基于HTTP协议的轻量级开源简单队列服务：HTTPSQS[原创]
Redis队列——PHP操作简单示例
入队操作
<?php
$redis = new Redis();
$redis->connect('127.0.0.1',6379);
while(True){
try{
$value = 'value_'.date('Y-m-d H:i:s');
$redis->LPUSH('key1',$value);
sleep(rand()%3);
echo $value."\n";
}catch(Exception $e){
echo $e->getMessage()."\n";
}
}
?> 出队操作
<?php
$redis = new Redis();
$redis->pconnect('127.0.0.1',6379);
while(True){
try{
echo $redis->LPOP('key1')."\n";
}catch(Exception $e){
echo $e->getMessage()."\n";
}
sleep(rand()%3);
}
?>
<?php
/**
* 使用共享内存的PHP循环内存队列实现
* 支持多进程, 支持各种数据类型的存储
* 注: 完成入队或出队操作,尽快使用unset(), 以释放临界区
*
* @author wangbinandi@gmail.com
* @created 2009-12-23
*/
class SHMQueue
{
private $maxQSize = 0; // 队列最大长度 private $front = 0; // 队头指针
private $rear = 0; // 队尾指针 private $blockSize = 256; // 块的大小(byte)
private $memSize = 25600; // 最大共享内存(byte)
private $shmId = 0; private $filePtr = './shmq.ptr'; private $semId = 0;
public function __construct()
{
$shmkey = ftok(__FILE__, 't'); $this->shmId = shmop_open($shmkey, "c", 0644, $this->memSize );
$this->maxQSize = $this->memSize / $this->blockSize; // 申請一个信号量
$this->semId = sem_get($shmkey, 1);
sem_acquire($this->semId); // 申请进入临界区 $this->init();
} private function init()
{
if ( file_exists($this->filePtr) ){
$contents = file_get_contents($this->filePtr);
$data = explode( '|', $contents );
if ( isset($data[0]) && isset($data[1])){
$this->front = (int)$data[0];
$this->rear = (int)$data[1];
}
}
} public function getLength()
{
return (($this->rear - $this->front + $this->memSize) % ($this->memSize) )/$this->blockSize;
} public function enQueue( $value )
{
if ( $this->ptrInc($this->rear) == $this->front ){ // 队满
return false;
} $data = $this->encode($value);
shmop_write($this->shmId, $data, $this->rear );
$this->rear = $this->ptrInc($this->rear);
return true;
} public function deQueue()
{
if ( $this->front == $this->rear ){ // 队空
return false;
}
$value = shmop_read($this->shmId, $this->front, $this->blockSize-1);
$this->front = $this->ptrInc($this->front);
return $this->decode($value);
} private function ptrInc( $ptr )
{
return ($ptr + $this->blockSize) % ($this->memSize);
} private function encode( $value )
{
$data = serialize($value) . "__eof";
if ( strlen($data) > $this->blockSize -1 ){
throw new Exception(strlen($data)." is overload block size!");
}
return $data;
} private function decode( $value )
{
$data = explode("__eof", $value);
return unserialize($data[0]);
} public function __destruct()
{
$data = $this->front . '|' . $this->rear;
file_put_contents($this->filePtr, $data); sem_release($this->semId); // 出临界区, 释放信号量
}
} 使用的样例代码如下:
// 进队操作
$shmq = new SHMQueue();
$data = 'test data';
$shmq->enQueue($data);
unset($shmq);
// 出队操作
$shmq = new SHMQueue();
$data = $shmq->deQueue();
unset($shmq);