在PHP中如何使用消息列队

/**
 * 消息列队服务
 * @author zhou.tingze
 * @example
 * -----------------------------------Create----------------------------------------
 * $array = array('a','b','c','d');
 * $this->load->library('amqp_service');
 * $this->amqp_service->setSaveType('test_exchange', 'test_queue', 'test_router');
 * $this->amqp_service->createMessageQueue($array);
 * -----------------------------------End-------------------------------------------
 *
 * -----------------------------------Get-------------------------------------------
 * $this->load->library('amqp_service');
 * $this->amqp_service->setSaveType('test_exchange', 'test_queue', 'test_router');
 * $message_queue = $this->amqp_service->getMessageQueue();
 * var_dump($message_queue)
 * -----------------------------------End-------------------------------------------
 */

class Amqp_service extends Base_service{

	public $conn;
	public $exchange;
	public $queue;
	public $router;

    function __construct(){
        parent:: __construct();

        //获取系统配置
        $this->load->config('app_config', TRUE);
        $app_config = $this->config->item('app_config');

        $this->connect($app_config['amqp']);
    }

    /**
     *
     * 尝试连接Amqp服务
     */
    private function connect($amqp_args)
    {
    	$this->conn = new AMQPConnection($amqp_args);
		$this->conn->connect();

		if (!$this->conn->isConnected())
		{
			throw new Exception('Cannot connect to the broker.');
		}
    }

    /**
     *
     * 设定消息列队保存方式
     * @param String $exchange_name 交换机名
     * @param String $queue_name    消息列队名
     * @param String $router_name   路由名
     */
    public function setSaveType($exchange_name, $queue_name, $router_name)
    {
    	$this->exchange = $exchange_name;
    	$this->queue    = $queue_name;
    	$this->router   = $router_name;
    }

    /**
     *
     * 创建消息列队
     * @param Array $array
     */
    public function createMessageQueue($array)
    {
    	//创建交换机
		$channel = new AMQPChannel($this->conn);
		$ex      = new AMQPExchange($channel);

		//交换机名
		$ex->setName($this->exchange);
		$ex->setType(AMQP_EX_TYPE_DIRECT);
		$ex->setFlags(AMQP_DURABLE | AMQP_AUTODELETE);
		$ex->declare();

		//创建消息列队
		$q = new AMQPQueue($channel);

		//队列名
		$q->setName($this->queue);
		$q->setFlags(AMQP_DURABLE | AMQP_AUTODELETE);
		$q->declare();

		//绑定交换机与队列，并指定路由键
		$q->bind($this->exchange, $this->router);

		//消息发布
		$channel->startTransaction();
		$message = json_encode($array);
		$ex->publish($message, $this->router);
		$channel->commitTransaction();

		//$this->conn->disconnect();
    }

    /**
     *
     * 获取消息列队
     */
    public function getMessageQueue()
    {
    	try
    	{
	    	//设置queue名称，使用exchange，绑定routingkey
			$channel = new AMQPChannel($this->conn);
			$q       = new AMQPQueue($channel);

			$q->setName($this->queue);
			$q->setFlags(AMQP_DURABLE | AMQP_AUTODELETE);
			$q->declare();
			$q->bind($this->exchange, $this->router);   

			//消息获取
			$messages = $q->get(AMQP_AUTOACK) ;

			$arr = array();
			if ($messages){
				$arr = json_decode($messages->getBody(), true );
			}
    	}catch (Exception $e){
    		throw new Exception($e->getMessage());
    	}
		//$this->conn->disconnect();

		return $arr;
    }

    /*
    public function getAllMessageQueue()
    {
		//设置queue名称，使用exchange，绑定routingkey
		$channel = new AMQPChannel($this->conn);
		$q       = new AMQPQueue($channel);

		$q->setName($this->queue);
		$q->setFlags(AMQP_DURABLE | AMQP_AUTODELETE);
		$q->declare();
		$q->bind($this->exchange, $this->router);
		$this->conn->disconnect();

		//阻塞模式获取消息列队
		while(True){
		    $q->consume('processMessage');
		    //$q->consume('processMessage', AMQP_AUTOACK); //自动ACK应答
		}
    }
    */

    public function __destruct()
    {
    	$this->conn->disconnect();
    }
}

/**
 * 消费回调函数
 * 处理消息
 * @param Object $envelope
 * @param Object $queue
 */
/*
function processMessage($envelope, $queue) {
    $msg = $envelope->getBody();
    echo $msg . '<br />';

    //手动发送ACK应答
    $queue->ack($envelope->getDeliveryTag());
}
*/