Published on February 18, 2014
External Data Provider
Mount external data External data visible in JCR tree Seen as normal nodes for any jahia service 2
ExternalDataSource API to connect to simple data sources Databases, filesystems, external APIs Create a mapping to JCR API Optional support for Search, write, lazy loading, … 3
Specify your mapping For every object : Associate a node type Map properties Define a path 4
Specify your mapping Decide a mapping for node type and properties 5
Specify your mapping Define a tree structure for your objects Should be able to find object from path and conversely ! Optionally, define a unique identifier 6
Implementation getItemByPath(path) getChildren(path) getItemByIdentifier(id) 7
Implementation ExternalData for each object Holds id, path, types, properties 8
Search One method search(query), with the user query QueryHelper to helps parse the query Use getSupportedNodeTypes() to return which types can be returned 9
Lazy loading Don’t need to load all properties values when getting node Instead, list properties names only And implement getPropertyValues(path,property) 10
Internationalization Internationalized properties returned per language Better use lazy properties to avoid getting all languages 11
Writeable Allows to save content directly in the provider Create, update, delete, move operations Called when using session.save() 12
Extendable properties Can add mixin and properties to nodes Extensions stored in the JCR All content transparently aggregated 13
Provider Factories Define a node type for a mount point Implements “ProviderFactory” Appears in the “mount” UI 14
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