Adding capability to set KinesisProxy using Worker.Builder (#274)

* Added IKinesisProxy injector in Worker.Builder to allow injecting custom proxy implementations

* Added unit tests for IKinesisProxy injection in Worker Builder

* Revert "Added unit tests for IKinesisProxy injection in Worker Builder"

This reverts commit aa944c1706.
Reverting to undo changes to import ordering.

* Added unit tests for IKinesisProxy injection in Worker Builder

Re-added unit tests after reverting changes to import ordering.

* Revert "Added unit tests for IKinesisProxy injection in Worker Builder"

This reverts commit 91e445774b.
Reverting to refactor unit tests.

* Added unit tests for Worker Builder IKinesisProxy injection validation

Refactored unit tests as per comments in the pull request.

* Added debug logs in KinesisLocalFileDataCreator

* Revert "Added debug logs in KinesisLocalFileDataCreator"

This reverts commit 1ff00d0b01.

* Edited JavaDoc for Worker Builder kinesisProxy

src/main/java/com/amazonaws/services/kinesis/clientlibrary/lib/worker/Worker.java

@@ -32,6 +32,7 @@ import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 
+import com.amazonaws.services.kinesis.clientlibrary.proxies.IKinesisProxy;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
@@ -996,6 +997,11 @@ public class Worker implements Runnable {
                 metricsFactory, execService);
     }
 
+    @VisibleForTesting
+    StreamConfig getStreamConfig() {
+        return streamConfig;
+    }
+
     /**
      * Given configuration, returns appropriate metrics factory.
      * 
@@ -1073,6 +1079,7 @@ public class Worker implements Runnable {
         private IMetricsFactory metricsFactory;
         private ExecutorService execService;
         private ShardPrioritization shardPrioritization;
+        private IKinesisProxy kinesisProxy;
 
         /**
          * Default constructor.
@@ -1192,6 +1199,19 @@ public class Worker implements Runnable {
             return this;
         }
 
+        /**
+         * Set KinesisProxy for the worker.
+         *
+         * @param kinesisProxy
+         *            Sets an implementation of IKinesisProxy.
+         *
+         * @return A reference to this updated object so that method calls can be chained together.
+         */
+        public Builder kinesisProxy(IKinesisProxy kinesisProxy) {
+            this.kinesisProxy = kinesisProxy;
+            return this;
+        }
+
         /**
          * Build the Worker instance.
          *
@@ -1257,13 +1277,15 @@ public class Worker implements Runnable {
             if (shardPrioritization == null) {
                 shardPrioritization = new ParentsFirstShardPrioritization(1);
             }
-
+            if (kinesisProxy == null) {
+                kinesisProxy = new KinesisProxyFactory(config.getKinesisCredentialsProvider(), kinesisClient)
+                    .getProxy(config.getStreamName());
+            }
 
             return new Worker(config.getApplicationName(),
                     recordProcessorFactory,
                     config,
-                    new StreamConfig(new KinesisProxyFactory(config.getKinesisCredentialsProvider(),
-                            kinesisClient).getProxy(config.getStreamName()),
+                    new StreamConfig(kinesisProxy,
                             config.getMaxRecords(),
                             config.getIdleTimeBetweenReadsInMillis(),
                             config.shouldCallProcessRecordsEvenForEmptyRecordList(),

src/test/java/com/amazonaws/services/kinesis/clientlibrary/lib/worker/WorkerTest.java

@@ -90,6 +90,7 @@ import com.amazonaws.services.kinesis.clientlibrary.interfaces.v2.IRecordProcess
 import com.amazonaws.services.kinesis.clientlibrary.lib.worker.Worker.WorkerCWMetricsFactory;
 import com.amazonaws.services.kinesis.clientlibrary.lib.worker.Worker.WorkerThreadPoolExecutor;
 import com.amazonaws.services.kinesis.clientlibrary.proxies.IKinesisProxy;
+import com.amazonaws.services.kinesis.clientlibrary.proxies.KinesisProxy;
 import com.amazonaws.services.kinesis.clientlibrary.proxies.KinesisLocalFileProxy;
 import com.amazonaws.services.kinesis.clientlibrary.proxies.util.KinesisLocalFileDataCreator;
 import com.amazonaws.services.kinesis.clientlibrary.types.ExtendedSequenceNumber;
@@ -1474,6 +1475,31 @@ public class WorkerTest {
 
     }
 
+    @Test
+    public void testBuilderWithDefaultKinesisProxy() {
+        IRecordProcessorFactory recordProcessorFactory = mock(IRecordProcessorFactory.class);
+        Worker worker = new Worker.Builder()
+            .recordProcessorFactory(recordProcessorFactory)
+            .config(config)
+            .build();
+        Assert.assertNotNull(worker.getStreamConfig().getStreamProxy());
+        Assert.assertTrue(worker.getStreamConfig().getStreamProxy() instanceof KinesisProxy);
+    }
+
+    @Test
+    public void testBuilderWhenKinesisProxyIsSet() {
+        IRecordProcessorFactory recordProcessorFactory = mock(IRecordProcessorFactory.class);
+        // Create an instance of KinesisLocalFileProxy for injection and validation
+        IKinesisProxy kinesisProxy = mock(KinesisLocalFileProxy.class);
+        Worker worker = new Worker.Builder()
+            .recordProcessorFactory(recordProcessorFactory)
+            .config(config)
+            .kinesisProxy(kinesisProxy)
+            .build();
+        Assert.assertNotNull(worker.getStreamConfig().getStreamProxy());
+        Assert.assertTrue(worker.getStreamConfig().getStreamProxy() instanceof KinesisLocalFileProxy);
+    }
+
     private abstract class InjectableWorker extends Worker {
         InjectableWorker(String applicationName, IRecordProcessorFactory recordProcessorFactory,
                 KinesisClientLibConfiguration config, StreamConfig streamConfig,