common Actions

gistfile1.js

var Emitter = require('events').EventEmitter;
var Actions = {
  create: function(actionName){
		var sequence = [];
		sequence.push([function(result){
      this.emit(result);
    }]);
    Actions[actionName] = function(params){
      params._emitted = false;
      params.emit = function(result){
        if(this._emitted) return;
        Actions.emit(actionName, result);
      }
      params.actionName = actionName;
      
      var res = sequence.reduce(function(dostuff, func){
        func = [].slice.call(func).map(function(funcArg){
          return funcArg.bind(params);
        });
        return dostuff.then.apply(dostuff, func);
      }, Promise.resolve());
		};

		var self = {
			then: function(){
        sequence.splice(sequence.length-1,0,arguments);
				return self;
			}
		};
		return self;
	},
  doAction: function(actionName){
    var arg = [].slice.call(arguments);
		Actions[arg.shift()].apply(this, arg);
	}
};
Actions.__proto__ = new Emitter();


//USAGE
Actions.create('test').then(function(){
	console.log(1, this);
	return "result";
}).then(function(result){
	console.log(2, this);
	return true;
}).then(function(){
	console.log(3, this);
	return "OK";
});
Actions.on('test', function(result){
	console.log(result);
})
Actions.test({a:1, b:2});

/*
* 1 Object {a: 1, b: 2}
* 2 Object {a: 1, b: 2}
* 3 Object {a: 1, b: 2}
* OK
*/
Actions.doAction('test', {a:1, b:2});
/*
* 1 Object {a: 1, b: 2}
* 2 Object {a: 1, b: 2}
* 3 Object {a: 1, b: 2}
* OK
*/