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Amazon Simple Workflow Service
API Reference (API Version 2012-01-25)

CountPendingDecisionTasks

Returns the estimated number of decision tasks in the specified task list. The count returned is an approximation and isn't guaranteed to be exact. If you specify a task list that no decision task was ever scheduled in then 0 is returned.

Access Control

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

  • Use a Resource element with the domain name to limit the action to only specified domains.

  • Use an Action element to allow or deny permission to call this action.

  • Constrain the taskList.name parameter by using a Condition element with the swf:taskList.name key to allow the action to access only certain task lists.

If the caller doesn't 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 is set to OPERATION_NOT_PERMITTED. For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF Workflows in the Amazon SWF Developer Guide.

Request Syntax

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{ "domain": "string", "taskList": { "name": "string" } }

Request Parameters

For information about the parameters that are common to all actions, see Common Parameters.

The request accepts the following data in JSON format.

domain

The name of the domain that contains the task list.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 256.

Required: Yes

taskList

The name of the task list.

Type: TaskList object

Required: Yes

Response Syntax

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{ "count": number, "truncated": boolean }

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

count

The number of tasks in the task list.

Type: Integer

Valid Range: Minimum value of 0.

truncated

If set to true, indicates that the actual count was more than the maximum supported by this API and the count returned is the truncated value.

Type: Boolean

Errors

For information about the errors that are common to all actions, see Common Errors.

OperationNotPermittedFault

Returned when the caller doesn't have sufficient permissions to invoke the action.

HTTP Status Code: 400

UnknownResourceFault

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.

HTTP Status Code: 400

Example

CountPendingDecisionTasks Example

Sample Request

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POST / HTTP/1.1 Host: swf.us-east-1.amazonaws.com User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.25) Gecko/20111212 Firefox/3.6.25 ( .NET CLR 3.5.30729; .NET4.0E) Accept: application/json, text/javascript, */* Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 115 Connection: keep-alive Content-Type: application/x-amz-json-1.0 X-Requested-With: XMLHttpRequest X-Amz-Date: Sun, 15 Jan 2012 23:25:57 GMT X-Amz-Target: SimpleWorkflowService.CountPendingDecisionTasks Content-Encoding: amz-1.0 X-Amzn-Authorization: AWS3 AWSAccessKeyId=AKIAIOSFODNN7EXAMPLE,Algorithm=HmacSHA256,SignedHeaders=Host;X-Amz-Date;X-Amz-Target;Content-Encoding,Signature=i9tUkWnZBLfn/T6BOymajCtwArAll6Stuh1x2C4dbsE= Referer: http://swf.us-east-1.amazonaws.com/explorer/index.html Content-Length: 70 Pragma: no-cache Cache-Control: no-cache {"domain": "867530901", "taskList": {"name": "specialTaskList"} }

Sample Response

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HTTP/1.1 200 OK Content-Length: 29 Content-Type: application/json x-amzn-RequestId: 4718a364-3fd0-11e1-9914-a356b6ea8bdf {"count": 2, "truncated": false}

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: