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      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 
     17 package com.google.inject.example;
     18 
     19 import static junit.framework.Assert.assertTrue;
     20 
     21 import com.google.inject.AbstractModule;
     22 import com.google.inject.CreationException;
     23 import com.google.inject.Guice;
     24 import com.google.inject.Inject;
     25 import com.google.inject.Injector;
     26 import com.google.inject.Scopes;
     27 
     28 /**
     29  * @author crazybob (at) google.com (Bob Lee)
     30  */
     31 public class ClientServiceWithGuice {
     32 
     33 // 48 lines
     34 
     35 public interface Service {
     36   void go();
     37 }
     38 
     39 public static class ServiceImpl implements Service {
     40   public void go() {
     41     // ...
     42   }
     43 }
     44 
     45 public static class MyModule extends AbstractModule {
     46   protected void configure() {
     47     bind(Service.class).to(ServiceImpl.class).in(Scopes.SINGLETON);
     48   }
     49 }
     50 
     51 public static class Client {
     52 
     53   private final Service service;
     54 
     55   @Inject
     56   public Client(Service service) {
     57     this.service = service;
     58   }
     59 
     60   public void go() {
     61     service.go();
     62   }
     63 }
     64 
     65 public void testClient() {
     66   MockService mock = new MockService();
     67   Client client = new Client(mock);
     68   client.go();
     69   assertTrue(mock.isGone());
     70 }
     71 
     72 public static class MockService implements Service {
     73 
     74   private boolean gone = false;
     75 
     76   public void go() {
     77     gone = true;
     78   }
     79 
     80   public boolean isGone() {
     81     return gone;
     82   }
     83 }
     84 
     85 public static void main(String[] args) throws CreationException {
     86   new ClientServiceWithGuice().testClient();
     87   Injector injector = Guice.createInjector(new MyModule());
     88   Client client = injector.getInstance(Client.class);
     89 }
     90 }
     91