private static void UpdateItems(IDbConnection connection, ISyncableStore store)
{
// loop through types and apply updates or inserts
foreach (var itemType in store.GetItemTypes())
{
System.Diagnostics.Debug.WriteLine("Updating itemType = " + itemType);
IDbCommand getUpdatedItemsCommand = connection.CreateCommand();
getUpdatedItemsCommand.CommandText =
String.Format(
"SELECT SyncStatus, GlobalCreatedReplica, CreatedTickCount, GlobalModifiedReplica, ModifiedTickCount, ItemData FROM SyncItems WHERE SyncStatus IN ({0},{1}) AND ItemType=@ItemType",
(int)SyncStatus.Insert, (int)SyncStatus.Update);
getUpdatedItemsCommand.AddParameter("@ItemType", itemType);
using (var reader = getUpdatedItemsCommand.ExecuteReader())
{
while (reader != null && reader.Read())
{
var createdReplicaInfo = SessionDbHelper.ReplicaInfoFromDataReader(reader, "Created");
var modifiedReplicaInfo = SessionDbHelper.ReplicaInfoFromDataReader(reader, "Modified");
var itemData = JObject.Parse((string)reader["ItemData"]);
var itemInfo = new SyncableItemInfo
{
ItemType = itemType,
Created = createdReplicaInfo,
Modified = modifiedReplicaInfo,
Deleted = false
};
UpdateItem(connection, store, itemInfo, itemData);
}
}
}
}
private static void DeleteItems(IDbConnection connection, ISyncableStore store)
{
// loop backwards through types and apply deletions
foreach (var itemType in store.GetItemTypes().Reverse())
{
IDbCommand getDeletedItemsCommand = connection.CreateCommand();
getDeletedItemsCommand.CommandText =
String.Format("SELECT * FROM SyncItems WHERE SyncStatus IN ({0},{1}) AND ItemType=@ItemType",
(int)SyncStatus.Delete, (int)SyncStatus.DeleteNonExisting);
getDeletedItemsCommand.AddParameter("@ItemType", itemType);
using (var reader = getDeletedItemsCommand.ExecuteReader())
{
while (reader != null && reader.Read())
{
var createdReplicaInfo = SessionDbHelper.ReplicaInfoFromDataReader(reader, "Created");
var modifiedReplicaInfo = SessionDbHelper.ReplicaInfoFromDataReader(reader, "Modified");
var itemInfo = new SyncableItemInfo
{
ItemType = itemType,
Created = createdReplicaInfo,
Modified = modifiedReplicaInfo,
Deleted = true
};
store.DeleteItem(itemInfo);
}
}
}
}
public JObject PutChanges(JObject request)
{
SessionDbHelper.ClearSyncItems(_connection);
var remoteKnowledge = SyncUtil.KnowledgeFromJson(request["knowledge"]);
SessionDbHelper.SaveRemoteKnowledge(_connection, remoteKnowledge);
var json = new JObject();
return(json);
}
public JObject GetChanges(JObject request)
{
var remoteKnowledge = SyncUtil.KnowledgeFromJson(request["knowledge"]);
var changedItems = _store.LocateChangedItems(remoteKnowledge).ToList();
SessionDbHelper.SaveChangedItems(_connection, changedItems);
var json = new JObject
{
{ "knowledge", SyncUtil.KnowledgeToJson(_store.GenerateLocalKnowledge()) },
{ "totalChanges", changedItems.Count() }
};
return(json);
}
public JObject BeginSession(JObject request)
{
var remoteItemTypes = request["itemTypes"].Select(itemType => (string)itemType).ToList();
if (!remoteItemTypes.SequenceEqual(_store.GetItemTypes()))
{
throw new Exception("Mismatched item types");
}
SessionDbHelper.CreateSessionDbTables(_connection);
var json = new JObject {
{ "maxBatchCount", 50 }, { "maxBatchSize", 1024 * 1024 }, { "useGzip", true }
};
return(json);
}
public JObject GetItemDataBatch(JObject request)
{
var startItem = (int)request["startItem"];
var maxBatchCount = (int)request["maxBatchCount"];
var maxBatchSize = (int)request["maxBatchSize"];
var batchArray = new JArray();
var getChangedItemsCommand = _connection.CreateCommand();
getChangedItemsCommand.CommandText = String.Format("SELECT ItemID, SyncStatus, ItemType, GlobalCreatedReplica, CreatedTickCount, GlobalModifiedReplica, ModifiedTickCount FROM SyncItems WHERE ItemID >= {0} ORDER BY ItemID", startItem);
using (var reader = getChangedItemsCommand.ExecuteReader())
{
var batchSize = 0;
while (reader != null && reader.Read())
{
ISyncableItemInfo requestedItemInfo = SessionDbHelper.SyncableItemInfoFromDataReader(reader);
var singleItem = new JObject();
JObject builder = SyncUtil.JsonItemFromSyncableItemInfo(requestedItemInfo);
if (!requestedItemInfo.Deleted)
{
_store.BuildItemData(requestedItemInfo, builder);
}
singleItem.Add(new JProperty("item", builder));
batchSize += singleItem.ToString().Length;
batchArray.Add(singleItem);
if (batchArray.Count >= maxBatchCount || batchSize >= maxBatchSize)
{
break;
}
}
}
var json = new JObject {
{ "batch", batchArray }
};
return(json);
}
private static void UpdateItem(IDbConnection connection, ISyncableStore store, ISyncableItemInfo itemInfo,
JObject itemData)
{
// Make sure all the item refs for this item have already been handled
foreach (var itemRefJson in itemData["item"]["itemRefs"])
{
var referencedItemInfo = SyncableItemInfoFromJson(itemRefJson);
var localReferencedItemInfo = store.LocateCurrentItemInfo(referencedItemInfo);
if (localReferencedItemInfo == null || localReferencedItemInfo.Deleted)
{
var getReferencedItemCommand = connection.CreateCommand();
getReferencedItemCommand.CommandText =
String.Format(
"SELECT SyncStatus, GlobalCreatedReplica, CreatedTickCount, GlobalModifiedReplica, ModifiedTickCount, ItemData FROM SyncItems WHERE GlobalCreatedReplica=@GlobalCreatedReplica AND CreatedTickCount=@CreatedTickCount AND ItemType=@ItemType");
getReferencedItemCommand.AddParameter("@GlobalCreatedReplica", referencedItemInfo.Created.ReplicaId);
getReferencedItemCommand.AddParameter("@CreatedTickCount",
referencedItemInfo.Created.ReplicaTickCount);
getReferencedItemCommand.AddParameter("@ItemType", referencedItemInfo.ItemType);
using (var reader = getReferencedItemCommand.ExecuteReader())
{
while (reader != null && reader.Read())
{
var createdReplicaInfo = SessionDbHelper.ReplicaInfoFromDataReader(reader, "Created");
var modifiedReplicaInfo = SessionDbHelper.ReplicaInfoFromDataReader(reader, "Modified");
var refItemData = JObject.Parse((string)reader["ItemData"]);
var possiblyUpdatedRefItemInfo = new SyncableItemInfo
{
ItemType = referencedItemInfo.ItemType,
Created = createdReplicaInfo,
Modified = modifiedReplicaInfo,
Deleted = false
};
UpdateItem(connection, store, possiblyUpdatedRefItemInfo, refItemData);
}
}
}
}
store.SaveItemData(itemInfo, itemData);
}
public JObject PutItemDataBatch(JObject request)
{
IDbCommand command = _connection.CreateCommand();
command.CommandText = "BEGIN";
command.ExecuteNonQuery();
try
{
var batch = (JArray)request["batch"];
foreach (JToken item in batch)
{
var remoteSyncableItemInfo = SyncUtil.SyncableItemInfoFromJson(item["item"]);
var itemData = new JObject {
{ "item", item["item"] }
};
var remoteKnowledge = SessionDbHelper.LoadRemoteKnowledge(_connection);
var localSyncableItemInfo = _store.LocateCurrentItemInfo(remoteSyncableItemInfo);
var status = SyncUtil.CalculateSyncStatus(remoteSyncableItemInfo, localSyncableItemInfo, remoteKnowledge);
SessionDbHelper.SaveItemData(_connection, remoteSyncableItemInfo, status, itemData);
}
command.CommandText = "COMMIT";
command.ExecuteNonQuery();
}
catch (Exception)
{
command.CommandText = "ROLLBACK";
command.ExecuteNonQuery();
throw;
}
var json = new JObject();
return(json);
}
public JObject ApplyChanges(JObject request)
{
SyncUtil.ApplyChangesAndUpdateKnowledge(_connection, _store, SessionDbHelper.LoadRemoteKnowledge(_connection));
return(new JObject());
}
