/// <summary>
/// Process Step exception
/// 1. Log Execption
/// 2. Execute Compensation
/// 3. If you have a exception on compensation. log it too
/// </summary>
/// <param name="request"></param>
/// <param name="stepException"></param>
private void manageException(ChainRequest request, Exception stepException)
{
string TraceMessge = string.Format("[{2}] Step Error {0} at process instance {1}: {3}", GetType().FullName, request.ProcessInstanceId, request.ProcessTypeId, stepException.Message);
Trace.TraceError(TraceMessge);
//request.Exceptions.Add(new Exception(TraceMessge, stepException));
request.Exceptions.Add(TraceMessge);
//Exception Raise from Step
request.BreakChain = true;
try
{
//Compensatory action....
this.HandleCompensation(request);
}
catch (Exception compensationException)
{
TraceMessge = string.Format("[{2}] Step Error at compensatory method {0} at process instance {1}: {3}", GetType().FullName, request.ProcessInstanceId, request.ProcessTypeId, compensationException.Message);
Trace.TraceError(TraceMessge);
//request.Exceptions.Add(new Exception(TraceMessge, compensationException));
request.Exceptions.Add(TraceMessge);
throw (compensationException);
}
}
/// <summary>
/// Update the status in Track table.
/// </summary>
/// <param name="request"></param>
protected void UpdateProcessStatus(ChainRequest request, string txtInformation)
{
Trace.TraceInformation(txtInformation);
IButlerStorageManager storageManager = BlobManagerFactory.CreateBlobManager(request.ProcessConfigConn);
storageManager.PersistProcessStatus(request);
}
/// <summary>
/// Start the process.
/// </summary>
/// <param name="request">Request sahre by all the steps</param>
public void HandleRequest(ChainRequest request)
{
Exception stepException = null;
string TraceMessge = "";
try
{
//Execute step logic
request.CurrentStepIndex += 1;
//Update process status
TraceMessge = string.Format("[{2}] Start Step {0} at process instance {1} step # {3}", this.GetType().FullName, request.ProcessInstanceId, request.ProcessTypeId, request.CurrentStepIndex.ToString());
UpdateProcessStatus(request, TraceMessge);
//Execute Workflow's Step
HandleExecute(request);
//Update Process Status
TraceMessge = string.Format("[{2}] Finish Step {0} at process instance {1}", this.GetType().FullName, request.ProcessInstanceId, request.ProcessTypeId);
Trace.TraceInformation(TraceMessge);
}
catch (Exception currentStepException)
{
stepException = currentStepException;
//Manage Exception and Trigger Compensation
manageException(request, currentStepException);
}
//Update table status after finish Step
UpdateProcessStatus(request, "");
if (!request.BreakChain)
{
//If exception problem solved Or not Execption
if (nextStep != null)
{
nextStep.HandleRequest(request);
}
else
{
// This is the Workflow last step end.
FinishProccessStatus(request);
}
}
else
{
//the exceptionwas not solved, break the chain
//and rise the last error
if (stepException == null)
{
TraceMessge = string.Format("[{2}] Step Error {0} at process instance {1}: {3}", GetType().FullName, request.ProcessInstanceId, request.ProcessTypeId, "Not Exception Information");
stepException = new Exception(TraceMessge);
}
throw (stepException);
}
}
/// <summary>
/// Check if keep or delete Status on Table
/// Base on Configuration
/// </summary>
/// <param name="request"></param>
protected void FinishProccessStatus(ChainRequest request)
{
string jsonData = Configuration.MBFConfiguration.GetConfigurationValue("roleconfig", "MediaButler.Workflow.ButlerWorkFlowManagerWorkerRole", request.ProcessConfigConn);
IjsonKeyValue x = new jsonKeyValue(jsonData);
if ((string.IsNullOrEmpty(x.Read(Configuration.MBFConfiguration.keepStatusProcess))) || (x.Read(Configuration.MBFConfiguration.keepStatusProcess) == "0"))
{
//Delete track, process finish
ProcessSnapShot mysh = new ProcessSnapShot(request.ProcessTypeId, request.ProcessInstanceId);
mysh.ETag = "*";
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(request.ProcessConfigConn);
CloudTableClient tableClient = storageAccount.CreateCloudTableClient();
CloudTable table = tableClient.GetTableReference(Configuration.MBFConfiguration.ButlerWorkflowStatus);
TableOperation insertOperation = TableOperation.Delete(mysh);
table.Execute(insertOperation);
}
}
/// <summary> /// Compensatory method if you have an error in Step execution /// If you solve the problem and wants continues with the exxecution, you must set request.BreakChain = false Explicit! /// </summary> /// <param name="request"></param> public abstract void HandleCompensation(ChainRequest request);
/// <summary> /// Execute the Stpe logic /// </summary> /// <param name="request">Request sahre by all the steps</param> public abstract void HandleExecute(ChainRequest request);