IndexingChangeListener (Vitro API 1.14.1 API)

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 Description

IndexingChangeListener(SearchIndexer searchIndexer)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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