// This method ensures that we have a valid feed through the formatters. The BodyWriter delegate in WCF
// seems to not recover from an unhandled exception caused by the formatters and sends out an empty response to the caller.
// This is a workaround for this issue until we find a better solution.
private SyncWriter GetSyncWriterWithContents()
{
// Get the appropriate SyncWriter instance based on the serialization format.
SyncWriter oDataWriter = WebUtil.GetSyncWriter(_responseSerializationFormat, _baseUri);
oDataWriter.StartFeed(_getChangesResponse.IsLastBatch, _getChangesResponse.ServerBlob);
// Write entities for response.
foreach (var entity in _getChangesResponse.EntityList)
{
// Set the Id and add item with a null tempId.
entity.ServiceMetadata.Id = WebUtil.GenerateOfflineEntityId(entity);
oDataWriter.AddItem(entity, null /*tempId*/);
}
return(oDataWriter);
}
// This method ensures that we have a valid feed through the formatters. The BodyWriter delegate in WCF
// seems to not recover from an unhandled exception caused by the formatters and sends out an empty response to the caller.
// This is a workaround for this issue until we find a better solution.
private SyncWriter GetSyncWriterWithContents()
{
var conflictEntryKeys = new List <string>();
var errorEntryKeys = new List <string>();
var primaryKeyToIncomingEntitiesMapping = new Dictionary <string, IOfflineEntity>();
// Save the mapping between entity PK string -> entity
foreach (var entity in _incomingEntities)
{
string primaryKey = ReflectionUtility.GetPrimaryKeyString(entity);
if (primaryKeyToIncomingEntitiesMapping.ContainsKey(primaryKey))
{
throw SyncServiceException.CreateInternalServerError(Strings.MultipleEntriesWithSamePrimaryKeyInIncomingRequest);
}
primaryKeyToIncomingEntitiesMapping.Add(primaryKey, entity);
}
if (_rejectedEntities != null)
{
foreach (var entity in _rejectedEntities.Keys)
{
string primaryKey = ReflectionUtility.GetPrimaryKeyString(entity);
if (primaryKeyToIncomingEntitiesMapping.ContainsKey(primaryKey))
{
throw SyncServiceException.CreateInternalServerError(Strings.MultipleEntriesWithSamePrimaryKeyInIncomingRequest);
}
primaryKeyToIncomingEntitiesMapping.Add(primaryKey, entity);
}
}
// Get the appropriate SyncWriter instance based on the serialization format.
var oDataWriter = WebUtil.GetSyncWriter(_responseSerializationFormat, _baseUri);
oDataWriter.StartFeed(_applyChangesResponse.IsLastBatch, _applyChangesResponse.ServerBlob);
// Write conflict entities.
foreach (var entity in _applyChangesResponse.Conflicts)
{
// Add the primary key string to the conflictEntryKey list.
// The primary keys are the same for both Live and Losing entities.
conflictEntryKeys.Add(ReflectionUtility.GetPrimaryKeyString(entity.LiveEntity));
string tempId;
// If the client change lost, then we need to set the Id property
// only if the property was not null/empty in the incoming request.
string entityId = WebUtil.GenerateOfflineEntityId(entity.LiveEntity);
// Set the Id property of the Live entity (server's copy).
entity.LiveEntity.ServiceMetadata.Id = entityId;
// Set the Id property of the Losing entity to the incoming entity's Id value
entity.LosingEntity.ServiceMetadata.Id = entityId;
// get the original tempId. Null value is ok.
_idToTempIdMapping.TryGetValue(entityId, out tempId);
if (entity.Resolution == SyncConflictResolution.ServerWins)
{
// The losing entity is the client's copy.
// When resolution is ServerWins, we only need to set the losing change tempId.
oDataWriter.AddConflictItem(entity.LiveEntity, null /*tempId*/, entity.LosingEntity, tempId, entity.Resolution);
}
// If the client change won, then just set the Id property since an insert would have succeeded.
else
{
// When resolution is ClientWins, we only need to set the LiveEntity tempId.
oDataWriter.AddConflictItem(entity.LiveEntity, tempId, entity.LosingEntity, null /* tempId */, entity.Resolution);
}
}
// Write error entities.
foreach (var syncError in _applyChangesResponse.Errors)
{
Debug.Assert(null != syncError.LiveEntity);
Debug.Assert(null != syncError.ErrorEntity);
string entityId = WebUtil.GenerateOfflineEntityId(syncError.LiveEntity);
// Set the Id for Live and Losing entity.
syncError.LiveEntity.ServiceMetadata.Id = entityId;
syncError.ErrorEntity.ServiceMetadata.Id = entityId;
string primaryKeyString = ReflectionUtility.GetPrimaryKeyString(syncError.ErrorEntity);
// Add the string to the error key list.
errorEntryKeys.Add(primaryKeyString);
string tempId;
_idToTempIdMapping.TryGetValue(entityId, out tempId);
oDataWriter.AddErrorItem(syncError.LiveEntity, syncError.ErrorEntity, tempId, syncError.Description);
}
// Write all the inserted records here by iterating over the _incomingNewInsertEntities list
foreach (var entity in _incomingNewInsertEntities)
{
string entityTempId;
// Get the tempId of the entity.
_idToTempIdMapping.TryGetValue(WebUtil.GenerateOfflineEntityId(entity), out entityTempId);
// Write the output to the SyncWriter.
oDataWriter.AddItem(entity, entityTempId);
}
return(oDataWriter);
}
