/**
* Executes a request handler and fires pre/post listener methods
*
* @param handler
*/
private void execute(IRequestHandler handler) {
Args.notNull(handler, "handler");
try {
listeners.onRequestHandlerResolved(this, handler);
requestHandlerExecutor.execute(handler);
listeners.onRequestHandlerExecuted(this, handler);
} catch (RuntimeException e) {
IRequestHandler replacement = requestHandlerExecutor.resolveHandler(e);
if (replacement != null) {
execute(replacement);
} else {
throw e;
}
}
}
/** {@inheritDoc} */
@Override
public void scheduleRequestHandlerAfterCurrent(IRequestHandler handler) {
// just delegating the call to {@link IRequestHandlerExecutor} and invoking listeners
requestHandlerExecutor.schedule(handler);
// only forward calls to the listeners when handler is null
if (handler != null) listeners.onRequestHandlerScheduled(this, handler);
}
/**
* @param handler
* @param retryCount
*/
private void executeExceptionRequestHandler(final IRequestHandler handler, final int retryCount) {
scheduleRequestHandlerAfterCurrent(null);
try {
requestHandlerExecutor.execute(handler);
} catch (Exception e) {
if (retryCount > 0) {
IRequestHandler next = handleException(e);
if (next != null) {
executeExceptionRequestHandler(next, retryCount - 1);
return;
}
}
log.error("Error during processing error message", e);
}
}
/** Called after request processing is complete, usually takes care of detaching state */
public void onDetach() {
try {
onEndRequest();
listeners.onEndRequest(this);
} catch (RuntimeException e) {
log.error("Exception occurred during onEndRequest", e);
}
try {
requestHandlerExecutor.detach();
} finally {
listeners.onDetach(this);
}
if (Session.exists()) {
Session.get().detach();
}
}
/**
* @see RequestHandlerStack#replaceAll(IRequestHandler)
* @param handler
*/
public void replaceAllRequestHandlers(final IRequestHandler handler) {
requestHandlerExecutor.replaceAll(handler);
}
/**
* @see RequestHandlerStack#next()
* @return the handler scheduled to be executed after current by the executor
*/
public IRequestHandler getRequestHandlerScheduledAfterCurrent() {
return requestHandlerExecutor.next();
}
/**
* @see RequestHandlerStack#getActive()
* @return active handler on executor
*/
public IRequestHandler getActiveRequestHandler() {
return requestHandlerExecutor.getActive();
}
