common/util/src/test/java/org/opendaylight/yangtools/util/concurrent/DeadlockDetectingListeningExecutorServiceTest.java

   1 /*
   2  * Copyright (c) 2014 Brocade Communications Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.yangtools.util.concurrent;
  10
  11 import static org.junit.Assert.assertEquals;
  12 import static org.junit.Assert.assertNotNull;
  13 import static org.junit.Assert.assertTrue;
  14 import static org.opendaylight.yangtools.util.concurrent.AsyncNotifyingListeningExecutorServiceTest.testListenerCallback;
  15 import static org.opendaylight.yangtools.util.concurrent.CommonTestUtils.SUBMIT_CALLABLE;
  16 import static org.opendaylight.yangtools.util.concurrent.CommonTestUtils.SUBMIT_RUNNABLE;
  17 import static org.opendaylight.yangtools.util.concurrent.CommonTestUtils.SUBMIT_RUNNABLE_WITH_RESULT;
  18
  19 import com.google.common.base.Supplier;
  20 import com.google.common.util.concurrent.FutureCallback;
  21 import com.google.common.util.concurrent.Futures;
  22 import com.google.common.util.concurrent.ListenableFuture;
  23 import com.google.common.util.concurrent.ListeningExecutorService;
  24 import com.google.common.util.concurrent.ThreadFactoryBuilder;
  25 import java.util.concurrent.CountDownLatch;
  26 import java.util.concurrent.ExecutionException;
  27 import java.util.concurrent.Executor;
  28 import java.util.concurrent.ExecutorService;
  29 import java.util.concurrent.Executors;
  30 import java.util.concurrent.TimeUnit;
  31 import java.util.concurrent.atomic.AtomicReference;
  32 import javax.annotation.Nonnull;
  33 import org.junit.After;
  34 import org.junit.Before;
  35 import org.junit.Test;
  36 import org.opendaylight.yangtools.util.concurrent.CommonTestUtils.Invoker;
  37
  38 /**
  39  * Unit tests for DeadlockDetectingListeningExecutorService.
  40  *
  41  * @author Thomas Pantelis
  42  */
  43 public class DeadlockDetectingListeningExecutorServiceTest {
  44
  45     interface InitialInvoker {
  46         void invokeExecutor(ListeningExecutorService executor, Runnable task);
  47     }
  48
  49     static final InitialInvoker SUBMIT = ListeningExecutorService::submit;
  50
  51     static final InitialInvoker EXECUTE = Executor::execute;
  52
  53     public static class TestDeadlockException extends Exception {
  54         private static final long serialVersionUID = 1L;
  55
  56     }
  57
  58     private static final Supplier<Exception> DEADLOCK_EXECUTOR_SUPPLIER = TestDeadlockException::new;
  59
  60     DeadlockDetectingListeningExecutorService executor;
  61
  62     @Before
  63     public void setup() {
  64     }
  65
  66     @After
  67     public void tearDown() {
  68         if (executor != null) {
  69             executor.shutdownNow();
  70         }
  71     }
  72
  73     DeadlockDetectingListeningExecutorService newExecutor() {
  74         return new DeadlockDetectingListeningExecutorService(Executors.newSingleThreadExecutor(),
  75                 DEADLOCK_EXECUTOR_SUPPLIER);
  76     }
  77
  78     @Test
  79     public void testBlockingSubmitOffExecutor() throws Exception {
  80
  81         executor = newExecutor();
  82
  83         // Test submit with Callable.
  84
  85         ListenableFuture<String> future = executor.submit(() -> "foo");
  86
  87         assertEquals( "Future result", "foo", future.get( 5, TimeUnit.SECONDS));
  88
  89         // Test submit with Runnable.
  90
  91         executor.submit(() -> {
  92         }).get();
  93
  94         // Test submit with Runnable and value.
  95
  96         future = executor.submit(() -> { }, "foo");
  97
  98         assertEquals("Future result", "foo", future.get(5, TimeUnit.SECONDS));
  99     }
 100
 101     @Test
 102     public void testNonBlockingSubmitOnExecutorThread() throws Throwable {
 103
 104         executor = newExecutor();
 105
 106         testNonBlockingSubmitOnExecutorThread(SUBMIT, SUBMIT_CALLABLE);
 107         testNonBlockingSubmitOnExecutorThread(SUBMIT, SUBMIT_RUNNABLE);
 108         testNonBlockingSubmitOnExecutorThread(SUBMIT, SUBMIT_RUNNABLE_WITH_RESULT);
 109
 110         testNonBlockingSubmitOnExecutorThread(EXECUTE, SUBMIT_CALLABLE);
 111     }
 112
 113     void testNonBlockingSubmitOnExecutorThread(final InitialInvoker initialInvoker, final Invoker invoker)
 114             throws Throwable {
 115
 116         final AtomicReference<Throwable> caughtEx = new AtomicReference<>();
 117         final CountDownLatch futureCompletedLatch = new CountDownLatch(1);
 118
 119         Runnable task = () -> Futures.addCallback(invoker.invokeExecutor(executor, null), new FutureCallback<Object>() {
 120             @Override
 121             public void onSuccess(final Object result) {
 122                 futureCompletedLatch.countDown();
 123             }
 124
 125             @Override
 126             public void onFailure(@Nonnull final Throwable t) {
 127                 caughtEx.set(t);
 128                 futureCompletedLatch.countDown();
 129             }
 130         });
 131
 132         initialInvoker.invokeExecutor(executor, task);
 133
 134         assertTrue("Task did not complete - executor likely deadlocked",
 135                 futureCompletedLatch.await(5, TimeUnit.SECONDS));
 136
 137         if (caughtEx.get() != null) {
 138             throw caughtEx.get();
 139         }
 140     }
 141
 142     @Test
 143     public void testBlockingSubmitOnExecutorThread() throws Exception {
 144
 145         executor = newExecutor();
 146
 147         testBlockingSubmitOnExecutorThread(SUBMIT, SUBMIT_CALLABLE);
 148         testBlockingSubmitOnExecutorThread(SUBMIT, SUBMIT_RUNNABLE);
 149         testBlockingSubmitOnExecutorThread(SUBMIT, SUBMIT_RUNNABLE_WITH_RESULT);
 150
 151         testBlockingSubmitOnExecutorThread(EXECUTE, SUBMIT_CALLABLE);
 152     }
 153
 154     void testBlockingSubmitOnExecutorThread(final InitialInvoker initialInvoker, final Invoker invoker)
 155             throws Exception {
 156
 157         final AtomicReference<Throwable> caughtEx = new AtomicReference<>();
 158         final CountDownLatch latch = new CountDownLatch(1);
 159
 160         Runnable task = () -> {
 161
 162             try {
 163                 invoker.invokeExecutor(executor, null).get();
 164             } catch(ExecutionException e) {
 165                 caughtEx.set(e.getCause());
 166             } catch(Throwable e) {
 167                 caughtEx.set(e);
 168             } finally {
 169                 latch.countDown();
 170             }
 171         };
 172
 173         initialInvoker.invokeExecutor(executor, task);
 174
 175         assertTrue("Task did not complete - executor likely deadlocked", latch.await( 5, TimeUnit.SECONDS));
 176         assertNotNull("Expected exception thrown", caughtEx.get());
 177         assertEquals("Caught exception type", TestDeadlockException.class, caughtEx.get().getClass());
 178     }
 179
 180     @Test
 181     public void testListenableFutureCallbackWithExecutor() throws InterruptedException {
 182
 183         String listenerThreadPrefix = "ListenerThread";
 184         ExecutorService listenerExecutor = Executors.newFixedThreadPool(1,
 185                 new ThreadFactoryBuilder().setNameFormat(listenerThreadPrefix + "-%d").build());
 186
 187         executor = new DeadlockDetectingListeningExecutorService(
 188             Executors.newSingleThreadExecutor(new ThreadFactoryBuilder().setNameFormat("SingleThread").build()),
 189                 DEADLOCK_EXECUTOR_SUPPLIER, listenerExecutor);
 190
 191         try {
 192             testListenerCallback(executor, SUBMIT_CALLABLE, listenerThreadPrefix);
 193             testListenerCallback(executor, SUBMIT_RUNNABLE, listenerThreadPrefix);
 194             testListenerCallback(executor, SUBMIT_RUNNABLE_WITH_RESULT, listenerThreadPrefix);
 195         } finally {
 196             listenerExecutor.shutdownNow();
 197         }
 198     }
 199 }