0cb4cc4e49
Motivation: We wish to separate these two into clearer write/read interfaces. In particular, we don't want to be able to add listeners to promises, because it makes it easy to add them out of order. We can't prevent it entirely, because any promise can be freely converted to a future where listeners can be added. We can, however, discourage this in the API. Modification: The Promise interface no longer extends the Future interface. Numerous changes to make the project compile and its tests run. Result: Clearer separation of concerns in the code.
303 lines
8.6 KiB
Java
303 lines
8.6 KiB
Java
/*
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* Copyright 2013 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.util.concurrent;
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import static java.util.Objects.requireNonNull;
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import io.netty.util.internal.DefaultPriorityQueue;
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import io.netty.util.internal.StringUtil;
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import java.util.concurrent.Callable;
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import java.util.concurrent.Delayed;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.TimeoutException;
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import java.util.concurrent.atomic.AtomicLong;
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@SuppressWarnings("ComparableImplementedButEqualsNotOverridden")
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final class RunnableScheduledFutureAdapter<V> implements AbstractScheduledEventExecutor.RunnableScheduledFutureNode<V> {
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private static final AtomicLong NEXT_TASK_ID = new AtomicLong();
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private final long id = NEXT_TASK_ID.getAndIncrement();
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private long deadlineNanos;
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/* 0 - no repeat, >0 - repeat at fixed rate, <0 - repeat with fixed delay */
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private final long periodNanos;
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private int queueIndex = INDEX_NOT_IN_QUEUE;
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private final AbstractScheduledEventExecutor executor;
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private final Promise<V> promise;
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private final Future<V> future;
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private final Callable<V> callable;
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RunnableScheduledFutureAdapter(AbstractScheduledEventExecutor executor, Promise<V> promise, Callable<V> callable,
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long deadlineNanos, long periodNanos) {
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this.executor = requireNonNull(executor, "executor");
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this.promise = requireNonNull(promise, "promise");
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future = promise.asFuture();
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this.callable = requireNonNull(callable, "callable");
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this.deadlineNanos = deadlineNanos;
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this.periodNanos = periodNanos;
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}
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@Override
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public EventExecutor executor() {
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return executor;
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}
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@Override
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public long deadlineNanos() {
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return deadlineNanos;
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}
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@Override
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public long delayNanos() {
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return Math.max(0, deadlineNanos() - AbstractScheduledEventExecutor.nanoTime());
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}
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@Override
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public long delayNanos(long currentTimeNanos) {
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return Math.max(0, deadlineNanos() - (currentTimeNanos - AbstractScheduledEventExecutor.START_TIME));
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}
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@Override
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public long getDelay(TimeUnit unit) {
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return unit.convert(delayNanos(), TimeUnit.NANOSECONDS);
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}
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@Override
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public int compareTo(Delayed o) {
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if (this == o) {
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return 0;
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}
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RunnableScheduledFutureAdapter<?> that = (RunnableScheduledFutureAdapter<?>) o;
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long d = deadlineNanos() - that.deadlineNanos();
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if (d < 0) {
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return -1;
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} else if (d > 0) {
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return 1;
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} else if (id < that.id) {
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return -1;
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} else if (id == that.id) {
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throw new Error();
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} else {
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return 1;
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}
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}
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@Override
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public void run() {
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try {
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if (!isPeriodic()) {
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if (promise.setUncancellable()) {
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V result = callable.call();
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promise.setSuccess(result);
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}
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} else {
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// check if is done as it may was cancelled
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if (!isCancelled()) {
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callable.call();
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if (!executor.isShutdown()) {
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long p = periodNanos;
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if (p > 0) {
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deadlineNanos += p;
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} else {
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deadlineNanos = AbstractScheduledEventExecutor.nanoTime() - p;
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}
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if (!isCancelled()) {
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executor.schedule(this);
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}
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}
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}
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}
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} catch (Throwable cause) {
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promise.setFailure(cause);
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}
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}
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/**
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* @param mayInterruptIfRunning this value has no effect in this implementation.
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*/
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@Override
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public boolean cancel(boolean mayInterruptIfRunning) {
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boolean canceled = future.cancel(mayInterruptIfRunning);
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if (canceled) {
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executor.removeScheduled(this);
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}
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return canceled;
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}
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@Override
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public boolean cancel() {
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return cancel(false);
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}
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@Override
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public boolean isSuccess() {
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return promise.isSuccess();
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}
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@Override
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public boolean isFailed() {
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return promise.isFailed();
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}
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@Override
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public boolean isCancellable() {
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return promise.isCancellable();
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}
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@Override
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public Throwable cause() {
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return promise.cause();
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}
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@Override
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public RunnableScheduledFuture<V> addListener(FutureListener<? super V> listener) {
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future.addListener(listener);
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return this;
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}
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@Override
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public <C> RunnableScheduledFuture<V> addListener(C context, FutureContextListener<? super C, ? super V> listener) {
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future.addListener(context, listener);
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return this;
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}
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@Override
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public RunnableScheduledFuture<V> sync() throws InterruptedException {
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future.sync();
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return this;
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}
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@Override
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public RunnableScheduledFuture<V> syncUninterruptibly() {
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future.syncUninterruptibly();
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return this;
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}
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@Override
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public RunnableScheduledFuture<V> await() throws InterruptedException {
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future.await();
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return this;
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}
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@Override
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public RunnableScheduledFuture<V> awaitUninterruptibly() {
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future.awaitUninterruptibly();
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return this;
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}
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@Override
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public boolean await(long timeout, TimeUnit unit) throws InterruptedException {
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return future.await(timeout, unit);
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}
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@Override
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public boolean await(long timeoutMillis) throws InterruptedException {
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return future.await(timeoutMillis);
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}
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@Override
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public boolean awaitUninterruptibly(long timeout, TimeUnit unit) {
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return future.awaitUninterruptibly(timeout, unit);
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}
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@Override
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public boolean awaitUninterruptibly(long timeoutMillis) {
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return future.awaitUninterruptibly(timeoutMillis);
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}
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@Override
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public V getNow() {
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return promise.getNow();
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}
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@Override
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public boolean isPeriodic() {
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return periodNanos != 0;
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}
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@Override
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public boolean isCancelled() {
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return future.isCancelled();
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}
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@Override
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public boolean isDone() {
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return promise.isDone();
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}
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@Override
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public V get() throws InterruptedException, ExecutionException {
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return future.get();
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}
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@Override
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public V get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
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return future.get(timeout, unit);
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}
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@Override
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public int priorityQueueIndex(DefaultPriorityQueue<?> queue) {
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return queueIndex;
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}
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@Override
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public void priorityQueueIndex(DefaultPriorityQueue<?> queue, int i) {
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queueIndex = i;
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}
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@Override
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public String toString() {
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StringBuilder buf = new StringBuilder(64)
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.append(StringUtil.simpleClassName(this))
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.append('@')
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.append(Integer.toHexString(hashCode()));
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if (!isDone()) {
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buf.append("(incomplete)");
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} else {
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Throwable cause = cause();
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if (cause != null) {
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buf.append("(failure: ")
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.append(cause)
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.append(')');
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} else {
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Object result = getNow();
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if (result == null) {
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buf.append("(success)");
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} else {
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buf.append("(success: ")
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.append(result)
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.append(')');
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}
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}
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}
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return buf.append(" task: ")
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.append(callable)
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.append(", id: ")
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.append(id)
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.append(", deadline: ")
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.append(deadlineNanos)
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.append(", period: ")
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.append(periodNanos)
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.append(')').toString();
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}
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}
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