Nickolay - JooseX.Namespace.Depended-0.10
Name
JooseX.Namespace.Depended - a dependencies handling framework for Joose3
SYNOPSIS
Class("MyApp.Widget.Header", {
//declare dependencies
use : [ 'MyApp.Widget.LoginLine', 'MyCompany.Util.Helper'],
does : 'MyApp.Role.Templated',
before : {
initComponent : function () {
//dependencies will be preloaded #1
this.add(new MyApp.Widget.LoginLine({
...
}))
}
},
methods : {
doSomething : function () {
//dependencies will be preloaded #2
MyCompany.Util.Helper.my.doSomething()
}
}
})
or with versions:
Class("MyApp.Widget.Header", {
VERSION : 0.11,
use : [ { 'MyApp.Widget.LoginLine' : 0.03, { 'MyCompany.Util.Helper' : 0.01 } ],
isa : { 'MyApp.Widget.Templated' : 0.01 },
// or
use : {
'MyApp.Widget.LoginLine' : 0.03,
'MyCompany.Util.Helper' : 0.01
}
})
non-Joose code also can be loaded:
Class("MyApp.Widget.Header", {
VERSION : 0.11,
use : {
token : 'http://ajax.googleapis.com/ajax/libs/ext-core/3.1.0/ext-core.js',
presence : 'Ext' // skip load if `Ext` evalutes to true
}
})
load from code:
use({ 'MyApp' : 0.01 }, function () {
MyApp.my.run()
})
DESCRIPTION
JooseX.Namespace.Depended is a dependencies handling framework, tightly integrated with Joose3.
Starting from 0.05 version it also supports the NodeJS modules system.
It allows you to refer to other (not yet loaded) classes/roles in your class declaration.
Framework is highly customizable, additional resources/transport/materialization modes can be easily added. Please refer to JooseX.Namespace.Depended.Authoring for more information.
By default, framework operates in asynchronous mode, using XHR requests for transport and eval for "materialization".
All edge cases like refering to already loaded class, double loading, etc are handled correctly.
CURRENT DEVELOPMENT STATUS
This framework is considered stable and thoroughly tested (more than 300 unit tests, including stress-test). The use case for "pure" Joose classes will be supported without breaking changes.
However, as its not settled down yet, the syntax for loading non Joose code may be changed any time, without prior notice.
USAGE
Dependency descriptor
All dependencies should be specified with the dependency descriptors. In the simplest case, the descriptor is just a plain string with the name of class:
'MyApp.Widget.Header'
In more complex case, the descriptor is an object, which keys are classes names and values - their's versions:
{
'MyApp.Widget.Header' : 0.03,
'MyApp.Util.Helper' : 0.01
}
Such descriptors can contain several dependencies, though they are limited to Joose classes only.
In general case, the dependency descriptor is an object with the following structure:
{
type : 'joose',
token : 'MyApp.Widget.Header',
version : 0.03
}
Such descriptor can contain exactly one dependency, with the resource of any type.
See also delayed dependencies.
The rule
General rule is - whereever in your class declaration you can refer to other class (for example in the does builder) - you can specify the
dependency descriptor instead.
This means, that you can specify the dependencies in:
- `meta` builder (!)
- `isa` builder
- `trait` builder
- `does` builder
For example this declaration is perfectly valid:
Class('Some.Class', {
meta : 'My.Meta',
isa : 'Super.Class',
does : {
'Some.Role' : 0.01,
'Some.Other.Role' : 0.02
},
trait : 'Some.Trait',
...
})
Also in any other custom builder (some authoring required)
The framework will scan class declaration for dependencies, pre-load them, then substitute descriptors with actual classes and continue the declaration process.
use builder
Additionaly, you can provide an array of dependencies (or a single dependency) in the use builder:
Class('Some.Class', {
use : [ 'Some.Other.Class', 'Some.Other.Role' ],
...
})
use from code
You can also load the dependencies from code:
use([ 'Some.Class1', 'Some.Class2' ], function () {
var a = new Some.Class1()
var b = new Some.Class2()
})
Class name -> file name conversion
The class name you are refering to, will be converted to file name using this simple scheme:
class name: MyClass
file name: MyClass.js
class name: Some.Class
file name: Some/Class.js
class name: Some.Other.Class
file name: Some/Other/Class.js
Generally each dot is replaced with directory separator, and the 'js' extension is appended to result
The libraries
The framework can look up the classes in several libraries, which are just the directories, containing the source files.
The current list of libraries is stored as an array in: JooseX.Namespace.Depended.Manager.my.INC. Its also aliased as use.paths. Default value is:
use.paths = [ 'lib', '/jsan/index.html' ]
You can freely modify this value, however it will be a good idea to use only methods of array, which mutates it in-place.
For example, if you are running a test harness, as t/index.html, and would like to refer
to your files, which are in lib/, you'll need to add the ../lib entry with:
use.paths.unshift('../lib')
Framework will scan through the libraries list sequentially and attempt to load the class from every entry. Class will be loaded from the first library, which contains the corresponded file. If there are no such file, loading will continue to another entry.
For example, if we are loading class Some.Class, and we have the default setting for libraries, then first it will be tried to load with the following URL:
lib/Some/Class.js
If there are no such file, the 2nd entry will be tried:
/jsan/Some/Class.js
If there are no such file again, the exception will be thrown.
ATTRIBUTE HELPER
This package adds a new attribute initializer: Joose.I.FutureClass
It can be used, when the default value of the attribute should be set to the constructor of some class, which may be not yet loaded on the declaration stage:
Class('MyApp.Widget.Template', {
use : 'MyApp.Util.Helper',
has : {
helperClass : Joose.I.FutureClass('MyApp.Util.Helper')
}
})
DELAYED DEPENDENCIES
You can also specify a "delayed" dependency descriptors, using the attribute helper:
Class('Some.Class', {
use : 'Task.Some.Bundle',
does : Joose.I.FutureClass('Some.Role.From.Bundle')
})
or just an arbitrary function (function shouldn't has a meta property):
Class('Some.Class', {
use : 'Task.Some.Bundle',
does : function () { return Some.Role.From.Bundle }
})
The framework won't attempt to load such descriptors. Instead, the provided function will called before class construction (when other "real dependencies" were already loaded). Function is supposed to return a class (or role) which will be used as part of the class declaration.
This feature is useful for example, when you'd like to depend from a file, containing definitions of several roles, and you'd like to use those roles in your class.
LOADING NON-JOOSE CODE
To load non-joose code, specify the descriptor with the 'javascript' type and with url to the source in token, as follows:
{
type : 'javascript',
token : '/doc/s/sa/samuraijack/JooseX/Namespace/Depended/010/lib/JooseX/Namespace/MyApp/Widget/Header.js',
presence : function () {
return MyApp.Widget.Header
}
}
Note the presence field. presence is function which should return true value, if the
resource is already presented in the scope (for example has been loaded with the <script> tag). In such case,
the loading of resource will be skipped. presence can be specified as string, which will be evaled (exceptions are caught).
type : 'javascript' is optional if token contains "/index.html" or ends with "/doc/s/sa/samuraijack/JooseX/Namespace/Depended/010/lib/JooseX/Namespace/.js". So, the descriptor above
could be also written as:
{
token : '/doc/s/sa/samuraijack/JooseX/Namespace/Depended/010/lib/JooseX/Namespace/MyApp/Widget/Header.js',
presence : 'MyApp.Widget.Header'
}
If the url in token is relative, then the it will prepended with paths from use.paths (each path will be checked, sequentially).
If the url is absolute (starts with "/index.html" or "http://") or starts with "=" then it will be used directly and use.paths will be ignored:
{
token : '/doc/s/sa/samuraijack/JooseX/Namespace/Depended/010/lib/JooseX/Namespace/MyApp/Widget/Header.js', // ignore `use.path` settings
presence : 'MyApp.Widget.Header'
}
Also, when specifying the descriptor as string, the type of the descriptor will be switched to 'javascript' if it contains the "/index.html" or ends with "/doc/s/sa/samuraijack/JooseX/Namespace/Depended/010/lib/JooseX/Namespace/.js":
use('http://ajax.googleapis.com/ajax/libs/ext-core/3.1.0/ext-core.js', function () {
...
})
The code above will load "ext-core" library. However, currently there is no way to specify the presence attribute in such descriptor
and no checks will be performed prior loading (potentially allowing repeated loading). This may change in future versions.
USING THIS EXTENSION WITH NODEJS
When using this framework on NodeJS platform, the use.paths will be and alias for require.paths.
For additional information, please refer to the documentation of the Task.Joose.NodeJS
GROUPED LOADING MODE
This framework can operate in special mode, in which it can load any class, with any number of dependencies (in-depth), with 2 http requests.
For more information about this mode please refer to http://www.extjs.com/forum/showthread.php?t=69161
This item is currently in TODO list.
GETTING HELP
This extension is supported via github issues tracker: http://github.com/SamuraiJack/JooseX-Namespace-Depended/issues
For general Joose questions you can also visit #joose on irc.freenode.org or the mailing list at http://groups.google.com/group/joose-js
SEE ALSO
Base resource class: JooseX.Namespace.Depended.Resource
Web page of this module: http://github.com/SamuraiJack/JooseX-Namespace-Depended/
General documentation for Joose: http://openjsan.org/go/?l=Joose
BUGS
All complex software has bugs lurking in it, and this module is no exception.
Please report any bugs through the web interface at http://github.com/SamuraiJack/JooseX-Namespace-Depended/issues
AUTHORS
Nickolay Platonov nplatonov@cpan.org
COPYRIGHT AND LICENSE
Copyright (c) 2010, Nickolay Platonov
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
- Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
- Neither the name of Nickolay Platonov nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Role('JooseX.Namespace.Depended', {
/*VERSION*/VERSION : 0.10,
meta : Joose.Managed.Role,
requires : [ 'prepareProperties' ],
have : {
containResources : [ 'use', 'meta', 'isa', 'does', 'trait', 'traits' ]
},
override: {
prepareProperties : function (name, extend, defaultMeta, callback) {
if (name && typeof name != 'string') {
extend = name
name = null
}
extend = extend || {}
var summaredDeps = []
var extendMy = extend.my
//gathering all the related resourses from various builders
//also gathering resourses of 'my'
Joose.A.each(this.containResources, function (propName) {
this.collectDependencies(extend[propName], summaredDeps, extend, propName)
if (extendMy && extendMy[propName]) this.collectDependencies(extendMy[propName], summaredDeps, extendMy, propName)
}, this)
//and from externally collected additional resources
this.alsoDependsFrom(extend, summaredDeps)
var resource = JooseX.Namespace.Depended.Manager.my.getResource({
type : 'joose',
token : name
})
if (extend.VERSION) resource.setVersion(extend.VERSION)
//BEGIN executes right after the all dependencies are loaded, but before this module becomes ready (before body())
//this allows to manually control the "ready-ness" of module (custom pre-processing)
//BEGIN receives the function (callback), which should be called at the end of custom processing
if (extend.BEGIN) {
resource.setOnBeforeReady(extend.BEGIN)
delete extend.BEGIN
}
Joose.A.each(summaredDeps, function (descriptor) {
resource.addDescriptor(descriptor)
})
//skip constructing for classes w/o dependencies
if (Joose.O.isEmpty(resource.dependencies)) {
this.inlineDependencies(extend)
var res = this.SUPER(name, extend, defaultMeta, callback)
//this will allow to classes which don't have dependencies to be ready synchronously
resource.checkReady()
return res
} else {
// defer the dependencies loading, because they actually could be provided later in the same bundle file
// this, however, affect performance, so bundles should be created in the dependencies-ordered way
setTimeout(function () {
resource.handleDependencies()
}, 0)
// debugging warning
if (typeof ENABLE_DEFERRED_DEPS_WARNING != 'undefined')
console.log('Deferred deps handling for class [' + name + '], deps = [' + JSON.stringify(resource.dependencies) + ']')
}
var me = this
//unshift is critical for correct order of readyListerens processing!
//constructing is delaying until resource will become ready
resource.readyListeners.unshift(function () {
me.inlineDependencies(extend)
me.prepareProperties(name, extend, defaultMeta, callback)
})
return this.create(name, Joose.Namespace.Keeper, {})
},
create : function () {
var meta = this.SUPERARG(arguments).meta
meta.resource = meta.resource || JooseX.Namespace.Depended.Manager.my.getMyResource('joose', meta.name, meta.c)
return meta.c
}
},
//eof override
methods : {
alsoDependsFrom : function (extend, summaredDeps) {
},
collectDependencies : function (from, to, extend, propName) {
Joose.A.each(Joose.O.wantArray(from), function (descriptor) {
if (descriptor && typeof descriptor != 'function') to.push(descriptor)
})
},
inlineDependencies : function (extend) {
this.inlineDeps(extend)
var extendMy = extend.my
if (extendMy) this.inlineDeps(extendMy)
},
inlineDeps : function (extend) {
delete extend.use
Joose.A.each(this.containResources, function (propName) {
if (extend[propName]) {
var descriptors = []
Joose.A.each(Joose.O.wantArray(extend[propName]), function (descriptor, index) {
var descType = typeof descriptor
if (descType == 'function')
descriptors.push(descriptor.meta ? descriptor : descriptor())
else
if (descType == 'object')
if (descriptor.token)
descriptors.push(eval(descriptor.token))
else
Joose.O.each(descriptor, function (version, name) {
descriptors.push(eval(name))
})
else
if (descType == 'string')
descriptors.push(eval(descriptor))
else
throw "Wrong dependency descriptor format: " + descriptor
})
if (propName != 'isa' && propName != 'meta')
extend[propName] = descriptors
else
if (descriptors.length > 1)
throw "Cant specify several super- or meta- classes"
else
extend[propName] = descriptors[0]
}
})
}
}
})
Joose.Namespace.Manager.meta.extend({
does : JooseX.Namespace.Depended
})
Joose.Namespace.Keeper.meta.extend({
after: {
copyNamespaceState: function (targetClass) {
targetClass.meta.resource = this.resource
}
}
})