Glue Workflow DSL

TOC

What is a DSL?

DSL stands for domain specific language, and is groovy's way of allowing language constructs to be written for a specific domain. Glue's workflows makes use of groovy's domain specific language definition. The workflow is then parsed by the Glue Rest server and its processes are executed.

Workflows are divided into Processes and their Tasks.

Using Clojure, Jython or JRuby?

This page explains how to write workflows using groovy. For Jython or JRuby pleasee see the Jython Example, JRuby Example or Closure Example

Example

To write a workflow we'd start with

tasks{
    //in this code block we write out processes
}

If we want to add a process "hello" that prints out "hello world" then we'd add

tasks{

    hello{

        tasks = { context ->
          //here we can place any valid groovy syntax.
          //the context variable acts as a Map or Dictionary that is shared
          //between processes

          println "hello world"
        }

    }

} 

To add another process "printName" that prints out "Dan" after hello executed we add

tasks{

    hello{

        tasks = { context ->
          //here we can place any valid groovy syntax.
          //the context variable acts as a Map or Dictionary that is shared
          //between processes

          println "hello world"
        }

    }

    printName{
       dependencies = "hello"

       tasks = { context ->
           println "Dan"
       }

    }

}