Implementation of the JMS specification and API
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Key: BOOKKEEPER-25
URL: https://issues.apache.org/jira/browse/BOOKKEEPER-25
Project: Bookkeeper
Issue Type: Task
Reporter: Matthieu Morel
Here is a proposal for implementing JMS on top of Hedwig.
Overview:
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After comparing the JMS spec and Hedwig's current implementation, it appears
that Hedwig provides most concepts of the JMS spec. The work will therefore
mostly be implementing wrappers around Hedwig's primitives.
There is no 1 to 1 mapping most of the time though, and there are some
subtleties in the JMS spec that we must be cautious about. There are also
things that don't exist in Hedwig and that we'll have to add.
For instance, "administered objects", the different kinds of standard messages,
or a parser for the SQL-like selector queries. These are marked with a
triangular flag on the attached mindmap.
The JMS spec also specifies support for distributed transactions (XA) but this
part is optional. I would suggest to leave that for later, if there is any
request for it.
Design:
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I suggest to separate all JMS-related code in a separate project (as
hedwig-client and hedwig-protocol).
We'll therefore make sure that Hedwig-server is JMS agnostic, and it will later
be possible to use the same approach for implementing AMQP or JMS2, without
mixing all concepts.
Development:
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An iterative approach is well suited. We could start with fundamentals, and
progressively add some meat:
1. messages, connections and sessions
2. basic messaging with selectors
3. all cases of messaging models
4. validation tests
5. performance tests (I checked and unfortunately, there does not seem to be
any "free" standard for benchmarking jms implementation...)
Each iteration would involve adding regression tests and doing a review.
About the time this would take:
My rough estimation (not being very familiar with Hedwig's codebase): in the
order 1 or 2 weeks for each of these iterations.
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