A brief discussion on the flyweight pattern of PHP design patterns

Introduction:

The flyweight pattern is a structural design pattern. Use sharing technology to efficiently support large numbers of fine-grained objects.

Applicable scene:

Scenes with the same abstraction but different details.

advantage:

Separate the public parts into abstractions, and the details depend on the abstractions, which conforms to the dependency inversion principle.

shortcoming:

Add complexity.

Code:

//用户类
class User
{
    
    
    private $name;

    function __construct($name)
    {
    
    
        $this->name = $name;
    }

    public function getName()
    {
    
    
        return $this->name;
    }
}

//定义一个抽象的创建网站的抽象类
abstract class WebSite
{
    
    
    abstract public function use(User $user);
}

// 具体网站类
class ConcreteWebSite extends WebSite
{
    
    
    private $name = '';

    function __construct($name)
    {
    
    
        $this->name = $name;
    }

    public function use(User $user)
    {
    
    
        echo "{
      
      $user->getName()}使用我们开发的{
      
      $this->name}" . PHP_EOL;
    }
}

//网站工厂
class WebSiteFactory
{
    
    
    private $flyweights = [];

    public function getWebSiteGategory($key)
    {
    
    
        if (empty($this->flyweights[$key])) {
    
    
            $this->flyweights[$key] = new ConcreteWebSite($key);
        }
        return $this->flyweights[$key];
    }
}

$f = new WebSiteFactory();
$fx = $f->getWebSiteGategory('电商网站 ');
$fx->use(new User('客户A'));

$fy = $f->getWebSiteGategory('电商网站 ');
$fy->use(new User('客户B'));


$fl = $f->getWebSiteGategory('资讯网站 ');
$fl->use(new User('客户C'));

$fm = $f->getWebSiteGategory('资讯网站 ');
$fm->use(new User('客户D'));