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container.js
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container.js
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'use strict';
var Promise = require('bluebird');
/**
* Container
*
* Contains dependencies so we can configure it, pass it around
* and get services/modules from it
**/
var Container = {
modules: {},
/** Registers a module. Each module should return a function
to be called with all its dependencies in order */
registerModule: function(moduleName, dependencies, moduleDef){
if(this.modules[moduleName] !== undefined){
throw new Error('Module ' + moduleName + ' is already registered. Use swapModule() instead.');
}
var moduleReg = {
name: moduleName,
deps: dependencies,
instance: null,
started: false
};
if(typeof(moduleDef) === 'function'){
//check factory signature
if(moduleDef.length !== dependencies.length){
throw new Error('Module' + moduleName + ' factory function arguments don\'t match the passed dependencies');
}
//factory method
moduleReg.factory = moduleDef;
}
else {
//if not a factory, we can't inject deps!
if(dependencies.length > 0){
throw new Error('Module ' + moduleName + ' registered with dependencies without factory');
}
//an Object or already configured service
moduleReg.instance = moduleDef;
}
this.modules[moduleName] = moduleReg;
},
getModule: function(moduleName){
var moduleReg = this.modules[moduleName];
if(moduleReg === undefined){
throw new Error('Module ' + moduleName + ' not found');
}
if(!moduleReg.instance){
var moduleDeps = this.getModuleDeps(moduleReg);
if (this.isClass(moduleReg.factory)) {
moduleDeps.unshift(null);
moduleReg.instance = new (Function.prototype.bind.apply(moduleReg.factory, moduleDeps));
moduleReg.instance.prototype = moduleReg.factory.prototype;
} else {
moduleReg.instance = moduleReg.factory.apply(null, moduleDeps);
}
if (!moduleReg.instance) {
console.warn('Factory did not instantiate anything for "' + moduleName + '"');
}
}
return moduleReg.instance;
},
isClass: function(func) {
return typeof func === 'function' && /^class\s/.test(func+'');
},
clearModule: function(moduleName){
var moduleReg = this.modules[moduleName];
if(moduleReg === undefined){
//do nothing
return;
}
if(moduleReg.instance){
throw new Error('Module ' + moduleName + ' was already instantiated');
}
delete this.modules[moduleName];
},
swapModule: function(moduleName, deps, moduleDef){
this.clearModule(moduleName);
this.registerModule(moduleName, deps, moduleDef);
},
/** Returns one module's dependencies as an Array of initialized modules **/
getModuleDeps: function(moduleRegistry){
var res = [],
self = this;
moduleRegistry.deps.forEach(function(dep){
if(dep === moduleRegistry.name){
throw new Error('Module ' + dep + ' can\'t depend on itself');
}
res.push(self.getModule(dep));
});
return res;
},
reset: function(){
this.modules = {};
},
startModule: function(moduleName, options){
var instance, startRet;
var mod = this.modules[moduleName];
if(!mod){
throw new Error('Module ' + moduleName + ' is not registered');
}
if(mod.started){
return mod.instance;
}
instance = this.getModule(moduleName);
if(!instance){
throw new Error('Module ' + moduleName + ' failed to be instantiated');
}
if(typeof(instance.start) === 'function'){
try {
startRet = instance.start();
}
catch(err){
throw new Error('Module ' + moduleName + ' failed to start: ' + err);
}
}
if(options && !!options.async){
if(typeof(startRet.then) !== 'function'){
throw new Error('Module ' + moduleName + ' start() method does not return a Promise');
}
return startRet.then(function(){
mod.started = true;
return instance;
});
}
else {
mod.started = true;
return instance;
}
},
stopModule: function(moduleName){
var mod = this.modules[moduleName];
if(!mod){ return; }
if(!mod.instance || !mod.started) { return; }
if(typeof(mod.instance.stop) === 'function'){
mod.instance.stop();
}
mod.instance = null;
mod.started = false;
},
startAll: function(){
var moduleKeys = Object.keys(this.modules);
moduleKeys.forEach(function(key){
var moduleReg = this.modules[key];
this.startModule(moduleReg.name);
}, this);
},
stopAll: function(){
var moduleKeys = Object.keys(this.modules);
moduleKeys.forEach(function(key){
var moduleReg = this.modules[key];
this.stopModule(moduleReg.name);
}, this);
},
debug: function(){
console.log('** Container Modules **');
var moduleKeys = Object.keys(this.modules);
moduleKeys.forEach(function(key){
var reg = this.modules[key];
console.log(reg.name, 'instance: ', reg.instance !== undefined ? 'Yes':'No', 'factory:', reg.factory !== undefined ? 'Yes' : 'No');
}, this);
console.log('** Container finished **');
}
};
//Some alias
Container.register = Container.registerModule;
Container.get = Container.getModule;
Container.start = Container.startModule;
Container.stop = Container.stopModule;
module.exports = Container;