| /* |
| * Copyright (C) 2014 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.jdk8; |
| |
| import static java.lang.annotation.ElementType.METHOD; |
| import static java.lang.annotation.ElementType.TYPE; |
| import static java.lang.annotation.RetentionPolicy.RUNTIME; |
| |
| import com.google.inject.AbstractModule; |
| import com.google.inject.Guice; |
| import com.google.inject.Injector; |
| import com.google.inject.matcher.Matchers; |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.Target; |
| import java.util.concurrent.atomic.AtomicInteger; |
| import junit.framework.TestCase; |
| import org.aopalliance.intercept.MethodInterceptor; |
| |
| /** |
| * Tests for interception of default methods. |
| * |
| * @author [email protected] (Colin Decker) |
| */ |
| public class DefaultMethodInterceptionTest extends TestCase { |
| |
| private static final AtomicInteger callCount = new AtomicInteger(0); |
| private static final AtomicInteger interceptedCallCount = new AtomicInteger(0); |
| |
| // the interceptor's a lambda too |
| private final MethodInterceptor interceptor = |
| invocation -> { |
| interceptedCallCount.incrementAndGet(); |
| return invocation.proceed(); |
| }; |
| |
| @Override |
| protected void setUp() throws Exception { |
| callCount.set(0); |
| interceptedCallCount.set(0); |
| } |
| |
| @Retention(RUNTIME) |
| @Target({METHOD, TYPE}) |
| public @interface InterceptMe {} |
| |
| /** Interface with a default method annotated to be intercepted. */ |
| public interface Foo { |
| @InterceptMe |
| default String defaultMethod() { |
| callCount.incrementAndGet(); |
| return "Foo"; |
| } |
| } |
| |
| /** Foo implementation that does not override the default method. */ |
| public static class NonOverridingFoo implements Foo { |
| public String methodCallingDefault() { |
| return "NonOverriding-" + defaultMethod(); |
| } |
| } |
| |
| public void testInterceptedDefaultMethod() { |
| Injector injector = |
| Guice.createInjector( |
| new AbstractModule() { |
| @Override |
| protected void configure() { |
| bindInterceptor( |
| Matchers.any(), Matchers.annotatedWith(InterceptMe.class), interceptor); |
| bind(Foo.class).to(NonOverridingFoo.class); |
| } |
| }); |
| |
| Foo foo = injector.getInstance(Foo.class); |
| assertEquals("Foo", foo.defaultMethod()); |
| assertEquals(1, callCount.get()); |
| assertEquals(1, interceptedCallCount.get()); |
| } |
| |
| public void testInterceptedDefaultMethod_calledByAnotherMethod() { |
| Injector injector = |
| Guice.createInjector( |
| new AbstractModule() { |
| @Override |
| protected void configure() { |
| bindInterceptor( |
| Matchers.any(), Matchers.annotatedWith(InterceptMe.class), interceptor); |
| } |
| }); |
| |
| NonOverridingFoo foo = injector.getInstance(NonOverridingFoo.class); |
| assertEquals("NonOverriding-Foo", foo.methodCallingDefault()); |
| assertEquals(1, callCount.get()); |
| assertEquals(1, interceptedCallCount.get()); |
| } |
| |
| /** A base class defining a method with the same signature as Foo's default method. */ |
| public static class BaseClass { |
| // the definition of this method on the class will win over the default method |
| public String defaultMethod() { |
| callCount.incrementAndGet(); |
| return "BaseClass"; |
| } |
| } |
| |
| /** Foo implementation that should use superclass method rather than default method. */ |
| public static class InheritingFoo extends BaseClass implements Foo {} |
| |
| public void testInterceptedDefaultMethod_whenParentClassDefinesNonInterceptedMethod() { |
| Injector injector = |
| Guice.createInjector( |
| new AbstractModule() { |
| @Override |
| protected void configure() { |
| bindInterceptor( |
| Matchers.any(), Matchers.annotatedWith(InterceptMe.class), interceptor); |
| bind(Foo.class).to(InheritingFoo.class); |
| } |
| }); |
| |
| // the concrete implementation that wins is not annotated |
| Foo foo = injector.getInstance(Foo.class); |
| assertEquals("BaseClass", foo.defaultMethod()); |
| assertEquals(1, callCount.get()); |
| assertEquals(0, interceptedCallCount.get()); |
| } |
| |
| /** |
| * A base class defining an intercepted method with the same signature as Foo's default method. |
| */ |
| public static class BaseClass2 { |
| // the definition of this method on the class will win over the default method |
| @InterceptMe |
| public String defaultMethod() { |
| callCount.incrementAndGet(); |
| return "BaseClass2"; |
| } |
| } |
| |
| /** |
| * Foo implementation that should use intercepted superclass method rather than default method. |
| */ |
| public static class InheritingFoo2 extends BaseClass2 implements Foo {} |
| |
| public void testInterceptedDefaultMethod_whenParentClassDefinesInterceptedMethod() { |
| Injector injector = |
| Guice.createInjector( |
| new AbstractModule() { |
| @Override |
| protected void configure() { |
| bindInterceptor( |
| Matchers.any(), Matchers.annotatedWith(InterceptMe.class), interceptor); |
| bind(Foo.class).to(InheritingFoo2.class); |
| } |
| }); |
| |
| // the concrete implementation that wins is not annotated |
| Foo foo = injector.getInstance(Foo.class); |
| assertEquals("BaseClass2", foo.defaultMethod()); |
| assertEquals(1, callCount.get()); |
| assertEquals(1, interceptedCallCount.get()); |
| } |
| |
| public interface Baz { |
| default String doSomething() { |
| return "Baz"; |
| } |
| |
| String doSomethingElse(); |
| } |
| |
| public static class BazImpl implements Baz { |
| |
| @Override |
| public String doSomethingElse() { |
| return "BazImpl"; |
| } |
| } |
| |
| public void testInterception_ofAllMethodsOnType() { |
| Injector injector = |
| Guice.createInjector( |
| new AbstractModule() { |
| @Override |
| protected void configure() { |
| bindInterceptor(Matchers.subclassesOf(Baz.class), Matchers.any(), interceptor); |
| bind(Baz.class).to(BazImpl.class); |
| } |
| }); |
| |
| Baz baz = injector.getInstance(Baz.class); |
| |
| assertEquals("Baz", baz.doSomething()); |
| assertEquals("BazImpl", baz.doSomethingElse()); |
| |
| assertEquals(2, interceptedCallCount.get()); |
| } |
| |
| public void testInterception_ofAllMethodsOnType_interceptsInheritedDefaultMethod() { |
| Injector injector = |
| Guice.createInjector( |
| new AbstractModule() { |
| @Override |
| protected void configure() { |
| bindInterceptor(Matchers.subclassesOf(BazImpl.class), Matchers.any(), interceptor); |
| bind(Baz.class).to(BazImpl.class); |
| } |
| }); |
| |
| Baz baz = injector.getInstance(Baz.class); |
| |
| assertEquals("Baz", baz.doSomething()); |
| assertEquals("BazImpl", baz.doSomethingElse()); |
| |
| assertEquals(2, interceptedCallCount.get()); |
| } |
| } |