SWF
- Expands to Simple Workflow Service
- AWS service to harmonize work across distributed software application
- distributed software applications are group of tasks, like
- media processing
- business process workflow
- analytics
- Tasks in SWF is processing steps of software application and can include
- executable code
- web service calls
- human actions
- scripts
- tasks coordination implies
- managing execution dependencies
- scheduling of tasks
- maintain concurrency as per logical flow of software
- SWF Flow Framework asynchronously develops application
- tasks are
- steps in applications
- processed by workers
- workers
- process task and returns results
- are built in different programming languages
- re-use existing workers
- Decider
- worker coordination by decider
- takes decision tasks during workflow transition in execution
- transition can be task completion or time out
- decision tasks has input, output, state of previously initiated activity tasks to decide next step
- AWS maintains history of all execution for decider.
- History starts with task execution start till end and has input data, present state, etc
- can deploy workers/deciders in AWS or on-premise
- Access SWF by
- SDK for Java/Ruby/.NET/PHP
- Flow Framework for Java
- SWF web service APIs
- AWS Management Console
- SWF Registration
- needed for all workflows and activities.
- it provides unique type-ids for each activity and workflow type.
- register programmatically/by SWF Management Console.
- SWF domains
- logical containers defined to organize application resources
- cannot be nested
- has user-given name
- application resource for a domain include
- workflow type
- activity type
- execution
- it is specified during registration
