Amazon SWF stands for Simple Workflow Service. The Amazon SWF API allows developers to set specific business processes and follow through each step. The API allows for automation of processes, including determining which step is currently being executed, correcting when a step gets broken and analyzing outcomes.
The service separates its actions into five categories: activities, deciders, workflow executions, administration and visibility. Regardless of category, developers can poll an activity's task, mark an activity task as complete, mark an activity task as failed, mark an activity task as canceled or record a "heartbeat," so the service knows a task is still active.
There are numerous actions within each category, such as retrieving, setting and removing workflows.
The API uses JSON-RPC (remote procedure call) to execute commands. The system returns data as JSON, as well.
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The Amazon Web Services Haskell SDK by Brendan Hay allows developers to access all of the publicly available Amazon Web Services using Haskell code. Some of the code contained in this SDK is auto-generated and automatically kept up-to-date.