指定主题时使用直接交换的RabbitMQ

Question

在我的应用程序中，我有3个类:< br> - Company，它为3项工作中的任何一项雇用工人< br> - Workers，每个人可以做2项工作< br> - Administrator，它接收程序中所有消息的副本，并可以向所有公司、所有工人或每个人发送消息

我使用< code > work . companies . company name 作为公司密钥，使用< code > work . workers . worker name 作为工人密钥，它们都使用默认的交换和队列进行通信。管理员通过< code>admin主题交换接收消息。

问题出在管理员身上 -

public class Administrator
{
    public static void main(String[] args) throws IOException, TimeoutException
    {
        new Thread(new TopicListener("admin", ign -> {})).start();
        TopicWriter writer = new TopicWriter();
    // lots of code

TopicListener.java：

public class TopicListener implements Runnable
{
    private final String EXCHANGE_NAME = "space";
    private String key;
    private Consumer<String> msgHandler;

    public TopicListener(String key, Consumer<String> msgHandler)
    {
        this.key = key;
        this.msgHandler = msgHandler;
    }

    @Override
    public void run()
    {
        try
        {
            ConnectionFactory factory = new ConnectionFactory();
            factory.setHost("localhost");
            Connection connection = factory.newConnection();
            Channel channel = connection.createChannel();

            channel.exchangeDeclare(EXCHANGE_NAME, "topic");

            String queueName = channel.queueDeclare().getQueue();
            channel.queueBind(queueName, EXCHANGE_NAME, key);

            com.rabbitmq.client.Consumer consumer = new DefaultConsumer(channel)
            {
                @Override
                public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body)
                {
                    String msg = new String(body, StandardCharsets.UTF_8);
                    System.out.println("Received: \"" + msg + "\"");
                    msgHandler.accept(msg);
                }
            };

            channel.basicConsume(queueName, true, consumer);
        }
        catch (IOException | TimeoutException e)
        { e.printStackTrace(); }
    }
}

TopicWriter.java：

public class TopicWriter
{
    private final String EXCHANGE_NAME = "space";
    private final Channel channel;

    public TopicWriter() throws IOException, TimeoutException
    {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        Connection connection = factory.newConnection();
        this.channel = connection.createChannel();

        channel.exchangeDeclare(EXCHANGE_NAME, "topic");
    }

    public void send(String msg, String key) throws IOException
    {
        channel.basicPublish(
                EXCHANGE_NAME,
                key,
                null,
                msg.getBytes(StandardCharsets.UTF_8));
    }
}

Company.java包含:

new Thread(new TopicListener("space.agencies." + agencyID, ign -> {})).start();

Worker.java包含：

new Thread(new TopicListener("space.carriers." + carrierID, consumer)).start();

Answer 1

我发现了问题所在:我试图用Topic给每个人发送消息，在RabbitMQ中，Topic用于指定谁应该接收消息。应该在队列键声明中使用“#”或“*”，而不是在发送带有给定键的消息时使用。