public override List <SyncOperation> GetSyncOperations(DBreeze.Transactions.Transaction tran, out bool repeatSync)
{
var syncList = new List <SyncOperation>();
_newLocalSyncTimeStamp = DateTime.UtcNow.Ticks; //This value will be applied if there is nothing to synchronize
repeatSync = false;
var changedEntities = new Dictionary <long, Tuple <long, bool> >(); //Key is entityId, Value is Synctimestamp
var entityType = typeof(T).FullName;
var lastLocalSyncTimeStamp = tran.Select <byte[], long>(_entitySync.entityTable, new byte[] { LocalSyncTS, 1 }).Value;
foreach (var row in
tran.SelectForwardFromTo <byte[], byte[]>(_entitySync.entityTable,
new byte[] { SyncLog }.ConcatMany((lastLocalSyncTimeStamp + 1).To_8_bytes_array_BigEndian(), long.MinValue.To_8_bytes_array_BigEndian()),
true, //true, but LastLocalSyncTimeStamp+1 is used
new byte[] { SyncLog }.ConcatMany(long.MaxValue.To_8_bytes_array_BigEndian(), long.MaxValue.To_8_bytes_array_BigEndian()),
true))
{
if (changedEntities.Count > _entitySync.LimitationOfEntitesPerRound)
{
repeatSync = true;
break;
}
//We will leave only last update of the particular entity
if (!changedEntities.TryGetValue(row.Key.Substring(9, 8).To_Int64_BigEndian(), out var tpl1))
{
changedEntities[row.Key.Substring(9, 8).To_Int64_BigEndian()] = new Tuple <long, bool>(row.Key.Substring(1, 8).To_Int64_BigEndian(),
(row.Value?.Length >= 1 && row.Value[0] == 1) ? true : false) //indicating that new entity was inserted
;
}
else
{
changedEntities[row.Key.Substring(9, 8).To_Int64_BigEndian()] = new Tuple <long, bool>(row.Key.Substring(1, 8).To_Int64_BigEndian(),
(tpl1.Item2 || (row.Value?.Length >= 1 && row.Value[0] == 1)) ? true : false) //indicating that new entity was inserted (from any of inserts that must be done for the id)
;
}
_newLocalSyncTimeStamp = row.Key.Substring(1, 8).To_Int64_BigEndian();
}
foreach (var ent in changedEntities.OrderBy(r => r.Key))
{
var rowEntity = tran.Select <byte[], byte[]>(_entitySync.entityTable, new byte[] { Entity }.Concat(ent.Key.To_8_bytes_array_BigEndian()));
var syncOperation = new SyncOperation()
{
ExternalId = ent.Value.Item2 ? 0 : ent.Key, //if entity new ExternalId will be 0 otherwise will equal to InternalId and higher than 0
InternalId = ent.Key,
Operation = rowEntity.Exists ? SyncOperation.eOperation.INSERT : SyncOperation.eOperation.REMOVE,
Type = entityType,
SyncTimestamp = ent.Value.Item1
};
if (rowEntity.Exists)
{
syncOperation.SerializedObject = rowEntity.GetDataBlockWithFixedAddress <byte[]>();
}
syncList.Add(syncOperation);
}
return(syncList);
}