Re: Data Dictionary Developer Questions [I]
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Thank you very much for your answers, Matthew!
From: Matthew Mulhern [mailto:MMulhern@...]
Sent: Wednesday, February 06, 2013 9:54 AM
To: openmama-users@...; Joseph Sarbak
Subject: RE:[Openmama-users] Data Dictionary Developer Questions [I]
Addressing each of your points in turn:
0. The default OpenMama topic model is the concatenation of 'namespace'##'symbol'. Can OpenMama support multiple symbols published over a single topic? Would there be any complications (on the caching mechanism, for example) if a group topic model were followed?
OpenMAMA has the concept of group subscriptions, where multiple symbols are sent down a single subscription. It¹s a different subscription type on the client side.
The publisher needs to send an initial for each symbol within the group before the 10 second timeout elapses.
The specific symbol within the group is communicated using the wIssueSymbol reserved field.
Each symbol has a separate context and has its own sequence numbers and gap detection.
1. Data Dictionary API: Can one enrish the standard field description with user-defined fields? Example custom fields would be: custom data-types, and byte-offset?
Yes, there is a dedicated range for adding your own custom fields.
However the types available in the dictionary may be a lot less strict than the payload. Generally the dictionary is used for Name/fid mapping.
2. Data Dictionary API: Is there java support? Is there a plan for supporting java?
There is a MamaDIctionary in JAVA currently. However it relies on populating from a file or a msg.
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