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oracle.toplink.sessionbroker
Class SessionBroker

java.lang.Object
DatabaseSessionImpl
oracle.toplink.sessionbroker.SessionBroker

public class SessionBroker

extends DatabaseSessionImpl

Purpose: Provide a single view to a TopLink session that transparently accesses multple databases.

Responsibilities:

• Broker queries to the appropriate child sessions.
• Use a simplified two-stage commit policy on commit of transaction.
• Support brokered units of work.

See Also:

Serialized Form

Constructor Summary

SessionBroker()
PUBLIC: Create and return a session broker.

Method Summary

SessionBroker	acquireClientSessionBroker() PUBLIC: Return a session broker that behaves as a client session broker.
UnitOfWork	acquireUnitOfWork() PUBLIC: Return a unit of work for this session broker.
void	addDescriptor(Descriptor descriptor) PUBLIC: You cannot add a descriptor to a session broker, you must add it to its session.
void	addDescriptors(Project project) PUBLIC: You cannot add a project to a session broker, you must add it to its session.
void	addDescriptors(java.util.Vector descriptors) PUBLIC: You cannot add descriptors to a session broker, you must add them to its session.
boolean	containsQuery(java.lang.String queryName) PUBLIC: Return true if the pre-defined query is defined on the session.
AsOfClause	getAsOfClause() ADVANCED: Answers the past time this session is as of.
DatabaseQuery	getQuery(java.lang.String name) PUBLIC: Return the query from the session pre-defined queries with the given name.
DatabaseQuery	getQuery(java.lang.String name, java.util.Vector arguments) PUBLIC: Return the query from the session pre-defined queries with the given name and argument types.
Sequencing	getSequencing() PUBLIC: Return the Sequencing object used by the session.
void	initializeSequencing() ADVANCED: Creates sequencing object for the session broker.
boolean	isClientSessionBroker() PUBLIC: Return if this session is a client session broker.
boolean	isConnected() PUBLIC: Return if all sessions are still connected to the database.
boolean	isServerSessionBroker() PUBLIC: Return if this session is a server session broker.
void	login() PUBLIC: Connect to the database using the predefined login.
void	login(java.lang.String userName, java.lang.String password) PUBLIC: Connect to the database using the predefined login.
void	logout() PUBLIC: Disconnect from all databases.
void	registerSession(java.lang.String name, Session session) PUBLIC: Register the session under its name.
void	registerSession(java.lang.String name, Session session) PUBLIC: Register the session under its name.
void	release() PUBLIC: Release the session.
void	releaseClientSessionBroker() Deprecated. Since OracleAS TopLink 10g (10.0.3). Use release().
void	setIntegrityChecker(IntegrityChecker integrityChecker) PUBLIC: set the integrityChecker.
void	setLog(java.io.Writer log) PUBLIC: Set the message log.
void	setProfiler(SessionProfiler profiler) PUBLIC: Set the profiler for the session.
void	setSessionLog(SessionLog log) PUBLIC: Set the session log.
void	setShouldLogMessages(boolean shouldLog) Deprecated.

Methods inherited from class java.lang.Object

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

Constructor Detail

SessionBroker

public SessionBroker()

PUBLIC: Create and return a session broker. Because a session broker has multiple sessions it does not used a login.

Method Detail

acquireClientSessionBroker

public SessionBroker acquireClientSessionBroker()

PUBLIC: Return a session broker that behaves as a client session broker. An aquire session broker is done under the covers on each session inside the session broker, and a new broker is returned. NOTE: when finished with the client broker, it should be releases. See releaseClientSessionBroker.

acquireUnitOfWork

public UnitOfWork acquireUnitOfWork()

PUBLIC: Return a unit of work for this session broker. Acquire a client session broker if is a server session broker.

See Also:

UnitOfWork

addDescriptor

public void addDescriptor(Descriptor descriptor)

PUBLIC: You cannot add a descriptor to a session broker, you must add it to its session.

addDescriptors

public void addDescriptors(java.util.Vector descriptors)
                    throws ValidationException

PUBLIC: You cannot add descriptors to a session broker, you must add them to its session.

Throws:

ValidationException

addDescriptors

public void addDescriptors(Project project)
                    throws ValidationException

PUBLIC: You cannot add a project to a session broker, you must add it to its session.

Throws:

ValidationException

containsQuery

public boolean containsQuery(java.lang.String queryName)

PUBLIC: Return true if the pre-defined query is defined on the session.

getAsOfClause

public AsOfClause getAsOfClause()

ADVANCED: Answers the past time this session is as of. Only meaningfull for special historical sessions.

Returns:

An immutable object representation of the past time. null if no clause set, or this a regular session.

See Also:

oracle.toplink.expressions.AsOfClause, #acquireSessionAsOf(java.lang.Number), #acquireSessionAsOf(java.util.Date), #hasAsOfClause

getQuery

public DatabaseQuery getQuery(java.lang.String name)

PUBLIC: Return the query from the session pre-defined queries with the given name. This allows for common queries to be pre-defined, reused and executed by name.

getQuery

public DatabaseQuery getQuery(java.lang.String name,
                              java.util.Vector arguments)

PUBLIC: Return the query from the session pre-defined queries with the given name and argument types. This allows for common queries to be pre-defined, reused and executed by name. This method should be used if the Session has multiple queries with the same name but different arguments.

isClientSessionBroker

public boolean isClientSessionBroker()

PUBLIC: Return if this session is a client session broker.

isConnected

public boolean isConnected()

PUBLIC: Return if all sessions are still connected to the database.

isServerSessionBroker

public boolean isServerSessionBroker()

PUBLIC: Return if this session is a server session broker.

login

public void login()
           throws DatabaseException

PUBLIC: Connect to the database using the predefined login. This connects all of the child sessions and expects that they are in a valid state to be connected.

Throws:

DatabaseException

login

public void login(java.lang.String userName,
                  java.lang.String password)
           throws DatabaseException

PUBLIC: Connect to the database using the predefined login. This connects all of the child sessions and expects that they are in a valid state to be connected.

Throws:

DatabaseException

logout

public void logout()
            throws DatabaseException

PUBLIC: Disconnect from all databases.

Throws:

TopLinkException - if a transaction is active, you must rollback any active transaction before logout.

DatabaseException - the database will also raise an error if their is an active transaction, or a general error occurs.

registerSession

public void registerSession(java.lang.String name,
                            Session session)

PUBLIC: Register the session under its name. All of the session's descriptors must have already been registered. The session should not be connected and descriptors should not be initialized.

registerSession

public void registerSession(java.lang.String name,
                            Session session)

PUBLIC: Register the session under its name. All of the session's descriptors must have already been registered. The session should not be connected and descriptors should not be initialized.

release

public void release()

PUBLIC: Release the session. This does nothing by default, but allows for other sessions such as the ClientSession to do something.

releaseClientSessionBroker

public void releaseClientSessionBroker()

Deprecated. Since OracleAS TopLink 10g (10.0.3). Use release().

PUBLIC: Called on a client Session Broker. Releases all the client sessions held in this broker. Should be used in conjunction with acquireClientSessionBroker()

setIntegrityChecker

public void setIntegrityChecker(IntegrityChecker integrityChecker)

PUBLIC: set the integrityChecker. IntegrityChecker holds all the Descriptor Exceptions.

setSessionLog

public void setSessionLog(SessionLog log)

PUBLIC: Set the session log.

See Also:

#logMessages()

setLog

public void setLog(java.io.Writer log)

PUBLIC: Set the message log.

See Also:

#logMessages()

setProfiler

public void setProfiler(SessionProfiler profiler)

PUBLIC: Set the profiler for the session. This allows for performance operations to be profiled.

setShouldLogMessages

public void setShouldLogMessages(boolean shouldLog)

Deprecated.

Obsolete: Replaced by setLogLevel(int level, String category)

See Also:

#setLogLevel(int level, String category)

initializeSequencing

public void initializeSequencing()

ADVANCED: Creates sequencing object for the session broker. Typically there is no need for the user to call this method - it is called by login() and acquireClientSessionBroker.

getSequencing

public Sequencing getSequencing()

PUBLIC: Return the Sequencing object used by the session.

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