001/*
002 * ModeShape (http://www.modeshape.org)
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *       http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.modeshape.common.util;
017
018import java.util.concurrent.Executors;
019import java.util.concurrent.ThreadFactory;
020import java.util.concurrent.atomic.AtomicInteger;
021
022/**
023 * The thread factory that lets us adjust the names of the threads.
024 * 
025 * @see Executors#defaultThreadFactory()
026 */
027public class NamedThreadFactory implements ThreadFactory {
028    static final AtomicInteger poolNumber = new AtomicInteger(1);
029    final ThreadGroup group;
030    final AtomicInteger threadNumber = new AtomicInteger(1);
031    final String namePrefix;
032
033    public NamedThreadFactory( String poolName ) {
034        SecurityManager s = System.getSecurityManager();
035        group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
036        namePrefix = (poolName != null && poolName.trim().length() != 0 ? poolName : "pool") + "-" + poolNumber.getAndIncrement()
037                     + "-thread-";
038    }
039
040    @Override
041    public Thread newThread( Runnable r ) {
042        Thread t = new Thread(group, r, namePrefix + threadNumber.getAndIncrement(), 0);
043        if (t.isDaemon()) t.setDaemon(false);
044        if (t.getPriority() != Thread.NORM_PRIORITY) t.setPriority(Thread.NORM_PRIORITY);
045        return t;
046    }
047}