Java example source code file (ClientServiceWithGuiceDefaults.java)

This example Java source code file (ClientServiceWithGuiceDefaults.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.

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Java - Java tags/keywords

client, clientservicewithguicedefaults, creationexception, inject, injector, mockservice, service, serviceimpl, singleton

The ClientServiceWithGuiceDefaults.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 com.google.inject.CreationException;
import com.google.inject.Guice;
import com.google.inject.ImplementedBy;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Singleton;

import junit.framework.Assert;

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

// 44 lines

@ImplementedBy(ServiceImpl.class)
public interface Service {
  void go();
}

@Singleton
public static class ServiceImpl implements ClientServiceWithGuiceDefaults.Service {
  public void go() {
    // ...
  }
}

public static class Client {

  private final Service service;

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

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

public void testClient() {
  MockService mock = new MockService();
  Client client = new Client(mock);
  client.go();
  Assert.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) throws CreationException {
  new ClientServiceWithGuiceDefaults().testClient();
  Injector injector = Guice.createInjector();
  Client client = injector.getProvider(Client.class).get();
}
}