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/*
* Copyright (c) 2016-present, RxJava Contributors.
*
* 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
*
* 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.reactivex.rxjava3.internal.schedulers;
import java.util.concurrent.TimeUnit;
import io.reactivex.rxjava3.annotations.NonNull;
import io.reactivex.rxjava3.core.Scheduler;
import io.reactivex.rxjava3.disposables.*;
/**
* A Scheduler partially implementing the API by allowing only non-delayed, non-periodic
* task execution on the current thread immediately.
*
* Note that this doesn't support recursive scheduling and disposing the returned Disposable
* has no effect (because when the schedule() method returns, the task has been already run).
*/
public final class ImmediateThinScheduler extends Scheduler {
/**
* The singleton instance of the immediate (thin) scheduler.
*/
public static final Scheduler INSTANCE = new ImmediateThinScheduler();
static final Worker WORKER = new ImmediateThinWorker();
static final Disposable DISPOSED;
static {
DISPOSED = Disposable.empty();
DISPOSED.dispose();
}
private ImmediateThinScheduler() {
// singleton class
}
@NonNull
@Override
public Disposable scheduleDirect(@NonNull Runnable run) {
run.run();
return DISPOSED;
}
@NonNull
@Override
public Disposable scheduleDirect(@NonNull Runnable run, long delay, TimeUnit unit) {
throw new UnsupportedOperationException("This scheduler doesn't support delayed execution");
}
@NonNull
@Override
public Disposable schedulePeriodicallyDirect(@NonNull Runnable run, long initialDelay, long period, TimeUnit unit) {
throw new UnsupportedOperationException("This scheduler doesn't support periodic execution");
}
@NonNull
@Override
public Worker createWorker() {
return WORKER;
}
static final class ImmediateThinWorker extends Worker {
@Override
public void dispose() {
// This worker is always stateless and won't track tasks
}
@Override
public boolean isDisposed() {
return false; // dispose() has no effect
}
@NonNull
@Override
public Disposable schedule(@NonNull Runnable run) {
run.run();
return DISPOSED;
}
@NonNull
@Override
public Disposable schedule(@NonNull Runnable run, long delay, @NonNull TimeUnit unit) {
throw new UnsupportedOperationException("This scheduler doesn't support delayed execution");
}
@NonNull
@Override
public Disposable schedulePeriodically(@NonNull Runnable run, long initialDelay, long period, TimeUnit unit) {
throw new UnsupportedOperationException("This scheduler doesn't support periodic execution");
}
}
}