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      1 /*
      2  * Copyright (C) 2011 The Guava Authors
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  * http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.google.common.util.concurrent;
     18 
     19 import com.google.common.collect.ImmutableList;
     20 
     21 import junit.framework.TestCase;
     22 
     23 import java.util.List;
     24 import java.util.concurrent.Callable;
     25 import java.util.concurrent.TimeUnit;
     26 
     27 /**
     28  * Tests for {@link AbstractListeningExecutorService}.
     29  *
     30  * @author Colin Decker
     31  */
     32 public class AbstractListeningExecutorServiceTest extends TestCase {
     33 
     34   public void testSubmit() throws Exception {
     35     /*
     36      * Mostly just tests that ListenableFutureTasks are created and run; tests for
     37      * ListenableFutureTask should ensure that listeners are called correctly.
     38      */
     39 
     40     TestListeningExecutorService e = new TestListeningExecutorService();
     41 
     42     TestRunnable runnable = new TestRunnable();
     43     ListenableFuture<?> runnableFuture = e.submit(runnable);
     44     assertTrue(runnableFuture instanceof ListenableFutureTask);
     45     assertTrue(runnableFuture.isDone());
     46     assertTrue(runnable.run);
     47 
     48     ListenableFuture<String> callableFuture = e.submit(new TestCallable());
     49     assertTrue(callableFuture instanceof ListenableFutureTask);
     50     assertTrue(callableFuture.isDone());
     51     assertEquals("foo", callableFuture.get());
     52 
     53     TestRunnable runnable2 = new TestRunnable();
     54     ListenableFuture<Integer> runnableFuture2 = e.submit(runnable2, 3);
     55     assertTrue(runnableFuture2 instanceof ListenableFutureTask);
     56     assertTrue(runnableFuture2.isDone());
     57     assertTrue(runnable2.run);
     58     assertEquals((Integer) 3, runnableFuture2.get());
     59   }
     60 
     61   private static class TestRunnable implements Runnable {
     62     boolean run = false;
     63 
     64     @Override
     65     public void run() {
     66       run = true;
     67     }
     68   }
     69 
     70   private static class TestCallable implements Callable<String> {
     71     @Override
     72     public String call() {
     73       return "foo";
     74     }
     75   }
     76 
     77   /**
     78    * Simple same thread listening executor service that doesn't handle shutdown.
     79    */
     80   private static class TestListeningExecutorService extends AbstractListeningExecutorService {
     81 
     82     @Override
     83     public void execute(Runnable runnable) {
     84       assertTrue(runnable instanceof ListenableFutureTask);
     85       runnable.run();
     86     }
     87 
     88     @Override
     89     public void shutdown() {
     90     }
     91 
     92     @Override
     93     public List<Runnable> shutdownNow() {
     94       return ImmutableList.of();
     95     }
     96 
     97     @Override
     98     public boolean isShutdown() {
     99       return false;
    100     }
    101 
    102     @Override
    103     public boolean isTerminated() {
    104       return false;
    105     }
    106 
    107     @Override
    108     public boolean awaitTermination(long timeout, TimeUnit unit) {
    109       return false;
    110     }
    111   }
    112 }
    113