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/*
 * 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.apache.solr.common.util;

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

/** A {@link ThreadFactory} that names threads with the given prefix. */
public class SolrNamedThreadFactory implements ThreadFactory {
  private static final AtomicInteger poolNumber = new AtomicInteger(1);
  private final ThreadGroup group;
  private final AtomicInteger threadNumber = new AtomicInteger(1);
  private final String prefix;

  public SolrNamedThreadFactory(String namePrefix) {
    SecurityManager s = System.getSecurityManager();
    group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
    prefix = namePrefix + "-" + poolNumber.getAndIncrement() + "-thread-";
  }

  @Override
  public Thread newThread(Runnable r) {
    Thread t = new Thread(group, r, prefix + threadNumber.getAndIncrement(), 0);

    t.setDaemon(false);

    if (t.getPriority() != Thread.NORM_PRIORITY) t.setPriority(Thread.NORM_PRIORITY);
    return t;
  }
}