1 /* 2 * Copyright (C) 2014 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.inject.jdk8; 18 19 import static java.lang.annotation.ElementType.METHOD; 20 import static java.lang.annotation.ElementType.TYPE; 21 import static java.lang.annotation.RetentionPolicy.RUNTIME; 22 23 import com.google.inject.AbstractModule; 24 import com.google.inject.Guice; 25 import com.google.inject.Injector; 26 import com.google.inject.matcher.Matchers; 27 import java.lang.annotation.Retention; 28 import java.lang.annotation.Target; 29 import java.util.concurrent.atomic.AtomicInteger; 30 import junit.framework.TestCase; 31 import org.aopalliance.intercept.MethodInterceptor; 32 33 /** 34 * Tests for interception of default methods. 35 * 36 * @author cgdecker@google.com (Colin Decker) 37 */ 38 public class DefaultMethodInterceptionTest extends TestCase { 39 40 private static final AtomicInteger callCount = new AtomicInteger(0); 41 private static final AtomicInteger interceptedCallCount = new AtomicInteger(0); 42 43 // the interceptor's a lambda too 44 private final MethodInterceptor interceptor = 45 invocation -> { 46 interceptedCallCount.incrementAndGet(); 47 return invocation.proceed(); 48 }; 49 50 @Override setUp()51 protected void setUp() throws Exception { 52 callCount.set(0); 53 interceptedCallCount.set(0); 54 } 55 56 @Retention(RUNTIME) 57 @Target({METHOD, TYPE}) 58 public @interface InterceptMe {} 59 60 /** Interface with a default method annotated to be intercepted. */ 61 public interface Foo { 62 @InterceptMe defaultMethod()63 default String defaultMethod() { 64 callCount.incrementAndGet(); 65 return "Foo"; 66 } 67 } 68 69 /** Foo implementation that does not override the default method. */ 70 public static class NonOverridingFoo implements Foo { methodCallingDefault()71 public String methodCallingDefault() { 72 return "NonOverriding-" + defaultMethod(); 73 } 74 } 75 testInterceptedDefaultMethod()76 public void testInterceptedDefaultMethod() { 77 Injector injector = 78 Guice.createInjector( 79 new AbstractModule() { 80 @Override 81 protected void configure() { 82 bindInterceptor( 83 Matchers.any(), Matchers.annotatedWith(InterceptMe.class), interceptor); 84 bind(Foo.class).to(NonOverridingFoo.class); 85 } 86 }); 87 88 Foo foo = injector.getInstance(Foo.class); 89 assertEquals("Foo", foo.defaultMethod()); 90 assertEquals(1, callCount.get()); 91 assertEquals(1, interceptedCallCount.get()); 92 } 93 testInterceptedDefaultMethod_calledByAnotherMethod()94 public void testInterceptedDefaultMethod_calledByAnotherMethod() { 95 Injector injector = 96 Guice.createInjector( 97 new AbstractModule() { 98 @Override 99 protected void configure() { 100 bindInterceptor( 101 Matchers.any(), Matchers.annotatedWith(InterceptMe.class), interceptor); 102 } 103 }); 104 105 NonOverridingFoo foo = injector.getInstance(NonOverridingFoo.class); 106 assertEquals("NonOverriding-Foo", foo.methodCallingDefault()); 107 assertEquals(1, callCount.get()); 108 assertEquals(1, interceptedCallCount.get()); 109 } 110 111 /** A base class defining a method with the same signature as Foo's default method. */ 112 public static class BaseClass { 113 // the definition of this method on the class will win over the default method defaultMethod()114 public String defaultMethod() { 115 callCount.incrementAndGet(); 116 return "BaseClass"; 117 } 118 } 119 120 /** Foo implementation that should use superclass method rather than default method. */ 121 public static class InheritingFoo extends BaseClass implements Foo {} 122 testInterceptedDefaultMethod_whenParentClassDefinesNonInterceptedMethod()123 public void testInterceptedDefaultMethod_whenParentClassDefinesNonInterceptedMethod() { 124 Injector injector = 125 Guice.createInjector( 126 new AbstractModule() { 127 @Override 128 protected void configure() { 129 bindInterceptor( 130 Matchers.any(), Matchers.annotatedWith(InterceptMe.class), interceptor); 131 bind(Foo.class).to(InheritingFoo.class); 132 } 133 }); 134 135 // the concrete implementation that wins is not annotated 136 Foo foo = injector.getInstance(Foo.class); 137 assertEquals("BaseClass", foo.defaultMethod()); 138 assertEquals(1, callCount.get()); 139 assertEquals(0, interceptedCallCount.get()); 140 } 141 142 /** 143 * A base class defining an intercepted method with the same signature as Foo's default method. 144 */ 145 public static class BaseClass2 { 146 // the definition of this method on the class will win over the default method 147 @InterceptMe defaultMethod()148 public String defaultMethod() { 149 callCount.incrementAndGet(); 150 return "BaseClass2"; 151 } 152 } 153 154 /** 155 * Foo implementation that should use intercepted superclass method rather than default method. 156 */ 157 public static class InheritingFoo2 extends BaseClass2 implements Foo {} 158 testInterceptedDefaultMethod_whenParentClassDefinesInterceptedMethod()159 public void testInterceptedDefaultMethod_whenParentClassDefinesInterceptedMethod() { 160 Injector injector = 161 Guice.createInjector( 162 new AbstractModule() { 163 @Override 164 protected void configure() { 165 bindInterceptor( 166 Matchers.any(), Matchers.annotatedWith(InterceptMe.class), interceptor); 167 bind(Foo.class).to(InheritingFoo2.class); 168 } 169 }); 170 171 // the concrete implementation that wins is not annotated 172 Foo foo = injector.getInstance(Foo.class); 173 assertEquals("BaseClass2", foo.defaultMethod()); 174 assertEquals(1, callCount.get()); 175 assertEquals(1, interceptedCallCount.get()); 176 } 177 178 public interface Baz { doSomething()179 default String doSomething() { 180 return "Baz"; 181 } 182 doSomethingElse()183 String doSomethingElse(); 184 } 185 186 public static class BazImpl implements Baz { 187 188 @Override doSomethingElse()189 public String doSomethingElse() { 190 return "BazImpl"; 191 } 192 } 193 testInterception_ofAllMethodsOnType()194 public void testInterception_ofAllMethodsOnType() { 195 Injector injector = 196 Guice.createInjector( 197 new AbstractModule() { 198 @Override 199 protected void configure() { 200 bindInterceptor(Matchers.subclassesOf(Baz.class), Matchers.any(), interceptor); 201 bind(Baz.class).to(BazImpl.class); 202 } 203 }); 204 205 Baz baz = injector.getInstance(Baz.class); 206 207 assertEquals("Baz", baz.doSomething()); 208 assertEquals("BazImpl", baz.doSomethingElse()); 209 210 assertEquals(2, interceptedCallCount.get()); 211 } 212 testInterception_ofAllMethodsOnType_interceptsInheritedDefaultMethod()213 public void testInterception_ofAllMethodsOnType_interceptsInheritedDefaultMethod() { 214 Injector injector = 215 Guice.createInjector( 216 new AbstractModule() { 217 @Override 218 protected void configure() { 219 bindInterceptor(Matchers.subclassesOf(BazImpl.class), Matchers.any(), interceptor); 220 bind(Baz.class).to(BazImpl.class); 221 } 222 }); 223 224 Baz baz = injector.getInstance(Baz.class); 225 226 assertEquals("Baz", baz.doSomething()); 227 assertEquals("BazImpl", baz.doSomethingElse()); 228 229 assertEquals(2, interceptedCallCount.get()); 230 } 231 } 232