it.unimi.dico.islab.idbs2.cloud.session

Class CloudSessionManager

java.lang.Object

it.unimi.dico.islab.idbs2.cloud.session.CloudSessionManager

public class CloudSessionManager
extends Object

Class for Hibernate Session automatic management. This class offers only static methods, usually protected, for Hibernate session management which are used from other classes of this package.

N.B.: All the operations executed through manager classes will be exectued referring to this class's internal session

Author:

Vegeziel

Field Summary

Fields

Modifier and Type	Field and Description
static CloudEdgeManager	cem CloudEdgeManager reference, used to manage CloudEdge objects.
static CloudManager	cm CloudManager reference, used to manage Cloud objects.
static CloudNodeManager	cnm CloudNodeManager reference, used to manage CloudNode objects.

Method Summary

Methods

Modifier and Type	Method and Description
static void	beginTransaction() Start a new transaction for the internal Session.
protected static void	checkActiveTransaction() Check if the internal session has an active transaction, otherwise creates automatically a new transaction warning the user.
static void	commitTransaction() Commit the internal session active transaction.
protected static Session	getInternalSession()
static SessionFactory	getSessionFactory() Returns an Hibernate Session Factory created for this kc model.
static SessionFactory	getSessionFactory(File conf) Same as getSessionFactory().
protected static void	saveOrUpdateObject(Object obj) Give persistence (on relational database) to an object mapped with Hibernate using the internal Session Factory of this class.

Methods inherited from class java.lang.Object

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

Field Detail

cm

public static CloudManager cm

CloudManager reference, used to manage Cloud objects.

cnm

public static CloudNodeManager cnm

CloudNodeManager reference, used to manage CloudNode objects.

cem

public static CloudEdgeManager cem

CloudEdgeManager reference, used to manage CloudEdge objects.

Method Detail

saveOrUpdateObject

protected static void saveOrUpdateObject(Object obj)

Give persistence (on relational database) to an object mapped with Hibernate using the internal Session Factory of this class. This method is defined only in this class (as it is the main class of this package) and is called by every saveOrUpdate method of other classes of this package.

Parameters:

obj - The Hibernate mapped object to be persisted.

checkActiveTransaction

protected static void checkActiveTransaction()

Check if the internal session has an active transaction, otherwise creates automatically a new transaction warning the user.

beginTransaction

public static void beginTransaction()

Start a new transaction for the internal Session.

commitTransaction

public static void commitTransaction()

Commit the internal session active transaction. This method MUST be called if some KnowledgeChuks hava been saved or modified using internal session. Otherwise the saved data won't be materialized.

getSessionFactory

public static SessionFactory getSessionFactory()

Returns an Hibernate Session Factory created for this kc model. This Session Factory will be different at any call of this method and is different from the internal Session Factory used by other methods (e.g. saveOrUpdate and getKnowledgeChunkById).

This session factory is created using the config/kcDatabaseConfiguration.xml file.

Returns:

Hibernate SessionFactory

getSessionFactory

public static SessionFactory getSessionFactory(File conf)

Same as getSessionFactory(). Only difference is that the configuration file the SessionFactory will be built upon is passed as argument. This method can be used to obtain new SessionFactories for databases different from the standard one.

Parameters:

conf - the configuration file in a standard xml Hibernate version.

Returns:

the created SessionFactory.

getInternalSession

protected static Session getInternalSession()