def deref(self):
"""Returns either the in-transaction-value of this ref if
there is an active transaction, or returns the last committed
value of ref"""
transaction = LockingTransaction.get()
if transaction:
return transaction.getRef(self)
return self._currentVal()
def deref(self):
"""Returns either the in-transaction-value of this ref if
there is an active transaction, or returns the last committed
value of ref"""
transaction = LockingTransaction.get()
if transaction:
return transaction.getRef(self)
return self._currentVal()
def touch(self):
"""Ensures that this ref cannot be given a new
in-transaction-value by any other transactions for the
duration of this transaction"""
LockingTransaction.ensureGet().doEnsure(self)
def commute(self, fn, args):
"""Commutes the value of this ref, allowing for it to be
updated by other transactions before the commuting function is
called"""
return LockingTransaction.ensureGet().doCommute(self, fn, args)
def alter(self, fn, args):
"Alters the value of this ref, and returns the new state"
current = LockingTransaction.ensureGet().getRef(self)
return self.refSet(fn(*RT.cons(current, args)))
def refSet(self, state):
"""Sets the value of this ref to the desired state, regardless
of the current value. Returns the newly set state"""
return LockingTransaction.ensureGet().doSet(self, state)
def touch(self):
"""Ensures that this ref cannot be given a new
in-transaction-value by any other transactions for the
duration of this transaction"""
LockingTransaction.ensureGet().doEnsure(self)
def commute(self, fn, args):
"""Commutes the value of this ref, allowing for it to be
updated by other transactions before the commuting function is
called"""
return LockingTransaction.ensureGet().doCommute(self, fn, args)
def alter(self, fn, args):
"Alters the value of this ref, and returns the new state"
current = LockingTransaction.ensureGet().getRef(self)
return self.refSet(fn(*RT.cons(current, args)))
def refSet(self, state):
"""Sets the value of this ref to the desired state, regardless
of the current value. Returns the newly set state"""
return LockingTransaction.ensureGet().doSet(self, state)
