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README-decision.md

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Decision task API

Overview :

The decider is executed for each new decision task.

We have two types of Helper methods :

  • helpers to inspect the event history (to find the state we are in)
  • helpers to make decisions : schedule activities / child workflows / and timer

Decision helpers integrate flow control using the history helpers.

Decisions

Important : does NOT call the activity now, it just adds it to the decisions array !

The decisions will then be sent in the decisionTaskResponse ( automagically done by aws-swf if noresponse has been sent yet.)

1. scheduling an activity :

schedule({ name: obligatoire activity: obligatoire, input: { optional } })

Stopping the workflow

Stop()

Starting a child workflow

Todo

Question : can it be recursive ? Of course !

Starting a timer

Todo

Fail execution

Todo

Advanced: A second argument can be passed to the decision helpers :

    An object which contains raw SWF attributes

Flow control

ex step1 completed AND step2 failed

{ completed: 'step1', failed: 'step2' }

step1 AND step2 completed :

{ completed: ['step1', step2] }

step1 or step2 completed

TODO

fn method for more complex conditions

{ fn: function () { return completed('step1', 'step2') || completed('step3'); } }

Results-based conditions

You can also use results from a previous activity or the workflow input :

{ fn: function () { return completed('step1') && results('step1').questionA == 'yes'; } }

Passing parameters

Input can be a function