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2005-04-01 Richard Taylor <rjt-gramps@thegrindstone.me.uk>

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* src/GrampsDBCallback.py: Added code to disable/enable signals on
	a per instance or all instance bassis. Improved test code and
	changed type checking to use isinstance instead of type().


svn: r4291
This commit is contained in:
Richard Taylor 2005-04-04 15:53:40 +00:00
parent 64b2a41b34
commit 76c89d5f08
2 changed files with 204 additions and 78 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2005-04-01 Richard Taylor <rjt-gramps@thegrindstone.me.uk>
* src/GrampsDBCallback.py: Added code to disable/enable signals on
a per instance or all instance bassis. Improved test code and
changed type checking to use isinstance instead of type().
2005-04-04 Alex Roitman <shura@gramps-project.org>
* src/ImageSelect.py (on_savephoto_clicked): Pass transaction to
savephoto; (savephoto): take transaction argument);

267
src/GrampsDBCallback.py
View File

@ -21,6 +21,7 @@
# $Id$
import types
import sys
#-------------------------------------------------------------------------
#
@ -72,21 +73,36 @@ class GrampsDBCallback(object):
t.emit_signal()
r = R()
# connect to a method
t.connect_object('test-signal', R.func, r)
t.emit_signal()
"""
def __init__(self):
self.__callback_map = {}
self.__signal_map = {}
# If this True no signals will be emitted from any instance of
# any class derived from this class. This should be toggled using
# the class methods, dissable_all_signals() and enable_all_signals().
__BLOCK_ALL_SIGNALS = False
def __init__(self):
self.__block_instance_signals = False # controls the blocking of
# signals from this instance
self.__callback_map = {} # dictionary containing all the connected
# callback functions. The keys are the
# signal names and the values are the
# bound methods that will be called when
# the signal is emitted
self.__signal_map = {} # dictionary contains all the signals that
# this instance can emit. The keys are the
# signal names and the values are tuples
# containing the list of types of the arguments
# that the callback methods must accept.
# To speed up the signal type checking the signals declared by
# each of the classes in the inheritance tree of this instance
# are consolidated into a single dictionary.
# The signals can't change so we only need to do this once.
# Build signal list, the signals can't change so we only
# need to do this once.
def trav(cls):
"""A traversal function to walk through all the classes in
the inheritance tree. The return is a list of all the
__signals__ dictionaries."""
if cls.__dict__.has_key('__signals__'):
signal_list = [cls.__signals__]
else:
@ -102,6 +118,9 @@ class GrampsDBCallback(object):
# Build a signal dict from the list of signal dicts
for s in trav(self.__class__):
for (k,v) in s.items():
if self.__signal_map.has_key(k):
# signal name clash
sys.err.write("Warning: signal name clash: ", str(k))
self.__signal_map[k] = v
# self.__signal_map now contains the connonical list
@ -111,7 +130,7 @@ class GrampsDBCallback(object):
def connect(self, signal_name, callback):
# Check that signal exists.
if signal_name not in self.__signal_map.keys():
print "Warning: attempt to connect to unknown signal: ", str(signal_name)
sys.stderr.write("Warning: attempt to connect to unknown signal: ", str(signal_name))
return
# Add callable to callback_map
@ -119,36 +138,37 @@ class GrampsDBCallback(object):
self.__callback_map[signal_name] = []
self.__callback_map[signal_name].append(callback)
def connect_object(self, signal_name, class_method, instance):
# Check that signal exists.
if signal_name not in self.__signal_map.keys():
print "Warning: attempt to connect to unknown signal: ", str(signal_name)
def emit(self, signal_name, args=tuple()):
# Check that signals are not blocked
if GrampsDBCallback.__BLOCK_ALL_SIGNALS or \
self.__block_instance_signals:
return
# Add object and instance to callback_map
self.__callback_map[signal_name].append((class_method,instance))
def emit(self, signal_name, args=tuple()):
# Check signal exists
if signal_name not in self.__signal_map.keys():
print "Warning: attempt to emit to unknown signal: ", str(signal_name)
sys.stderr.write("Warning: attempt to emit to unknown signal: ", str(signal_name))
return
# type check arguments
arg_types = self.__signal_map[signal_name]
if arg_types == None and len(args) > 0:
print "Warning: signal emitted with wrong number of args: ", str(signal_name)
sys.stderr.write("Warning: signal emitted with "\
"wrong number of args: ", str(signal_name))
return
if len(args) > 0:
if len(args) != len(arg_types):
print "Warning: signal emitted with wrong number of args: ", str(signal_name)
sys.stderr.write("Warning: signal emitted with "\
"wrong number of args: ", str(signal_name))
return
if arg_types != None:
for i in range(0,len(arg_types)):
if type(args[i]) != arg_types[i]:
print "Warning: signal emitted with wrong arg types: ", str(signal_name)
if not isinstance(args[i],arg_types[i]):
sys.stderr.write("Warning: signal emitted with "\
"wrong arg types: %s" % (str(signal_name),))
sys.stderr.write("arg passed was: %s type should be: %s"
% (args[i],repr(arg_types[i])))
return
for cb in self.__callback_map[signal_name]:
@ -159,11 +179,32 @@ class GrampsDBCallback(object):
type(cb) == types.MethodType: # call func
cb(*args)
else:
print "Warning: badly formed entry in callback map"
sys.stderr.write("Warning: badly formed entry in callback map")
except:
print "Warning: exception occured in callback function."
sys.stderr.write("Warning: exception occured in callback function.")
#
# instance signals control methods
#
def disable_signals(self):
self.__block_instance_signals = True
def enable_signals(self):
self.__block_instance_signals = False
#
# Class methods
#
def __disable_all_signals(cls):
GrampsDBCallback.__BLOCK_ALL_SIGNALS = True
disable_all_signals = classmethod(__disable_all_signals)
def __enable_all_signals(cls):
GrampsDBCallback.__BLOCK_ALL_SIGNALS = False
enable_all_signals = classmethod(__enable_all_signals)
#-------------------------------------------------------------------------
#
@ -173,6 +214,11 @@ class GrampsDBCallback(object):
if __name__ == "__main__":
import unittest
class TestGrampsDBCallback(unittest.TestCase):
def test_simple(self):
class TestSignals(GrampsDBCallback):
@ -180,55 +226,130 @@ if __name__ == "__main__":
'test-signal' : (int,)
}
def __init__(self):
GrampsDBCallback.__init__(self)
def emit_signal(self):
self.emit('test-signal',(1,))
self.emit('test-signal',(0,2))
self.emit('test-signal',(2.0,))
class TestSignalsSubclass(TestSignals):
__signals__ = {
'test-base-signal' : (str,str,list),
'test-noargs' : None
}
def emit_signal(self):
self.emit('test-signal',(1,))
self.emit('test-base-signal',("Hi","There",[1,2,3]))
self.emit('test-noargs')
class R(object):
def func(self, i):
print "got class signal = ", 1
def fn(i):
print "got signal value = ", i
def fn2(s,t,l):
print "got signal value = ", s, t, repr(l)
def fn3():
print "got signal noargs"
rl = []
def fn(i,r=rl):
rl.append(i)
t = TestSignals()
t.connect('test-signal',fn)
t.connect('test-signal', fn)
t.connect('test-signal', fn)
t.connect('test-signal', fn)
#t.emit_signal()
t.emit('test-signal',(1,))
r = R()
t.connect_object('test-signal', R.func, r)
t.connect('test-signal',r.func)
t.emit_signal()
assert len(rl) == 1, "No signal emitted"
assert rl[0] == 1, "Wrong argument recieved"
s = TestSignalsSubclass()
s.connect('test-signal', fn)
s.connect('test-base-signal', fn2)
s.connect('test-noargs', fn3)
#s.emit_signal()
def test_subclassing(self):
class TestSignals(GrampsDBCallback):
__signals__ = {
'test-signal' : (int,)
}
class TestSignalsSubclass(TestSignals):
__signals__ = {
'test-sub-signal' : (int,),
}
rl = []
def fn(i,r=rl):
rl.append(i)
t = TestSignalsSubclass()
t.connect('test-signal',fn)
t.emit('test-signal',(1,))
assert len(rl) == 1, "No signal emitted"
assert rl[0] == 1, "Wrong argument recieved"
t.connect('test-sub-signal',fn)
t.emit('test-sub-signal',(1,))
assert len(rl) == 2, "No subclass signal emitted"
assert rl[1] == 1, "Wrong argument recieved in subclass"
def test_signal_block(self):
class TestSignals(GrampsDBCallback):
__signals__ = {
'test-signal' : (int,)
}
rl = []
def fn(i,r=rl):
rl.append(i)
t = TestSignals()
t.connect('test-signal',fn)
t.emit('test-signal',(1,))
assert len(rl) == 1, "No signal emitted"
assert rl[0] == 1, "Wrong argument recieved"
GrampsDBCallback.disable_all_signals()
t.emit('test-signal',(1,))
assert len(rl) == 1, "Signal emitted while class blocked"
GrampsDBCallback.enable_all_signals()
t.emit('test-signal',(1,))
assert len(rl) == 2, "Signals not class unblocked"
t.disable_signals()
t.emit('test-signal',(1,))
assert len(rl) == 2, "Signal emitted while instance blocked"
t.enable_signals()
t.emit('test-signal',(1,))
assert len(rl) == 3, "Signals not instance unblocked"
def test_type_checking(self):
class TestSignals(GrampsDBCallback):
__signals__ = {
'test-int' : (int,),
'test-list': (list,),
'test-object': (object,),
'test-str': (str,),
'test-float': (float,),
'test-dict': (dict,),
'test-lots': (int,str,list,object,float)
}
rl = []
def fn(i,r=rl):
rl.append(i)
t = TestSignals()
t.connect('test-int',fn), t.emit('test-int',(1,))
assert type(rl[0]) == int, "not int"
t.connect('test-list',fn), t.emit('test-list',([1,2],))
assert type(rl[1]) == list, "not list"
t.connect('test-object',fn), t.emit('test-object',(t,))
assert isinstance(rl[2],object), "not object"
t.connect('test-float',fn), t.emit('test-float',(2.3,))
assert type(rl[3]) == float, "not float"
t.connect('test-dict',fn), t.emit('test-dict',({1:2},))
assert type(rl[4]) == dict, "not dict"
rl = []
def fn2(i,s,l,o,f,r=rl):
rl.append(i)
t.connect('test-lots',fn2), t.emit('test-lots',(1,'a',[1,2],t,1.2))
assert type(rl[0]) == int, "not lots"
# This should fail because the type of arg1 is wrong
res=[]
class C:
def write(self,s,r=res):
res.append(s)
sys.stderr = C()
t.connect('test-lots',fn2), t.emit('test-lots',('a','a',[1,2],t,1.2))
assert res[0][0:8] == "Warning:", "Type error not detected"
unittest.main()