/**
* 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.internal.operators.observable;
import static org.junit.Assert.*;
import java.util.*;
import java.util.concurrent.TimeUnit;
import org.junit.*;
import io.reactivex.Observable;
import io.reactivex.Observer;
import io.reactivex.TestHelper;
import io.reactivex.exceptions.TestException;
import io.reactivex.plugins.RxJavaPlugins;
import io.reactivex.schedulers.TestScheduler;
import io.reactivex.subjects.PublishSubject;
public class BlockingObservableLatestTest {
@Test(timeout = 1000)
public void testSimple() {
TestScheduler scheduler = new TestScheduler();
Observable<Long> source = Observable.interval(1, TimeUnit.SECONDS, scheduler).take(10);
Iterable<Long> iter = source.blockingLatest();
Iterator<Long> it = iter.iterator();
// only 9 because take(10) will immediately call onComplete when receiving the 10th item
// which onComplete will overwrite the previous value
for (int i = 0; i < 9; i++) {
scheduler.advanceTimeBy(1, TimeUnit.SECONDS);
Assert.assertEquals(true, it.hasNext());
Assert.assertEquals(Long.valueOf(i), it.next());
}
scheduler.advanceTimeBy(1, TimeUnit.SECONDS);
Assert.assertEquals(false, it.hasNext());
}
@Test(timeout = 1000)
public void testSameSourceMultipleIterators() {
TestScheduler scheduler = new TestScheduler();
Observable<Long> source = Observable.interval(1, TimeUnit.SECONDS, scheduler).take(10);
Iterable<Long> iter = source.blockingLatest();
for (int j = 0; j < 3; j++) {
Iterator<Long> it = iter.iterator();
// only 9 because take(10) will immediately call onComplete when receiving the 10th item
// which onComplete will overwrite the previous value
for (int i = 0; i < 9; i++) {
scheduler.advanceTimeBy(1, TimeUnit.SECONDS);
Assert.assertEquals(true, it.hasNext());
Assert.assertEquals(Long.valueOf(i), it.next());
}
scheduler.advanceTimeBy(1, TimeUnit.SECONDS);
Assert.assertEquals(false, it.hasNext());
}
}
@Test(timeout = 1000, expected = NoSuchElementException.class)
public void testEmpty() {
Observable<Long> source = Observable.<Long> empty();
Iterable<Long> iter = source.blockingLatest();
Iterator<Long> it = iter.iterator();
Assert.assertEquals(false, it.hasNext());
it.next();
}
@Test(timeout = 1000, expected = NoSuchElementException.class)
public void testSimpleJustNext() {
TestScheduler scheduler = new TestScheduler();
Observable<Long> source = Observable.interval(1, TimeUnit.SECONDS, scheduler).take(10);
Iterable<Long> iter = source.blockingLatest();
Iterator<Long> it = iter.iterator();
// only 9 because take(10) will immediately call onComplete when receiving the 10th item
// which onComplete will overwrite the previous value
for (int i = 0; i < 10; i++) {
scheduler.advanceTimeBy(1, TimeUnit.SECONDS);
Assert.assertEquals(Long.valueOf(i), it.next());
}
}
@Test(/* timeout = 1000, */expected = RuntimeException.class)
public void testHasNextThrows() {
TestScheduler scheduler = new TestScheduler();
Observable<Long> source = Observable.<Long> error(new RuntimeException("Forced failure!")).subscribeOn(scheduler);
Iterable<Long> iter = source.blockingLatest();
Iterator<Long> it = iter.iterator();
scheduler.advanceTimeBy(1, TimeUnit.SECONDS);
it.hasNext();
}
@Test(timeout = 1000, expected = RuntimeException.class)
public void testNextThrows() {
TestScheduler scheduler = new TestScheduler();
Observable<Long> source = Observable.<Long> error(new RuntimeException("Forced failure!")).subscribeOn(scheduler);
Iterable<Long> iter = source.blockingLatest();
Iterator<Long> it = iter.iterator();
scheduler.advanceTimeBy(1, TimeUnit.SECONDS);
it.next();
}
@Test(timeout = 1000)
public void testFasterSource() {
PublishSubject<Integer> source = PublishSubject.create();
Observable<Integer> blocker = source;
Iterable<Integer> iter = blocker.blockingLatest();
Iterator<Integer> it = iter.iterator();
source.onNext(1);
Assert.assertEquals(Integer.valueOf(1), it.next());
source.onNext(2);
source.onNext(3);
Assert.assertEquals(Integer.valueOf(3), it.next());
source.onNext(4);
source.onNext(5);
source.onNext(6);
Assert.assertEquals(Integer.valueOf(6), it.next());
source.onNext(7);
source.onComplete();
Assert.assertEquals(false, it.hasNext());
}
@Test(expected = UnsupportedOperationException.class)
public void remove() {
Observable.never().blockingLatest().iterator().remove();
}
@Test(expected = NoSuchElementException.class)
public void empty() {
Observable.empty().blockingLatest().iterator().next();
}
@Test(expected = TestException.class)
public void error() {
Observable.error(new TestException()).blockingLatest().iterator().next();
}
@Test
public void error2() {
Iterator<Object> it = Observable.error(new TestException()).blockingLatest().iterator();
for (int i = 0; i < 3; i++) {
try {
it.hasNext();
fail("Should have thrown");
} catch (TestException ex) {
// expected
}
}
}
@Test
public void interrupted() {
Iterator<Object> it = Observable.never().blockingLatest().iterator();
Thread.currentThread().interrupt();
try {
it.hasNext();
} catch (RuntimeException ex) {
assertTrue(ex.toString(), ex.getCause() instanceof InterruptedException);
}
Thread.interrupted();
}
@SuppressWarnings("unchecked")
@Test
public void onError() {
Iterator<Object> it = Observable.never().blockingLatest().iterator();
List<Throwable> errors = TestHelper.trackPluginErrors();
try {
((Observer<Object>)it).onError(new TestException());
TestHelper.assertUndeliverable(errors, 0, TestException.class);
} finally {
RxJavaPlugins.reset();
}
}
}