def instances(self, category, name=None, class_args=None, class_kwds=None):
"""
Return all existing instances corresponding to this plugin
"""
valid_instances = []
if name is None:
for plugin_name in self._plugin_instances.get(category, []):
instances = list(self._plugin_instances[category][plugin_name])
for weakref in instances:
obj = weakref()
if obj is None:
self._plugin_instances[category][plugin_name].remove(
weakref)
else:
valid_instances.append(obj)
else:
try:
# return actual value instead of weakref
valid_instances = []
for weakref in self._plugin_instances[category][name]:
obj = weakref()
if obj is None:
self._plugin_instances[category][name].remove(weakref)
else:
valid_instances.append(obj)
except KeyError:
pass
return valid_instances
def instances(self, category, name=None, class_args=None, class_kwds=None):
"""
Return all existing instances corresponding to this plugin
"""
valid_instances = []
if name is None:
for plugin_name in self._plugin_instances.get(category, []):
instances = list(self._plugin_instances[category][plugin_name])
for weakref in instances:
obj = weakref()
if obj is None:
self._plugin_instances[category][plugin_name].remove(weakref)
else:
valid_instances.append(obj)
else:
try:
# return actual value instead of weakref
valid_instances = []
for weakref in self._plugin_instances[category][name]:
obj = weakref()
if obj is None:
self._plugin_instances[category][name].remove(weakref)
else:
valid_instances.append(obj)
except KeyError:
pass
return valid_instances
def __do_all_statements(self, action, reset_cursors):
for weakref in self.__statements:
statement = weakref()
if statement is not None:
action(statement)
if reset_cursors:
for weakref in self.__cursors:
cursor = weakref()
if cursor is not None:
cursor._reset = True
def __do_all_statements(self, action, reset_cursors):
for weakref in self.__statements:
statement = weakref()
if statement is not None:
action(statement)
if reset_cursors:
for weakref in self.__cursors:
cursor = weakref()
if cursor is not None:
cursor._reset = True
def _reset_already_committed_statements(self):
lst = self.__statements_already_committed
self.__statements_already_committed = []
for weakref in lst:
statement = weakref()
if statement is not None:
statement._reset()
def __setitem__(self, index, item):
if isinstance(index, slice):
return super(Weakreflist,
self).__setitem__(index,
[weakref.ref(i) for i in item])
else:
return super(Weakreflist, self).__setitem(index, weakref(item))
def __init__(self, filename):
if isinstance(self, CIndexedRowset):
parent = CIndexedRowset
self.cdata = True
elif isinstance(self, CFilterRowset):
parent = CFilterRowset
self.cdata = False
else:
raise RuntimeError("CRowsetDiskBase: No support for '%s'" %
type(self))
f = blue.ResFile()
f.OpenAlways(filename + '.index.cr')
indexData = blue.marshal.Load(f.Read())
if indexData[0] != ROWSETVERSION:
msg = 'DiskData: File %s is version %s, but I want %s' % (
filename, indexData.version, ROWSETVERSION)
raise RuntimeError(msg)
parent.__init__(self, indexData[1], indexData[2])
self.offsets = indexData[3]
self.dataFile = blue.ResFile()
self.dataFile.OpenAlways(filename + '.data.cr')
self.maxUsage = 1
self.minAge = 60
self.loaded = {}
self.__diskRowsets__ = weakref(self)
def removeView(self, view):
"""
Remove a view that the model no longer should keep track of.
"""
for weakref in list(self.views):
ref = weakref()
if ref is view or ref is None:
self.views.remove(weakref)
def removeView(self, view):
"""
Remove a view that the model no longer should keep track of.
"""
# AM: loop on a _copy_ of the list, since we're changing it!!!
for weakref in list(self.views):
ref = weakref()
if ref is view or ref is None:
self.views.remove(weakref)
def __init__(self, coordinates, unique_id):
import weakref
self.position = coordinates
self.id = unique_id # integer
self.input = {} # node id of parent
self.output = {} # node is of daughter
self.inlet = False
self.outlet = False
self._instances.add(weakref(self))
def removeView(self, view):
"""
Remove a view that the model no longer should keep track of.
"""
# AM: loop on a _copy_ of the list, since we're changing it!!!
for weakref in list(self.views):
ref = weakref()
if ref is view or ref is None:
self.views.remove(weakref)
def __init__(self, filename):
if isinstance(self, CIndexedRowset):
parent = CIndexedRowset
self.cdata = True
elif isinstance(self, CFilterRowset):
parent = CFilterRowset
self.cdata = False
else:
raise RuntimeError("CRowsetDiskBase: No support for '%s'" % type(self))
f = blue.ResFile()
f.OpenAlways(filename + '.index.cr')
indexData = blue.marshal.Load(f.Read())
if indexData[0] != ROWSETVERSION:
msg = 'DiskData: File %s is version %s, but I want %s' % (filename, indexData.version, ROWSETVERSION)
raise RuntimeError(msg)
parent.__init__(self, indexData[1], indexData[2])
self.offsets = indexData[3]
self.dataFile = blue.ResFile()
self.dataFile.OpenAlways(filename + '.data.cr')
self.maxUsage = 1
self.minAge = 60
self.loaded = {}
self.__diskRowsets__ = weakref(self)
def proxy(*args, **kwargs):
if weakref() is not None:
weakref()(*args, **kwargs)
class Signal:
"""
Base class for all signals
Internal attributes:
receivers
{ receiverkey (id) : weakref(receiver) }
"""
def __init__(self, providing_args=None, use_caching=False):
"""
Create a new signal.
providing_args
A list of the arguments this signal can pass along in a send() call.
"""
self.receivers = []
if providing_args is None:
providing_args = []
self.providing_args = set(providing_args)
self.lock = threading.Lock()
self.use_caching = use_caching
# For convenience we create empty caches even if they are not used.
# A note about caching: if use_caching is defined, then for each
# distinct sender we cache the receivers that sender has in
# 'sender_receivers_cache'. The cache is cleaned when .connect() or
# .disconnect() is called and populated on send().
self.sender_receivers_cache = weakref.WeakKeyDictionary() if use_caching else {}
self._dead_receivers = False
def connect(self, receiver, sender=None, weak=True, dispatch_uid=None):
"""
Connect receiver to sender for signal.
Arguments:
receiver
A function or an instance method which is to receive signals.
Receivers must be hashable objects.
If weak is True, then receiver must be weak referenceable.
Receivers must be able to accept keyword arguments.
If a receiver is connected with a dispatch_uid argument, it
will not be added if another receiver was already connected
with that dispatch_uid.
sender
The sender to which the receiver should respond. Must either be
a Python object, or None to receive events from any sender.
import threading
import weakref
from django.utils.inspect import func_accepts_kwargs
def _make_id(target):
if hasattr(target, '__func__'):
return (id(target.__self__), id(target.__func__))
return id(target)
NONE_ID = _make_id(None)
# A marker for caching
NO_RECEIVERS = object()
class Signal:
"""
Base class for all signals
Internal attributes:
receivers
{ receiverkey (id) : weakref(receiver) }
def __setitem__(self, key1, key2):
self.keys1[key1] = None
self.keys2[key2] = None
self.keys1[key1] = weakref()
...
def on_draw(self):
self.clear()
self.render_list = [ref for ref in self.render_list if ref()]
for weakref in self.render_list:
weakref().draw()
