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diff --git a/doc/rados/api/objclass-sdk.rst b/doc/rados/api/objclass-sdk.rst new file mode 100644 index 000000000..6b1162fd4 --- /dev/null +++ b/doc/rados/api/objclass-sdk.rst @@ -0,0 +1,37 @@ +=========================== +SDK for Ceph Object Classes +=========================== + +`Ceph` can be extended by creating shared object classes called `Ceph Object +Classes`. The existing framework to build these object classes has dependencies +on the internal functionality of `Ceph`, which restricts users to build object +classes within the tree. The aim of this project is to create an independent +object class interface, which can be used to build object classes outside the +`Ceph` tree. This allows us to have two types of object classes, 1) those that +have in-tree dependencies and reside in the tree and 2) those that can make use +of the `Ceph Object Class SDK framework` and can be built outside of the `Ceph` +tree because they do not depend on any internal implementation of `Ceph`. This +project decouples object class development from Ceph and encourages creation +and distribution of object classes as packages. + +In order to demonstrate the use of this framework, we have provided an example +called ``cls_sdk``, which is a very simple object class that makes use of the +SDK framework. This object class resides in the ``src/cls`` directory. + +Installing objclass.h +--------------------- + +The object class interface that enables out-of-tree development of object +classes resides in ``src/include/rados/`` and gets installed with `Ceph` +installation. After running ``make install``, you should be able to see it +in ``<prefix>/include/rados``. :: + + ls /usr/local/include/rados + +Using the SDK example +--------------------- + +The ``cls_sdk`` object class resides in ``src/cls/sdk/``. This gets built and +loaded into Ceph, with the Ceph build process. You can run the +``ceph_test_cls_sdk`` unittest, which resides in ``src/test/cls_sdk/``, +to test this class. |