I define support for hookable instance methods.
These are methods which you can register pre-call and post-call
external functions to augment their functionality. People familiar with
more esoteric languages may think of these as "method
combinations".
This could be used to add optional preconditions, user-extensible
callbacks (a-la emacs) or a thread-safety mechanism.
The four exported calls are:
All have the signature (class, methodName, callable), and the callable
they take must always have the signature (instance, *args, **kw) unless
the particular signature of the method they hook is known.
Hooks should typically not throw exceptions, however, no effort will
be made by this module to prevent them from doing so. Pre-hooks will
always be called, but post-hooks will only be called if the pre-hooks do
not raise any exceptions (they will still be called if the main method
raises an exception). The return values and exception status of the main
method will be propogated (assuming none of the hooks raise an
exception). Hooks will be executed in the order in which they are
added.
| Function Summary |
| |
_addHook(klass,
name,
phase,
func)
(private) adds a hook to a method on a class |
| |
_dehook(klass,
name)
(private) causes a certain method name no longer to be hooked on a
class |
| |
_enhook(klass,
name)
(private) causes a certain method name to be hooked on a class |
| |
_removeHook(klass,
name,
phase,
func)
(private) removes a hook from a method on a class |
| |
_XXX(k,
n,
s)
string manipulation garbage |
| |
addPost(klass,
name,
func)
hook.addPost(klass, name, func) -> None |
| |
addPre(klass,
name,
func)
hook.addPre(klass, name, func) -> None |
| |
ORIG(k,
n)
(private) munging to turn a method name into an `original'
identifier |
| |
POST(k,
n)
(private) munging to turn a method name into a
post-hook-method-name |
| |
PRE(k,
n)
(private) munging to turn a method name into a
pre-hook-method-name |
| |
removePost(klass,
name,
func)
hook.removePre(klass, name, func) -> None |
| |
removePre(klass,
name,
func)
hook.removePre(klass, name, func) -> None |