/**
* Licensed to jclouds, Inc. (jclouds) under one or more
* contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. jclouds licenses this file
* to you 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 org.jclouds.concurrent;
import static com.google.common.collect.Maps.newHashMap;
import static com.google.common.util.concurrent.Futures.immediateFailedFuture;
import static com.google.common.util.concurrent.MoreExecutors.sameThreadExecutor;
import static org.jclouds.concurrent.FutureIterables.transformParallel;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.fail;
import java.util.Map;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicInteger;
import org.jclouds.logging.Logger;
import org.jclouds.rest.AuthorizationException;
import org.testng.annotations.Test;
import com.google.common.base.Function;
import com.google.common.collect.ImmutableSet;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.common.util.concurrent.MoreExecutors;
/**
* Tests behavior of FutureIterables
*
* @author Adrian Cole
*/
@Test(groups = "unit", singleThreaded = true, testName = "FutureIterablesTest")
public class FutureIterablesTest {
public void testAuthorizationExceptionPropagatesAndOnlyTriesOncePerElement() {
final AtomicInteger counter = new AtomicInteger();
try {
transformParallel(ImmutableSet.of("hello", "goodbye"), new Function<String, ListenableFuture<? extends String>>() {
public ListenableFuture<String> apply(String input) {
counter.incrementAndGet();
return immediateFailedFuture(new AuthorizationException());
}
}, sameThreadExecutor(), null, Logger.NULL, "");
fail("Expected AuthorizationException");
} catch (AuthorizationException e) {
assertEquals(counter.get(), 2);
}
}
public void testNormalExceptionPropagatesAsTransformParallelExceptionAndTries5XPerElement() {
final AtomicInteger counter = new AtomicInteger();
try {
transformParallel(ImmutableSet.of("hello", "goodbye"), new Function<String, ListenableFuture<? extends String>>() {
public ListenableFuture<String> apply(String input) {
counter.incrementAndGet();
return immediateFailedFuture(new RuntimeException());
}
}, sameThreadExecutor(), null, Logger.CONSOLE, "");
fail("Expected TransformParallelException");
} catch (TransformParallelException e) {
assertEquals(e.getFromToException().size(), 2);
assertEquals(counter.get(), 10);
}
}
public void testAwaitCompletionTimeout() throws Exception {
final long timeoutMs = 1000;
ListeningExecutorService userExecutor = MoreExecutors.listeningDecorator(Executors.newSingleThreadExecutor());
Map<Void, ListenableFuture<?>> responses = newHashMap();
try {
responses.put(null, userExecutor.submit(new Runnable() {
@Override
public void run() {
try {
Thread.sleep(2 * timeoutMs);
} catch (InterruptedException ie) {
// triggered during shutdown
}
}
}));
Map<Void, Exception> errors = FutureIterables.awaitCompletion(responses, userExecutor, timeoutMs, Logger.NULL,
/* prefix= */"");
if (!errors.isEmpty()) {
throw errors.values().iterator().next();
}
fail("Did not throw TimeoutException");
} catch (TimeoutException te) {
// expected
} finally {
userExecutor.shutdownNow();
}
}
}