org.apache.flink.runtime.operators.sort.DefaultSpillingBehaviour 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.runtime.operators.sort;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.runtime.io.disk.iomanager.ChannelWriterOutputView;
import java.io.IOException;
/**
* A {@link SpillingThread.SpillingBehaviour} which spills or merges given elements directly.
*
* @see CombiningSpillingBehaviour
*/
final class DefaultSpillingBehaviour implements SpillingThread.SpillingBehaviour {
private final boolean objectReuseEnabled;
private final TypeSerializer serializer;
DefaultSpillingBehaviour(boolean objectReuseEnabled, TypeSerializer serializer) {
this.objectReuseEnabled = objectReuseEnabled;
this.serializer = serializer;
}
@Override
public void spillBuffer(
CircularElement element,
ChannelWriterOutputView output,
LargeRecordHandler largeRecordHandler)
throws IOException {
element.getBuffer().writeToOutput(output, largeRecordHandler);
}
@Override
public void mergeRecords(MergeIterator mergeIterator, ChannelWriterOutputView output)
throws IOException {
// read the merged stream and write the data back
if (objectReuseEnabled) {
R rec = serializer.createInstance();
while ((rec = mergeIterator.next(rec)) != null) {
serializer.serialize(rec, output);
}
} else {
R rec;
while ((rec = mergeIterator.next()) != null) {
serializer.serialize(rec, output);
}
}
}
}