队列在编程中的实际应用(php)_php技巧
一：队列的概念、数据结构
队列（Queue）是运算受到限制的一种线性表。只允许在表的一端进行插入，而在另一端进行删除元素的线性表。队尾（rear）是允许插入的一端。队头（front）是允许删除的一端。空队列是不含元素的空表。
假设有个队列Q=（a1，a2，…，an），则a1为队头元素，an为队尾元素。元素入队的次序为a1，a2，…，an，而出队的次序为a1，a2，…，an。可见队列的操作是按照先进先出的原则进行的。
其他详细的介绍请在网上搜索很多资料。
二：PHP的队列
在PHP中队列以数组的形式表现。数组中的第一个元素作为队头，最后一个元素作为队尾，这样就可以操作这个队列了。
结果就是
网上有很多封装好的类，可以直接使用。
array_push：将一个或多个单元压入数组的末尾（入栈）
array_unshift：在数组开头插入一个或多个单元
array_pop：将数组最后一个单元弹出（出栈）
array_shift：将数组开头的单元移出数组
三：Ruby Starling
Starling是一个支持MemCache协议的轻量级持久化服务器。Starling是让创建网络访问队列或者多个队列异常简单，也就是说多点和多台机器间的异步工作进程。它是著名微博客网站Twitter开发用来处理大量的队列消息，以及保持服务的响应。Starling已经在生产环境中使用，不仅是Twitter在使用，FiveRuns同样在使用。FiveRuns甚至还根据自己的应用做了改进。
Starling和Memcache使用的是一个协议只是端口不一样。Starling使用的是22122端口，Memcache使用的是11211端口。
|
Ruby
tar xzvf ruby-1.9.1-p0.tar.gz
cd ruby-1.9.1-p0
./configure --prefix=/usr/local/huiyangruby
make
make install
Gem
tar -zxvf rubygems-1.3.6.tgz
cd rubygems-1.3.6
ruby setup.rb
Starling
gem install memcache-client starling
starling
starling & //后台执行
starling_top //查看PS信息
|
接下来你就可以使用队列做自己的事情啦。Starling和Memcache用法一样，两者配合处理更佳。
使用Memcache：：addServer可以建立一个memcache连接池。他不同于connect与pconnect他是在有请求是才连接，无则端口连接。
Memcache：：connect -- 打开一个到Memcache的连接。
Memcache：：pconnect -- 打开一个到Memcache的长连接。
Memcache：：close -- 关闭一个Memcache的连接。
Memcache：：set -- 保存数据到Memcache服务器上。
Memcache：：get -- 提取一个保存在Memcache服务器上的数据。
Memcache：：replace -- 替换一个已经存在Memcache服务器上的项目（功能类似Memcache：：set）。
Memcache：：delete -- 从Memcache服务器上删除一个保存的项目。
Memcache：：flush -- 刷新所有Memcache服务器上保存的项目（类似于删除所有的保存的项目）。
Memcache：：getStats -- 获取当前Memcache服务器运行的状态。
四：张宴作品HTTPSQS
HTTPSQS（HTTP Simple Queue Service）是一款基于 HTTP GET/POST 协议的轻量级开源简单消息队列服务，使用 Tokyo Cabinet 的 B+Tree Key/Value 数据库来做数据的持久化存储。
有兴趣的可以看看网址：http://blog.s135.com/httpsqs_1_2/
五：队列的应用
队列可以很好地异步处理数据传送和存储，当你频繁地向数据库中插入数据、频繁地向搜索引擎提交数据，就可采取队列来异步插入。另外，还可以将较慢的处理逻辑、有并发数量限制的处理逻辑，通过消息队列放在后台处理，例如FLV视频转换、发送手机短信、发送电子邮件等。（文/侯惠阳 PHPer.yang）
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