/
ReschedulingRunnable.java
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/
ReschedulingRunnable.java
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/*
* Copyright 2002-2023 the original author or authors.
*
* Licensed 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
*
* https://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 org.springframework.scheduling.concurrent;
import java.time.Clock;
import java.time.Duration;
import java.time.Instant;
import java.util.concurrent.Delayed;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import org.springframework.lang.Nullable;
import org.springframework.scheduling.Trigger;
import org.springframework.scheduling.support.DelegatingErrorHandlingRunnable;
import org.springframework.scheduling.support.SimpleTriggerContext;
import org.springframework.util.Assert;
import org.springframework.util.ErrorHandler;
/**
* Internal adapter that reschedules an underlying {@link Runnable} according
* to the next execution time suggested by a given {@link Trigger}.
*
* <p>Necessary because a native {@link ScheduledExecutorService} supports
* delay-driven execution only. The flexibility of the {@link Trigger} interface
* will be translated onto a delay for the next execution time (repeatedly).
*
* @author Juergen Hoeller
* @author Mark Fisher
* @since 3.0
*/
class ReschedulingRunnable extends DelegatingErrorHandlingRunnable implements ScheduledFuture<Object> {
private final Trigger trigger;
private final SimpleTriggerContext triggerContext;
private final ScheduledExecutorService executor;
@Nullable
private ScheduledFuture<?> currentFuture;
@Nullable
private Instant scheduledExecutionTime;
private final Object triggerContextMonitor = new Object();
public ReschedulingRunnable(Runnable delegate, Trigger trigger, Clock clock,
ScheduledExecutorService executor, ErrorHandler errorHandler) {
super(delegate, errorHandler);
this.trigger = trigger;
this.triggerContext = new SimpleTriggerContext(clock);
this.executor = executor;
}
@Nullable
public ScheduledFuture<?> schedule() {
synchronized (this.triggerContextMonitor) {
this.scheduledExecutionTime = this.trigger.nextExecution(this.triggerContext);
if (this.scheduledExecutionTime == null) {
return null;
}
Duration delay = Duration.between(this.triggerContext.getClock().instant(), this.scheduledExecutionTime);
this.currentFuture = this.executor.schedule(this, delay.toNanos(), TimeUnit.NANOSECONDS);
return this;
}
}
private ScheduledFuture<?> obtainCurrentFuture() {
Assert.state(this.currentFuture != null, "No scheduled future");
return this.currentFuture;
}
@Override
public void run() {
Instant actualExecutionTime = this.triggerContext.getClock().instant();
super.run();
Instant completionTime = this.triggerContext.getClock().instant();
synchronized (this.triggerContextMonitor) {
Assert.state(this.scheduledExecutionTime != null, "No scheduled execution");
this.triggerContext.update(this.scheduledExecutionTime, actualExecutionTime, completionTime);
if (!obtainCurrentFuture().isCancelled()) {
schedule();
}
}
}
@Override
public boolean cancel(boolean mayInterruptIfRunning) {
synchronized (this.triggerContextMonitor) {
return obtainCurrentFuture().cancel(mayInterruptIfRunning);
}
}
@Override
public boolean isCancelled() {
synchronized (this.triggerContextMonitor) {
return obtainCurrentFuture().isCancelled();
}
}
@Override
public boolean isDone() {
synchronized (this.triggerContextMonitor) {
return obtainCurrentFuture().isDone();
}
}
@Override
public Object get() throws InterruptedException, ExecutionException {
ScheduledFuture<?> curr;
synchronized (this.triggerContextMonitor) {
curr = obtainCurrentFuture();
}
return curr.get();
}
@Override
public Object get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
ScheduledFuture<?> curr;
synchronized (this.triggerContextMonitor) {
curr = obtainCurrentFuture();
}
return curr.get(timeout, unit);
}
@Override
public long getDelay(TimeUnit unit) {
ScheduledFuture<?> curr;
synchronized (this.triggerContextMonitor) {
curr = obtainCurrentFuture();
}
return curr.getDelay(unit);
}
@Override
public int compareTo(Delayed other) {
if (this == other) {
return 0;
}
long diff = getDelay(TimeUnit.NANOSECONDS) - other.getDelay(TimeUnit.NANOSECONDS);
return (diff == 0 ? 0 : (diff < 0 ? -1 : 1));
}
}