def test_plugin_interface(self):
class IFoo(Interface):
pass
class myFoo(Plugin):
implements(IFoo)
ep = ExtensionPoint(IFoo)
self.assertEqual(ep.extensions(), [])
self.assertEqual(IFoo._plugins, {myFoo: {}})
self.assertEqual(len(ep), 0)
a = myFoo()
self.assertEqual(ep.extensions(), [])
self.assertEqual(IFoo._plugins, {
myFoo: {
0: (weakref.ref(a), False)
},
})
self.assertEqual(len(ep), 0)
a.activate()
self.assertEqual(ep.extensions(), [a])
self.assertEqual(IFoo._plugins, {
myFoo: {
0: (weakref.ref(a), True)
},
})
self.assertEqual(len(ep), 1)
a.deactivate()
self.assertEqual(ep.extensions(), [])
self.assertEqual(IFoo._plugins, {
myFoo: {
0: (weakref.ref(a), False)
},
})
self.assertEqual(len(ep), 0)
# Free a and make sure the garbage collector collects it (so
# that the weakref will be removed from IFoo._plugins)
a = None
gc.collect()
gc.collect()
gc.collect()
self.assertEqual(ep.extensions(), [])
self.assertEqual(IFoo._plugins, {myFoo: {}})
self.assertEqual(len(ep), 0)
def test_singleton_plugin_interface(self):
class IFoo(Interface):
pass
class mySingleton(SingletonPlugin):
implements(IFoo)
ep = ExtensionPoint(IFoo)
self.assertEqual(ep.extensions(), [])
self.assertEqual(IFoo._plugins, {
mySingleton: {
0: (weakref.ref(mySingleton.__singleton__), False)
},
})
self.assertIsNotNone(mySingleton.__singleton__)
with self.assertRaisesRegex(
RuntimeError,
'Cannot create multiple singleton plugin instances'):
mySingleton()
class myDerivedSingleton(mySingleton):
pass
self.assertEqual(ep.extensions(), [])
self.assertEqual(
IFoo._plugins, {
mySingleton: {
0: (weakref.ref(mySingleton.__singleton__), False)
},
myDerivedSingleton: {
1: (weakref.ref(myDerivedSingleton.__singleton__), False)
},
})
self.assertIsNotNone(myDerivedSingleton.__singleton__)
self.assertIsNot(mySingleton.__singleton__,
myDerivedSingleton.__singleton__)
class myDerivedNonSingleton(mySingleton):
__singleton__ = False
self.assertEqual(ep.extensions(), [])
self.assertEqual(
IFoo._plugins, {
mySingleton: {
0: (weakref.ref(mySingleton.__singleton__), False)
},
myDerivedSingleton: {
1: (weakref.ref(myDerivedSingleton.__singleton__), False)
},
myDerivedNonSingleton: {},
})
self.assertIsNone(myDerivedNonSingleton.__singleton__)
class myServiceSingleton(mySingleton):
implements(IFoo, service=True)
self.assertEqual(ep.extensions(), [myServiceSingleton.__singleton__])
self.assertEqual(
IFoo._plugins, {
mySingleton: {
0: (weakref.ref(mySingleton.__singleton__), False)
},
myDerivedSingleton: {
1: (weakref.ref(myDerivedSingleton.__singleton__), False)
},
myDerivedNonSingleton: {},
myServiceSingleton: {
2: (weakref.ref(myServiceSingleton.__singleton__), True)
},
})
self.assertIsNotNone(myServiceSingleton.__singleton__)
