responsibility php design pattern Chain Of Responsibility chain of responsibility pattern

复制代码 代码如下:

/**
* Chain of Responsibility Pattern
*
* In order to decouple the sender and receiver of the request, multiple objects are used to process the request, connect these objects into a chain, and pass them along this chain the request until an object handles it
*
*/
abstract class Handler
{
protected $_handler = null;
public function setSuccessor($handler)
{
$this->_handler = $handler;
}
abstract function handleRequest($request);
}
class ConcreteHandlerZero extends Handler
{
public function handleRequest($request)
{
if($request == 0)
{
echo "0
";
} else {
$this->_handler->handleRequest($request);
}
}
}
class ConcreteHandlerOdd extends Handler
{
public function handleRequest($request)
{
if($request % 2)
{
echo $request." is odd
";
} else {
$this->_handler->handleRequest($request);
}
}
}
class ConcreteHandlerEven extends Handler
{
public function handleRequest($request)
{
if(!($request % 2))
{
echo $request." is even
";
} else {
$this->_handler->handleRequest($request);
}
}
}
// 实例一下
$objZeroHander = new ConcreteHandlerZero();
$objEvenHander = new ConcreteHandlerEven();
$objOddHander = new ConcreteHandlerOdd();
$objZeroHander->setSuccessor($objEvenHander);
$objEvenHander->setSuccessor($objOddHander);
foreach(array(2,3,4,5,0) as $row)
{
$objZeroHander->handleRequest($row);
}

以上就介绍了responsibility php设计模式 Chain Of Responsibility 职责链模式，包括了responsibility方面的内容，希望对PHP教程有兴趣的朋友有所帮助。