entitytxn.protocols — entity/entity-txn 0.1.4

Protocols and multimethods for interfacing transaction events to actions.

TxnEvents clj protocol

Link transaction events to implementations

create-entity clj

(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 clj

(delete-entity txn-event entity-val)

Delete the instance in its backing store.

destroy-entity clj

(destroy-entity txn-event entity-val)

An existing, manged instance is being deleted in the transaction.

identity-of clj

(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 clj

(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 clj

(new-instance txn-event args)

Return a new, unmanaged domain prototype.

read-entity clj

(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 clj

(write-entity txn-event entity-val)

Write the given instance to its backing store.