在Aeron MQ中,可以通过创建多个订阅来实现多个订阅的功能。以下是使用Java代码示例的解决方法:
Aeron.Context ctx = new Aeron.Context();
try (Aeron aeron = Aeron.connect(ctx)) {
    String channel = "aeron:udp?endpoint=localhost:40123";
    int streamId1 = 1;
    int streamId2 = 2;
    // 创建第一个订阅
    Subscription subscription1 = aeron.addSubscription(channel, streamId1);
    // 创建第二个订阅
    Subscription subscription2 = aeron.addSubscription(channel, streamId2);
    // 创建发布者
    Publication publication = aeron.addPublication(channel, streamId1);
    // 使用发布者发送消息
    String message = "Hello, Aeron!";
    byte[] messageBytes = message.getBytes();
    UnsafeBuffer buffer = new UnsafeBuffer(messageBytes);
    long result = publication.offer(buffer, 0, messageBytes.length);
    if (result < 0) {
        System.out.println("Failed to send message");
    } else {
        System.out.println("Message sent successfully");
    }
    // 从第一个订阅接收消息
    Image image1 = subscription1.imageAtIndex(0);
    FragmentAssembler fragmentAssembler1 = new FragmentAssembler((buffer, offset, length, header) -> {
        byte[] data = new byte[length];
        buffer.getBytes(offset, data);
        String receivedMessage = new String(data);
        System.out.println("Received message from subscription1: " + receivedMessage);
    });
    while (image1.poll(fragmentAssembler1, 10) > 0) {
        // 接收消息
    }
    // 从第二个订阅接收消息
    Image image2 = subscription2.imageAtIndex(0);
    FragmentAssembler fragmentAssembler2 = new FragmentAssembler((buffer, offset, length, header) -> {
        byte[] data = new byte[length];
        buffer.getBytes(offset, data);
        String receivedMessage = new String(data);
        System.out.println("Received message from subscription2: " + receivedMessage);
    });
    while (image2.poll(fragmentAssembler2, 10) > 0) {
        // 接收消息
    }
}
在上述示例中,我们创建了一个发布者和两个订阅者。发布者使用Publication对象发送消息,两个订阅者使用Subscription对象接收消息。FragmentAssembler用于处理接收到的消息。在循环中,我们使用poll()方法来接收消息。
请注意,上述示例中的channel和streamId可以根据实际情况进行修改,以便适应您的应用程序需求。