# multi-layer-dss

A npm package that builds a multi-layered Decisión 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 it's "resolve" function, that also receives the Object.

## Installation

```sh
npm install multi-layer-dss --save
```
## Usage

### Commands
* Run EsLint test:
>>
```sh
npm run lint
```

* Run Mocha test (If builded):
>>
```sh
npm run test
```

* Build JS:
>>
```sh
npm run build
```

* Make use of 'debug.js':
>>
```sh
npm run debug
```
### Code example

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

#### Step by step
You can also créate the Flow, his Layers and their Rules separately, using the "add" methods of each class.

#### JSO

```javascript
    var x = new Foo();
    x.Bar();
```