[This message was posted by Hei Chan of N/A <[email protected]> to the "FAST Protocol" discussion forum at http://fixprotocol.org/discuss/46. You can reply to it on-line at http://fixprotocol.org/discuss/read/7b428f5e - PLEASE DO NOT REPLY BY MAIL.]
Thanks for your quick reply! > Hi, > > Frame length is a feature that must be agreed on bi-laterally. There is > nothing in the wire data that tells you it is there and it is currently > not used in any impl as far as I know. > > Frame length is optional and it was included in the std to simplify > parsing for those who wanted to build a more naive FAST decoder over > TCP. Depending on how you implement your decoder you may or may not have > use for a frame length. A side-effect of using the frame length > construct is that you can skip over a message that you don't recognize. > > This is not without complications as you must make sure that the > previous value state for your field encoding operations remain intact. > So, even if you don't know how to decode the message you have to know > that there are no dependencies to messages that you do know and > therefore can parse. > > The rules and best practices around frame length are still somewhat > untested, so proceed with caution. > > I recommend that you don't use frame length unless you believe you have > a strong reason to use it. > > HTH, Rolf > > > Hi, > > > > I read http://www.fixprotocol.org/documents/2301/A%20Basic%20Guide%20to- > > %20FAST%20v1.0.pdf. > > > > I am confused about the frame length field mentioned on page 17. > > > > I am sending an encoded message over TCP (socket). So do I need to > > prefix the message with the length of the message? > > > > If yes, how does the receiver know that it is a new message (given > > that date transferred over TCP is just a byte stream)? > > > > If it has been asked, please give me a pointer. (A little bit hard to > > use the search function here...:() > > > > Thanks in advance! [You can unsubscribe from this discussion group by sending a message to mailto:[email protected]]
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