-import static org.mockito.Mockito.verify;
-import static org.mockito.Mockito.when;
-
-import org.junit.Before;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.mockito.Mock;
-import org.mockito.runners.MockitoJUnitRunner;
-
-@RunWith(MockitoJUnitRunner.class)
-public class SupplierCacheTest {
-
-    private static final Object DUMMY_RESULT = SupplierCacheTest.class;
-
-    @Mock
-    private Supplier<Object> mockSupplier;
-
-    private SupplierCache<Object> cache;
-
-    @Before
-    public void setUp() {
-        cache = new SupplierCache<>(mockSupplier);
-    }
-
-    @Test
-    public void testCache() {
-        when(mockSupplier.get()).thenReturn(DUMMY_RESULT);
-
-        final Object result1 = cache.get();
-        final Object result2 = cache.get();
-
-        assertEquals(DUMMY_RESULT, result1);
-        assertSame(result1, result2);
-        verify(mockSupplier).get();
-    }
-
-    @Test
-    public void testCacheWithNullResult() {
-        when(mockSupplier.get()).thenReturn(null).thenReturn(DUMMY_RESULT);
-
-        final Object result1 = cache.get();
-        final Object result2 = cache.get();
-
-        assertNull(result1);
-        assertEquals(DUMMY_RESULT, result2);
-        verify(mockSupplier, times(2)).get();
-    }
-}

amazon-kinesis-client/src/test/java/software/amazon/kinesis/common/SynchronizedCacheTest.java

@@ -1,62 +0,0 @@
-/*
- * Copyright 2023 Amazon.com, Inc. or its affiliates.
- * Licensed under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package software.amazon.kinesis.common;
-
-import java.util.function.Supplier;
-
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNull;
-import static org.junit.Assert.assertSame;
-import static org.mockito.Mockito.times;
-import static org.mockito.Mockito.verify;
-import static org.mockito.Mockito.when;
-
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.mockito.Mock;
-import org.mockito.runners.MockitoJUnitRunner;
-
-@RunWith(MockitoJUnitRunner.class)
-public class SynchronizedCacheTest {
-
-    private static final Object DUMMY_RESULT = SynchronizedCacheTest.class;
-
-    @Mock
-    private Supplier<Object> mockSupplier;
-
-    private final SynchronizedCache<Object> cache = new SynchronizedCache<>();
-
-    @Test
-    public void testCache() {
-        when(mockSupplier.get()).thenReturn(DUMMY_RESULT);
-
-        final Object result1 = cache.get(mockSupplier);
-        final Object result2 = cache.get(mockSupplier);
-
-        assertEquals(DUMMY_RESULT, result1);
-        assertSame(result1, result2);
-        verify(mockSupplier).get();
-    }
-
-    @Test
-    public void testCacheWithNullResult() {
-        when(mockSupplier.get()).thenReturn(null).thenReturn(DUMMY_RESULT);
-
-        assertNull(cache.get(mockSupplier));
-        assertEquals(DUMMY_RESULT, cache.get(mockSupplier));
-        assertEquals(DUMMY_RESULT, cache.get(mockSupplier));
-        verify(mockSupplier, times(2)).get();
-    }
-}

amazon-kinesis-client/src/test/java/software/amazon/kinesis/coordinator/SchedulerTest.java

@@ -112,7 +112,6 @@ import software.amazon.kinesis.retrieval.RecordsPublisher;
 import software.amazon.kinesis.retrieval.RetrievalConfig;
 import software.amazon.kinesis.retrieval.RetrievalFactory;
 import software.amazon.kinesis.retrieval.kpl.ExtendedSequenceNumber;
-import software.amazon.kinesis.utils.MockObjectHelper;
 
 /**
  *
@@ -138,6 +137,7 @@ public class SchedulerTest {
     private ProcessorConfig processorConfig;
     private RetrievalConfig retrievalConfig;
 
+    @Mock
     private KinesisAsyncClient kinesisClient;
     @Mock
     private DynamoDbAsyncClient dynamoDBClient;
@@ -180,7 +180,6 @@ public class SchedulerTest {
         lifecycleConfig = new LifecycleConfig();
         metricsConfig = new MetricsConfig(cloudWatchClient, namespace);
         processorConfig = new ProcessorConfig(shardRecordProcessorFactory);
-        kinesisClient = MockObjectHelper.createKinesisClient();
         retrievalConfig = new RetrievalConfig(kinesisClient, streamName, applicationName)
                 .retrievalFactory(retrievalFactory);
         when(leaseCoordinator.leaseRefresher()).thenReturn(dynamoDBLeaseRefresher);

amazon-kinesis-client/src/test/java/software/amazon/kinesis/retrieval/KinesisClientFacadeTest.java

@@ -1,80 +0,0 @@
-/*
- * Copyright 2023 Amazon.com, Inc. or its affiliates.
- * Licensed under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package software.amazon.kinesis.retrieval;
-
-import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.ExecutionException;
-
-import static org.junit.Assert.assertEquals;
-import static org.mockito.Mockito.any;
-import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.times;
-import static org.mockito.Mockito.verify;
-import static org.mockito.Mockito.when;
-import static software.amazon.kinesis.retrieval.KinesisClientFacade.describeStreamSummary;
-
-import org.junit.Before;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.mockito.Mock;
-import org.mockito.runners.MockitoJUnitRunner;
-import software.amazon.awssdk.services.kinesis.KinesisAsyncClient;
-import software.amazon.awssdk.services.kinesis.model.DescribeStreamSummaryRequest;
-import software.amazon.awssdk.services.kinesis.model.DescribeStreamSummaryResponse;
-import software.amazon.awssdk.services.kinesis.model.LimitExceededException;
-
-@RunWith(MockitoJUnitRunner.class)
-public class KinesisClientFacadeTest {
-
-    @Mock
-    private KinesisAsyncClient mockKinesisClient;
-
-    @Before
-    public void setUp() {
-        KinesisClientFacade.initialize(mockKinesisClient);
-    }
-
-    @Test
-    public void testDescribeStreamSummary() {
-        final DescribeStreamSummaryResponse expectedResponse = DescribeStreamSummaryResponse.builder().build();
-        when(mockKinesisClient.describeStreamSummary(any(DescribeStreamSummaryRequest.class)))
-                .thenReturn(CompletableFuture.completedFuture(expectedResponse));
-
-        final DescribeStreamSummaryResponse actualResponse = describeStreamSummary("narf");
-        assertEquals(expectedResponse, actualResponse);
-
-        verify(mockKinesisClient).describeStreamSummary(any(DescribeStreamSummaryRequest.class));
-    }
-
-    @Test
-    public void testDescribeStreamSummaryRetries() throws Exception {
-        final DescribeStreamSummaryResponse expectedResponse = DescribeStreamSummaryResponse.builder().build();
-        final CompletableFuture<DescribeStreamSummaryResponse> mockFuture = mock(CompletableFuture.class);
-        final ExecutionException executionException = new ExecutionException(LimitExceededException.builder().build());
-
-        when(mockKinesisClient.describeStreamSummary(any(DescribeStreamSummaryRequest.class)))
-                .thenReturn(mockFuture);
-        when(mockFuture.get())
-                .thenThrow(executionException)
-                .thenThrow(executionException)
-                .thenReturn(expectedResponse);
-
-        final DescribeStreamSummaryResponse actualResponse = describeStreamSummary("retry me plz");
-        assertEquals(expectedResponse, actualResponse);
-
-        verify(mockKinesisClient, times(3)).describeStreamSummary(any(DescribeStreamSummaryRequest.class));
-        verify(mockFuture, times(3)).get();
-    }
-}

amazon-kinesis-client/src/test/java/software/amazon/kinesis/retrieval/RetrievalConfigTest.java

@@ -18,19 +18,21 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.Mock;
 import org.mockito.runners.MockitoJUnitRunner;
+import software.amazon.awssdk.arns.Arn;
+import software.amazon.awssdk.regions.Region;
 import software.amazon.awssdk.services.kinesis.KinesisAsyncClient;
 import software.amazon.kinesis.common.InitialPositionInStreamExtended;
 import software.amazon.kinesis.common.StreamConfig;
 import software.amazon.kinesis.processor.MultiStreamTracker;
 import software.amazon.kinesis.processor.SingleStreamTracker;
 import software.amazon.kinesis.processor.StreamTracker;
-import software.amazon.kinesis.utils.MockObjectHelper;
 
 @RunWith(MockitoJUnitRunner.class)
 public class RetrievalConfigTest {
 
     private static final String APPLICATION_NAME = RetrievalConfigTest.class.getSimpleName();
 
+    @Mock
     private KinesisAsyncClient mockKinesisClient;
 
     @Mock
@@ -38,24 +40,28 @@ public class RetrievalConfigTest {
 
     @Before
     public void setUp() {
-        mockKinesisClient = MockObjectHelper.createKinesisClient(true);
         when(mockMultiStreamTracker.isMultiStream()).thenReturn(true);
     }
 
     @Test
-    public void testTrackerConstruction() {
+    public void testSingleStreamTrackerConstruction() {
         final String streamName = "single-stream";
-        final RetrievalConfig configByName = createConfig(streamName);
+        final Arn streamArn = createArn(streamName);
-        final SingleStreamTracker singleTracker = new SingleStreamTracker(streamName);
-        final RetrievalConfig configBySingleTracker = createConfig(singleTracker);
 
-        for (final RetrievalConfig rc : Arrays.asList(configByName, configBySingleTracker)) {
+        for (final RetrievalConfig rc : Arrays.asList(
+                createConfig(streamName),
+                createConfig(new SingleStreamTracker(streamName)),
+                createConfig(streamArn),
+                createConfig(new SingleStreamTracker(streamArn)))) {
             assertEquals(Optional.empty(), rc.appStreamTracker().left());
-            assertEquals(singleTracker, rc.streamTracker());
+            assertEquals(streamName, rc.streamTracker().streamConfigList().get(0).streamIdentifier().streamName());
             assertEquals(1, rc.streamTracker().streamConfigList().size());
             assertFalse(rc.streamTracker().isMultiStream());
         }
+    }
 
+    @Test
+    public void testMultiStreamTrackerConstruction() {
         final StreamTracker mockMultiStreamTracker = mock(MultiStreamTracker.class);
         final RetrievalConfig configByMultiTracker = createConfig(mockMultiStreamTracker);
         assertEquals(Optional.empty(), configByMultiTracker.appStreamTracker().right());
@@ -110,8 +116,22 @@ public class RetrievalConfigTest {
         return new RetrievalConfig(mockKinesisClient, streamName, APPLICATION_NAME);
     }
 
+    private RetrievalConfig createConfig(Arn streamArn) {
+        return new RetrievalConfig(mockKinesisClient, streamArn, APPLICATION_NAME);
+    }
+
     private RetrievalConfig createConfig(StreamTracker streamTracker) {
         return new RetrievalConfig(mockKinesisClient, streamTracker, APPLICATION_NAME);
     }
 
+    private static Arn createArn(String streamName) {
+        return Arn.builder()
+                .partition("aws")
+                .service("kinesis")
+                .region(Region.US_EAST_1.id())
+                .accountId("123456789012")
+                .resource("stream/" + streamName)
+                .build();
+    }
+
 }

amazon-kinesis-client/src/test/java/software/amazon/kinesis/utils/MockObjectHelper.java

@@ -1,31 +0,0 @@
-package software.amazon.kinesis.utils;
-
-import software.amazon.awssdk.regions.Region;
-import software.amazon.awssdk.services.kinesis.KinesisAsyncClient;
-import software.amazon.awssdk.services.kinesis.KinesisServiceClientConfiguration;
-
-import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.when;
-
-public final class MockObjectHelper {
-
-    public static KinesisAsyncClient createKinesisClient() {
-        return createKinesisClient(Region.US_EAST_1);
-    }
-
-    /**
-     * @param isRegionDummy a boolean to determine whether to use a null value for the Kinesis client's region.
-     * @return
-     */
-    public static KinesisAsyncClient createKinesisClient(boolean isRegionDummy) {
-        return isRegionDummy ? createKinesisClient(null) : createKinesisClient();
-    }
-
-    public static KinesisAsyncClient createKinesisClient(Region region) {
-        KinesisAsyncClient kinesisClient = mock(KinesisAsyncClient.class);
-        when(kinesisClient.serviceClientConfiguration()).
-                thenReturn(KinesisServiceClientConfiguration.builder().region(region).build());
-        return kinesisClient;
-    }
-
-}