org.apache.flink.streaming.api.operators.collect.CollectCoordinationResponse Maven / Gradle / Ivy
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* 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.streaming.api.operators.collect;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.api.common.typeutils.base.ListSerializer;
import org.apache.flink.api.common.typeutils.base.LongSerializer;
import org.apache.flink.api.common.typeutils.base.StringSerializer;
import org.apache.flink.api.common.typeutils.base.array.BytePrimitiveArraySerializer;
import org.apache.flink.core.memory.DataInputView;
import org.apache.flink.core.memory.DataInputViewStreamWrapper;
import org.apache.flink.core.memory.DataOutputView;
import org.apache.flink.runtime.operators.coordination.CoordinationResponse;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* A {@link CoordinationResponse} from the coordinator containing the required batch or new results
* and other necessary information in serialized form.
*
* For an explanation of this communication protocol, see Java docs in {@link
* CollectSinkFunction}.
*/
public class CollectCoordinationResponse implements CoordinationResponse {
private static final long serialVersionUID = 1L;
private static final TypeSerializer versionSerializer = StringSerializer.INSTANCE;
private static final TypeSerializer offsetSerializer = LongSerializer.INSTANCE;
private static final ListSerializer bufferSerializer =
new ListSerializer<>(BytePrimitiveArraySerializer.INSTANCE);
private final String version;
private final long lastCheckpointedOffset;
private final List serializedResults;
public CollectCoordinationResponse(
String version, long lastCheckpointedOffset, List serializedResults) {
this.version = version;
this.lastCheckpointedOffset = lastCheckpointedOffset;
this.serializedResults = serializedResults;
}
public CollectCoordinationResponse(DataInputView inView) throws IOException {
this.version = versionSerializer.deserialize(inView);
this.lastCheckpointedOffset = offsetSerializer.deserialize(inView);
this.serializedResults = bufferSerializer.deserialize(inView);
}
public String getVersion() {
return version;
}
public long getLastCheckpointedOffset() {
return lastCheckpointedOffset;
}
// TODO the following two methods might be not so efficient
// optimize them with MemorySegment if needed
public List getResults(TypeSerializer elementSerializer) throws IOException {
List results = new ArrayList<>();
for (byte[] serializedResult : serializedResults) {
ByteArrayInputStream bais = new ByteArrayInputStream(serializedResult);
DataInputViewStreamWrapper wrapper = new DataInputViewStreamWrapper(bais);
results.add(elementSerializer.deserialize(wrapper));
}
return results;
}
public void serialize(DataOutputView outView) throws IOException {
versionSerializer.serialize(version, outView);
offsetSerializer.serialize(lastCheckpointedOffset, outView);
bufferSerializer.serialize(serializedResults, outView);
}
}