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请教SMARTY 发帖后clearCache 文章列表的逻辑

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Jun 23, 2016 pm 01:51 PM

postarticlelogic

文章列表的samrty代码如下

$smarty -> setCacheDir(ROOT_PATH."/cache/forum");$smarty -> display("$module/list.html",$_SERVER["REQUEST_URI"]);

ROOT_PATH = 我的根目录
$module = 我PHP开头会自定当前是什么模组，自己找模板中的子目录

因为文章多, 架构多, 不同的模组也多...所以想到把cache 和 template都做成子目录
template子目录为了方便找文件
cache子目录...是因为怕同一个目录中文件过多，分子目录也会以便我按照不同的模组清理缓存

我在display加入了一句：$_SERVER["REQUEST_URI"]

因为是分页，还有可能是其他的变量

我页面上暂时最多有可能有3个参数  list.php?fid=1&type=20&page=3

fid=栏目  (必定有)
type=主题分类   (看情况, 有些页面有, 有些页面没有)
page=当前页面  (必定有)

因为参数不同，所以也可能生成不同的文件

使用smarty主要就是为了减轻数据库压力

问题一.

我在一个名为post.php的页面发表文章

发表完成时会有一些基本的数据，好比$fid = 1 (栏目id)，我就想用此栏目id，把当然栏目的cache 清理

就是这个： list.php?fid=1&type=20&page=3

有办法有所有fid = 1有关的都清理吗?

就是只要fid = 1 ，不管其他参数type=100还是type=5，还有所有page=xxx的都更新吗?

问题二.
SMARTY官方和网上搜到的简介....
清空CACHE只有这一句

clear_cache('index.tpl',cache_id);//清除指定id的缓存

并不能清空指定的目录
因为上面也解释过我是有用模板子目录的

问题三.
经验一问

如果我想更实时一点，网站又蛮多人上的，我把解决问题一和问题二，反而把samrty cache时间设成10秒

那如果是一个长期有500~2000人的网站，用户常常留言/交流的网站

我设成10秒左右的缓存会不会比起不缓存更大压力???

我这种情况大家会把流量写得更...每次回帖/发文章都清空缓存，还是直接放弃缓存?

不好意思，已经没什么分献给各位大哥了

诚心求学

回复讨论(解决方案)

一直变化的不建议使用缓存，也可以采用像QQ空间那样用ajax来加载。这个只是我的愚见。

比?奇怪，既然你比?注重的是??，那就不?用?存了。
即使要用?存，那都需要每?行完一?事件後，??的?存就必?重新生成。才能?到??的效果。

?於文章列表，如果你一天?，每分?都?增加或修改新文章的。那?存的作用就不大。

如果是一天?，可能新增的文章?修改?不多。那可以在後?做一?功能。?用?清一次列表的?存。

其?保存?存的路?，目???你都知道，完全可以自己?一?清cache的???啊，?甚?要??用smarty自?的呢？
smarty是按cacheid做判?的，不?合你的情?。

比较奇怪，既然你比较注重的是实时，那就不应用缓存了。
即使要用缓存，那都需要每执行完一个事件后，对应的缓存就必须重新生成。才能达到实时的效果。

对于文章列表，如果你一天内，每分钟都会增加或修改新文章的。那缓存的作用就不大。

如果是一天内，可能新增的文章与修改数不多。那可以在后台做一个功能。调用则清一次列表的缓存。

其实保存缓存的路径，目录规则你都知道，完全可以自己写一个清cache的类实现啊，为甚么要纠结用smarty自带的呢？
smarty是按cacheid做判断的，不适合你的情况。

所以我在想

我的列表像论坛一样，按照最新回覆排列

如果每分钟...甚至每10~20秒都有人回覆.....而列表又有30~40页的话

每10~20秒都要清理一次CACHE

不管是 回覆文章后的满足条件而清理， 还是自动设定CACHE有效时间为15秒

要不停的清理缓存文件...然后而生成缓存....是否都比起不缓存更加重主机负担???

自推一把，求建议

列表页缓存应在相关文章添加时删除
列表页缓存可在再次访问时自动生成，也可在文章发布后主动生成
如果是采用后者，那么列表页可直接为静态，或缓存永不过期。以减少检查缓存是否过期的开销

谢谢你
但如果大约每分钟都有2~3个回覆

列表是以最新回覆排序

如果列表已有30~40分
每次排序不是也要删除再生成30~40页页吗?

你建议使用CACHE吗?

你的列表是论坛的帖子列表吗？这一点你并没有说明噢
如果是，在不需要缓存
如果是文章列表，可以缓存。因为回覆不影响列表顺序。至多影响到“最新动态”列表

主动生成列表页或清除缓存时，都是以导航条跨距为限的
因为访问超出导航条跨距的页面时，缓存早就已经过期了

如果两三分钟就用新文章上线，就表示这个网站活动频繁。所以缓存就是非常必要的了

其实系统和论坛几乎就是一样了

因为其他功能关系到会员权和积分，所以没用别人的，只能自己做个简单的

是自己用PHP+SMARTY做的

如果是论坛列表就不用缓存了?

只要回覆会影响到排名...就不建议做缓存了是吧?

顺道一问，不知大家了不了解，DZ,PW他们是不是只有首页做了cache，列表文章都没有cache的?

这与你的具体应用是有关系的
论坛总是要把新帖和有新回复的放在前面，以引起注意
所以缓存就没有意义了

谢谢

明白了

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