private boolean addPendingRequest(final RequestContextImpl<?, ?> requestContext) {
final Integer messageID = requestContext.getMessageID();
if (isClosed.get()) {
final LocalizableMessage message = INFO_CLIENT_CONNECTION_CLOSING.get();
requestContext.handleException(
newLdapException(ResultCode.UNWILLING_TO_PERFORM, message.toString()));
return false;
} else if (pendingRequests.putIfAbsent(messageID, requestContext) != null) {
final LocalizableMessage message =
WARN_CLIENT_DUPLICATE_MESSAGE_ID.get(requestContext.getMessageID());
requestContext.handleException(
newLdapException(ResultCode.PROTOCOL_ERROR, message.toString()));
return false;
} else if (isClosed.get()) {
/*
* A concurrent close may have already removed the pending
* request but it will have only been notified for cancellation.
*/
pendingRequests.remove(messageID);
final LocalizableMessage message = INFO_CLIENT_CONNECTION_CLOSING.get();
requestContext.handleException(
newLdapException(ResultCode.UNWILLING_TO_PERFORM, message.toString()));
return false;
} else {
/*
* If the connection is closed now then we just have to pay the
* cost of invoking the request in the request handler.
*/
return true;
}
}
/** {@inheritDoc} */
@Override
public void handleAbandon(final Integer messageID, final AbandonRequest request) {
final RequestContextImpl<?, ?> abandonedRequest = getPendingRequest(request.getRequestID());
if (abandonedRequest != null) {
final LocalizableMessage abandonReason = INFO_CANCELED_BY_ABANDON_REQUEST.get(messageID);
abandonedRequest.cancel(abandonReason, null, null, false);
}
}
/** {@inheritDoc} */
@Override
public <R extends ExtendedResult> void handleExtendedRequest(
final Integer messageID,
final ExtendedRequest<R> request,
final IntermediateResponseHandler intermediateResponseHandler,
final LdapResultHandler<R> resultHandler) {
if (request.getOID().equals(CancelExtendedRequest.OID)) {
// Decode the request as a cancel request.
CancelExtendedRequest cancelRequest;
try {
cancelRequest =
CancelExtendedRequest.DECODER.decodeExtendedRequest(request, new DecodeOptions());
} catch (final DecodeException e) {
// Couldn't decode a cancel request.
resultHandler.handleException(
newLdapException(ResultCode.PROTOCOL_ERROR, e.getLocalizedMessage()));
return;
}
/*
* Register the request in the pending requests table. Even
* though this request cannot be cancelled, it is important to
* do this in order to monitor the number of pending operations.
*/
final RequestContextImpl<R, LdapResultHandler<R>> requestContext =
new RequestContextImpl<>(this, resultHandler, messageID, false);
if (addPendingRequest(requestContext)) {
// Find and cancel the request.
final RequestContextImpl<?, ?> cancelledRequest =
getPendingRequest(cancelRequest.getRequestID());
if (cancelledRequest != null) {
final LocalizableMessage cancelReason = INFO_CANCELED_BY_CANCEL_REQUEST.get(messageID);
cancelledRequest.cancel(cancelReason, request, requestContext, true);
} else {
/*
* Couldn't find the request. Invoke on context in order
* to remove pending request.
*/
requestContext.handleException(newLdapException(ResultCode.NO_SUCH_OPERATION));
}
}
} else {
// StartTLS requests cannot be cancelled.
boolean isCancelSupported = !request.getOID().equals(StartTLSExtendedRequest.OID);
final RequestContextImpl<R, LdapResultHandler<R>> requestContext =
new RequestContextImpl<>(this, resultHandler, messageID, isCancelSupported);
if (addPendingRequest(requestContext)) {
requestHandler.handleExtendedRequest(
requestContext, request, intermediateResponseHandler, requestContext);
}
}
}
private void doClose(final LocalizableMessage cancelReason) {
if (!isClosed.getAndSet(true)) {
/*
* At this point if any pending requests are added then we may
* end up cancelling them, but this does not matter since
* addPendingRequest will fail the request immediately.
*/
final Iterator<RequestContextImpl<?, ?>> iterator = pendingRequests.values().iterator();
while (iterator.hasNext()) {
final RequestContextImpl<?, ?> pendingRequest = iterator.next();
pendingRequest.cancel(cancelReason, null, null, false);
iterator.remove();
}
}
}
/**
* Deregister a request context once it has completed.
*
* @param requestContext The request context.
* @return {@code true} if the request context was found and removed.
*/
private boolean removePendingRequest(final RequestContextImpl<?, ?> requestContext) {
return pendingRequests.remove(requestContext.getMessageID()) != null;
}
