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);
}
