private void TstReferences()
{
Pilot pilot = new Pilot("tst References", 42);
A().Provider().StoreNew(pilot);
A().Provider().Commit();
StartReplication();
Pilot object1 = (Pilot)Next(A().Provider().GetStoredObjects(typeof(Pilot)).GetEnumerator
());
IReplicationReference reference = A().Provider().ProduceReference(object1, null,
null);
Assert.AreEqual(object1, reference.Object());
IDrsUUID uuid = reference.Uuid();
IReplicationReference ref2 = A().Provider().ProduceReferenceByUUID(uuid, typeof(Pilot
));
Assert.AreEqual(reference, ref2);
A().Provider().ClearAllReferences();
IDrsUUID db4oUUID = A().Provider().ProduceReference(object1, null, null).Uuid();
Assert.AreEqual(uuid, db4oUUID);
CommitReplication();
A().Provider().DeleteAllInstances(typeof(Pilot));
A().Provider().Commit();
}
private bool HandleNewObject(object obj, IReplicationReference ownerRef, IReplicationProviderInside
owner, IReplicationProviderInside other, object referencingObject, string fieldName
, bool needsToBeActivated, bool listenerAlreadyNotified)
{
if (_directionTo == owner)
{
return(false);
}
if (needsToBeActivated)
{
owner.Activate(obj);
}
if (!listenerAlreadyNotified)
{
_event.ResetAction();
_event.Conflict(false);
_event._creationDate = TimeStampIdGenerator.IdToMilliseconds(ownerRef.Uuid().GetLongPart
());
if (owner == _providerA)
{
_stateInA.SetAll(obj, true, false, ObjectStateImpl.Unknown);
_stateInB.SetAll(null, false, false, ObjectStateImpl.Unknown);
}
else
{
_stateInA.SetAll(null, false, false, ObjectStateImpl.Unknown);
_stateInB.SetAll(obj, true, false, ObjectStateImpl.Unknown);
}
if (_listener != null)
{
_listener.OnReplicate(_event);
if (_event._actionWasChosen)
{
if (_event._actionChosenState == null)
{
return(false);
}
if (_event._actionChosenState.GetObject() != obj)
{
return(false);
}
}
}
}
object counterpart = EmptyClone(owner, obj);
ownerRef.SetCounterpart(counterpart);
ownerRef.MarkForReplicating(true);
IReplicationReference otherRef = other.ReferenceNewObject(counterpart, ownerRef,
GetCounterpartRef(referencingObject), fieldName);
otherRef.SetCounterpart(obj);
PutCounterpartRef(obj, otherRef);
if (_event._actionShouldStopTraversal)
{
return(false);
}
return(true);
}
private object FindCounterpart(object value, IReplicationProviderInside sourceProvider
, IReplicationProviderInside targetProvider)
{
if (value == null)
{
return(null);
}
value = sourceProvider.ReplaceIfSpecific(value);
// TODO: need to clone and findCounterpart of each reference object in the
// struct
if (ReplicationPlatform.IsValueType(value))
{
return(value);
}
IReflectClass claxx = _reflector.ForObject(value);
if (claxx.IsArray())
{
return(ArrayClone(value, claxx, sourceProvider, targetProvider));
}
if (Platform4.IsTransient(claxx))
{
return(null);
}
// TODO: make it a warning
if (_reflector.IsValueType(claxx))
{
return(value);
}
if (_collectionHandler.CanHandle(value))
{
return(CollectionClone(value, claxx, sourceProvider, targetProvider));
}
//if value is a Collection, result should be found by passing in just the value
IReplicationReference @ref = sourceProvider.ProduceReference(value, null, null);
if (@ref == null)
{
throw new InvalidOperationException("unable to find the ref of " + value + " of class "
+ value.GetType());
}
object result = @ref.Counterpart();
if (result != null)
{
return(result);
}
IReplicationReference targetRef = targetProvider.ProduceReferenceByUUID(@ref.Uuid
(), value.GetType());
if (targetRef == null)
{
throw new InvalidOperationException("unable to find the counterpart of " + value
+ " of class " + value.GetType());
}
return(targetRef.Object());
}
private void DeleteInDestination(IReplicationReference reference, IReplicationProviderInside
destination)
{
if (!reference.IsMarkedForDeleting())
{
return;
}
destination.ReplicateDeletion(reference.Uuid());
}
public virtual void StoreReplica(object obj)
{
IReplicationReference @ref = GetCachedReference(obj);
if (@ref == null)
{
throw new Exception();
}
Store(obj, @ref.Uuid(), @ref.Version());
}
public virtual IReplicationReference ReferenceNewObject(object obj, IReplicationReference
counterpartReference, IReplicationReference unused, string unused2)
{
//System.out.println("referenceNewObject: " + obj + " UUID: " + counterpartReference.uuid());
IDrsUUID uuid = counterpartReference.Uuid();
long version = counterpartReference.Version();
if (GetObject(uuid) != null)
{
throw new Exception("Object exists already.");
}
IReplicationReference result = CreateReferenceFor(obj);
Store(obj, uuid, version);
return(result);
}
public virtual void Test()
{
SPCChild child = StoreInA();
Replicate();
IReplicationReference @ref = A().Provider().ProduceReference(child);
B().Provider().ClearAllReferences();
IDrsUUID expectedUuid = @ref.Uuid();
IReplicationReference referenceByUUID = B().Provider().ProduceReferenceByUUID(expectedUuid
, null);
Assert.IsNotNull(referenceByUUID);
IDrsUUID actualUuid = referenceByUUID.Uuid();
Assert.AreEqual(expectedUuid.GetLongPart(), actualUuid.GetLongPart());
}
public virtual IReplicationReference ReferenceNewObject(object obj, IReplicationReference
counterpartReference, IReplicationReference referencingObjCounterPartRef, string
fieldName)
{
IDrsUUID uuid = counterpartReference.Uuid();
if (uuid == null)
{
return(null);
}
byte[] signature = uuid.GetSignaturePart();
long longPart = uuid.GetLongPart();
long version = counterpartReference.Version();
Db4oDatabase db = _signatureMap.Produce(signature, 0);
Db4oReplicationReferenceImpl @ref = new Db4oReplicationReferenceImpl(obj, db, longPart
, version);
AddReference(@ref);
return(@ref);
}
private bool HandleMissingObjectInOther(object obj, IReplicationReference ownerRef
, IReplicationProviderInside owner, IReplicationProviderInside other, object referencingObject
, string fieldName)
{
bool isConflict = false;
bool wasModified = owner.WasModifiedSinceLastReplication(ownerRef);
if (wasModified)
{
isConflict = true;
}
if (_directionTo == other)
{
isConflict = true;
}
object prevailing = null;
//by default, deletion prevails
if (isConflict)
{
owner.Activate(obj);
}
_event.ResetAction();
_event.Conflict(isConflict);
_event._creationDate = TimeStampIdGenerator.IdToMilliseconds(ownerRef.Uuid().GetLongPart
());
long modificationDate = TimeStampIdGenerator.IdToMilliseconds(ownerRef.Version());
if (owner == _providerA)
{
_stateInA.SetAll(obj, false, wasModified, modificationDate);
_stateInB.SetAll(null, false, false, ObjectStateImpl.Unknown);
}
else
{
//owner == _providerB
_stateInA.SetAll(null, false, false, ObjectStateImpl.Unknown);
_stateInB.SetAll(obj, false, wasModified, modificationDate);
}
_listener.OnReplicate(_event);
if (isConflict && !_event._actionWasChosen)
{
ThrowReplicationConflictException();
}
if (_event._actionWasChosen)
{
if (_event._actionChosenState == null)
{
return(false);
}
if (_event._actionChosenState == _stateInA)
{
prevailing = _stateInA.GetObject();
}
if (_event._actionChosenState == _stateInB)
{
prevailing = _stateInB.GetObject();
}
}
if (prevailing == null)
{
//Deletion has prevailed.
if (_directionTo == other)
{
return(false);
}
ownerRef.MarkForDeleting();
return(!_event._actionShouldStopTraversal);
}
bool needsToBeActivated = !isConflict;
//Already activated if there was a conflict.
return(HandleNewObject(obj, ownerRef, owner, other, referencingObject, fieldName,
needsToBeActivated, true));
}
private bool PrepareObjectToBeReplicated(object obj, object referencingObject, string
fieldName)
{
//TODO Optimization: keep track of the peer we are traversing to avoid having to look in both.
Logger4Support.LogIdentity(obj);
_obj = obj;
_referencingObject = referencingObject;
_fieldName = fieldName;
IReplicationReference refA = _providerA.ProduceReference(_obj, _referencingObject
, _fieldName);
IReplicationReference refB = _providerB.ProduceReference(_obj, _referencingObject
, _fieldName);
if (refA == null && refB == null)
{
throw new Exception(string.Empty + _obj.GetType() + " " + _obj + " must be stored in one of the databases being replicated."
);
}
//FIXME: Use db4o's standard for throwing exceptions.
if (refA != null && refB != null)
{
throw new Exception(string.Empty + _obj.GetType() + " " + _obj + " cannot be referenced by both databases being replicated."
);
}
//FIXME: Use db4o's standard for throwing exceptions.
IReplicationProviderInside owner = refA == null ? _providerB : _providerA;
IReplicationReference ownerRef = refA == null ? refB : refA;
IReplicationProviderInside other = Other(owner);
IDrsUUID uuid = ownerRef.Uuid();
IReplicationReference otherRef = other.ProduceReferenceByUUID(uuid, _obj.GetType(
));
if (refA == null)
{
refA = otherRef;
}
else
{
refB = otherRef;
}
//TODO for circular referenced object, otherRef should not be null in the subsequent pass.
//But db4o always return null. A bug. check!
if (otherRef == null)
{
//Object is only present in one ReplicationProvider. Missing in the other. Could have been deleted or never replicated.
if (WasProcessed(uuid))
{
IReplicationReference otherProcessedRef = other.ProduceReferenceByUUID(uuid, _obj
.GetType());
if (otherProcessedRef != null)
{
ownerRef.SetCounterpart(otherProcessedRef.Object());
}
return(false);
}
MarkAsProcessed(uuid);
long creationTime = ownerRef.Uuid().GetLongPart();
if (creationTime > owner.TimeStamps().From())
{
//if it was created after the last time two ReplicationProviders were replicated it has to be treated as new.
if (_isReplicatingOnlyDeletions)
{
return(false);
}
return(HandleNewObject(_obj, ownerRef, owner, other, _referencingObject, _fieldName
, true, false));
}
else
{
// If it was created before the last time two ReplicationProviders were replicated it has to be treated as deleted.
// No, not always, in a three-way replication setup it can also be new.
return(HandleMissingObjectInOther(_obj, ownerRef, owner, other, _referencingObject
, _fieldName));
}
}
if (_isReplicatingOnlyDeletions)
{
return(false);
}
ownerRef.SetCounterpart(otherRef.Object());
otherRef.SetCounterpart(ownerRef.Object());
if (WasProcessed(uuid))
{
return(false);
}
//Has to be done AFTER the counterpart is set because object yet to be replicated might reference the current one, replicated previously.
MarkAsProcessed(uuid);
object objectA = refA.Object();
object objectB = refB.Object();
bool changedInA = _providerA.WasModifiedSinceLastReplication(refA);
//System.out.println("changedInA = " + changedInA);
bool changedInB = _providerB.WasModifiedSinceLastReplication(refB);
//System.out.println("changedInB = " + changedInB);
if (!changedInA && !changedInB)
{
return(false);
}
bool conflict = false;
if (changedInA && changedInB)
{
conflict = true;
}
if (changedInA && _directionTo == _providerA)
{
conflict = true;
}
if (changedInB && _directionTo == _providerB)
{
conflict = true;
}
object prevailing = _obj;
_providerA.Activate(objectA);
_providerB.Activate(objectB);
_event.ResetAction();
_event.Conflict(conflict);
_event._creationDate = TimeStampIdGenerator.IdToMilliseconds(uuid.GetLongPart());
_stateInA.SetAll(objectA, false, changedInA, TimeStampIdGenerator.IdToMilliseconds
(ownerRef.Version()));
_stateInB.SetAll(objectB, false, changedInB, TimeStampIdGenerator.IdToMilliseconds
(otherRef.Version()));
_listener.OnReplicate(_event);
if (conflict)
{
if (!_event._actionWasChosen)
{
ThrowReplicationConflictException();
}
if (_event._actionChosenState == null)
{
return(false);
}
if (_event._actionChosenState == _stateInA)
{
prevailing = objectA;
}
if (_event._actionChosenState == _stateInB)
{
prevailing = objectB;
}
}
else
{
if (_event._actionWasChosen)
{
if (_event._actionChosenState == _stateInA)
{
prevailing = objectA;
}
if (_event._actionChosenState == _stateInB)
{
prevailing = objectB;
}
if (_event._actionChosenState == null)
{
return(false);
}
}
else
{
if (changedInA)
{
prevailing = objectA;
}
if (changedInB)
{
prevailing = objectB;
}
}
}
IReplicationProviderInside prevailingPeer = prevailing == objectA ? _providerA :
_providerB;
if (_directionTo == prevailingPeer)
{
return(false);
}
if (!conflict)
{
prevailingPeer.Activate(prevailing);
}
//Already activated if there was a conflict.
if (prevailing != _obj)
{
otherRef.SetCounterpart(_obj);
otherRef.MarkForReplicating(true);
MarkAsNotProcessed(uuid);
_traverser.ExtendTraversalTo(prevailing);
}
else
{
//Now we start traversing objects on the other peer! Is that cool or what? ;)
ownerRef.MarkForReplicating(true);
}
return(!_event._actionShouldStopTraversal);
}
private void DeleteInDestination(IReplicationReference reference, IReplicationProviderInside
destination)
{
if (!reference.IsMarkedForDeleting())
{
return;
}
destination.ReplicateDeletion(reference.Uuid());
}
public virtual IReplicationReference ReferenceNewObject(object obj, IReplicationReference
counterpartReference, IReplicationReference referencingObjCounterPartRef, string
fieldName)
{
IDrsUUID uuid = counterpartReference.Uuid();
if (uuid == null)
{
return null;
}
byte[] signature = uuid.GetSignaturePart();
long longPart = uuid.GetLongPart();
long version = counterpartReference.Version();
Db4oDatabase db = _signatureMap.Produce(signature, 0);
Db4oReplicationReferenceImpl @ref = new Db4oReplicationReferenceImpl(obj, db, longPart
, version);
AddReference(@ref);
return @ref;
}
private bool HandleNewObject(object obj, IReplicationReference ownerRef, IReplicationProviderInside
owner, IReplicationProviderInside other, object referencingObject, string fieldName
, bool needsToBeActivated, bool listenerAlreadyNotified)
{
if (_directionTo == owner)
{
return false;
}
if (needsToBeActivated)
{
owner.Activate(obj);
}
if (!listenerAlreadyNotified)
{
_event.ResetAction();
_event._isConflict = false;
_event._creationDate = TimeStampIdGenerator.IdToMilliseconds(ownerRef.Uuid().GetLongPart
());
if (owner == _providerA)
{
_stateInA.SetAll(obj, true, false, -1);
_stateInB.SetAll(null, false, false, -1);
}
else
{
_stateInA.SetAll(null, false, false, -1);
_stateInB.SetAll(obj, true, false, -1);
}
if (_listener != null)
{
_listener.OnReplicate(_event);
if (_event._actionWasChosen)
{
if (_event._actionChosenState == null)
{
return false;
}
if (_event._actionChosenState.GetObject() != obj)
{
return false;
}
}
}
}
object counterpart = EmptyClone(owner, obj);
ownerRef.SetCounterpart(counterpart);
ownerRef.MarkForReplicating(true);
IReplicationReference otherRef = other.ReferenceNewObject(counterpart, ownerRef,
GetCounterpartRef(referencingObject), fieldName);
otherRef.SetCounterpart(obj);
PutCounterpartRef(obj, otherRef);
if (_event._actionShouldStopTraversal)
{
return false;
}
return true;
}
private bool HandleMissingObjectInOther(object obj, IReplicationReference ownerRef
, IReplicationProviderInside owner, IReplicationProviderInside other, object referencingObject
, string fieldName)
{
bool isConflict = false;
bool wasModified = owner.WasModifiedSinceLastReplication(ownerRef);
if (wasModified)
{
isConflict = true;
}
if (_directionTo == other)
{
isConflict = true;
}
object prevailing = null;
//by default, deletion prevails
if (isConflict)
{
owner.Activate(obj);
}
_event.ResetAction();
_event._isConflict = isConflict;
_event._creationDate = TimeStampIdGenerator.IdToMilliseconds(ownerRef.Uuid().GetLongPart
());
long modificationDate = TimeStampIdGenerator.IdToMilliseconds(ownerRef.Version());
if (owner == _providerA)
{
_stateInA.SetAll(obj, false, wasModified, modificationDate);
_stateInB.SetAll(null, false, false, -1);
}
else
{
//owner == _providerB
_stateInA.SetAll(null, false, false, -1);
_stateInB.SetAll(obj, false, wasModified, modificationDate);
}
_listener.OnReplicate(_event);
if (isConflict && !_event._actionWasChosen)
{
ThrowReplicationConflictException();
}
if (_event._actionWasChosen)
{
if (_event._actionChosenState == null)
{
return false;
}
if (_event._actionChosenState == _stateInA)
{
prevailing = _stateInA.GetObject();
}
if (_event._actionChosenState == _stateInB)
{
prevailing = _stateInB.GetObject();
}
}
if (prevailing == null)
{
//Deletion has prevailed.
if (_directionTo == other)
{
return false;
}
ownerRef.MarkForDeleting();
return !_event._actionShouldStopTraversal;
}
bool needsToBeActivated = !isConflict;
//Already activated if there was a conflict.
return HandleNewObject(obj, ownerRef, owner, other, referencingObject, fieldName,
needsToBeActivated, true);
}
public virtual IReplicationReference ReferenceNewObject(object obj, IReplicationReference
counterpartReference, IReplicationReference unused, string unused2)
{
//System.out.println("referenceNewObject: " + obj + " UUID: " + counterpartReference.uuid());
IDrsUUID uuid = counterpartReference.Uuid();
long version = counterpartReference.Version();
if (GetObject(uuid) != null)
{
throw new Exception("Object exists already.");
}
IReplicationReference result = CreateReferenceFor(obj);
Store(obj, uuid, version);
return result;
}