Task Anatomy

In the previous section, we built our first task and executed it. Let's take a look at how the simple conventions work for task runners.

Default conventions

The task run command will look for a default task name of task.cfc in the current working directory. The default target (or method) is called run. Therefore, when you run

task run

you will execute the run() method of ./task.cfc relative to your current working directory.

Take you to task

A task is just a CFC file. The task CFCs will extend the commandbox.system.BaseTask class, but it isn't necessary for your to extend it manually. CommandBox will add in virtual inheritance for you. The task CFCs can live wherever you want in your project (or outside of it!) and can have any name you wish. Since tasks are not scanned and registered by CommandBox, but rather created on-the-fly by convention, you don't have to worry about more than one task in different projects with the same name. That means, each of your projects can have a workbench/build.cfc task runner and they won't collide. When you run the task, the correct CFC will be located based on your current working directory. Therefore, tasks are not "global" like commands, but rather in the context of a given project or folder.

myTaskName.cfc

component {
  function run() {
    // Do awesome task stuff here
  }
}

To call the above task, we'd reference the path to where the CFC lives. It isn't necessary to include the .cfc part of the name, though we'll forgive you if you do!

task run path/to/myTaskName

Hit the target

You can have as many targets in your task as you wish, by simply declaring public methods. A task can have no parameters or as many as you like. Default argument values will be used as well. It's just a method execution, but from the command line!

build.cfc

component {

  function createZips() {
    print.line( 'Zips created!' );
  }

  function compileAssets(){
    print.line( 'Assets Compiled!' );
  }

  function minimizeJS(){
    print.line( 'JS Minimized!' );
  }

}

To run each of the targets above, you'd type this:

task run build createZips
task run build compileAssets
task run build minimzeJS

WireBox DI

All CFCs including tasks are created and wired via WireBox, so dependency injection and AOP are available to them. This can be handy for tasks to wrap services provided by models, or to access utilities and services inside CommandBox.

This task would inject CommandBox's ArtifactService to list out all the packages being stored.

component {

    property name='artifactService' inject='artifactService';

    function run(){
        var results = artifactService.listArtifacts();
        for( var package in results ) {
            print.boldCyanLine( package );
        }
    }

}

Tasks also have a variables.wirebox variable as well as their own getInstance() method which proxies to WireBox to get objects.

var results = getInstance( 'artifactService' ).listArtifacts();

Threading

The CommandBox CLI is implemented as a single long request in the underlying Lucee server. Due to this it is required to make a unique thread name every call to the task or else an error can occur. The following is an example you can use for running threads.

var threadName = createGUID();
cfthread( action="run" name=threadName) {
  //Thread body
}
cfthread( action="terminate" name=threadName);