/*******************************************************************************
* Copyright (c) 1998, 2009 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Oracle - initial API and implementation from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.internal.sequencing;
import org.eclipse.persistence.sessions.server.ClientSession;
import org.eclipse.persistence.sessions.remote.RemoteSession;
import org.eclipse.persistence.internal.sessions.remote.RemoteConnection;
import org.eclipse.persistence.internal.sessions.AbstractSession;
import org.eclipse.persistence.internal.sessions.DatabaseSessionImpl;
import org.eclipse.persistence.sessions.broker.SessionBroker;
/**
* SequencingFactory is private to EclipseLink.
* It instantiates sequencing classes for sessions.
* It allows sequencing classes to be encapsulated in
* this package.
*
* @see ClientSessionSequencing
* @see RemoteConnectionSequencing
* @see SessionBrokerSequencing
* @see SequencingManager
*
*/
public class SequencingFactory {
/**
* INTERNAL:
* Takes a potential owner - a Session, returns Sequencing object.
* Note that before creating a Sequencing object there is a check performed
* to determine whether the object could be created.
*/
public static Sequencing createSequencing(AbstractSession session) {
Sequencing sequencing = null;
if (session.isClientSession()) {
ClientSession cs = (ClientSession)session;
if (ClientSessionSequencing.sequencingServerExists(cs)) {
sequencing = new ClientSessionSequencing(cs);
}
} else if (session.isRemoteSession()) {
RemoteConnection con = ((RemoteSession)session).getRemoteConnection();
if (RemoteConnectionSequencing.masterSequencingExists(con)) {
sequencing = new RemoteConnectionSequencing(con);
}
} else if (session.isBroker()) {
SessionBroker br = (SessionBroker)session;
if (SessionBrokerSequencing.atLeastOneSessionHasSequencing(br)) {
sequencing = new SessionBrokerSequencing(br);
}
}
return sequencing;
}
/**
* INTERNAL:
* Takes a potential owner - a DatabaseSession, returns SequencingHome object.
* Only DatabaseSession and ServerSession should be passed (not SessionBroker).
*/
public static SequencingHome createSequencingHome(DatabaseSessionImpl ownerSession) {
SequencingHome home = null;
if (!ownerSession.isBroker()) {
home = new SequencingManager(ownerSession);
}
return home;
}
}