edu.cornell.mannlib.vitro.webapp.searchindex

Class IndexingChangeListener

java.lang.Object

org.apache.jena.rdf.listeners.StatementListener

edu.cornell.mannlib.vitro.webapp.searchindex.IndexingChangeListener

All Implemented Interfaces:

SearchIndexer.Listener, org.apache.jena.rdf.model.ModelChangedListener

public class IndexingChangeListener
extends org.apache.jena.rdf.listeners.StatementListener
implements org.apache.jena.rdf.model.ModelChangedListener, SearchIndexer.Listener

When a change is heard, wait for an interval to see if more changes come in. When changes stop coming in for a specified interval, send what has accumulated. When the SearchIndexer pauses, stop sending changes until the SearchIndexer unpauses. If the SearchIndexer begins a rebuild, discard any changes that we had accumulated. They will be accomplished by the rebuild. ----------------------- When a changed statement is received, it should not be added to the list of pending changes. The elements of the statement hold references to the model in which they were created, as well as to other structures. Thus, an action that produces many changes to the models could become unscalable. To avoid this, we use the ResourceFactory to create a "sanitized" statement which is semantically equivalent to the original, and add that to the list instead. The original statement is released.

Constructor Summary

Constructors

Constructor and Description
IndexingChangeListener(SearchIndexer searchIndexer)

Method Summary

Modifier and Type	Method and Description
void	addedStatement(org.apache.jena.rdf.model.Statement stmt)
void	notifyEvent(org.apache.jena.rdf.model.Model model, Object event) We only care about events that signal the end of an edit operation.
void	receiveSearchIndexerEvent(SearchIndexer.Event event)
void	removedStatement(org.apache.jena.rdf.model.Statement stmt)
void	shutdown()

Methods inherited from class org.apache.jena.rdf.listeners.StatementListener

addedStatements, addedStatements, addedStatements, addedStatements, removedStatements, removedStatements, removedStatements, removedStatements

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.jena.rdf.model.ModelChangedListener

addedStatements, addedStatements, addedStatements, addedStatements, removedStatements, removedStatements, removedStatements, removedStatements

Constructor Detail

IndexingChangeListener

public IndexingChangeListener(SearchIndexer searchIndexer)

Method Detail

receiveSearchIndexerEvent

public void receiveSearchIndexerEvent(SearchIndexer.Event event)

Specified by:

receiveSearchIndexerEvent in interface SearchIndexer.Listener

shutdown

public void shutdown()

addedStatement

public void addedStatement(org.apache.jena.rdf.model.Statement stmt)

Specified by:

addedStatement in interface org.apache.jena.rdf.model.ModelChangedListener

Overrides:

addedStatement in class org.apache.jena.rdf.listeners.StatementListener

removedStatement

public void removedStatement(org.apache.jena.rdf.model.Statement stmt)

Specified by:

removedStatement in interface org.apache.jena.rdf.model.ModelChangedListener

Overrides:

removedStatement in class org.apache.jena.rdf.listeners.StatementListener

notifyEvent

public void notifyEvent(org.apache.jena.rdf.model.Model model,
                        Object event)

We only care about events that signal the end of an edit operation.

Specified by:

notifyEvent in interface org.apache.jena.rdf.model.ModelChangedListener

Overrides:

notifyEvent in class org.apache.jena.rdf.listeners.StatementListener