Redis消息队列

在Magento中利用redis做消息队列

首先在配置文件中配置好redis的相关信息：

<config>
    <global>
        <redis_queue>
            <host>127.0.0.1</host>
            <port>6379</port>
            <db>3</db>
        </redis_queue>
    </global>
</config>

消息队列的核心消息发送和取出：

private $_queueName = 'queue';

public function __construct($queueName)
{
    if($queueName){
        $this->_queueName .= '_'.$queueName;
    }
}

public function send($method, $params = [], $delay = false)
{
    if (!is_array($params)) {
        Mage::throwException('Params must be an array');
    }

    //拼出消息
    $message = [];
    $message['method'] = $method;
    $message['params'] = $params;
    $message = json_encode($message);

    try {
    //从配置文件中取出Redis信息
        $options = Mage::getConfig()->getNode('global/redis_queue')->asArray();
        $options['delay'] = 0;

        if ($delay === true) {
            $options['delay'] = 1;
        }

        $options['queue_name'] = $this->_queueName;

        //将整理好的信息带到Queue/Adapter/Redis文件下的构造方法中
        $adapter = Mage::getModel('queue/adapter_redis', $options);

        //将整理的信息放入到消息队列中
        $adapter->send($message);
    } catch (Exception $e) {
        Mage::logException($e);
        Mage::log('队列发送失败', null, 'queueException.log');
    }
}

public function receive($delay = false)
{
    //从配置文件中取出Redis信息
    $options = Mage::getConfig()->getNode('global/redis_queue')->asArray();
    $options['delay'] = 0;

    if ($delay === true) {
        $options['delay'] = 1;
    }

    $options['qu    eue_name'] = $this->_queueName;

    //将整理好的信息带到Queue/Adapter/Redis文件下的构造方法中
    $adapter = Mage::getModel('queue/adapter_redis', $options);

    //将redis消息队列中存入的信息取出
    $msgs = $adapter->receive();

    return $msgs;
}

const DEFAULT_RECEIVE_TIMEOUT = 30;
const DEFAULT_QUEUE_KEY = 'queue';

private $_client = null;
private $_queue_key = self::DEFAULT_QUEUE_KEY;

//由上一个方法调用时带过来的redis信息在构造函数中做处理
public function __construct($options)
{
    if(!$this->_client){
        $host = $options['host'];
        $port = $options['port'];
        $db = $options['db'];
        $this->_client = new Credis_Client($host, $port);
        $this->_client->select($db);
    }

    $queue_name = $options['queue_name'];
    $this->_queue_key = $queue_name;
    if($options['delay']){
        $this->_queue_key = $queue_name.'_delay';
    }

    return $this->_client;
}


public function send($message)
{
    //将消息从左送入到redis消息队列中
    $this->_client->lPush($this->_queue_key, $message);
}

// 删除，并获得该列表中的最后一个元素，或阻塞，直到有一个可用
public function receive($maxMessages = null, $timeout = null)
{
    if ($maxMessages === null) {
        $maxMessages = 1;
    }

    if ($timeout === null) {
        $timeout = self::DEFAULT_RECEIVE_TIMEOUT;
    }

//从php.ini文件取出配置'default_socket_timeout'的值
    $socket_timeout = ini_get('default_socket_timeout');
    if($timeout >= $socket_timeout) {
        $timeout = $socket_timeout - 2;
    }

    $msgs = [];
    if ($maxMessages > 0 ) {
        for ($i = 0; $i < $maxMessages; $i++) {
        //将消息队列从右侧取出
            $msgs[] = $this->_client->brPop($this->_queue_key, $timeout);
        }
    }

    return $msgs;
}