php设计模式 FlyWeight (享元模式)
<?php/**
* 享元模式
*
* 运用享元技术有效的支持大量细粒度的对象
*/
class CD
{
private$_title=null;
private$_artist=null;
publicfunction setTitle($title)
{
$this->_title =$title;
}
publicfunction getTitle()
{
return$this->_title;
}
publicfunction setArtist($artist)
{
$this->_artist =$artist;
}
publicfunction getArtist($artist)
{
return$this->_artist;
}
}
class Artist
{
private$_name;
publicfunction __construct($name)
{
echo"construct ".$name."
";
$this->_name =$name;
}
publicfunction getName()
{
return$this->_name;
}
}
class ArtistFactory
{
private$_artists=array();
publicfunction getArtist($name)
{
if(isset($this->_artists[$name]))
{
return$this->_artists[$name];
} else {
$objArtist=new Artist($name);
$this->_artists[$name] =$objArtist;
return$objArtist;
}
}
}
$objArtistFactory=new ArtistFactory();
$objCD1=new CD();
$objCD1->setTitle("title1");
$objCD1->setArtist($objArtistFactory->getArtist('artist1'));
$objCD2=new CD();
$objCD2->setTitle("title2");
$objCD2->setArtist($objArtistFactory->getArtist('artist2'));
$objCD3=new CD();
$objCD3->setTitle("title3");
$objCD3->setArtist($objArtistFactory->getArtist('artist1'));代码包下载：
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