/* Copyright (C) 2004 - 2006 db4objects Inc. http://www.db4o.com
This file is part of the db4o open source object database.
db4o is free software; you can redistribute it and/or modify it under
the terms of version 2 of the GNU General Public License as published
by the Free Software Foundation and as clarified by db4objects' GPL
interpretation policy, available at
http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
Suite 350, San Mateo, CA 94403, USA.
db4o is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
package com.db4o.internal.replication;
import com.db4o.foundation.Hashtable4;
import com.db4o.internal.*;
/**
* @exclude
*/
public class MigrationConnection {
public final ObjectContainerBase _peerA;
public final ObjectContainerBase _peerB;
private final Hashtable4 _referenceMap;
private final Hashtable4 _identityMap;
public MigrationConnection(ObjectContainerBase peerA, ObjectContainerBase peerB) {
_referenceMap = new Hashtable4();
_identityMap = new Hashtable4();
_peerA = peerA;
_peerB = peerB;
}
public void mapReference(Object obj, ObjectReference ref) {
// FIXME: Identityhashcode is not unique
// ignored for now, since it is on most VMs.
// This should be fixed by adding
// putIdentity and getIdentity methods to Hashtable4,
// using the actual object as the parameter and
// checking for object identity in addition to the
// hashcode
_referenceMap.put(System.identityHashCode(obj), ref);
}
public void mapIdentity(Object obj, Object otherObj) {
_identityMap.put(System.identityHashCode(obj), otherObj);
}
public ObjectReference referenceFor(Object obj) {
int hcode = System.identityHashCode(obj);
ObjectReference ref = (ObjectReference) _referenceMap.get(hcode);
_referenceMap.remove(hcode);
return ref;
}
public Object identityFor(Object obj) {
int hcode = System.identityHashCode(obj);
return _identityMap.get(hcode);
}
public void terminate(){
_peerA.migrateFrom(null);
_peerB.migrateFrom(null);
}
public ObjectContainerBase peer(ObjectContainerBase stream){
if(_peerA == stream){
return _peerB;
}
return _peerA;
}
}