<?php
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/**
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* 服务定位器[暂定版]
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*/
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class System_Service_Locator{
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protected $_components; //保存组件实例
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protected $_definitions; //保存组件定义
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public static $instance;
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public static function getInstance(){
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if(self::$instance){
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return self::$instance;
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}
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return self::$instance = new self;
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}
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public function __get($name)
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{
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return $this->get($name);
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}
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/**
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* 注册服务
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* @param $name
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* @param $definition
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*/
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public function set($name, $definition)
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{
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if(is_string($definition) || is_object($definition) || is_callable($definition, true)) {
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$this->_definitions[$name] = $definition;
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}else{
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throw new InvalidArgumentException('Invalid definition.');
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}
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}
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/**
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* 数组方式注册服务
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* @param [type] $definitions [description]
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*/
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public function setByArrs($definitions){
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foreach ($components as $id => $definition) {
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$this->set($id, $definition);
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}
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}
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/**
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* 读取服务
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* @param $name
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* @return mixed
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*/
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public function get($name)
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{
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if(isset($this->_components[$name])){
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return $this->_components[$name];
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}
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if(!isset($this->_definitions[$name])){
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return false;
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}
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if(is_string($this->_definitions[$name]) && class_exists($this->_definitions[$name])){
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return $this->_components[$name] = new $this->_definitions[$name];
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}
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if(is_callable($this->_definitions[$name], true)){
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return $this->_components[$name] = call_user_func_array($this->_definitions[$name], []);
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}
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throw new InvalidArgumentException("Undefined service $name");
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}
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/**
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* @param $name
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* @return bool
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*/
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public function has($name)
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{
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return isset($this->_definitions[$name]);
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}
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/**
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* @param $name
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*/
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public function clear($name)
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{
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unset($this->_components[$name], $this->_definitions[$name]);
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}
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/**
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* @return mixed
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*/
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public function getComponents()
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{
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return $this->_components;
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}
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/**
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* @return mixed
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*/
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public function getDefintions()
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{
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return $this->_definitions;
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}
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}
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