有关beanstalkd的基本概念，编译和yum的安装方法已经在上篇文章《beanstalkd消息/任务队列的详解》中介绍了，今天练习下php使用beanstalkd的过程，我选择的是使用pheanstalk类来连接beanstalkd
1.使用Composer安装Pheanstalk
composer require pda/pheanstalk
2.实现代码
php查看beanstalkd状态脚本Status.php
<?php
/**
* Created by PhpStorm.
* User: jmsite.cn
* Date: 2019/1/21
* Time: 10:32
*/
require "../vendor/autoload.php";
use Pheanstalk\Pheanstalk;
$pheanstalk = new Pheanstalk('192.168.75.135',11300);
print_r($pheanstalk->stats());生产者代码Producter.php
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<?php
/**
* Created by PhpStorm.
* User: jmsite.cn
* Date: 2019/1/20
* Time: 16:30
*/
require "../vendor/autoload.php";
use Pheanstalk\Pheanstalk;
$pheanstalk = new Pheanstalk('192.168.75.135',11300);
for ($i=0;$i<50;$i++){
$data = array(
'key' => 'testkey'.$i,
'value' => 'testvalue',
'time' => time(),
);
$ret = $pheanstalk->putInTube('test-tube', json_encode($data), Pheanstalk::DEFAULT_PRIORITY, Pheanstalk::DEFAULT_DELAY, Pheanstalk::DEFAULT_TTR);
var_dump($ret);
}消费者代码Consumer.php
<?php
/**
* Created by PhpStorm.
* User: jmsite.cn
* Date: 2019/1/20
* Time: 16:31
*/
set_time_limit(0);
ini_set('default_socket_timeout', 900);
require "../vendor/autoload.php";
use Pheanstalk\Pheanstalk;
$pheanstalk = new Pheanstalk('192.168.75.135',11300);
while (true){
$job = $pheanstalk
->watch('test-tube')
->ignore('default')
->reserve();
if ($job){
sleep(2);
echo $job->getData();
echo "\n";
$pheanstalk->delete($job);
}
}打开命令行/终端窗口，执行生产者，会向tube写入50条任务
PS E:\repository\work\beanstalk> php .\Producter.php int(101) int(102) int(103) int(104) int(105) int(106) int(107) int(108) int(109) int(110) int(111) int(112) int(113) int(114) ......
由此可见，$pheanstalk->putInTube成功后返回的是job的id
查看状态
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PS E:\repository\work\beanstalk> php Status.php
Pheanstalk\Response\ArrayResponse Object
(
[_name:Pheanstalk\Response\ArrayResponse:private] => OK
[storage:ArrayObject:private] => Array
(
[current-jobs-urgent] => 0
[current-jobs-ready] => 50
[current-jobs-reserved] => 0
[current-jobs-delayed] => 0
[current-jobs-buried] => 0
......结果中显示处于ready待读取状态的job是50个
打开两个或以上命令行/终端窗口，执行消费者，模拟多消费者竞争
消费者1
PS E:\repository\work\beanstalk> php .\Consumer.php
{"key":"testkey0","value":"testvalue","time":1548039103}
{"key":"testkey1","value":"testvalue","time":1548039103}
{"key":"testkey2","value":"testvalue","time":1548039103}
{"key":"testkey4","value":"testvalue","time":1548039103}
{"key":"testkey6","value":"testvalue","time":1548039103}
{"key":"testkey8","value":"testvalue","time":1548039103}
{"key":"testkey10","value":"testvalue","time":1548039103}
{"key":"testkey12","value":"testvalue","time":1548039103}
{"key":"testkey14","value":"testvalue","time":1548039103}
{"key":"testkey16","value":"testvalue","time":1548039103}
{"key":"testkey18","value":"testvalue","time":1548039103}
{"key":"testkey20","value":"testvalue","time":1548039103}
{"key":"testkey22","value":"testvalue","time":1548039103}
{"key":"testkey24","value":"testvalue","time":1548039103}
{"key":"testkey26","value":"testvalue","time":1548039103}
{"key":"testkey28","value":"testvalue","time":1548039103}
{"key":"testkey30","value":"testvalue","time":1548039103}
{"key":"testkey32","value":"testvalue","time":1548039103}
{"key":"testkey34","value":"testvalue","time":1548039103}
{"key":"testkey36","value":"testvalue","time":1548039103}
{"key":"testkey38","value":"testvalue","time":1548039103}
{"key":"testkey40","value":"testvalue","time":1548039103}
{"key":"testkey42","value":"testvalue","time":1548039103}
{"key":"testkey44","value":"testvalue","time":1548039103}
{"key":"testkey46","value":"testvalue","time":1548039103}
{"key":"testkey48","value":"testvalue","time":1548039103}消费者2
PS E:\repository\work\beanstalk> php .\Consumer.php
{"key":"testkey3","value":"testvalue","time":1548039103}
{"key":"testkey5","value":"testvalue","time":1548039103}
{"key":"testkey7","value":"testvalue","time":1548039103}
{"key":"testkey9","value":"testvalue","time":1548039103}
{"key":"testkey11","value":"testvalue","time":1548039103}
{"key":"testkey13","value":"testvalue","time":1548039103}
{"key":"testkey15","value":"testvalue","time":1548039103}
{"key":"testkey17","value":"testvalue","time":1548039103}
{"key":"testkey19","value":"testvalue","time":1548039103}
{"key":"testkey21","value":"testvalue","time":1548039103}
{"key":"testkey23","value":"testvalue","time":1548039103}
{"key":"testkey25","value":"testvalue","time":1548039103}
{"key":"testkey27","value":"testvalue","time":1548039103}
{"key":"testkey29","value":"testvalue","time":1548039103}
{"key":"testkey31","value":"testvalue","time":1548039103}
{"key":"testkey33","value":"testvalue","time":1548039103}
{"key":"testkey35","value":"testvalue","time":1548039103}
{"key":"testkey37","value":"testvalue","time":1548039103}
{"key":"testkey39","value":"testvalue","time":1548039103}
{"key":"testkey41","value":"testvalue","time":1548039103}
{"key":"testkey43","value":"testvalue","time":1548039103}
{"key":"testkey45","value":"testvalue","time":1548039103}
{"key":"testkey47","value":"testvalue","time":1548039103}
{"key":"testkey49","value":"testvalue","time":1548039103}两个消费者竞争着完成了全部任务，由于我的beanstalkd启动时开启了binlog持久，所以beanstalkd重启后任务也不会丢失
3.需要注意的事项
1.创建job时，设置的超时时间Pheanstalk::DEFAULT_TTR一定要比消费者处理一个job的时间要长，否则job在超时之后会被tube更改为ready状态，被其他消费者获取，而此时当前消费者还在处理该job，这就出现了一个job被多个消费者重复执行的可怕现象
2.Pheanstalk的维护者发生了变化，在新版的Pheanstalk中是不支持长连接的，当客户端socket连接服务器时间超过php.ini中设置的default_socket_timeout时，如果未能从服务端tube获得job，连接将会被断开，所以消费者进程需要维护，以便在退出后可以重新开启进程，推荐使用supervisord维护消费者进程。
判断socket超时的代码
public function getLine($length = null)
{
$timeout = ini_get('default_socket_timeout');
$timer = microtime(true);
do {
$data = isset($length) ?
$this->_wrapper()->fgets($this->_socket, $length) :
$this->_wrapper()->fgets($this->_socket);
if ($this->_wrapper()->feof($this->_socket)) {
throw new Exception\SocketException('Socket closed by server!');
}
if (($data === false) && microtime(true) - $timer > $timeout) {
$this->disconnect();
throw new Exception\SocketException('Socket timed out!');
}
} while ($data === false);
return rtrim($data);
} 
