最近一直在纠结 项目分层架构的问题 其中最纠结的就是在项目中 如何引入第三方类库
比如说 有个 msg控制器 要发送邮件
<code>class MsgConstroller extends Constroller { public function send() { $email = new email([options....]); $email->send(); } } </code>
这个控制器通过引入一个 email 工具类 实现了发送 email 的功能 但是如果同时要发送短信呢
<code>class MsgConstroller extends Constroller { public function send() { $email = new email([options....]); $sms = new sms([options....]); $email->send(); $sms->send(); } } </code>
这样感觉很不优雅 所以 我想到了使用个服务层来解决
<code>class MsgConstroller extends Constroller { public function send() { $msg = service('Msg'); //实例化一个Msg服务类 $msg->send('message,email,sms'); //通过send接口传的参数 会同时发送站内信、邮件、短信 } } </code>
但是 这样 又会把 new 操作给转移到服务层 感觉还不是怎么理想 那么 大家有什么比较 简单优雅的解决方案吗?
回复内容:
最近一直在纠结 项目分层架构的问题 其中最纠结的就是在项目中 如何引入第三方类库
比如说 有个 msg控制器 要发送邮件
<code>class MsgConstroller extends Constroller { public function send() { $email = new email([options....]); $email->send(); } } </code>
这个控制器通过引入一个 email 工具类 实现了发送 email 的功能 但是如果同时要发送短信呢
<code>class MsgConstroller extends Constroller { public function send() { $email = new email([options....]); $sms = new sms([options....]); $email->send(); $sms->send(); } } </code>
这样感觉很不优雅 所以 我想到了使用个服务层来解决
<code>class MsgConstroller extends Constroller { public function send() { $msg = service('Msg'); //实例化一个Msg服务类 $msg->send('message,email,sms'); //通过send接口传的参数 会同时发送站内信、邮件、短信 } } </code>
但是 这样 又会把 new 操作给转移到服务层 感觉还不是怎么理想 那么 大家有什么比较 简单优雅的解决方案吗?
你的做法已经可以了。再优化可以再包裹一个有依赖注入的消息类,邮件短信各种类全变成私有变量,操作方法里传入参数控制是否实例化并赋值给私有变量,send方法支持连缀,用起来类似于
<code>$message = new Message(); $result = $message->send(array('mail', 'mail_address'))->send(array('sms', 'tel')); </code>
再切设计模式也是万变不离其宗,又想用着爽又想升级改动的时候好维护是没有出路的。封装粒度太粗好用难改;太细好改难用。
再一个,别什么都跟优雅扯上关系,就两行程序而已哪那么多优雅。
sms和email等同时实现send()方法接口,再用Composite设计模式组合起来怎样?
<code>class MsgConstroller extends Constroller { public function send() { $msg = new MsgComposite(); $msg->add(new email()); $msg->add(new sms()); $msg->send(); } } </code>
new操作现在框架好像都喜欢用统一的ServiceLocator解决,方便统一替换利于单元测试
类似这种需求更合适 Service ,在 Symfony2 中可以使用服务,只需配置好服务可以在全局任何地方调用:
<code>$mailer = $this->get('mailer'); </code>
同理:
<code>$sms = $this->get('sms'); </code>
参考:
http://symfony.com/doc/current/book/service_container.html

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