public ContextHandler getContextHandler() {
final AsyncContextEvent event;
try (Locker.Lock lock = _locker.lock()) {
event = _event;
}
return getContextHandler(event);
}
public ServletResponse getServletResponse() {
final AsyncContextEvent event;
try (Locker.Lock lock = _locker.lock()) {
event = _event;
}
return getServletResponse(event);
}
public void complete() {
// just like resume, except don't set _dispatched=true;
boolean handle = false;
AsyncContextEvent event;
try (Locker.Lock lock = _locker.lock()) {
if (DEBUG) LOG.debug("complete {}", toStringLocked());
boolean started = false;
event = _event;
switch (_async) {
case STARTED:
started = true;
break;
case EXPIRING:
case ERRORING:
case ERRORED:
break;
case COMPLETE:
return;
default:
throw new IllegalStateException(this.getStatusStringLocked());
}
_async = Async.COMPLETE;
if (started && _state == State.ASYNC_WAIT) {
handle = true;
_state = State.ASYNC_WOKEN;
}
}
cancelTimeout(event);
if (handle) runInContext(event, _channel);
}
protected void cancelTimeout() {
final AsyncContextEvent event;
try (Locker.Lock lock = _locker.lock()) {
event = _event;
}
cancelTimeout(event);
}
public void errorComplete() {
try (Locker.Lock lock = _locker.lock()) {
if (DEBUG) LOG.debug("error complete {}", toStringLocked());
_async = Async.COMPLETE;
_event.setDispatchContext(null);
_event.setDispatchPath(null);
}
cancelTimeout();
}
/**
* Called to signal that content is now available to read. If the channel is in ASYNC_WAIT state
* and unready (ie isReady() has returned false), then the state is changed to ASYNC_WOKEN and
* true is returned.
*
* @return True IFF the channel was unready and in ASYNC_WAIT state
*/
public boolean onReadPossible() {
boolean woken = false;
try (Locker.Lock lock = _locker.lock()) {
if (DEBUG) LOG.debug("onReadPossible {}", toStringLocked());
_asyncReadPossible = true;
if (_state == State.ASYNC_WAIT && _asyncReadUnready) {
woken = true;
_state = State.ASYNC_WOKEN;
}
}
return woken;
}
public boolean onWritePossible() {
boolean handle = false;
try (Locker.Lock lock = _locker.lock()) {
if (DEBUG) LOG.debug("onWritePossible {}", toStringLocked());
_asyncWrite = true;
if (_state == State.ASYNC_WAIT) {
_state = State.ASYNC_WOKEN;
handle = true;
}
}
return handle;
}
/**
* Called to signal async read isReady() has returned false. This indicates that there is no
* content available to be consumed and that once the channel enteres the ASYNC_WAIT state it will
* register for read interest by calling {@link HttpChannel#asyncReadFillInterested()} either from
* this method or from a subsequent call to {@link #unhandle()}.
*/
public void onReadUnready() {
boolean interested = false;
try (Locker.Lock lock = _locker.lock()) {
if (DEBUG) LOG.debug("onReadUnready {}", toStringLocked());
// We were already unready, this is not a state change, so do nothing
if (!_asyncReadUnready) {
_asyncReadUnready = true;
_asyncReadPossible = false; // Assumes this has been checked in isReady() with lock held
if (_state == State.ASYNC_WAIT) interested = true;
}
}
if (interested) _channel.asyncReadFillInterested();
}
protected void onComplete() {
final List<AsyncListener> aListeners;
final AsyncContextEvent event;
try (Locker.Lock lock = _locker.lock()) {
if (DEBUG) LOG.debug("onComplete {}", toStringLocked());
switch (_state) {
case COMPLETING:
aListeners = _asyncListeners;
event = _event;
_state = State.COMPLETED;
_async = null;
break;
default:
throw new IllegalStateException(this.getStatusStringLocked());
}
}
if (event != null) {
if (aListeners != null) {
Runnable callback =
new Runnable() {
@Override
public void run() {
for (AsyncListener listener : aListeners) {
try {
listener.onComplete(event);
} catch (Exception e) {
LOG.warn(e + " while invoking onComplete listener " + listener);
LOG.debug(e);
}
}
}
@Override
public String toString() {
return "onComplete";
}
};
runInContext(event, callback);
}
event.completed();
}
}
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();
}
public void upgrade() {
cancelTimeout();
try (Locker.Lock lock = _locker.lock()) {
if (DEBUG) LOG.debug("upgrade {}", toStringLocked());
switch (_state) {
case IDLE:
case COMPLETED:
break;
default:
throw new IllegalStateException(getStatusStringLocked());
}
_asyncListeners = null;
_state = State.UPGRADED;
_async = null;
_initial = true;
_asyncReadPossible = _asyncReadUnready = false;
_asyncWrite = false;
_timeoutMs = DEFAULT_TIMEOUT;
_event = null;
}
}
public void startAsync(AsyncContextEvent event) {
final List<AsyncListener> lastAsyncListeners;
try (Locker.Lock lock = _locker.lock()) {
if (DEBUG) LOG.debug("startAsync {}", toStringLocked());
if (_state != State.DISPATCHED || _async != null)
throw new IllegalStateException(this.getStatusStringLocked());
_async = Async.STARTED;
_event = event;
lastAsyncListeners = _asyncListeners;
_asyncListeners = null;
}
if (lastAsyncListeners != null) {
Runnable callback =
new Runnable() {
@Override
public void run() {
for (AsyncListener listener : lastAsyncListeners) {
try {
listener.onStartAsync(event);
} catch (Exception e) {
// TODO Async Dispatch Error
LOG.warn(e);
}
}
}
@Override
public String toString() {
return "startAsync";
}
};
runInContext(event, callback);
}
}
protected void recycle() {
cancelTimeout();
try (Locker.Lock lock = _locker.lock()) {
if (DEBUG) LOG.debug("recycle {}", toStringLocked());
switch (_state) {
case DISPATCHED:
case ASYNC_IO:
throw new IllegalStateException(getStatusStringLocked());
case UPGRADED:
return;
default:
break;
}
_asyncListeners = null;
_state = State.IDLE;
_async = null;
_initial = true;
_asyncReadPossible = _asyncReadUnready = false;
_asyncWrite = false;
_timeoutMs = DEFAULT_TIMEOUT;
_event = null;
}
}
boolean isCompleted() {
try (Locker.Lock lock = _locker.lock()) {
return _state == State.COMPLETED;
}
}
boolean isCompleting() {
try (Locker.Lock lock = _locker.lock()) {
return _state == State.COMPLETING;
}
}
public boolean isSuspended() {
try (Locker.Lock lock = _locker.lock()) {
return _state == State.ASYNC_WAIT || _state == State.DISPATCHED && _async == Async.STARTED;
}
}
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();
}
}
public boolean isReadPossible() {
try (Locker.Lock lock = _locker.lock()) {
return _asyncReadPossible;
}
}
/** @return Next handling of the request should proceed */
protected Action handling() {
try (Locker.Lock lock = _locker.lock()) {
if (DEBUG) LOG.debug("handling {}", toStringLocked());
switch (_state) {
case IDLE:
_initial = true;
_state = State.DISPATCHED;
return Action.DISPATCH;
case COMPLETING:
return Action.COMPLETE;
case COMPLETED:
return Action.TERMINATED;
case ASYNC_WOKEN:
if (_asyncReadPossible) {
_state = State.ASYNC_IO;
_asyncReadUnready = false;
return Action.READ_CALLBACK;
}
if (_asyncWrite) {
_state = State.ASYNC_IO;
_asyncWrite = false;
return Action.WRITE_CALLBACK;
}
if (_async != null) {
Async async = _async;
switch (async) {
case COMPLETE:
_state = State.COMPLETING;
return Action.COMPLETE;
case DISPATCH:
_state = State.DISPATCHED;
_async = null;
return Action.ASYNC_DISPATCH;
case EXPIRED:
case ERRORED:
_state = State.DISPATCHED;
_async = null;
return Action.ERROR_DISPATCH;
case STARTED:
case EXPIRING:
case ERRORING:
return Action.WAIT;
default:
throw new IllegalStateException(getStatusStringLocked());
}
}
return Action.WAIT;
case ASYNC_IO:
case ASYNC_WAIT:
case DISPATCHED:
case UPGRADED:
default:
throw new IllegalStateException(getStatusStringLocked());
}
}
}
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();
}
}
/**
* Signal that the HttpConnection has finished handling the request. For blocking connectors,this
* call may block if the request has been suspended (startAsync called).
*
* @return next actions be handled again (eg because of a resume that happened before unhandle was
* called)
*/
protected Action unhandle() {
Action action;
AsyncContextEvent schedule_event = null;
boolean read_interested = false;
try (Locker.Lock lock = _locker.lock()) {
if (DEBUG) LOG.debug("unhandle {}", toStringLocked());
switch (_state) {
case COMPLETING:
case COMPLETED:
return Action.TERMINATED;
case THROWN:
_state = State.DISPATCHED;
return Action.ERROR_DISPATCH;
case DISPATCHED:
case ASYNC_IO:
break;
default:
throw new IllegalStateException(this.getStatusStringLocked());
}
if (_async != null) {
_initial = false;
switch (_async) {
case COMPLETE:
_state = State.COMPLETING;
_async = null;
action = Action.COMPLETE;
break;
case DISPATCH:
_state = State.DISPATCHED;
_async = null;
action = Action.ASYNC_DISPATCH;
break;
case STARTED:
if (_asyncReadUnready && _asyncReadPossible) {
_state = State.ASYNC_IO;
_asyncReadUnready = false;
action = Action.READ_CALLBACK;
} else if (_asyncWrite) // TODO refactor same as read
{
_asyncWrite = false;
_state = State.ASYNC_IO;
action = Action.WRITE_CALLBACK;
} else {
schedule_event = _event;
read_interested = _asyncReadUnready;
_state = State.ASYNC_WAIT;
action = Action.WAIT;
}
break;
case EXPIRING:
// onTimeout callbacks still being called, so just WAIT
_state = State.ASYNC_WAIT;
action = Action.WAIT;
break;
case EXPIRED:
// onTimeout handling is complete, but did not dispatch as
// we were handling. So do the error dispatch here
_state = State.DISPATCHED;
_async = null;
action = Action.ERROR_DISPATCH;
break;
case ERRORED:
_state = State.DISPATCHED;
_async = null;
action = Action.ERROR_DISPATCH;
break;
default:
throw new IllegalStateException(this.getStatusStringLocked());
}
} else {
_state = State.COMPLETING;
action = Action.COMPLETE;
}
}
if (schedule_event != null) scheduleTimeout(schedule_event);
if (read_interested) _channel.asyncReadFillInterested();
return action;
}
public boolean isAsyncStarted() {
try (Locker.Lock lock = _locker.lock()) {
if (_state == State.DISPATCHED) return _async != null;
return _async == Async.STARTED || _async == Async.EXPIRING;
}
}
public boolean isAsync() {
try (Locker.Lock lock = _locker.lock()) {
return !_initial || _async != null;
}
}
public AsyncContextEvent getAsyncContextEvent() {
try (Locker.Lock lock = _locker.lock()) {
return _event;
}
}
public String getStatusString() {
try (Locker.Lock lock = _locker.lock()) {
return getStatusStringLocked();
}
}
public boolean isIdle() {
try (Locker.Lock lock = _locker.lock()) {
return _state == State.IDLE;
}
}
@Override
public String toString() {
try (Locker.Lock lock = _locker.lock()) {
return toStringLocked();
}
}
public boolean isExpired() {
try (Locker.Lock lock = _locker.lock()) {
return _async == Async.EXPIRED;
}
}
public long getTimeout() {
try (Locker.Lock lock = _locker.lock()) {
return _timeoutMs;
}
}
public boolean isInitial() {
try (Locker.Lock lock = _locker.lock()) {
return _initial;
}
}