Package org.projectbarbel.histo.extension

Class AbstractLazyLoadingListener<R,T>

java.lang.Object

org.projectbarbel.histo.extension.AbstractLazyLoadingListener<R,T>

Type Parameters:

R - the data resource to access

T - the type stored in the resource

All Implemented Interfaces:

LazyLoadingListenerProtocol<R,T>

Direct Known Subclasses:

DefaultLazyLoadingListener

public abstract class AbstractLazyLoadingListener<R,T>
extends Object
implements LazyLoadingListenerProtocol<R,T>

Mongo shadow lazy loading listener implementation to pre-fetch saved data from previous sessions back to BarbelHisto.
The simple listener implementations provide support for all BarbelQueries and all custom queries as long they use the BarbelQueries.DOCUMENT_ID as a filter criterion. If you run an instance of BarbelHisto as global singleton in your application set-up, set the singletonContext flag to true. This will increase performance as data is the listener refuses to refresh data on each retrieve operation. This is safe, if only ever one BarbelHisto instance is using the accessed data resource.

Author:

Niklas Schlimm

Field Summary

Fields

Modifier and Type	Field	Description
protected String	documentIdFieldName
protected boolean	fullfetchAllowed
protected com.google.gson.Gson	gson
protected Class<?>	managedType
protected BarbelMode	mode
protected Class<?>	persistedType
protected R	shadow
protected boolean	singletonContext

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractLazyLoadingListener(Class<?> managedType, com.google.gson.Gson gson, boolean singletonContext, boolean fullfetchAllowed)

Method Summary

Modifier and Type	Method	Description
abstract String	fromStoredDocumentToPersistenceObjectJson(T document)
Bitemporal	fromStoreDocumentPersistenceObject(T document)
void	handleInitialization(EventType.BarbelInitializedEvent event)
void	handleInitializeJournal(EventType.InitializeJournalEvent event)
void	handleRetrieveData(EventType.RetrieveDataEvent event)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.projectbarbel.histo.extension.LazyLoadingListenerProtocol

getExternalDataResource, queryAll, queryJournal

Field Detail

managedType

protected final Class<?> managedType

persistedType

protected final Class<?> persistedType

mode

protected final BarbelMode mode

gson

protected final com.google.gson.Gson gson

singletonContext

protected final boolean singletonContext

fullfetchAllowed

protected final boolean fullfetchAllowed

documentIdFieldName

protected final String documentIdFieldName

shadow

protected R shadow

Constructor Detail

AbstractLazyLoadingListener

protected AbstractLazyLoadingListener(Class<?> managedType,
                                      com.google.gson.Gson gson,
                                      boolean singletonContext,
                                      boolean fullfetchAllowed)

Method Detail

handleInitialization

public void handleInitialization(EventType.BarbelInitializedEvent event)

Specified by:

handleInitialization in interface LazyLoadingListenerProtocol<R,T>

handleRetrieveData

public void handleRetrieveData(EventType.RetrieveDataEvent event)

Specified by:

handleRetrieveData in interface LazyLoadingListenerProtocol<R,T>

handleInitializeJournal

public void handleInitializeJournal(EventType.InitializeJournalEvent event)

Specified by:

handleInitializeJournal in interface LazyLoadingListenerProtocol<R,T>

fromStoreDocumentPersistenceObject

public Bitemporal fromStoreDocumentPersistenceObject(T document)

Specified by:

fromStoreDocumentPersistenceObject in interface LazyLoadingListenerProtocol<R,T>

fromStoredDocumentToPersistenceObjectJson

public abstract String fromStoredDocumentToPersistenceObjectJson(T document)