AWS SDK for Go (PILOT)
API Reference

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Decision

import "github.com/aws/aws-sdk-go/service/swf"

type Decision struct { CancelTimerDecisionAttributes *CancelTimerDecisionAttributes `locationName:"cancelTimerDecisionAttributes" type:"structure"` CancelWorkflowExecutionDecisionAttributes *CancelWorkflowExecutionDecisionAttributes `locationName:"cancelWorkflowExecutionDecisionAttributes" type:"structure"` CompleteWorkflowExecutionDecisionAttributes *CompleteWorkflowExecutionDecisionAttributes `locationName:"completeWorkflowExecutionDecisionAttributes" type:"structure"` ContinueAsNewWorkflowExecutionDecisionAttributes *ContinueAsNewWorkflowExecutionDecisionAttributes `locationName:"continueAsNewWorkflowExecutionDecisionAttributes" type:"structure"` DecisionType *string `locationName:"decisionType" type:"string" required:"true" enum:"DecisionType"` FailWorkflowExecutionDecisionAttributes *FailWorkflowExecutionDecisionAttributes `locationName:"failWorkflowExecutionDecisionAttributes" type:"structure"` RecordMarkerDecisionAttributes *RecordMarkerDecisionAttributes `locationName:"recordMarkerDecisionAttributes" type:"structure"` RequestCancelActivityTaskDecisionAttributes *RequestCancelActivityTaskDecisionAttributes `locationName:"requestCancelActivityTaskDecisionAttributes" type:"structure"` RequestCancelExternalWorkflowExecutionDecisionAttributes *RequestCancelExternalWorkflowExecutionDecisionAttributes `locationName:"requestCancelExternalWorkflowExecutionDecisionAttributes" type:"structure"` ScheduleActivityTaskDecisionAttributes *ScheduleActivityTaskDecisionAttributes `locationName:"scheduleActivityTaskDecisionAttributes" type:"structure"` ScheduleLambdaFunctionDecisionAttributes *ScheduleLambdaFunctionDecisionAttributes `locationName:"scheduleLambdaFunctionDecisionAttributes" type:"structure"` SignalExternalWorkflowExecutionDecisionAttributes *SignalExternalWorkflowExecutionDecisionAttributes `locationName:"signalExternalWorkflowExecutionDecisionAttributes" type:"structure"` StartChildWorkflowExecutionDecisionAttributes *StartChildWorkflowExecutionDecisionAttributes `locationName:"startChildWorkflowExecutionDecisionAttributes" type:"structure"` StartTimerDecisionAttributes *StartTimerDecisionAttributes `locationName:"startTimerDecisionAttributes" type:"structure"` }

Specifies a decision made by the decider. A decision can be one of these types:

  • CancelTimer – Cancels a previously started timer and records a TimerCanceled event in the history.

  • CancelWorkflowExecution – Closes the workflow execution and records a WorkflowExecutionCanceled event in the history.

  • CompleteWorkflowExecution – Closes the workflow execution and records a WorkflowExecutionCompleted event in the history .

  • ContinueAsNewWorkflowExecution – Closes the workflow execution and starts a new workflow execution of the same type using the same workflow ID and a unique run Id. A WorkflowExecutionContinuedAsNew event is recorded in the history.

  • FailWorkflowExecution – Closes the workflow execution and records a WorkflowExecutionFailed event in the history.

  • RecordMarker – Records a MarkerRecorded event in the history. Markers can be used for adding custom information in the history for instance to let deciders know that they don't need to look at the history beyond the marker event.

  • RequestCancelActivityTask – Attempts to cancel a previously scheduled activity task. If the activity task was scheduled but has not been assigned to a worker, then it is canceled. If the activity task was already assigned to a worker, then the worker is informed that cancellation has been requested in the response to RecordActivityTaskHeartbeat.

  • RequestCancelExternalWorkflowExecution – Requests that a request be made to cancel the specified external workflow execution and records a RequestCancelExternalWorkflowExecutionInitiated event in the history.

  • ScheduleActivityTask – Schedules an activity task.

  • SignalExternalWorkflowExecution – Requests a signal to be delivered to the specified external workflow execution and records a SignalExternalWorkflowExecutionInitiated event in the history.

  • StartChildWorkflowExecution – Requests that a child workflow execution be started and records a StartChildWorkflowExecutionInitiated event in the history. The child workflow execution is a separate workflow execution with its own history.

  • StartTimer – Starts a timer for this workflow execution and records a TimerStarted event in the history. This timer fires after the specified delay and record a TimerFired event.

Access Control

If you grant permission to use RespondDecisionTaskCompleted, you can use IAM policies to express permissions for the list of decisions returned by this action as if they were members of the API. Treating decisions as a pseudo API maintains a uniform conceptual model and helps keep policies readable. For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF Workflows (https://docs.aws.amazon.com/amazonswf/latest/developerguide/swf-dev-iam.html) in the Amazon SWF Developer Guide.

Decision Failure

Decisions can fail for several reasons

  • The ordering of decisions should follow a logical flow. Some decisions might not make sense in the current context of the workflow execution and therefore fails.

  • A limit on your account was reached.

  • The decision lacks sufficient permissions.

One of the following events might be added to the history to indicate an error. The event attribute's cause parameter indicates the cause. If cause is set to OPERATION_NOT_PERMITTED, the decision failed because it lacked sufficient permissions. For details and example IAM policies, see Using IAM to Manage Access to Amazon SWF Workflows (https://docs.aws.amazon.com/amazonswf/latest/developerguide/swf-dev-iam.html) in the Amazon SWF Developer Guide.

  • ScheduleActivityTaskFailed – A ScheduleActivityTask decision failed. This could happen if the activity type specified in the decision isn't registered, is in a deprecated state, or the decision isn't properly configured.

  • RequestCancelActivityTaskFailed – A RequestCancelActivityTask decision failed. This could happen if there is no open activity task with the specified activityId.

  • StartTimerFailed – A StartTimer decision failed. This could happen if there is another open timer with the same timerId.

  • CancelTimerFailed – A CancelTimer decision failed. This could happen if there is no open timer with the specified timerId.

  • StartChildWorkflowExecutionFailed – A StartChildWorkflowExecution decision failed. This could happen if the workflow type specified isn't registered, is deprecated, or the decision isn't properly configured.

  • SignalExternalWorkflowExecutionFailed – A SignalExternalWorkflowExecution decision failed. This could happen if the workflowID specified in the decision was incorrect.

  • RequestCancelExternalWorkflowExecutionFailed – A RequestCancelExternalWorkflowExecution decision failed. This could happen if the workflowID specified in the decision was incorrect.

  • CancelWorkflowExecutionFailed – A CancelWorkflowExecution decision failed. This could happen if there is an unhandled decision task pending in the workflow execution.

  • CompleteWorkflowExecutionFailed – A CompleteWorkflowExecution decision failed. This could happen if there is an unhandled decision task pending in the workflow execution.

  • ContinueAsNewWorkflowExecutionFailed – A ContinueAsNewWorkflowExecution decision failed. This could happen if there is an unhandled decision task pending in the workflow execution or the ContinueAsNewWorkflowExecution decision was not configured correctly.

  • FailWorkflowExecutionFailed – A FailWorkflowExecution decision failed. This could happen if there is an unhandled decision task pending in the workflow execution.

The preceding error events might occur due to an error in the decider logic, which might put the workflow execution in an unstable state The cause field in the event structure for the error event indicates the cause of the error.

A workflow execution may be closed by the decider by returning one of the following decisions when completing a decision task: CompleteWorkflowExecution, FailWorkflowExecution, CancelWorkflowExecution and ContinueAsNewWorkflowExecution. An UnhandledDecision fault is returned if a workflow closing decision is specified and a signal or activity event had been added to the history while the decision task was being performed by the decider. Unlike the above situations which are logic issues, this fault is always possible because of race conditions in a distributed system. The right action here is to call RespondDecisionTaskCompleted without any decisions. This would result in another decision task with these new events included in the history. The decider should handle the new events and may decide to close the workflow execution.

How to Code a Decision

You code a decision by first setting the decision type field to one of the above decision values, and then set the corresponding attributes field shown below:

  • ScheduleActivityTaskDecisionAttributes

  • RequestCancelActivityTaskDecisionAttributes

  • CompleteWorkflowExecutionDecisionAttributes

  • FailWorkflowExecutionDecisionAttributes

  • CancelWorkflowExecutionDecisionAttributes

  • ContinueAsNewWorkflowExecutionDecisionAttributes

  • RecordMarkerDecisionAttributes

  • StartTimerDecisionAttributes

  • CancelTimerDecisionAttributes

  • SignalExternalWorkflowExecutionDecisionAttributes

  • RequestCancelExternalWorkflowExecutionDecisionAttributes

  • StartChildWorkflowExecutionDecisionAttributes

CancelTimerDecisionAttributes

Provides the details of the CancelTimer decision.

Access Control

You can use IAM policies to control this decision'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 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 (https://docs.aws.amazon.com/amazonswf/latest/developerguide/swf-dev-iam.html) in the Amazon SWF Developer Guide.

CancelWorkflowExecutionDecisionAttributes

Provides the details of the CancelWorkflowExecution decision.

Access Control

You can use IAM policies to control this decision'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 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 (https://docs.aws.amazon.com/amazonswf/latest/developerguide/swf-dev-iam.html) in the Amazon SWF Developer Guide.

CompleteWorkflowExecutionDecisionAttributes

Provides the details of the CompleteWorkflowExecution decision.

Access Control

You can use IAM policies to control this decision'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 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 (https://docs.aws.amazon.com/amazonswf/latest/developerguide/swf-dev-iam.html) in the Amazon SWF Developer Guide.

ContinueAsNewWorkflowExecutionDecisionAttributes

Provides the details of the ContinueAsNewWorkflowExecution decision.

Access Control

You can use IAM policies to control this decision'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 following parameters by using a Condition element with the appropriate keys.

tag – A tag used to identify the workflow execution

taskList – String constraint. The key is swf:taskList.name.

workflowType.version – String constraint. The key is swf:workflowType.version.

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 (https://docs.aws.amazon.com/amazonswf/latest/developerguide/swf-dev-iam.html) in the Amazon SWF Developer Guide.

DecisionType

Type: *string

Specifies the type of the decision.

DecisionType is a required field

FailWorkflowExecutionDecisionAttributes

Provides the details of the FailWorkflowExecution decision.

Access Control

You can use IAM policies to control this decision'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 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 (https://docs.aws.amazon.com/amazonswf/latest/developerguide/swf-dev-iam.html) in the Amazon SWF Developer Guide.

RecordMarkerDecisionAttributes

Provides the details of the RecordMarker decision.

Access Control

You can use IAM policies to control this decision'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 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 (https://docs.aws.amazon.com/amazonswf/latest/developerguide/swf-dev-iam.html) in the Amazon SWF Developer Guide.

RequestCancelActivityTaskDecisionAttributes

Provides the details of the RequestCancelActivityTask decision.

Access Control

You can use IAM policies to control this decision'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 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 (https://docs.aws.amazon.com/amazonswf/latest/developerguide/swf-dev-iam.html) in the Amazon SWF Developer Guide.

RequestCancelExternalWorkflowExecutionDecisionAttributes

Provides the details of the RequestCancelExternalWorkflowExecution decision.

Access Control

You can use IAM policies to control this decision'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 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 (https://docs.aws.amazon.com/amazonswf/latest/developerguide/swf-dev-iam.html) in the Amazon SWF Developer Guide.

ScheduleActivityTaskDecisionAttributes

Provides the details of the ScheduleActivityTask decision.

Access Control

You can use IAM policies to control this decision'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 following parameters by using a Condition element with the appropriate keys.

activityType.name – String constraint. The key is swf:activityType.name.

activityType.version – String constraint. The key is swf:activityType.version.

taskList – String constraint. The key is swf:taskList.name.

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 (https://docs.aws.amazon.com/amazonswf/latest/developerguide/swf-dev-iam.html) in the Amazon SWF Developer Guide.

ScheduleLambdaFunctionDecisionAttributes

Decision attributes specified in scheduleLambdaFunctionDecisionAttributes within the list of decisions decisions passed to RespondDecisionTaskCompleted.

SignalExternalWorkflowExecutionDecisionAttributes

Provides the details of the SignalExternalWorkflowExecution decision.

Access Control

You can use IAM policies to control this decision'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 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 (https://docs.aws.amazon.com/amazonswf/latest/developerguide/swf-dev-iam.html) in the Amazon SWF Developer Guide.

StartChildWorkflowExecutionDecisionAttributes

Provides the details of the StartChildWorkflowExecution decision.

Access Control

You can use IAM policies to control this decision'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 following parameters by using a Condition element with the appropriate keys.

tagList.member.N – The key is "swf:tagList.N" where N is the tag number from

0 to 4, inclusive.

taskList – String constraint. The key is swf:taskList.name.

workflowType.name – String constraint. The key is swf:workflowType.name.

workflowType.version – String constraint. The key is swf:workflowType.version.

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 (https://docs.aws.amazon.com/amazonswf/latest/developerguide/swf-dev-iam.html) in the Amazon SWF Developer Guide.

StartTimerDecisionAttributes

Provides the details of the StartTimer decision.

Access Control

You can use IAM policies to control this decision'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 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 (https://docs.aws.amazon.com/amazonswf/latest/developerguide/swf-dev-iam.html) in the Amazon SWF Developer Guide.

Method

GoString

func (s Decision) GoString() string

GoString returns the string representation

SetCancelTimerDecisionAttributes

func (s *Decision) SetCancelTimerDecisionAttributes(v *CancelTimerDecisionAttributes) *Decision

SetCancelTimerDecisionAttributes sets the CancelTimerDecisionAttributes field's value.

SetCancelWorkflowExecutionDecisionAttributes

func (s *Decision) SetCancelWorkflowExecutionDecisionAttributes(v *CancelWorkflowExecutionDecisionAttributes) *Decision

SetCancelWorkflowExecutionDecisionAttributes sets the CancelWorkflowExecutionDecisionAttributes field's value.

SetCompleteWorkflowExecutionDecisionAttributes

func (s *Decision) SetCompleteWorkflowExecutionDecisionAttributes(v *CompleteWorkflowExecutionDecisionAttributes) *Decision

SetCompleteWorkflowExecutionDecisionAttributes sets the CompleteWorkflowExecutionDecisionAttributes field's value.

SetContinueAsNewWorkflowExecutionDecisionAttributes

func (s *Decision) SetContinueAsNewWorkflowExecutionDecisionAttributes(v *ContinueAsNewWorkflowExecutionDecisionAttributes) *Decision

SetContinueAsNewWorkflowExecutionDecisionAttributes sets the ContinueAsNewWorkflowExecutionDecisionAttributes field's value.

SetDecisionType

func (s *Decision) SetDecisionType(v string) *Decision

SetDecisionType sets the DecisionType field's value.

SetFailWorkflowExecutionDecisionAttributes

func (s *Decision) SetFailWorkflowExecutionDecisionAttributes(v *FailWorkflowExecutionDecisionAttributes) *Decision

SetFailWorkflowExecutionDecisionAttributes sets the FailWorkflowExecutionDecisionAttributes field's value.

SetRecordMarkerDecisionAttributes

func (s *Decision) SetRecordMarkerDecisionAttributes(v *RecordMarkerDecisionAttributes) *Decision

SetRecordMarkerDecisionAttributes sets the RecordMarkerDecisionAttributes field's value.

SetRequestCancelActivityTaskDecisionAttributes

func (s *Decision) SetRequestCancelActivityTaskDecisionAttributes(v *RequestCancelActivityTaskDecisionAttributes) *Decision

SetRequestCancelActivityTaskDecisionAttributes sets the RequestCancelActivityTaskDecisionAttributes field's value.

SetRequestCancelExternalWorkflowExecutionDecisionAttributes

func (s *Decision) SetRequestCancelExternalWorkflowExecutionDecisionAttributes(v *RequestCancelExternalWorkflowExecutionDecisionAttributes) *Decision

SetRequestCancelExternalWorkflowExecutionDecisionAttributes sets the RequestCancelExternalWorkflowExecutionDecisionAttributes field's value.

SetScheduleActivityTaskDecisionAttributes

func (s *Decision) SetScheduleActivityTaskDecisionAttributes(v *ScheduleActivityTaskDecisionAttributes) *Decision

SetScheduleActivityTaskDecisionAttributes sets the ScheduleActivityTaskDecisionAttributes field's value.

SetScheduleLambdaFunctionDecisionAttributes

func (s *Decision) SetScheduleLambdaFunctionDecisionAttributes(v *ScheduleLambdaFunctionDecisionAttributes) *Decision

SetScheduleLambdaFunctionDecisionAttributes sets the ScheduleLambdaFunctionDecisionAttributes field's value.

SetSignalExternalWorkflowExecutionDecisionAttributes

func (s *Decision) SetSignalExternalWorkflowExecutionDecisionAttributes(v *SignalExternalWorkflowExecutionDecisionAttributes) *Decision

SetSignalExternalWorkflowExecutionDecisionAttributes sets the SignalExternalWorkflowExecutionDecisionAttributes field's value.

SetStartChildWorkflowExecutionDecisionAttributes

func (s *Decision) SetStartChildWorkflowExecutionDecisionAttributes(v *StartChildWorkflowExecutionDecisionAttributes) *Decision

SetStartChildWorkflowExecutionDecisionAttributes sets the StartChildWorkflowExecutionDecisionAttributes field's value.

SetStartTimerDecisionAttributes

func (s *Decision) SetStartTimerDecisionAttributes(v *StartTimerDecisionAttributes) *Decision

SetStartTimerDecisionAttributes sets the StartTimerDecisionAttributes field's value.

String

func (s Decision) String() string

String returns the string representation

Validate

func (s *Decision) Validate() error

Validate inspects the fields of the type to determine if they are valid.

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