/path/to/content - the Apache Jackrabbit content repository
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The document outlines the Apache Jackrabbit content repository, including its repository model, property and node types, session management, access control, search capabilities, and persistence options. It details common node types, versioning features, and deployment configurations, providing insights into the repository's structure and functionality. Access control mechanisms, clustering, and configuration aspects are also highlighted to ensure effective deployment and management of the repository.
![Node structure
Property name Type Value
jcr:primaryType Name nt:unstructured
jcr:mixinTypes Name[] mix:referenceable
jcr:uuid String c6d27a10-bf23-11e3-b…
title String My new node
author String Jukka Zitting
Child nodes
foo, bar, baz[1], baz[2]](https://image.slidesharecdn.com/path-to-content-20-20the-20apache-20jackrabbit-20content-20repository-140408172851-phpapp02/85/path-to-content-the-Apache-Jackrabbit-content-repository-7-320.jpg)
![Common node types
nt:base
- jcr:primaryType: Name
- jcr:mixinTypes: Name[]
nt:unstructured
- * (any properties OK)
+ * (any child nodes OK)
oak:Unstructured (w/o order)
- * (any properties OK)
+ * (any child nodes OK)
mix:referenceable
- jcr:uuid: String
mix:versionable
- …
mix:lockable
- …](https://image.slidesharecdn.com/path-to-content-20-20the-20apache-20jackrabbit-20content-20repository-140408172851-phpapp02/85/path-to-content-the-Apache-Jackrabbit-content-repository-11-320.jpg)
![Search examples
// find all PDF files within this workspace, most recent first
SELECT * FROM [nt:file]
WHERE [jcr:mimeType] = ‘application/pdf’
ORDER BY [jcr:lastModified] DESC
// find all content about Christmas within my blog
/jcr:root/sites/myblog//*[jcr:contains(., ‘Christmas’)]](https://image.slidesharecdn.com/path-to-content-20-20the-20apache-20jackrabbit-20content-20repository-140408172851-phpapp02/85/path-to-content-the-Apache-Jackrabbit-content-repository-24-320.jpg)
/path/to/content - the Apache Jackrabbit content repository
- 1. /path/to/content the Apache Jackrabbit content repository
- 2. Outline • Repository model • Property and node types • Sessions and namespaces • References and versioning • Search and observation • Access control • Persistence and clustering • Deployment and configuration • Questions?
- 4. Repository structure Repository Workspace A Workspace B Workspace C /jcr:system
- 5. … or more commonly Repository default workspace /jcr:system
- 6. Workspace structure Root node / /jcr:systemNode /a Node /a/cNode /a/b a b c jcr:system
- 7. Node structure Property name Type Value jcr:primaryType Name nt:unstructured jcr:mixinTypes Name[] mix:referenceable jcr:uuid String c6d27a10-bf23-11e3-b… title String My new node author String Jukka Zitting Child nodes foo, bar, baz[1], baz[2]
- 8. Property and node types
- 9. Common property types Property type Used for Examples String Short to medium-sized text “foo”, “This paragraph…” Binary Binary data and long text PNG, PDF, “This book…” Name Node and property names “nt:folder”, “content” Path Node and property paths “/jcr:system”, “/etc/map” Boolean, Long, Double Scalar data true, 0, -2846, 3.14, NaN Date ISO 8601 timestamp 2014-04-08T12:00:00.000Z Reference Graph structures c6d27a10-bf23-11e3-b…
- 10. Multi-valued properties • Zero or more values • Limit at around 10-100k values, depending on size of values • All values must be of the same type • Duplicates allowed • No “null” values • Automatically removed • Order is preserved
- 11. Common node types nt:base - jcr:primaryType: Name - jcr:mixinTypes: Name[] nt:unstructured - * (any properties OK) + * (any child nodes OK) oak:Unstructured (w/o order) - * (any properties OK) + * (any child nodes OK) mix:referenceable - jcr:uuid: String mix:versionable - … mix:lockable - …
- 12. Common node types, cont. nt:hierarchyNode (abstract) - jcr:created: Date nt:file + jcr:content nt:folder + *: nt:hierarchyNode nt:resource - jcr:data: Binary - jcr:mimeType: String - jcr:lastModified: Date
- 16. Session • All content access goes through a session • Sessions are created with an authenticated login() call • Session-based authorization of reads, writes and other operations • Tracking of transient changes • Atomic save() • Not thread-safe! • for concurrent operations, use multiple sessions
- 17. Namespaces • The repository has a set of prefix -> URI namespace mappings jcr: http://www.jcp.org/jcr/1.0 nt: http://www.jcp.org/jcr/nt/1.0 mix: http://www.jcp.org/jcr/mix/1.0 xml: http://www.w3.org/XML/1998/namespace etc. • Used to prevent naming conflicts between different clients • Each session can override (non-default) mappings locally • designed for cases like XML imports, etc. • in practice seldom used, and often not recommended
- 19. mix:referenceable - jcr:uuid = c6d27a10-bf23-11e3-b1b6-0800200c9a66 References - seeAlso = c6d27a10-bf23-11e3-b…
- 20. References, cont. • hard references • enforced integrity; target can not be removed • least flexibility; think twice before using • weak references • remains valid across moves/renames • paths, names, URLs, etc. • no backreferences
- 22. Versioning, cont. • To make a node versionable, add the mix:versionable mixin • scope of “versionability” determined by node types (OPV) • A checkin freezes a piece of content and makes a copy of it in the version history • A checkout unfreezes the content and allows it be modified • A restore goes back in time to a previously checked in version • A merge combines changes from another workspace to those made in this workspace
- 24. Search examples // find all PDF files within this workspace, most recent first SELECT * FROM [nt:file] WHERE [jcr:mimeType] = ‘application/pdf’ ORDER BY [jcr:lastModified] DESC // find all content about Christmas within my blog /jcr:root/sites/myblog//*[jcr:contains(., ‘Christmas’)]
- 25. Search • By default all content is indexed • Configurable per repository • Support for full text search • Also binaries indexed with automatic text extraction • Full access control of search results • However: • Limited join support/performance • No facets or aggregate queries
- 26. Observation • An observation listener can select to receive events • on changes of specified types • on changes at or below a specified path • on changes at nodes with specified identifiers • on changes at nodes of specified types • The events are delivered in asynchronous callbacks • Remember the non-thread-safety of sessions! • Often used to maintain a cache of expensive-to-compute data
- 27. Access control
- 28. Access control • Fine-grained, ACL-based access control • Applies to all content accesses • Writes • Reads • Search • Observation • etc. • Support for custom privileges • e.g. an “execute” privilege
- 30. Persistence managers Repository Workspace A Workspace B Workspace C /jcr:system Persistence Manager 1 Persistence Manager 2 Persistence Manager 3 Persistence Manager 4
- 31. Persistence alternatives Embedded Database PM Derby, H2 External Database PM PostgreSQL, Oracle, etc.
- 32. Data store Repository Workspace A /jcr:system Persistence Manager 1 Persistence Manager 2 Data Store
- 33. Data store alternatives File Data Store Local FS, NFS Database Data Store S3 Data Store PostgreSQL, Oracle, etc. S3
- 36. Deployment packages • jackrabbit-webapp • basic web interface (still no content browser/editor) • exposes the repository through JNDI, WebDAV, RMI • jackrabbit-standalone • runnable jar • jackrabbit-webapp plus embedded Jetty • basic tooling: backup/migration, CLI, etc. • jackrabbit-jca • designed for full J2EE environments • support for managed transactions
- 37. Embedded deployment • jackrabbit-core plus all dependencies • Maven recommended • slf4j used for logging • Full control over the repository • Extra work to make the repository externally manageable
- 38. Repository configuration • repository.xml • main repository configuration file • security, clustering, data store, /jcr:system, etc. • workspace.xml • configuration of each workspace • persistence manager, search index, etc. • automatically created based on template in repository.xml • indexing_configuration.xml • optional, customizes the search index • see http://jackrabbit.apache.org/jackrabbit-configuration.html
- 39. Questions?