Design and architecture of Apache Jackrabbit

Jukka Zitting

Jackrabbit committer

Agenda

• Components structure

• Internal extension points

• Configuration

• Item states

• Clustering

• Indexing

• Future ideas, NGP

Component structure

core

jcr-com.

rmi

api spi

spi-com.

spi2jcr

jcr2spitests

text

webdav

jca

webapp

ocm-ntmocm

Internal extension points

• PersistenceManager

• AccessManager

• SearchIndex

• DataStore

• FileSystem

Configuration

• XML files– repository.xml– workspace.xml

• Fixed structure– With <param/> entries

• Replace with IoC?

Item states

• NodeState, PropertyState

• Managed by an ItemStateManager– Shared– Local/Session– Virtual

• Replace with Bundles?

Clustering

• Shared persistence manager

• Journal to coordinate cluster nodes– Observation/indexing– Locking– Node type changes– Etc.

Indexing

• Default implementation based on Lucene

• Full text + “accurate” matches

• Single index per workspace (+ version store)

• Configurable (many new features in 1.4)

Future ideas, NGP

• Append-only storage– Inspired by MVCC, Subversion, etc.– No updates or removes– Garbage collection

• Optimized for read-only, no refresh!

• Concurrent transactions!

• Point in time recovery

Comments / Questions ?