PHP design pattern Strategy (strategy pattern)_PHP tutorial

Copy code The code is as follows:

/**
* Strategy pattern (Strategy.php)
*
* Define a series of algorithms, encapsulate them one by one, and make them interchangeable. The changes in the algorithm used can be independent of the customers who use it.
*
*/

// ---The following is the closure of a series of algorithms----
interface CacheTable
{
public function get($key);
public function set($key,$value);
public function del($key);
}

// Do not use cache
class NoCache implements CacheTable
{
public function __construct(){
echo "Use NoCache
";
}

public function get($key)
{
return false;
}

public function set ($key,$value)
{
return true;
}

public function del($key)
{
return false;
}
}

// File cache
class FileCache implements CacheTable
{
public function __construct()
{
echo "Use FileCache
";
// File cache constructor
}

public function get($key)
{
// File cache get method implementation
}

public function set($key,$value)
{
//File cache set method implementation
}

public function del($key)
{
/ / File cache del method implementation
}
}

// TTServer
class TTCache implements CacheTable
{
public function __construct()
{
echo "Use TTCache
";
// TTServer cache constructor
}

public function get($key)
{
// TTServer cache get Method implementation
}

public function set($key,$value)
{
// TTServer cached set method implementation
}

public function del ($key)
{
// TTServer cache del method implementation
}
}

// -- The following is a strategy for using no cache -------
class Model
{
private $_cache;
public function __construct()
{
$this->_cache = new NoCache();
}

public function setCache($cache)
{
$this->_cache = $cache;
}
}

class UserModel extends Model
{
}

class PorductModel extends Model
{
public function __construct()
{
$this->_cache = new TTCache();
}
}

// -- Example---
$mdlUser = new UserModel();
$mdlProduct = new PorductModel();
$mdlProduct->setCache(new FileCache()); // Change cache strategy
?>

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