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/**

* Copyright 2014 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 rx;

import static org.junit.Assert.assertTrue;

import java.util.*;

import java.util.concurrent.TimeUnit;

import org.junit.Test;

import rx.functions.Action0;

import rx.schedulers.Schedulers;

public class SchedulerWorkerTest {

static final class CustomDriftScheduler extends Scheduler {

public volatile long drift;

@Override

public Worker createWorker() {

final Worker w = Schedulers.computation().createWorker();

return new Worker() {

@Override

public void unsubscribe() {

w.unsubscribe();

}

@Override

public boolean isUnsubscribed() {

return w.isUnsubscribed();

}

@Override

public Subscription schedule(Action0 action) {

return w.schedule(action);

}

@Override

public Subscription schedule(Action0 action, long delayTime, TimeUnit unit) {

return w.schedule(action, delayTime, unit);

}

@Override

public long now() {

return super.now() + drift;

}

};

}

@Override

public long now() {

return super.now() + drift;

}

}

@Test

public void testCurrentTimeDriftBackwards() throws Exception {

CustomDriftScheduler s = new CustomDriftScheduler();

Scheduler.Worker w = s.createWorker();

try {

final List<Long> times = new ArrayList<Long>();

Subscription d = w.schedulePeriodically(new Action0() {

@Override

public void call() {

times.add(System.currentTimeMillis());

}

}, 100, 100, TimeUnit.MILLISECONDS);

Thread.sleep(150);

s.drift = -1000 - TimeUnit.NANOSECONDS.toMillis(Scheduler.CLOCK_DRIFT_TOLERANCE_NANOS);

Thread.sleep(400);

d.unsubscribe();

Thread.sleep(150);

System.out.println("Runs: " + times.size());

for (int i = 0; i < times.size() - 1 ; i++) {

long diff = times.get(i + 1) - times.get(i);

System.out.println("Diff #" + i + ": " + diff);

assertTrue("" + i + ":" + diff, diff < 150 && diff > 50);

}

assertTrue("Too few invocations: " + times.size(), times.size() > 2);

} finally {

w.unsubscribe();

}

}

@Test

public void testCurrentTimeDriftForwards() throws Exception {

CustomDriftScheduler s = new CustomDriftScheduler();

Scheduler.Worker w = s.createWorker();

try {

final List<Long> times = new ArrayList<Long>();

Subscription d = w.schedulePeriodically(new Action0() {

@Override

public void call() {

times.add(System.currentTimeMillis());

}

}, 100, 100, TimeUnit.MILLISECONDS);

Thread.sleep(150);

s.drift = 1000 + TimeUnit.NANOSECONDS.toMillis(Scheduler.CLOCK_DRIFT_TOLERANCE_NANOS);

Thread.sleep(400);

d.unsubscribe();

Thread.sleep(150);

System.out.println("Runs: " + times.size());

assertTrue(times.size() > 2);

for (int i = 0; i < times.size() - 1 ; i++) {

long diff = times.get(i + 1) - times.get(i);

System.out.println("Diff #" + i + ": " + diff);

assertTrue("Diff out of range: " + diff, diff < 250 && diff > 50);

}

} finally {

w.unsubscribe();

}

}

}