Durablilty of federation config, other miscellaneous fixes
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Key: QPID-1050
URL: https://issues.apache.org/jira/browse/QPID-1050
Project: Qpid
Issue Type: New Feature
Components: C++ Broker
Affects Versions: M3
Reporter: Ted Ross
The attached patch contains the following changes:
1) Durability for federation links (broker-to-broker connections)
2) Improved handling of federation links:
a) Links can be created even if the remote broker is not reachable
b) If links are lost, re-establishment will occur using an exponential
back-off algorithm
3) Durability of exchanges is now viewable through management
4) ManagementAgent API has been moved to an interface class to reduce coupling
between the broker and manageable plug-ins.
5) General configuration storage capability has been added to the store/recover
interface. This is used for federation links.
6) Management object-ids for durable objects are now themselves durable.
Special note:
To support the new federation features, it was necessary to create a new class
called ProtocolAccess. This class is used to consolidate linkage between
previously unlinked objects in the architecture. For example, federation link
objects need to know when TCP connections are lost and they need access to
Connection objects so that bridge configuration can be managed.
Since "management plane" logic needs access to a wide variety of operational
objects, ProtocolAccess was introduced. ProtocolAccess isolates in one place
the "controversial" architectural linkages needed for federation. If, through
team review, it is decided in the future to use a different architecture,
ProtocolAccess can easily be removed and replaced.
Features still missing:
In the interest of getting these changes submitted, I have left out several
necessary features. These can be added after a few more hours worth of work.
1) Durability for federation "Bridge" configuration
2) Link management in the qpid-route utility (i.e. the ability to view link
status and troubleshoot connectivity issues)
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