io.netty.util.concurrent.ScheduledFutureTask Maven / Gradle / Ivy
/*
* Copyright 2013 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.util.concurrent;
import io.netty.util.internal.DefaultPriorityQueue;
import io.netty.util.internal.PriorityQueueNode;
import java.util.Queue;
import java.util.concurrent.Callable;
import java.util.concurrent.Delayed;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
@SuppressWarnings("ComparableImplementedButEqualsNotOverridden")
final class ScheduledFutureTask extends PromiseTask implements ScheduledFuture, PriorityQueueNode {
private static final AtomicLong nextTaskId = new AtomicLong();
private static final long START_TIME = System.nanoTime();
static long nanoTime() {
return System.nanoTime() - START_TIME;
}
static long deadlineNanos(long delay) {
long deadlineNanos = nanoTime() + delay;
// Guard against overflow
return deadlineNanos < 0 ? Long.MAX_VALUE : deadlineNanos;
}
private final long id = nextTaskId.getAndIncrement();
private long deadlineNanos;
/* 0 - no repeat, >0 - repeat at fixed rate, <0 - repeat with fixed delay */
private final long periodNanos;
private int queueIndex = INDEX_NOT_IN_QUEUE;
ScheduledFutureTask(
AbstractScheduledEventExecutor executor,
Runnable runnable, V result, long nanoTime) {
this(executor, toCallable(runnable, result), nanoTime);
}
ScheduledFutureTask(
AbstractScheduledEventExecutor executor,
Callable callable, long nanoTime, long period) {
super(executor, callable);
if (period == 0) {
throw new IllegalArgumentException("period: 0 (expected: != 0)");
}
deadlineNanos = nanoTime;
periodNanos = period;
}
ScheduledFutureTask(
AbstractScheduledEventExecutor executor,
Callable callable, long nanoTime) {
super(executor, callable);
deadlineNanos = nanoTime;
periodNanos = 0;
}
@Override
protected EventExecutor executor() {
return super.executor();
}
public long deadlineNanos() {
return deadlineNanos;
}
public long delayNanos() {
return Math.max(0, deadlineNanos() - nanoTime());
}
public long delayNanos(long currentTimeNanos) {
return Math.max(0, deadlineNanos() - (currentTimeNanos - START_TIME));
}
@Override
public long getDelay(TimeUnit unit) {
return unit.convert(delayNanos(), TimeUnit.NANOSECONDS);
}
@Override
public int compareTo(Delayed o) {
if (this == o) {
return 0;
}
ScheduledFutureTask that = (ScheduledFutureTask) o;
long d = deadlineNanos() - that.deadlineNanos();
if (d < 0) {
return -1;
} else if (d > 0) {
return 1;
} else if (id < that.id) {
return -1;
} else if (id == that.id) {
throw new Error();
} else {
return 1;
}
}
@Override
public void run() {
assert executor().inEventLoop();
try {
if (periodNanos == 0) {
if (setUncancellableInternal()) {
V result = task.call();
setSuccessInternal(result);
}
} else {
// check if is done as it may was cancelled
if (!isCancelled()) {
task.call();
if (!executor().isShutdown()) {
long p = periodNanos;
if (p > 0) {
deadlineNanos += p;
} else {
deadlineNanos = nanoTime() - p;
}
if (!isCancelled()) {
// scheduledTaskQueue can never be null as we lazy init it before submit the task!
Queue> scheduledTaskQueue =
((AbstractScheduledEventExecutor) executor()).scheduledTaskQueue;
assert scheduledTaskQueue != null;
scheduledTaskQueue.add(this);
}
}
}
}
} catch (Throwable cause) {
setFailureInternal(cause);
}
}
/**
* {@inheritDoc}
*
* @param mayInterruptIfRunning this value has no effect in this implementation.
*/
@Override
public boolean cancel(boolean mayInterruptIfRunning) {
boolean canceled = super.cancel(mayInterruptIfRunning);
if (canceled) {
((AbstractScheduledEventExecutor) executor()).removeScheduled(this);
}
return canceled;
}
boolean cancelWithoutRemove(boolean mayInterruptIfRunning) {
return super.cancel(mayInterruptIfRunning);
}
@Override
protected StringBuilder toStringBuilder() {
StringBuilder buf = super.toStringBuilder();
buf.setCharAt(buf.length() - 1, ',');
return buf.append(" id: ")
.append(id)
.append(", deadline: ")
.append(deadlineNanos)
.append(", period: ")
.append(periodNanos)
.append(')');
}
@Override
public int priorityQueueIndex(DefaultPriorityQueue queue) {
return queueIndex;
}
@Override
public void priorityQueueIndex(DefaultPriorityQueue queue, int i) {
queueIndex = i;
}
}