flink-connectors/flink-connector-base/src/test/java/org/apache/flink/connector/base/sink/ArrayListAsyncSink.java

/*
 * 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.base.sink;

import org.apache.flink.api.connector.sink.SinkWriter;
import org.apache.flink.connector.base.sink.writer.AsyncSinkWriter;
import org.apache.flink.core.io.SimpleVersionedSerializer;

import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Optional;
import java.util.function.Consumer;

/** Dummy destination that records write events. */
public class ArrayListAsyncSink extends AsyncSinkBase<String, Integer> {

    private final int maxBatchSize;
    private final int maxInFlightRequests;
    private final int maxBufferedRequests;
    private final long flushOnBufferSizeInBytes;
    private final long maxTimeInBufferMS;

    public ArrayListAsyncSink() {
        this(25, 1, 100, 100000, 1000);
    }

    public ArrayListAsyncSink(
            int maxBatchSize,
            int maxInFlightRequests,
            int maxBufferedRequests,
            long flushOnBufferSizeInBytes,
            long maxTimeInBufferMS) {
        this.maxBatchSize = maxBatchSize;
        this.maxInFlightRequests = maxInFlightRequests;
        this.maxBufferedRequests = maxBufferedRequests;
        this.flushOnBufferSizeInBytes = flushOnBufferSizeInBytes;
        this.maxTimeInBufferMS = maxTimeInBufferMS;
    }

    @Override
    public SinkWriter<String, Void, Collection<Integer>> createWriter(
            InitContext context, List<Collection<Integer>> states) {
        /* SinkWriter implementing {@code submitRequestEntries} that is used to define the persistence
         * logic into {@code ArrayListDestination}.
         */
        return new AsyncSinkWriter<String, Integer>(
                (element, x) -> Integer.parseInt(element),
                context,
                maxBatchSize,
                maxInFlightRequests,
                maxBufferedRequests,
                flushOnBufferSizeInBytes,
                maxTimeInBufferMS) {

            @Override
            protected void submitRequestEntries(
                    List<Integer> requestEntries, Consumer<Collection<Integer>> requestResult) {
                ArrayListDestination.putRecords(requestEntries);
                requestResult.accept(Arrays.asList());
            }

            @Override
            protected long getSizeInBytes(Integer requestEntry) {
                return 4;
            }
        };
    }

    @Override
    public Optional<SimpleVersionedSerializer<Collection<Integer>>> getWriterStateSerializer() {
        return Optional.empty();
    }
}