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/**

* Copyright 2016 Netflix, Inc.

*

* 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;

import java.util.concurrent.TimeUnit;

import io.reactivex.disposables.*;

import io.reactivex.internal.disposables.*;

import io.reactivex.internal.util.Exceptions;

import io.reactivex.plugins.RxJavaPlugins;

public abstract class Scheduler {

public abstract Worker createWorker();

/**

* Returns the 'current time' of the Scheduler in the specified time unit.

* @param unit the time unit

* @return the 'current time'

*/

public long now(TimeUnit unit) {

return unit.convert(System.currentTimeMillis(), TimeUnit.MILLISECONDS);

}

/*

* TODO Should the lifecycle methods be part of the public API?

*/

public void start() {

}

public void shutdown() {

}

/*

* TODO This helps reducing the memory usage for

* certain one-shot scheduling required operators (such as interval,

* scalarjust + subscribeOn, etc.) but complicates the API

* surface.

*

* So either have default implementation in Scheduler or

* have the operars check for xxxDirect() support and chose paths accordingly.

*/

public Disposable scheduleDirect(Runnable run) {

return scheduleDirect(run, 0L, TimeUnit.NANOSECONDS);

}

/**

* Schedules the given runnable with the given delay directly on a worker of this scheduler.

* <p>Override this method to provide an efficient implementation that,

* for example, doesn't have extra tracking structures for such one-shot

* executions.

* @param run the runnable to schedule

* @param delay the delay time

* @param unit the delay unit

* @return the disposable instance that can cancel the task

*/

public Disposable scheduleDirect(Runnable run, long delay, TimeUnit unit) {

final Worker w = createWorker();

final Runnable decoratedRun = RxJavaPlugins.onSchedule(run);

w.schedule(new Runnable() {

@Override

public void run() {

try {

decoratedRun.run();

} finally {

w.dispose();

}

}

}, delay, unit);

return w;

}

public Disposable schedulePeriodicallyDirect(Runnable run, long initialDelay, long period, TimeUnit unit) {

final ArrayCompositeResource<Disposable> acr = new ArrayCompositeResource<Disposable>(2, Disposables.consumeAndDispose());

final Worker w = createWorker();

acr.lazySet(0, w);

final Runnable decoratedRun = RxJavaPlugins.onSchedule(run);

acr.setResource(1, w.schedulePeriodically(new Runnable() {

@Override

public void run() {

try {

decoratedRun.run();

} catch (Throwable e) {

// make sure the worker is released if the run crashes

acr.dispose();

throw Exceptions.propagate(e);

}

}

}, initialDelay, period, unit));

return acr;

}

public static abstract class Worker implements Disposable {

public abstract Disposable schedule(Runnable run, long delay, TimeUnit unit);

public Disposable schedule(Runnable run) {

return schedule(run, 0L, TimeUnit.NANOSECONDS);

}

public Disposable schedulePeriodically(Runnable run, final long initialDelay, final long period, final TimeUnit unit) {

final MultipleAssignmentResource<Disposable> first = new MultipleAssignmentResource<Disposable>(Disposables.consumeAndDispose());

final MultipleAssignmentResource<Disposable> mar = new MultipleAssignmentResource<Disposable>(Disposables.consumeAndDispose(), first);

final Runnable decoratedRun = RxJavaPlugins.onSchedule(run);

first.setResource(schedule(new Runnable() {

long lastNow = now(unit);

long startTime = lastNow + initialDelay;

long count;

@Override

public void run() {

decoratedRun.run();

long t = now(unit);

long c = ++count;

long targetTime = startTime + c * period;

long delay;

// if the current time is less than last time

// avoid scheduling the next run too far in the future

if (t < lastNow) {

delay = period;

// TODO not sure about this correction

startTime -= lastNow - c * period;

}

// if the current time is ahead of the target time,

// avoid scheduling a bunch of 0 delayed tasks

else if (t > targetTime) {

delay = period;

// TODO not sure about this correction

startTime += t - c * period;

} else {

delay = targetTime - t;

}

lastNow = t;

mar.setResource(schedule(this, delay, unit));

}

}, initialDelay, unit));

return mar;

}

/**

* Returns the 'current time' of the Worker in the specified time unit.

* @param unit the time unit

* @return the 'current time'

*/

public long now(TimeUnit unit) {

return unit.convert(System.currentTimeMillis(), TimeUnit.MILLISECONDS);

}

}

}