public void dispatch(ServletContext context, String path) {
boolean dispatch = false;
AsyncContextEvent event;
try (Locker.Lock lock = _locker.lock()) {
if (DEBUG) LOG.debug("dispatch {} -> {}", toStringLocked(), path);
boolean started = false;
event = _event;
switch (_async) {
case STARTED:
started = true;
break;
case EXPIRING:
case ERRORING:
case ERRORED:
break;
default:
throw new IllegalStateException(this.getStatusStringLocked());
}
_async = Async.DISPATCH;
if (context != null) _event.setDispatchContext(context);
if (path != null) _event.setDispatchPath(path);
if (started) {
switch (_state) {
case DISPATCHED:
case ASYNC_IO:
case ASYNC_WOKEN:
break;
case ASYNC_WAIT:
_state = State.ASYNC_WOKEN;
dispatch = true;
break;
default:
LOG.warn("async dispatched when complete {}", this);
break;
}
}
}
cancelTimeout(event);
if (dispatch) scheduleDispatch();
}
protected void onError(Throwable failure) {
final List<AsyncListener> listeners;
final AsyncContextEvent event;
final Request baseRequest = _channel.getRequest();
int code = HttpStatus.INTERNAL_SERVER_ERROR_500;
String reason = null;
if (failure instanceof BadMessageException) {
BadMessageException bme = (BadMessageException) failure;
code = bme.getCode();
reason = bme.getReason();
} else if (failure instanceof UnavailableException) {
if (((UnavailableException) failure).isPermanent()) code = HttpStatus.NOT_FOUND_404;
else code = HttpStatus.SERVICE_UNAVAILABLE_503;
}
try (Locker.Lock lock = _locker.lock()) {
if (DEBUG) LOG.debug("onError {} {}", toStringLocked(), failure);
// Set error on request.
if (_event != null) {
if (_event.getThrowable() != null)
throw new IllegalStateException("Error already set", _event.getThrowable());
_event.addThrowable(failure);
_event.getSuppliedRequest().setAttribute(ERROR_STATUS_CODE, code);
_event.getSuppliedRequest().setAttribute(ERROR_EXCEPTION, failure);
_event
.getSuppliedRequest()
.setAttribute(
RequestDispatcher.ERROR_EXCEPTION_TYPE,
failure == null ? null : failure.getClass());
_event.getSuppliedRequest().setAttribute(ERROR_MESSAGE, reason != null ? reason : null);
} else {
Throwable error = (Throwable) baseRequest.getAttribute(ERROR_EXCEPTION);
if (error != null) throw new IllegalStateException("Error already set", error);
baseRequest.setAttribute(ERROR_STATUS_CODE, code);
baseRequest.setAttribute(ERROR_EXCEPTION, failure);
baseRequest.setAttribute(
RequestDispatcher.ERROR_EXCEPTION_TYPE, failure == null ? null : failure.getClass());
baseRequest.setAttribute(ERROR_MESSAGE, reason != null ? reason : null);
}
// Are we blocking?
if (_async == null) {
// Only called from within HttpChannel Handling, so much be dispatched, let's stay
// dispatched!
if (_state == State.DISPATCHED) {
_state = State.THROWN;
return;
}
throw new IllegalStateException(this.getStatusStringLocked());
}
// We are Async
_async = Async.ERRORING;
listeners = _asyncListeners;
event = _event;
}
if (listeners != null) {
Runnable task =
new Runnable() {
@Override
public void run() {
for (AsyncListener listener : listeners) {
try {
listener.onError(event);
} catch (Throwable x) {
LOG.warn(x + " while invoking onError listener " + listener);
LOG.debug(x);
}
}
}
@Override
public String toString() {
return "onError";
}
};
runInContext(event, task);
}
boolean dispatch = false;
try (Locker.Lock lock = _locker.lock()) {
switch (_async) {
case ERRORING:
{
// Still in this state ? The listeners did not invoke API methods
// and the container must provide a default error dispatch.
_async = Async.ERRORED;
break;
}
case DISPATCH:
case COMPLETE:
{
// The listeners called dispatch() or complete().
break;
}
default:
{
throw new IllegalStateException(toString());
}
}
if (_state == State.ASYNC_WAIT) {
_state = State.ASYNC_WOKEN;
dispatch = true;
}
}
if (dispatch) {
if (LOG.isDebugEnabled()) LOG.debug("Dispatch after error {}", this);
scheduleDispatch();
}
}
protected void onTimeout() {
final List<AsyncListener> listeners;
AsyncContextEvent event;
try (Locker.Lock lock = _locker.lock()) {
if (DEBUG) LOG.debug("onTimeout {}", toStringLocked());
if (_async != Async.STARTED) return;
_async = Async.EXPIRING;
event = _event;
listeners = _asyncListeners;
}
final AtomicReference<Throwable> error = new AtomicReference<Throwable>();
if (listeners != null) {
Runnable task =
new Runnable() {
@Override
public void run() {
for (AsyncListener listener : listeners) {
try {
listener.onTimeout(event);
} catch (Throwable x) {
LOG.warn(x + " while invoking onTimeout listener " + listener);
LOG.debug(x);
if (error.get() == null) error.set(x);
else error.get().addSuppressed(x);
}
}
}
@Override
public String toString() {
return "onTimeout";
}
};
runInContext(event, task);
}
Throwable th = error.get();
boolean dispatch = false;
try (Locker.Lock lock = _locker.lock()) {
switch (_async) {
case EXPIRING:
_async = th == null ? Async.EXPIRED : Async.ERRORING;
break;
case COMPLETE:
case DISPATCH:
if (th != null) {
LOG.ignore(th);
th = null;
}
break;
default:
throw new IllegalStateException();
}
if (_state == State.ASYNC_WAIT) {
_state = State.ASYNC_WOKEN;
dispatch = true;
}
}
if (th != null) {
if (LOG.isDebugEnabled()) LOG.debug("Error after async timeout {}", this, th);
onError(th);
}
if (dispatch) {
if (LOG.isDebugEnabled()) LOG.debug("Dispatch after async timeout {}", this);
scheduleDispatch();
}
}