/**
* Copyright 2015 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 com.netflix.hystrix.metric;
import com.netflix.hystrix.ExecutionResult;
import com.netflix.hystrix.HystrixCommandKey;
import com.netflix.hystrix.HystrixEventType;
import com.netflix.hystrix.HystrixThreadPoolKey;
import org.junit.Test;
import rx.Subscriber;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
public class HystrixCommandCompletionStreamTest {
private <T> Subscriber<T> getLatchedSubscriber(final CountDownLatch latch) {
return new Subscriber<T>() {
@Override
public void onCompleted() {
latch.countDown();
}
@Override
public void onError(Throwable e) {
fail(e.getMessage());
e.printStackTrace();
latch.countDown();
}
@Override
public void onNext(T value) {
System.out.println("OnNext : " + value);
}
};
}
static final HystrixCommandKey commandKey = HystrixCommandKey.Factory.asKey("COMMAND");
static final HystrixThreadPoolKey threadPoolKey = HystrixThreadPoolKey.Factory.asKey("ThreadPool");
final HystrixCommandCompletionStream commandStream = new HystrixCommandCompletionStream(commandKey);
@Test
public void noEvents() throws InterruptedException {
CountDownLatch latch = new CountDownLatch(1);
Subscriber<HystrixCommandCompletion> subscriber = getLatchedSubscriber(latch);
commandStream.observe().take(1).subscribe(subscriber);
//no writes
assertFalse(latch.await(1000, TimeUnit.MILLISECONDS));
}
@Test
public void testSingleWriteSingleSubscriber() throws InterruptedException {
CountDownLatch latch = new CountDownLatch(1);
Subscriber<HystrixCommandCompletion> subscriber = getLatchedSubscriber(latch);
commandStream.observe().take(1).subscribe(subscriber);
ExecutionResult result = ExecutionResult.from(HystrixEventType.SUCCESS).setExecutedInThread();
HystrixCommandCompletion event = HystrixCommandCompletion.from(result, commandKey, threadPoolKey);
commandStream.write(event);
assertTrue(latch.await(1000, TimeUnit.MILLISECONDS));
}
@Test
public void testSingleWriteMultipleSubscribers() throws InterruptedException {
CountDownLatch latch1 = new CountDownLatch(1);
Subscriber<HystrixCommandCompletion> subscriber1 = getLatchedSubscriber(latch1);
CountDownLatch latch2 = new CountDownLatch(1);
Subscriber<HystrixCommandCompletion> subscriber2 = getLatchedSubscriber(latch2);
commandStream.observe().take(1).subscribe(subscriber1);
commandStream.observe().take(1).subscribe(subscriber2);
ExecutionResult result = ExecutionResult.from(HystrixEventType.SUCCESS).setExecutedInThread();
HystrixCommandCompletion event = HystrixCommandCompletion.from(result, commandKey, threadPoolKey);
commandStream.write(event);
assertTrue(latch1.await(1000, TimeUnit.MILLISECONDS));
assertTrue(latch2.await(10, TimeUnit.MILLISECONDS));
}
}