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Conditional Workflow
This example is dedicated to conditional workflow. A quick demonstration of how you can setup a conditional workflow in your system.
In order to execute the following example from the hellhound_examples repository. Just issue the following command in the repository root directory.
Ok let’s jump into the code.
link:simple_system3.clj[role=include]| 1 | Connects the input of the component to its output with no transformation. |
| 2 | Consumes values from the input and print them out. |
| 3 | Consumes values from the input and print them out. |
| 4 | Connects the output of :simple-system/component-1 to :simple-system/component-2,
But only delivers odd (hence the odd? predicate function) numbers to downstream
component. |
| 5 | Connects the output of :simple-system/component-1 to :simple-system/component-3,
But only delivers even (hence the even? predicate function) numbers to downstream
component. |
|
In the system of this example, the workflow is like: odd? | ---> component-2
DATA ---> component-1 |
even? | ---> component-3
|
When we execute the above code the output would be something like:
The output of the above namespace
[17-10-29 22:39:48] [DEBUG] <hellhound.component:115> - Starting component ':simple-system/component-2'...
[17-10-29 22:39:48] [DEBUG] <hellhound.component:115> - Starting component ':simple-system/component-1'...
[17-10-29 22:39:48] [DEBUG] <hellhound.component:115> - Starting component ':simple-system/component-3'...
[17-10-29 22:39:48] [INFO] <hellhound.system.core:142> - System started successfully.
[17-10-29 22:39:48] [DEBUG] <hellhound.system.workflow:107> - Setting up workflow...
[17-10-29 22:39:48] [INFO] <hellhound.system.workflow:110> - Workflow setup done.
Odd: 1
Even: 2
Odd: 3
Even: 4
Odd: 5
Even: 6
Done.The above output is clear enough. Component 2 got only odd values and component 3 got the even values. The predicate functions of a workflow catalog can be any function. But you need to bear in mind that HellHound is going to run these predicates for each value so for the sake of performance we need to keep the fast and pure.
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