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

Class CloudSessionManager

java.lang.Object

it.unimi.dico.islab.idbs2.common.AbstractSessionManager

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

public class CloudSessionManager
extends it.unimi.dico.islab.idbs2.common.AbstractSessionManager

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.

Fields inherited from class it.unimi.dico.islab.idbs2.common.AbstractSessionManager

cfgMan, configuration, internalSF, log

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.
static boolean	createDb() TODO: Scrivere guida!!
static Query	executeQuery(String query) Executes the HQL (Hibernate Query Language) query given as input using the internal session (requires an explicit call to beginTransaction()).
protected static Session	getInternalSession() Getter for the internal Hibernate Session.
static SessionFactory	getSessionFactory() Returns an Hibernate Session Factory created for this cloud model.
static SessionFactory	getSessionFactory(File confFile) Same as getSessionFactory().
static void	rollbackTransaction()
protected static void	saveOrUpdate(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 it.unimi.dico.islab.idbs2.common.AbstractSessionManager

_beginTransaction, _checkActiveTransaction, _commitTransaction, _createDb, _executeQuery, _flushTransaction, _getSessionFactory, _getSessionFactory, _initSessionFactory, _rollbackTransaction, _saveOrUpdateObject

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

executeQuery

public static Query executeQuery(String query)

Executes the HQL (Hibernate Query Language) query given as input using the internal session (requires an explicit call to beginTransaction()).

Parameters:

query - the HQL query to be executed. Only SELECT queries are accepted.

Returns:

A list of Objects as result of the query or null if no result has been returned.

saveOrUpdate

protected static void saveOrUpdate(Object obj)

Give persistence (on relational database) to an object mapped with Hibernate using the internal Session Factory of this class.

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.

getInternalSession

protected static Session getInternalSession()

Getter for the internal Hibernate Session.

Returns:

the hibernate Session managed by this class.

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 Cloud component have been saved or modified using internal session. Otherwise the saved data won't be materialized.

rollbackTransaction

public static void rollbackTransaction()

getSessionFactory

public static SessionFactory getSessionFactory()

Returns an Hibernate Session Factory created for this cloud 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 getCloudById).

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

Returns:

Hibernate SessionFactory

getSessionFactory

public static SessionFactory getSessionFactory(File confFile)

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:

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

Returns:

the created SessionFactory.

createDb

public static boolean createDb()

TODO: Scrivere guida!!

Throws:

SQLException