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// Copyright 2016 The Bazel Authors. All rights reserved.
//
// Licensed 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 com.google.devtools.build.lib.concurrent;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.ForkJoinWorkerThread;
import java.util.concurrent.atomic.AtomicLong;
/** A {@link ForkJoinPool} with support for thread naming. */
public class NamedForkJoinPool extends ForkJoinPool {
protected NamedForkJoinPool(String name, int poolSize) {
super(
poolSize,
new NamedForkJoinWorkerThreadFactory(name + "-%s"),
/*getUncaughtExceptionHandler=*/ null,
/*asyncMode=*/ false);
}
public static NamedForkJoinPool newNamedPool(String name, int numThreads) {
return new NamedForkJoinPool(name, numThreads);
}
/** A {@link ForkJoinWorkerThread} named on construction. */
private static class NamedForkJoinWorkerThread extends ForkJoinWorkerThread {
public NamedForkJoinWorkerThread(ForkJoinPool forkJoinPool, String name) {
super(forkJoinPool);
this.setName(name);
}
}
/**
* A factory for {@link NamedForkJoinWorkerThread}s that names those threads using a
* client-provided name format that consumes a thread index.
*/
private static class NamedForkJoinWorkerThreadFactory implements ForkJoinWorkerThreadFactory {
private final String nameFormat;
private final AtomicLong nextUnusedThreadIndex = new AtomicLong(0L);
NamedForkJoinWorkerThreadFactory(String nameFormat) {
this.nameFormat = nameFormat;
}
@Override
public ForkJoinWorkerThread newThread(ForkJoinPool forkJoinPool) {
return new NamedForkJoinWorkerThread(
forkJoinPool, String.format(nameFormat, nextUnusedThreadIndex.getAndIncrement()));
}
}
}
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