As already mentioned in the chapter → onCore Execution Model the execution model of onCore is based on a sequential flow-of-control-model.
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Triggers and Events must be used to initiate the execution of Units. Therefore a Unit where the Execute Trigger is not wired will not do anything. |
Unit Triggers
Triggers are represented by grey, green and red triangles. They cannot be wired to anything else than their own kind.
| Trigger Type | Trigger Representation | Trigger Description |
|---|---|---|
| Execute Trigger |
| This trigger gets fired by the execution flow and the Unit will be called to execute. |
| Success Trigger |
| Upon completion, this trigger will be automatically |
fired and the next Unit, which has its Execute Trigger wired to this Complete Trigger, will be executed next. |
| Fail Trigger |
| If something goes wrong while a Unit is being executed, the Fail Trigger will be fired instead of the Success Trigger. |
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Units may usually have several Complete Triggerstwo output Triggers (Success and Fail), which can be used to branch to individual flows. These triggers , when wired together, precisely define the execution flow of the Workflow. As a consequence to the strictly controlled execution flow, it is not possible that an Execute Trigger of a Unit gets wired to more than one trigger or port. |
Events
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to wire a Trigger to multiple other Triggers. If this is required please use the appropriate Units, such as Multi Trigger, Branch and Trigger Join. |
Event Units
| Event Units are used to trigger execution of an entire Workflow, or just a subset of a Workflow, or a Subworkflow. This is a very powerful concept, allowing Workflows to be triggered from any Workflow condition, but also – for example – from network events. The simplest example is the Trigger on Start event. |
| Event Type | Event Description |
|---|---|
| Trigger on Start |
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| Sends a Trigger when the Workflow is started. | |
| Trigger on Stop | Sends a Trigger when the Workflow is stopped. |
| UI Trigger | Sends a Trigger when the Trigger Button has been clicked. |
| Trigger Tick | Sends a trigger based on a time interval. If the old-style method |
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| of regular execution |
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| is required, |
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| this Unit can be used. |
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The UI Trigger Unit is very helpful to quickly test a Workflow or a certain part of a Workflow. |