本文实例讲述了Zend Framework教程之Zend_Controller_Plugin插件用法。分享给大家供大家参考,具体如下:
通过Zend_Controller_Plugin可以向前端控制器增加附加的功能。便于w一些特殊功能。以下是Zend_Controller_Plugin的简单介绍。
Zend_Controller_Plugin的基本实现
├── Plugin
│ ├── Abstract.php
│ ├── ActionStack.php
│ ├── Broker.php
│ ├── ErrorHandler.php
│ └── PutHandler.php
Zend_Controller_Plugin_Abstract
abstract class Zend_Controller_Plugin_Abstract
{
protected $_request;
protected $_response;
public function setRequest(Zend_Controller_Request_Abstract $request)
{
$this->_request = $request;
return $this;
}
public function getRequest()
{
return $this->_request;
}
public function setResponse(Zend_Controller_Response_Abstract $response)
{
$this->_response = $response;
return $this;
}
public function getResponse()
{
return $this->_response;
}
/**
* Called before Zend_Controller_Front begins evaluating the
* request against its routes.
*
* @param Zend_Controller_Request_Abstract $request
* @return void
*/
public function routeStartup(Zend_Controller_Request_Abstract $request)
{}
/**
* Called after Zend_Controller_Router exits.
*
* Called after Zend_Controller_Front exits from the router.
*
* @param Zend_Controller_Request_Abstract $request
* @return void
*/
public function routeShutdown(Zend_Controller_Request_Abstract $request)
{}
/**
* Called before Zend_Controller_Front enters its dispatch loop.
*
* @param Zend_Controller_Request_Abstract $request
* @return void
*/
public function dispatchLoopStartup(Zend_Controller_Request_Abstract $request)
{}
/**
* Called before an action is dispatched by Zend_Controller_Dispatcher.
*
* This callback allows for proxy or filter behavior. By altering the
* request and resetting its dispatched flag (via
* {@link Zend_Controller_Request_Abstract::setDispatched() setDispatched(false)}),
* the current action may be skipped.
*
* @param Zend_Controller_Request_Abstract $request
* @return void
*/
public function preDispatch(Zend_Controller_Request_Abstract $request)
{}
/**
* Called after an action is dispatched by Zend_Controller_Dispatcher.
*
* This callback allows for proxy or filter behavior. By altering the
* request and resetting its dispatched flag (via
* {@link Zend_Controller_Request_Abstract::setDispatched() setDispatched(false)}),
* a new action may be specified for dispatching.
*
* @param Zend_Controller_Request_Abstract $request
* @return void
*/
public function postDispatch(Zend_Controller_Request_Abstract $request)
{}
/**
* Called before Zend_Controller_Front exits its dispatch loop.
*
* @return void
*/
public function dispatchLoopShutdown()
{}
}
Zend_Controller_Plugin_Abstract声明定义了Zend_Controller运行过程中的几个关键事件位置。用户可以通过指定的方法,对指定位置的请求和相应对象进行相关操作。
Zend_Controller_Plugin_Abstract中方法的描述如下:
routeStartup() 在 Zend_Controller_Front 向注册的 路由器 发送请求前被调用。
routeShutdown()在 路由器 完成请求的路由后被调用。
dispatchLoopStartup() 在 Zend_Controller_Front 进入其分发循环(dispatch loop)前被调用。
preDispatch() 在动作由 分发器 分发前被调用。该回调方法允许代理或者过滤行为。通过修改请求和重设分发标志位(利用 Zend_Controller_Request_Abstract::setDispatched(false) )当前动作可以跳过或者被替换。
postDispatch() 在动作由 分发器 分发后被调用。该回调方法允许代理或者过滤行为。通过修改请求和重设分发标志位(利用 Zend_Controller_Request_Abstract::setDispatched(false) )可以指定新动作进行分发。
dispatchLoopShutdown() 在 Zend_Controller_Front 推出其分发循环后调用。
Zend_Controller_Plugin提供的默认插件:
Zend_Controller_Plugin_Broker:插件经纪人,用于注册,管理自定义的Zend_Controller插件。具体用法,可以参考类代码。
Zend_Controller_Plugin_ActionStack:用于管理动作堆栈。具体用法,可以参考类代码。
Zend_Controller_Plugin_ErrorHandler:用来处理抛出的异常。具体用法,可以参考类代码。
Zend_Controller_Plugin_PutHandler:用于处理请求操作 PUT 。具体用法,可以参考类代码。
Zend_Controller_Plugin_Broker
<"' . $stackIndex . '" already registered');
}
$this->_plugins[$stackIndex] = $plugin;
} else {
$stackIndex = count($this->_plugins);
while (isset($this->_plugins[$stackIndex])) {
++$stackIndex;
}
$this->_plugins[$stackIndex] = $plugin;
}
$request = $this->getRequest();
if ($request) {
$this->_plugins[$stackIndex]->setRequest($request);
}
$response = $this->getResponse();
if ($response) {
$this->_plugins[$stackIndex]->setResponse($response);
}
ksort($this->_plugins);
return $this;
}
/**
* Unregister a plugin.
*
* @param string|Zend_Controller_Plugin_Abstract $plugin Plugin object or class name
* @return Zend_Controller_Plugin_Broker
*/
public function unregisterPlugin($plugin)
{
if ($plugin instanceof Zend_Controller_Plugin_Abstract) {
// Given a plugin object, find it in the array
$key = array_search($plugin, $this->_plugins, true);
if (false === $key) {
require_once 'Zend/Controller/Exception.php';
throw new Zend_Controller_Exception('Plugin never registered.');
}
unset($this->_plugins[$key]);
} elseif (is_string($plugin)) {
// Given a plugin class, find all plugins of that class and unset them
foreach ($this->_plugins as $key => $_plugin) {
$type = get_class($_plugin);
if ($plugin == $type) {
unset($this->_plugins[$key]);
}
}
}
return $this;
}
/**
* Is a plugin of a particular class registered"htmlcode">
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