public object LoadChangeData(LoadChangeContext loadChangeContext)
{
object retVal = null;
ItemMetadata item = _metaData.FindItemMetadataById(loadChangeContext.ItemChange.ItemId);
if (item != null)
{
//return a copy of the data.
retVal = ConvertToTransferData(GetDataItem(item));
}
return(retVal);
}
//Update the metadata store with changes that have occured on the data store since the last time it was updated.
public void UpdateMetadataStoreWithLocalChanges()
{
SyncVersion newVersion = new SyncVersion(0, _metadata.GetNextTickCount());
_metadata.DeleteDetector.MarkAllItemsUnreported();
foreach (Guid id in _store.Ids)
{
ItemData data = _store.Get(id);
ItemMetadata item = null;
//Look up an item's metadata by its ID...
item = _metadata.FindItemMetadataById(new SyncId(id));
if (null == item)
{
//New item, must have been created since that last time the metadata was updated.
//Create the item metadata required for sync (giving it a SyncID and a version, defined to be a DWORD and a ULONGLONG
//For creates, simply provide the relative replica ID (0) and the tick count for the provider (ever increasing)
item = _metadata.CreateItemMetadata(new SyncId(id), newVersion);
item.ChangeVersion = newVersion;
SaveItemMetadata(item, data.TimeStamp);
_syncItemCount++;
}
else
{
if (data.TimeStamp > item.GetUInt64Field(TIMESTAMP_COLUMNNAME)) // the item has changed since the last sync operation.
{
//Changed Item, this item has changed since the last time the metadata was updated.
//Assign a new version by simply stating "who" modified this item (0 = local/me) and "when" (tick count for the store)
item.ChangeVersion = newVersion;
SaveItemMetadata(item, data.TimeStamp);
_syncItemCount++;
}
else
{
//Unchanged item, nothing has changes so just mark it as live so that the metadata knows it has not been deleted.
_metadata.DeleteDetector.ReportLiveItemById(new SyncId(id));
}
}
}
//Now go back through the items that are no longer in the store and mark them as deleted in the metadata.
//This sets the item as a tombstone.
foreach (ItemMetadata item in _metadata.DeleteDetector.FindUnreportedItems())
{
item.MarkAsDeleted(newVersion);
SaveItemMetadata(item, 0); // set timestamp to 0 for tombstones
}
}
public SyncedNodeAttributes FindItemMetadataBySyncId(SyncId syncId)
{
var item = _metadata.FindItemMetadataById(syncId);
return(GetItemInfo(item));
}
//Update the metadata store with changes that have occured on the data store since the last time it was updated.
public void UpdateMetadataStoreWithLocalChanges()
{
SyncVersion newVersion = new SyncVersion(0, _metadata.GetNextTickCount());
_metadata.DeleteDetector.MarkAllItemsUnreported();
var entities = _syncContext.GetSyncObjects(CompanyId, StoreId);
foreach (ISyncDataObject entity in entities)
{
try
{
ISyncDataObject data = entity;
ItemMetadata item = null;
//Look up an item's metadata by its ID...
item = _metadata.FindItemMetadataById(new SyncId(entity.SyncItemId));
if (null == item)
{
//New item, must have been created since that last time the metadata was updated.
//Create the item metadata required for sync (giving it a SyncID and a version, defined to be a DWORD and a ULONGLONG
//For creates, simply provide the relative replica ID (0) and the tick count for the provider (ever increasing)
item = _metadata.CreateItemMetadata(new SyncId(entity.SyncItemId), newVersion);
item.ChangeVersion = newVersion;
SaveItemMetadata(item, BitConverter.ToUInt64(data.SyncItemVersion, 0));
//var package = data as SyncDataPackage;
//if (package != null)
//{
// item.SetCustomField(PACKAGECOUNT, (UInt32)package.Items.Count);
//}
}
else
{
//var package = data as SyncDataPackage;
//var packageCount = item.GetUInt32Field(PACKAGECOUNT);
if (BitConverter.ToUInt64(data.SyncItemVersion, 0) != item.GetUInt64Field(TIMESTAMP_COLUMNNAME)) // the item has changed since the last sync operation.
{
//Changed Item, this item has changed since the last time the metadata was updated.
//Assign a new version by simply stating "who" modified this item (0 = local/me) and "when" (tick count for the store)
item.ChangeVersion = newVersion;
SaveItemMetadata(item, BitConverter.ToUInt64(data.SyncItemVersion, 0));
}
else
{
//Unchanged item, nothing has changes so just mark it as live so that the metadata knows it has not been deleted.
_metadata.DeleteDetector.ReportLiveItemById(new SyncId(entity.SyncItemId));
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
//Now go back through the items that are no longer in the store and mark them as deleted in the metadata.
//This sets the item as a tombstone.
foreach (ItemMetadata item in _metadata.DeleteDetector.FindUnreportedItems())
{
item.MarkAsDeleted(newVersion);
SaveItemMetadata(item, 0); // set timestamp to null for tombstones
}
}