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##Copyright 2008-2014 Thomas Paviot (tpaviot@gmail.com)

##

##This file is part of pythonOCC.

##

##pythonOCC is free software: you can redistribute it and/or modify

##it under the terms of the GNU Lesser General Public License as published by

##the Free Software Foundation, either version 3 of the License, or

##(at your option) any later version.

##

##pythonOCC is distributed in the hope that it will be useful,

##but WITHOUT ANY WARRANTY; without even the implied warranty of

##MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

##GNU Lesser General Public License for more details.

##

##You should have received a copy of the GNU Lesser General Public License

##along with pythonOCC. If not, see <http://www.gnu.org/licenses/>.

# Init logging system

import logging

logging.basicConfig()

logger = logging.getLogger('GarbageCollector')

def set_debug():

logger.setLevel(logging.DEBUG)

class GarbageCollector(object):

""" Garbage collector for OCC objects

"""

def __init__(self):

#self._collected_objects = []

self._handles = []

self._transients = []

self._misc = []

# The list for the prevented objects

self._prevent = []

# define contexts lists

self._handles_contexts = []

self._transients_contexts = []

self._misc_contexts = []

def prevent_object(self, obj):

''' Prevent an object from being deleted. This object is temporary

stored in a list to increase its refecount.

'''

self._prevent.append(obj)

def push_context(self):

''' Create a new context. When the push context method is called,

objects are collected in this new context. When the context is popped,

erase the content of the context.

'''

# store the current objects in the contexts list

self._handles_contexts.append(self._handles)

self._transients_contexts.append(self._transients)

self._misc_contexts.append(self._misc)

# Then erase the content of the current lists

self._handles = []

self._transients = []

self._misc = []

def pop_context(self):

self._handles = self._handles_contexts.pop()

self._transients = self._transients_contexts.pop()

self._misc = self._misc_contexts.pop()

def collect_object(self, obj_deleted):

''' This method is called whenever a pythonOCC instance is deleted.'''

#self._collected_objects.append(obj_deleted)

if hasattr(obj_deleted, 'was_purged'):

return False

if obj_deleted.__class__.__name__.startswith('Handle'):

self._handles.append(obj_deleted)

logger.info('collected Handle')

elif hasattr(obj_deleted, "GetHandle"):

self._transients.append(obj_deleted)

logger.info('collected transient')

else:

self._misc.append(obj_deleted)

logger.info('collected misc')

def smart_purge(self):

# TODO: need to reverse the lists first in order

# to start with the olders objects?

# Remove Handles

while len(self._handles) > 0:

handle = self._handles.pop()

handle.Nullify() # decrement ref counting_kill_pointed()

# after that, the reference counting of transients objects

# in the garbage should be 0

handle.was_purged = True

# Remove Transients

for transient in self._transients:

transient_must_be_purged = False

if transient.GetRefCount() == 0:

transient_must_be_purged = True

if transient_must_be_purged:

transient._kill_pointed()

transient.was_purged = True

self._transients.remove(transient)

# Remove other objects

while len(self._misc) > 0:

misc = self._misc.pop()

misc._kill_pointed()

misc.was_purged = True

garbage = GarbageCollector()