private static void StartEchoWorkflow()
{
var client = new AmazonSimpleWorkflowClient();
var activity = WorkflowFactory.CreateActivity<string, string>("echo", Echo, 60, 10, 10, 20)
.Complete();
var workflow = WorkflowFactory.CreateWorkflow("theburningmonk.com", "echo_cs", "1")
.Attach(activity)
.Complete();
workflow.Start(client);
}
private static void StartCountHtmlElementsWorkflow()
{
var client = new AmazonSimpleWorkflowClient();
var echo = WorkflowFactory.CreateActivity<string, string>("echo", Echo, 60, 10, 10, 20)
.Complete();
var countDiv = WorkflowFactory.CreateActivity<string, int>("count_divs", address => CountMatches("<div", address), 60, 10, 10, 20)
.WithDescription("count the number of <div> elements")
.Complete();
var countScripts = WorkflowFactory.CreateActivity<string, int>("count_scripts", address => CountMatches("<script", address), 60, 10, 10, 20)
.WithDescription("count the number of <script> elements")
.Complete();
var countSpans = WorkflowFactory.CreateActivity<string, int>("count_spans", address => CountMatches("<span", address), 60, 10, 10, 20)
.WithDescription("count the number of <span> elements")
.Complete();
var workflow = WorkflowFactory.CreateWorkflow("theburningmonk.com", "count_html_elements_cs", "1")
.Attach(echo)
.Attach(new[] { countDiv, countScripts, countSpans }, MatchesReducer)
.Attach(echo)
.Complete();
workflow.Start(client);
}
public static string GetServiceOutput()
{
var sb = new StringBuilder(1024);
using (var sr = new StringWriter(sb))
{
sr.WriteLine("===============================");
sr.WriteLine("| AWS Simple Workflow Service |");
sr.WriteLine("===============================");
try
{
// Print the available domains, workflows and activities. Region endpoint depends on where
// you chose to set up your workflow domain
var swfClient = new AmazonSimpleWorkflowClient(RegionEndpoint.USWest2);
sr.WriteLine();
var listDomainRequest = new ListDomainsRequest
{
RegistrationStatus = "REGISTERED"
};
var listDomainResponse = swfClient.ListDomains(listDomainRequest);
foreach (var domain in listDomainResponse.DomainInfos.Infos)
{
sr.WriteLine("[" + domain.Name + "]");
sr.WriteLine("status: " + domain.Status);
sr.WriteLine("description: " + domain.Description);
sr.WriteLine("\n WORKFLOWS");
var listWorkflowRequest = new ListWorkflowTypesRequest
{
Domain = domain.Name,
RegistrationStatus = "REGISTERED"
};
var listWorkflowTypesResponse = swfClient.ListWorkflowTypes(listWorkflowRequest);
foreach (
var workflow in
listWorkflowTypesResponse.WorkflowTypeInfos.TypeInfos)
{
sr.WriteLine(" [" + workflow.WorkflowType.Name + "] (" + workflow.WorkflowType.Version + ") " + workflow.Status);
sr.WriteLine(" creation: " + workflow.CreationDate);
sr.WriteLine(" deprecation: " + workflow.DeprecationDate);
sr.WriteLine(" description:" + TrimStringToLength(workflow.Description, 60, "", " "));
sr.WriteLine();
}
sr.WriteLine("\n ACTIVITIES");
var listActivityRequest = new ListActivityTypesRequest
{
Domain = domain.Name,
RegistrationStatus = "REGISTERED"
};
var listActivityResponse = swfClient.ListActivityTypes(listActivityRequest);
foreach (
var activity in listActivityResponse.ActivityTypeInfos.TypeInfos)
{
sr.WriteLine(" [" + activity.ActivityType.Name + "] (" + activity.ActivityType.Version + ") " + activity.Status);
sr.WriteLine(" creation: " + activity.CreationDate);
sr.WriteLine(" deprecation: " + activity.DeprecationDate);
sr.WriteLine(" description:" + TrimStringToLength(activity.Description, 60, "", " "));
sr.WriteLine();
}
}
}
catch (AmazonSimpleWorkflowException ex)
{
if (ex.ErrorCode != null && ex.ErrorCode.Equals("AuthFailure"))
{
sr.WriteLine("The account you are using is not signed up for Amazon SWF.");
sr.WriteLine("You can sign up for Amazon SWF at http://aws.amazon.com/swf");
}
else
{
sr.WriteLine("Caught Exception: " + ex.Message);
sr.WriteLine("Response Status Code: " + ex.StatusCode);
sr.WriteLine("Error Code: " + ex.ErrorCode);
sr.WriteLine("Error Type: " + ex.ErrorType);
sr.WriteLine("Request ID: " + ex.RequestId);
sr.WriteLine("Data: " + ex.Data);
sr.WriteLine("Stacktrace: " + ex.StackTrace);
}
}
sr.WriteLine();
}
return sb.ToString();
}
public static void Main(string[] args)
{
// Define the workflows that we know of that event processor will be handling
var workflows = new Dictionary<string, Type>
{
{"CustomerOrderWorkflow", typeof (CustomerOrderWorkflow)},
{"VerifyCustomerWorkflow", typeof (VerifyCustomerWorkflow)}
};
// Stopwatch to see how well we are performing
var stopwatch = new Stopwatch();
// We will use this ID as our decision task ID and activity task ID to identify ourselves when polling for
// decision and activity tasks.
var workflowWorkerIdentity = Guid.NewGuid();
// Print out our AWS SWF domains, workflows and activities
Console.Write(GetServiceOutput());
var loop = true;
do
{
// Our super simple application menu
Console.WriteLine("");
Console.WriteLine("=============");
Console.WriteLine("| Main Menu |");
Console.WriteLine("=============");
Console.WriteLine("[1] Submit a new workflow");
Console.WriteLine("[2] Wait for decide using a decision task");
Console.WriteLine("[3] Wait for and do some work for an activity task");
Console.WriteLine("[4] Quit");
Console.Write("\nChoice: ");
var key = Console.ReadLine();
if (String.IsNullOrEmpty(key))
{
continue;
}
switch (key)
{
// Initiate a workflow execution
case "1":
{
Console.WriteLine("Option [1] selected - Submit a new workflow");
// SWF client is disposable, so dispose it
using (var swfClient = new AmazonSimpleWorkflowClient(RegionEndpoint.USWest2))
{
// Our simple property bag: we just need to the email for the account
var propertyBag = new Dictionary<string, object> { { "SampleOrderNumber", "12345" } };
// Setup the workflow request
var workflowRequest = new StartWorkflowExecutionRequest
{
Domain = "demo-domain",
WorkflowId = Guid.NewGuid().ToString(),
WorkflowType = new WorkflowType
{
Name = "CustomerOrderWorkflow",
Version = "1.0"
},
Input = JsonConvert.SerializeObject(propertyBag)
};
try
{
// Call AWS SWF and submit the workflow request
swfClient.StartWorkflowExecution(workflowRequest);
}
catch (AmazonSimpleWorkflowException ex)
{
Console.WriteLine("Caught Exception: " + ex.Message);
Console.WriteLine("Response Status Code: " + ex.StatusCode);
Console.WriteLine("Error Code: " + ex.ErrorCode);
Console.WriteLine("Error Type: " + ex.ErrorType);
Console.WriteLine("Request ID: " + ex.RequestId);
Console.WriteLine("Data: " + ex.Data);
Console.WriteLine("Stacktrace: " + ex.StackTrace);
}
}
}
break;
// Poll for decision task
case "2":
{
Console.WriteLine("Option [2] selected - Wait for decide using a decision task");
Console.WriteLine("Waiting...");
// SWF client is disposable, so dispose it
using (var swfClient = new AmazonSimpleWorkflowClient(RegionEndpoint.USWest2))
{
try
{
// Setup the decision request
var decisionTaskRequest = new PollForDecisionTaskRequest
{
Domain = "demo-domain",
Identity = workflowWorkerIdentity.ToString(),
TaskList = new TaskList { Name = "DeciderTaskList-Default" }
};
// Call AWS SWF and wait for (default timeout: 60 secs) a decision task
var decisionTaskResponse = swfClient.PollForDecisionTask(decisionTaskRequest);
// Task token being an empty string means there are no tasks available and
// we are past the 60 seconds that AWS holds a connection in case a task
// becomes available. If this is the case, we simply retry.
var taskToken =
decisionTaskResponse.DecisionTask.TaskToken;
if (!String.IsNullOrEmpty(taskToken))
{
// We have a valid task, do something...
var decisionTask =
decisionTaskResponse.DecisionTask;
switch (decisionTask.WorkflowType.Name)
{
case "CustomerOrderWorkflow":
case "VerifyCustomerWorkflow":
{
Debug.Assert(decisionTask.WorkflowType.Version == "1.0");
}
break;
default:
Console.WriteLine("ERROR: Unknown workflow.");
break;
}
// Define a new WorkflowEventsProcessor object and let it make the decision!
stopwatch.Start();
var workflowProcessor = new WorkflowEventsProcessor(decisionTask, workflows, decisionTaskRequest, swfClient);
var decisionRequest = workflowProcessor.Decide();
stopwatch.Stop();
Console.WriteLine(">>> Decision(s) made in " + stopwatch.ElapsedMilliseconds + "ms");
// We have our decision, send it away and do something
// more productive with the response
swfClient.RespondDecisionTaskCompleted(decisionRequest);
}
}
catch (AmazonSimpleWorkflowException ex)
{
Console.WriteLine("Caught Exception: " + ex.Message);
Console.WriteLine("Response Status Code: " + ex.StatusCode);
Console.WriteLine("Error Code: " + ex.ErrorCode);
Console.WriteLine("Error Type: " + ex.ErrorType);
Console.WriteLine("Request ID: " + ex.RequestId);
Console.WriteLine("Data: " + ex.Data);
Console.WriteLine("Stacktrace: " + ex.StackTrace);
}
}
}
break;
// Poll for activity task
case "3":
{
Console.WriteLine("Option [3] selected - Wait for decide using a activity task");
Console.WriteLine("Waiting...");
// SWF client is disposable, so dispose it
using (var swfClient = new AmazonSimpleWorkflowClient(RegionEndpoint.USWest2))
{
try
{
// Setup the activity request
var activityTaskRequest = new PollForActivityTaskRequest
{
Domain = "demo-domain",
Identity = workflowWorkerIdentity.ToString(),
TaskList = new TaskList { Name = "ActivityTaskList-Default" }
};
// Call AWS SWF and wait for (default timeout: 60 secs) a activity task
var activityTaskResponse = swfClient.PollForActivityTask(activityTaskRequest);
// Task token being an empty string means there are no tasks available and
// we are past the 60 seconds that AWS holds a connection in case a task
// becomes available. If this is the case, we simply retry.
var taskToken =
activityTaskResponse.ActivityTask.TaskToken;
if (!String.IsNullOrEmpty(taskToken))
{
// We have a valid task, do something...
var activityTask =
activityTaskResponse.ActivityTask;
Console.WriteLine("\n");
Console.WriteLine(">>> Activity: " + activityTask.ActivityType.Name);
// In the real world we would define the activity code in a separate object
// and fire off a thread to actually work on it but in this case we are just
// testing the workflow so this suffices
switch (activityTask.ActivityType.Name)
{
// CustomerOrderWorkflow activities
case "VerifyOrder":
case "ShipOrder":
{
Debug.Assert(activityTask.ActivityType.Version == "1.0");
}
break;
// VerifyCustomerWorkflow activities
case "VerifyCustomerAddress":
case "CheckFraudDB":
case "ChargeCreditCard":
{
Debug.Assert(activityTask.ActivityType.Version == "1.0");
}
break;
default:
Console.WriteLine("ERROR: Unknown activity.");
break;
}
var activityCompletedRequest = new RespondActivityTaskCompletedRequest
{
TaskToken = activityTask.TaskToken,
Result = activityTask.Input
};
// Completion request setup complete, send it away. NOTE: Do something more
// productive with the response
swfClient.RespondActivityTaskCompleted(activityCompletedRequest);
//var activityFailedRequest = new RespondActivityTaskFailedRequest
// {
// TaskToken = activityTask.TaskToken,
// Details = "Test failure."
// };
//// Completion request setup complete, send it away. NOTE: Do something more
//// productive with the response
//swfClient.RespondActivityTaskFailed(activityFailedRequest);
}
}
catch (AmazonSimpleWorkflowException ex)
{
Console.WriteLine("Caught Exception: " + ex.Message);
Console.WriteLine("Response Status Code: " + ex.StatusCode);
Console.WriteLine("Error Code: " + ex.ErrorCode);
Console.WriteLine("Error Type: " + ex.ErrorType);
Console.WriteLine("Request ID: " + ex.RequestId);
Console.WriteLine("Data: " + ex.Data);
Console.WriteLine("Stacktrace: " + ex.StackTrace);
}
}
}
break;
case "4":
// Quit
loop = false;
break;
default:
Console.WriteLine("ERROR: Unknown command.");
break;
}
} while (loop);
}
/// <summary>
/// This method starts the workflow execution.
/// </summary>
/// <param name="bucket"></param>
/// <param name="filepath"></param>
public void StartWorkflowExecution(int RequestId)
{
System.Threading.Tasks.Task.Run(() =>
{
try
{
//IAmazonS3 s3Client = new AmazonS3Client();
IAmazonSimpleWorkflow swfClient = new AmazonSimpleWorkflowClient();
//this._console.WriteLine("Create bucket if it doesn't exist");
// Make sure bucket exists
//s3Client.PutBucket(new PutBucketRequest
//{
// BucketName = bucket,
// UseClientRegion = true
//});
//this._console.WriteLine("Uploading image to S3");
// Upload the image to S3 before starting the execution
//PutObjectRequest putRequest = new PutObjectRequest
//{
// BucketName = bucket,
// FilePath = filepath,
// Key = Path.GetFileName(filepath)
//};
//// Add upload progress callback to print every increment of 10 percent uploaded to the console.
//int currentPercent = -1;
//putRequest.StreamTransferProgress = new EventHandler<Amazon.Runtime.StreamTransferProgressArgs>((x, args) =>
//{
// if (args.PercentDone == currentPercent)
// return;
// currentPercent = args.PercentDone;
// if (currentPercent % 10 == 0)
// {
// this._console.WriteLine(string.Format("... Uploaded {0} %", currentPercent));
// }
//});
//s3Client.PutObject(putRequest);
// Setup the input for the workflow execution that tells the execution what bukcet and object to use.
Common.WorkflowExecutionStartedInput input = new Common.WorkflowExecutionStartedInput
{
RequestId = RequestId
};
Console.WriteLine("Start workflow execution");
// Start the workflow execution
swfClient.StartWorkflowExecution(new StartWorkflowExecutionRequest()
{
//Serialize input to a string
Input = Common.Utils.SerializeToJSON<Common.WorkflowExecutionStartedInput>(input),
//Unique identifier for the execution
WorkflowId = DateTime.Now.Ticks.ToString(),
Domain = Common.Constants.WFDomain,
WorkflowType = new WorkflowType()
{
Name = Shared.Constants.WFWorkflow,
Version = Shared.Constants.WFWorkflowVersion
}
});
}
catch (Exception e)
{
Console.WriteLine("Error starting workflow execution: " + e.Message);
}
});
}