NAME

       KiokuDB::Backend::Role::TXN::Memory - In memory transactions.

VERSION

       version 0.57

SYNOPSIS

           with qw(KiokuDB::Backend::Role::TXN::Memory);

           sub commit_entries {
               my ( $self, @entries ) = @_;

               # atomically apply @entries

               # deleted entries have the deleted flag set
               # if an entry has no 'prev' entry it's an insert
               # otherwise it's an update
           }

DESCRIPTION

       This backend provides in memory transactions for backends which support atomic
       modification of data, but not full commit/rollback support.

       This backend works by buffering all operations in memory. Entries are kept alive allowing
       read operations go to the live entry even for objects that are out of scope.

       This implementation provides repeatable read level isolation. Durability, concurrency and
       atomicity are still the responsibility of the backend.

REQUIRED METHODS

       commit_entries
           Insert, update or delete entries as specified.

           This operation should either fail or succeed atomically.

           Entries with "deleted" should be removed from the database, entries with a "prev"
           entry should be inserted, and all other entries should be updated.

           Multiple entries may be given for a single object, for instance an object that was
           first inserted and then modified will have an insert entry and an update entry.

       get_from_storage
           Should be the same as "get" in KiokuDB::Backend.

           When no memory buffered entries are available for the object one is fetched from the
           backend.

       exists_in_storage
           Required as of KiokuDB version 0.37.

           A fallback implementation is provided, but should not be used and will issue a
           deprecation warning.

AUTHOR

       Yuval Kogman <nothingmuch@woobling.org>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2014 by Yuval Kogman, Infinity Interactive.

       This is free software; you can redistribute it and/or modify it under the same terms as
       the Perl 5 programming language system itself.