/// <summary>
/// Unmarshaller the response from the service to the response class.
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public override AmazonWebServiceResponse Unmarshall(JsonUnmarshallerContext context)
{
ListUpdatesResponse response = new ListUpdatesResponse();
context.Read();
int targetDepth = context.CurrentDepth;
while (context.ReadAtDepth(targetDepth))
{
if (context.TestExpression("nextToken", targetDepth))
{
var unmarshaller = StringUnmarshaller.Instance;
response.NextToken = unmarshaller.Unmarshall(context);
continue;
}
if (context.TestExpression("updateIds", targetDepth))
{
var unmarshaller = new ListUnmarshaller <string, StringUnmarshaller>(StringUnmarshaller.Instance);
response.UpdateIds = unmarshaller.Unmarshall(context);
continue;
}
}
return(response);
}
private void PopulateListUpdates(string datasetName, long lastSyncCount, List <Record> records, string nextToken, AmazonCognitoCallback callback, object state)
{
{
ListRecordsRequest request = new ListRecordsRequest();
//appendUserAgent(request, userAgent);
request.IdentityPoolId = identityPoolId;
request.IdentityId = this.GetCurrentIdentityId();
request.DatasetName = datasetName;
request.LastSyncCount = lastSyncCount;
// mark it large enough to reduce # of requests
request.MaxResults = 1024;
request.NextToken = nextToken;
client.ListRecordsAsync(request, delegate(AmazonServiceResult result)
{
if (result.Exception != null)
{
AmazonMainThreadDispatcher.ExecCallback(callback,
new AmazonCognitoResult(null, HandleException(result.Exception, "Failed to list records in dataset: " + datasetName), state));
return;
}
ListRecordsResponse listRecordsResponse = result.Response as ListRecordsResponse;
foreach (Amazon.CognitoSync.Model.Record remoteRecord in listRecordsResponse.Records)
{
//builder.addRecord(modelToRecord(remoteRecord));
records.Add(this.ModelToRecord(remoteRecord));
}
if (listRecordsResponse.NextToken == null)
{
DatasetUpdatesImpl updates = new DatasetUpdatesImpl(
datasetName,
records,
listRecordsResponse.DatasetSyncCount,
listRecordsResponse.SyncSessionToken,
listRecordsResponse.DatasetExists,
listRecordsResponse.DatasetDeletedAfterRequestedSyncCount,
listRecordsResponse.MergedDatasetNames
);
ListUpdatesResponse listUpdatesResponse = new ListUpdatesResponse
{
DatasetUpdates = updates
};
AmazonMainThreadDispatcher.ExecCallback(callback,
new AmazonCognitoResult(listUpdatesResponse, null, state));
return;
}
// update last evaluated key
nextToken = listRecordsResponse.NextToken;
// emulating the while loop
PopulateListUpdates(datasetName, lastSyncCount, records, nextToken, callback, state);
}, state);
}
}
private void RunSyncOperationAsync(int retry, Action <RunSyncOperationResponse> callback)
{
if (retry < 0)
{
callback(new RunSyncOperationResponse(false, null));
return;
}
long lastSyncCount = _local.GetLastSyncCount(GetIdentityId(), _datasetName);
// if dataset is deleted locally, push it to remote
if (lastSyncCount == -1)
{
#if DELETE_METHOD_SUPPORT
_remote.DeleteDatasetAsync(_datasetName, delegate(AmazonCognitoResult result)
{
if (result.Exception != null)
{
var e = result.Exception as DataStorageException;
AmazonLogging.LogError(AmazonLogging.AmazonLoggingLevel.Errors, "CognitoSyncManager", "OnSyncFailure" + e.Message);
this.FireSyncFailureEvent(e);
callback(new RunSyncOperationResponse(false, null));
return;
}
_local.PurgeDataset(GetIdentityId(), _datasetName);
AmazonLogging.Log(AmazonLogging.AmazonLoggingLevel.Verbose, "CognitoSyncManager", "OnSyncSuccess: dataset delete is pushed to remote");
this.FireSyncSuccessEvent(new List <Record>());
callback(new RunSyncOperationResponse(true, null));
return;
}, null);
#endif
// invalid scenario
AmazonLogging.LogError(AmazonLogging.AmazonLoggingLevel.Critical, "CognitoSyncManager", "OnSyncFailure: DeleteDataset is an invalid operation");
FireSyncFailureEvent(new DataStorageException("DeleteDataset is an invalid operation"));
callback(new RunSyncOperationResponse(false, null));
return;
}
// get latest modified records from remote
AmazonLogging.Log(AmazonLogging.AmazonLoggingLevel.Verbose, "CognitoSyncManager", "get latest modified records since " + lastSyncCount);
_remote.ListUpdatesAsync(_datasetName, lastSyncCount, delegate(AmazonCognitoResult listUpdatesResult)
{
RemoteDataStorage.DatasetUpdates datasetUpdates = null;
if (listUpdatesResult == null || listUpdatesResult.Exception != null)
{
var e = listUpdatesResult.Exception as DataStorageException;
AmazonLogging.LogException(AmazonLogging.AmazonLoggingLevel.Verbose, "CognitoSyncManager", e);
FireSyncFailureEvent(e);
callback(new RunSyncOperationResponse(false, listUpdatesResult.Exception));
return;
}
ListUpdatesResponse listUpdatesResponse = listUpdatesResult.Response as ListUpdatesResponse;
datasetUpdates = listUpdatesResponse.DatasetUpdates;
if (datasetUpdates.MergedDatasetNameList.Count != 0 && this.OnDatasetMerged != null)
{
bool resume = this.OnDatasetMerged(this, datasetUpdates.MergedDatasetNameList);
if (resume)
{
this.RunSyncOperationAsync(--retry, callback);
return;
}
else
{
AmazonLogging.Log(AmazonLogging.AmazonLoggingLevel.Verbose, "CognitoSyncManager", "OnSyncFailure: Manual cancel");
FireSyncFailureEvent(new DataStorageException("Manual cancel"));
callback(new RunSyncOperationResponse(false, null));
return;
}
}
// if the dataset doesn't exist or is deleted, trigger onDelete
if (lastSyncCount != 0 && !datasetUpdates.Exists ||
datasetUpdates.Deleted && this.OnDatasetDeleted != null)
{
bool resume = this.OnDatasetDeleted(this);
if (resume)
{
// remove both records and metadata
_local.DeleteDataset(GetIdentityId(), _datasetName);
_local.PurgeDataset(GetIdentityId(), _datasetName);
AmazonLogging.Log(AmazonLogging.AmazonLoggingLevel.Verbose, "CognitoSyncManager", "OnSyncSuccess");
FireSyncSuccessEvent(new List <Record>());
callback(new RunSyncOperationResponse(true, null));
return;
}
else
{
AmazonLogging.Log(AmazonLogging.AmazonLoggingLevel.Verbose, "CognitoSyncManager", "OnSyncFailure");
FireSyncFailureEvent(new DataStorageException("Manual cancel"));
callback(new RunSyncOperationResponse(false, null));
return;
}
}
List <Record> remoteRecords = datasetUpdates.Records;
if (remoteRecords.Count != 0)
{
// if conflict, prompt developer/user with callback
List <SyncConflict> conflicts = new List <SyncConflict>();
List <Record> conflictRecords = new List <Record>();
foreach (Record remoteRecord in remoteRecords)
{
Record localRecord = _local.GetRecord(GetIdentityId(),
_datasetName,
remoteRecord.Key);
// only when local is changed and its value is different
if (localRecord != null && localRecord.Modified &&
!StringUtils.Equals(localRecord.Value, remoteRecord.Value))
{
conflicts.Add(new SyncConflict(remoteRecord, localRecord));
conflictRecords.Add(remoteRecord);
}
}
// retaining only non-conflict records
remoteRecords.RemoveAll(t => conflictRecords.Contains(t));
if (conflicts.Count > 0)
{
AmazonLogging.Log(AmazonLogging.AmazonLoggingLevel.Verbose, "CognitoSyncManager", String.Format("{0} records in conflict!", conflicts.Count));
bool syncConflictResult = false;
if (this.OnSyncConflict == null)
{
// delegate is not implemented so the conflict resolution is applied
syncConflictResult = this.DefaultConflictResolution(conflicts);
}
else
{
syncConflictResult = this.OnSyncConflict(this, conflicts);
}
if (!syncConflictResult)
{
AmazonLogging.Log(AmazonLogging.AmazonLoggingLevel.Verbose, "CognitoSyncManager", "User cancelled conflict resolution");
callback(new RunSyncOperationResponse(false, null));
return;
}
}
// save to local
if (remoteRecords.Count > 0)
{
AmazonLogging.Log(AmazonLogging.AmazonLoggingLevel.Verbose, "CognitoSyncManager", String.Format("save {0} records to local", remoteRecords.Count));
_local.PutRecords(GetIdentityId(), _datasetName, remoteRecords);
}
// new last sync count
AmazonLogging.Log(AmazonLogging.AmazonLoggingLevel.Verbose, "CognitoSyncManager", String.Format("updated sync count {0}", datasetUpdates.SyncCount));
_local.UpdateLastSyncCount(GetIdentityId(), _datasetName,
datasetUpdates.SyncCount);
}
// push changes to remote
List <Record> localChanges = this.GetModifiedRecords();
if (localChanges.Count != 0)
{
AmazonLogging.Log(AmazonLogging.AmazonLoggingLevel.Verbose, "CognitoSyncManager", String.Format("push {0} records to remote", localChanges.Count));
_remote.PutRecordsAsync(_datasetName, localChanges,
datasetUpdates.SyncSessionToken, delegate(AmazonCognitoResult putRecordsResult)
{
if (putRecordsResult.Exception != null)
{
if (putRecordsResult.Exception.GetType() == typeof(DataConflictException))
{
AmazonLogging.LogError(AmazonLogging.AmazonLoggingLevel.Warnings, "CognitoSyncManager", "Conflicts detected when pushing changes to remote: " + putRecordsResult.Exception.Message);
this.RunSyncOperationAsync(--retry, callback);
return;
}
else if (putRecordsResult.Exception.GetType() == typeof(DataStorageException))
{
AmazonLogging.LogError(AmazonLogging.AmazonLoggingLevel.Verbose, "CognitoSyncManager", "OnSyncFailure" + putRecordsResult.Exception.Message);
FireSyncFailureEvent(putRecordsResult.Exception);
callback(new RunSyncOperationResponse(false, null));
return;
}
}
PutRecordsResponse putRecordsResponse = putRecordsResult.Response as PutRecordsResponse;
List <Record> result = putRecordsResponse.UpdatedRecords;
// update local meta data
_local.PutRecords(GetIdentityId(), _datasetName, result);
// verify the server sync count is increased exactly by one, aka no
// other updates were made during this update.
long newSyncCount = 0;
foreach (Record record in result)
{
newSyncCount = newSyncCount < record.SyncCount
? record.SyncCount
: newSyncCount;
}
if (newSyncCount == lastSyncCount + 1)
{
AmazonLogging.Log(AmazonLogging.AmazonLoggingLevel.Info, "DefaultDataset",
String.Format("updated sync count %d", newSyncCount));
_local.UpdateLastSyncCount(GetIdentityId(), _datasetName,
newSyncCount);
}
AmazonLogging.Log(AmazonLogging.AmazonLoggingLevel.Verbose, "CognitoSyncManager", "OnSyncSuccess");
// call back
FireSyncSuccessEvent(remoteRecords);
callback(new RunSyncOperationResponse(true, null));
return;
}, null);
return;
}
AmazonLogging.Log(AmazonLogging.AmazonLoggingLevel.Verbose, "CognitoSyncManager", "OnSyncSuccess");
// call back
FireSyncSuccessEvent(remoteRecords);
callback(new RunSyncOperationResponse(true, null));
return;
}, null);
}
