org.apache.flink.runtime.iterative.io.WorksetUpdateOutputCollector Maven / Gradle / Ivy
/*
* 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.runtime.iterative.io;
import java.io.IOException;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.core.memory.DataOutputView;
import org.apache.flink.util.Collector;
/**
* A {@link Collector} to update the iteration workset (partial solution for bulk iterations).
*
* The records are written to a {@link DataOutputView} to allow in-memory data exchange.
*/
public class WorksetUpdateOutputCollector implements Collector {
private final TypeSerializer serializer;
private final DataOutputView outputView;
private long elementsCollected;
private Collector delegate;
public WorksetUpdateOutputCollector(DataOutputView outputView, TypeSerializer serializer) {
this(outputView, serializer, null);
}
public WorksetUpdateOutputCollector(DataOutputView outputView, TypeSerializer serializer, Collector delegate) {
this.outputView = outputView;
this.serializer = serializer;
this.delegate = delegate;
this.elementsCollected = 0;
}
@Override
public void collect(T record) {
try {
this.serializer.serialize(record, this.outputView);
if (delegate != null) {
delegate.collect(record);
}
this.elementsCollected++;
} catch (IOException e) {
throw new RuntimeException("Unable to serialize the record", e);
}
}
public long getElementsCollectedAndReset() {
long elementsCollectedToReturn = elementsCollected;
elementsCollected = 0;
return elementsCollectedToReturn;
}
@Override
public void close() {
if (delegate != null) {
delegate.close();
}
}
}