Package org.modeshape.jcr.federation.spi

This package provides a Service Provider Interface (SPI) for connectors to external systems.

See:
Description

Interface Summary

DocumentChanges	Interface which encapsulates the changes that occurred on a document during an update process.
DocumentChanges.ChildrenChanges	Interface which encapsulates the changes to a document's children during an update operation.
DocumentChanges.MixinChanges	Interface which encapsulates the changes to a document's mixins during an update operation.
DocumentChanges.ParentChanges	Interface which encapsulates the changes to a document's parents during an update operation.
DocumentChanges.PropertyChanges	Interface which encapsulates the changes to a document's properties during an update operation.
DocumentChanges.ReferrerChanges	Interface which encapsulates the changes to a document's referrers during an update operation.
DocumentReader	A reader which can be used read the structure of Document instances and expose the underlying information.
DocumentWriter	A writer which can create and manipulate the structure of EditableDocument instances, that should be used by connectors when they want to return the information regarding external nodes.
ExtraPropertiesStore	Store for extra properties, which a Connector implementation can use to store and retrieve "extra" properties on a node that cannot be persisted in the external system.
Pageable	Marker interface that should be implemented by Connector(s) that want to expose children of nodes in a "page by page" fashion.
PageWriter	A type of document writer that can add paging information to documents.

Class Summary

Connector	SPI of a generic external connector, representing the interface to an external system integrated with ModeShape.
PageKey	The key used to uniquely identify a page of children.
ReadOnlyConnector	A specialized abstract Connector class that is readable and can never update content.
WritableConnector	A specialized abstract Connector class that is support both reads and writes.

Exception Summary

ConnectorException

Exception class that can be thrown either by Connector implementations or in other exceptional cases involving federation operations.

Package org.modeshape.jcr.federation.spi Description

This package provides a Service Provider Interface (SPI) for connectors to external systems. The ModeShape federation system uses these Connector implementations to enable a repository to access external systems and project the external information as structured nodes within the repository. External sources are configured in the repository configuration JSON file to use a specific Connector implementation (including connector-specific configuration properties), while the projections that define how and where the external content is bound into the repository content are created using the FederationManager:

 javax.jcr.Session jcrSession = ...
 Session session = (org.modeshape.jcr.api.Session)jcrSession;
 FederationManager fedMgr = session.getWorkspace().getFederationManager();
 
 javax.jcr.Node parentNode = ... // the parent of the federated content
 String parentPath = parentNode.getPath();
 String sourceName = ... // the name of the external source
 String externalPath = ... // the path of the node in the external source that is to appear as a child of 'parentNode'
 String alias = ... // Optional alias for the external node
 fedMgr.createExternalProjection(parentPath, sourceName, externalPath, alias);
 

To create a custom connector, simply create a Connector subclass and implement the necessary methods. If your connector is only to read information and never will update any external content, you can instead subclass the ReadOnlyConnector class, which implements the methods used to create/update/delete content by throwing the proper exception.