| /* |
| * 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.drill.exec.rpc; |
| |
| import java.util.concurrent.ThreadFactory; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| /** |
| * {@link ThreadFactory} for {@link java.util.concurrent.ExecutorService}s that names threads sequentially. |
| * Creates Threads named with the prefix specified at construction time. Created threads |
| * have the daemon bit set and priority Thread.MAX_PRIORITY. |
| * |
| * <p>An instance creates names with an instance-specific prefix suffixed with sequential |
| * integers.</p> |
| * |
| * <p>Concurrency: See {@link #newThread}.</p> |
| */ |
| public class NamedThreadFactory implements ThreadFactory { |
| private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(NamedThreadFactory.class); |
| private final AtomicInteger nextId = new AtomicInteger(); // used to generate unique ids |
| private final String prefix; |
| |
| /** |
| * Constructor. |
| * |
| * @param prefix the string prefix that will be used to name threads created by this factory |
| */ |
| public NamedThreadFactory(final String prefix) { |
| this.prefix = prefix; |
| } |
| |
| /** |
| * Creates a sequentially named thread running a given Runnable. |
| * <p> |
| * The thread's name will be this instance's prefix concatenated with |
| * this instance's next<sup><a href="#fn-1">*</a></sup> sequential integer. |
| * </p> |
| * <p> |
| * Concurrency: Thread-safe. |
| * </p> |
| * <p> |
| * (Concurrent calls get different numbers. |
| * Calls started after other calls complete get later/higher numbers than |
| * those other calls. |
| * </p> |
| * <p> |
| * <a name="fn-1" />*However, for concurrent calls, the order of numbers |
| * is not defined.) |
| */ |
| @Override |
| public Thread newThread(final Runnable runnable) { |
| final Thread thread = new Thread(runnable, prefix + nextId.incrementAndGet()); |
| thread.setDaemon(true); |
| |
| try { |
| if (thread.getPriority() != Thread.MAX_PRIORITY) { |
| thread.setPriority(Thread.MAX_PRIORITY); |
| } |
| } catch (Exception ignored) { |
| // Doesn't matter even if failed to set. |
| logger.info("ignored exception " + ignored); |
| } |
| return thread; |
| } |
| } |