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decorator to synchronize method at class / module level

Author:
mwolgemuth
Posted:
January 23, 2009
Language:
Python
Version:
1.0
Score:
1 (after 1 ratings)

This decorator allows you to wrap class methods or module functions and synchronize access to them. It maintains a dict of locks with a key for each unique name of combined module name and method name. (Implementing class name is lost in decorator? Otherwise it would have class name too if available.)

Effectively it functions as a class level method synchronizer, with the lock handling completely hidden from the wrapped function.

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from threading import Lock

_lock_table_lock = Lock()
_lock_table = {}


# decorate drops method attributes like .im_class? bleah
def synchronized_module_function():
    """ Synchronization decorator. """
    def decorate(f):
        def new_func(*args, **kw):
            lock = _get_lock_for_method(f)
            lock.acquire()
            try:
                return f(*args, **kw)
            finally:
                lock.release()
        return new_func
    return decorate

def _get_lock_for_method(f):
    # key from module class is from, func name -- would like class name but not available?
    _lock_table_lock.acquire()
    try:
        key = "%s%s" % (f.__module__, f.__name__)
        lock = None
        try:
            lock = _lock_table[key]
        except KeyError:
            lock = _lock_table[key] = Lock()
    finally:
        _lock_table_lock.release()
    return lock

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