KiokuDB::Set - Set::Object wrapper for KiokuDB with lazy loading.

    use KiokuDB::Util qw(set);

    my $set = set(); # KiokuDB::Set::Transient

    $set->insert($object);

    warn $set->size;

    my $id = $dir->store( $set );

This role defines the API implemented by KiokuDB::Set::Transient, KiokuDB::Set::Deferred, and KiokuDB::Set::Loaded.

These three classes are modeled after Set::Object, but have implementation details specific to KiokuDB.

Transient sets are in memory, they are sets that have been constructed by the user for subsequent insertion into storage.

When you create a new set, this is what you should use.

KiokuDB::Util provides convenience functions (set in KiokuDB::Util and weak_set in KiokuDB::Util) to construct transient sets concisely.

When a set is loaded from the backend, it is deferred by default. This means that the objects inside the set are not yet loaded, and will be fetched only as needed.

When set members are needed, the set is upgraded in place into a KiokuDB::Set::Loaded object.

This is the result of vivifying the members of a deferred set, and is similar to transient sets in implementation.