/**
* Removes the log message from the Log4J NDC when the processing thread is exited after the start
* of asynchronous request handling.
*/
@Override
public void afterConcurrentHandlingStarted(WebRequest request) {
NDC.pop();
if (NDC.getDepth() == 0) {
NDC.remove();
}
}
/** Removes the log message from the Log4J NDC after the request is processed. */
@Override
public void afterCompletion(WebRequest request, Exception ex) throws Exception {
NDC.pop();
if (NDC.getDepth() == 0) {
NDC.remove();
}
}
@Override
public final void execute() throws BuildException {
if (NDC.getDepth() <= 0) {
NDC.push(_groupName);
}
validate();
doExecute(createEc2());
}
/*(non-Javadoc)
* @see org.apache.log4j.AppenderSkeleton#append(org.apache.log4j.spi.LoggingEvent)
*/
protected void append(LoggingEvent event) {
String ndcStr = null;
int depth = -1;
{ // IMPORTANT: this section is something MUST be called!
ndcStr = event.getNDC();
depth = NDC.getDepth();
event.getThreadName();
// Get a copy of this thread's MDC.
event.getMDCCopy();
}
if (shallRecursionPrevented(this.getClass(), event.getLoggerName())
|| shallRecursionPrevented(ZMLog.class, event.getLoggerName())) return;
{ // IMPORTANT: this section is something MUST be called!
event.getRenderedMessage();
event.getThrowableStrRep();
/*
* SCENARIO:
* while tl!=started, we suppose to start a new tl.
* log4j shoulden't terminate other's tl, it can only terminate it's selves.
*
* depth=0, tl==started, controlBySelf [complete] this tl is reaching it's end, should be terminated.
* depth=0, tl==started, controlByOthers [recording] this tl is controlled by others, log4j is simply an interceptor, do recording.
*
* depth=0, tl!=started, controlBySelf [doNothing] because tl can only be started while depth>0.
* depth=0, tl!=started, controlByOthers [doNothing] because tl can only be started while depth>0.
*
* depth>0, tl==started, controlBySelf [recording] watch out the depth problem.
* depth>0, tl==started, controlByOthers [recording] watch out the depth problem.
*
* depth>0, tl!=started, controlBySelf [do Start]
* depth>0, tl!=started, controlByOthers [do Start]
*
*/
TimelineLifecycle lfc = ZMonitorManager.getInstance().getTimelineLifecycle();
String mesg = event.getRenderedMessage();
if (depth == 0) {
if (ZMonitor.isTimelineStarted()) {
if (isControlledBySelf(lfc)) {
complete(event, mesg, lfc);
} else {
record(event, depth, lfc, ndcStr);
}
}
// do nothing...
// tl.start must satisfy (depth > 0), otherwise there's no way for appender to know when to
// complete timeline.
} else {
if (ZMonitor.isTimelineStarted()) {
record(event, depth, lfc, ndcStr);
} else {
start(event, depth, lfc, ndcStr);
setControlledBySelf(lfc);
}
}
}
}