public async Task <bool> QueueOperationAsync(IMobileServiceFileOperation operation)
{
bool operationEnqueued = false;
await processingSemaphore.WaitAsync();
try
{
var pendingItemOperation = await this.operationsQueue.GetOperationByFileIdAsync(operation.FileId);
if (pendingItemOperation != null)
{
pendingItemOperation.OnQueueingNewOperation(operation);
if (pendingItemOperation.State == FileOperationState.Cancelled)
{
await this.operationsQueue.RemoveAsync(pendingItemOperation.Id);
}
}
if (operation.State != FileOperationState.Cancelled)
{
await this.operationsQueue.EnqueueAsync(operation);
operationEnqueued = true;
}
}
finally
{
processingSemaphore.Release();
}
return(operationEnqueued);
}
public async Task PullFilesAsync(string tableName, string itemId)
{
IEnumerable <MobileServiceFile> files = await this.mobileServiceFilesClient.GetFilesAsync(tableName, itemId);
foreach (var file in files)
{
FileSynchronizationAction syncAction = FileSynchronizationAction.Update;
MobileServiceFileMetadata metadata = await this.metadataStore.GetFileMetadataAsync(file.Id);
if (metadata == null)
{
syncAction = FileSynchronizationAction.Create;
metadata = MobileServiceFileMetadata.FromFile(file);
metadata.ContentMD5 = null;
metadata.LastModified = null;
}
if (string.Compare(metadata.ContentMD5, file.ContentMD5, StringComparison.Ordinal) != 0 ||
(metadata.LastModified == null || metadata.LastModified.Value.ToUniversalTime() != file.LastModified.Value.ToUniversalTime()))
{
metadata.LastModified = file.LastModified;
metadata.ContentMD5 = file.ContentMD5;
await this.metadataStore.CreateOrUpdateAsync(metadata);
await this.syncHandler.ProcessFileSynchronizationAction(file, syncAction);
NotifyFileOperationCompletion(file, syncAction.ToFileOperationKind(), FileOperationSource.ServerPull);
}
}
var fileMetadata = await this.metadataStore.GetMetadataAsync(tableName, itemId);
var deletedItemsMetadata = fileMetadata.Where(m => !files.Any(f => string.Compare(f.Id, m.FileId) == 0));
foreach (var metadata in deletedItemsMetadata)
{
IMobileServiceFileOperation pendingOperation = await this.operationsQueue.GetOperationByFileIdAsync(metadata.FileId);
// TODO: Need to call into the sync handler for conflict resolution here...
if (pendingOperation == null || pendingOperation is DeleteMobileServiceFileOperation)
{
await metadataStore.DeleteAsync(metadata);
await this.syncHandler.ProcessFileSynchronizationAction(MobileServiceFile.FromMetadata(metadata), FileSynchronizationAction.Delete);
NotifyFileOperationCompletion(MobileServiceFile.FromMetadata(metadata), FileOperationKind.Delete, FileOperationSource.ServerPull);
}
}
}
public async Task EnqueueAsync(IMobileServiceFileOperation operation)
{
OperationsInfo operationsInfo = this.operationsInfo.Value;
var operationItem = new FileOperationItem
{
FileId = operation.FileId,
Id = operation.Id,
Kind = operation.Kind,
Sequence = Interlocked.Increment(ref operationsInfo.Sequence)
};
await this.store.UpsertAsync(FileOperationTableName, new[] { operationItem.ToJsonObject() }, ignoreMissingColumns : false);
Interlocked.Increment(ref operationsInfo.Count);
}
public async Task PushChangesAsync(CancellationToken cancellationToken)
{
await processingSemaphore.WaitAsync(cancellationToken);
try
{
while (this.operationsQueue.Count > 0)
{
IMobileServiceFileOperation operation = await operationsQueue.PeekAsync();
// This would also take the cancellation token
await operation.Execute(this.metadataStore, this);
await operationsQueue.RemoveAsync(operation.Id);
}
}
finally
{
processingSemaphore.Release();
}
}
public abstract void OnQueueingNewOperation(IMobileServiceFileOperation operation);
public async Task EnqueueAsync(IMobileServiceFileOperation operation)
{
OperationsInfo operationsInfo = this.operationsInfo.Value;
var operationItem = new FileOperationItem
{
FileId = operation.FileId,
Id = operation.Id,
Kind = operation.Kind,
Sequence = Interlocked.Increment(ref operationsInfo.Sequence)
};
await this.store.UpsertAsync(FileOperationTableName, new[] { operationItem.ToJsonObject() }, ignoreMissingColumns: false);
Interlocked.Increment(ref operationsInfo.Count);
}
public override void OnQueueingNewOperation(IMobileServiceFileOperation operation)
{
}
public abstract void OnQueueingNewOperation(IMobileServiceFileOperation operation);
public override void OnQueueingNewOperation(IMobileServiceFileOperation operation)
{
//
}
public async Task<bool> QueueOperationAsync(IMobileServiceFileOperation operation)
{
bool operationEnqueued = false;
await processingSemaphore.WaitAsync();
try
{
var pendingItemOperation = await this.operationsQueue.GetOperationByFileIdAsync(operation.FileId);
if (pendingItemOperation != null)
{
pendingItemOperation.OnQueueingNewOperation(operation);
if (pendingItemOperation.State == FileOperationState.Cancelled)
{
await this.operationsQueue.RemoveAsync(pendingItemOperation.Id);
}
}
if (operation.State != FileOperationState.Cancelled)
{
await this.operationsQueue.EnqueueAsync(operation);
operationEnqueued = true;
}
}
finally
{
processingSemaphore.Release();
}
return operationEnqueued;
}