/**
* 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.flowable;
import static org.junit.Assert.assertEquals;
import static org.mockito.Mockito.*;
import java.util.*;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.*;
import org.mockito.InOrder;
import org.reactivestreams.Subscriber;
import io.reactivex.*;
import io.reactivex.Flowable;
import io.reactivex.exceptions.TestException;
import io.reactivex.functions.*;
import io.reactivex.schedulers.Schedulers;
import io.reactivex.subscribers.*;
public class FlowableTakeLastTest {
@Test
public void testTakeLastEmpty() {
Flowable<String> w = Flowable.empty();
Flowable<String> take = w.takeLast(2);
Subscriber<String> observer = TestHelper.mockSubscriber();
take.subscribe(observer);
verify(observer, never()).onNext(any(String.class));
verify(observer, never()).onError(any(Throwable.class));
verify(observer, times(1)).onComplete();
}
@Test
public void testTakeLast1() {
Flowable<String> w = Flowable.just("one", "two", "three");
Flowable<String> take = w.takeLast(2);
Subscriber<String> observer = TestHelper.mockSubscriber();
InOrder inOrder = inOrder(observer);
take.subscribe(observer);
inOrder.verify(observer, times(1)).onNext("two");
inOrder.verify(observer, times(1)).onNext("three");
verify(observer, never()).onNext("one");
verify(observer, never()).onError(any(Throwable.class));
verify(observer, times(1)).onComplete();
}
@Test
public void testTakeLast2() {
Flowable<String> w = Flowable.just("one");
Flowable<String> take = w.takeLast(10);
Subscriber<String> observer = TestHelper.mockSubscriber();
take.subscribe(observer);
verify(observer, times(1)).onNext("one");
verify(observer, never()).onError(any(Throwable.class));
verify(observer, times(1)).onComplete();
}
@Test
public void testTakeLastWithZeroCount() {
Flowable<String> w = Flowable.just("one");
Flowable<String> take = w.takeLast(0);
Subscriber<String> observer = TestHelper.mockSubscriber();
take.subscribe(observer);
verify(observer, never()).onNext("one");
verify(observer, never()).onError(any(Throwable.class));
verify(observer, times(1)).onComplete();
}
@Test
@Ignore("Null values no longer allowed")
public void testTakeLastWithNull() {
Flowable<String> w = Flowable.just("one", null, "three");
Flowable<String> take = w.takeLast(2);
Subscriber<String> observer = TestHelper.mockSubscriber();
take.subscribe(observer);
verify(observer, never()).onNext("one");
verify(observer, times(1)).onNext(null);
verify(observer, times(1)).onNext("three");
verify(observer, never()).onError(any(Throwable.class));
verify(observer, times(1)).onComplete();
}
@Test(expected = IndexOutOfBoundsException.class)
public void testTakeLastWithNegativeCount() {
Flowable.just("one").takeLast(-1);
}
@Test
public void testBackpressure1() {
TestSubscriber<Integer> ts = new TestSubscriber<Integer>();
Flowable.range(1, 100000).takeLast(1)
.observeOn(Schedulers.newThread())
.map(newSlowProcessor()).subscribe(ts);
ts.awaitTerminalEvent();
ts.assertNoErrors();
ts.assertValue(100000);
}
@Test
public void testBackpressure2() {
TestSubscriber<Integer> ts = new TestSubscriber<Integer>();
Flowable.range(1, 100000).takeLast(Flowable.bufferSize() * 4)
.observeOn(Schedulers.newThread()).map(newSlowProcessor()).subscribe(ts);
ts.awaitTerminalEvent();
ts.assertNoErrors();
assertEquals(Flowable.bufferSize() * 4, ts.valueCount());
}
private Function<Integer, Integer> newSlowProcessor() {
return new Function<Integer, Integer>() {
int c;
@Override
public Integer apply(Integer i) {
if (c++ < 100) {
try {
Thread.sleep(1);
} catch (InterruptedException e) {
}
}
return i;
}
};
}
@Test
public void testIssue1522() {
// https://github.com/ReactiveX/RxJava/issues/1522
assertEquals(0, Flowable
.empty()
.count()
.toFlowable()
.filter(new Predicate<Long>() {
@Override
public boolean test(Long v) {
return false;
}
})
.toList()
.blockingGet().size());
}
@Test
public void testIgnoreRequest1() {
// If `takeLast` does not ignore `request` properly, StackOverflowError will be thrown.
Flowable.range(0, 100000).takeLast(100000).subscribe(new DefaultSubscriber<Integer>() {
@Override
public void onStart() {
request(Long.MAX_VALUE);
}
@Override
public void onComplete() {
}
@Override
public void onError(Throwable e) {
}
@Override
public void onNext(Integer integer) {
request(Long.MAX_VALUE);
}
});
}
@Test
public void testIgnoreRequest2() {
// If `takeLast` does not ignore `request` properly, StackOverflowError will be thrown.
Flowable.range(0, 100000).takeLast(100000).subscribe(new DefaultSubscriber<Integer>() {
@Override
public void onStart() {
request(1);
}
@Override
public void onComplete() {
}
@Override
public void onError(Throwable e) {
}
@Override
public void onNext(Integer integer) {
request(1);
}
});
}
@Test(timeout = 30000)
public void testIgnoreRequest3() {
// If `takeLast` does not ignore `request` properly, it will enter an infinite loop.
Flowable.range(0, 100000).takeLast(100000).subscribe(new DefaultSubscriber<Integer>() {
@Override
public void onStart() {
request(1);
}
@Override
public void onComplete() {
}
@Override
public void onError(Throwable e) {
}
@Override
public void onNext(Integer integer) {
request(Long.MAX_VALUE);
}
});
}
@Test
public void testIgnoreRequest4() {
// If `takeLast` does not ignore `request` properly, StackOverflowError will be thrown.
Flowable.range(0, 100000).takeLast(100000).subscribe(new DefaultSubscriber<Integer>() {
@Override
public void onStart() {
request(Long.MAX_VALUE);
}
@Override
public void onComplete() {
}
@Override
public void onError(Throwable e) {
}
@Override
public void onNext(Integer integer) {
request(1);
}
});
}
@Test
public void testUnsubscribeTakesEffectEarlyOnFastPath() {
final AtomicInteger count = new AtomicInteger();
Flowable.range(0, 100000).takeLast(100000).subscribe(new DefaultSubscriber<Integer>() {
@Override
public void onStart() {
request(Long.MAX_VALUE);
}
@Override
public void onComplete() {
}
@Override
public void onError(Throwable e) {
}
@Override
public void onNext(Integer integer) {
count.incrementAndGet();
cancel();
}
});
assertEquals(1,count.get());
}
@Test(timeout = 10000)
public void testRequestOverflow() {
final List<Integer> list = new ArrayList<Integer>();
Flowable.range(1, 100).takeLast(50).subscribe(new DefaultSubscriber<Integer>() {
@Override
public void onStart() {
request(2);
}
@Override
public void onComplete() {
}
@Override
public void onError(Throwable e) {
}
@Override
public void onNext(Integer t) {
list.add(t);
request(Long.MAX_VALUE - 1);
}});
assertEquals(50, list.size());
}
@Test
public void dispose() {
TestHelper.checkDisposed(Flowable.range(1, 10).takeLast(5));
}
@Test
public void doubleOnSubscribe() {
TestHelper.checkDoubleOnSubscribeFlowable(new Function<Flowable<Object>, Flowable<Object>>() {
@Override
public Flowable<Object> apply(Flowable<Object> o) throws Exception {
return o.takeLast(5);
}
});
}
@Test
public void error() {
Flowable.error(new TestException())
.takeLast(5)
.test()
.assertFailure(TestException.class);
}
@Test
public void takeLastTake() {
Flowable.range(1, 10)
.takeLast(5)
.take(2)
.test()
.assertResult(6, 7);
}
}