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.



Rgds,
Matt Mulhern

On 04/02/2013 19:30, "Joseph Sarbak" <joseph.sarbak@...> wrote:

Classification: For internal use only

Dear openmama-users@...,

For my employer, I am investigating the work required to publish market
data to internal consumers over the OpenMama API. I have a couple
questions regarding the default mama topic model and the data dictionary
api. I would be very grateful if someone could either answer these
questions or indicate whether I should be asking another mailing list.


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?

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?

2. Data Dictionary API: Is there java support? Is there a plan for
supporting java?

Thank you.

Joseph Sarbak


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