class OrderRepository private source public function setSource IOrderS

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class OrderRepository
{
private $source;
public function setSource(IOrderSource $source)
{
$this->source = $source;
}
public function load($orderID)
{
return $this->source->load($orderID);
}
public function save($order){/*...*/}
public function update($order){/*...*/}
}
interface IOrderSource
{
public function load($orderID);
public function save($order);
public function update($order);
public function delete($order);
}
class MySQLOrderSource implements IOrderSource
{
public function load($orderID);
public function save($order){/*...*/}
public function update($order){/*...*/}
public function delete($order){/*...*/}
}
class ApiOrderSource implements IOrderSource
{
public function load($orderID);
public function save($order){/*...*/}
public function update($order){/*...*/}
public function delete($order){/*...*/}
}