| Methods Summary |
|---|
| private T | doInvokeAny(java.util.Collection tasks, boolean timed, long nanos)the main mechanics of invokeAny.
if (tasks == null)
throw new NullPointerException();
int ntasks = tasks.size();
if (ntasks == 0)
throw new IllegalArgumentException();
List<Future<T>> futures= new ArrayList<Future<T>>(ntasks);
ExecutorCompletionService<T> ecs =
new ExecutorCompletionService<T>(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)? System.nanoTime() : 0;
Iterator<? extends Callable<T>> it = tasks.iterator();
// Start one task for sure; the rest incrementally
futures.add(ecs.submit(it.next()));
--ntasks;
int active = 1;
for (;;) {
Future<T> f = ecs.poll();
if (f == null) {
if (ntasks > 0) {
--ntasks;
futures.add(ecs.submit(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 = System.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 (Future<T> f : futures)
f.cancel(true);
}
|
| public java.util.List | invokeAll(java.util.Collection tasks, long timeout, java.util.concurrent.TimeUnit unit)
if (tasks == null || unit == null)
throw new NullPointerException();
long nanos = unit.toNanos(timeout);
List<Future<T>> futures = new ArrayList<Future<T>>(tasks.size());
boolean done = false;
try {
for (Callable<T> t : tasks)
futures.add(newTaskFor(t));
long lastTime = System.nanoTime();
// Interleave time checks and calls to execute in case
// executor doesn't have any/much parallelism.
Iterator<Future<T>> it = futures.iterator();
while (it.hasNext()) {
execute((Runnable)(it.next()));
long now = System.nanoTime();
nanos -= now - lastTime;
lastTime = now;
if (nanos <= 0)
return futures;
}
for (Future<T> f : futures) {
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 = System.nanoTime();
nanos -= now - lastTime;
lastTime = now;
}
}
done = true;
return futures;
} finally {
if (!done)
for (Future<T> f : futures)
f.cancel(true);
}
|
| public java.util.List | invokeAll(java.util.Collection tasks)
if (tasks == null)
throw new NullPointerException();
List<Future<T>> futures = new ArrayList<Future<T>>(tasks.size());
boolean done = false;
try {
for (Callable<T> t : tasks) {
RunnableFuture<T> f = newTaskFor(t);
futures.add(f);
execute(f);
}
for (Future<T> f : futures) {
if (!f.isDone()) {
try {
f.get();
} catch (CancellationException ignore) {
} catch (ExecutionException ignore) {
}
}
}
done = true;
return futures;
} finally {
if (!done)
for (Future<T> f : futures)
f.cancel(true);
}
|
| public T | invokeAny(java.util.Collection tasks)
try {
return doInvokeAny(tasks, false, 0);
} catch (TimeoutException cannotHappen) {
assert false;
return null;
}
|
| public T | invokeAny(java.util.Collection tasks, long timeout, java.util.concurrent.TimeUnit unit)
return doInvokeAny(tasks, true, unit.toNanos(timeout));
|
| protected java.util.concurrent.RunnableFuture | newTaskFor(java.lang.Runnable runnable, T value)Returns a RunnableFuture for the given runnable and default
value.
return new FutureTask<T>(runnable, value);
|
| protected java.util.concurrent.RunnableFuture | newTaskFor(java.util.concurrent.Callable callable)Returns a RunnableFuture for the given callable task.
return new FutureTask<T>(callable);
|
| public java.util.concurrent.Future | submit(java.lang.Runnable task)
if (task == null) throw new NullPointerException();
RunnableFuture<Object> ftask = newTaskFor(task, null);
execute(ftask);
return ftask;
|
| public java.util.concurrent.Future | submit(java.lang.Runnable task, T result)
if (task == null) throw new NullPointerException();
RunnableFuture<T> ftask = newTaskFor(task, result);
execute(ftask);
return ftask;
|
| public java.util.concurrent.Future | submit(java.util.concurrent.Callable task)
if (task == null) throw new NullPointerException();
RunnableFuture<T> ftask = newTaskFor(task);
execute(ftask);
return ftask;
|
