locker.LockFile Class Reference

Lock a file. More...

Inheritance diagram for locker.LockFile:

Collaboration diagram for locker.LockFile:

Public Member Functions
def	__init__
def	__del__
def	__enter__
def	__exit__

Public Attributes
	name
	temporary
	file
	log

Detailed Description

Lock a file.

The file for the lock is created if it doesn't exists and it the "temporary" argument is set to True it will also be deleted when the lock is not needed. The unlocking is done in the destructor (RAII pattern).

Definition at line 63 of file locker.py.

Constructor & Destructor Documentation

def locker.LockFile.__init__	(		self,
			name,
			temporary = False
	)

Definition at line 64 of file locker.py.

    def __init__(self, name, temporary = False):
        self.name = name
        self.temporary = temporary
        self.file = None
        self.log = logging.getLogger("LockFile")
        self.log.info("%s - Locking on %s", time.strftime("%Y-%m-%d_%H:%M:%S"), self.name)
        if not os.path.exists(name):
            mode = "w"
        else:
            self.temporary = False # I do not want to delete a file I didn't create
            mode = "r+"
        try:
            self.file = open(self.name, mode)
            lock(self.file)
        except:
            self.log.warning("Cannot acquire lock on %s", self.name)