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Acquisition
Commit 089f8741 authored by Jim Fulton's avatar Jim Fulton
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Added cyclic garbage collection support to Acquisition wrappers.

parent d9f085b9
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Showing with 195 additions and 75 deletions
_Acquisition.c
View file @ 089f8741
......@@ -87,7 +87,7 @@ init_py_names(void)
static PyObject *
CallMethodO(PyObject *self, PyObject *name,
PyObject *args, PyObject *kw)
PyObject *args, PyObject *kw)
{
if (! args && PyErr_Occurred()) return NULL;
UNLESS(name=PyObject_GetAttr(self,name)) {
......@@ -115,25 +115,35 @@ staticforward PyExtensionClass Wrappertype, XaqWrappertype;
(O)->ob_type==(PyTypeObject*)&XaqWrappertype)
#define WRAPPER(O) ((Wrapper*)(O))
static PyObject *
Wrapper__init__(Wrapper *self, PyObject *args)
static int
Wrapper__init__(Wrapper *self, PyObject *args, PyObject *kwargs)
{
PyObject *obj, *container;
UNLESS(PyArg_Parse(args,"(OO)",&obj,&container)) return NULL;
if (kwargs && PyDict_Size(kwargs) != 0)
{
PyErr_SetString(PyExc_TypeError,
"kwyword arguments not allowed");
return -1;
}
UNLESS(PyArg_ParseTuple(args, "OO:__init__", &obj, &container)) return -1;
if (self == WRAPPER(obj)) {
PyErr_SetString(PyExc_ValueError,
"Cannot wrap acquisition wrapper in itself (Wrapper__init__)");
return NULL;
return -1;
}
Py_INCREF(obj);
Py_INCREF(container);
self->obj=obj;
self->container=container;
Py_INCREF(Py_None);
return Py_None;
if (container != Py_None)
{
Py_INCREF(container);
self->container=container;
}
return 0;
}
/* ---------------------------------------------------------------- */
......@@ -150,8 +160,7 @@ __of__(PyObject *inst, PyObject *parent)
PyTuple_SET_ITEM(t,0,NULL);
Py_DECREF(t);
if (r
&& r->ob_refcnt==1
if (r != NULL
&& isWrapper(r)
&& WRAPPER(r)->container && isWrapper(WRAPPER(r)->container)
)
......@@ -160,9 +169,21 @@ __of__(PyObject *inst, PyObject *parent)
WRAPPER(WRAPPER(r)->container)->obj)
)
{
/* Simplify wrapper */
Py_XINCREF(WRAPPER(WRAPPER(r)->obj)->obj);
ASSIGN(WRAPPER(r)->obj, WRAPPER(WRAPPER(r)->obj)->obj);
if (r->ob_refcnt !=1 )
{
t = PyObject_CallFunctionObjArgs((PyObject *)(r->ob_type),
WRAPPER(r)->obj,
WRAPPER(r)->container,
NULL);
Py_DECREF(r);
if (t==NULL)
return NULL;
r = t;
}
/* Simplify wrapper */
Py_XINCREF(WRAPPER(WRAPPER(r)->obj)->obj);
ASSIGN(WRAPPER(r)->obj, WRAPPER(WRAPPER(r)->obj)->obj);
}
return r;
......@@ -171,62 +192,64 @@ err:
return NULL;
}
static Wrapper *freeWrappers=0;
static int nWrappers=0;
#define MAX_CACHED_WRAPPERS 200
static PyObject *
newWrapper(PyObject *obj, PyObject *container, PyTypeObject *Wrappertype)
Wrapper_descrget(Wrapper *self, PyObject *inst, PyObject *cls)
{
Wrapper *self;
if (freeWrappers)
{
self=freeWrappers;
freeWrappers=(Wrapper*)self->obj;
_Py_NewReference((PyObject *)self);
assert(self->ob_refcnt == 1);
self->ob_type=Wrappertype;
nWrappers--;
}
else
if (inst == NULL)
{
UNLESS(self = PyObject_NEW(Wrapper, Wrappertype)) return NULL;
Py_INCREF(self);
return (PyObject *)self;
}
return __of__((PyObject *)self, inst);
}
if (self == WRAPPER(obj)) {
PyErr_SetString(PyExc_ValueError,
"Cannot wrap acquisition wrapper in itself (newWrapper)");
Py_DECREF(self);
return NULL;
}
Py_INCREF(Wrappertype);
Py_XINCREF(obj);
Py_XINCREF(container);
self->obj=obj;
self->container=container;
return OBJECT(self);
}
#define newWrapper(obj, container, Wrappertype) \
PyObject_CallFunctionObjArgs(OBJECT(Wrappertype), obj, container, NULL)
static void
Wrapper_dealloc(Wrapper *self)
static int
Wrapper_traverse(Wrapper *self, visitproc visit, void *arg)
{
Py_XDECREF(self->obj);
Py_XDECREF(self->container);
Py_DECREF(self->ob_type);
int vret;
if (nWrappers < MAX_CACHED_WRAPPERS)
{
self->obj=OBJECT(freeWrappers);
freeWrappers=self;
nWrappers++;
if (self->obj) {
vret = visit(self->obj, arg);
if (vret != 0)
return vret;
}
else
{
PyObject_DEL(self);
if (self->container) {
vret = visit(self->container, arg);
if (vret != 0)
return vret;
}
return 0;
}
static int
Wrapper_clear(Wrapper *self)
{
PyObject *tmp;
tmp = self->obj;
self->obj = NULL;
Py_XDECREF(tmp);
tmp = self->container;
self->container = NULL;
Py_XDECREF(tmp);
return 0;
}
static void
Wrapper_dealloc(Wrapper *self)
{
Wrapper_clear(self);
self->ob_type->tp_free((PyObject*)self);
}
static PyObject *
......@@ -1113,10 +1136,7 @@ Wrappers_are_not_picklable(PyObject *wrapper, PyObject *args)
return NULL;
}
static struct PyMethodDef Wrapper_methods[] = {
{"__init__", (PyCFunction)Wrapper__init__, 0,
"Initialize an Acquirer Wrapper"},
{"acquire", (PyCFunction)Wrapper_acquire_method,
METH_VARARGS|METH_KEYWORDS,
"Get an attribute, acquiring it if necessary"},
......@@ -1155,12 +1175,27 @@ static PyExtensionClass Wrappertype = {
(reprfunc)Wrapper_str, /*tp_str*/
(getattrofunc)Wrapper_getattro, /*tp_getattr with object key*/
(setattrofunc)Wrapper_setattro, /*tp_setattr with object key*/
/* Space for future expansion */
0L,0L,
/* tp_as_buffer */ 0,
/* tp_flags */ Py_TPFLAGS_DEFAULT
| Py_TPFLAGS_BASETYPE
| Py_TPFLAGS_HAVE_GC
,
"Wrapper object for implicit acquisition", /* Documentation string */
METHOD_CHAIN(Wrapper_methods),
(void*)(EXTENSIONCLASS_BINDABLE_FLAG),
/* tp_traverse */ (traverseproc)Wrapper_traverse,
/* tp_clear */ (inquiry)Wrapper_clear,
/* tp_richcompare */ (richcmpfunc)0,
/* tp_weaklistoffset */ (long)0,
/* tp_iter */ (getiterfunc)0,
/* tp_iternext */ (iternextfunc)0,
/* tp_methods */ Wrapper_methods,
/* tp_members */ 0,
/* tp_getset */ 0,
/* tp_base */ 0,
/* tp_dict */ 0,
/* tp_descr_get */ (descrgetfunc)Wrapper_descrget,
/* tp_descr_set */ 0,
/* tp_dictoffset */ 0,
/* tp_init */ (initproc)Wrapper__init__,
};
static PyExtensionClass XaqWrappertype = {
......@@ -1184,12 +1219,27 @@ static PyExtensionClass XaqWrappertype = {
(reprfunc)Wrapper_str, /*tp_str*/
(getattrofunc)Xaq_getattro, /*tp_getattr with object key*/
(setattrofunc)Wrapper_setattro, /*tp_setattr with object key*/
/* Space for future expansion */
0L,0L,
"Wrapper object for explicit acquisition", /* Documentation string */
METHOD_CHAIN(Wrapper_methods),
(void*)(EXTENSIONCLASS_BINDABLE_FLAG),
/* tp_as_buffer */ 0,
/* tp_flags */ Py_TPFLAGS_DEFAULT
| Py_TPFLAGS_BASETYPE
| Py_TPFLAGS_HAVE_GC
,
"Wrapper object for implicit acquisition", /* Documentation string */
/* tp_traverse */ (traverseproc)Wrapper_traverse,
/* tp_clear */ (inquiry)Wrapper_clear,
/* tp_richcompare */ (richcmpfunc)0,
/* tp_weaklistoffset */ (long)0,
/* tp_iter */ (getiterfunc)0,
/* tp_iternext */ (iternextfunc)0,
/* tp_methods */ Wrapper_methods,
/* tp_members */ 0,
/* tp_getset */ 0,
/* tp_base */ 0,
/* tp_dict */ 0,
/* tp_descr_get */ (descrgetfunc)Wrapper_descrget,
/* tp_descr_set */ 0,
/* tp_dictoffset */ 0,
/* tp_init */ (initproc)Wrapper__init__,
};
static PyObject *
......@@ -1262,7 +1312,7 @@ capi_aq_acquire(PyObject *self, PyObject *name, PyObject *filter,
if (! filter) return PyObject_GetAttr(self, name);
/* Crap, we've got to construct a wrapper so we can use Wrapper_findattr */
UNLESS (self=newWrapper(self, NULL, (PyTypeObject*)&Wrappertype))
UNLESS (self=newWrapper(self, Py_None, (PyTypeObject*)&Wrappertype))
return NULL;
result=Wrapper_findattr(WRAPPER(self), name, filter, extra, OBJECT(self),
......
tests.py
View file @ 089f8741
......@@ -369,6 +369,7 @@ def test_unwrapped():
Traceback (most recent call last):
...
AttributeError: id
>>> Acquisition.aq_acquire(c, 'id',
... lambda searched, parent, name, ob, extra: extra,
... 1)
......@@ -1386,7 +1387,7 @@ def test_creating_wrappers_directly():
>>> w = ImplicitAcquisitionWrapper(a.b)
Traceback (most recent call last):
...
TypeError: argument must be 2-item sequence, not B
TypeError: __init__() takes exactly 2 arguments (1 given)
We can reassign aq_parent
......@@ -1399,8 +1400,12 @@ def test_creating_wrappers_directly():
>>> w = ImplicitAcquisitionWrapper()
Traceback (most recent call last):
...
TypeError: function takes at least one argument
TypeError: __init__() takes exactly 2 arguments (0 given)
>>> w = ImplicitAcquisitionWrapper(obj=1)
Traceback (most recent call last):
...
TypeError: kwyword arguments not allowed
"""
def test_cant_pickle_acquisition_wrappers_classic():
......@@ -1524,6 +1529,71 @@ def showaq(m_self, indent=''):
rval = rval + indent + id + "\n"
return rval
def test_Basic_gc():
"""Test to make sure that EC instances participate in GC
>>> from ExtensionClass import Base
>>> import gc
>>> thresholds = gc.get_threshold()
>>> gc.set_threshold(0)
>>> for B in I, E:
... class C1(B):
... pass
...
... class C2(Base):
... def __del__(self):
... print 'removed'
...
... a=C1('a')
... a.b = C1('a.b')
... a.b.a = a
... a.b.c = C2()
... ignore = gc.collect()
... del a
... removed = gc.collect()
... print removed > 0
removed
True
removed
True
>>> gc.set_threshold(*thresholds)
"""
def test_Wrapper_gc():
"""Test to make sure that EC instances participate in GC
>>> import gc
>>> thresholds = gc.get_threshold()
>>> gc.set_threshold(0)
>>> for B in I, E:
... class C:
... def __del__(self):
... print 'removed'
...
... a=B('a')
... a.b = B('b')
... a.a_b = a.b # circ ref through wrapper
... a.b.c = C()
... ignored = gc.collect()
... del a
... removed = gc.collect()
... removed > 0
removed
True
removed
True
>>> gc.set_threshold(*thresholds)
"""
import unittest
......
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