/**
* 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.schedulers;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import java.util.HashMap;
import java.util.concurrent.CountDownLatch;
import org.junit.Test;
import rx.Observable;
import rx.Scheduler;
import rx.functions.Action0;
import rx.functions.Action1;
import rx.functions.Func1;
public class ComputationSchedulerTests extends AbstractSchedulerConcurrencyTests {
@Override
protected Scheduler getScheduler() {
// this is an implementation of ExecutorScheduler
return Schedulers.computation();
}
@Test
public void testThreadSafetyWhenSchedulerIsHoppingBetweenThreads() {
final int NUM = 1000000;
final CountDownLatch latch = new CountDownLatch(1);
final HashMap<String, Integer> map = new HashMap<String, Integer>();
final Scheduler.Worker inner = Schedulers.computation().createWorker();
try {
inner.schedule(new Action0() {
private HashMap<String, Integer> statefulMap = map;
int nonThreadSafeCounter = 0;
@Override
public void call() {
Integer i = statefulMap.get("a");
if (i == null) {
i = 1;
statefulMap.put("a", i);
statefulMap.put("b", i);
} else {
i++;
statefulMap.put("a", i);
statefulMap.put("b", i);
}
nonThreadSafeCounter++;
statefulMap.put("nonThreadSafeCounter", nonThreadSafeCounter);
if (i < NUM) {
inner.schedule(this);
} else {
latch.countDown();
}
}
});
try {
latch.await();
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("Count A: " + map.get("a"));
System.out.println("Count B: " + map.get("b"));
System.out.println("nonThreadSafeCounter: " + map.get("nonThreadSafeCounter"));
assertEquals(NUM, map.get("a").intValue());
assertEquals(NUM, map.get("b").intValue());
assertEquals(NUM, map.get("nonThreadSafeCounter").intValue());
} finally {
inner.unsubscribe();
}
}
@Test
public final void testComputationThreadPool1() {
Observable<Integer> o1 = Observable.<Integer> just(1, 2, 3, 4, 5);
Observable<Integer> o2 = Observable.<Integer> just(6, 7, 8, 9, 10);
Observable<String> o = Observable.<Integer> merge(o1, o2).map(new Func1<Integer, String>() {
@Override
public String call(Integer t) {
assertTrue(Thread.currentThread().getName().startsWith("RxComputationThreadPool"));
return "Value_" + t + "_Thread_" + Thread.currentThread().getName();
}
});
o.subscribeOn(Schedulers.computation()).toBlocking().forEach(new Action1<String>() {
@Override
public void call(String t) {
System.out.println("t: " + t);
}
});
}
@Test
public final void testMergeWithExecutorScheduler() {
final String currentThreadName = Thread.currentThread().getName();
Observable<Integer> o1 = Observable.<Integer> just(1, 2, 3, 4, 5);
Observable<Integer> o2 = Observable.<Integer> just(6, 7, 8, 9, 10);
Observable<String> o = Observable.<Integer> merge(o1, o2).subscribeOn(Schedulers.computation()).map(new Func1<Integer, String>() {
@Override
public String call(Integer t) {
assertFalse(Thread.currentThread().getName().equals(currentThreadName));
assertTrue(Thread.currentThread().getName().startsWith("RxComputationThreadPool"));
return "Value_" + t + "_Thread_" + Thread.currentThread().getName();
}
});
o.toBlocking().forEach(new Action1<String>() {
@Override
public void call(String t) {
System.out.println("t: " + t);
}
});
}
@Test
public final void testUnhandledErrorIsDeliveredToThreadHandler() throws InterruptedException {
SchedulerTests.testUnhandledErrorIsDeliveredToThreadHandler(getScheduler());
}
@Test
public final void testHandledErrorIsNotDeliveredToThreadHandler() throws InterruptedException {
SchedulerTests.testHandledErrorIsNotDeliveredToThreadHandler(getScheduler());
}
}