org.transitime.db.hibernate

Class HibernateUtils

java.lang.Object

org.transitime.db.hibernate.HibernateUtils

public class HibernateUtils
extends java.lang.Object

Utilities for dealing with Hibernate issues such as sessions.

Author:

SkiBu Smith

Field Summary

Fields

Modifier and Type	Field and Description
static int	BATCH_SIZE
static int	DEFAULT_ID_SIZE
static org.slf4j.Logger	logger

Constructor Summary

Constructors

Constructor and Description
HibernateUtils()

Method Summary

Modifier and Type	Method and Description
static void	clearSessionFactory() Clears out the session factory so that a new one will be created for the dbName.
static org.hibernate.Session	getSession() Returns the session for the database name specified by the transitime.db.dbName Java property.
static org.hibernate.Session	getSession(java.lang.String agencyId) Returns session for the specified agencyId.
static org.hibernate.SessionFactory	getSessionFactory(java.lang.String agencyId) Returns a cached Hibernate SessionFactory.
static int	sizeof(java.lang.Object obj) Determines the size of a serializable object by serializing it in memory and then measuring the resulting size in bytes.

Methods inherited from class java.lang.Object

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

Field Detail

BATCH_SIZE

public static final int BATCH_SIZE

See Also:

Constant Field Values

DEFAULT_ID_SIZE

public static final int DEFAULT_ID_SIZE

See Also:

Constant Field Values

logger

public static final org.slf4j.Logger logger

Constructor Detail

HibernateUtils

public HibernateUtils()

Method Detail

getSessionFactory

public static org.hibernate.SessionFactory getSessionFactory(java.lang.String agencyId)
                                                      throws org.hibernate.HibernateException

Returns a cached Hibernate SessionFactory. Returns null if there is a problem.

Parameters:

agencyId - Used as the database name if the property transitime.core.dbName is not set

Returns:

Throws:

org.hibernate.HibernateException

clearSessionFactory

public static void clearSessionFactory()

Clears out the session factory so that a new one will be created for the dbName. This way new db connections are made. This is useful for dealing with timezones and postgres. For that situation want to be able to read in timezone from db so can set default timezone. Problem with postgres is that once a factory is used to generate sessions the database will continue to use the default timezone that was configured at that time. This means that future calls to the db will use the wrong timezone! Through this function one can read in timezone from database, set the default timezone, clear the factory so that future db connections will use the newly configured timezone, and then successfully process dates.

getSession

public static org.hibernate.Session getSession(java.lang.String agencyId)
                                        throws org.hibernate.HibernateException

Returns session for the specified agencyId.

NOTE: Make sure you close the session after the query!! Use a try/catch around the query and close the session in a finally block to make sure it happens. The system only gets a limited number of sessions!!

Parameters:

agencyId - Used as the database name if the property transitime.core.dbName is not set

Returns:

The Session. Make sure you close it when done because system only gets limited number of open sessions.

Throws:

org.hibernate.HibernateException

getSession

public static org.hibernate.Session getSession()

Returns the session for the database name specified by the transitime.db.dbName Java property.

NOTE: Make sure you close the session after the query!! Use a try/catch around the query and close the session in a finally block to make sure it happens. The system only gets a limited number of sessions!!

Returns:

The Session. Make sure you close it when done because system only gets limited number of open sessions.

sizeof

public static int sizeof(java.lang.Object obj)

Determines the size of a serializable object by serializing it in memory and then measuring the resulting size in bytes.

Parameters:

obj - Object to be serialized

Returns:

Size of serialized object in bytes or -1 if object cannot be serialized