Headline

A Groovy-based implementation that uses data flow variables

Motivation

Groovy is one of the most well-known JVM languages. One of its strength lies in the GPars , which offers many different approaches to parallel programming. An interesting concept is the concurrency based on data flow. The overall idea is the creation of a temporal order between processes, seeing the availability of certain values as constraints. This project demonstrates the usage of this data flow concurrency in Groovy using data flow variables.

Illustration

Queries like Feature:Total depends on different values (e.g. the Feature:Total of each department). Because these subqueries are independent from each other they can be executed in parallel.

In general, all subcomputations are outsourced in a new thread. Therefore, these computations are encapsulated into closures and transfered to the task method. If such a thread needs a value of a data flow variable, which is not bound (i.e. computed) yet, it is suspended until its awoken by the system. For compact programing GPars offers a container like bean, which properties are data flow variables. These variables are initialized lazily the first time they are accessed. An example for such a bean is totals.

 

// outsourcing total computation for each the department depts.each() { d ->

    task {
    // adding dept's total as dataflow variable to the bean
        totals.putAt d.name, d.total()
    }

}

Architecture

  • Company.groovy everything related to a company
  • Department.groovy everything related to a department
  • Employee.groovy everything related to an employee
  • Basic.groovy basic functionality tests with a sample company

Usage

You need to install the Eclipse plugin Groovy-Eclipse. Update Site: http://dist.springsource.org/release/GRECLIPSE/e3.7/

Then open Basic.groovy and start the JUnit test case you like. The implementation has been tested with:

  • Eclipse IDE (Version 3.7)
  • Groovy-Eclipse: Eclipse plugin (Version 2.5.1)
  • GPars: Parallel computing framework (Version 0.12)
  • JUnit: Unit testing (Version 4.8.2)

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    For you are available next options:

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