entitytxn.protocols
Protocols and multimethods for interfacing transaction
events to actions.
TxnEvents
protocol
Link transaction events to implementations
members
create-entity
(create-entity txn-event entity-val)
A new, as yet unmanaged domain instance is being created in the
transaction. Returns the instance to be created when the transaction
commits.
delete-entity
(delete-entity txn-event entity-val)
Delete the instance in its backing store.
destroy-entity
(destroy-entity txn-event entity-val)
An existing, manged instance is being deleted in the
transaction.
identity-of
(identity-of txn-event entity-val)
Return the identity of the given value. If the argument is
the identity itself then return that. If the identity cannot
be determined then throws. An identity must be unique across
participating instances.
mutate-entity
(mutate-entity txn-event old-val new-val)
An existing instance is being mutated. This event occurs during
the commit phase and notifies the domain so that it may validate,
veto by an exception or make further domain changes in the transaction.
Returns the current in-transaction value.
new-instance
(new-instance txn-event args)
Return a new, unmanaged domain prototype.
read-entity
(read-entity txn-event key-val args)
Read none, one or more entity instances from their backing store
by applying key-val and optional args.
write-entity
(write-entity txn-event entity-val)
Write the given instance to its backing store.