retryaspect.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.autoproxy;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;

/**
 * @author Rob Harrop
 * @since 2.0
 */
@Aspect
public class RetryAspect {

	private int beginCalls;

	private int commitCalls;

	private int rollbackCalls;

	@Pointcut("execution(public * UnreliableBean.*(..))")
	public void execOfPublicMethod() {
	}

	/**
	 * Retry Advice
	 */
	@Around("execOfPublicMethod()")
	public Object retry(ProceedingJoinPoint jp) throws Throwable {
		boolean retry = true;
		Object o = null;

		while (retry) {
			try {
				retry = false;
				o = jp.proceed();
			}
			catch (RetryableException re) {
				retry = true;
			}
		}

		return o;
	}

	/**
	 * Just simulating TransactionInterceptor, could be anything else
	 */
	@Around("execOfPublicMethod()")
	public Object transaction(ProceedingJoinPoint jp) throws Throwable {
		Object o = null;

		this.beginCalls++;
		try {
			o = jp.proceed();
			this.commitCalls++;
		}
		catch (RetryableException e) {
			this.rollbackCalls++;
			throw e;
		}

		return o;
	}


	public int getBeginCalls() {
		return beginCalls;
	}

	public int getCommitCalls() {
		return commitCalls;
	}

	public int getRollbackCalls() {
		return rollbackCalls;
	}

}