ClassJS

Business and Data Access layers for browsers or nodejs

Documentation

Install

• NodeJS
  • Standalone: $ npm install atma-class var Class = require('atma-class')
  • AtmaPackage
• Browser
  • <script src='//cdn.jsdelivr.net/classjs/1.0.66/class.min.js'></script>

---

• Attributes Overview
• Serialization
• Collections
• Persistence
  • RESTful
  • Local Storage
  • MongoDB
  • MySQL in progress
• Repository
• Static Functions
• Validation
• Classes
  • Deferred
  • EventEmitter

Attributes

Class definition object is a simple prototype object, but with Attributes it is possible to add or change some functionality of the resulted class, like inheritance, overrides, persistance, validation and some more.

Class({
	/*
	 * instanceof also works on deep inheritances
	\*/
	Base: < Function > BaseConstructor,
	/* 
	 * Same as base, but instanceof wont work, 
	 * as instanceof allows linear inheritance only
	\*/
	Extends: < Function | Object | Array > Mixins
	/*
	 * constructor of a class - if has inheritance, 
	 * also all constructors will be called
	\*/
	Construct: < Function > function(){}
	/*
	 * Static functions of a created Class
	 * User.key()
	\*/
	Static: < Object > { key: function(){} }
	/*
	 * RESTfull/LocalStorage/MongoDB serialization/deserialization
	\*/
	Store: <| Class.Remote('/user/:id')
            | Class.LocalStore('user')
            | Class.MongoStore.Single('users')
            | Class.MongoStore.Collection('users') /* use in Class.Collection */ |>
    /*
	 * Override any Base or Extended Function
	 * Using this object, there will be access to overriden function
     * via this.super();
    \*/
	Override: < Object > {
		some: function(){
			
			// default arguments
			this.super(arguments);
			
			// overriden arguments
			this.super(arg1, arg2);
		}
	},
	Self: {
		/*
		 * Functions, that are always bound to the instance of the class
		 * e.g. setTimeout(this.foo, 1000);
        \*/
		foo: function(){}
	},
    Validate: {
		/*
		 * @see `validation` section
		 * e.g.
		 * var foo = new Foo();
		 * foo.user = null;
		 * var error = Class.validate(foo);
		\*/
        user: function(val){
            if (val == null)
                return 'Username is not defined';
        }
    },
	/*
	 * Private properties with the underscore contract.
	 * Such properties wont be serialized
	\*/
	'_property': null,
	
	/*
	 * Other class functions/properties
	 * This Object is then transformed into prototype object of
	 * a class.
	\*/
	...
});

Serialization

A Class instance can be serialized to or deserialiazed from a string or simple JSON object. For this to happen, the instance schould be inherited from a Serialization class.

var Foo = Class({
	Base: Class.Serializable,
	...
});
var foo = new Foo({baz: 'Baz'});
foo.baz === 'Baz';

There could be also some meta specified

var Foo = Class({
	Base: Class.Serializable({
		// constructor deserialization, e.g.:
		'date': Date,
		
		// use entity from ClassJS IoC Repository
		'article': 'Article',
		
		// same
		'user': {
			deserialize: User
		},
		
		// skip property
		'none': {
			serialize: null
		},
		
		// rename property when de-/serializing
		'myKey': {
			key: 'yourKey'
		}
	})
});

var jsonStr = '{"date":"2014-03-27T23:33:45.594Z","user":{"name":"baz"},"yourKey":5}';
var foo = new Foo(jsonStr);

foo.date instanceof Date //> true
foo.user instanceof User //> true
foo.myKey === 5 //> true

Collections

Creates Array-like Object with all class features

var Users = Class.Collection(User, {
	// ... Class Definition Object, e.g. Remote
	Store: Class.Remote('/api/users?location={?country}')
});

var list = Users
	.fetch({country: 'DE'});
	.done(function(obj){
	
		list === obj 
		list.length
		list[0]
		// user instance
		list.first({age: '>20', genre: 'm'}); 
		// collection instance
		list.where({age: '>20'});
		list.where(function(x){ return x.age > 20 });
		// mutator
		list.remove({age: '<5'});
		// storage
		list.save();
		// mutator + storage
		list.del({age: '<5'});
	});

Store

Storage Interface is same for all types, so you can easily switch between local storage, Ajax or MongoDB.

Remote

async - extends Class.Deferred

var User = Class({
	Base: Class.Serializable,
	Store: Class.Remote('/user/:id')
});

// resolve user (GET)
var user = User
	.fetch({id: 5})
    .done(onSuccess)
	.fail(onFail)
	.always(onComplete)
	.then(onSuccess, onFail);

// update (PUT) or Save (POST) - (look for existance of id/_id properties);
user.name = 'X';
user
    .save()
	.done(onSuccess)
	.fail(onFail)
	.always(onComplete);

// Remove (DELETE)
user
    .del()
	.done(onSuccess)
	.fail(onFail)
	.always(onComplete)

// patch object (PATCH) - MongoDB update query syntax is used
user
	.patch({
		$inc: { 'visits': 1 },
		$set: { 'current.date' : new Date }
	});
	
// Static service comunication
var user = new User({
	username: 'baz'
	age: 40
});
Class
	.Remote
	.send('/user/publish', 'put', user)
	.done(function(responseJSON){
		
	});

More route samples can be found from tests Route Tests

LocalStore

sync, as localStorage is synchronous - but also inherits from Class.Deferred

var Settings = Class({
	Base: Class.Serializable,
	Store: Class.LocalStore('app/settings'),
	points: 5
});
var setts = new Settings;
// get
setts.fetch();
// save or update
setts.points = 10;
setts.save();
// remove
setts.del();
// patch
setts.patch({
	$inc: { points: 1 }
});

MongoDB

// settings:
Class.MongoStore.settings({
	db: 'myDBName',
	ip: '127.0.0.1' // <- default
	port: 27017 // <- default
});
//

var User = Class({
	Base: Class.Serializable,
	Store: Class.MongoStore.Single('users'),
	username: ''
});
var Users = Class.Collection(User, {
	Store: Class.MongoStore.Collection('users')
});

var user = User
	.fetch({ username: 'bar' })
//  .fetch({ age: '>10' })
//  .fetch({ age: { $gt: 10 }})
	.done(function(user_){
		user === user_
	})
	.fail(function(error){})

// Complex queries with options. (Use $query from MongoDB API)
Users
	.fetch({
		$query:{
			name: 'Smith'
			age: {
				$gte: 40
			}
		},
		$orderby:{
			surname: -1
		}
	}, {
		fields: { name: 1 },
		skip: 0,
		limit: 10
	})
	.done(function(users){});

user.username = 'foo'
// save or update if `_id` is present.
user
	.save()
	.done(callback)
	.fail(callback)
	.always(callback)
	;
// delete
user
	.del()
	.done(callback)
	.fail(callback)
	.always(callback);
// patch
user
	.patch({
		$inc: { age: 1 }
	});

// Any MongoDB queries:

// 1) Get MongoDB `db` object
Class
	.MongoStore
	.resolveDb()
	.done(function(db){
		// do smth with the database
	})
	.fail(onError);

// 2) Get MongoDB `collection` object
User
	.resolveCollection()
	.done(function(collection){
		// do smth with the collection object
	})
	.fail(onError)
	;

All work with the database is encapsulated, so you do not need even to connect to the database, just apply settings and with the first query the connection will be established.

Indexes

var User = Class({
	Base: Class.Serializable,
	Store: Class.MongoStore.Single({
		collection: 'users',
		indexes: [ 
			// simple index
			{ qux: 1}
			// compound index
			{
				bar: 1,
				baz: 1
			},
			// with options
			[{ username: 1 }, { unique: true }]
		]
	})
});
// ensure indexes
Class
	.MongoStore
	.ensureIndexes(User) //=> Deferred
	
// as all indexes being tracked, you can apply all indexes at once
Class
	.MongoStore
	.ensureIndexesAll() //=> Deferred
	

Advanced connections and settings:

Class
	.MongoStore
	.settings({
		connection: 'mongodb://localhost:30000,localhost:30001,localhost:30002/myDatabase',
		
		// redefine options, defaults are:
		params: {
			auto_reconnect: true,
			native_parser: true,
			w: 1
		}
	})

Profiler

Enable profiler to catch all slow, unindexed queries and updates.

Class
	.MongoStore
	.profiler
	.toggle(true, {
		slowLimit: 200,
		onDetect: function(QueryInfo),
		
		// add additional slow query detector,
		// return `true` if this should be added to collection
		detector: function(MongoDB_Plan):Boolean
	});
	
QueryInfo = {
	coll: 'String `current name`',
	query: 'Object `query wich was performed`',
	params: {
		reason: '`slow|unindexed`'
	},
	plan: MongoDB_Plan
};

// get all slow queries
Class
	.MongoStore
	.profiler
	.getData(): Array<QueryInfo>

Repository

Namespaces When declaring a Class, it can be stored in the repository object for simpler access.

MaskJS.Node profits of this feature to automatically serialize (server-side) and deserialize (browser) class instances.

var User = Class('User', ClassDefinition);

User === Class('User') === Class.Model.User;

// redefine the repository object
Class.cfg('ModelHost', window.Model = {});

User === Class('User') === Model.User;

Static Functions

• Class.validate(object [, ?validationModel, ?isStrict]) #

  • validationModel - (@see Validation) - is not required, if instance/object has Validate attribute.
  • isStrict - Boolean - return error if object contains property, which is not defined in validationModel

  returns error object if the instance is invalid or nothing (void 0) if is ok.

• Class.properties(Ctor | instance) #

  return hash of all properties with types if known.

• Class.keys(instance) #

  return array of properties (without methods and private props)

• Class.stringify(instance) #

  Serializes the instance. If class has name, the name is included, for later deserialization and initialization

• Class.parse(string) #

  Deserializes instance. e.g - serialize models on NodeJS, pass them to the front-end and restore the models there.

   var User = Class('User', {
   	Base: Class.Serializable,
   	name: '',
   	log: function(){ console.log(this.name) };
   });
   var user = new User({name: 'baz'});
   user.log(); //> 'baz'
   
   var str = Class.stringify(user) //> {"name":"baz","__$class__":"User"}
   ...
   
   var user = Class.parse(str);
   user.log() //> 'baz'

Validation

Validation Model

{
	// required, not empty string
	foo: 'string',
	// required, of type number
	foo: 'number',
	// required, validate with regexp
	age: /^\d+$/,
	// required, custom check function (return 'nothing' if ok)
	number: function(value){
		if (value % 2 !== 0)
			return 'Only even numbers';
	}
	// optional. Same value types as by 'required'
	'?baz': 'number',
	// unexpect. Same value types as by 'required'
	'-quz': null,
	// validate subobject
	jokers: {
		left: 'number',
		right: 'number'
	},
	// validate arrays
	collection: [ {_id: 'string', username: 'string'} ]
}

• Class Validation

   var Foo = Class({
   	Validate: ValidationModel
   });
   var foo = new Foo;
   var error = Class.validate(foo);

• Simple object validation

   var user = { username: 'foo' }
   var error = Class.validate(user, ValidationModel);

Classes

There are some classes you can start to use.

Deferred

Promise/Defer implementation

Usage example

// 1) Create deferrable class
var X = Class({
	Base: Class.Deferred,
	// ... class properties
});
var dfr = new X;

// 2) Create simple deferrable object
var dfr = new Class.Deferred;

// 3) Create simple deferrable object with factory function
var dfr = Class.Deferred.run(function(dfr){
	// perform async operations
});

// 3) Create deferrable delegate
var fn = Class.Deferred.create(function(dfr, foo){
	// ...
	dfr.resolve(foo);
}));

var dfr = fn('foo');

// 4) Memoize deferrable delegate (with same arguments function is called only once)
var fn = Class.Deferred.memoize(function(dfr, foo){
	// ...
	dfr.resolve(foo);
}));

var dfr1 = fn('foo');
var dfr2 = fn('foo');
dfr1 === dfr2; //> true


Deferred __proto__ {
	// callbacks are called once
	done  : function(callback):Self,
	fail  : function(callback):Self,
	always: function(callback):Self,
	
	resolve: function(...args):Self,
	reject : function(...args):Self
	
	// reset deferred object and move to unresolved state
	defer  : function():Self
	
	pipe   : Function
		// pipe Self states to this deferred instance
		= function(Deferred):Self
		
		// Returns new Deferred which depends on Filter functions
		// @see Filter meta
		= function(doneFilter, failFilter): new Deferred
	
	// create the delegate function, which will resolve or reject the deferred object when called,
	// first argument
	pipeCallback: function(): function
		
	// alias to .pipe(function, function)
	then   : function(doneFilter, dailFilter):new Deferred,
	
	// check state
	isResolved: function():Boolean,
	isRejected: function():Boolean
	isBusy    : function():Boolean
};

doneFilter/failFilter : Function
	// modify or override
	// `pipe` and `then` deferreds are resolved then with this modified values
	= function(): Any
	
	// return another Deferred array to listen for
	// `pipe` and `then` deferreds are bound to this deferred return value
	= function(): Deferred
	
	
Deferred __static__ {
	create: function(fn:function):Function,
	run: function(fn:function):Deferred,
	memoize: function(fn:function):Deferred
};

EventEmitter

var X = Class({
	Extends: Class.EventEmitter,
	//...
});
new X();
new Class.EventEmitter;

EventEmitter __proto__ {
	emit:		function(...args):Self,
	// alias to `emit` fn
	trigger: 	function(...args):Self,
	
	on: function(event, callback):Self,
	once: function(event, callback):Self,
	off: function(event, callback):Self,
	
	// create Function which trigger specific event when is called
	// fn(...args) ~~ x.trigger(event, ...args);
	pipe: function(event): function
	
}

Run tests and build

$ npm install
$ npm test

# build
$ atma

---

(c) 2014 MIT