大体的思想,每一个促销要新建一个促销类,有专门的开关来控制是否生效。
用商品里面的促销识别码来判断具体调用哪一个促销实例。
首先,在添加商品的时候,分两步,第一步是添加状态,第二步是把购物车内的商品显示这个状态。
一,添加步骤几个重要的点:
1,添加商品之前,遍历所有的促销互斥条件。
例如,某一款商品不可以和另一个商品同时在一个购物车内;或者某个用户权限,不可以购买特定的一件商品等等。
2,添加商品之前,选择特定的促销实例,来进行添加之前的操作。
注:第二点与第一点的区别在于1是要遍历所有的促销实例,而2是单独的一条。
3,添加商品后,根据特定的促销实例,所要进行的操作。
复制代码 代码如下:
/**
* 向购物车内添加商品
* @param int $goods_id 商品ID
* @param string $goods_spec 商品规格
* @param int $goods_number 商品数量
* @param string $promote_name 商品参加活动
* @return bool
*/
public function goodsAdd($goods_id, $goods_spec, $goods_number, $promote_name)
{
//获取所有有效的促销实例
$rules = $this->_getAllRuleInstance();
foreach($this->_rules as $instance)
{
//换礼互斥判断
if(!$instance->goodsExclusion($goods_id, $goods_spec))
{
return false;
}
}
//获取商品单独的促销实例
$rule = $this->_getRuleInstance($promote_name);
//添加商品之前操作
if($rule->beforeGoodsAdd())
{
$rule->goodsAdd($goods_id, $goods_spec, $goods_number);
//添加商品之后操作
return $rule->afterGoodsAdd();
}
return false;
}
复制代码 代码如下:
/**
* 获取可用规则实例列表
* @return array
*/
private function _getAllRuleInstance()
{
if(empty($this->_rules))
{
$dir = dirname(__FILE__).'/Cart/Rule/';
$dir_handle = opendir($dir);
while($file = readdir($dir_handle))
{
if(is_file($dir.$file))
{
$instance = $this->_getRuleInstance(substr($file, 0, strpos($file, '.')));
if($instance->enabled())
{
$this->_rules[] = $instance;
}
}
}
}
return $this->_rules;
}
复制代码 代码如下:
/**
* 获取购物车规则类
* @param string $name 规则名称
* @return Bll_Shop_Cart_Rule
*/
private function _getRuleInstance($name)
{
$rule_name = 'Bll_Shop_Cart_Rule_'.$name;
try
{
Zend_Loader::loadClass($rule_name);
$this->_rule = new $rule_name();
$this->_rule->setCart($this);
return $this->_rule;
}catch (Exception $e)
{
Bll_LogWriter::logException('购物规则对象加载异常. rule_name:'.$rule_name);
throw new Exception('购物规则对象加载异常.');
}
}
这里主要用到的促销是,判断某一个人是否有添加这个商品的权限,打折等。
二,遍历购物车商品的操作
这一步要执行关键操作是遍历所有促销策略的检查列表函数。
这里常常可以用到的促销是满多少钱,送赠品,买二送一等等。
复制代码 代码如下:
/**
* 获取购物车内商品清单对象列表
* @return array Bll_Shop_Cart_Rule
*/
public function goodsViewList()
{
$list = $this->getGoodsList();
// 在列表时检查购物车内商品列表
$rules = $this->_getAllRuleInstance();
foreach($this->_rules as $instance)
{
$instance->setGoodsList($list)->goodsCheckList();
$this->_tip_rules[] = $instance;
}
//获取最新购物车列表
$goods_list = $this->_cart->getGoodsList();
return $goods_list;
}
第三,提交订单之前的操作
有一些类型的促销,比如某人有打折的权限,当下完订单后,这个打折的权限就被用掉了;或者在下单之前要先检查这个订单的金额,如果小于多少就不准下这个订单等等。
以上这些都会用到提交订单之前的操作。

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