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/** |
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* An utility class to manage services. |
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* You can define your own services, share instances between components and create |
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* new instances when necessaru |
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* |
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* @class ServicesContainer |
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*/ |
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class ServicesContainer { |
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/** |
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* Creates an instance of ServicesContainer. |
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* |
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* |
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* @memberOf ServicesContainer |
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*/ |
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constructor() { |
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this._instances = {}; |
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this._map = {}; |
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} |
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/** |
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* Register new services. |
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* @param {String} serviceName name of the service (how clients will use it) |
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* @param {Class|Function} service the class/constructor of the service |
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*/ |
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define(serviceName, service) { |
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this._map[serviceName] = service; |
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} |
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/** |
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* Register an instance of a service. If you only set the instance but not |
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* the constructor (with the define method) this service will be like an singleton. |
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* Nobody will be able to create an new instance of the service via ServicesContainer |
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* |
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* @param {String} serviceName |
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* @param {Object} instance |
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*/ |
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setInstance(serviceName, instance) { |
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this._instances[serviceName] = instance; |
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} |
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/** |
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* Get an instance of a service. If the instance doens't exists yet it will |
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* instantiate it and return |
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* @param {String} serviceName |
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* @returns {Object} |
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*/ |
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get(serviceName) { |
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if (!this._instances.hasOwnProperty(serviceName)) { |
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this.setInstance(serviceName, this.getNewInstance(serviceName)); |
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} |
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return this._instances[serviceName]; |
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} |
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/** |
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* Get a new instance of a service. Note that if you do not provide an constructor/class, |
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* this method will fail |
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* @param {String} serviceName |
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*/ |
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getNewInstance(serviceName) { |
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if (this._instances.hasOwnProperty(serviceName) && !this._map.hasOwnProperty(serviceName)) { |
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throw new Error(`Service ${serviceName} is an singleton, you cannot create a new instance`); |
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} |
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if (!this._map.hasOwnProperty(serviceName)) { |
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throw new Error(`Service ${serviceName} not found`); |
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} |
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return new this._map[serviceName](); |
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} |
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} |
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export default ServicesContainer; |
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beeblebrox3 /
star
