AWS SDK Version 2 for .NET
API Reference

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.NET Framework 3.5
 
Used by deciders to get a DecisionTask from the specified decision taskList. 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.

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).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.

Access Control

You can use IAM policies to control this action's access to Amazon SWF resources as follows:

If the caller does not have sufficient permissions to invoke the action, or the parameter values fall outside the specified constraints, the action fails. The associated event attribute's cause parameter will be set to OPERATION_NOT_PERMITTED. For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF Workflows.

Namespace: Amazon.SimpleWorkflow
Assembly: AWSSDK.dll
Version: (assembly version)

Syntax

C#
public virtual PollForDecisionTaskResponse PollForDecisionTask(
         PollForDecisionTaskRequest request
)

Parameters

request
Type: Amazon.SimpleWorkflow.Model.PollForDecisionTaskRequest

Container for the necessary parameters to execute the PollForDecisionTask service method.

Return Value
Type: Amazon.SimpleWorkflow.Model.PollForDecisionTaskResponse
The response from the PollForDecisionTask service method, as returned by SimpleWorkflow.

Exceptions

ExceptionCondition
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.
OperationNotPermittedException Returned when the caller does not have sufficient permissions to invoke the action.
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.

Version Information

.NET Framework:
Supported in: 4.5, 4.0, 3.5