| package org.apache.lucene.util; |
| |
| /* |
| * 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. |
| */ |
| |
| import java.util.Locale; |
| 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(Locale.ROOT, 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) |
| */ |
| @Override |
| public Thread newThread(Runnable r) { |
| final Thread t = new Thread(group, r, String.format(Locale.ROOT, "%s-%d", |
| this.threadNamePrefix, threadNumber.getAndIncrement()), 0); |
| t.setDaemon(false); |
| t.setPriority(Thread.NORM_PRIORITY); |
| return t; |
| } |
| |
| } |