[GitHub] [apisix] bzp2010 commented on a diff in pull request #7059: docs: add pubsub develop example for kafka

[GitBox <gi...@apache.org>]

bzp2010 commented on code in PR #7059:
URL: https://github.com/apache/apisix/pull/7059#discussion_r874502513


##########
docs/en/latest/pubsub.md:
##########
@@ -58,6 +58,192 @@ Apache APISIX implement an extensible pubsub module, which is responsible for st
 - Implement the required message system instruction processing functions
 - Optional: Create plugins to support advanced configurations of this messaging system
 
-### Example
+### Example of Apache Kafka
 
-TODO, an example will be added later to point out how to support other messaging systems.
+#### Add new commands and response body definitions to `pubsub.proto`
+
+The core of the protocol definition in `pubsub.proto` is the two parts `PubSubReq` and `PubSubResp`.
+
+First, create the `CmdKafkaFetch` command and add the required parameters. Then, register this command in the list of commands for `req` in `PubSubReq`, which is named `cmd_kafka_fetch`.
+
+```protobuf
+message CmdKafkaFetch {
+    string topic = 1;
+    int32 partition = 2;
+    int64 offset = 3;
+}
+
+message PubSubReq {
+    int64 sequence = 1;
+    oneof req {
+        CmdKafkaFetch cmd_kafka_fetch = 31;

Review Comment:
   updated to source file link



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