QMF ResilientConnection notifyFd feature portability
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Key: QPID-1982
URL: https://issues.apache.org/jira/browse/QPID-1982
Project: Qpid
Issue Type: Improvement
Components: Qpid Managment Framework
Affects Versions: 0.5
Environment: Windows
Reporter: Steve Huston
The QMF's C++ qmfcommon ResilientConnection class has a setNotifyFd (int fd)
method. The docs say this can receive a file descriptor that is written on when
certain events take place, supposedly so the other end of the channel can
listen, select, etc. and be notified of some event.
This construct isn't portable, both because of the datatype of the fd (int is
not necessarily a legit handle type everywhere) and because the code assumes a
write() will work. The code can be abstracted out to get rid of the write()
easily enough, but what is the usage for this facility? There are no calls to
setNotifyFd() that I can find outside of the library containing the
implementation. So I can't tell if this is something that can be replaced by
qpid::sys::PollableCondition or not.
What is the use case for this, and how can we make this portable? Different IPC
type? Callback to some private hook?
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