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/**
 * Copyright [2009-2010] [dennis zhuang([email protected])] 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
 */
/**
 * Copyright [2009-2010] [dennis zhuang([email protected])] 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.code.yanf4j.util;

import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * Thread factory for worker thread
 * 
 * @author dennis
 * 
 */
public class WorkerThreadFactory implements ThreadFactory {
  private static final AtomicInteger poolNumber = new AtomicInteger(1);
  private final ThreadGroup group;
  private final AtomicInteger threadNumber = new AtomicInteger(1);
  private final String namePrefix;

  public WorkerThreadFactory(ThreadGroup group, String prefix) {
    if (group == null) {
      SecurityManager s = System.getSecurityManager();
      this.group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
    } else {
      this.group = group;
    }
    if (prefix == null) {
      this.namePrefix = "pool-" + poolNumber.getAndIncrement() + "-thread-";
    } else {
      this.namePrefix = prefix + "-" + poolNumber.getAndIncrement() + "-thread-";
    }
  }

  public WorkerThreadFactory(String prefix) {
    this(null, prefix);
  }

  public WorkerThreadFactory() {
    this(null, null);
  }

  public Thread newThread(Runnable r) {
    Thread t = new Thread(this.group, r, this.namePrefix + this.threadNumber.getAndIncrement(), 0);
    t.setDaemon(true);
    if (t.getPriority() != Thread.NORM_PRIORITY) {
      t.setPriority(Thread.NORM_PRIORITY);
    }
    return t;
  }

}