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diff --git a/src/actors/scala/actors/threadpool/AbstractExecutorService.java b/src/actors/scala/actors/threadpool/AbstractExecutorService.java
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-/*
- * 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>,
- * <tt>invokeAny</tt> and <tt>invokeAll</tt> methods using a
- * {@link RunnableFuture} returned by <tt>newTaskFor</tt>, which defaults
- * to the {@link FutureTask} class provided in this package. For example,
- * the implementation of <tt>submit(Runnable)</tt> creates an
- * associated <tt>RunnableFuture</tt> that is executed and
- * returned. Subclasses may override the <tt>newTaskFor</tt> methods
- * to return <tt>RunnableFuture</tt> implementations other than
- * <tt>FutureTask</tt>.
- *
- * <p> <b>Extension example</b>. Here is a sketch of a class
- * that customizes {@link ThreadPoolExecutor} to use
- * a <tt>CustomTask</tt> class instead of the default <tt>FutureTask</tt>:
- * <pre>
- * public class CustomThreadPoolExecutor extends ThreadPoolExecutor {
- *
- * static class CustomTask&lt;V&gt; implements RunnableFuture&lt;V&gt; {...}
- *
- * protected &lt;V&gt; RunnableFuture&lt;V&gt; newTaskFor(Callable&lt;V&gt; c) {
- * return new CustomTask&lt;V&gt;(c);
- * }
- * protected &lt;V&gt; RunnableFuture&lt;V&gt; newTaskFor(Runnable r, V v) {
- * return new CustomTask&lt;V&gt;(r, v);
- * }
- * // ... add constructors, etc.
- * }
- * </pre>
- * @since 1.5
- * @author Doug Lea
- */
-public abstract class AbstractExecutorService implements ExecutorService {
-
- /**
- * Returns a <tt>RunnableFuture</tt> 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</tt> which when run will run the
- * underlying runnable and which, as a <tt>Future</tt>, 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</tt> for the given callable task.
- *
- * @param callable the callable task being wrapped
- * @return a <tt>RunnableFuture</tt> which when run will call the
- * underlying callable and which, as a <tt>Future</tt>, 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<Future>(ntasks);
- ExecutorCompletionService ecs =
- new ExecutorCompletionService(this);
-
- // For efficiency, especially in executors with limited
- // parallelism, check to see if previously submitted tasks are
- // done before submitting more of them. This interleaving
- // plus the exception mechanics account for messiness of main
- // loop.
-
- try {
- // Record exceptions so that if we fail to obtain any
- // result, we can throw the last exception we got.
- ExecutionException ee = null;
- long lastTime = (timed)? Utils.nanoTime() : 0;
- Iterator it = tasks.iterator();
-
- // Start one task for sure; the rest incrementally
- futures.add(ecs.submit((Callable)it.next()));
- --ntasks;
- int active = 1;
-
- for (;;) {
- Future f = ecs.poll();
- if (f == null) {
- if (ntasks > 0) {
- --ntasks;
- futures.add(ecs.submit((Callable)it.next()));
- ++active;
- }
- else if (active == 0)
- break;
- else if (timed) {
- f = ecs.poll(nanos, TimeUnit.NANOSECONDS);
- if (f == null)
- throw new TimeoutException();
- long now = Utils.nanoTime();
- nanos -= now - lastTime;
- lastTime = now;
- }
- else
- f = ecs.take();
- }
- if (f != null) {
- --active;
- try {
- return f.get();
- } catch (InterruptedException ie) {
- throw ie;
- } catch (ExecutionException eex) {
- ee = eex;
- } catch (RuntimeException rex) {
- ee = new ExecutionException(rex);
- }
- }
- }
-
- if (ee == null)
- ee = new ExecutionException();
- throw ee;
-
- } finally {
- for (Iterator f = futures.iterator(); f.hasNext();)
- ((Future)f.next()).cancel(true);
- }
- }
-
- public Object invokeAny(Collection tasks)
- throws InterruptedException, ExecutionException {
- try {
- return doInvokeAny(tasks, false, 0);
- } catch (TimeoutException cannotHappen) {
- assert false;
- return null;
- }
- }
-
- public Object invokeAny(Collection tasks,
- long timeout, TimeUnit unit)
- throws InterruptedException, ExecutionException, TimeoutException {
- return doInvokeAny(tasks, true, unit.toNanos(timeout));
- }
-
- public List<Future> invokeAll(Collection tasks) throws InterruptedException {
- if (tasks == null)
- throw new NullPointerException();
- List<Future> futures = new ArrayList<Future>(tasks.size());
- boolean done = false;
- try {
- for (Iterator t = tasks.iterator(); t.hasNext();) {
- RunnableFuture f = newTaskFor((Callable)t.next());
- futures.add(f);
- execute(f);
- }
- for (Iterator i = futures.iterator(); i.hasNext();) {
- Future f = (Future) i.next();
- if (!f.isDone()) {
- try {
- f.get();
- } catch (CancellationException ignore) {
- } catch (ExecutionException ignore) {
- }
- }
- }
- done = true;
- return futures;
- } finally {
- if (!done)
- for (Iterator i = futures.iterator(); i.hasNext();) {
- Future f = (Future) i.next();
- f.cancel(true);
- }
- }
- }
-
- public List<Future> invokeAll(Collection tasks,
- long timeout, TimeUnit unit)
- throws InterruptedException {
- if (tasks == null || unit == null)
- throw new NullPointerException();
- long nanos = unit.toNanos(timeout);
- List<Future> futures = new ArrayList<Future>(tasks.size());
- boolean done = false;
- try {
- for (Iterator t = tasks.iterator(); t.hasNext();)
- futures.add(newTaskFor((Callable)t.next()));
-
- long lastTime = Utils.nanoTime();
-
- // Interleave time checks and calls to execute in case
- // executor doesn't have any/much parallelism.
- Iterator it = futures.iterator();
- while (it.hasNext()) {
- execute((Runnable)(it.next()));
- long now = Utils.nanoTime();
- nanos -= (now - lastTime);
- lastTime = now;
- if (nanos <= 0)
- return futures;
- }
-
- for (Iterator i = futures.iterator(); i.hasNext();) {
- Future f = (Future)i.next();
- if (!f.isDone()) {
- if (nanos <= 0)
- return futures;
- try {
- f.get(nanos, TimeUnit.NANOSECONDS);
- } catch (CancellationException ignore) {
- } catch (ExecutionException ignore) {
- } catch (TimeoutException toe) {
- return futures;
- }
- long now = Utils.nanoTime();
- nanos -= now - lastTime;
- lastTime = now;
- }
- }
- done = true;
- return futures;
- } finally {
- if (!done)
- for (Iterator i = futures.iterator(); i.hasNext();) {
- Future f = (Future) i.next();
- f.cancel(true);
- }
- }
- }
-
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-06 11:32:36 +0000