| /** |
| * Copyright (C) 2008 Google Inc. |
| * |
| * Licensed 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 com.google.inject; |
| |
| import junit.framework.TestCase; |
| |
| /** |
| * @author jessewilson@google.com (Jesse Wilson) |
| */ |
| public class EagerSingletonTest extends TestCase { |
| |
| public void testJustInTimeEagerSingletons() { |
| A.instanceCount = 0; |
| B.instanceCount = 0; |
| C.instanceCount = 0; |
| Guice.createInjector(Stage.PRODUCTION, new AbstractModule() { |
| protected void configure() { |
| // create a just-in-time binding for A |
| getProvider(A.class); |
| |
| // create a just-in-time binding for C |
| requestInjection(new Object() { |
| @Inject void inject(Injector injector) { |
| injector.getInstance(C.class); |
| } |
| }); |
| } |
| }); |
| |
| assertEquals(1, A.instanceCount); |
| assertEquals("Singletons discovered when creating singletons should not be built eagerly", |
| 0, B.instanceCount); |
| assertEquals(1, C.instanceCount); |
| } |
| |
| @Singleton |
| static class A { |
| static int instanceCount = 0; |
| int instanceId = instanceCount++; |
| |
| @Inject A(Injector injector) { |
| injector.getProvider(B.class); |
| } |
| } |
| |
| @Singleton |
| static class B { |
| static int instanceCount = 0; |
| int instanceId = instanceCount++; |
| } |
| |
| @Singleton |
| static class C { |
| static int instanceCount = 0; |
| int instanceId = instanceCount++; |
| } |
| } |