业务代表模式

//businessDelegate
interface BusinessService
{
    public function doProcessing();
}

class EJBService implements BusinessService
{
    public function doProcessing()
    {
        echo 'Processing task by invoking EJB Service' . "
";
    }
}


class JMSService implements BusinessService
{
    public function doProcessing()
    {
        echo 'Processing task by invoking JMS Service'. "
";
    }
}

class BusinessLookUp
{
    public function getBusinessService($serviceType)
    {
        //返回0就是相等
        if (!strcasecmp('EJB', $serviceType)) {
            return new EJBService();
        } else {
            return new JMSService();
        }
    }
}

class BusinessDelegate
{
    private $lookupService = null;
    private $businessService = null;
    private $serviceType = null;
    
    public function __construct()
    {
        $this->lookupService = new BusinessLookUp;
    }
    
    public function setServiceType($serviceType)
    {
        $this->serviceType = $serviceType;
    }
    
    public function doTask()
    {
        $this->businessService = $this->lookupService->getBusinessService($this->serviceType);
        $this->businessService->doProcessing();
    }
}

class Client
{
    public $businessService = null;
    
    public function Client($businessService)
    {
        $this->businessService = $businessService;
    }
    
    public function doTask()
    {
        $this->businessService->doTask();
    }
}


$BusinessDelegate = new BusinessDelegate();
$BusinessDelegate->setServiceType("EJB");

$Client = new Client($BusinessDelegate);
$Client->doTask();

$BusinessDelegate->setServiceType("JMS");
$Client->doTask();

参考文章 http://www.runoob.com/design-pattern/business-delegate-pattern.html