org.webbitserver.helpers.NamedThreadFactory Maven / Gradle / Ivy
package org.webbitserver.helpers;
/*
* 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.
*/
// copied from Apache Lucene
// https://svn.apache.org/repos/asf/lucene/dev/trunk/lucene/core/src/java/org/apache/lucene/util/NamedThreadFactory.java
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;
/**
* A default {@link ThreadFactory} implementation that accepts the name prefix
* of the created threads as a constructor argument. Otherwise, this factory
* yields the same semantics as the thread factory returned by
* {@link Executors#defaultThreadFactory()}.
*/
public class NamedThreadFactory implements ThreadFactory {
private static final AtomicInteger threadPoolNumber = new AtomicInteger(1);
private final ThreadGroup group;
private final AtomicInteger threadNumber = new AtomicInteger(1);
private static final String NAME_PATTERN = "%s-%d-thread";
private final String threadNamePrefix;
/**
* Creates a new {@link NamedThreadFactory} instance
*
* @param threadNamePrefix the name prefix assigned to each thread created.
*/
public NamedThreadFactory(String threadNamePrefix) {
final SecurityManager s = System.getSecurityManager();
group = (s != null) ? s.getThreadGroup() : Thread.currentThread()
.getThreadGroup();
this.threadNamePrefix = String.format(NAME_PATTERN,
checkPrefix(threadNamePrefix), threadPoolNumber.getAndIncrement());
}
private static String checkPrefix(String prefix) {
return prefix == null || prefix.length() == 0 ? "Lucene" : prefix;
}
/**
* Creates a new {@link Thread}
*
* @see java.util.concurrent.ThreadFactory#newThread(java.lang.Runnable)
*/
public Thread newThread(Runnable r) {
final Thread t = new Thread(group, r, String.format("%s-%d",
this.threadNamePrefix, threadNumber.getAndIncrement()), 0);
t.setDaemon(true);
t.setPriority(Thread.NORM_PRIORITY);
return t;
}
}