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Add Message Routing section to docs

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pull/35/head
David Wilson 7 years ago
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52
docs/howitworks.rst
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@ -395,6 +395,58 @@ presence of many machines, and would require manually splitting up the parts of
Twisted that we would like to use.
Message Routing
---------------
At present routing is very simple, and assumes that it is impossible for a tree
of contexts to be constructed such that at least one of a context's indirect
parents will not know the ID of a target the context is attempting to
communicate with.
When :py:class:`econtext.core.Router` receives a message, it first checks the
IDs associated with its directly connected streams for a potential route for
the message. If one of the streams matches, either because the stream directly
connects to the target ID, or the master has sent an ``ADD_ROUTE`` message
associating that stream with the target ID, then the message will be forwarded
down the tree using that stream.
If the message does not match any ``ADD_ROUTE`` message or directly connected
stream, instead it is forwarded upstream, first to the context's parent, and
recursively by the each parent context in turn, until some tree node is reached
that knows how to forward the message back down the tree.
When the master establishes a new context via an existing child context, it
takes care to send corresponding ``ADD_ROUTE`` messages to each indirect parent
up the tree.
Example
#######
.. image:: images/context-tree.png
In the diagram, when ``master`` is establishing a connection to
``sudo:node12b:webapp``, it must send ``ADD_ROUTE`` messages to ``rack12``,
``dc1``, and ``bastion``; `node12b` does not require an ``ADD_ROUTE`` message
since it has a stream directly connected to the new context.
When ``sudo:node22a:webapp`` wants to send a message to
``sudo:node12b:webapp``, the message will be routed as follows:
``sudo:node22a:webapp -> node22a -> rack22 -> dc2 -> bastion -> dc1 -> rack12 -> node12b -> sudo:node12b:webapp``
.. image:: images/route.png
Future
######
The current routing approach is incomplete, since routes to downstream contexts
are not propagated upwards when a descendant of the master context establishes
a new child context, but that is okay for now, since child contexts cannot
currently allocate new context IDs anyway.
Differences Between Master And Slave Brokers
############################################

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