def proxy_method(self, method, *args):
"""
Proxy for dictionary methods called over IPC pipe.
"""
import x84.bbs.session
event = 'db-%s' % (self.schema,)
session = x84.bbs.session.getsession()
session.send_event(event, (self.table, method, args))
return session.read_event(event)
def proxy_method(self, method, *args):
"""
Proxy for dictionary methods called over IPC pipe.
"""
import x84.bbs.session
event = 'db-%s' % (self.schema, )
session = x84.bbs.session.getsession()
session.send_event(event, (self.table, method, args))
return session.read_event(event)
def release(self):
"""
Release bbs-global lock on database.
"""
import x84.bbs.session
event = 'lock-%s/%s' % (self.schema, self.table)
session = x84.bbs.session.getsession()
return session.send_event(event, ('release', None))
def proxy_iter(self, method, *args):
"""
Iterable proxy for dictionary methods called over IPC pipe.
"""
import x84.bbs.session
event = 'db=%s' % (self.schema, )
session = x84.bbs.session.getsession()
session.flush_event(event)
session.send_event(event, (self.table, method, args))
data = session.read_event(event)
assert data == (None, 'StartIteration'), (
'iterable proxy used on non-iterable, %r' % (data, ))
data = session.read_event(event)
while data != (None, StopIteration):
yield data
data = session.read_event(event)
session.flush_event(event)
def release(self):
"""
Release bbs-global lock on database.
"""
import x84.bbs.session
event = 'lock-%s/%s' % (self.schema, self.table)
session = x84.bbs.session.getsession()
return session.send_event(event, ('release', None))
def proxy_iter(self, method, *args):
"""
Iterable proxy for dictionary methods called over IPC pipe.
"""
import x84.bbs.session
event = 'db=%s' % (self.schema,)
session = x84.bbs.session.getsession()
session.flush_event(event)
session.send_event(event, (self.table, method, args))
data = session.read_event(event)
assert data == (None, 'StartIteration'), (
'iterable proxy used on non-iterable, %r' % (data,))
data = session.read_event(event)
while data != (None, StopIteration):
yield data
data = session.read_event(event)
session.flush_event(event)
def acquire(self, blocking=False):
"""
Acquire a fine-grained BBS-global lock, blocking or non-blocking.
When invoked with the blocking argument set to True (the default),
block until the lock is acquired, and return True.
When invoked with the blocking argument set to False, do not block.
Returns False if lock is not acquired.
"""
import x84.bbs.session
event = 'lock-%s/%s' % (self.schema, self.table)
session = x84.bbs.session.getsession()
while True:
session.send_event(event, ('acquire', True))
if session.read_event(event):
return True
if not blocking:
return False
time.sleep(0.1)
def acquire(self, blocking=True, stale=2.0):
"""
Acquire a fine-grained BBS-global lock, blocking or non-blocking.
When invoked with the blocking argument set to True (the default),
block until the lock is acquired, and return True.
When invoked with the blocking argument set to False, do not block.
Returns False if lock is not acquired.
If the engine has held the lock longer than ``stale`` seconds, the
lock is granted anyway.
"""
import x84.bbs.session
event = 'lock-%s/%s' % (self.schema, self.table)
session = x84.bbs.session.getsession()
while True:
session.send_event(event, ('acquire', stale))
data = session.read_event(event)
if data is True or not blocking:
return data
time.sleep(0.1)
def acquire(self, blocking=True, stale=2.0):
"""
Acquire a fine-grained BBS-global lock, blocking or non-blocking.
When invoked with the blocking argument set to True (the default),
block until the lock is acquired, and return True.
When invoked with the blocking argument set to False, do not block.
Returns False if lock is not acquired.
If the engine has held the lock longer than ``stale`` seconds, the
lock is granted anyway.
"""
import x84.bbs.session
event = 'lock-%s/%s' % (self.schema, self.table)
session = x84.bbs.session.getsession()
while True:
session.send_event(event, ('acquire', stale))
data = session.read_event(event)
if data is True or not blocking:
return data
time.sleep(0.1)
