This is a simple tool to implement a data flow. This tool is designed in tasks and each task can has an input and an output. The main task (FlowTask) can create various tasks which are implemented in the core or in some plugins. The FlowTask takes an input and pass it through all tasks. The subtasks can handle the passed data, e.g. write it to the storage or can create new data, e.g. read files from storage.
The example below shows a simple script which filters odd numbers.
createFlow {
input { ( 1 .. 7 ) }
forEach {
mapValue()
code {
println "Receiving $input"
if (input % 2 == 1) {
println "Passing $input to output"
output = input
}
}
}
}
The InputTask (input) ignores the passed input and create a new input. The ForEachTask (forEach) expects a collection or a map and executes each element with an inner FlowTask.
Execution:
$ ./FlowDSL/bin/FlowDSL flow.dsl
Receiving 1
Passing 1 to output
Receiving 2
Receiving 3
Passing 3 to output
Receiving 4
Receiving 5
Passing 5 to output
Receiving 6
Receiving 7
Passing 7 to output
[1, 3, 5, 7]
Output from the code task:
Receiving 1
Passing 1 to output
Receiving 2
Receiving 3
Passing 3 to output
Receiving 4
Receiving 5
Passing 5 to output
Receiving 6
Receiving 7
Passing 7 to output
Final program output:
[1, 3, 5, 7]
This DSL will be interesting because of the plugin feature. So it's possible to add tasks to the DSL which can access a webservice or a database. This tool is very helpful to create a simple script, loading and updating data from different sources in a simple DSL.
MIT License
Copyright (c) 2020 andycandy-de
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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