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。