On Jul 21, 11:00 pm, Benedikt Hallinger <b.hallin...@skyforcesystems.de> wrote: > Hello, > thank you very much for the ideas. Since i will have a unknowable ammount > of Message types, extensions would be the way to go. > Your were right with the assumption that i use Java. > > The "construct and send that message" stuff is not the problem, the main > problem is, how i should parse the incoming ByteBuffer (or byte[]). > I just cant figure out how i would be able to access the packets type. > What im guesing now is, that since i will only send "Packet" messages (to > stick to the threads examples) in the future, my lib will know that it only > needs to deal with that "wrapper" type. From that i will access the payload > using the extension methods?
Right, you would parse a Packet message. > > so the decoder part will work like this: > - get byte array from wire > - parse that data with the Packet-message types builder > (mergeFrom(buffer)....) > - now we have a Packet-object with the header fields set and the payload as > extension > - extract the payload object > - push it to the appropriate handler > > But how exactly this would work with the above example? Is the "type" then > transmitted as string? The "type" is simply transmitted as a tag on the wire. The wire format of extensions is just like the wire format of a regular field - the difference is that the containing type (Packet) need not know about the extension fields in the .proto definition. Instead, each payload type that you might include will have a unique extension number. When you include one of the payload messages in your program, it will register its extensions of Packet. Then when a packet message is parsed, if it sees a tag that is not defined in the .proto but is a valid extension, it looks up the extension information and parses it appropriately. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Protocol Buffers" group. To post to this group, send email to protobuf@googlegroups.com To unsubscribe from this group, send email to protobuf+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/protobuf?hl=en -~----------~----~----~----~------~----~------~--~---
