public async Task <string> StartWorkflow <TData>(string workflowId, int version, TData data)
{
if (_shutdown)
{
throw new Exception("Host is not running");
}
var def = _registry.GetDefinition(workflowId, version);
if (def == null)
{
throw new Exception(String.Format("Workflow {0} version {1} is not registered", workflowId, version));
}
var wf = new WorkflowInstance();
wf.WorkflowDefinitionId = workflowId;
wf.Version = version;
wf.Data = data;
wf.Description = def.Description;
wf.NextExecution = 0;
wf.Status = WorkflowStatus.Runnable;
wf.ExecutionPointers.Add(new ExecutionPointer()
{
StepId = def.InitialStep, Active = true
});
string id = await _persistenceStore.CreateNewWorkflow(wf);
await _queueProvider.QueueForProcessing(id);
return(id);
}
public async Task <string> StartWorkflow <TData>(string workflowId, int?version, TData data = null)
where TData : class
{
var def = _registry.GetDefinition(workflowId, version);
if (def == null)
{
throw new WorkflowNotRegisteredException(workflowId, version);
}
var wf = new WorkflowInstance
{
WorkflowDefinitionId = workflowId,
Version = def.Version,
Data = data,
Description = def.Description,
NextExecution = 0,
CreateTime = DateTime.Now.ToUniversalTime(),
Status = WorkflowStatus.Runnable
};
if ((def.DataType != null) && (data == null))
{
wf.Data = TypeExtensions.GetConstructor(def.DataType, new Type[] { }).Invoke(null);
}
wf.ExecutionPointers.Add(_pointerFactory.BuildGenesisPointer(def));
string id = await _persistenceStore.CreateNewWorkflow(wf);
await _queueProvider.QueueWork(id, QueueType.Workflow);
return(id);
}
public async Task <string> StartWorkflow <TData>(string workflowId, int?version, TData data = null, string reference = null)
where TData : class, new()
{
var def = _registry.GetDefinition(workflowId, version);
if (def == null)
{
throw new WorkflowNotRegisteredException(workflowId, version);
}
var wf = new WorkflowInstance
{
WorkflowDefinitionId = workflowId,
Version = def.Version,
Data = data,
Description = def.Description,
NextExecution = 0,
CreateTime = _dateTimeProvider.UtcNow,
Status = WorkflowStatus.Runnable,
Reference = reference
};
if ((def.DataType != null) && (data == null))
{
if (typeof(TData) == def.DataType)
{
wf.Data = new TData();
}
else
{
wf.Data = def.DataType.GetConstructor(new Type[0]).Invoke(new object[0]);
}
}
wf.ExecutionPointers.Add(_pointerFactory.BuildGenesisPointer(def));
using (var scope = _serviceProvider.CreateScope())
{
var middlewareRunner = scope.ServiceProvider.GetRequiredService <IWorkflowMiddlewareRunner>();
await middlewareRunner.RunPreMiddleware(wf, def);
}
string id = await _persistenceStore.CreateNewWorkflow(wf);
await _queueProvider.QueueWork(id, QueueType.Workflow);
await _queueProvider.QueueWork(id, QueueType.Index);
await _eventHub.PublishNotification(new WorkflowStarted
{
EventTimeUtc = _dateTimeProvider.UtcNow,
Reference = reference,
WorkflowInstanceId = id,
WorkflowDefinitionId = def.Id,
Version = def.Version
});
return(id);
}
public async Task <IActionResult> Post(string workflowName, int?version, string document)
{
var def = _registry.GetDefinition(workflowName, version);
if (def == null)
{
return(BadRequest($"Workflow definition {workflowName} for version {version} not found"));
}
var workflowId = await _workflowService.StartWorkflow(
workflowName,
version,
data : new UntypedDocumentWorkflowData {
Document = document
});
return(Ok(workflowId));
}
public async Task <string> StartWorkflow <TData>(string workflowId, int?version, TData data = null, string reference = null)
where TData : class, new()
{
var def = _registry.GetDefinition(workflowId, version);
if (def == null)
{
throw new WorkflowNotRegisteredException(workflowId, version);
}
var wf = new WorkflowInstance
{
WorkflowDefinitionId = workflowId,
Version = def.Version,
Data = data,
Description = def.Description,
NextExecution = 0,
CreateTime = DateTime.Now.ToUniversalTime(),
Status = WorkflowStatus.Runnable,
Reference = reference
};
if ((def.DataType != null) && (data == null))
{
wf.Data = new TData();
}
wf.ExecutionPointers.Add(_pointerFactory.BuildGenesisPointer(def));
string id = await _persistenceStore.CreateNewWorkflow(wf);
await _queueProvider.QueueWork(id, QueueType.Workflow);
await _eventHub.PublishNotification(new WorkflowStarted()
{
EventTimeUtc = DateTime.UtcNow,
Reference = reference,
WorkflowInstanceId = id,
WorkflowDefinitionId = def.Id,
Version = def.Version
});
return(id);
}
public async Task <string> StartWorkflow <TData>(string workflowId, int?version, TData data = null)
where TData : class
{
var def = _registry.GetDefinition(workflowId, version);
if (def == null)
{
throw new WorkflowNotRegisteredException(workflowId, version);
}
var wf = new WorkflowInstance
{
WorkflowDefinitionId = workflowId,
Version = def.Version,
Data = data,
Description = def.Description,
NextExecution = 0,
CreateTime = DateTime.Now.ToUniversalTime(),
Status = WorkflowStatus.Runnable
};
if ((def.DataType != null) && (data == null))
{
wf.Data = TypeExtensions.GetConstructor(def.DataType, new Type[] { }).Invoke(null);
}
wf.ExecutionPointers.Add(new ExecutionPointer
{
Id = Guid.NewGuid().ToString(),
StepId = 0,
Active = true,
StepName = Enumerable.First <WorkflowStep>(def.Steps, x => x.Id == 0).Name
});
string id = await _persistenceStore.CreateNewWorkflow(wf);
await _queueProvider.QueueWork(id, QueueType.Workflow);
return(id);
}
public async Task <IActionResult> Post(string id, int?version, [FromBody] JObject data)
{
string workflowId = null;
var def = _registry.GetDefinition(id, version);
if (def == null)
{
return(BadRequest(String.Format("Workflow defintion {0} for version {1} not found", id, version)));
}
if ((data != null) && (def.DataType != null))
{
var dataStr = JsonConvert.SerializeObject(data);
var dataObj = JsonConvert.DeserializeObject(dataStr, def.DataType);
workflowId = await _workflowHost.StartWorkflow(id, version, dataObj);
}
else
{
workflowId = await _workflowHost.StartWorkflow(id, version, null);
}
return(Ok(workflowId));
}
public async Task <WorkflowInstance> RunWorkflowSync <TData>(string workflowId, int version, TData data, string reference, CancellationToken token, bool persistSate = true)
where TData : new()
{
var def = _registry.GetDefinition(workflowId, version);
if (def == null)
{
throw new WorkflowNotRegisteredException(workflowId, version);
}
var wf = new WorkflowInstance
{
WorkflowDefinitionId = workflowId,
Version = def.Version,
Data = data,
Description = def.Description,
NextExecution = 0,
CreateTime = _dateTimeProvider.UtcNow,
Status = WorkflowStatus.Suspended,
Reference = reference
};
if ((def.DataType != null) && (data == null))
{
if (typeof(TData) == def.DataType)
{
wf.Data = new TData();
}
else
{
wf.Data = def.DataType.GetConstructor(new Type[0]).Invoke(new object[0]);
}
}
wf.ExecutionPointers.Add(_pointerFactory.BuildGenesisPointer(def));
var id = Guid.NewGuid().ToString();
if (persistSate)
{
id = await _persistenceStore.CreateNewWorkflow(wf, token);
}
else
{
wf.Id = id;
}
wf.Status = WorkflowStatus.Runnable;
if (!await _lockService.AcquireLock(id, CancellationToken.None))
{
throw new InvalidOperationException();
}
try
{
while ((wf.Status == WorkflowStatus.Runnable) && !token.IsCancellationRequested)
{
await _executor.Execute(wf, token);
if (persistSate)
{
await _persistenceStore.PersistWorkflow(wf, token);
}
}
}
finally
{
await _lockService.ReleaseLock(id);
}
if (persistSate)
{
await _queueService.QueueWork(id, QueueType.Index);
}
return(wf);
}
public async Task <WorkflowExecutorResult> Execute(WorkflowInstance workflow, WorkflowOptions options)
{
var wfResult = new WorkflowExecutorResult();
var exePointers = new List <ExecutionPointer>(workflow.ExecutionPointers.Where(x => x.Active && (!x.SleepUntil.HasValue || x.SleepUntil < _datetimeProvider.Now.ToUniversalTime())));
var def = _registry.GetDefinition(workflow.WorkflowDefinitionId, workflow.Version);
if (def == null)
{
_logger.LogError("Workflow {0} version {1} is not registered", workflow.WorkflowDefinitionId, workflow.Version);
return(wfResult);
}
foreach (var pointer in exePointers)
{
var step = def.Steps.First(x => x.Id == pointer.StepId);
if (step != null)
{
try
{
switch (step.InitForExecution(wfResult, def, workflow, pointer))
{
case ExecutionPipelineDirective.Defer:
continue;
case ExecutionPipelineDirective.EndWorkflow:
workflow.Status = WorkflowStatus.Complete;
workflow.CompleteTime = _datetimeProvider.Now.ToUniversalTime();
continue;
}
if (!pointer.StartTime.HasValue)
{
pointer.StartTime = _datetimeProvider.Now.ToUniversalTime();
}
_logger.LogDebug("Starting step {0} on workflow {1}", step.Name, workflow.Id);
IStepBody body = step.ConstructBody(_serviceProvider);
if (body == null)
{
_logger.LogError("Unable to construct step body {0}", step.BodyType.ToString());
pointer.SleepUntil = _datetimeProvider.Now.ToUniversalTime().Add(options.ErrorRetryInterval);
wfResult.Errors.Add(new ExecutionError()
{
WorkflowId = workflow.Id,
ExecutionPointerId = pointer.Id,
ErrorTime = _datetimeProvider.Now.ToUniversalTime(),
Message = String.Format("Unable to construct step body {0}", step.BodyType.ToString())
});
continue;
}
IStepExecutionContext context = new StepExecutionContext()
{
Workflow = workflow,
Step = step,
PersistenceData = pointer.PersistenceData,
ExecutionPointer = pointer,
Item = pointer.ContextItem
};
ProcessInputs(workflow, step, body, context);
switch (step.BeforeExecute(wfResult, context, pointer, body))
{
case ExecutionPipelineDirective.Defer:
continue;
case ExecutionPipelineDirective.EndWorkflow:
workflow.Status = WorkflowStatus.Complete;
workflow.CompleteTime = _datetimeProvider.Now.ToUniversalTime();
continue;
}
var result = await body.RunAsync(context);
if (result.Proceed)
{
ProcessOutputs(workflow, step, body);
}
ProcessExecutionResult(workflow, def, pointer, step, result, wfResult);
step.AfterExecute(wfResult, context, result, pointer);
}
catch (Exception ex)
{
pointer.RetryCount++;
_logger.LogError("Workflow {0} raised error on step {1} Message: {2}", workflow.Id, pointer.StepId, ex.Message);
wfResult.Errors.Add(new ExecutionError()
{
WorkflowId = workflow.Id,
ExecutionPointerId = pointer.Id,
ErrorTime = _datetimeProvider.Now.ToUniversalTime(),
Message = ex.Message
});
switch (step.ErrorBehavior ?? def.DefaultErrorBehavior)
{
case WorkflowErrorHandling.Retry:
pointer.SleepUntil = _datetimeProvider.Now.ToUniversalTime().Add(step.RetryInterval ?? def.DefaultErrorRetryInterval ?? options.ErrorRetryInterval);
break;
case WorkflowErrorHandling.Suspend:
workflow.Status = WorkflowStatus.Suspended;
break;
case WorkflowErrorHandling.Terminate:
workflow.Status = WorkflowStatus.Terminated;
break;
}
Host.ReportStepError(workflow, step, ex);
}
}
else
{
_logger.LogError("Unable to find step {0} in workflow definition", pointer.StepId);
pointer.SleepUntil = _datetimeProvider.Now.ToUniversalTime().Add(options.ErrorRetryInterval);
wfResult.Errors.Add(new ExecutionError()
{
WorkflowId = workflow.Id,
ExecutionPointerId = pointer.Id,
ErrorTime = _datetimeProvider.Now.ToUniversalTime(),
Message = String.Format("Unable to find step {0} in workflow definition", pointer.StepId)
});
}
}
ProcessAfterExecutionIteration(workflow, def, wfResult);
DetermineNextExecutionTime(workflow);
return(wfResult);
}
public async Task <WorkflowExecutorResult> Execute(WorkflowInstance workflow)
{
var wfResult = new WorkflowExecutorResult();
var exePointers = new List <ExecutionPointer>(workflow.ExecutionPointers.Where(x => x.Active && (!x.SleepUntil.HasValue || x.SleepUntil < _datetimeProvider.Now.ToUniversalTime())));
var def = _registry.GetDefinition(workflow.WorkflowDefinitionId, workflow.Version);
if (def == null)
{
_logger.LogError("Workflow {0} version {1} is not registered", workflow.WorkflowDefinitionId, workflow.Version);
return(wfResult);
}
_cancellationProcessor.ProcessCancellations(workflow, def, wfResult);
foreach (var pointer in exePointers)
{
if (!pointer.Active)
{
continue;
}
var step = def.Steps.FindById(pointer.StepId);
if (step == null)
{
_logger.LogError("Unable to find step {0} in workflow definition", pointer.StepId);
pointer.SleepUntil = _datetimeProvider.Now.ToUniversalTime().Add(_options.ErrorRetryInterval);
wfResult.Errors.Add(new ExecutionError()
{
WorkflowId = workflow.Id,
ExecutionPointerId = pointer.Id,
ErrorTime = _datetimeProvider.Now.ToUniversalTime(),
Message = $"Unable to find step {pointer.StepId} in workflow definition"
});
continue;
}
try
{
if (!InitializeStep(workflow, step, wfResult, def, pointer))
{
continue;
}
await ExecuteStep(workflow, step, pointer, wfResult, def);
}
catch (Exception ex)
{
_logger.LogError("Workflow {0} raised error on step {1} Message: {2}", workflow.Id, pointer.StepId, ex.Message);
wfResult.Errors.Add(new ExecutionError()
{
WorkflowId = workflow.Id,
ExecutionPointerId = pointer.Id,
ErrorTime = _datetimeProvider.Now.ToUniversalTime(),
Message = ex.Message
});
_executionResultProcessor.HandleStepException(workflow, def, pointer, step, ex);
Host.ReportStepError(workflow, step, ex);
}
_cancellationProcessor.ProcessCancellations(workflow, def, wfResult);
}
ProcessAfterExecutionIteration(workflow, def, wfResult);
DetermineNextExecutionTime(workflow);
return(wfResult);
}
public async Task <WorkflowExecutorResult> Execute(WorkflowInstance workflow)
{
var wfResult = new WorkflowExecutorResult();
var exePointers = new List <ExecutionPointer>(workflow.ExecutionPointers.Where(x => x.Active && (!x.SleepUntil.HasValue || x.SleepUntil < _datetimeProvider.Now.ToUniversalTime())));
var def = _registry.GetDefinition(workflow.WorkflowDefinitionId, workflow.Version);
if (def == null)
{
_logger.LogError("Workflow {0} version {1} is not registered", workflow.WorkflowDefinitionId, workflow.Version);
return(wfResult);
}
foreach (var pointer in exePointers)
{
if (pointer.Status == PointerStatus.Cancelled)
{
continue;
}
var step = def.Steps.FindById(pointer.StepId);
if (step == null)
{
_logger.LogError("Unable to find step {0} in workflow definition", pointer.StepId);
pointer.SleepUntil = _datetimeProvider.Now.ToUniversalTime().Add(_options.ErrorRetryInterval);
wfResult.Errors.Add(new ExecutionError()
{
WorkflowId = workflow.Id,
ExecutionPointerId = pointer.Id,
ErrorTime = _datetimeProvider.Now.ToUniversalTime(),
Message = String.Format("Unable to find step {0} in workflow definition", pointer.StepId)
});
continue;
}
try
{
switch (step.InitForExecution(wfResult, def, workflow, pointer))
{
case ExecutionPipelineDirective.Defer:
continue;
case ExecutionPipelineDirective.EndWorkflow:
workflow.Status = WorkflowStatus.Complete;
workflow.CompleteTime = _datetimeProvider.Now.ToUniversalTime();
continue;
}
if (pointer.Status != PointerStatus.Running)
{
pointer.Status = PointerStatus.Running;
_publisher.PublishNotification(new StepStarted()
{
EventTimeUtc = _datetimeProvider.Now,
Reference = workflow.Reference,
ExecutionPointerId = pointer.Id,
StepId = step.Id,
WorkflowInstanceId = workflow.Id,
WorkflowDefinitionId = workflow.WorkflowDefinitionId,
Version = workflow.Version
});
}
if (!pointer.StartTime.HasValue)
{
pointer.StartTime = _datetimeProvider.Now.ToUniversalTime();
}
using (var scope = _scopeProvider.CreateScope())
{
_logger.LogDebug("Starting step {0} on workflow {1}", step.Name, workflow.Id);
IStepBody body = step.ConstructBody(scope.ServiceProvider);
if (body == null)
{
_logger.LogError("Unable to construct step body {0}", step.BodyType.ToString());
pointer.SleepUntil = _datetimeProvider.Now.ToUniversalTime().Add(_options.ErrorRetryInterval);
wfResult.Errors.Add(new ExecutionError()
{
WorkflowId = workflow.Id,
ExecutionPointerId = pointer.Id,
ErrorTime = _datetimeProvider.Now.ToUniversalTime(),
Message = String.Format("Unable to construct step body {0}", step.BodyType.ToString())
});
continue;
}
IStepExecutionContext context = new StepExecutionContext()
{
Workflow = workflow,
Step = step,
PersistenceData = pointer.PersistenceData,
ExecutionPointer = pointer,
Item = pointer.ContextItem
};
foreach (var input in step.Inputs)
{
input.AssignInput(workflow.Data, body, context);
}
switch (step.BeforeExecute(wfResult, context, pointer, body))
{
case ExecutionPipelineDirective.Defer:
continue;
case ExecutionPipelineDirective.EndWorkflow:
workflow.Status = WorkflowStatus.Complete;
workflow.CompleteTime = _datetimeProvider.Now.ToUniversalTime();
continue;
}
var result = await body.RunAsync(context);
if (result.Proceed)
{
foreach (var output in step.Outputs)
{
output.AssignOutput(workflow.Data, body, context);
}
}
_executionResultProcessor.ProcessExecutionResult(workflow, def, pointer, step, result, wfResult);
step.AfterExecute(wfResult, context, result, pointer);
}
}
catch (Exception ex)
{
_logger.LogError("Workflow {0} raised error on step {1} Message: {2}", workflow.Id, pointer.StepId, ex.Message);
wfResult.Errors.Add(new ExecutionError()
{
WorkflowId = workflow.Id,
ExecutionPointerId = pointer.Id,
ErrorTime = _datetimeProvider.Now.ToUniversalTime(),
Message = ex.Message
});
_executionResultProcessor.HandleStepException(workflow, def, pointer, step, ex);
Host.ReportStepError(workflow, step, ex);
}
_cancellationProcessor.ProcessCancellations(workflow, def, wfResult);
}
ProcessAfterExecutionIteration(workflow, def, wfResult);
DetermineNextExecutionTime(workflow);
return(wfResult);
}
public async Task Execute(WorkflowInstance workflow, IPersistenceProvider persistenceStore, WorkflowOptions options)
{
//TODO: split this method up
List <ExecutionPointer> exePointers = new List <ExecutionPointer>(workflow.ExecutionPointers.Where(x => x.Active && (!x.SleepUntil.HasValue || x.SleepUntil < DateTime.Now.ToUniversalTime())));
var def = _registry.GetDefinition(workflow.WorkflowDefinitionId, workflow.Version);
if (def == null)
{
_logger.LogError("Workflow {0} version {1} is not registered", workflow.WorkflowDefinitionId, workflow.Version);
return;
}
foreach (var pointer in exePointers)
{
var step = def.Steps.First(x => x.Id == pointer.StepId);
if (step != null)
{
try
{
if (step.InitForExecution(_host, persistenceStore, def, workflow, pointer) == ExecutionPipelineDirective.Defer)
{
continue;
}
if (!pointer.StartTime.HasValue)
{
pointer.StartTime = DateTime.Now;
}
_logger.LogDebug("Starting step {0} on workflow {1}", step.Name, workflow.Id);
IStepBody body;
if (step is WorkflowStepInline)
{
body = new InlineStepBody((step as WorkflowStepInline).Body);
}
else
{
body = (_serviceProvider.GetService(step.BodyType) as IStepBody);
if (body == null)
{
var stepCtor = step.BodyType.GetConstructor(new Type[] { });
if (stepCtor != null)
{
body = (stepCtor.Invoke(null) as IStepBody);
}
}
if (body == null)
{
_logger.LogError("Unable to construct step body {0}", step.BodyType.ToString());
pointer.SleepUntil = DateTime.Now.ToUniversalTime().Add(options.ErrorRetryInterval);
pointer.Errors.Add(new ExecutionError()
{
Id = Guid.NewGuid().ToString(),
ErrorTime = DateTime.Now.ToUniversalTime(),
Message = String.Format("Unable to construct step body {0}", step.BodyType.ToString())
});
continue;
}
}
foreach (var input in step.Inputs)
{
var member = (input.Target.Body as MemberExpression);
var resolvedValue = input.Source.Compile().DynamicInvoke(workflow.Data);
step.BodyType.GetProperty(member.Member.Name).SetValue(body, resolvedValue);
}
IStepExecutionContext context = new StepExecutionContext()
{
Workflow = workflow,
Step = step,
PersistenceData = pointer.PersistenceData
};
if (step.BeforeExecute(_host, persistenceStore, context, pointer, body) == ExecutionPipelineDirective.Defer)
{
continue;
}
var result = body.Run(context);
foreach (var output in step.Outputs)
{
var member = (output.Target.Body as MemberExpression);
var resolvedValue = output.Source.Compile().DynamicInvoke(body);
var data = workflow.Data;
data.GetType().GetProperty(member.Member.Name).SetValue(data, resolvedValue);
}
if (result.Proceed)
{
pointer.Active = false;
pointer.EndTime = DateTime.Now;
int forkCounter = 1;
bool noOutcomes = true;
foreach (var outcome in step.Outcomes.Where(x => object.Equals(x.Value, result.OutcomeValue)))
{
workflow.ExecutionPointers.Add(new ExecutionPointer()
{
Id = Guid.NewGuid().ToString(),
StepId = outcome.NextStep,
Active = true,
ConcurrentFork = (forkCounter * pointer.ConcurrentFork),
StepName = def.Steps.First(x => x.Id == outcome.NextStep).Name
});
noOutcomes = false;
forkCounter++;
}
pointer.PathTerminator = noOutcomes;
}
else
{
pointer.PersistenceData = result.PersistenceData;
if (result.SleepFor.HasValue)
{
pointer.SleepUntil = DateTime.Now.ToUniversalTime().Add(result.SleepFor.Value);
}
}
step.AfterExecute(_host, persistenceStore, context, result, pointer);
}
catch (Exception ex)
{
_logger.LogError("Workflow {0} raised error on step {1} Message: {2}", workflow.Id, pointer.StepId, ex.Message);
pointer.Errors.Add(new ExecutionError()
{
Id = Guid.NewGuid().ToString(),
ErrorTime = DateTime.Now.ToUniversalTime(),
Message = ex.Message
});
switch (step.ErrorBehavior ?? def.DefaultErrorBehavior)
{
case WorkflowErrorHandling.Retry:
pointer.SleepUntil = DateTime.Now.ToUniversalTime().Add(step.RetryInterval ?? def.DefaultErrorRetryInterval ?? options.ErrorRetryInterval);
break;
case WorkflowErrorHandling.Suspend:
workflow.Status = WorkflowStatus.Suspended;
break;
case WorkflowErrorHandling.Terminate:
workflow.Status = WorkflowStatus.Terminated;
break;
}
_host.ReportStepError(workflow, step, ex);
}
await persistenceStore.PersistWorkflow(workflow);
}
else
{
_logger.LogError("Unable to find step {0} in workflow definition", pointer.StepId);
pointer.SleepUntil = DateTime.Now.ToUniversalTime().Add(options.ErrorRetryInterval);
pointer.Errors.Add(new ExecutionError()
{
ErrorTime = DateTime.Now.ToUniversalTime(),
Message = String.Format("Unable to find step {0} in workflow definition", pointer.StepId)
});
}
}
DetermineNextExecutionTime(workflow);
await persistenceStore.PersistWorkflow(workflow);
}
public async Task Execute(WorkflowInstance workflow, IPersistenceProvider persistenceStore, WorkflowOptions options)
{
List <ExecutionPointer> exePointers = new List <ExecutionPointer>(workflow.ExecutionPointers.Where(x => x.Active && (!x.SleepUntil.HasValue || x.SleepUntil < DateTime.Now.ToUniversalTime())));
var def = _registry.GetDefinition(workflow.WorkflowDefinitionId, workflow.Version);
if (def == null)
{
_logger.LogError("Workflow {0} version {1} is not registered", workflow.WorkflowDefinitionId, workflow.Version);
return;
}
foreach (var pointer in exePointers)
{
var step = def.Steps.First(x => x.Id == pointer.StepId);
if (step != null)
{
try
{
if ((step is ISubscriptionStep) && (!pointer.EventPublished))
{
pointer.EventKey = (step as ISubscriptionStep).EventKey;
pointer.EventName = (step as ISubscriptionStep).EventName;
pointer.Active = false;
await persistenceStore.PersistWorkflow(workflow);
await _host.SubscribeEvent(workflow.Id, pointer.StepId, pointer.EventName, pointer.EventKey);
continue;
}
if (!pointer.StartTime.HasValue)
{
pointer.StartTime = DateTime.Now;
}
_logger.LogDebug("Starting step {0} on workflow {1}", step.Name, workflow.Id);
IStepBody body;
if (step is WorkflowStepInline)
{
body = new InlineStepBody((step as WorkflowStepInline).Body);
}
else
{
body = (_serviceProvider.GetService(step.BodyType) as IStepBody);
if (body == null)
{
var stepCtor = step.BodyType.GetConstructor(new Type[] { });
if (stepCtor != null)
{
body = (stepCtor.Invoke(null) as IStepBody);
}
}
if (body == null)
{
_logger.LogError("Unable to construct step body {0}", step.BodyType.ToString());
pointer.SleepUntil = DateTime.Now.ToUniversalTime().Add(options.ErrorRetryInterval);
pointer.Errors.Add(new ExecutionError()
{
ErrorTime = DateTime.Now.ToUniversalTime(),
Message = String.Format("Unable to construct step body {0}", step.BodyType.ToString())
});
continue;
}
}
foreach (var input in step.Inputs)
{
var member = (input.Target.Body as MemberExpression);
var resolvedValue = input.Source.Compile().DynamicInvoke(workflow.Data);
step.BodyType.GetProperty(member.Member.Name).SetValue(body, resolvedValue);
}
if ((body is ISubscriptionBody) && (pointer.EventPublished))
{
(body as ISubscriptionBody).EventData = pointer.EventData;
}
IStepExecutionContext context = new StepExecutionContext()
{
Workflow = workflow,
Step = step,
PersistenceData = pointer.PersistenceData
};
var result = body.Run(context);
foreach (var output in step.Outputs)
{
var member = (output.Target.Body as MemberExpression);
var resolvedValue = output.Source.Compile().DynamicInvoke(body);
var data = workflow.Data;
data.GetType().GetProperty(member.Member.Name).SetValue(data, resolvedValue);
}
if (result.Proceed)
{
pointer.Active = false;
pointer.EndTime = DateTime.Now;
foreach (var outcome in step.Outcomes.Where(x => object.Equals(x.Value, result.OutcomeValue)))
{
workflow.ExecutionPointers.Add(new ExecutionPointer()
{
StepId = outcome.NextStep,
Active = true
});
}
}
else
{
pointer.PersistenceData = result.PersistenceData;
if (result.SleepFor.HasValue)
{
pointer.SleepUntil = DateTime.Now.ToUniversalTime().Add(result.SleepFor.Value);
}
}
}
catch (Exception ex)
{
_logger.LogError("Workflow {0} raised error on step {1} Message: {2}", workflow.Id, pointer.StepId, ex.Message);
pointer.SleepUntil = DateTime.Now.ToUniversalTime().Add(options.ErrorRetryInterval);
pointer.Errors.Add(new ExecutionError()
{
ErrorTime = DateTime.Now.ToUniversalTime(),
Message = ex.Message
});
}
await persistenceStore.PersistWorkflow(workflow);
}
else
{
_logger.LogError("Unable to find step {0} in workflow definition", pointer.StepId);
pointer.SleepUntil = DateTime.Now.ToUniversalTime().Add(options.ErrorRetryInterval);
pointer.Errors.Add(new ExecutionError()
{
ErrorTime = DateTime.Now.ToUniversalTime(),
Message = String.Format("Unable to find step {0} in workflow definition", pointer.StepId)
});
}
}
DetermineNextExecutionTime(workflow);
await persistenceStore.PersistWorkflow(workflow);
}
public virtual WorkflowDefinition GetDefinition(string workflowId, int?version = null)
{
return(_registry.GetDefinition(workflowId, version));
}
