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/AWS1/CL_SWFDECISION

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 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 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:

CONSTRUCTOR

IMPORTING

Required arguments:

IV_DECISIONTYPE TYPE /AWS1/SWFDECISIONTYPE /AWS1/SWFDECISIONTYPE

Specifies the type of the decision.

Optional arguments:

IO_SCHDACTIVITYTASKDCSNATTRS TYPE REF TO /AWS1/CL_SWFSCHACTIVITYTSKDC00 /AWS1/CL_SWFSCHACTIVITYTSKDC00

Provides the details of the ScheduleActivityTask decision. It isn't set for other decision types.

IO_REQCANCACTIVITYTSKDCSNA00 TYPE REF TO /AWS1/CL_SWFREQCANCACTIVITYT01 /AWS1/CL_SWFREQCANCACTIVITYT01

Provides the details of the RequestCancelActivityTask decision. It isn't set for other decision types.

IO_COMPLWORKFLOWEXECDCSNAT00 TYPE REF TO /AWS1/CL_SWFCMPWORKFLOWEXDCS00 /AWS1/CL_SWFCMPWORKFLOWEXDCS00

Provides the details of the CompleteWorkflowExecution decision. It isn't set for other decision types.

IO_FAILWORKFLOWEXECDCSNATTRS TYPE REF TO /AWS1/CL_SWFFAILWORKFLOWEXDC00 /AWS1/CL_SWFFAILWORKFLOWEXDC00

Provides the details of the FailWorkflowExecution decision. It isn't set for other decision types.

IO_CANCWORKFLOWEXECDCSNATTRS TYPE REF TO /AWS1/CL_SWFCANCWORKFLOWEXDC00 /AWS1/CL_SWFCANCWORKFLOWEXDC00

Provides the details of the CancelWorkflowExecution decision. It isn't set for other decision types.

IO_CONTINUEASNEWWORKFLOWEX01 TYPE REF TO /AWS1/CL_SWFCONTINUEASNEWWOR01 /AWS1/CL_SWFCONTINUEASNEWWOR01

Provides the details of the ContinueAsNewWorkflowExecution decision. It isn't set for other decision types.

IO_RECORDMARKERDECISIONATTRS TYPE REF TO /AWS1/CL_SWFRECMARKERDCSNATTRS /AWS1/CL_SWFRECMARKERDCSNATTRS

Provides the details of the RecordMarker decision. It isn't set for other decision types.

IO_STARTTIMERDECISIONATTRS TYPE REF TO /AWS1/CL_SWFSTRTTIMERDCSNATTRS /AWS1/CL_SWFSTRTTIMERDCSNATTRS

Provides the details of the StartTimer decision. It isn't set for other decision types.

IO_CANCELTIMERDECISIONATTRS TYPE REF TO /AWS1/CL_SWFCANCTIMERDCSNATTRS /AWS1/CL_SWFCANCTIMERDCSNATTRS

Provides the details of the CancelTimer decision. It isn't set for other decision types.

IO_SIGNALEXTERNALWORKFLOWE02 TYPE REF TO /AWS1/CL_SWFSIGNALEXTERNALWO02 /AWS1/CL_SWFSIGNALEXTERNALWO02

Provides the details of the SignalExternalWorkflowExecution decision. It isn't set for other decision types.

IO_REQCANCEXTERNALWORKFLOW02 TYPE REF TO /AWS1/CL_SWFREQCANCEXTERNALW02 /AWS1/CL_SWFREQCANCEXTERNALW02

Provides the details of the RequestCancelExternalWorkflowExecution decision. It isn't set for other decision types.

IO_STRTCHILDWORKFLOWEXDCSN00 TYPE REF TO /AWS1/CL_SWFSTRTCHILDWORKFLO02 /AWS1/CL_SWFSTRTCHILDWORKFLO02

Provides the details of the StartChildWorkflowExecution decision. It isn't set for other decision types.

IO_SCHDLAMBDAFUNCDCSNATTRS TYPE REF TO /AWS1/CL_SWFSCHLAMBDAFUNCDCS00 /AWS1/CL_SWFSCHLAMBDAFUNCDCS00

Provides the details of the ScheduleLambdaFunction decision. It isn't set for other decision types.

Queryable Attributes

decisionType

Specifies the type of the decision.

Accessible with the following methods

Method Description
GET_DECISIONTYPE() Getter for DECISIONTYPE, with configurable default
ASK_DECISIONTYPE() Getter for DECISIONTYPE w/ exceptions if field has no value
HAS_DECISIONTYPE() Determine if DECISIONTYPE has a value

scheduleActivityTaskDecisionAttributes

Provides the details of the ScheduleActivityTask decision. It isn't set for other decision types.

Accessible with the following methods

Method Description
GET_SCHDACTIVITYTSKDCSNATTRS() Getter for SCHDACTIVITYTASKDCSNATTRS

requestCancelActivityTaskDecisionAttributes

Provides the details of the RequestCancelActivityTask decision. It isn't set for other decision types.

Accessible with the following methods

Method Description
GET_REQCANCACTIVITYTSKDCSN00() Getter for REQCANCACTIVITYTASKDCSNATTRS

completeWorkflowExecutionDecisionAttributes

Provides the details of the CompleteWorkflowExecution decision. It isn't set for other decision types.

Accessible with the following methods

Method Description
GET_COMPLWORKFLOWEXECDCSNA00() Getter for COMPLWORKFLOWEXECDCSNATTRS

failWorkflowExecutionDecisionAttributes

Provides the details of the FailWorkflowExecution decision. It isn't set for other decision types.

Accessible with the following methods

Method Description
GET_FAILWORKFLOWEXECDCSNAT00() Getter for FAILWORKFLOWEXECDCSNATTRS

cancelWorkflowExecutionDecisionAttributes

Provides the details of the CancelWorkflowExecution decision. It isn't set for other decision types.

Accessible with the following methods

Method Description
GET_CANCWORKFLOWEXECDCSNAT00() Getter for CANCELWORKFLOWEXECDCSNATTRS

continueAsNewWorkflowExecutionDecisionAttributes

Provides the details of the ContinueAsNewWorkflowExecution decision. It isn't set for other decision types.

Accessible with the following methods

Method Description
GET_CONTINUEASNEWWORKFLOWE01() Getter for CONTINUEASNEWWORKFLOWEXDCS00

recordMarkerDecisionAttributes

Provides the details of the RecordMarker decision. It isn't set for other decision types.

Accessible with the following methods

Method Description
GET_RECORDMARKERDCSNATTRS() Getter for RECORDMARKERDECISIONATTRS

startTimerDecisionAttributes

Provides the details of the StartTimer decision. It isn't set for other decision types.

Accessible with the following methods

Method Description
GET_STARTTIMERDECISIONATTRS() Getter for STARTTIMERDECISIONATTRIBUTES

cancelTimerDecisionAttributes

Provides the details of the CancelTimer decision. It isn't set for other decision types.

Accessible with the following methods

Method Description
GET_CANCELTIMERDECISIONATTRS() Getter for CANCELTIMERDECISIONATTRS

signalExternalWorkflowExecutionDecisionAttributes

Provides the details of the SignalExternalWorkflowExecution decision. It isn't set for other decision types.

Accessible with the following methods

Method Description
GET_SIGNALEXTERNALWORKFLOW02() Getter for SIGNALEXTERNALWORKFLOWEXDC00

requestCancelExternalWorkflowExecutionDecisionAttributes

Provides the details of the RequestCancelExternalWorkflowExecution decision. It isn't set for other decision types.

Accessible with the following methods

Method Description
GET_REQCANCEXTERNALWORKFLO02() Getter for REQCANCEXTERNALWORKFLOWEXD00

startChildWorkflowExecutionDecisionAttributes

Provides the details of the StartChildWorkflowExecution decision. It isn't set for other decision types.

Accessible with the following methods

Method Description
GET_STRTCHILDWORKFLOWEXDCS00() Getter for STRTCHILDWORKFLOWEXDCSNATTRS

scheduleLambdaFunctionDecisionAttributes

Provides the details of the ScheduleLambdaFunction decision. It isn't set for other decision types.

Accessible with the following methods

Method Description
GET_SCHDLAMBDAFUNCDCSNATTRS() Getter for SCHDLAMBDAFUNCTIONDCSNATTRS

Public Local Types In This Class

Internal table types, representing arrays and maps of this class, are defined as local types:

TT_DECISIONLIST

TYPES TT_DECISIONLIST TYPE STANDARD TABLE OF REF TO /AWS1/CL_SWFDECISION WITH DEFAULT KEY
.