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Java example source code file (ProxyFactoryTest.java)

This example Java source code file (ProxyFactoryTest.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

annotation, constructionproxy, counter, countinginterceptor, doubleinterceptor, errorsexception, foo, invocationtargetexception, methodaspect, methodinterceptor, nosuchmethodexception, object, proxyfactory, reflection, simpleinterceptor, throwable, util

The ProxyFactoryTest.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.internal;

import static com.google.inject.matcher.Matchers.annotatedWith;
import static com.google.inject.matcher.Matchers.any;
import static com.google.inject.matcher.Matchers.not;
import static com.google.inject.matcher.Matchers.only;

import com.google.common.collect.Lists;
import com.google.inject.Inject;
import com.google.inject.spi.InjectionPoint;

import junit.framework.TestCase;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.reflect.InvocationTargetException;
import java.util.List;

/**
 * @author crazybob@google.com (Bob Lee)
 */
public class ProxyFactoryTest extends TestCase {

  List<MethodAspect> aspects = Lists.newArrayList();

  public void testSimpleCase()
      throws NoSuchMethodException, InvocationTargetException, ErrorsException {
    SimpleInterceptor interceptor = new SimpleInterceptor();
    InjectionPoint injectionPoint = InjectionPoint.forConstructorOf(Simple.class);

    aspects.add(new MethodAspect(any(), any(), interceptor));
    ProxyFactory<Simple> factory = new ProxyFactory(injectionPoint, aspects);

    ConstructionProxy<Simple> constructionProxy = factory.create();

    Simple simple = constructionProxy.newInstance();
    simple.invoke();
    assertTrue(simple.invoked);
    assertTrue(interceptor.invoked);
  }

  static class Simple {
    boolean invoked = false;
    public void invoke() {
      invoked = true;
    }
  }

  static class SimpleInterceptor implements MethodInterceptor {

    boolean invoked = false;

    public Object invoke(MethodInvocation methodInvocation) throws Throwable {
      invoked = true;
      return methodInvocation.proceed();
    }
  }

  public void testInterceptOneMethod()
      throws NoSuchMethodException, InvocationTargetException, ErrorsException {
    SimpleInterceptor interceptor = new SimpleInterceptor();

    aspects.add(new MethodAspect(only(Bar.class), annotatedWith(Intercept.class), interceptor));

    ConstructionProxy<Foo> fooFactory
        = new ProxyFactory<Foo>(InjectionPoint.forConstructorOf(Foo.class), aspects).create();
    ConstructionProxy<Bar> barFactory
        = new ProxyFactory<Bar>(InjectionPoint.forConstructorOf(Bar.class), aspects).create();

    Foo foo = fooFactory.newInstance();
    Bar bar = barFactory.newInstance();

    foo.foo();
    assertTrue(foo.fooCalled);
    assertFalse(interceptor.invoked);

    bar.bar();
    assertTrue(bar.barCalled);
    assertFalse(interceptor.invoked);

    bar.intercepted();
    assertTrue(bar.interceptedCalled);
    assertTrue(interceptor.invoked);
  }

  static class Foo {
    boolean fooCalled;
    @Intercept
    void foo() {
      fooCalled = true;
    }
  }

  static class Bar {

    boolean barCalled;
    void bar() {
      barCalled = true;
    }

    boolean interceptedCalled;

    @Intercept
    void intercepted() {
      interceptedCalled = true;
    }
  }

  @Retention(RetentionPolicy.RUNTIME)
  @interface Intercept {}

  public void testWithConstructorArguments()
      throws InvocationTargetException, NoSuchMethodException, ErrorsException {
    SimpleInterceptor interceptor = new SimpleInterceptor();

    aspects.add(new MethodAspect(any(), any(), interceptor));
    ProxyFactory<A> factory
        = new ProxyFactory<A>(InjectionPoint.forConstructorOf(A.class), aspects);

    ConstructionProxy<A> constructor = factory.create();

    A a = constructor.newInstance(5);
    a.a();
    assertEquals(5, a.i);
  }

  public void testNotProxied()
      throws NoSuchMethodException, InvocationTargetException, ErrorsException {
    SimpleInterceptor interceptor = new SimpleInterceptor();

    aspects.add(new MethodAspect(not(any()), not(any()), interceptor));
    ProxyFactory<A> factory
        = new ProxyFactory<A>(InjectionPoint.forConstructorOf(A.class), aspects);

    ConstructionProxy<A> constructor = factory.create();

    A a = constructor.newInstance(5);
    assertEquals(A.class, a.getClass());
  }

  static class A {
    final int i;
    @Inject public A(int i) {
      this.i = i;
    }
    public void a() {}
  }

  public void testMultipleInterceptors()
      throws NoSuchMethodException, InvocationTargetException, ErrorsException {
    DoubleInterceptor doubleInterceptor = new DoubleInterceptor();
    CountingInterceptor countingInterceptor = new CountingInterceptor();

    aspects.add(new MethodAspect(any(), any(), doubleInterceptor, countingInterceptor));
    ProxyFactory<Counter> factory
        = new ProxyFactory<Counter>(InjectionPoint.forConstructorOf(Counter.class), aspects);

    ConstructionProxy<Counter> constructor = factory.create();

    Counter counter = constructor.newInstance();
    counter.inc();
    assertEquals(2, counter.count);
    assertEquals(2, countingInterceptor.count);
  }

  static class CountingInterceptor implements MethodInterceptor {

    int count;

    public Object invoke(MethodInvocation methodInvocation) throws Throwable {
      count++;
      return methodInvocation.proceed();
    }
  }

  static class DoubleInterceptor implements MethodInterceptor {

    public Object invoke(MethodInvocation methodInvocation) throws Throwable {
      methodInvocation.proceed();
      return methodInvocation.proceed();
    }
  }

  static class Counter {
    int count;
    void inc() {
      count++;
    }
  }
}

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