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escalator

a javascript flow-control || step-wise execution system with between-step delays and in-execution step-manipulation and errorHandling

escalator

a flow-control class for javascript (nodeJS & browser)

in async environments - we do love them - there are times when you need to make sure foo is run after bar in all cases. for our VisualWeb framework we thus developed a object/class called escalator that allows us to write sequential code.

  • AUTHOR: Toni Wagner @itsatony
  • escalator offers DELAYS between steps. These are handy to make your app more response during cpu/load intensive code sequences. For example timeouts are a good idea to update upload/downloaf/progress bars
  • escalator offers setting of code-SCOPE PER STEP, thus enabling you to control the memory environment your steps are run in.
  • escalator offers a CONSTANT NAMESPACE, actually its own namespace, which is made available (passed as an additional call parameter) to every step. Thus, exchange of data between steps is super-easy and straightforward.
  • escalator objects can PERSIST with fully running and debugging info if you want that.
  • escalator offers a debug/logging mode that will record the time each step takes. very handy for performance optimization and error tracing
  • escalator wraps each step-call into a try-catch and allows you to define the errorhandler.
  • escalator steps can control the flow of efficiently, even stop the complete escalator with a message.
  • dependencies were removed ... this is totally independent now .
  • it should integrate into NodeJS on the server-side or any browser-side with javascript enabled.
  • none yet ;(
    • v0.2.8 added onError checking and upon catchError onError will be called. if not there the escalator finishes.
  • - v0.2.2	fixes to default add values		18.12.2013	
    
  • - v0.2.0	initial public release		15.11.2012	
    	- bug fixes
    	  - better error handling of steps
      	- optional try-catching of steps (allows for js engines to run optimizations if turned off)
    
  • v0.1.0 initial public release 08.05.2012
    • removed dependencies
    • enabled using the same file for client- and nodeJS server-side implementation
  • 1 - three steps, different configs
  var someVar = 'hello';
  var firstStep = {
id: 'myFirstStep',
priority: 10,
executorfunction(nextthisEscalator) {
someVar = 'hello too'
next();
}
};
var secondStep = {
id: 'mySecondStep',
priority: 20,
delay: 10,
parameters: [ someVar ],
scope: this,
executorfunction(somethingWePassedInnextthisEscalator) {
console.log(somethingWePassedIn);
thisEscalator.anotherVariable = 42;
next();
}
};
var lastStep = {
priority: 22,
executorfunction(nextthisEscalator) {
console.log(thisEscalator.anotherVariable);
next();
}
};
var myDemoEscalator = new escalator(
'demoEscalator',
[ firstStep, secondStep, lastStep ]
).start();