1/**
2 * Copyright (C) 2006 Google Inc.
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.inject;
18
19
20import junit.framework.TestCase;
21
22import java.util.concurrent.CountDownLatch;
23import java.util.concurrent.atomic.AtomicReference;
24
25/**
26 * @author jessewilson@google.com (Jesse Wilson)
27 */
28
29public class BindingOrderTest extends TestCase {
30
31  public void testBindingOutOfOrder() {
32    Guice.createInjector(new AbstractModule() {
33      protected void configure() {
34        bind(BoundFirst.class);
35        bind(BoundSecond.class).to(BoundSecondImpl.class);
36      }
37    });
38  }
39
40  public static class BoundFirst {
41    @Inject public BoundFirst(BoundSecond boundSecond) { }
42  }
43
44  interface BoundSecond { }
45  static class BoundSecondImpl implements BoundSecond { }
46
47  public void testBindingOrderAndScopes() {
48    Injector injector = Guice.createInjector(new AbstractModule() {
49      protected void configure() {
50        bind(A.class);
51        bind(B.class).asEagerSingleton();
52      }
53    });
54
55    assertSame(injector.getInstance(A.class).b, injector.getInstance(A.class).b);
56  }
57
58  public void testBindingWithExtraThreads() throws InterruptedException {
59    final CountDownLatch ready = new CountDownLatch(1);
60    final CountDownLatch done = new CountDownLatch(1);
61    final AtomicReference<B> ref = new AtomicReference<B>();
62
63    final Object createsAThread = new Object() {
64      @Inject void createAnotherThread(final Injector injector) {
65        new Thread() {
66          public void run() {
67            ready.countDown();
68            A a = injector.getInstance(A.class);
69            ref.set(a.b);
70            done.countDown();
71          }
72        }.start();
73
74        // to encourage collisions, we make sure the other thread is running before returning
75        try {
76          ready.await();
77        } catch (InterruptedException e) {
78          throw new RuntimeException(e);
79        }
80      }
81    };
82
83    Guice.createInjector(new AbstractModule() {
84      protected void configure() {
85        requestInjection(createsAThread);
86        bind(A.class).toInstance(new A());
87      }
88    });
89
90    done.await();
91    assertNotNull(ref.get());
92  }
93
94  static class A {
95    @Inject B b;
96  }
97
98  static class B { }
99}
100