How to write a workflow with modifiers?
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Modifiers
Construct | Modifier | Domain | Description | Default |
---|---|---|---|---|
Workflow |
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Limit | -1..n | The maximum number of workflow instances of the same model waiting at any given time (they are pre-created instances existing in the buffer) | 10 | |
Live | -1..n | The maximum number of workflow instances of the same model allowed to run (in parallel) at the same time. (For example, a workflow receives inputs of X value and Y value and calculates X+Y=Z. When the first X and Y values are received, a workflow instance starts the process of calculation. While the calculation is taking 1 second to complete, a new set of X and Y values are received before the current instance is completed. Therefore a new workflow instance will start calculating X+Y from the new values. These two instances are running in parallel | 10 | |
Timeout | -1..n | The period of time of inactivity after which a workflow instance is considered dead and removed from the buffer. Both XSD time period format and plain number of milliseconds are allowed. Timeout = "-1" means the workflow will never time out. | PT1M | |
Task |
| |||
While | true, false | Logical expression for repeatable tasks (only true/false is currently supported) (if false use variable not streams) | false | |
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Invoke | ||||
SkipIf (skip-if) | true, false | A logical expression to skip the invoke execution (mutually exclusive with OnlyIf) - output will be null | ||
OnlyIf (only-if) | true, false | A logical expression to execute invoke conditionally (mutually exclusive with SkipIf) | ||
Delay | Duration | Synonym for DelayBefore (mutually exclusive with DelayUntil, Timeout) | ||
DelayBefore | Duration | Invoke execution delay interval (delay before invoke starts executing) - Mutually exclusive with Timeout and DelayUntil | ||
DelayAfter | Duration | Time to wait after invoke completed for the next invoke in the same task to start | ||
DelayUntil | DateTime | Absolute invoke execution time (Mutually exclusive with DelayBefore and Timeout) | ||
Get | URI | |||
Post | URI | |||
Put | URI | |||
Delete | URI | |||
WaitFor | A logical expression of possibly multiple outputs/events | |||
Timeout | Duration | Invoke type dependent hint. Different invoke types may interpret it differently (Mutually exclusive with Delay and DelayUntil) - only relevant if handler understands it, maybe not be in use currently (synonym of delay), use delay instead | ||
Unless | Name of the Output from another task | Delay termination output/event. Usually used with timeout/delay |