/*
* Copyright 2007-2009 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 net.paoding.rose.web;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* TODO 目前是每个Module中都有一个指定interceptor的实例(或Delegate),
* 这个可能造成一些隐患,需要修改掉。
*
* @author 王志亮 [qieqie.wang@gmail.com]
*/
public class OncePerRequestInterceptorDelegate extends InterceptorDelegate {
private static Log logger = LogFactory.getLog(OncePerRequestInterceptorDelegate.class);
private final String filteredKey;
public OncePerRequestInterceptorDelegate(ControllerInterceptor interceptor) {
super(interceptor);
String realInterceptorName = getMostInnerInterceptor(interceptor).getClass().getName();
this.filteredKey = "$$paoding-rose.interceptor.oncePerRequest." + "." + realInterceptorName;
}
@Override
public Object roundInvocation(Invocation inv, InvocationChain chain) throws Exception {
Invocation tempInv = inv;
boolean tobeIntercepted; // true代表该执行拦截器,false代表不执行该拦截器而把流程交给下一个拦截器
int preCount = 0;
while (true) {
tobeIntercepted = (tempInv.getAttribute(filteredKey) == null);
if (!tobeIntercepted) {
if (logger.isDebugEnabled()) {
logger.debug(preCount + "-th preInvocation found filteredKey:" + filteredKey);
}
break;
}
tempInv = tempInv.getPreInvocation();
preCount ++;
if (logger.isDebugEnabled()) {
logger.debug(preCount + "-th preInvocation:" + tempInv);
}
if (tempInv == null) {
break;
}
}
if (tobeIntercepted) {
inv.setAttribute(filteredKey, Boolean.TRUE);
if (logger.isDebugEnabled()) {
logger.debug("do oncePerRequest interceptor.roundInvocation: " + getName());
}
return super.roundInvocation(inv, chain);
} else {
if (logger.isDebugEnabled()) {
logger.debug("skip oncePerRequest interceptor.roundInvocation: " + getName());
}
return chain.doNext();
}
}
@Override
public final void afterCompletion(Invocation inv, Throwable ex) throws Exception {
if (inv.getAttribute(filteredKey) != null) {
if (logger.isDebugEnabled()) {
logger.debug("do oncePerRequest interceptor.afterCompletion: " + getName());
}
super.afterCompletion(inv, ex);
} else {
if (logger.isDebugEnabled()) {
logger.debug("skip oncePerRequest interceptor.afterCompletion: " + getName());
}
}
}
@Override
public String toString() {
return "oncePerRequest." + this.interceptor.toString();
}
}