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Spring Framework example source code file (AbstractDependencyInjectionAspect.aj)

This example Spring Framework source code file (AbstractDependencyInjectionAspect.aj) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Spring Framework tags/keywords

abstractdependencyinjectionaspect, abstractdependencyinjectionaspect, suppressajwarnings, suppressajwarnings

The Spring Framework AbstractDependencyInjectionAspect.aj source code

/*
 * 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;

import org.aspectj.lang.annotation.SuppressAjWarnings;

/**
 * Abstract base aspect that can perform Dependency
 * Injection on objects, however they may be created.
 * 
 * @author Ramnivas Laddad
 * @since 2.5.2
 */
public abstract aspect AbstractDependencyInjectionAspect {
	/**
	 * Select construction join points for objects to inject dependencies
	 */
	public abstract pointcut beanConstruction(Object bean); 

	/**
	 * Select deserialization join points for objects to inject dependencies
	 */
	public abstract pointcut beanDeserialization(Object bean);
	
	/**
	 * Select join points in a configurable bean
	 */
	public abstract pointcut inConfigurableBean();
	
	/**
	 * Select join points in beans to be configured prior to construction?
	 * By default, use post-construction injection matching the default in the Configurable annotation.
	 */
	public pointcut preConstructionConfiguration() : if(false);
	
	/**
	 * Select the most-specific initialization join point 
	 * (most concrete class) for the initialization of an instance.
	 */
	public pointcut mostSpecificSubTypeConstruction() :
		if(thisJoinPoint.getSignature().getDeclaringType() == thisJoinPoint.getThis().getClass());

	/**
	 * Select least specific super type that is marked for DI (so that injection occurs only once with pre-construction inejection
	 */
	public abstract pointcut leastSpecificSuperTypeConstruction();
		
	/**
	 * Configure the bean
	 */
	public abstract void configureBean(Object bean);

	
	private pointcut preConstructionCondition() : 
		leastSpecificSuperTypeConstruction() && preConstructionConfiguration();
	
	private pointcut postConstructionCondition() :
		mostSpecificSubTypeConstruction() && !preConstructionConfiguration();
	
	/**
	 * Pre-construction configuration.
	 */
	@SuppressAjWarnings("adviceDidNotMatch")
	before(Object bean) : 
		beanConstruction(bean) && preConstructionCondition() && inConfigurableBean()  { 
		configureBean(bean);
	}

	/**
	 * Post-construction configuration.
	 */
	@SuppressAjWarnings("adviceDidNotMatch")
	after(Object bean) returning : 
		beanConstruction(bean) && postConstructionCondition() && inConfigurableBean() {
		configureBean(bean);
	}
	
	/**
	 * Post-deserialization configuration.
	 */
	@SuppressAjWarnings("adviceDidNotMatch")
	after(Object bean) returning : 
		beanDeserialization(bean) && inConfigurableBean() {
		configureBean(bean);
	}
	
}

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