| /* |
| * 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.eclipse.aether.util.concurrency; |
| |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.ThreadFactory; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| /** |
| * A factory to create worker threads with a given name prefix. |
| */ |
| public final class WorkerThreadFactory |
| implements ThreadFactory |
| { |
| |
| private final ThreadFactory factory; |
| |
| private final String namePrefix; |
| |
| private final AtomicInteger threadIndex; |
| |
| private static final AtomicInteger poolIndex = new AtomicInteger(); |
| |
| /** |
| * Creates a new thread factory whose threads will have names using the specified prefix. |
| * |
| * @param namePrefix The prefix for the thread names, may be {@code null} or empty to derive the prefix from the |
| * caller's simple class name. |
| */ |
| public WorkerThreadFactory( String namePrefix ) |
| { |
| this.factory = Executors.defaultThreadFactory(); |
| this.namePrefix = |
| ( ( namePrefix != null && namePrefix.length() > 0 ) ? namePrefix : getCallerSimpleClassName() + '-' ) |
| + poolIndex.getAndIncrement() + '-'; |
| threadIndex = new AtomicInteger(); |
| } |
| |
| private static String getCallerSimpleClassName() |
| { |
| StackTraceElement[] stack = new Exception().getStackTrace(); |
| if ( stack == null || stack.length <= 2 ) |
| { |
| return "Worker-"; |
| } |
| String name = stack[2].getClassName(); |
| name = name.substring( name.lastIndexOf( '.' ) + 1 ); |
| return name; |
| } |
| |
| public Thread newThread( Runnable r ) |
| { |
| Thread thread = factory.newThread( r ); |
| thread.setName( namePrefix + threadIndex.getAndIncrement() ); |
| thread.setDaemon( true ); |
| return thread; |
| } |
| |
| } |