Fixed SPR-5920 by implementing GenericInterfaceDrivenDependencyInjectionAspect

org.springframework.aspects/src/main/java/org/springframework/beans/factory/aspectj/GenericInterfaceDrivenDependencyInjectionAspect.aj

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2002-2008 the original author or authors.
+ *
+ * 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 org.springframework.beans.factory.aspectj;
+
+/**
+ * Generic-based dependency injection aspect.
+ * <p> 
+ * This aspect allows users to implement efficient, type-safe dependency injection without 
+ * the use of the &#64;Configurable annotation.
+ * 
+ * The subaspect of this aspect doesn't need to include any AOP constructs. 
+ * For example, here is a subaspect that configures the <code>PricingStrategyClient</code> objects.
+ * <pre>
+ * aspect PricingStrategyDependencyInjectionAspect 
+ *        extends GenericInterfaceDrivenDependencyInjectionAspect<PricingStrategyClient> {
+ *     private PricingStrategy pricingStrategy;
+ *     
+ *     public void configure(PricingStrategyClient bean) { 
+ *         bean.setPricingStrategy(pricingStrategy); 
+ *     }
+ *     
+ *     public void setPricingStrategy(PricingStrategy pricingStrategy) { 
+ *         this.pricingStrategy = pricingStrategy; 
+ *     } 
+ * }
+ * </pre>
+ * @author Ramnivas Laddad
+ * @since 3.0.0
+ */
+public abstract aspect GenericInterfaceDrivenDependencyInjectionAspect<I> extends AbstractInterfaceDrivenDependencyInjectionAspect {
+    declare parents: I implements ConfigurableObject;
+           
+	public pointcut inConfigurableBean() : within(I+);
+	
+	public final void configureBean(Object bean) {
+		configure((I)bean);
+	}
+	
+	// Unfortunately, erasure used with generics won't allow to use the same named method 
+	protected abstract void configure(I bean);
+}

org.springframework.aspects/src/test/java/org/springframework/beans/factory/aspectj/BeanConfigurerTests.java

@@ -194,6 +194,13 @@ public class BeanConfigurerTests extends TestCase {
 		assertNotNull("Interface driven injection didn't occur for direct construction", testOrder.mailSender);
 	}
 
+	public void testGenericInterfaceDrivenDependencyInjection() {
+		PricingStrategy injectedPricingStrategy = new PricingStrategy();
+		PricingStrategyDependencyInjectionAspect.aspectOf().setPricingStrategy(injectedPricingStrategy);
+		LineItem testLineItem = new LineItem();
+		assertSame("Generic interface driven injection didn't occur for direct construction", injectedPricingStrategy, testLineItem.pricingStrategy);
+	}
+	
 	public void testInterfaceDrivenDependencyInjectionMultipleInterfaces() {
 		MailClientDependencyInjectionAspect.aspectOf().setMailSender(new JavaMailSenderImpl());
 		PaymentProcessorDependencyInjectionAspect.aspectOf().setPaymentProcessor(new PaymentProcessor());
@@ -509,6 +516,18 @@ public class BeanConfigurerTests extends TestCase {
 		}
 	}
 
+	private static aspect PricingStrategyDependencyInjectionAspect extends GenericInterfaceDrivenDependencyInjectionAspect<PricingStrategyClient> {
+		private PricingStrategy pricingStrategy;
+		
+		public void configure(PricingStrategyClient bean) {
+			bean.setPricingStrategy(pricingStrategy);
+		}
+		
+		public void setPricingStrategy(PricingStrategy pricingStrategy) {
+			this.pricingStrategy = pricingStrategy;
+		}
+	}
+	
 	public static interface MailSenderClient {
 		public void setMailSender(MailSender mailSender);
 	}
@@ -521,6 +540,22 @@ public class BeanConfigurerTests extends TestCase {
 		
 	}
 	
+	public static interface PricingStrategyClient {
+		public void setPricingStrategy(PricingStrategy pricingStrategy);
+	}
+	
+	public static class PricingStrategy {
+		
+	}
+	
+	public static class LineItem implements PricingStrategyClient {
+		private PricingStrategy pricingStrategy;
+		
+		public void setPricingStrategy(PricingStrategy pricingStrategy) {
+			this.pricingStrategy = pricingStrategy;
+		}
+	}
+	
 	public static class Order implements MailSenderClient, Serializable {
 		private transient MailSender mailSender;