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From "Chug Rolke" <cro...@redhat.com>
Subject Review Request: C++ Broker Link channel numbers may collide
Date Wed, 24 Oct 2012 19:55:45 GMT

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Review request for qpid.


Previously Link channel numbers are allocated by a simple incrementer. When the counter wrapped
then old channel numbers were blindly reused.

Now a pool of available channel numbers is kept in a RangeSet. Each bridge allocates a channel
number from the pool when it is created and returns the channel number to the pool when it
is destroyed.

Debug level messages log the allocation and freeing of channel numbers.

An exception is thrown if the pool runs empty.

This addresses bug QPID-4392.


  trunk/qpid/cpp/src/qpid/broker/Bridge.h 1400732 
  trunk/qpid/cpp/src/qpid/broker/Link.h 1400732 
  trunk/qpid/cpp/src/qpid/broker/Link.cpp 1400732 
  trunk/qpid/cpp/src/qpid/broker/LinkRegistry.cpp 1400732 

Diff: https://reviews.apache.org/r/7727/diff/


A test broker is built with a pool of only 15 (vs normal 32767) channel numbers. Simple tests
verify that 1) old code wraps and causes failures, 2) new code detects pool exhaustion, and
3) new code logs channel numbers being properly reused.

Normal self tests pass.


Chug Rolke

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