| /** |
| * Copyright (C) 2008 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 com.google.inject.internal.util.ImmutableList; |
| import com.google.inject.internal.util.ImmutableMap; |
| import com.google.inject.internal.util.Iterables; |
| import com.google.inject.matcher.Matchers; |
| import static com.google.inject.matcher.Matchers.only; |
| import com.google.inject.spi.ConstructorBinding; |
| import java.lang.reflect.Method; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.concurrent.atomic.AtomicInteger; |
| import java.util.concurrent.atomic.AtomicReference; |
| import junit.framework.TestCase; |
| import org.aopalliance.intercept.MethodInterceptor; |
| import org.aopalliance.intercept.MethodInvocation; |
| |
| /** |
| * @author jessewilson@google.com (Jesse Wilson) |
| */ |
| public class MethodInterceptionTest extends TestCase { |
| |
| private AtomicInteger count = new AtomicInteger(); |
| |
| private final class CountingInterceptor implements MethodInterceptor { |
| public Object invoke(MethodInvocation methodInvocation) throws Throwable { |
| count.incrementAndGet(); |
| return methodInvocation.proceed(); |
| } |
| } |
| |
| private final class ReturnNullInterceptor implements MethodInterceptor { |
| public Object invoke(MethodInvocation methodInvocation) throws Throwable { |
| return null; |
| } |
| } |
| |
| private final class NoOpInterceptor implements MethodInterceptor { |
| public Object invoke(MethodInvocation methodInvocation) throws Throwable { |
| return methodInvocation.proceed(); |
| } |
| } |
| |
| public void testSharedProxyClasses() { |
| Injector injector = Guice.createInjector(new AbstractModule() { |
| protected void configure() { |
| bindInterceptor(Matchers.any(), Matchers.returns(only(Foo.class)), |
| new ReturnNullInterceptor()); |
| } |
| }); |
| |
| Injector childOne = injector.createChildInjector(new AbstractModule() { |
| protected void configure() { |
| bind(Interceptable.class); |
| } |
| }); |
| |
| Interceptable nullFoosOne = childOne.getInstance(Interceptable.class); |
| assertNotNull(nullFoosOne.bar()); |
| assertNull(nullFoosOne.foo()); |
| |
| Injector childTwo = injector.createChildInjector(new AbstractModule() { |
| protected void configure() { |
| bind(Interceptable.class); |
| } |
| }); |
| |
| Interceptable nullFoosTwo = childTwo.getInstance(Interceptable.class); |
| assertNull(nullFoosTwo.foo()); |
| |
| assertSame("Child injectors should share proxy classes, otherwise memory leaks!", |
| nullFoosOne.getClass(), nullFoosTwo.getClass()); |
| } |
| |
| public void testGetThis() { |
| final AtomicReference<Object> lastTarget = new AtomicReference<Object>(); |
| |
| Injector injector = Guice.createInjector(new AbstractModule() { |
| protected void configure() { |
| bindInterceptor(Matchers.any(), Matchers.any(), new MethodInterceptor() { |
| public Object invoke(MethodInvocation methodInvocation) throws Throwable { |
| lastTarget.set(methodInvocation.getThis()); |
| return methodInvocation.proceed(); |
| } |
| }); |
| } |
| }); |
| |
| Interceptable interceptable = injector.getInstance(Interceptable.class); |
| interceptable.foo(); |
| assertSame(interceptable, lastTarget.get()); |
| } |
| |
| public void testInterceptingFinalClass() { |
| Injector injector = Guice.createInjector(new AbstractModule() { |
| protected void configure() { |
| bindInterceptor(Matchers.any(), Matchers.any(), new MethodInterceptor() { |
| public Object invoke(MethodInvocation methodInvocation) throws Throwable { |
| return methodInvocation.proceed(); |
| } |
| }); |
| } |
| }); |
| try { |
| injector.getInstance(NotInterceptable.class); |
| fail(); |
| } catch(ConfigurationException ce) { |
| assertEquals("Unable to method intercept: " + NotInterceptable.class.getName(), |
| Iterables.getOnlyElement(ce.getErrorMessages()).getMessage().toString()); |
| assertEquals("Cannot subclass final class class " + NotInterceptable.class.getName(), |
| ce.getCause().getMessage()); |
| } |
| } |
| |
| public void testSpiAccessToInterceptors() throws NoSuchMethodException { |
| final MethodInterceptor countingInterceptor = new CountingInterceptor(); |
| final MethodInterceptor returnNullInterceptor = new ReturnNullInterceptor(); |
| Injector injector = Guice.createInjector(new AbstractModule() { |
| protected void configure() { |
| bindInterceptor(Matchers.any(),Matchers.returns(only(Foo.class)), |
| countingInterceptor); |
| bindInterceptor(Matchers.any(), Matchers.returns(only(Foo.class).or(only(Bar.class))), |
| returnNullInterceptor); |
| } |
| }); |
| |
| ConstructorBinding<?> interceptedBinding |
| = (ConstructorBinding<?>) injector.getBinding(Interceptable.class); |
| Method barMethod = Interceptable.class.getMethod("bar"); |
| Method fooMethod = Interceptable.class.getMethod("foo"); |
| assertEquals(ImmutableMap.<Method, List<MethodInterceptor>>of( |
| fooMethod, ImmutableList.of(countingInterceptor, returnNullInterceptor), |
| barMethod, ImmutableList.of(returnNullInterceptor)), |
| interceptedBinding.getMethodInterceptors()); |
| |
| ConstructorBinding<?> nonInterceptedBinding |
| = (ConstructorBinding<?>) injector.getBinding(Foo.class); |
| assertEquals(ImmutableMap.<Method, List<MethodInterceptor>>of(), |
| nonInterceptedBinding.getMethodInterceptors()); |
| |
| injector.getInstance(Interceptable.class).foo(); |
| assertEquals("expected counting interceptor to be invoked first", 1, count.get()); |
| } |
| |
| public void testInterceptedMethodThrows() throws Exception { |
| Injector injector = Guice.createInjector(new AbstractModule() { |
| protected void configure() { |
| bindInterceptor(Matchers.any(), Matchers.any(), new CountingInterceptor()); |
| bindInterceptor(Matchers.any(), Matchers.any(), new CountingInterceptor()); |
| } |
| }); |
| |
| Interceptable interceptable = injector.getInstance(Interceptable.class); |
| try { |
| interceptable.explode(); |
| fail(); |
| } catch (Exception e) { |
| // validate all causes. |
| for (Throwable t = e; t != null; t = e.getCause()) { |
| StackTraceElement[] stackTraceElement = t.getStackTrace(); |
| assertEquals("explode", stackTraceElement[0].getMethodName()); |
| assertEquals("invoke", stackTraceElement[1].getMethodName()); |
| assertEquals("invoke", stackTraceElement[2].getMethodName()); |
| assertEquals("testInterceptedMethodThrows", stackTraceElement[3].getMethodName()); |
| } |
| } |
| } |
| |
| public void testNotInterceptedMethodsInInterceptedClassDontAddFrames() { |
| Injector injector = Guice.createInjector(new AbstractModule() { |
| protected void configure() { |
| bindInterceptor(Matchers.any(), Matchers.returns(only(Foo.class)), |
| new NoOpInterceptor()); |
| } |
| }); |
| |
| Interceptable interceptable = injector.getInstance(Interceptable.class); |
| assertNull(interceptable.lastElements); |
| interceptable.foo(); |
| boolean cglibFound = false; |
| for (int i = 0; i < interceptable.lastElements.length; i++) { |
| if (interceptable.lastElements[i].toString().contains("cglib")) { |
| cglibFound = true; |
| break; |
| } |
| } |
| assertTrue(Arrays.asList(interceptable.lastElements).toString(), cglibFound); |
| cglibFound = false; |
| |
| interceptable.bar(); |
| for (int i = 0; i < interceptable.lastElements.length; i++) { |
| if (interceptable.lastElements[i].toString().contains("cglib")) { |
| cglibFound = true; |
| break; |
| } |
| } |
| assertFalse(Arrays.asList(interceptable.lastElements).toString(), cglibFound); |
| } |
| |
| static class Foo {} |
| static class Bar {} |
| |
| public static class Interceptable { |
| StackTraceElement[] lastElements; |
| |
| public Foo foo() { |
| lastElements = Thread.currentThread().getStackTrace(); |
| return new Foo() {}; |
| } |
| public Bar bar() { |
| lastElements = Thread.currentThread().getStackTrace(); |
| return new Bar() {}; |
| } |
| public String explode() throws Exception { |
| lastElements = Thread.currentThread().getStackTrace(); |
| throw new Exception("kaboom!", new RuntimeException("boom!")); |
| } |
| } |
| |
| public static final class NotInterceptable {} |
| } |