First checkin of the Python XPCOM bindings.

extensions/python/xpcom/tools/tracer_demo.py

@@ -0,0 +1,79 @@
+# Copyright (c) 2000-2001 ActiveState Tool Corporation.
+# See the file LICENSE.txt for licensing information.
+
+# This is a demo is how to use the xpcom.server "tracer" facility.
+#
+# This demo installs a tracer that uses the Python profiler.  It then
+# creates the Python test component, and references some methods
+# and properties.  It then dumps the profile statistics.
+
+# This same technique could also be used for debugging, for example.
+
+import profile
+
+p = profile.Profile()
+getters = {}
+setters = {}
+
+# A wrapper around a function - looks like a function,
+# but actually profiles the delegate.
+class TracerDelegate:
+    def __init__(self, callme):
+        self.callme = callme
+    def __call__(self, *args):
+        return p.runcall(self.callme, *args)
+
+# A wrapper around each of our XPCOM objects.  All PyXPCOM calls
+# in are made on this object, which creates a TracerDelagate around
+# every function.  As the function is called, it collects profile info.
+class Tracer:
+    def __init__(self, ob):
+        self.__dict__['_ob'] = ob
+    def __repr__(self):
+        return "<Tracer around %r>" % (self._ob,)
+    def __str__(self):
+        return "<Tracer around %r>" % (self._ob,)
+    def __getattr__(self, attr):
+        ret = getattr(self._ob, attr) # Attribute error just goes up
+        if callable(ret):
+            return TracerDelegate(ret)
+        else:
+            if not attr.startswith("_com_") and not attr.startswith("_reg_"):
+                getters[attr] = getters.setdefault(attr,0) + 1
+            return ret
+    def __setattr__(self, attr, val):
+        if self.__dict__.has_key(attr):
+            self.__dict__[attr] = val
+            return
+        setters[attr] = setters.setdefault(attr,0) + 1
+        setattr(self._ob, attr, val)
+
+# Installed as a global XPCOM function that if exists, will be called
+# to wrap each XPCOM object created.
+def MakeTracer(ob):
+    # In some cases we may be asked to wrap ourself, so handle that.
+    if isinstance(ob, Tracer):
+        return ob
+    return Tracer(ob)
+
+def test():
+    import xpcom.server, xpcom.components
+    xpcom.server.tracer = MakeTracer
+    contractid = "Python.TestComponent"
+    for i in range(100):
+        c = xpcom.components.classes[contractid].createInstance().queryInterface(xpcom.components.interfaces.nsIPythonTestInterface)
+        c.boolean_value = 0
+        a = c.boolean_value
+        c.do_boolean(0,1)
+    print "Finshed"
+    p.print_stats()
+    print "%-30s%s" % ("Attribute Gets", "Number")
+    print "-" * 36
+    for name, num in getters.items():
+        print "%-30s%d" % (name, num)
+    print "%-30s%s" % ("Attribute Sets", "Number")
+    print "-" * 36
+    for name, num in setters.items():
+        print "%-30s%d" % (name, num)
+
+test()