Package edu.cornell.mannlib.vitro.webapp.dao.jena

Class VClassGroupCache

java.lang.Object

edu.cornell.mannlib.vitro.webapp.dao.jena.VClassGroupCache

All Implemented Interfaces:

SearchIndexer.Listener

public class VClassGroupCache
extends Object
implements SearchIndexer.Listener

This is a cache of classgroups with classes. Each class should have a count of individuals. These counts are cached so they don't have to be recomputed. The cache is updated asynchronously by the thread RebuildGroupCacheThread. A synchronous rebuild can be performed with VClassGroupCache.doSynchronousRebuild() This class should handle the condition where the search engine is not available. It will not throw an exception but it will return a empty list of classes or class groups. VClassGroupCache.doSynchronousRebuild() and the RebuildGroupCacheThread will try to connect to the search engine a couple of times and then give up. As of VIVO release 1.4, the counts come from the search index. If the search index is not built or if there were problems building the index, the class counts from VClassGroupCache will be incorrect.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	VClassGroupCache.RebuildGroupCacheThread
static class	VClassGroupCache.Setup
protected class	VClassGroupCache.VClassGroupCacheChangeListener	Listen for changes to what class group classes are in and their display rank.

Method Summary

Modifier and Type	Method	Description
protected static void	addClassCountsToGroup(VClassGroup group, SearchEngine searchEngine)
protected static void	addCountsUsingSearch(List<VClassGroup> groups, SearchEngine searchEngine)	Add the Individual count to classes in groups.
protected static Map<String,VClass>	classMapForGroups(List<VClassGroup> groups)
void	doSynchronousRebuild()
VClass	getCachedVClass(String classUri)
VClassGroup	getGroup(String vClassGroupURI)
List<VClassGroup>	getGroups()
protected VClassGroupDao	getVCGDao()
static VClassGroupCache	getVClassGroupCache(javax.servlet.ServletContext sc)	Use getVClassGroupCache(ServletContext) to get a VClassGroupCache.
static VClassGroupsForRequest	getVClassGroups(javax.servlet.http.HttpServletRequest req)	Use getVClassGroups(HttpServletRequest) to get a language-aware image of the cached groups and classes.
protected static boolean	isClassNameChange(org.apache.jena.rdf.model.Statement stmt, org.apache.jena.ontology.OntModel jenaOntModel)
void	pause()
protected static void	rebuildCacheUsingSearch(VClassGroupCache cache)	Method that rebuilds the cache.
void	receiveSearchIndexerEvent(SearchIndexer.Event event)	Handle notification of events from the IndexBuilder.
void	requestCacheUpdate()
protected void	requestStop()
protected void	setCache(List<VClassGroup> newGroups, Map<String,VClass> classMap)
protected static void	setClassCount(VClassGroup group, String classUri, long individualsInClass)
void	unpause()

Methods inherited from class java.lang.Object

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

Method Detail

getGroup

public VClassGroup getGroup(String vClassGroupURI)

getGroups

public List<VClassGroup> getGroups()

getCachedVClass

public VClass getCachedVClass(String classUri)

setCache

protected void setCache(List<VClassGroup> newGroups,
                        Map<String,VClass> classMap)

pause

public void pause()

unpause

public void unpause()

requestCacheUpdate

public void requestCacheUpdate()

requestStop

protected void requestStop()

getVCGDao

protected VClassGroupDao getVCGDao()

doSynchronousRebuild

public void doSynchronousRebuild()

receiveSearchIndexerEvent

public void receiveSearchIndexerEvent(SearchIndexer.Event event)

Handle notification of events from the IndexBuilder.

Specified by:

receiveSearchIndexerEvent in interface SearchIndexer.Listener

getVClassGroupCache

public static VClassGroupCache getVClassGroupCache(javax.servlet.ServletContext sc)

Use getVClassGroupCache(ServletContext) to get a VClassGroupCache.

getVClassGroups

public static VClassGroupsForRequest getVClassGroups(javax.servlet.http.HttpServletRequest req)

Use getVClassGroups(HttpServletRequest) to get a language-aware image of the cached groups and classes.

rebuildCacheUsingSearch

protected static void rebuildCacheUsingSearch(VClassGroupCache cache)
                                       throws SearchEngineException

Method that rebuilds the cache. This will use a WebappDaoFactory and a SearchEngine.

Throws:

SearchEngineException

classMapForGroups

protected static Map<String,VClass> classMapForGroups(List<VClassGroup> groups)

addCountsUsingSearch

protected static void addCountsUsingSearch(List<VClassGroup> groups,
                                           SearchEngine searchEngine)
                                    throws SearchEngineException

Add the Individual count to classes in groups.

Throws:

SearchEngineException

addClassCountsToGroup

protected static void addClassCountsToGroup(VClassGroup group,
                                            SearchEngine searchEngine)
                                     throws SearchEngineException

Throws:

SearchEngineException

setClassCount

protected static void setClassCount(VClassGroup group,
                                    String classUri,
                                    long individualsInClass)

isClassNameChange

protected static boolean isClassNameChange(org.apache.jena.rdf.model.Statement stmt,
                                           org.apache.jena.ontology.OntModel jenaOntModel)