/// <summary>
/// A method that is called when push operation has completed.
/// </summary>
/// <param name="result">Result.</param>
public virtual Task OnPushCompleteAsync (MobileServicePushCompletionResult result)
{
// We get here after we recevice the reply from Azure - in here it is too late to handle the conflicts!
// In theory, we should never see any error here if we handle them in ExecuteTableOperationAsync().
Debug.WriteLine ("Push complete result:" + result.Status);
Debug.WriteLine ("Push complete errors:" + result.Errors);
return Task.FromResult (0);
}
public override Task OnPushCompleteAsync(MobileServicePushCompletionResult result)
{
this.PushCompletionResult = result;
if (this.PushCompleteAction != null)
{
return PushCompleteAction(result);
}
else
{
return base.OnPushCompleteAsync(result);
}
}
public override async Task OnPushCompleteAsync(MobileServicePushCompletionResult result)
{
foreach (var error in result.Errors)
{
if (error.Status == HttpStatusCode.Conflict)
{
await error.CancelAndUpdateItemAsync(error.Result);
error.Handled = true;
}
}
await base.OnPushCompleteAsync(result);
}
public Task OnPushCompleteAsync(MobileServicePushCompletionResult result)
{
Debug.WriteLine("Push result: {0}", result.Status);
foreach (var error in result.Errors)
{
Debug.WriteLine(" Push error: {0}", error.Status);
if (error.Status == HttpStatusCode.Conflict)
{
// Simplistic conflict handling - server wins
error.Handled = true;
error.CancelAndUpdateItemAsync(error.Item);
}
}
return Task.FromResult(0);
}
private async Task FinalizePush(OperationBatch batch, MobileServicePushStatus batchStatus, IEnumerable <MobileServiceTableOperationError> syncErrors)
{
var result = new MobileServicePushCompletionResult(syncErrors, batchStatus);
try
{
await batch.SyncHandler.OnPushCompleteAsync(result);
// now that we've successfully given the errors to user, we can delete them from store
await batch.DeleteErrorsAsync();
}
catch (Exception ex)
{
batch.OtherErrors.Add(ex);
}
if (batchStatus != MobileServicePushStatus.Complete || batch.HasErrors(syncErrors))
{
List <MobileServiceTableOperationError> unhandledSyncErrors = syncErrors.Where(e => !e.Handled).ToList();
Exception inner;
if (batch.OtherErrors.Count == 1)
{
inner = batch.OtherErrors[0];
}
else
{
inner = batch.OtherErrors.Any() ? new AggregateException(batch.OtherErrors) : null;
}
// create a new result with only unhandled errors
result = new MobileServicePushCompletionResult(unhandledSyncErrors, batchStatus);
this.TaskSource.TrySetException(new MobileServicePushFailedException(result, inner));
}
else
{
this.TaskSource.SetResult(0);
}
}
public virtual Task OnPushCompleteAsync(MobileServicePushCompletionResult result)
{
return Task.FromResult(0);
}
private async Task FinalizePush(OperationBatch batch, MobileServicePushStatus batchStatus, IEnumerable<MobileServiceTableOperationError> syncErrors)
{
var result = new MobileServicePushCompletionResult(syncErrors, batchStatus);
try
{
await batch.SyncHandler.OnPushCompleteAsync(result);
// now that we've successfully given the errors to user, we can delete them from store
await batch.DeleteErrorsAsync();
}
catch (Exception ex)
{
batch.OtherErrors.Add(ex);
}
if (batchStatus != MobileServicePushStatus.Complete || batch.HasErrors(syncErrors))
{
List<MobileServiceTableOperationError> unhandledSyncErrors = syncErrors.Where(e => !e.Handled).ToList();
Exception inner;
if (batch.OtherErrors.Count == 1)
{
inner = batch.OtherErrors[0];
}
else
{
inner = batch.OtherErrors.Any() ? new AggregateException(batch.OtherErrors) : null;
}
// create a new result with only unhandled errors
result = new MobileServicePushCompletionResult(unhandledSyncErrors, batchStatus);
this.TaskSource.TrySetException(new MobileServicePushFailedException(result, inner));
}
else
{
this.TaskSource.SetResult(0);
}
}
public override async Task OnPushCompleteAsync(MobileServicePushCompletionResult result)
{
foreach (MobileServiceTableOperationError error in result.Errors)
{
#region Server wins
#if Server
#region insert
// 403
// Client 1 soft deleted or client 2 network failure // Client 2 inserts
// resolution Update the local item with server value
if (error.OperationKind == MobileServiceTableOperationKind.Insert && error.Status == HttpStatusCode.Conflict)
{
// If same preserve server changes
// if different preserver client changes
// cannot compare no server item get server item in a seperate call
TodoItem clientItem = error.Item.ToObject<TodoItem>();
var todoTab = App.MobileService.GetTable<TodoItem>();
//TodoItem serverItem;
var serverValue = await todoTab.LookupAsync(clientItem.Id);
// failed network call so remove update client with server version
if (clientItem.Text == serverValue.Text)
{
await error.CancelAndUpdateItemAsync(error.Result);
}
// Id collision
else
{
clientItem.Id = null;
await todoTable.InsertAsync(clientItem);
await error.CancelAndDiscardItemAsync();
}
}
#endregion
#region update
// 412
// Client 1 updates // Client 2 tries to update outdated item
// resolution Update the local item with server value
if (error.OperationKind == MobileServiceTableOperationKind.Update && error.Status == HttpStatusCode.PreconditionFailed)
{
await error.CancelAndUpdateItemAsync(error.Result);
}
//404
// Client 1 deletes // Client 2 tries to update deleted item
// Remove the item from local store
if (error.OperationKind == MobileServiceTableOperationKind.Update && error.Status == HttpStatusCode.NotFound)
{
await error.CancelAndDiscardItemAsync();
}
#endregion
#region delete
//412
// Client 1 updates // Client 2 tries to deletes item
// Resolution cancel the delete and update the local store with server value
if (error.OperationKind == MobileServiceTableOperationKind.Delete && error.Status == HttpStatusCode.PreconditionFailed)
{
await error.CancelAndUpdateItemAsync(error.Result);
}
#endregion
#endif
#endregion
#region ClientWins
#if Client
TodoItem clientItem = error.Item.ToObject<TodoItem>();
await error.CancelAndDiscardItemAsync();
#region insert
// 403
// Client 1 soft deleted or client 2 network failure // Client 2 inserts
// resolution Update the local item with server value
if (error.OperationKind == MobileServiceTableOperationKind.Insert && error.Status == HttpStatusCode.Conflict)
{
var todoTab = App.MobileService.GetTable<TodoItem>();
//TodoItem serverItem;
var serverValue = await todoTab.LookupAsync(clientItem.Id);
// failed network call so remove update client with server version
if (clientItem.Text == serverValue.Text)
{
await error.CancelAndUpdateItemAsync(error.Result);
}
// Id collision
else
{
clientItem.Id = null;
await todoTable.InsertAsync(clientItem);
await error.CancelAndDiscardItemAsync();
}
}
#endregion
#region update
// 412
// Client 1 updates // Client 2 tries to update outdated item
// resolution Update the server item
if (error.OperationKind == MobileServiceTableOperationKind.Update && error.Status == HttpStatusCode.PreconditionFailed)
{
error.Item[MobileServiceSystemColumns.Version] = error.Result[MobileServiceSystemColumns.Version];
await todoTable.UpdateAsync(clientItem);
}
//404
// Client 1 deletes // Client 2 tries to update deleted item
// insert the item to the server with a different id or undelete the item if soft delete is enabled
if (error.OperationKind == MobileServiceTableOperationKind.Update && error.Status == HttpStatusCode.NotFound)
{
// if soft delete enabled the call undelete and then update
await todoTable.InsertAsync(clientItem);
}
#endregion
#region delete
//412
// Client 1 updates // Client 2 tries to deletes item
// Resolution cancel the delete and update the local store with server value
if (error.OperationKind == MobileServiceTableOperationKind.Delete && error.Status == HttpStatusCode.PreconditionFailed)
{
error.Item[MobileServiceSystemColumns.Version] = error.Result[MobileServiceSystemColumns.Version];
await todoTable.DeleteAsync(clientItem);
}
#endregion
#endif
#endregion
}
}
/// <summary>
/// A method that is called when push operation has completed.
/// </summary>
/// <param name="result">An instance of <see cref="MobileServicePushCompletionResult"/></param>
/// <returns>Task that completes when result has been handled.</returns>
public virtual Task OnPushCompleteAsync(MobileServicePushCompletionResult result)
{
return(Task.FromResult(0));
}
/// <summary>
/// Initializes a new instance of <see cref="MobileServicePushFailedException"/>
/// </summary>
/// <param name="pushResult">Result of push operation.</param>
/// <param name="innerException">Inner exception that caused the push to fail.</param>
public MobileServicePushFailedException(MobileServicePushCompletionResult pushResult, Exception innerException)
: base("Push operation has failed. See the PushResult for details.", innerException)
{
this.PushResult = pushResult;
}
/// <summary>
/// Initializes a new instance of <see cref="MobileServicePushFailedException"/>
/// </summary>
/// <param name="pushResult">Result of push operation.</param>
/// <param name="innerException">Inner exception that caused the push to fail.</param>
public MobileServicePushFailedException(MobileServicePushCompletionResult pushResult, Exception innerException)
: base("Push operation has failed. See the PushResult for details.", innerException)
{
this.PushResult = pushResult;
}
/// <summary>
/// Initializes a new instance of <see cref="MobileServicePushFailedException"/>
/// </summary>
/// <param name="pushResult">Result of push operation.</param>
/// <param name="innerException">Inner exception that caused the push to fail.</param>
public MobileServicePushFailedException(MobileServicePushCompletionResult pushResult, Exception innerException)
: base(Resources.Push_Failure, innerException)
{
this.PushResult = pushResult;
}