private async Task LoadOperationItem(MobileServiceTableOperation operation, OperationBatch batch)
{
// only read the item from store if it is not in the operation already
if (operation.Item == null)
{
await TryStoreOperation(async() =>
{
operation.Item = await this.Store.LookupAsync(operation.TableName, operation.ItemId) as JObject;
}, batch, "Failed to read the item from local store.");
// Add sync error if item is not found.
if (operation.Item == null)
{
// Create an item with only id to be able handle error properly.
var item = new JObject(new JProperty(MobileServiceSystemColumns.Id, operation.ItemId));
var syncError = new MobileServiceTableOperationError(operation.Id,
operation.Version,
operation.Kind,
null,
operation.TableName,
item, null, null)
{
TableKind = this.tableKind,
Context = this.context
};
await batch.AddSyncErrorAsync(syncError);
}
}
}
private async Task<bool> ExecuteOperationAsync(MobileServiceTableOperation operation, OperationBatch batch)
{
if (operation.IsCancelled || this.CancellationToken.IsCancellationRequested)
{
return false;
}
operation.Table = await this.context.GetTable(operation.TableName, this.client);
await this.LoadOperationItem(operation, batch);
if (this.CancellationToken.IsCancellationRequested)
{
return false;
}
await TryUpdateOperationState(operation, MobileServiceTableOperationState.Attempted, batch);
// strip out system properties before executing the operation
operation.Item = MobileServiceSyncTable.RemoveSystemPropertiesKeepVersion(operation.Item);
JObject result = null;
Exception error = null;
try
{
result = await batch.SyncHandler.ExecuteTableOperationAsync(operation);
}
catch (Exception ex)
{
error = ex;
}
if (error != null)
{
await TryUpdateOperationState(operation, MobileServiceTableOperationState.Failed, batch);
if (TryAbortBatch(batch, error))
{
// there is no error to save in sync error and no result to capture
// this operation will be executed again next time the push happens
return false;
}
}
// save the result if ExecuteTableOperation did not throw
if (error == null && result.IsValidItem() && operation.CanWriteResultToStore)
{
await TryStoreOperation(() => this.Store.UpsertAsync(operation.TableName, result, fromServer: true), batch, "Failed to update the item in the local store.");
}
else if (error != null)
{
HttpStatusCode? statusCode = null;
string rawResult = null;
var iox = error as MobileServiceInvalidOperationException;
if (iox != null && iox.Response != null)
{
statusCode = iox.Response.StatusCode;
Tuple<string, JToken> content = await MobileServiceTable.ParseContent(iox.Response, this.client.SerializerSettings);
rawResult = content.Item1;
result = content.Item2.ValidItemOrNull();
}
var syncError = new MobileServiceTableOperationError(operation.Id,
operation.Version,
operation.Kind,
statusCode,
operation.TableName,
operation.Item,
rawResult,
result)
{
TableKind = this.tableKind,
Context = this.context
};
await batch.AddSyncErrorAsync(syncError);
}
bool success = error == null;
return success;
}
private async Task <bool> ExecuteOperationAsync(MobileServiceTableOperation operation, OperationBatch batch)
{
if (operation.IsCancelled || this.CancellationToken.IsCancellationRequested)
{
return(false);
}
operation.Table = await this.context.GetTable(operation.TableName, this.client);
await this.LoadOperationItem(operation, batch);
if (this.CancellationToken.IsCancellationRequested)
{
return(false);
}
await TryUpdateOperationState(operation, MobileServiceTableOperationState.Attempted, batch);
// strip out system properties before executing the operation
operation.Item = MobileServiceSyncTable.RemoveSystemPropertiesKeepVersion(operation.Item);
JObject result = null;
Exception error = null;
try
{
result = await batch.SyncHandler.ExecuteTableOperationAsync(operation);
}
catch (Exception ex)
{
error = ex;
}
if (error != null)
{
await TryUpdateOperationState(operation, MobileServiceTableOperationState.Failed, batch);
if (TryAbortBatch(batch, error))
{
// there is no error to save in sync error and no result to capture
// this operation will be executed again next time the push happens
return(false);
}
}
// save the result if ExecuteTableOperation did not throw
if (error == null && result.IsValidItem() && operation.CanWriteResultToStore)
{
await TryStoreOperation(() => this.Store.UpsertAsync(operation.TableName, result, fromServer: true), batch, "Failed to update the item in the local store.");
}
else if (error != null)
{
HttpStatusCode?statusCode = null;
string rawResult = null;
var iox = error as MobileServiceInvalidOperationException;
if (iox != null && iox.Response != null)
{
statusCode = iox.Response.StatusCode;
Tuple <string, JToken> content = await MobileServiceTable.ParseContent(iox.Response, this.client.SerializerSettings);
rawResult = content.Item1;
result = content.Item2.ValidItemOrNull();
}
var syncError = new MobileServiceTableOperationError(operation.Id,
operation.Version,
operation.Kind,
statusCode,
operation.TableName,
operation.Item,
rawResult,
result)
{
TableKind = this.tableKind,
Context = this.context
};
await batch.AddSyncErrorAsync(syncError);
}
bool success = error == null;
return(success);
}