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

RequestCancelWorkflowExecution

Records a WorkflowExecutionCancelRequested event in the currently running workflow execution identified by the given domain, workflowId, and runId. This logically requests the cancellation of the workflow execution as a whole. It is up to the decider to take appropriate actions when it receives an execution history with this event.

Note

If the runId is not specified, the WorkflowExecutionCancelRequested event is recorded in the history of the current open workflow execution with the specified workflowId in the domain.

Note

Because this action allows the workflow to properly clean up and gracefully close, it should be used instead of TerminateWorkflowExecution when possible.

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.

  • You cannot use an IAM policy to constrain this action's parameters.

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.

Request Syntax

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{ "domain": "string", "runId": "string", "workflowId": "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 containing the workflow execution to cancel.

Type: String

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

Required: Yes

runId

The runId of the workflow execution to cancel.

Type: String

Length Constraints: Maximum length of 64.

Required: No

workflowId

The workflowId of the workflow execution to cancel.

Type: String

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

Required: Yes

Response Elements

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

Errors

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

OperationNotPermittedFault

Returned when the caller does not 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

RequestCancelWorkflowExecution 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: Mon, 16 Jan 2012 04:49:06 GMT X-Amz-Target: SimpleWorkflowService.RequestCancelWorkflowExecution Content-Encoding: amz-1.0 X-Amzn-Authorization: AWS3 AWSAccessKeyId=AKIAIOSFODNN7EXAMPLE,Algorithm=HmacSHA256,SignedHeaders=Host;X-Amz-Date;X-Amz-Target;Content-Encoding,Signature=xODwV3kbpJbWVa6bQiV2zQAw9euGI3uXI82urc+bVeo= Referer: http://swf.us-east-1.amazonaws.com/explorer/index.html Content-Length: 106 Pragma: no-cache Cache-Control: no-cache {"domain": "867530901", "workflowId": "20110927-T-1", "runId": "94861fda-a714-4126-95d7-55ba847da8ab"}

Sample Response

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HTTP/1.1 200 OK Content-Length: 0 Content-Type: application/json x-amzn-RequestId: 6bd0627e-3ffd-11e1-9b11-7182192d0b57

See Also

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