The Optimistic Repository provides concurrent optimistic serializable transactions for embedded Sesame stores. It can replace the SailRepository within a Sesame configuration. When the AliBaba JARs are included in the console, additional configuration templates can be used with the create command, including optimistic-memory and optimistic-native (among others). The configuration templates that create ObjectRepositories also include the optimistic repository.
The optimistic repository is designed for small concurrent transactions. Although it also works for larger transactions, it is recommend to have exclusive access to the store during large transactions. Serializable transactions may throw a ConcurrencyException on commit, if the transaction cannot be committed, due to state changes within the repository. Applications that utilize the optimistic repository must be prepared for a ConcurrencyException when a transaction is committed.
Sesame 2.x does not support transaction isolation across HTTP and therefore the optimistic repository has no effect on remote clients and is only useful with embedded repositories.
