在PHP的STOMP消息中,设置消息优先级可以通过在消息头(headers)中添加priority
字段来实现。优先级值的范围是1到9,其中1表示最高优先级,9表示最低优先级。以下是一个使用php-stomp库发送优先级消息的示例:
首先,确保已经安装了php-stomp库。如果没有安装,可以使用Composer进行安装:
composer require cboden/ratchet-stomp
然后,创建一个发送优先级消息的示例:
<?php
require 'vendor/autoload.php';
use Ratchet\Client\WebSocket;
use Ratchet\MessageComponentInterface;
use Ratchet\ConnectionInterface;
use Stomp\Client as StompClient;
use Stomp\Protocol\Frame;
class MyStompClient implements MessageComponentInterface {
protected $stompClient;
public function __construct() {
$this->connect();
}
public function connect() {
$this->stompClient = new StompClient('tcp://localhost:61613');
$this->stompClient->connect();
}
public function onOpen(ConnectionInterface $conn) {
echo "Connected to STOMP server\n";
}
public function onClose(ConnectionInterface $conn) {
echo "Disconnected from STOMP server\n";
}
public function onError(ConnectionInterface $conn, \Exception $e) {
echo "Error: {$e->getMessage()}\n";
}
public function onMessage(ConnectionInterface $from, $msg) {
echo "Received message: {$msg}\n";
}
public function sendPriorityMessage($queue, $message, $priority = 1) {
$headers = [
'priority' => $priority,
];
$this->stompClient->send("/queue/{$queue}", $message, $headers);
}
}
$client = new MyStompClient();
$client->sendPriorityMessage('my_queue', 'Hello, World!', 9);
在这个示例中,我们创建了一个名为MyStompClient
的类,它实现了MessageComponentInterface
接口。我们使用StompClient
类连接到STOMP服务器,并通过sendPriorityMessage
方法发送优先级消息。在sendPriorityMessage
方法中,我们通过设置priority
头来指定消息的优先级。