org.eclipse.aether.util.concurrency.WorkerThreadFactory 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.eclipse.aether.util.concurrency;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;
/**
* A factory to create worker threads with a given name prefix.
*/
public final class WorkerThreadFactory implements ThreadFactory {
private final ThreadFactory factory;
private final String namePrefix;
private final AtomicInteger threadIndex;
private static final AtomicInteger POOL_INDEX = new AtomicInteger();
/**
* Creates a new thread factory whose threads will have names using the specified prefix.
*
* @param namePrefix The prefix for the thread names, may be {@code null} or empty to derive the prefix from the
* caller's simple class name.
*/
public WorkerThreadFactory(String namePrefix) {
this.factory = Executors.defaultThreadFactory();
this.namePrefix =
((namePrefix != null && namePrefix.length() > 0) ? namePrefix : getCallerSimpleClassName() + '-')
+ POOL_INDEX.getAndIncrement()
+ '-';
threadIndex = new AtomicInteger();
}
private static String getCallerSimpleClassName() {
StackTraceElement[] stack = new Exception().getStackTrace();
if (stack == null || stack.length <= 2) {
return "Worker-";
}
String name = stack[2].getClassName();
name = name.substring(name.lastIndexOf('.') + 1);
return name;
}
public Thread newThread(Runnable r) {
Thread thread = factory.newThread(r);
thread.setName(namePrefix + threadIndex.getAndIncrement());
thread.setDaemon(true);
return thread;
}
}