Difference between revisions of "Projects/Baloo"

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(Replaced content with "Baloo is a metadata and search framework for KDE. This page is now moved to [http://community.kde.org/Baloo/Architecture community.kde.org]")
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Baloo is a metadata and search framework for KDE.
Baloo is a metadata and search framework for KDE.
'''Mailing List: ''' kde-devel@kde.org <br/>
This page is now moved to [http://community.kde.org/Baloo/Architecture community.kde.org]
'''IRC Channel:''' #baloo on freenode
== Architecture ==
Baloo focuses on decentralization of data, and does not have any central database. At its core it is a set of 3 services -
* Data Stores
* Search Stores
* Relations
=== Data Store ===
A Data Store is a place to permanently store data. Its format and APIs are not dictated by Baloo, and can in any way that is most efficient for the data in question.
=== Search Store ===
A Search Store is a plugin which provides search capabilities for a specific kind of data. Each of these stores provide a plugin which can be used to search through the data using a consistent API. At this moment there are 3 search stores that have been implemented -
* File Search
* Email Search
* Contact Search
Each Store can also provide custom APIs for searching the data.
=== Relations ===
Baloo can be used to create relations between two uniquely identifiable identifiers. The key aspect is that when creating a relation between A and B, both of them are uniquely identifiable. For most of the PIM data, Akonadi already provides a unique identifier of the 'akonadi:?item=x'. For File data, Baloo provides unique identifiers of the form 'file:x'.
Each relation is stored in an independent store in the desired mechanism. A sample sqlite implementation is provided which maps both the identifiers in a 2 column sqlite database.
For example, there exists a TagRelation which maps a Tag and any unique identifier. Similarly, there can be an ActivityRelation, and relations for other aspects such as mapping a file received via Bluetooth to a Bluetooth device.
== Implementation ==
=== Files ===
Baloo concentrates heavily on files, and provides both a data store and search store for files. These are stored using a combination of sqlite and xapian.
=== Akonadi ===
In the case of PIM, since Akonadi already stores (caches) the data, only a Search Store is required. There are currently separate search stores for contacts and emails. They are both implemented using Xapian.
=== Tags ===
Tags are stored in a custom format. In order to relate tags with files / email, a TagRelation is provided.

Latest revision as of 15:40, 18 January 2014

Baloo is a metadata and search framework for KDE.

This page is now moved to community.kde.org

This page was last edited on 18 January 2014, at 15:40. Content is available under Creative Commons License SA 4.0 unless otherwise noted.