47 lines
2.1 KiB
Java
47 lines
2.1 KiB
Java
/*
|
|
* Copyright 2019 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 software.amazon.awssdk.services.kinesis.model.ChildShard;
|
|
import software.amazon.awssdk.utils.CollectionUtils;
|
|
|
|
import java.util.List;
|
|
|
|
public class DataRetrievalUtil {
|
|
|
|
public static boolean isValidResult(String shardEndIndicator, List<ChildShard> childShards) {
|
|
// shardEndIndicator is nextShardIterator for GetRecordsResponse, and is continuationSequenceNumber for SubscribeToShardEvent
|
|
// There are two valid scenarios for the shardEndIndicator and childShards combination.
|
|
// 1. ShardEnd scenario: shardEndIndicator should be null and childShards should be a non-empty list.
|
|
// 2. Non-ShardEnd scenario: shardEndIndicator should be non-null and childShards should be null or an empty list.
|
|
// Otherwise, the retrieval result is invalid.
|
|
if (shardEndIndicator == null && CollectionUtils.isNullOrEmpty(childShards) ||
|
|
shardEndIndicator != null && !CollectionUtils.isNullOrEmpty(childShards)) {
|
|
return false;
|
|
}
|
|
|
|
// For ShardEnd scenario, for each childShard we should validate if parentShards are available.
|
|
// Missing parentShards can cause issues with creating leases for childShards during ShardConsumer shutdown.
|
|
if (!CollectionUtils.isNullOrEmpty(childShards)) {
|
|
for (ChildShard childShard : childShards) {
|
|
if (CollectionUtils.isNullOrEmpty(childShard.parentShards())) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
}
|