org.apache.flink.runtime.iterative.io.SolutionSetFastUpdateOutputCollector Maven / Gradle / Ivy
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* 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,
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*/
package org.apache.flink.runtime.iterative.io;
import org.apache.flink.runtime.operators.hash.CompactingHashTable;
import org.apache.flink.util.Collector;
import java.io.IOException;
/**
* A {@link Collector} to update the solution set of a workset iteration.
*
* The records are written to a hash table to allow in-memory point updates.
*
*
Assumption for fast updates: the build side iterator of the hash table is already positioned for the update. This
* is for example the case when a solution set update happens directly after a solution set join. If this assumption
* doesn't hold, use {@link SolutionSetUpdateOutputCollector}, which probes the hash table before updating.
*/
public class SolutionSetFastUpdateOutputCollector implements Collector {
private final Collector delegate;
private final CompactingHashTable solutionSet;
public SolutionSetFastUpdateOutputCollector(CompactingHashTable solutionSet) {
this(solutionSet, null);
}
public SolutionSetFastUpdateOutputCollector(CompactingHashTable solutionSet, Collector delegate) {
this.solutionSet = solutionSet;
this.delegate = delegate;
}
@Override
public void collect(T record) {
try {
solutionSet.insertOrReplaceRecord(record);
if (delegate != null) {
delegate.collect(record);
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
public void close() {
if (delegate != null) {
delegate.close();
}
}
}