org.apache.flink.streaming.api.collector.selector.CopyingDirectedOutput 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.streaming.api.collector.selector;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.streaming.api.graph.StreamEdge;
import org.apache.flink.streaming.api.operators.Output;
import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
/**
* Special version of {@link DirectedOutput} that performs a shallow copy of the
* {@link StreamRecord} to ensure that multi-chaining works correctly.
*/
public class CopyingDirectedOutput extends DirectedOutput {
@SuppressWarnings({"unchecked", "rawtypes"})
public CopyingDirectedOutput(
List> outputSelectors,
List>, StreamEdge>> outputs) {
super(outputSelectors, outputs);
}
@Override
public void collect(StreamRecord record) {
Set>> selectedOutputs = selectOutputs(record);
if (selectedOutputs.isEmpty()) {
return;
}
Iterator>> it = selectedOutputs.iterator();
while (true) {
Output> out = it.next();
if (it.hasNext()) {
// we don't have the last output
// perform a shallow copy
StreamRecord shallowCopy = record.copy(record.getValue());
out.collect(shallowCopy);
} else {
// this is the last output
out.collect(record);
break;
}
}
}
}