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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"); } } }





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