public static Db4objects.Drs.Db4o.ReplicationRecord QueryForReplicationRecord(ObjectContainerBase
container, Transaction trans, Db4oDatabase younger, Db4oDatabase older)
{
container.ShowInternalClasses(true);
try
{
IQuery q = container.Query(trans);
q.Constrain(typeof(Db4objects.Drs.Db4o.ReplicationRecord));
q.Descend("_youngerPeer").Constrain(younger).Identity();
q.Descend("_olderPeer").Constrain(older).Identity();
IObjectSet objectSet = q.Execute();
if (objectSet.HasNext())
{
Db4objects.Drs.Db4o.ReplicationRecord replicationRecord = (Db4objects.Drs.Db4o.ReplicationRecord
)objectSet.Next();
container.Activate(replicationRecord, int.MaxValue);
return(replicationRecord);
}
return(null);
}
finally
{
container.ShowInternalClasses(false);
}
}
public static Db4objects.Drs.Db4o.ReplicationRecord BeginReplication(Transaction
transA, Transaction transB)
{
ObjectContainerBase peerA = transA.Container();
ObjectContainerBase peerB = transB.Container();
Db4oDatabase dbA = ((IInternalObjectContainer)peerA).Identity();
Db4oDatabase dbB = ((IInternalObjectContainer)peerB).Identity();
dbB.Bind(transA);
dbA.Bind(transB);
Db4oDatabase younger = null;
Db4oDatabase older = null;
if (dbA.IsOlderThan(dbB))
{
younger = dbB;
older = dbA;
}
else
{
younger = dbA;
older = dbB;
}
Db4objects.Drs.Db4o.ReplicationRecord rrA = QueryForReplicationRecord(peerA, transA
, younger, older);
Db4objects.Drs.Db4o.ReplicationRecord rrB = QueryForReplicationRecord(peerB, transB
, younger, older);
if (rrA == null)
{
if (rrB == null)
{
return(new Db4objects.Drs.Db4o.ReplicationRecord(younger, older));
}
rrB.Store(peerA);
return(rrB);
}
if (rrB == null)
{
rrA.Store(peerB);
return(rrA);
}
if (rrA != rrB)
{
peerB.ShowInternalClasses(true);
try
{
int id = peerB.GetID(transB, rrB);
peerB.Bind(transB, rrA, id);
}
finally
{
peerB.ShowInternalClasses(false);
}
}
return(rrA);
}
