DecisionTask Poll()
{
Logger.LogMessage("Polling for Decision task ...");
PollForDecisionTaskRequest request = new PollForDecisionTaskRequest()
{
Domain = Constants.SWF_DOMAIN,
TaskList = new TaskList()
{
Name = Constants.SWF_DECIDER_TASKLIST
}
};
PollForDecisionTaskResponse response = _swfClient.PollForDecisionTaskAsync(request).Result;
return response.DecisionTask;
}
/// <summary>
/// Constructor for the workflow event processor.
/// </summary>
/// <param name="decisionTask">Decision task passed in from SWF as decision task response.</param>
/// <param name="workflows">IEnumerable set of string for workflow name and Type for workflow class.</param>
/// <param name="request">The request used to retrieve <paramref name="decisionTask"/>, which will be used to retrieve subsequent history event pages.</param>
/// <param name="swfClient">An SWF client.</param>
public WorkflowEventsProcessor(DecisionTask decisionTask, IEnumerable<KeyValuePair<string, Type>> workflows, PollForDecisionTaskRequest request, IAmazonSimpleWorkflow swfClient)
{
// Decision task can't be null.
if (decisionTask == null)
{
throw new ArgumentNullException("decisionTask");
}
if (request == null)
{
throw new ArgumentNullException("request");
}
// Store the decision task and allocate a new decision context and event dictionary which
// we will use as we walk through the chain of events
_decisionTask = decisionTask;
_request = request;
_decisionContext = new WorkflowDecisionContext();
_swfClient = swfClient;
// Set up our events data structure
_events = new WorkflowEventsIterator(ref decisionTask, _request, _swfClient);
_workflows = (Dictionary<string, Type>) workflows;
}
/// <summary>
/// <para> Used by deciders to get a DecisionTask from the specified decision <c>taskList</c> .
/// A decision task may be returned for any open workflow execution that is using the specified task list. The task includes a paginated
/// view of the history of the workflow execution. The decider should use the workflow type and the history to determine how to properly handle
/// the task. </para> <para> This action initiates a long poll, where the service holds the HTTP connection open and responds as soon a task
/// becomes available. If no decision task is available in the specified task list before the timeout of 60 seconds expires, an empty result is
/// returned. An empty result, in this context, means that a DecisionTask is returned, but that the value of taskToken is an empty string.
/// Deciders should set their client side socket timeout to at least 70 seconds (10 seconds higher than the timeout). </para>
/// <para><b>IMPORTANT:</b> Because the number of workflow history events for a single workflow execution might be very large, the result
/// returned might be split up across a number of pages. To retrieve subsequent pages, make additional calls to PollForDecisionTask using the
/// nextPageToken returned by the initial call. Note that you do not call GetWorkflowExecutionHistory with this nextPageToken. Instead, call
/// PollForDecisionTask again. </para>
/// </summary>
///
/// <param name="pollForDecisionTaskRequest">Container for the necessary parameters to execute the PollForDecisionTask service method on
/// AmazonSimpleWorkflow.</param>
///
/// <returns>The response from the PollForDecisionTask service method, as returned by AmazonSimpleWorkflow.</returns>
///
/// <exception cref="OperationNotPermittedException"/>
/// <exception cref="UnknownResourceException"/>
public PollForDecisionTaskResponse PollForDecisionTask(PollForDecisionTaskRequest pollForDecisionTaskRequest)
{
IAsyncResult asyncResult = invokePollForDecisionTask(pollForDecisionTaskRequest, null, null, true);
return EndPollForDecisionTask(asyncResult);
}
/// <summary>
/// <para> Used by deciders to get a DecisionTask from the specified decision <c>taskList</c> .
/// A decision task may be returned for any open workflow execution that is using the specified task list. The task includes a paginated
/// view of the history of the workflow execution. The decider should use the workflow type and the history to determine how to properly handle
/// the task. </para> <para> This action initiates a long poll, where the service holds the HTTP connection open and responds as soon a task
/// becomes available. If no decision task is available in the specified task list before the timeout of 60 seconds expires, an empty result is
/// returned. An empty result, in this context, means that a DecisionTask is returned, but that the value of taskToken is an empty string.
/// </para> <para><b>IMPORTANT:</b> Deciders should set their client side socket timeout to at least 70 seconds (10 seconds higher than the
/// timeout). </para> <para><b>IMPORTANT:</b> Because the number of workflow history events for a single workflow execution might be very large,
/// the result returned might be split up across a number of pages. To retrieve subsequent pages, make additional calls to PollForDecisionTask
/// using the nextPageToken returned by the initial call. Note that you do not call GetWorkflowExecutionHistory with this nextPageToken.
/// Instead, call PollForDecisionTask again. </para> <para> <b>Access Control</b> </para> <para>You can use IAM policies to control this
/// action's access to Amazon SWF resources as follows:</para>
/// <ul>
/// <li>Use a <c>Resource</c> element with the domain name to limit the action to only specified domains.</li>
/// <li>Use an <c>Action</c> element to allow or deny permission to call this action.</li>
/// <li>Constrain the <c>taskList.name</c> parameter by using a <b>Condition</b> element with the <c>swf:taskList.name</c> key to allow the
/// action to access only certain task lists.</li>
///
/// </ul>
/// <para>If the caller does not have sufficient permissions to invoke the action, or the parameter values fall outside the specified
/// constraints, the action fails by throwing <c>OperationNotPermitted</c> . For details and example IAM policies, see <a href="http://docs.aws.amazon.com/amazonswf/latest/developerguide/swf-dev-iam.html">Using IAM to Manage Access to Amazon SWF Workflows</a>
/// .</para>
/// </summary>
///
/// <param name="pollForDecisionTaskRequest">Container for the necessary parameters to execute the PollForDecisionTask service method on
/// AmazonSimpleWorkflow.</param>
///
/// <returns>The response from the PollForDecisionTask service method, as returned by AmazonSimpleWorkflow.</returns>
///
/// <exception cref="T:Amazon.SimpleWorkflow.Model.OperationNotPermittedException" />
/// <exception cref="T:Amazon.SimpleWorkflow.Model.UnknownResourceException" />
/// <exception cref="T:Amazon.SimpleWorkflow.Model.LimitExceededException" />
/// <param name="cancellationToken">
/// A cancellation token that can be used by other objects or threads to receive notice of cancellation.
/// </param>
public Task<PollForDecisionTaskResponse> PollForDecisionTaskAsync(PollForDecisionTaskRequest pollForDecisionTaskRequest, CancellationToken cancellationToken = default(CancellationToken))
{
var marshaller = new PollForDecisionTaskRequestMarshaller();
var unmarshaller = PollForDecisionTaskResponseUnmarshaller.GetInstance();
return Invoke<IRequest, PollForDecisionTaskRequest, PollForDecisionTaskResponse>(pollForDecisionTaskRequest, marshaller, unmarshaller, signer, cancellationToken);
}
internal PollForDecisionTaskResponse PollForDecisionTask(PollForDecisionTaskRequest request)
{
var task = PollForDecisionTaskAsync(request);
try
{
return task.Result;
}
catch(AggregateException e)
{
ExceptionDispatchInfo.Capture(e.InnerException).Throw();
return null;
}
}
/// <summary>
/// Initiates the asynchronous execution of the PollForDecisionTask operation.
/// <seealso cref="Amazon.SimpleWorkflow.IAmazonSimpleWorkflow"/>
/// </summary>
///
/// <param name="request">Container for the necessary parameters to execute the PollForDecisionTask operation.</param>
/// <param name="cancellationToken">
/// A cancellation token that can be used by other objects or threads to receive notice of cancellation.
/// </param>
/// <returns>The task object representing the asynchronous operation.</returns>
public Task<PollForDecisionTaskResponse> PollForDecisionTaskAsync(PollForDecisionTaskRequest request, System.Threading.CancellationToken cancellationToken = default(CancellationToken))
{
var marshaller = new PollForDecisionTaskRequestMarshaller();
var unmarshaller = PollForDecisionTaskResponseUnmarshaller.Instance;
return InvokeAsync<PollForDecisionTaskRequest,PollForDecisionTaskResponse>(request, marshaller,
unmarshaller, cancellationToken);
}
/// <summary>
/// Used by deciders to get a <a>DecisionTask</a> from the specified decision <code>taskList</code>.
/// A decision task may be returned for any open workflow execution that is using the
/// specified task list. The task includes a paginated view of the history of the workflow
/// execution. The decider should use the workflow type and the history to determine how
/// to properly handle the task.
///
///
/// <para>
/// This action initiates a long poll, where the service holds the HTTP connection open
/// and responds as soon a task becomes available. If no decision task is available in
/// the specified task list before the timeout of 60 seconds expires, an empty result
/// is returned. An empty result, in this context, means that a DecisionTask is returned,
/// but that the value of taskToken is an empty string.
/// </para>
/// <important> Deciders should set their client side socket timeout to at least 70 seconds
/// (10 seconds higher than the timeout). </important> <important> Because the number
/// of workflow history events for a single workflow execution might be very large, the
/// result returned might be split up across a number of pages. To retrieve subsequent
/// pages, make additional calls to <code>PollForDecisionTask</code> using the <code>nextPageToken</code>
/// returned by the initial call. Note that you do <b>not</b> call <code>GetWorkflowExecutionHistory</code>
/// with this <code>nextPageToken</code>. Instead, call <code>PollForDecisionTask</code>
/// again. </important>
/// <para>
/// <b>Access Control</b>
/// </para>
///
/// <para>
/// You can use IAM policies to control this action's access to Amazon SWF resources as
/// follows:
/// </para>
/// <ul> <li>Use a <code>Resource</code> element with the domain name to limit the action
/// to only specified domains.</li> <li>Use an <code>Action</code> element to allow or
/// deny permission to call this action.</li> <li>Constrain the <code>taskList.name</code>
/// parameter by using a <b>Condition</b> element with the <code>swf:taskList.name</code>
/// key to allow the action to access only certain task lists.</li> </ul>
/// <para>
/// If the caller does not have sufficient permissions to invoke the action, or the parameter
/// values fall outside the specified constraints, the action fails by throwing <code>OperationNotPermitted</code>.
/// For details and example IAM policies, see <a href="http://docs.aws.amazon.com/amazonswf/latest/developerguide/swf-dev-iam.html">Using
/// IAM to Manage Access to Amazon SWF Workflows</a>.
/// </para>
/// </summary>
/// <param name="request">Container for the necessary parameters to execute the PollForDecisionTask service method.</param>
///
/// <returns>The response from the PollForDecisionTask service method, as returned by SimpleWorkflow.</returns>
/// <exception cref="LimitExceededException">
/// Returned by any operation if a system imposed limitation has been reached. To address
/// this fault you should either clean up unused resources or increase the limit by contacting
/// AWS.
/// </exception>
/// <exception cref="OperationNotPermittedException">
/// Returned when the caller does not have sufficient permissions to invoke the action.
/// </exception>
/// <exception cref="UnknownResourceException">
/// Returned when the named resource cannot be found with in the scope of this operation
/// (region or domain). This could happen if the named resource was never created or is
/// no longer available for this operation.
/// </exception>
public PollForDecisionTaskResponse PollForDecisionTask(PollForDecisionTaskRequest request)
{
var marshaller = new PollForDecisionTaskRequestMarshaller();
var unmarshaller = PollForDecisionTaskResponseUnmarshaller.Instance;
return Invoke<PollForDecisionTaskRequest,PollForDecisionTaskResponse>(request, marshaller, unmarshaller);
}
internal PollForDecisionTaskPaginator(IAmazonSimpleWorkflow client, PollForDecisionTaskRequest request)
{
this._client = client;
this._request = request;
}
/// <summary>
/// Helper method to poll for decision task from the task list.
/// </summary>
/// <returns>Decision task returned from the long poll</returns>
DecisionTask Poll()
{
Console.WriteLine("Polling for decision task ...");
PollForDecisionTaskRequest request = new PollForDecisionTaskRequest()
{
Domain = CQRS.AWS.Common.Constants.WFDomain,
TaskList = new TaskList()
{
Name = CQRS.AWS.DecisionConsole.Shared.Constants.WFTaskList
}
};
PollForDecisionTaskResponse response = _swfClient.PollForDecisionTask(request);
return response.DecisionTask;
}
/// <summary>
/// <para> Used by deciders to get a DecisionTask from the specified decision <c>taskList</c> .
/// A decision task may be returned for any open workflow execution that is using the specified task list. The task includes a paginated
/// view of the history of the workflow execution. The decider should use the workflow type and the history to determine how to properly handle
/// the task. </para> <para> This action initiates a long poll, where the service holds the HTTP connection open and responds as soon a task
/// becomes available. If no decision task is available in the specified task list before the timeout of 60 seconds expires, an empty result is
/// returned. An empty result, in this context, means that a DecisionTask is returned, but that the value of taskToken is an empty string.
/// </para> <para><b>IMPORTANT:</b> Deciders should set their client side socket timeout to at least 70 seconds (10 seconds higher than the
/// timeout). </para> <para><b>IMPORTANT:</b> Because the number of workflow history events for a single workflow execution might be very large,
/// the result returned might be split up across a number of pages. To retrieve subsequent pages, make additional calls to PollForDecisionTask
/// using the nextPageToken returned by the initial call. Note that you do not call GetWorkflowExecutionHistory with this nextPageToken.
/// Instead, call PollForDecisionTask again. </para> <para> <b>Access Control</b> </para> <para>You can use IAM policies to control this
/// action's access to Amazon SWF resources as follows:</para>
/// <ul>
/// <li>Use a <c>Resource</c> element with the domain name to limit the action to only specified domains.</li>
/// <li>Use an <c>Action</c> element to allow or deny permission to call this action.</li>
/// <li>Constrain the <c>taskList.name</c> parameter by using a <b>Condition</b> element with the <c>swf:taskList.name</c> key to allow the
/// action to access only certain task lists.</li>
///
/// </ul>
/// <para>If the caller does not have sufficient permissions to invoke the action, or the parameter values fall outside the specified
/// constraints, the action fails by throwing <c>OperationNotPermitted</c> . For details and example IAM policies, see <a href="http://docs.aws.amazon.com/amazonswf/latest/developerguide/swf-dev-iam.html">Using IAM to Manage Access to Amazon SWF Workflows</a>
/// .</para>
/// </summary>
///
/// <param name="pollForDecisionTaskRequest">Container for the necessary parameters to execute the PollForDecisionTask service method on
/// AmazonSimpleWorkflow.</param>
///
/// <returns>The response from the PollForDecisionTask service method, as returned by AmazonSimpleWorkflow.</returns>
///
/// <exception cref="T:Amazon.SimpleWorkflow.Model.OperationNotPermittedException" />
/// <exception cref="T:Amazon.SimpleWorkflow.Model.UnknownResourceException" />
/// <exception cref="T:Amazon.SimpleWorkflow.Model.LimitExceededException" />
/// <param name="cancellationToken">
/// A cancellation token that can be used by other objects or threads to receive notice of cancellation.
/// </param>
public async Task<PollForDecisionTaskResponse> PollForDecisionTaskAsync(PollForDecisionTaskRequest pollForDecisionTaskRequest, CancellationToken cancellationToken = default(CancellationToken))
{
var marshaller = new PollForDecisionTaskRequestMarshaller();
var unmarshaller = PollForDecisionTaskResponseUnmarshaller.GetInstance();
var response = await Invoke<IRequest, PollForDecisionTaskRequest, PollForDecisionTaskResponse>(pollForDecisionTaskRequest, marshaller, unmarshaller, signer, cancellationToken)
.ConfigureAwait(continueOnCapturedContext: false);
return response;
}
internal PollForDecisionTaskResponse PollForDecisionTask(PollForDecisionTaskRequest request)
{
var task = PollForDecisionTaskAsync(request);
try
{
return task.Result;
}
catch(AggregateException e)
{
throw e.InnerException;
}
}
/// <summary>
/// Paginator for PollForDecisionTask operation
///</summary>
public IPollForDecisionTaskPaginator PollForDecisionTask(PollForDecisionTaskRequest request)
{
return(new PollForDecisionTaskPaginator(this.client, request));
}
// Simple logic
// Creates four activities at the begining
// Waits for them to complete and completes the workflow
static void Decider()
{
int activityCount = 0; // This refers to total number of activities per workflow
IAmazonSimpleWorkflow swfClient = AWSClientFactory.CreateAmazonSimpleWorkflowClient();
while (true)
{
Console.WriteLine("Decider: Polling for decision task ...");
PollForDecisionTaskRequest request = new PollForDecisionTaskRequest()
{
Domain = domainName,
TaskList = new TaskList() {Name = "HelloWorld"}
};
PollForDecisionTaskResponse response = swfClient.PollForDecisionTask(request);
if (response.DecisionTask.TaskToken == null)
{
Console.WriteLine("Decider: NULL");
continue;
}
int completedActivityTaskCount = 0, totalActivityTaskCount = 0;
foreach (HistoryEvent e in response.DecisionTask.Events)
{
Console.WriteLine("Decider: EventType - " + e.EventType +
", EventId - " + e.EventId);
if (e.EventType == "ActivityTaskCompleted")
completedActivityTaskCount++;
if (e.EventType.Value.StartsWith("Activity"))
totalActivityTaskCount++;
}
Console.WriteLine(".... completedCount=" + completedActivityTaskCount);
List<Decision> decisions = new List<Decision>();
if (totalActivityTaskCount == 0) // Create this only at the begining
{
ScheduleActivity("Activity1A", decisions);
ScheduleActivity("Activity1B", decisions);
ScheduleActivity("Activity2", decisions);
ScheduleActivity("Activity2", decisions);
activityCount = 4;
}
else if (completedActivityTaskCount == activityCount)
{
Decision decision = new Decision()
{
DecisionType = DecisionType.CompleteWorkflowExecution,
CompleteWorkflowExecutionDecisionAttributes =
new CompleteWorkflowExecutionDecisionAttributes {
Result = "{\"Result\":\"WF Complete!\"}"
}
};
decisions.Add(decision);
Console.WriteLine("Decider: WORKFLOW COMPLETE!!!!!!!!!!!!!!!!!!!!!!");
}
RespondDecisionTaskCompletedRequest respondDecisionTaskCompletedRequest =
new RespondDecisionTaskCompletedRequest() {
Decisions = decisions,
TaskToken = response.DecisionTask.TaskToken
};
swfClient.RespondDecisionTaskCompleted(respondDecisionTaskCompletedRequest);
}
}
/// <summary>
/// <para> Used by deciders to get a DecisionTask from the specified decision <c>taskList</c> .
/// A decision task may be returned for any open workflow execution that is using the specified task list. The task includes a paginated
/// view of the history of the workflow execution. The decider should use the workflow type and the history to determine how to properly handle
/// the task. </para> <para> This action initiates a long poll, where the service holds the HTTP connection open and responds as soon a task
/// becomes available. If no decision task is available in the specified task list before the timeout of 60 seconds expires, an empty result is
/// returned. An empty result, in this context, means that a DecisionTask is returned, but that the value of taskToken is an empty string.
/// </para> <para><b>IMPORTANT:</b> Deciders should set their client side socket timeout to at least 70 seconds (10 seconds higher than the
/// timeout). </para> <para><b>IMPORTANT:</b> Because the number of workflow history events for a single workflow execution might be very large,
/// the result returned might be split up across a number of pages. To retrieve subsequent pages, make additional calls to PollForDecisionTask
/// using the nextPageToken returned by the initial call. Note that you do not call GetWorkflowExecutionHistory with this nextPageToken.
/// Instead, call PollForDecisionTask again. </para>
/// </summary>
///
/// <param name="pollForDecisionTaskRequest">Container for the necessary parameters to execute the PollForDecisionTask service method on
/// AmazonSimpleWorkflow.</param>
///
/// <returns>The response from the PollForDecisionTask service method, as returned by AmazonSimpleWorkflow.</returns>
///
/// <exception cref="OperationNotPermittedException"/>
/// <exception cref="UnknownResourceException"/>
public PollForDecisionTaskResponse PollForDecisionTask(PollForDecisionTaskRequest pollForDecisionTaskRequest)
{
IRequest<PollForDecisionTaskRequest> request = new PollForDecisionTaskRequestMarshaller().Marshall(pollForDecisionTaskRequest);
PollForDecisionTaskResponse response = Invoke<PollForDecisionTaskRequest, PollForDecisionTaskResponse> (request, this.signer, PollForDecisionTaskResponseUnmarshaller.GetInstance());
return response;
}
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);
}
IAsyncResult invokePollForDecisionTask(PollForDecisionTaskRequest pollForDecisionTaskRequest, AsyncCallback callback, object state, bool synchronized)
{
IRequest irequest = new PollForDecisionTaskRequestMarshaller().Marshall(pollForDecisionTaskRequest);
var unmarshaller = PollForDecisionTaskResponseUnmarshaller.GetInstance();
AsyncResult result = new AsyncResult(irequest, callback, state, synchronized, signer, unmarshaller);
Invoke(result);
return result;
}
/// <summary>
/// Initiates the asynchronous execution of the PollForDecisionTask operation.
/// <seealso cref="Amazon.SimpleWorkflow.AmazonSimpleWorkflow.PollForDecisionTask"/>
/// </summary>
///
/// <param name="pollForDecisionTaskRequest">Container for the necessary parameters to execute the PollForDecisionTask operation on
/// AmazonSimpleWorkflow.</param>
/// <param name="callback">An AsyncCallback delegate that is invoked when the operation completes.</param>
/// <param name="state">A user-defined state object that is passed to the callback procedure. Retrieve this object from within the callback
/// procedure using the AsyncState property.</param>
///
/// <returns>An IAsyncResult that can be used to poll or wait for results, or both; this value is also needed when invoking
/// EndPollForDecisionTask operation.</returns>
public IAsyncResult BeginPollForDecisionTask(PollForDecisionTaskRequest pollForDecisionTaskRequest, AsyncCallback callback, object state)
{
return invokePollForDecisionTask(pollForDecisionTaskRequest, callback, state, false);
}
/// <summary>
/// Initiates the asynchronous execution of the PollForDecisionTask operation.
/// </summary>
///
/// <param name="request">Container for the necessary parameters to execute the PollForDecisionTask operation on AmazonSimpleWorkflowClient.</param>
/// <param name="callback">An AsyncCallback delegate that is invoked when the operation completes.</param>
/// <param name="state">A user-defined state object that is passed to the callback procedure. Retrieve this object from within the callback
/// procedure using the AsyncState property.</param>
///
/// <returns>An IAsyncResult that can be used to poll or wait for results, or both; this value is also needed when invoking EndPollForDecisionTask
/// operation.</returns>
public IAsyncResult BeginPollForDecisionTask(PollForDecisionTaskRequest request, AsyncCallback callback, object state)
{
var marshaller = new PollForDecisionTaskRequestMarshaller();
var unmarshaller = PollForDecisionTaskResponseUnmarshaller.Instance;
return BeginInvoke<PollForDecisionTaskRequest>(request, marshaller, unmarshaller,
callback, state);
}