PHP   发布时间:2019-11-18  发布网站:大佬教程  code.js-code.com
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对于一个很大的消息队列,频繁进行进行大数据库的序列化 和 反序列化,有太耗费。下面是我用php 实现的一个消息队列,只需要在尾部插入一个数据,就操作尾部,不用操作整个消息队列进行读取,与操作。但是,这个消息队列不是线程安全的,我只是尽量的避免了冲突的可能性。如果消息不是非常的密集,比如几秒钟才一个,还是可以虑这样使用的。
如果你要实现线程安全的,一个建议是通过文件进行锁定,然后进行操作。下面是代码:
<div class="codetitle"><a style="cursOR: pointer" data="12231" class="copybut" id="copybut12231" onclick="doCopy('code12231')">@H_450_5@ 代码如下:

<div class="codebody" id="code12231">
class Memcache_Queue
{
private $memcache;
private $name;
private $prefix;
function construct($maxSize,$name,$memcache,$prefix = "@H_278_15@memcache_queue")
{
if ($memcache == null) {
throw new Exception("memcache object is null,new the object first.");
}
$this->memcache = $memcache;
$this->name = $name;
$this->prefix = $prefix;
$this->maxSize = $maxSize;
$this->front = 0;
$this->real = 0;
$this->size = 0;
}
function
get($Name)
{
return $this->get($Name);
}
function __set($name,$value)
{
$this->add($name,$value);
return $this;
}
function isEmpty()
{
return $this->size == 0;
}
function isFull()
{
return $this->size == $this->maxSize;
}
function enQueue($data)
{
if ($this->isFull()) {
throw new Exception("Queue is Full");
}
$this->increment("size");
$this->set($this->real,$data);
$this->set("real",($this->real + 1) % $this->maxSizE);
return $this;
}
function deQueue()
{
if ($this->isEmpty()) {
throw new Exception("Queue is Empty");
}
$this->decrement("size");
$this->delete($this->front);
$this->set("front",($this->front + 1) % $this->maxSizE);
return $this;
}
function getTop()
{
return $this->get($this->front);
}
function getAll()
{
return $this->getPage();
}
function getPage($offset = 0,$limit = 0)
{
if ($this->isEmpty() || $this->size < $offset) {
return null;
}
$keys[] = $this->getKeyByPos(($this->front + $offset) % $this->maxSizE);
$num = 1;
for ($pos = ($this->front + $offset + 1) % $this->maxSize; $pos != $this->real; $pos = ($pos + 1) % $this->maxSizE)
{
$keys[] = $this->getKeyByPos($pos);
$num++;
if ($limit > 0 && $limit == $num) {
break;
}
}
return array_values($this->memcache->get($keys));
}
function makeEmpty()
{
$keys = $this->getAllKeys();
foreach ($keys as $value) {
$this->delete($value);
}
$this->delete("real");
$this->delete("front");
$this->delete("size");
$this->delete("maxSize");
}
private function getAllKeys()
{
if ($this->isEmpty())
{
return array();
}
$keys[] = $this->getKeyByPos($this->front);
for ($pos = ($this->front + 1) % $this->maxSize; $pos != $this->real; $pos = ($pos + 1) % $this->maxSizE)
{
$keys[] = $this->getKeyByPos($pos);
}
return $keys;
}
private function add($pos,$data)
{
$this->memcache->add($this->getKeyByPos($pos),$data);
return $this;
}
private function increment($pos)
{
return $this->memcache->increment($this->getKeyByPos($pos));
}
private function decrement($pos)
{
$this->memcache->decrement($this->getKeyByPos($pos));
}
private function set($pos,$data)
{
$this->memcache->set($this->getKeyByPos($pos),$data);
return $this;
}
private function get($pos)
{
return $this->memcache->get($this->getKeyByPos($pos));
}
private function delete($pos)
{
return $this->memcache->delete($this->getKeyByPos($pos));
}
private function getKeyByPos($pos)
{
return $this->prefix . $this->name . $pos;
}
}
@H_489_149@

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