closes #649: remove usage of ABCMeta to prevent performance issues on IronPython

Author: gonzalocasas

src/compas/base.py

@@ -1,21 +1,28 @@
+"""
+If you ever feel tempted to use ABCMeta in your code: don't, just DON'T.
+Assigning __metaclass__ = ABCMeta to a class causes a severe memory leak/performance
+degradation on IronPython 2.7.
+
+See these issues for more details:
+ - https://github.com/compas-dev/compas/issues/562
+ - https://github.com/compas-dev/compas/issues/649
+"""
 from __future__ import print_function
 from __future__ import absolute_import
 from __future__ import division
 
-import abc
 import json
 from uuid import uuid4
 
 from compas.utilities import DataEncoder
 from compas.utilities import DataDecoder
-from compas.utilities import abstractclassmethod
-
-ABC = abc.ABCMeta('ABC', (object,), {'__slots__': ()})
 
 
 __all__ = [
     'Base',
 ]
+import abc
+ABC = abc.ABCMeta('ABC', (object,), {'__slots__': ()})
 
 
 class Base(ABC):
@@ -73,24 +80,22 @@ def dtype(self):
         """
         return "{}/{}".format(".".join(self.__class__.__module__.split(".")[:2]), self.__class__.__name__)
 
-    @abc.abstractproperty
+    @property
     def data(self):
         """dict :
         The representation of the object as native Python data.
         The structure uf the data is described by the data schema.
         """
-        pass
+        raise NotImplementedError
 
     @data.setter
     def data(self, data):
         pass
 
-    @abstractclassmethod
     def from_data(cls, data):
         """Construct an object of this type from the provided data."""
-        pass
+        raise NotImplementedError
 
-    @abc.abstractmethod
     def to_data(self):
         """Convert an object to its native data representation.
 
@@ -99,9 +104,8 @@ def to_data(self):
         dict
             The data representation of the object as described by the schema.
         """
-        pass
+        raise NotImplementedError
 
-    @abstractclassmethod
     def from_json(cls, filepath):
         """Construct an object from serialised data contained in a JSON file.
 
@@ -110,9 +114,8 @@ def from_json(cls, filepath):
         filepath: str
             The path to the file for serialisation.
         """
-        pass
+        raise NotImplementedError
 
-    @abc.abstractmethod
     def to_json(self, filepath):
         """Serialize the data representation of an object to a JSON file.
 
@@ -121,7 +124,7 @@ def to_json(self, filepath):
         filepath: str
             The path to the file containing the data.
         """
-        pass
+        raise NotImplementedError
 
     def __getstate__(self):
         """Return the object data for state state serialisation with older pickle protocols."""

src/compas/datastructures/_mutablemapping.py

@@ -5,7 +5,9 @@
  * The Mapping class does not have a __metaclass__ = ABCMeta set
    because this causes performance issues on IronPython 2.7.x
 
-See this issue for more details: https://github.com/compas-dev/compas/issues/562
+See these issues for more details:
+ - https://github.com/compas-dev/compas/issues/562
+ - https://github.com/compas-dev/compas/issues/649
 """
 from __future__ import absolute_import
 from __future__ import division

src/compas/robots/base_artist/_artist.py

@@ -2,24 +2,20 @@
 from __future__ import division
 from __future__ import print_function
 
-import abc
 import itertools
 
 from compas.geometry import Frame
 from compas.geometry import Scale
 from compas.geometry import Transformation
 from compas.robots import Geometry
 
-ABC = abc.ABCMeta('ABC', (object,), {'__slots__': ()})
-
 
 __all__ = [
     'BaseRobotModelArtist'
 ]
 
 
-class AbstractRobotModelArtist(ABC):
-    @abc.abstractmethod
+class AbstractRobotModelArtist(object):
     def transform(self, geometry, transformation):
         """Transforms a CAD-specific geometry using a **COMPAS** transformation.
 
@@ -32,7 +28,6 @@ def transform(self, geometry, transformation):
         """
         raise NotImplementedError
 
-    @abc.abstractmethod
     def draw_geometry(self, geometry, name=None, color=None):
         """Draw a **COMPAS** geometry in the respective CAD environment.
 

src/compas_ghpython/artists/_artist.py

@@ -2,24 +2,19 @@
 from __future__ import absolute_import
 from __future__ import division
 
-import abc
-
-ABC = abc.ABCMeta('ABC', (object,), {'__slots__': ()})
-
 
 __all__ = ["BaseArtist"]
 
 
-class BaseArtist(ABC):
+class BaseArtist(object):
     """Abstract base class for all GH artists.
     """
 
     def __init__(self):
         pass
 
-    @abc.abstractmethod
     def draw(self):
-        pass
+        raise NotImplementedError
 
     @staticmethod
     def draw_collection(collection):

src/compas_rhino/artists/_artist.py

@@ -2,19 +2,16 @@
 from __future__ import absolute_import
 from __future__ import division
 
-import abc
 import compas_rhino
 
-ABC = abc.ABCMeta('ABC', (object,), {'__slots__': ()})
-
 
 __all__ = ["BaseArtist"]
 
 
 _ITEM_ARTIST = {}
 
 
-class BaseArtist(ABC):
+class BaseArtist(object):
     """Base class for all Rhino artists.
 
     Attributes
@@ -51,9 +48,8 @@ def build(item, **kwargs):
         artist = artist_type(item, **kwargs)
         return artist
 
-    @abc.abstractmethod
     def draw(self):
-        pass
+        raise NotImplementedError
 
     def redraw(self):
         compas_rhino.rs.EnableRedraw(True)

src/compas_rhino/forms/base.py

@@ -2,22 +2,17 @@
 from __future__ import absolute_import
 from __future__ import division
 
-import abc
-
 import System
 from System.Windows.Forms import DialogResult
 from System.Windows.Forms import FormBorderStyle
 
 import Rhino
 
 
-ABC = abc.ABCMeta('ABC', (object,), {'__slots__': ()})
-
-
 __all__ = ['BaseForm']
 
 
-class BaseForm(System.Windows.Forms.Form, ABC):
+class BaseForm(System.Windows.Forms.Form):
     """Base class for Windows forms."""
 
     def __init__(self, title='Form', width=None, height=None):
@@ -33,9 +28,8 @@ def __init__(self, title='Form', width=None, height=None):
         self.ResumeLayout()
         self.FormClosed += self.on_form_closed
 
-    @abc.abstractmethod
     def init(self):
-        pass
+        raise NotImplementedError
 
     def show(self):
         """Show the form as a modal dialog.

src/compas_rhino/geometry/_geometry.py

@@ -2,19 +2,16 @@
 from __future__ import absolute_import
 from __future__ import division
 
-import abc
 import Rhino
 import compas_rhino
 
 from compas.utilities import abstractclassmethod
 
-ABC = abc.ABCMeta('ABC', (object,), {'__slots__': ()})
-
 
 __all__ = ['BaseRhinoGeometry']
 
 
-class BaseRhinoGeometry(ABC):
+class BaseRhinoGeometry(object):
     """Base class for Rhino geometry objects.
 
     Attributes
@@ -107,9 +104,8 @@ def from_geometry(cls, geometry):
     def from_selection(cls):
         pass
 
-    @abc.abstractmethod
     def to_compas(self, cls=None):
-        pass
+        raise NotImplementedError
 
     def transform(self, T):
         """Transform the Rhino object.

src/compas_rhino/objects/_object.py

@@ -2,20 +2,17 @@
 from __future__ import division
 from __future__ import print_function
 
-import abc
 from uuid import uuid4
 from compas_rhino.artists import BaseArtist
 
-ABC = abc.ABCMeta('ABC', (object,), {'__slots__': ()})
-
 
 __all__ = ['BaseObject']
 
 
 _ITEM_OBJECT = {}
 
 
-class BaseObject(ABC):
+class BaseObject(object):
     """Abstract base class for COMPAS Rhino objects.
 
     Parameters
@@ -133,38 +130,33 @@ def build(item, **kwargs):
         object_type = _ITEM_OBJECT[type(item)]
         return object_type(item, **kwargs)
 
-    @abc.abstractmethod
     def clear(self):
         """Clear all previously created Rhino objects."""
-        pass
+        raise NotImplementedError
 
     def clear_layer(self):
         """Clear the layer of the object."""
         self.artist.clear_layer()
 
-    @abc.abstractmethod
     def draw(self):
         """Draw the object representing the item."""
-        pass
+        raise NotImplementedError
 
     def redraw(self):
         """Redraw the Rhino scene/view."""
         self.artist.redraw()
 
-    @abc.abstractmethod
     def select(self):
         """Select the object representing the item."""
-        pass
+        raise NotImplementedError
 
-    @abc.abstractmethod
     def modify(self):
         """Modify the item represented by the object."""
-        pass
+        raise NotImplementedError
 
-    @abc.abstractmethod
     def move(self):
         """Move the item represented by the object."""
-        pass
+        raise NotImplementedError
 
 
 # ============================================================================