/// <summary>
/// Method that synchronize the Cache by uploading all modified changes and then downloading the
/// server changes.
/// </summary>
internal async Task <CacheRefreshStatistics> SynchronizeAsync(CancellationToken cancellationToken)
{
CacheRefreshStatistics statistics = new CacheRefreshStatistics();
try
{
// Check if cancellation has occured
if (cancellationToken.IsCancellationRequested)
{
cancellationToken.ThrowIfCancellationRequested();
}
// set start time
statistics.StartTime = DateTime.Now;
// First create the CacheRequestHandler
this.cacheRequestHandler = new HttpCacheRequestHandler(this.serviceUri, this.controllerBehavior);
// Then fire the BeginSession call on the local provider.
this.localProvider.BeginSession();
// Set the flag to indicate BeginSession was successful
this.beginSessionComplete = true;
// Do uploads first
statistics = await this.EnqueueUploadRequest(statistics, cancellationToken);
// Set end time
statistics.EndTime = DateTime.Now;
// Call EndSession only if BeginSession was successful.
if (this.beginSessionComplete)
{
this.localProvider.EndSession();
}
}
catch (OperationCanceledException ex)
{
statistics.EndTime = DateTime.Now;
statistics.Cancelled = true;
statistics.Error = ex;
this.localProvider.EndSession();
}
catch (Exception ex)
{
statistics.EndTime = DateTime.Now;
statistics.Error = ex;
this.localProvider.EndSession();
}
finally
{
// Reset the state
this.ResetAsyncWorkerManager();
}
return(statistics);
}
/// <summary>
/// Method that performs an upload. It gets the ChangeSet from the local provider and then creates an
/// CacheRequest object for that ChangeSet and then passed the processing asynchronously to the underlying
/// CacheRequestHandler.
/// </summary>
private async Task <CacheRefreshStatistics> EnqueueUploadRequest(CacheRefreshStatistics statistics, CancellationToken cancellationToken)
{
this.changeSetId = Guid.NewGuid();
try
{
// Check if cancellation has occured
if (cancellationToken.IsCancellationRequested)
{
cancellationToken.ThrowIfCancellationRequested();
}
ChangeSet changeSet = this.localProvider.GetChangeSet(this.changeSetId);
if (changeSet == null || changeSet.Data == null || changeSet.Data.Count == 0)
{
// No data to upload. Skip upload phase.
statistics = await this.EnqueueDownloadRequest(statistics, cancellationToken);
}
else
{
// Create a SyncRequest out of this.
CacheRequest request = new CacheRequest
{
RequestId = this.changeSetId,
Format = this.ControllerBehavior.SerializationFormat,
RequestType = CacheRequestType.UploadChanges,
Changes = changeSet.Data,
KnowledgeBlob = changeSet.ServerBlob,
IsLastBatch = changeSet.IsLastBatch
};
var args = await this.cacheRequestHandler.ProcessCacheRequestAsync(request, changeSet.IsLastBatch, cancellationToken);
statistics = await this.ProcessCacheRequestResults(statistics, args, cancellationToken);
}
}
catch (OperationCanceledException)
{
// Re throw the operation cancelled
throw;
}
catch (Exception e)
{
if (ExceptionUtility.IsFatal(e))
{
throw;
}
statistics.Error = e;
}
return(statistics);
}
/// <summary>
/// Method that performs a download. It gets the server blob anchor from the local provider and then creates an
/// CacheRequest object for that download request. It then passes the processing asynchronously to the underlying
/// CacheRequestHandler.
/// </summary>
private async Task<CacheRefreshStatistics> EnqueueDownloadRequest(CacheRefreshStatistics statistics,
CancellationToken cancellationToken,
IProgress<SyncProgressEvent> progress = null)
{
try
{
if (cancellationToken.IsCancellationRequested)
cancellationToken.ThrowIfCancellationRequested();
Boolean isLastBatch = false;
while (!isLastBatch)
{
if (cancellationToken.IsCancellationRequested)
cancellationToken.ThrowIfCancellationRequested();
// Create a SyncRequest for download.
CacheRequest request = new CacheRequest
{
Format = this.ControllerBehavior.SerializationFormat,
RequestType = CacheRequestType.DownloadChanges,
KnowledgeBlob = this.localProvider.GetServerBlob()
};
// Get Changes
DateTime durationStartDate = DateTime.Now;
var requestResult = await this.cacheRequestHandler.ProcessCacheRequestAsync(
request, null, cancellationToken);
statistics = await this.ProcessCacheRequestResults(statistics, requestResult, cancellationToken);
// Check if we are at the end
if (requestResult.ChangeSet == null || requestResult.ChangeSet.IsLastBatch)
isLastBatch = true;
// Reporting progress after get changes from local store
if (progress != null)
progress.Report(new SyncProgressEvent(SyncStage.DownloadingChanges, DateTime.Now.Subtract(durationStartDate), true, (requestResult.ChangeSet != null ? requestResult.ChangeSet.Data : null)));
}
}
catch (OperationCanceledException)
{
// Re throw the operation cancelled
throw;
}
catch (Exception e)
{
if (ExceptionUtility.IsFatal(e))
throw;
statistics.Error = e;
}
return statistics;
}
/// <summary>
/// Internal ctor to prevent public instantiation.
/// </summary>
/// <param name="stats">Statistics parameter</param>
/// <param name="error">Refresh exception.</param>
/// <param name="cancelled">Cancellation flag</param>
internal RefreshCompletedEventArgs(CacheRefreshStatistics stats, Exception error, bool cancelled)
{
if (stats == null)
{
throw new ArgumentNullException("stats");
}
this.Statistics = stats;
this.Error = error;
this.Cancelled = cancelled;
}
/// <summary>
/// Internal ctor to prevent public instantiation.
/// </summary>
/// <param name="stats">Statistics parameter</param>
/// <param name="error">Refresh exception.</param>
/// <param name="cancelled">Cancellation flag</param>
internal RefreshCompletedEventArgs(CacheRefreshStatistics stats, Exception error, bool cancelled)
{
if (stats == null)
{
throw new ArgumentNullException("stats");
}
this.Statistics = stats;
this.Error = error;
this.Cancelled = cancelled;
}
/// <summary>
/// Method that refreshes the Cache by uploading all modified changes and then downloading the
/// server changes.
/// </summary>
public void RefreshAsync()
{
if (this.IsBusy)
{
throw CacheControllerException.CreateCacheBusyException();
}
this.refreshStats = new CacheRefreshStatistics();
this.StartAsyncWorkerManager();
// Enqueue an async operation
this._asyncWorkManager.AddWorkRequest(new AsyncWorkRequest(RefreshWorker, RefreshWorkerCompleted, null));
}
/// <summary>
/// Method that performs a download. It gets the server blob anchor from the local provider and then creates an
/// CacheRequest object for that download request. It then passes the processing asynchronously to the underlying
/// CacheRequestHandler.
/// </summary>
private async Task <CacheRefreshStatistics> EnqueueDownloadRequest(CacheRefreshStatistics statistics, CancellationToken cancellationToken)
{
try
{
if (cancellationToken.IsCancellationRequested)
{
cancellationToken.ThrowIfCancellationRequested();
}
// Create a SyncRequest for download.
CacheRequest request = new CacheRequest
{
Format = this.ControllerBehavior.SerializationFormat,
RequestType = CacheRequestType.DownloadChanges,
KnowledgeBlob = this.localProvider.GetServerBlob()
};
var args = await this.cacheRequestHandler.ProcessCacheRequestAsync(request, null, cancellationToken);
statistics = await this.ProcessCacheRequestResults(statistics, args, cancellationToken);
}
catch (OperationCanceledException)
{
// Re throw the operation cancelled
throw;
}
catch (Exception e)
{
if (ExceptionUtility.IsFatal(e))
{
throw;
}
statistics.Error = e;
}
return(statistics);
}
/// <summary>
/// Method that performs an upload. It gets the ChangeSet from the local provider and then creates an
/// CacheRequest object for that ChangeSet and then passed the processing asynchronously to the underlying
/// CacheRequestHandler.
/// </summary>
private async Task <CacheRefreshStatistics> EnqueueUploadRequest(CacheRefreshStatistics statistics,
CancellationToken cancellationToken,
IProgress <SyncProgressEvent> progress = null)
{
this.changeSetId = Guid.NewGuid();
try
{
// Check if cancellation has occured
if (cancellationToken.IsCancellationRequested)
{
cancellationToken.ThrowIfCancellationRequested();
}
// Get Changes
DateTime durationStartDate = DateTime.Now;
ChangeSet changeSet = await this.localProvider.GetChangeSet(this.changeSetId);
// Reporting progress after get changes from local store
if (progress != null)
{
progress.Report(new SyncProgressEvent(SyncStage.GetChanges, DateTime.Now.Subtract(durationStartDate), true, (changeSet != null ? changeSet.Data : null)));
}
// No data to upload. Skip upload phase.
if (changeSet == null || changeSet.Data == null || changeSet.Data.Count == 0)
{
return(statistics);
}
// Create a SyncRequest out of this.
CacheRequest request = new CacheRequest
{
RequestId = this.changeSetId,
Format = this.ControllerBehavior.SerializationFormat,
RequestType = CacheRequestType.UploadChanges,
Changes = changeSet.Data,
KnowledgeBlob = changeSet.ServerBlob,
IsLastBatch = changeSet.IsLastBatch
};
// Upload changes to server
durationStartDate = DateTime.Now;
var requestResult = await this.cacheRequestHandler.ProcessCacheRequestAsync(
request, changeSet.IsLastBatch, cancellationToken);
// Get response from server if mb any conflicts or updated items
statistics = await this.ProcessCacheRequestResults(statistics, requestResult, cancellationToken);
// Reporting progress after uploading changes, and mb get back Conflicts and new Id from insterted items
if (progress != null)
{
progress.Report(new SyncProgressEvent(SyncStage.UploadingChanges, DateTime.Now.Subtract(durationStartDate), true,
changeSet.Data, requestResult.ChangeSetResponse.Conflicts, requestResult.ChangeSetResponse.UpdatedItems));
}
}
catch (OperationCanceledException)
{
// Re throw the operation cancelled
throw;
}
catch (Exception e)
{
if (ExceptionUtility.IsFatal(e))
{
throw;
}
statistics.Error = e;
}
return(statistics);
}
/// <summary>
/// Method that refreshes the Cache by uploading all modified changes and then downloading the
/// server changes.
/// </summary>
public void RefreshAsync()
{
if (this.IsBusy)
{
throw CacheControllerException.CreateCacheBusyException();
}
this.refreshStats = new CacheRefreshStatistics();
this.StartAsyncWorkerManager();
// Enqueue an async operation
this._asyncWorkManager.AddWorkRequest(new AsyncWorkRequest(RefreshWorker, RefreshWorkerCompleted, null));
}
/// <summary>
/// Method that refreshes the Cache by uploading all modified changes and then downloading the
/// server changes.
/// </summary>
/// <returns>A CacheRefreshStatistics object denoting the statistics from the Refresh call</returns>
public CacheRefreshStatistics Refresh()
{
this._controllerBehavior.Locked = true;
try
{
// First create the CacheRequestHandler
this._cacheRequestHandler = CacheRequestHandler.CreateRequestHandler(this._serviceUri, this._controllerBehavior);
CacheRefreshStatistics refreshStats = new CacheRefreshStatistics();
refreshStats.StartTime = DateTime.Now;
bool uploadComplete = false;
bool downloadComplete = false;
// Start sync by executin an Upload request
while (!uploadComplete || !downloadComplete)
{
if (!uploadComplete)
{
Guid changeSetId = Guid.NewGuid();
ChangeSet changeSet = this._localProvider.GetChangeSet(changeSetId);
if (changeSet.Data == null || changeSet.Data.Count == 0)
{
// No data to upload. Skip upload phase.
uploadComplete = true;
}
else
{
// Create a SyncRequest out of this.
CacheRequest request = new CacheRequest()
{
RequestId = changeSetId,
RequestType = CacheRequestType.UploadChanges,
Changes = changeSet.Data,
KnowledgeBlob = changeSet.ServerBlob,
IsLastBatch = changeSet.IsLastBatch
};
// Increment the stats
refreshStats.TotalChangeSetsUploaded++;
ChangeSetResponse response = (ChangeSetResponse)this._cacheRequestHandler.ProcessCacheRequest(request);
// Increment the stats
refreshStats.TotalUploads += (uint)request.Changes.Count;
response.ConflictsInternal.ForEach((e1) =>
{
if (e1 is SyncConflict)
{
refreshStats.TotalSyncConflicts++;
}
else
{
refreshStats.TotalSyncErrors++;
}
});
// Send the response to the local provider
this._localProvider.OnChangeSetUploaded(changeSetId, response);
uploadComplete = request.IsLastBatch;
}
}
else if (!downloadComplete)
{
// Create a SyncRequest for download.
CacheRequest request = new CacheRequest()
{
RequestType = CacheRequestType.DownloadChanges,
KnowledgeBlob = this.LocalProvider.GetServerBlob()
};
ChangeSet changeSet = (ChangeSet)this._cacheRequestHandler.ProcessCacheRequest(request);
// Increment the refresh stats
refreshStats.TotalChangeSetsDownloaded++;
refreshStats.TotalDownloads += (uint)changeSet.Data.Count;
// Call the SaveChangeSet method on local provider.
this.LocalProvider.SaveChangeSet(changeSet);
downloadComplete = changeSet.IsLastBatch;
}
}
refreshStats.EndTime = DateTime.Now;
// Finally return the statistics object
return(refreshStats);
}
finally
{
// Unlock the ControllerBehavior object
this._controllerBehavior.Locked = false;
}
}
/// <summary>
/// Method that synchronize the Cache by uploading all modified changes and then downloading the
/// server changes.
/// </summary>
internal async Task<CacheRefreshStatistics> SynchronizeAsync(CancellationToken cancellationToken,
IProgress<SyncProgressEvent> progress = null)
{
CacheRefreshStatistics statistics = new CacheRefreshStatistics();
// Check if cancellation has occured
if (cancellationToken.IsCancellationRequested)
cancellationToken.ThrowIfCancellationRequested();
// set start time
statistics.StartTime = DateTime.Now;
// Reporting progress
if (progress != null)
progress.Report(new SyncProgressEvent(SyncStage.StartingSync, TimeSpan.Zero));
try
{
// First create the CacheRequestHandler
this.cacheRequestHandler = new HttpCacheRequestHandler(this.serviceUri, this.controllerBehavior);
// Then fire the BeginSession call on the local provider.
await this.localProvider.BeginSession();
// Set the flag to indicate BeginSession was successful
this.beginSessionComplete = true;
// Check if cancellation has occured
if (cancellationToken.IsCancellationRequested)
cancellationToken.ThrowIfCancellationRequested();
// Do uploads first (no batch mode on Upload Request)
statistics = await this.EnqueueUploadRequest(statistics, cancellationToken, progress);
// Check if cancellation has occured
if (cancellationToken.IsCancellationRequested)
cancellationToken.ThrowIfCancellationRequested();
// then Download (be careful, could be in batch mode)
statistics = await this.EnqueueDownloadRequest(statistics, cancellationToken, progress);
// Set end time
statistics.EndTime = DateTime.Now;
// Call EndSession only if BeginSession was successful.
if (this.beginSessionComplete)
this.localProvider.EndSession();
}
catch (OperationCanceledException ex)
{
statistics.EndTime = DateTime.Now;
statistics.Cancelled = true;
statistics.Error = ex;
this.localProvider.EndSession();
}
catch (Exception ex)
{
statistics.EndTime = DateTime.Now;
statistics.Error = ex;
this.localProvider.EndSession();
}
finally
{
// Reset the state
this.ResetAsyncWorkerManager();
}
// Reporting progress
if (progress != null)
progress.Report(new SyncProgressEvent(SyncStage.EndingSync, statistics.EndTime.Subtract(statistics.StartTime)));
return statistics;
}
/// <summary>
/// Method that performs a download. It gets the server blob anchor from the local provider and then creates an
/// CacheRequest object for that download request. It then passes the processing asynchronously to the underlying
/// CacheRequestHandler.
/// </summary>
private async Task<CacheRefreshStatistics> EnqueueDownloadRequest(CacheRefreshStatistics statistics,
CancellationToken cancellationToken,
IProgress<SyncProgressEvent> progress = null)
{
try
{
if (cancellationToken.IsCancellationRequested)
cancellationToken.ThrowIfCancellationRequested();
Boolean isLastBatch = false;
while (!isLastBatch)
{
if (cancellationToken.IsCancellationRequested)
cancellationToken.ThrowIfCancellationRequested();
// Create a SyncRequest for download.
CacheRequest request = new CacheRequest
{
Format = this.ControllerBehavior.SerializationFormat,
RequestType = CacheRequestType.DownloadChanges,
KnowledgeBlob = this.localProvider.GetServerBlob()
};
// Get Changes
DateTime durationStartDate = DateTime.Now;
var args = await this.cacheRequestHandler.ProcessCacheRequestAsync(request, null, cancellationToken);
statistics = await this.ProcessCacheRequestResults(statistics, args, cancellationToken);
// Check if we are at the end
if (args.ChangeSet == null || args.ChangeSet.IsLastBatch)
isLastBatch = true;
// Reporting progress after get changes from local store
if (progress != null)
progress.Report(new SyncProgressEvent(SyncStage.DownloadingChanges, DateTime.Now.Subtract(durationStartDate), true, (args.ChangeSet != null ? args.ChangeSet.Data : null)));
}
}
catch (OperationCanceledException)
{
// Re throw the operation cancelled
throw;
}
catch (Exception e)
{
if (ExceptionUtility.IsFatal(e))
throw;
statistics.Error = e;
}
return statistics;
}
/// <summary>
/// Method that performs an upload. It gets the ChangeSet from the local provider and then creates an
/// CacheRequest object for that ChangeSet and then passed the processing asynchronously to the underlying
/// CacheRequestHandler.
/// </summary>
private async Task<CacheRefreshStatistics> EnqueueUploadRequest(CacheRefreshStatistics statistics,
CancellationToken cancellationToken,
IProgress<SyncProgressEvent> progress = null)
{
this.changeSetId = Guid.NewGuid();
try
{
// Check if cancellation has occured
if (cancellationToken.IsCancellationRequested)
cancellationToken.ThrowIfCancellationRequested();
// Get Changes
DateTime durationStartDate = DateTime.Now;
ChangeSet changeSet = await this.localProvider.GetChangeSet(this.changeSetId);
// Reporting progress after get changes from local store
if (progress != null)
progress.Report(new SyncProgressEvent(SyncStage.GetChanges, DateTime.Now.Subtract(durationStartDate), true, (changeSet != null ? changeSet.Data : null)));
// No data to upload. Skip upload phase.
if (changeSet == null || changeSet.Data == null || changeSet.Data.Count == 0)
return statistics;
// Create a SyncRequest out of this.
CacheRequest request = new CacheRequest
{
RequestId = this.changeSetId,
Format = this.ControllerBehavior.SerializationFormat,
RequestType = CacheRequestType.UploadChanges,
Changes = changeSet.Data,
KnowledgeBlob = changeSet.ServerBlob,
IsLastBatch = changeSet.IsLastBatch
};
// Upload changes to server
durationStartDate = DateTime.Now;
var args = await this.cacheRequestHandler.ProcessCacheRequestAsync(request, changeSet.IsLastBatch, cancellationToken);
// Get response from server if mb any conflicts or updated items
statistics = await this.ProcessCacheRequestResults(statistics, args, cancellationToken);
// Reporting progress after uploading changes, and mb get back Conflicts and new Id from insterted items
if (progress != null)
progress.Report(new SyncProgressEvent(SyncStage.UploadingChanges, DateTime.Now.Subtract(durationStartDate), true,
changeSet.Data, args.ChangeSetResponse.Conflicts, args.ChangeSetResponse.UpdatedItems));
}
catch (OperationCanceledException)
{
// Re throw the operation cancelled
throw;
}
catch (Exception e)
{
if (ExceptionUtility.IsFatal(e))
throw;
statistics.Error = e;
}
return statistics;
}
/// <summary>
/// Method that synchronize the Cache by uploading all modified changes and then downloading the
/// server changes.
/// </summary>
internal async Task<CacheRefreshStatistics> SynchronizeAsync(CancellationToken cancellationToken,
IProgress<SyncProgressEvent> progress = null)
{
CacheRefreshStatistics statistics = new CacheRefreshStatistics();
// Check if cancellation has occured
if (cancellationToken.IsCancellationRequested)
cancellationToken.ThrowIfCancellationRequested();
// set start time
statistics.StartTime = DateTime.Now;
// Reporting progress
if (progress != null)
progress.Report(new SyncProgressEvent(SyncStage.StartingSync, TimeSpan.Zero));
try
{
// First create the CacheRequestHandler
this.cacheRequestHandler = new HttpCacheRequestHandler(this.serviceUri, this.controllerBehavior);
// Then fire the BeginSession call on the local provider.
await this.localProvider.BeginSession();
// Set the flag to indicate BeginSession was successful
this.beginSessionComplete = true;
// Check if cancellation has occured
if (cancellationToken.IsCancellationRequested)
cancellationToken.ThrowIfCancellationRequested();
// Do uploads first (no batch mode on Upload Request)
statistics = await this.EnqueueUploadRequest(statistics, cancellationToken, progress);
// If there is an error during Upload request, dont want to donwload
if (statistics.Error != null)
throw new Exception("Error occured during Upload request.", statistics.Error);
// Check if cancellation has occured
if (cancellationToken.IsCancellationRequested)
cancellationToken.ThrowIfCancellationRequested();
// When there are records records that are not uploading successfully
// a successfull download 1-N records will cause anchor to be updated.
// if anchor is updated then the records on the device will not be attempted for upload again
// on subsequent syncs. therefore check for null Error
if (statistics.Error == null)
{
// then Download (be careful, could be in batch mode)
statistics = await this.EnqueueDownloadRequest(statistics, cancellationToken, progress);
}
// Set end time
statistics.EndTime = DateTime.Now;
// Call EndSession only if BeginSession was successful.
if (this.beginSessionComplete)
this.localProvider.EndSession();
}
catch (OperationCanceledException ex)
{
statistics.EndTime = DateTime.Now;
statistics.Cancelled = true;
statistics.Error = ex;
if (this.beginSessionComplete)
this.localProvider.EndSession();
}
catch (Exception ex)
{
statistics.EndTime = DateTime.Now;
statistics.Error = ex;
if (this.beginSessionComplete)
this.localProvider.EndSession();
}
finally
{
// Reset the state
this.ResetAsyncWorkerManager();
}
// Reporting progress
if (progress != null)
progress.Report(new SyncProgressEvent(SyncStage.EndingSync, statistics.EndTime.Subtract(statistics.StartTime)));
return statistics;
}
/// <summary>
/// Called whenever the CacheRequestHandler proceeses an upload/download request. It is also responsible for
/// issuing another request if it wasnt the last batch. In case of receiving an Upload response it calls the
/// underlying provider with the status of the upload. In case of Download it notifies the local provider of the
/// changes that it needs to save.
/// </summary>
private async Task <CacheRefreshStatistics> ProcessCacheRequestResults(CacheRefreshStatistics statistics, CacheRequestResult e, CancellationToken cancellationToken)
{
try
{
if (cancellationToken.IsCancellationRequested)
{
cancellationToken.ThrowIfCancellationRequested();
}
if (e.Error != null)
{
// Check to see if it was a UploadRequest in which case we will have to call OnChangeSetUploaded
// with error to reset the dirty bits.
if (e.ChangeSetResponse != null)
{
// its an response to a upload
this.localProvider.OnChangeSetUploaded(e.Id, e.ChangeSetResponse);
}
// Finally complete Refresh with error.
statistics.Error = e.Error;
}
else if (e.ChangeSetResponse != null)
{
// its an response to a upload
this.localProvider.OnChangeSetUploaded(e.Id, e.ChangeSetResponse);
if (e.ChangeSetResponse.Error != null)
{
statistics.Error = e.ChangeSetResponse.Error;
return(statistics);
}
// Increment the ChangeSets uploaded count
statistics.TotalChangeSetsUploaded++;
statistics.TotalUploads += e.BatchUploadCount;
// Update refresh stats
foreach (var e1 in e.ChangeSetResponse.ConflictsInternal)
{
if (e1 is SyncConflict)
{
statistics.TotalSyncConflicts++;
}
else
{
statistics.TotalSyncErrors++;
}
}
// Dont enqueue another request if its been cancelled
if (!cancellationToken.IsCancellationRequested)
{
if (!((bool)e.State))
{
// Check to see if this was the last batch or else enqueue another pending Upload request
statistics = await this.EnqueueUploadRequest(statistics, cancellationToken);
}
else
{
// That was the last batch. Issue an Download request
statistics = await this.EnqueueDownloadRequest(statistics, cancellationToken);
}
}
else
{
cancellationToken.ThrowIfCancellationRequested();
}
}
else // It means its an Download response
{
Debug.Assert(e.ChangeSet != null, "Completion is not for a download request.");
// Increment the refresh stats
if (e.ChangeSet != null)
{
statistics.TotalChangeSetsDownloaded++;
statistics.TotalDownloads += (uint)e.ChangeSet.Data.Count;
await this.localProvider.SaveChangeSet(e.ChangeSet);
// Dont enqueue another request if its been cancelled
if (!cancellationToken.IsCancellationRequested)
{
if (!e.ChangeSet.IsLastBatch)
{
// Enqueue the next download
statistics = await this.EnqueueDownloadRequest(statistics, cancellationToken);
}
}
else
{
cancellationToken.ThrowIfCancellationRequested();
}
}
}
}
catch (OperationCanceledException)
{
// Re throw the operation cancelled
throw;
}
catch (Exception exp)
{
if (ExceptionUtility.IsFatal(exp))
{
throw;
}
statistics.Error = exp;
}
return(statistics);
}
/// <summary>
/// Called whenever the CacheRequestHandler proceeses an upload/download request. It is also responsible for
/// issuing another request if it wasnt the last batch. In case of receiving an Upload response it calls the
/// underlying provider with the status of the upload. In case of Download it notifies the local provider of the
/// changes that it needs to save.
/// </summary>
private async Task <CacheRefreshStatistics> ProcessCacheRequestResults(
CacheRefreshStatistics statistics, CacheRequestResult cacheRequestResult, CancellationToken cancellationToken)
{
try
{
if (cancellationToken.IsCancellationRequested)
{
cancellationToken.ThrowIfCancellationRequested();
}
#region Error
if (cacheRequestResult.Error != null)
{
// We have an error but we have a ChangeSetResponse with reading the upload respose
// So we can serialize results and update dirty bits
if (cacheRequestResult.ChangeSetResponse != null &&
cacheRequestResult.HttpStep == HttpState.End)
{
await this.localProvider.OnChangeSetUploaded(cacheRequestResult.Id, cacheRequestResult.ChangeSetResponse);
}
// Finally complete Refresh with error.
statistics.Error = cacheRequestResult.Error;
return(statistics);
}
#endregion
#region Upload response
if (cacheRequestResult.ChangeSetResponse != null)
{
if (cacheRequestResult.ChangeSetResponse.Error == null &&
cacheRequestResult.HttpStep == HttpState.End)
{
await this.localProvider.OnChangeSetUploaded(cacheRequestResult.Id, cacheRequestResult.ChangeSetResponse);
}
if (cacheRequestResult.ChangeSetResponse.Error != null)
{
statistics.Error = cacheRequestResult.ChangeSetResponse.Error;
return(statistics);
}
// Increment the ChangeSets uploaded count
statistics.TotalChangeSetsUploaded++;
statistics.TotalUploads += cacheRequestResult.BatchUploadCount;
// Update refresh stats
foreach (var e1 in cacheRequestResult.ChangeSetResponse.ConflictsInternal)
{
if (e1 is SyncConflict)
{
statistics.TotalSyncConflicts++;
}
else
{
statistics.TotalSyncErrors++;
}
}
return(statistics);
}
#endregion
#region Download Response
// it's a response to download
Debug.Assert(cacheRequestResult.ChangeSet != null, "Completion is not for a download request.");
// Increment the refresh stats
if (cacheRequestResult.ChangeSet != null && cacheRequestResult.ChangeSet.Data != null && cacheRequestResult.ChangeSet.Data.Count > 0)
{
statistics.TotalChangeSetsDownloaded++;
statistics.TotalDownloads += (uint)cacheRequestResult.ChangeSet.Data.Count;
await this.localProvider.SaveChangeSet(cacheRequestResult.ChangeSet);
}
return(statistics);
#endregion
}
catch (OperationCanceledException)
{
// Re throw the operation cancelled
throw;
}
catch (Exception exp)
{
if (ExceptionUtility.IsFatal(exp))
{
throw;
}
statistics.Error = exp;
}
return(statistics);
}
/// <summary>
/// Method that synchronize the Cache by uploading all modified changes and then downloading the
/// server changes.
/// </summary>
internal async Task <CacheRefreshStatistics> SynchronizeAsync(CancellationToken cancellationToken,
IProgress <SyncProgressEvent> progress = null)
{
CacheRefreshStatistics statistics = new CacheRefreshStatistics();
// Check if cancellation has occured
if (cancellationToken.IsCancellationRequested)
{
cancellationToken.ThrowIfCancellationRequested();
}
// set start time
statistics.StartTime = DateTime.Now;
// Reporting progress
if (progress != null)
{
progress.Report(new SyncProgressEvent(SyncStage.StartingSync, TimeSpan.Zero));
}
try
{
// First create the CacheRequestHandler
this.cacheRequestHandler = new HttpCacheRequestHandler(this.serviceUri, this.controllerBehavior);
// Then fire the BeginSession call on the local provider.
await this.localProvider.BeginSession();
// Set the flag to indicate BeginSession was successful
this.beginSessionComplete = true;
// Check if cancellation has occured
if (cancellationToken.IsCancellationRequested)
{
cancellationToken.ThrowIfCancellationRequested();
}
// Do uploads first (no batch mode on Upload Request)
statistics = await this.EnqueueUploadRequest(statistics, cancellationToken, progress);
// If there is an error during Upload request, dont want to donwload
if (statistics.Error != null)
{
throw new Exception("Error occured during Upload request.", statistics.Error);
}
// Check if cancellation has occured
if (cancellationToken.IsCancellationRequested)
{
cancellationToken.ThrowIfCancellationRequested();
}
// When there are records records that are not uploading successfully
// a successfull download 1-N records will cause anchor to be updated.
// if anchor is updated then the records on the device will not be attempted for upload again
// on subsequent syncs. therefore check for null Error
if (statistics.Error == null)
{
// then Download (be careful, could be in batch mode)
statistics = await this.EnqueueDownloadRequest(statistics, cancellationToken, progress);
}
// Set end time
statistics.EndTime = DateTime.Now;
// Call EndSession only if BeginSession was successful.
if (this.beginSessionComplete)
{
this.localProvider.EndSession();
}
}
catch (OperationCanceledException ex)
{
statistics.EndTime = DateTime.Now;
statistics.Cancelled = true;
statistics.Error = ex;
if (this.beginSessionComplete)
{
this.localProvider.EndSession();
}
}
catch (Exception ex)
{
statistics.EndTime = DateTime.Now;
statistics.Error = ex;
if (this.beginSessionComplete)
{
this.localProvider.EndSession();
}
}
finally
{
// Reset the state
this.ResetAsyncWorkerManager();
}
// Reporting progress
if (progress != null)
{
progress.Report(new SyncProgressEvent(SyncStage.EndingSync, statistics.EndTime.Subtract(statistics.StartTime)));
}
return(statistics);
}
/// <summary>
/// Called whenever the CacheRequestHandler proceeses an upload/download request. It is also responsible for
/// issuing another request if it wasnt the last batch. In case of receiving an Upload response it calls the
/// underlying provider with the status of the upload. In case of Download it notifies the local provider of the
/// changes that it needs to save.
/// </summary>
private async Task<CacheRefreshStatistics> ProcessCacheRequestResults(CacheRefreshStatistics statistics, CacheRequestResult cacheRequestResult, CancellationToken cancellationToken)
{
try
{
if (cancellationToken.IsCancellationRequested)
cancellationToken.ThrowIfCancellationRequested();
#region Error
if (cacheRequestResult.Error != null)
{
// Check to see if it was a UploadRequest in which case we will have to call OnChangeSetUploaded
// with error to reset the dirty bits.
if (cacheRequestResult.ChangeSetResponse != null)
{
// its an response to a upload
await this.localProvider.OnChangeSetUploaded(cacheRequestResult.Id, cacheRequestResult.ChangeSetResponse);
}
// Finally complete Refresh with error.
statistics.Error = cacheRequestResult.Error;
return statistics;
}
#endregion
#region Upload response
if (cacheRequestResult.ChangeSetResponse != null)
{
// its an response to a upload
await this.localProvider.OnChangeSetUploaded(cacheRequestResult.Id, cacheRequestResult.ChangeSetResponse);
if (cacheRequestResult.ChangeSetResponse.Error != null)
{
statistics.Error = cacheRequestResult.ChangeSetResponse.Error;
return statistics;
}
// Increment the ChangeSets uploaded count
statistics.TotalChangeSetsUploaded++;
statistics.TotalUploads += cacheRequestResult.BatchUploadCount;
// Update refresh stats
foreach (var e1 in cacheRequestResult.ChangeSetResponse.ConflictsInternal)
{
if (e1 is SyncConflict)
{
statistics.TotalSyncConflicts++;
}
else
{
statistics.TotalSyncErrors++;
}
}
return statistics;
}
#endregion
#region Download Response
// it's a response to download
Debug.Assert(cacheRequestResult.ChangeSet != null, "Completion is not for a download request.");
// Increment the refresh stats
if (cacheRequestResult.ChangeSet != null && cacheRequestResult.ChangeSet.Data != null && cacheRequestResult.ChangeSet.Data.Count > 0)
{
statistics.TotalChangeSetsDownloaded++;
statistics.TotalDownloads += (uint)cacheRequestResult.ChangeSet.Data.Count;
await this.localProvider.SaveChangeSet(cacheRequestResult.ChangeSet);
}
return statistics;
#endregion
}
catch (OperationCanceledException)
{
// Re throw the operation cancelled
throw;
}
catch (Exception exp)
{
if (ExceptionUtility.IsFatal(exp))
throw;
statistics.Error = exp;
}
return statistics;
}
