How to use Physical replication API to parse Wal record stream?

[ifangta]

I want read WAL stream by jdbc Physical replication API，and I have get the WAL data stream ByteBuffer ,also i have parse XlogData from ByteBuffer ,when i parse WAL record FROM byteBuffer ,I find that idon't know how to parse the wal record .

Anybody can help me?

[davecramer]

You would have to look up the source code for the backend. This is not a public API so they can change it from version to version. Not sure why you want Physical Replication API?

[ifangta]

Thank you for your reply!
Because physical replication can contain many important data , it do not require a replication slot，and it can use any lsn that has exist for Replication.

Do you know the WAL record structure？，or have anyother suggest.

Thank you！

List:
XLogData (B)
Byte1('w')
Identifies the message as WAL data.
Int64
The starting point of the WAL data in this message.
Frontend/Backend Protocol
Int64
The current end of WAL on the server.
Int64
The server's system clock at the time of transmission, as microseconds since midnight
on 2000-01-01.
Byten
A section of the WAL data stream.
A single WAL record is never split across two XLogData messages. When a WAL record
crosses a WAL page boundary, and is therefore already split using continuation records,
it can be split at the page boundary. In other words, the first main

[davecramer]

Sorry, you will have to use the C source code to figure this out

[ifangta]

thank you very much ,i will first to use the Logic Replication Api, and ,try to read C source code to parse the WAL record stream。

if you have good idea,please tell me。thank you!