54 lines
1.3 KiB
JavaScript
54 lines
1.3 KiB
JavaScript
var App = App || {};
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App.DI = (function() {
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var factories = {};
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var instances = {};
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function get(key) {
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var instance = instances[key];
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if (!instance) {
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var factory = factories[key];
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if (!factory) {
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throw new Error('Unregistered key: ' + key);
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}
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var objectInitializer = factory.initializer;
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var singleton = factory.singleton;
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var deps = resolveDependencies(objectInitializer, factory.dependencies);
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instance = {};
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instance = objectInitializer.apply(instance, deps);
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if (singleton) {
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instances[key] = instance;
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}
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}
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return instance;
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}
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function resolveDependencies(objectIntializer, depKeys) {
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var deps = [];
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for (var i = 0; i < depKeys.length; i ++) {
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deps[i] = get(depKeys[i]);
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}
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return deps;
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}
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function register(key, dependencies, objectInitializer) {
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factories[key] = {initializer: objectInitializer, singleton: false, dependencies: dependencies};
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}
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function registerSingleton(key, dependencies, objectInitializer) {
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factories[key] = {initializer: objectInitializer, singleton: true, dependencies: dependencies};
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}
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function registerManual(key, objectInitializer) {
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instances[key] = objectInitializer();
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}
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return {
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get: get,
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register: register,
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registerManual: registerManual,
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registerSingleton: registerSingleton,
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};
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})();
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