Beispiel #1
0
        public async Task <bool> ResumeWorkflow(string workflowId)
        {
            if (LockProvider.AcquireLock(workflowId).Result)
            {
                bool requeue = false;
                try
                {
                    var wf = await PersistenceStore.GetWorkflowInstance(workflowId);

                    if (wf.Status == WorkflowStatus.Suspended)
                    {
                        wf.Status = WorkflowStatus.Runnable;
                        await PersistenceStore.PersistWorkflow(wf);

                        requeue = true;
                        return(true);
                    }
                    return(false);
                }
                finally
                {
                    await LockProvider.ReleaseLock(workflowId);

                    if (requeue)
                    {
                        await QueueProvider.QueueForProcessing(workflowId);
                    }
                }
            }
            return(false);
        }
        public async Task <bool> SuspendWorkflow(string workflowId)
        {
            if (await LockProvider.AcquireLock(workflowId, new CancellationToken()))
            {
                try
                {
                    var wf = await PersistenceStore.GetWorkflowInstance(workflowId);

                    if (wf.Status == WorkflowStatus.Runnable)
                    {
                        wf.Status = WorkflowStatus.Suspended;
                        await PersistenceStore.PersistWorkflow(wf);

                        return(true);
                    }

                    return(false);
                }
                finally
                {
                    await LockProvider.ReleaseLock(workflowId);
                }
            }

            return(false);
        }
Beispiel #3
0
        /// <summary>
        /// Worker thread body
        /// </summary>
        private void RunWorkflows()
        {
            IWorkflowExecutor    workflowExecutor = _serviceProvider.GetService <IWorkflowExecutor>();
            IPersistenceProvider persistenceStore = _serviceProvider.GetService <IPersistenceProvider>();

            while (!_shutdown)
            {
                try
                {
                    var workflowId = QueueProvider.DequeueForProcessing().Result;
                    if (workflowId != null)
                    {
                        try
                        {
                            if (LockProvider.AcquireLock(workflowId).Result)
                            {
                                WorkflowInstance workflow = null;
                                try
                                {
                                    workflow = persistenceStore.GetWorkflowInstance(workflowId).Result;
                                    if (workflow.Status == WorkflowStatus.Runnable)
                                    {
                                        workflowExecutor.Execute(workflow, persistenceStore, Options);
                                    }
                                }
                                finally
                                {
                                    LockProvider.ReleaseLock(workflowId).Wait();
                                    if (workflow != null)
                                    {
                                        if ((workflow.Status == WorkflowStatus.Runnable) && workflow.NextExecution.HasValue && workflow.NextExecution.Value < DateTime.Now.ToUniversalTime().Ticks)
                                        {
                                            QueueProvider.QueueForProcessing(workflowId);
                                        }
                                    }
                                }
                            }
                            else
                            {
                                Logger.LogInformation("Workflow locked {0}", workflowId);
                            }
                        }
                        catch (Exception ex)
                        {
                            Logger.LogError(ex.Message);
                        }
                    }
                    else
                    {
                        Thread.Sleep(Options.IdleTime); //no work
                    }
                }
                catch (Exception ex)
                {
                    Logger.LogError(ex.Message);
                }
            }
        }
Beispiel #4
0
        /// <summary>
        /// Poll the persistence store for workflows ready to run.
        /// Poll the persistence store for stashed unpublished events
        /// </summary>
        private void PollRunnables(object target)
        {
            try
            {
                if (LockProvider.AcquireLock("poll runnables").Result)
                {
                    try
                    {
                        Logger.LogInformation("Polling for runnable workflows");
                        IPersistenceProvider persistenceStore = _serviceProvider.GetService <IPersistenceProvider>();
                        var runnables = persistenceStore.GetRunnableInstances().Result;
                        foreach (var item in runnables)
                        {
                            Logger.LogDebug("Got runnable instance {0}", item);
                            QueueProvider.QueueForProcessing(item);
                        }
                    }
                    finally
                    {
                        LockProvider.ReleaseLock("poll runnables").Wait();
                    }
                }
            }
            catch (Exception ex)
            {
                Logger.LogError(ex.Message);
            }

            try
            {
                if (LockProvider.AcquireLock("unpublished events").Result)
                {
                    try
                    {
                        Logger.LogInformation("Polling for unpublished events");
                        IPersistenceProvider persistenceStore = _serviceProvider.GetService <IPersistenceProvider>();
                        var events = persistenceStore.GetUnpublishedEvents().Result.ToList();
                        foreach (var item in events)
                        {
                            Logger.LogDebug("Got unpublished event {0} {1}", item.EventName, item.EventKey);
                            QueueProvider.QueueForPublishing(item).Wait();
                            persistenceStore.RemoveUnpublishedEvent(item.Id).Wait();
                        }
                    }
                    finally
                    {
                        LockProvider.ReleaseLock("unpublished events").Wait();
                    }
                }
            }
            catch (Exception ex)
            {
                Logger.LogError(ex.Message);
            }
        }
Beispiel #5
0
        public async Task <bool> TerminateWorkflow(string workflowId)
        {
            if (LockProvider.AcquireLock(workflowId).Result)
            {
                try
                {
                    var wf = await PersistenceStore.GetWorkflowInstance(workflowId);

                    wf.Status = WorkflowStatus.Terminated;
                    await PersistenceStore.PersistWorkflow(wf);

                    return(true);
                }
                finally
                {
                    await LockProvider.ReleaseLock(workflowId);
                }
            }
            return(false);
        }
Beispiel #6
0
        private void RunPublications()
        {
            IPersistenceProvider persistenceStore = _serviceProvider.GetService <IPersistenceProvider>();

            while (!_shutdown)
            {
                try
                {
                    var pub = QueueProvider.DequeueForPublishing().Result;
                    if (pub != null)
                    {
                        try
                        {
                            if (LockProvider.AcquireLock(pub.WorkflowId).Result)
                            {
                                try
                                {
                                    var workflow = persistenceStore.GetWorkflowInstance(pub.WorkflowId).Result;
                                    var pointers = workflow.ExecutionPointers.Where(p => p.EventName == pub.EventName && p.EventKey == p.EventKey && !p.EventPublished);
                                    foreach (var p in pointers)
                                    {
                                        p.EventData      = pub.EventData;
                                        p.EventPublished = true;
                                        p.Active         = true;
                                    }
                                    workflow.NextExecution = 0;
                                    persistenceStore.PersistWorkflow(workflow);
                                }
                                catch (Exception ex)
                                {
                                    Logger.LogError(ex.Message);
                                    persistenceStore.CreateUnpublishedEvent(pub); //retry later
                                }
                                finally
                                {
                                    LockProvider.ReleaseLock(pub.WorkflowId).Wait();
                                    QueueProvider.QueueForProcessing(pub.WorkflowId);
                                }
                            }
                            else
                            {
                                Logger.LogInformation("Workflow locked {0}", pub.WorkflowId);
                                persistenceStore.CreateUnpublishedEvent(pub); //retry later
                            }
                        }
                        catch (Exception ex)
                        {
                            Logger.LogError(ex.Message);
                        }
                    }
                    else
                    {
                        Thread.Sleep(Options.IdleTime); //no work
                    }
                }
                catch (Exception ex)
                {
                    Logger.LogError(ex.Message);
                }
            }
        }