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Scala example source code file (AbstractExecutorService.java)
The Scala AbstractExecutorService.java source code/* * 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/licenses/publicdomain */ package scala.actors.threadpool; import scala.actors.threadpool.helpers.*; import java.util.Collection; import java.util.ArrayList; import java.util.List; import java.util.Iterator; /** * Provides default implementations of {@link ExecutorService} * execution methods. This class implements the <tt>submit, * <tt>invokeAny and invokeAll methods using a * {@link RunnableFuture} returned by <tt>newTaskFor, which defaults * to the {@link FutureTask} class provided in this package. For example, * the implementation of <tt>submit(Runnable) creates an * associated <tt>RunnableFuture that is executed and * returned. Subclasses may override the <tt>newTaskFor methods * to return <tt>RunnableFuture implementations other than * <tt>FutureTask. * * <p> Extension example. Here is a sketch of a class * that customizes {@link ThreadPoolExecutor} to use * a <tt>CustomTask class instead of the default FutureTask: * <pre> * public class CustomThreadPoolExecutor extends ThreadPoolExecutor { * * static class CustomTask<V> implements RunnableFuture<V> {...} * * protected <V> RunnableFuture<V> newTaskFor(Callable<V> c) { * return new CustomTask<V>(c); * } * protected <V> RunnableFuture<V> newTaskFor(Runnable r, V v) { * return new CustomTask<V>(r, v); * } * // ... add constructors, etc. * } * </pre> * @since 1.5 * @author Doug Lea */ public abstract class AbstractExecutorService implements ExecutorService { /** * Returns a <tt>RunnableFuture for the given runnable and default * value. * * @param runnable the runnable task being wrapped * @param value the default value for the returned future * @return a <tt>RunnableFuture which when run will run the * underlying runnable and which, as a <tt>Future, will yield * the given value as its result and provide for cancellation of * the underlying task. * @since 1.6 */ protected RunnableFuture newTaskFor(Runnable runnable, Object value) { return new FutureTask(runnable, value); } /** * Returns a <tt>RunnableFuture for the given callable task. * * @param callable the callable task being wrapped * @return a <tt>RunnableFuture which when run will call the * underlying callable and which, as a <tt>Future, will yield * the callable's result as its result and provide for * cancellation of the underlying task. * @since 1.6 */ protected RunnableFuture newTaskFor(Callable callable) { return new FutureTask(callable); } /** * @throws RejectedExecutionException {@inheritDoc} * @throws NullPointerException {@inheritDoc} */ public Future submit(Runnable task) { if (task == null) throw new NullPointerException(); RunnableFuture ftask = newTaskFor(task, null); execute(ftask); return ftask; } /** * @throws RejectedExecutionException {@inheritDoc} * @throws NullPointerException {@inheritDoc} */ public Future submit(Runnable task, Object result) { if (task == null) throw new NullPointerException(); RunnableFuture ftask = newTaskFor(task, result); execute(ftask); return ftask; } /** * @throws RejectedExecutionException {@inheritDoc} * @throws NullPointerException {@inheritDoc} */ public Future submit(Callable task) { if (task == null) throw new NullPointerException(); RunnableFuture ftask = newTaskFor(task); execute(ftask); return ftask; } /** * the main mechanics of invokeAny. */ private Object doInvokeAny(Collection tasks, boolean timed, long nanos) throws InterruptedException, ExecutionException, TimeoutException { if (tasks == null) throw new NullPointerException(); int ntasks = tasks.size(); if (ntasks == 0) throw new IllegalArgumentException(); List<Future> futures = new ArrayList Other Scala examples (source code examples)Here is a short list of links related to this Scala AbstractExecutorService.java source code file: |
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