/**************************************************************************************
* Copyright (c) Jonas Bon�r, Alexandre Vasseur. All rights reserved. *
* http://aspectwerkz.codehaus.org *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the LGPL license *
* a copy of which has been included with this distribution in the license.txt file. *
**************************************************************************************/
package org.codehaus.aspectwerkz.joinpoint.management;
import org.codehaus.aspectwerkz.IndexTuple;
import org.codehaus.aspectwerkz.aspect.AspectContainer;
import java.io.Serializable;
/**
* Handles the execution of the around advices.
*
* @author <a href="mailto:jboner@codehaus.org">Jonas Bon�r</a>
* @author <a href="mailto:alex@gnilux.com">Alexandre Vasseur</a>
*/
public class AroundAdviceExecutor implements Serializable {
/**
* The index of the current advice.
*/
private int m_currentAdviceIndex = -1;
/**
* The stack index.
*/
private int m_stackIndex = -1;
/**
* The advices indexes.
*/
private final IndexTuple[] m_adviceIndexes;
/**
* The join point type.
*/
private final int m_joinPointType;
/**
* Creates a new around advice executor.
*
* @param adviceIndexes
* @param joinPointType
*/
public AroundAdviceExecutor(final IndexTuple[] adviceIndexes, final int joinPointType) {
m_adviceIndexes = adviceIndexes;
m_joinPointType = joinPointType;
}
/**
* Executes its advices one by one. After the last advice has been executed, the original method is invoked.
*
* @param joinPoint the current join point
* @return the result from the next advice in the chain or the invocation of the target method
*/
public Object proceed(final JoinPointBase joinPoint) throws Throwable {
// if we have cflow advice then let it run first, then check if we are in cflow
if (!joinPoint.isInCflow()) {
return JoinPointBase.invokeJoinPoint(joinPoint, m_joinPointType);
}
m_stackIndex++;
try {
if (m_stackIndex == 0) {
if (joinPoint.m_beforeAdviceExecutor.hasAdvices()) {
joinPoint.m_beforeAdviceExecutor.proceed(joinPoint);
}
}
Object result = null;
if (m_currentAdviceIndex == (m_adviceIndexes.length - 1)) {
m_currentAdviceIndex = -1;
try {
result = JoinPointBase.invokeJoinPoint(joinPoint, m_joinPointType);
} finally {
m_currentAdviceIndex = m_adviceIndexes.length - 1;
}
} else {
m_currentAdviceIndex++;
try {
IndexTuple index = m_adviceIndexes[m_currentAdviceIndex];
AspectContainer container = index.getAspectManager().getAspectContainer(index.getAspectIndex());
result = container.invokeAdvice(index.getMethodIndex(), joinPoint);
} finally {
m_currentAdviceIndex--;
}
}
if (m_stackIndex == 0) {
if (joinPoint.m_afterAdviceExecutor.hasAdvices()) {
joinPoint.m_afterAdviceExecutor.proceed(joinPoint);
}
}
return result;
} finally {
m_stackIndex--;
}
}
/**
* Checks if the executor has any advices.
*
* @return true if it has advices
*/
public boolean hasAdvices() {
return m_adviceIndexes.length != 0;
}
/**
* Resets the invocation flow.
* <p/>
* Will restart the execution chain of advice.
*/
public void reset() {
m_currentAdviceIndex = -1;
m_stackIndex = -1;
}
}