为什么不把tags作为send方法的独立的入参，而要把topic和tags融合成一个String类型的destination字段

[rainbowrain2023]

String[] tempArr = destination.split(":", 2);
String topic = tempArr[0];
String tags = "";
if (tempArr.length > 1) {
tags = tempArr[1];
}
Message rocketMsg = new Message(topic, tags, payloads);

上述代码体现你构建RocketMq的Message时的参数，由于topic和tags融合成一个String类型的destination字段，所以在需要设置tags发送时需要进行destination字段的装箱操作，这很不利于api的便捷调用

[francisoliverlee]

it comes from spring messaging def i think.

1. Abstract MessageSendingTemplate def in https://github.com/spring-projects/spring-framework/blob/main/spring-messaging/src/main/java/org/springframework/messaging/core/AbstractMessageSendingTemplate.java
2. Message interface def in https://github.com/spring-projects/spring-framework/blob/main/spring-messaging/src/main/java/org/springframework/messaging/Message.java

Message defines a message for all message queue system's message actions. not every mq has a tag.
AbstractMessageSendingTemplate defines common sendXXX method, not every mq has a tag. so common methodXXX don't define like send(topic, tag, message)