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Java example source code file (CompletionService.java)
The CompletionService.java Java example source code/* * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /* * This file is available under and governed by the GNU General Public * License version 2 only, as published by the Free Software Foundation. * However, the following notice accompanied the original version of this * file: * * Written by Doug Lea with assistance from members of JCP JSR-166 * Expert Group and released to the public domain, as explained at * http://creativecommons.org/publicdomain/zero/1.0/ */ package java.util.concurrent; /** * A service that decouples the production of new asynchronous tasks * from the consumption of the results of completed tasks. Producers * {@code submit} tasks for execution. Consumers {@code take} * completed tasks and process their results in the order they * complete. A {@code CompletionService} can for example be used to * manage asynchronous I/O, in which tasks that perform reads are * submitted in one part of a program or system, and then acted upon * in a different part of the program when the reads complete, * possibly in a different order than they were requested. * * <p>Typically, a {@code CompletionService} relies on a separate * {@link Executor} to actually execute the tasks, in which case the * {@code CompletionService} only manages an internal completion * queue. The {@link ExecutorCompletionService} class provides an * implementation of this approach. * * <p>Memory consistency effects: Actions in a thread prior to * submitting a task to a {@code CompletionService} * <a href="package-summary.html#MemoryVisibility">happen-before * actions taken by that task, which in turn <i>happen-before * actions following a successful return from the corresponding {@code take()}. */ public interface CompletionService<V> { /** * Submits a value-returning task for execution and returns a Future * representing the pending results of the task. Upon completion, * this task may be taken or polled. * * @param task the task to submit * @return a Future representing pending completion of the task * @throws RejectedExecutionException if the task cannot be * scheduled for execution * @throws NullPointerException if the task is null */ Future<V> submit(Callable Other Java examples (source code examples)Here is a short list of links related to this Java CompletionService.java source code file: |
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