protected internal virtual FetchAndLockResult tryFetchAndLock(FetchAndLockRequest request)
{
ProcessEngine processEngine = null;
IdentityService identityService = null;
FetchAndLockResult result = null;
try
{
processEngine = getProcessEngine(request);
identityService = processEngine.IdentityService;
identityService.Authentication = request.Authentication;
FetchExternalTasksExtendedDto fetchingDto = request.Dto;
IList <LockedExternalTaskDto> lockedTasks = executeFetchAndLock(fetchingDto, processEngine);
result = FetchAndLockResult.successful(lockedTasks);
}
catch (Exception e)
{
result = FetchAndLockResult.failed(e);
}
finally
{
if (identityService != null)
{
identityService.clearAuthentication();
}
}
return(result);
}
public virtual void addPendingRequest(FetchExternalTasksExtendedDto dto, AsyncResponse asyncResponse, ProcessEngine processEngine)
{
long?asyncResponseTimeout = dto.AsyncResponseTimeout;
if (asyncResponseTimeout != null && asyncResponseTimeout.Value > MAX_REQUEST_TIMEOUT)
{
asyncResponse.resume(new InvalidRequestException(Status.BAD_REQUEST, "The asynchronous response timeout cannot be set to a value greater than " + MAX_REQUEST_TIMEOUT + " milliseconds"));
return;
}
IdentityService identityService = processEngine.IdentityService;
Authentication authentication = identityService.CurrentAuthentication;
string processEngineName = processEngine.Name;
FetchAndLockRequest incomingRequest = (new FetchAndLockRequest()).setProcessEngineName(processEngineName).setAsyncResponse(asyncResponse).setAuthentication(authentication).setDto(dto);
LOG.log(Level.FINEST, "New request: {0}", incomingRequest);
FetchAndLockResult result = tryFetchAndLock(incomingRequest);
LOG.log(Level.FINEST, "Fetch and lock result: {0}", result);
if (result.wasSuccessful())
{
IList <LockedExternalTaskDto> lockedTasks = result.Tasks;
if (lockedTasks.Count > 0 || dto.AsyncResponseTimeout == null)
{ // response immediately if tasks available
asyncResponse.resume(lockedTasks);
LOG.log(Level.FINEST, "Resuming request with {0}", lockedTasks);
}
else
{
addRequest(incomingRequest);
LOG.log(Level.FINEST, "Deferred request");
}
}
else
{
Exception processEngineException = result.Throwable;
asyncResponse.resume(processEngineException);
LOG.log(Level.FINEST, "Resuming request with error {0}", processEngineException);
}
}
protected internal virtual void acquire()
{
LOG.log(Level.FINEST, "Acquire start");
queue.drainTo(newRequests);
if (newRequests.Count > 0)
{
if (isUniqueWorkerRequest)
{
removeDuplicates();
}
((IList <FetchAndLockRequest>)pendingRequests).AddRange(newRequests);
newRequests.Clear();
}
LOG.log(Level.FINEST, "Number of pending requests {0}", pendingRequests.Count);
long backoffTime = MAX_BACK_OFF_TIME; //timestamp
IEnumerator <FetchAndLockRequest> iterator = pendingRequests.GetEnumerator();
while (iterator.MoveNext())
{
FetchAndLockRequest pendingRequest = iterator.Current;
LOG.log(Level.FINEST, "Fetching tasks for request {0}", pendingRequest);
FetchAndLockResult result = tryFetchAndLock(pendingRequest);
LOG.log(Level.FINEST, "Fetch and lock result: {0}", result);
if (result.wasSuccessful())
{
IList <LockedExternalTaskDto> lockedTasks = result.Tasks;
if (lockedTasks.Count > 0 || isExpired(pendingRequest))
{
AsyncResponse asyncResponse = pendingRequest.AsyncResponse;
asyncResponse.resume(lockedTasks);
LOG.log(Level.FINEST, "resume and remove request with {0}", lockedTasks);
//JAVA TO C# CONVERTER TODO TASK: .NET enumerators are read-only:
iterator.remove();
}
else
{
//JAVA TO C# CONVERTER WARNING: The original Java variable was marked 'final':
//ORIGINAL LINE: final long msUntilTimeout = pendingRequest.getTimeoutTimestamp() - org.camunda.bpm.engine.impl.util.ClockUtil.getCurrentTime().getTime();
long msUntilTimeout = pendingRequest.TimeoutTimestamp - ClockUtil.CurrentTime.Ticks;
backoffTime = Math.Min(backoffTime, msUntilTimeout);
}
}
else
{
AsyncResponse asyncResponse = pendingRequest.AsyncResponse;
Exception processEngineException = result.Throwable;
asyncResponse.resume(processEngineException);
LOG.log(Level.FINEST, "Resume and remove request with error {0}", processEngineException);
//JAVA TO C# CONVERTER TODO TASK: .NET enumerators are read-only:
iterator.remove();
}
}
//JAVA TO C# CONVERTER WARNING: The original Java variable was marked 'final':
//ORIGINAL LINE: final long waitTime = Math.max(0, backoffTime);
long waitTime = Math.Max(0, backoffTime);
if (pendingRequests.Count == 0)
{
suspend(waitTime);
}
else
{
// if there are pending requests, try fetch periodically to ensure tasks created on other
// cluster nodes and tasks with expired timeouts can be fetched in a timely manner
suspend(Math.Min(PENDING_REQUEST_FETCH_INTERVAL, waitTime));
}
}