NAME

KiokuDB::Entry - An entry in the database

SYNOPSIS

    KiokuDB::Entry->new(
        id => ...,
        data => ...
    );

DESCRIPTION

This object provides the meta data for a single storage entry.

ATTRIBUTES

id

The UUID for the entry.

If there is no ID then the entry is intrinsic.

root

Whether or not this is a member of the root set (not subject to garbage collection, because storage was explicitly requested).

data

A simplified data structure modeling this object/reference. This is a tree, not a graph, and has no shared data (JSON compliant). All references are symbolic, using a KiokuDB::Reference object with UIDs as the address space.

class

If the entry is blessed, this contains the class of that object.

In the future this might be a complex structure for anonymous classes, e.g. the class and the runtime roles.

tied

One of HASH, ARRAY, SCALAR or GLOB.

data is assumed to be a reference or an intrinsic entry for the object driving the tied structure (e.g. the tied(%hash)).

prev

Contains a link to a KiokuDB::Entry objects that precedes this one.

The last entry that was loaded from the store, or successfully written to the store for a given UUID is kept in the live object set.

The collapser creates transient Entry objects, which if written to the store successfully are replace the previous one.

backend_data

Backends can use this to store additional meta data as they see fit.

For instance, this is used in the CouchDB backend to track entry revisions for the opportunistic locking, and in KiokuDB::Backend::BDB::GIN to to store extracted keys.