makelockable.java

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/*
 * Copyright 2002-2006 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.aop.aspectj.annotation;

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.DeclareParents;
import org.springframework.aop.framework.DefaultLockable;
import org.springframework.aop.framework.Lockable;

/**
 * Demonstrates introductions, AspectJ annotation style.
 * <p>
 * @author Rod Johnson
 * @since 2.0
 */
@Aspect
public class MakeLockable {
	
	@DeclareParents(value = "org.springframework..*",
			defaultImpl=DefaultLockable.class)
	public static Lockable mixin;
	
	@Before(value="execution(void set*(*)) && this(mixin)", argNames="mixin")
	public void checkNotLocked(
		Lockable mixin)  // Bind to arg
	{
		// Can also obtain the mixin (this) this way
		//Lockable mixin = (Lockable) jp.getThis();
		if (mixin.locked()) {
			throw new IllegalStateException();
		}
	}

}

/*
 * 
 * public aspect MakeLockable {
 *   
 *  declare parents org....* implements Lockable;
 *   
 *  private boolean Lockable.locked;
	
 *	public void Lockable.lock() {
		this.locked = true;
	}
	
 *	public void Lockable.unlock() {
		this.locked = false;
	}
	
 *	public boolean Lockable.locked() {
		return this.locked;
	}
 * 
 * 
 * }
 */