multi-layer-dss

A npm package that builds a multi-layered Decision Support System (DSS) for Node.js.

This package makes use of three core clases: Flow, Layer, Rule; written in TypeScript and builded to JS.

• A Flow is the complete system. It contains Layers and a "resolve" function (Coded by the user) receiving all Layers results. Flow.execute receives the Object to pass the Flow.
• A Layer contains related Rules and a "resolve" function (Coded by the user) receiving all Rules of this Layer and the Object. "resolve" should call the "resolve" function of each Rule.
• A Rule contains any number of "conditions" as functions that receive the Object and should return a boolean, a "content" of any type, a number "weigth" useful in its "resolve" function, that also receives the Object.

Installation

npm install multi-layer-dss --save

Usage

Commands

• Run EsLint test:

npm run lint

• Run Mocha test (If builded):

npm run test

• Build JS:

npm run build

• Make use of 'debugFlow.js':

npm run debugFlow

• Make use of 'debugStep.js':

npm run debugStep

Code example

var mldss = require('multi-layer-dss');
var flow = mldss.Flow;
var layer = mldss.Layer;
var rule = mldss.Rule;

Step by step

See debugStep.js

'use strict';
var index = require('multi-layer-dss');
var flow = index.Flow;
var layer = index.Layer;
var rule = index.Rule;
 
let rules = [];
rules.push(new rule(1, 'General Grievous', [(o) => { return o.value === 2; }]));
rules.push(new rule(1, 'General Kenobi', [(o) => { return o.value === 1; }]));
 
let layers = [];
layers.push(new layer((rul, o) => {
    let ret = 'Hello there';
    console.log(ret);
 
    for (let i = 0; i < rul.length; i++){
        if (rul[i].resolve(o))
            ret = rul[i].getContent();
    }
 
    return ret;
}, rules));
 
let newRule = new rule(1, 'Master Skywalker', [(o) => { return o.value === 3; }]);
layers[0].addRule(newRule);
 
let resolveFunc = (results) => {
    return results[0];
};
let actualFlow = new flow(resolveFunc);
for (let i = 0; i < layers.length; i++){
    actualFlow.addLayer(layers[i]);
}
 
let obj = {
    value: 1
}
 
actualFlow.execute(obj)
.then(val => {
    console.log(val);
})
.catch(err => {
    console.log(err);
});

JSO

See debugFlow.js

'use strict';
var index = require('multi-layer-dss');
var flow = index.Flow;
 
let layers = [{
        resolve: (rul, o) => {
            let ret = 'Hello there';
            console.log(ret);
 
            for (let i = 0; i < rul.length; i++){
                if (rul[i].resolve(o))
                    ret = rul[i].getContent();
            }
 
            return ret;
        },
        rules: [
            {
                weigth: 1,
                content: 'General Kenobi',
                conditions: [
                    (o) => {
                        return o.value === 1;
                    }
                ]
            },
            {
                weigth: 1,
                content: 'General Grievous',
                conditions: [
                    (o) => {
                        return o.value === 2;
                    }
                ]
            }
        ]
    }
];
let resolveFunc = (results) => {
    return results[0];
};
 
let actualFlow = new flow(resolveFunc, layers);
let obj = {
    value: 1
}
 
actualFlow.execute(obj)
.then(val => {
    console.log(val);
})
.catch(err => {
    console.log(err);
});