gguptp commented on code in PR #146: URL: https://github.com/apache/flink-connector-aws/pull/146#discussion_r1670727649
########## flink-connector-aws/flink-connector-dynamodb/src/test/java/org/apache/flink/connector/dynamodb/source/util/DynamoDbStreamsClientProvider.java: ########## @@ -0,0 +1,193 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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 org.apache.flink.connector.dynamodb.source.util; + +import software.amazon.awssdk.awscore.exception.AwsServiceException; +import software.amazon.awssdk.core.exception.SdkClientException; +import software.amazon.awssdk.services.dynamodb.model.DescribeStreamRequest; +import software.amazon.awssdk.services.dynamodb.model.DescribeStreamResponse; +import software.amazon.awssdk.services.dynamodb.model.GetRecordsRequest; +import software.amazon.awssdk.services.dynamodb.model.GetRecordsResponse; +import software.amazon.awssdk.services.dynamodb.model.GetShardIteratorRequest; +import software.amazon.awssdk.services.dynamodb.model.GetShardIteratorResponse; +import software.amazon.awssdk.services.dynamodb.model.Shard; +import software.amazon.awssdk.services.dynamodb.model.StreamDescription; +import software.amazon.awssdk.services.dynamodb.model.StreamStatus; +import software.amazon.awssdk.services.dynamodb.streams.DynamoDbStreamsClient; +import software.amazon.awssdk.services.dynamodb.streams.DynamoDbStreamsServiceClientConfiguration; + +import java.util.ArrayDeque; +import java.util.Deque; +import java.util.List; +import java.util.function.Consumer; + +/** Provides {@link DynamoDbStreamsClient} with mocked DynamoDbStreams behavior. */ +public class DynamoDbStreamsClientProvider { + + /** + * An implementation of the {@link DynamoDbStreamsClient} that allows control over DynamoDb + * Service responses. + */ + public static class TestingDynamoDbStreamsClient implements DynamoDbStreamsClient { + + private Deque<DescribeStreamItem> describeStreamItems = new ArrayDeque<>(); + private Deque<String> shardIterators = new ArrayDeque<>(); + private Consumer<GetShardIteratorRequest> getShardIteratorValidation; + private GetRecordsResponse getRecordsResponse; + private Consumer<GetRecordsRequest> getRecordsValidation; + private boolean closed = false; + + @Override + public String serviceName() { + return "dynamodb"; + } + + @Override + public void close() { + closed = true; + } + + public boolean isClosed() { + return closed; + } + + public void setNextShardIterator(String shardIterator) { + this.shardIterators.add(shardIterator); + } + + public void setShardIteratorValidation(Consumer<GetShardIteratorRequest> validation) { + this.getShardIteratorValidation = validation; + } + + @Override + public GetShardIteratorResponse getShardIterator( + GetShardIteratorRequest getShardIteratorRequest) + throws AwsServiceException, SdkClientException { + getShardIteratorValidation.accept(getShardIteratorRequest); + return GetShardIteratorResponse.builder().shardIterator(shardIterators.poll()).build(); + } + + public void setDescribeStreamResponse(List<DescribeStreamItem> items) { + describeStreamItems.addAll(items); + } + + @Override + public DescribeStreamResponse describeStream(DescribeStreamRequest describeStreamRequest) + throws AwsServiceException, SdkClientException { + + DescribeStreamItem item = describeStreamItems.pop(); + + item.validation.accept(describeStreamRequest); + return DescribeStreamResponse.builder() + .streamDescription( + StreamDescription.builder() + .shards(item.shards) + .streamStatus(item.streamStatus) + .streamArn(item.streamArn) + .build()) + .build(); + } + + public void setGetRecordsResponse(GetRecordsResponse getRecordsResponse) { + this.getRecordsResponse = getRecordsResponse; + } + + public void setGetRecordsValidation(Consumer<GetRecordsRequest> validation) { + this.getRecordsValidation = validation; + } + + @Override + public GetRecordsResponse getRecords(GetRecordsRequest getRecordsRequest) + throws AwsServiceException, SdkClientException { + getRecordsValidation.accept(getRecordsRequest); + return getRecordsResponse; + } + + @Override + public DynamoDbStreamsServiceClientConfiguration serviceClientConfiguration() { + // This is not used + return null; + } + } + + /** Data class to provide a mocked response to ListShards() calls. */ + public static class DescribeStreamItem { + private final Consumer<DescribeStreamRequest> validation; + private final List<Shard> shards; + private final String nextToken; + private final StreamStatus streamStatus; + private final String streamArn; + + private DescribeStreamItem( + Consumer<DescribeStreamRequest> validation, + List<Shard> shards, + String nextToken, + StreamStatus streamStatus, + String streamArn) { + this.validation = validation; + this.shards = shards; + this.nextToken = nextToken; + this.streamStatus = streamStatus; + this.streamArn = streamArn; + } + + public static Builder builder() { + return new Builder(); + } + + /** Builder for {@link DescribeStreamItem}. */ + public static class Builder { + private Consumer<DescribeStreamRequest> validation; + private List<Shard> shards; + private String nextToken; Review Comment: We can. 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