remove ceph code

[stor4nfv.git] / src / ceph / doc / dev / context.rst

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-=============
- CephContext
-=============
-
-A CephContext represents a single view of the Ceph cluster. It comes complete
-with a configuration, a set of performance counters (PerfCounters), and a
-heartbeat map. You can find more information about CephContext in
-src/common/ceph_context.h.
-
-Generally, you will have only one CephContext in your application, called
-g_ceph_context. However, in library code, it is possible that the library user
-will initialize multiple CephContexts. For example, this would happen if he
-called rados_create more than once.
-
-A ceph context is required to issue log messages. Why is this? Well, without
-the CephContext, we would not know which log messages were disabled and which
-were enabled.  The dout() macro implicitly references g_ceph_context, so it
-can't be used in library code.  It is fine to use dout and derr in daemons, but
-in library code, you must use ldout and lderr, and pass in your own CephContext
-object. The compiler will enforce this restriction.