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Java example source code file (ClientServiceWithDependencyInjection.java)

This example Java source code file (ClientServiceWithDependencyInjection.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

client, clientfactory, clientservicewithdependencyinjection, mockservice, service, servicefactory, serviceimpl

The ClientServiceWithDependencyInjection.java Java example source code

/**
 * Copyright (C) 2006 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.example;

import static junit.framework.Assert.assertTrue;

/**
 * @author crazybob@google.com (Bob Lee)
 */
public class ClientServiceWithDependencyInjection {

// 62 lines

public interface Service {
  void go();
}

public static class ServiceImpl implements ClientServiceWithDependencyInjection.Service {
  public void go() {
    // ...
  }
}

public static class ServiceFactory {

  private ServiceFactory() {}

  private static final Service service = new ServiceImpl();

  public static Service getInstance() {
    return service;
  }
}

public static class Client {

  private final Service service;

  public Client(Service service) {
    this.service = service;
  }

  public void go() {
    service.go();
  }
}

public static class ClientFactory {

  private ClientFactory() {}

  public static Client getInstance() {
    Service service = ServiceFactory.getInstance();
    return new Client(service);
  }
}

public void testClient() {
  MockService mock = new MockService();
  Client client = new Client(mock);
  client.go();
  assertTrue(mock.isGone());
}

public static class MockService implements Service {

  private boolean gone = false;

  public void go() {
    gone = true;
  }

  public boolean isGone() {
    return gone;
  }
}

  public static void main(String[] args) {
    new ClientServiceWithDependencyInjection().testClient();
  }
}

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