defines an AbstractComputeBackend type

Author: kaushikcfd

pyop2/backends/__init__.py

@@ -0,0 +1,43 @@
+class _not_implemented:  # noqa
+    """Not Implemented"""
+
+
+class AbstractComputeBackend:
+    """
+    Abstract class to record all the backend specific implementation of
+    :mod:`pyop2`'s data structures.
+    """
+    GlobalKernel = _not_implemented
+    Parloop = _not_implemented
+    Set = _not_implemented
+    ExtrudedSet = _not_implemented
+    MixedSet = _not_implemented
+    Subset = _not_implemented
+    DataSet = _not_implemented
+    MixedDataSet = _not_implemented
+    Map = _not_implemented
+    MixedMap = _not_implemented
+    Dat = _not_implemented
+    MixedDat = _not_implemented
+    DatView = _not_implemented
+    Mat = _not_implemented
+    Global = _not_implemented
+    GlobalDataSet = _not_implemented
+    PETScVecType = _not_implemented
+
+    def _getattr_(self, key):
+        val = super(AbstractComputeBackend, self)._getattr_(key)
+        if val is _not_implemented:
+            raise NotImplementedError("'{}' is not implemented for backend"
+                                      " '{}'.".format(val, self.__name__))
+        return val
+
+    def turn_on_offloading(self):
+        raise NotImplementedError()
+
+    def turn_off_offloading(self):
+        raise NotImplementedError()
+
+    @property
+    def cache_key(self):
+        raise NotImplementedError()

setup.py

@@ -147,7 +147,7 @@ def run(self):
       install_requires=install_requires,
       dependency_links=dep_links,
       test_requires=test_requires,
-      packages=['pyop2', 'pyop2.codegen', 'pyop2.types'],
+      packages=['pyop2', 'pyop2.backends', 'pyop2.codegen', 'pyop2.types'],
       package_data={
           'pyop2': ['assets/*', '*.h', '*.pxd', '*.pyx', 'codegen/c/*.c']},
       scripts=glob('scripts/*'),