| /* |
| * 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.cassandra.concurrent; |
| |
| import java.util.concurrent.ThreadFactory; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import io.netty.util.concurrent.FastThreadLocal; |
| import io.netty.util.concurrent.FastThreadLocalThread; |
| |
| /** |
| * This class is an implementation of the <i>ThreadFactory</i> interface. This |
| * is useful to give Java threads meaningful names which is useful when using |
| * a tool like JConsole. |
| */ |
| |
| public class NamedThreadFactory implements ThreadFactory |
| { |
| public final String id; |
| private final int priority; |
| private final ClassLoader contextClassLoader; |
| private final ThreadGroup threadGroup; |
| protected final AtomicInteger n = new AtomicInteger(1); |
| |
| public NamedThreadFactory(String id) |
| { |
| this(id, Thread.NORM_PRIORITY); |
| } |
| |
| public NamedThreadFactory(String id, int priority) |
| { |
| this(id, priority, null, null); |
| } |
| |
| public NamedThreadFactory(String id, int priority, ClassLoader contextClassLoader, ThreadGroup threadGroup) |
| { |
| this.id = id; |
| this.priority = priority; |
| this.contextClassLoader = contextClassLoader; |
| this.threadGroup = threadGroup; |
| } |
| |
| public Thread newThread(Runnable runnable) |
| { |
| String name = id + ':' + n.getAndIncrement(); |
| Thread thread = new FastThreadLocalThread(threadGroup, threadLocalDeallocator(runnable), name); |
| thread.setPriority(priority); |
| thread.setDaemon(true); |
| if (contextClassLoader != null) |
| thread.setContextClassLoader(contextClassLoader); |
| return thread; |
| } |
| |
| /** |
| * Ensures that {@link FastThreadLocal#remove() FastThreadLocal.remove()} is called when the {@link Runnable#run()} |
| * method of the given {@link Runnable} instance completes to ensure cleanup of {@link FastThreadLocal} instances. |
| * This is especially important for direct byte buffers allocated locally for a thread. |
| */ |
| public static Runnable threadLocalDeallocator(Runnable r) |
| { |
| return () -> |
| { |
| try { |
| r.run(); |
| } finally { |
| FastThreadLocal.removeAll(); |
| } |
| }; |
| } |
| } |