AbstractIdleServiceTest.java revision 1d580d0f6ee4f21eb309ba7b509d2c6d671c4044 
1/*
2 * Copyright (C) 2009 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
17package com.google.common.util.concurrent;
18
19import com.google.common.util.concurrent.Service.State;
20
21import junit.framework.TestCase;
22
23import java.lang.Thread.UncaughtExceptionHandler;
24import java.util.concurrent.Executor;
25import java.util.concurrent.TimeUnit;
26import java.util.concurrent.TimeoutException;
27
28/**
29 * Unit test for {@link AbstractIdleService}.
30 *
31 * @author Chris Nokleberg
32 */
33public class AbstractIdleServiceTest extends TestCase {
34  private Thread executorThread;
35  private Throwable thrownByExecutorThread;
36  private final Executor executor = new Executor() {
37    @Override
38    public void execute(Runnable command) {
39      executorThread = new Thread(command);
40      executorThread.setUncaughtExceptionHandler(
41          new UncaughtExceptionHandler() {
42            @Override
43            public void uncaughtException(Thread thread, Throwable e) {
44              thrownByExecutorThread = e;
45            }
46          });
47      executorThread.start();
48    }
49  };
50
51  public void testServiceStartStop() throws Exception {
52    NullService service = new NullService();
53    assertFalse(service.startUpCalled);
54
55    service.start().get();
56    assertTrue(service.startUpCalled);
57    assertEquals(Service.State.RUNNING, service.state());
58
59    service.stop().get();
60    assertTrue(service.shutDownCalled);
61    assertEquals(Service.State.TERMINATED, service.state());
62    executorThread.join();
63    assertNull(thrownByExecutorThread);
64  }
65
66  public void testServiceToString() throws Exception {
67    NullService service = new NullService();
68    assertEquals("NullService [" + Service.State.NEW + "]", service.toString());
69    service.start().get();
70    assertEquals("NullService [" + Service.State.RUNNING + "]", service.toString());
71    service.stop().get();
72    assertEquals("NullService [" + Service.State.TERMINATED + "]", service.toString());
73  }
74
75  public void testTimeout() throws Exception {
76    // Create a service whose executor will never run its commands
77    Service service = new NullService() {
78      @Override protected Executor executor(Service.State state) {
79        return new Executor() {
80          @Override public void execute(Runnable command) {
81          }
82        };
83      }
84    };
85
86    try {
87      service.start().get(1, TimeUnit.MILLISECONDS);
88      fail("Expected timeout");
89    } catch (TimeoutException e) {
90      assertTrue(e.getMessage().contains(State.STARTING.toString()));
91    }
92  }
93
94  private class NullService extends AbstractIdleService {
95    boolean startUpCalled = false;
96    boolean shutDownCalled = false;
97    State expectedShutdownState = State.STOPPING;
98
99    @Override protected void startUp() {
100      assertFalse(startUpCalled);
101      assertFalse(shutDownCalled);
102      startUpCalled = true;
103      assertEquals(State.STARTING, state());
104    }
105
106    @Override protected void shutDown() {
107      assertTrue(startUpCalled);
108      assertFalse(shutDownCalled);
109      shutDownCalled = true;
110      assertEquals(expectedShutdownState, state());
111    }
112
113    @Override protected Executor executor(Service.State state) {
114      switch (state) {
115        case STARTING:
116          assertFalse(startUpCalled);
117          return executor;
118        case STOPPING:
119          assertTrue(startUpCalled);
120          assertFalse(shutDownCalled);
121          return executor;
122        default:
123          throw new IllegalStateException("unexpected state " + state);
124      }
125    }
126  }
127}
128