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Java example source code file (BindingOrderTest.java)

This example Java source code file (BindingOrderTest.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

abstractmodule, atomicreference, bindingordertest, boundfirst, boundsecond, boundsecondimpl, countdownlatch, inject, injector, interruptedexception, object, runtimeexception, testcase, threading, threads

The BindingOrderTest.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;


import junit.framework.TestCase;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicReference;

/**
 * @author jessewilson@google.com (Jesse Wilson)
 */

public class BindingOrderTest extends TestCase {

  public void testBindingOutOfOrder() {
    Guice.createInjector(new AbstractModule() {
      protected void configure() {
        bind(BoundFirst.class);
        bind(BoundSecond.class).to(BoundSecondImpl.class);
      }
    });
  }

  public static class BoundFirst {
    @Inject public BoundFirst(BoundSecond boundSecond) { }
  }

  interface BoundSecond { }
  static class BoundSecondImpl implements BoundSecond { }

  public void testBindingOrderAndScopes() {
    Injector injector = Guice.createInjector(new AbstractModule() {
      protected void configure() {
        bind(A.class);
        bind(B.class).asEagerSingleton();
      }
    });

    assertSame(injector.getInstance(A.class).b, injector.getInstance(A.class).b);
  }

  public void testBindingWithExtraThreads() throws InterruptedException {
    final CountDownLatch ready = new CountDownLatch(1);
    final CountDownLatch done = new CountDownLatch(1);
    final AtomicReference<B> ref = new AtomicReference();

    final Object createsAThread = new Object() {
      @Inject void createAnotherThread(final Injector injector) {
        new Thread() {
          public void run() {
            ready.countDown();
            A a = injector.getInstance(A.class);
            ref.set(a.b);
            done.countDown();
          }
        }.start();

        // to encourage collisions, we make sure the other thread is running before returning
        try {
          ready.await();
        } catch (InterruptedException e) {
          throw new RuntimeException(e);
        }
      }
    };

    Guice.createInjector(new AbstractModule() {
      protected void configure() {
        requestInjection(createsAThread);
        bind(A.class).toInstance(new A());
      }
    });

    done.await();
    assertNotNull(ref.get());
  }

  static class A {
    @Inject B b;
  }

  static class B { }
}

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