78 lines
2.9 KiB
Java
78 lines
2.9 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.warp.commonutils.type;
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import java.util.Locale;
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import java.util.concurrent.Executors;
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import java.util.concurrent.ThreadFactory;
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import java.util.concurrent.atomic.AtomicInteger;
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import org.jetbrains.annotations.NotNull;
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/**
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* A default {@link ThreadFactory} implementation that accepts the name prefix
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* of the created threads as a constructor argument. Otherwise, this factory
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* yields the same semantics as the thread factory returned by
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* {@link Executors#defaultThreadFactory()}.
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*/
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public class ShortNamedThreadFactory implements ThreadFactory {
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private static int POOL_NUMBERS_COUNT = 50;
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private static final AtomicInteger[] threadPoolNumber = new AtomicInteger[POOL_NUMBERS_COUNT];
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static {
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for (int i = 0; i < threadPoolNumber.length; i++) {
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threadPoolNumber[i] = new AtomicInteger(1);
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}
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}
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private final ThreadGroup group;
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private final AtomicInteger threadNumber = new AtomicInteger(1);
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private static final String NAME_PATTERN = "%s-%d";
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private final String threadNamePrefix;
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/**
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* Creates a new {@link ShortNamedThreadFactory} instance
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*
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* @param threadNamePrefix the name prefix assigned to each thread created.
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*/
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public ShortNamedThreadFactory(String threadNamePrefix) {
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final SecurityManager s = System.getSecurityManager();
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group = (s != null) ? s.getThreadGroup() : Thread.currentThread()
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.getThreadGroup();
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this.threadNamePrefix = String.format(Locale.ROOT, NAME_PATTERN,
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checkPrefix(threadNamePrefix), threadPoolNumber[(threadNamePrefix.hashCode() % POOL_NUMBERS_COUNT / 2) + POOL_NUMBERS_COUNT / 2].getAndIncrement());
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}
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private static String checkPrefix(String prefix) {
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return prefix == null || prefix.length() == 0 ? "Unnamed" : prefix;
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}
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/**
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* Creates a new {@link Thread}
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*
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* @see java.util.concurrent.ThreadFactory#newThread(java.lang.Runnable)
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*/
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@Override
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public Thread newThread(@NotNull Runnable r) {
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final Thread t = new Thread(group, r, String.format(Locale.ROOT, "%s-%d",
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this.threadNamePrefix, threadNumber.getAndIncrement()), 0);
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t.setDaemon(false);
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t.setPriority(Thread.NORM_PRIORITY);
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return t;
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}
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}
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