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/*
* Copyright (c) 2016-2022 VMware Inc. or its affiliates, All Rights Reserved.
*
* 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 reactor.core.scheduler;
import reactor.core.Disposable;
import reactor.core.Disposables;
import reactor.core.Exceptions;
import reactor.core.Scannable;
/**
* Executes tasks on the caller's thread immediately.
*
* Use the ImmediateScheduler.instance() to get a shared, stateless instance of this scheduler.
* This scheduler is NOT time-capable (can't schedule with delay / periodically).
*
* @author Stephane Maldini
*/
final class ImmediateScheduler implements Scheduler, Scannable {
private static final ImmediateScheduler INSTANCE;
static {
INSTANCE = new ImmediateScheduler();
INSTANCE.init();
}
public static Scheduler instance() {
return INSTANCE;
}
private ImmediateScheduler() {
}
static final Disposable FINISHED = Disposables.disposed();
@Override
public Disposable schedule(Runnable task) {
task.run();
return FINISHED;
}
@Override
public void dispose() {
//NO-OP
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.TERMINATED || key == Attr.CANCELLED) return isDisposed();
if (key == Attr.NAME) return Schedulers.IMMEDIATE;
return null;
}
@Override
public Worker createWorker() {
return new ImmediateSchedulerWorker();
}
static final class ImmediateSchedulerWorker implements Scheduler.Worker, Scannable {
volatile boolean shutdown;
@Override
public Disposable schedule(Runnable task) {
if (shutdown) {
throw Exceptions.failWithRejected();
}
task.run();
return FINISHED;
}
@Override
public void dispose() {
shutdown = true;
}
@Override
public boolean isDisposed() {
return shutdown;
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.TERMINATED || key == Attr.CANCELLED) return shutdown;
if (key == Attr.NAME) return Schedulers.IMMEDIATE + ".worker";
return null;
}
}
}