private async Task <ChangesResult <TDbEntity, TParseModelEntity> > GetChangesAsync <TDbEntity, TParseModelEntity>(
int trainingProviderId,
IEnumerable <TDbEntity> existingEntities,
Dictionary <IUrlNameNaturalKey, TParseModelEntity> processingEntitiesContainer,
IChangesDetector <TDbEntity, TParseModelEntity> changesDetector,
Func <int, TParseModelEntity, Task <TDbEntity> > entityMapper,
Action <TDbEntity, TParseModelEntity> keyAssignAction)
where TParseModelEntity : IUrlNameNaturalKey
where TDbEntity : IUrlNameNaturalKey
{
var unmodifiedEntities = new List <EntityPair <TDbEntity, TParseModelEntity> >();
var modifiedEntities = new List <EntityPair <TDbEntity, TParseModelEntity> >();
var deletedEntities = new List <TDbEntity>();
foreach (var existingEntity in existingEntities)
{
TParseModelEntity processingEntity;
if (processingEntitiesContainer.TryGetValue(existingEntity, out processingEntity))
{
// assign identity key of the existing entity to the processing entity
if (keyAssignAction != null)
{
keyAssignAction.Invoke(existingEntity, processingEntity);
}
if (changesDetector.IsDifferent(existingEntity, processingEntity))
{
modifiedEntities.Add(new EntityPair <TDbEntity, TParseModelEntity>(existingEntity, processingEntity));
}
else
{
unmodifiedEntities.Add(new EntityPair <TDbEntity, TParseModelEntity>(existingEntity, processingEntity));
}
// need to detect new entities
processingEntitiesContainer.Remove(existingEntity);
}
else
{
deletedEntities.Add(existingEntity);
}
}
var newEntities = new List <EntityPair <TDbEntity, TParseModelEntity> >();
foreach (var parseModelEntity in processingEntitiesContainer.Values)
{
var mappedEntity = await entityMapper.Invoke(trainingProviderId, parseModelEntity);
newEntities.Add(new EntityPair <TDbEntity, TParseModelEntity>(mappedEntity, parseModelEntity));
}
var changesResult = new ChangesResult <TDbEntity, TParseModelEntity>(unmodifiedEntities, modifiedEntities,
newEntities, deletedEntities);
return(changesResult);
}
/// <exception cref="UpdateProcessorException"></exception>
protected virtual async Task UpdateCategoriesAsync(ChangesResult <Category, TCategoryParseModel> categoriesChanges)
{
try
{
ProcessModifiedCategories(categoriesChanges.ModifiedEntities);
ProcessDeletedCategories(categoriesChanges.DeletedEntities);
await ProcessNewCategories(categoriesChanges.NewEntities);
}
catch (Exception ex)
{
throw new UpdateProcessorException(Resources.UpdateProcessorException_CategoriesUpdate_Message, ex);
}
}
/// <exception cref="UpdateProcessorException"></exception>
protected virtual async Task UpdateCoursesAsync(ChangesResult <Course, TCourseParseModel> coursesChanges, List <AuthorResolve> authorResolves)
{
try
{
ProcessCategoryAndAuthorsChangesForUnmodifiedCourses(coursesChanges.UnmodifiedEntities, authorResolves);
ProcessModifiedCourses(coursesChanges.ModifiedEntities, authorResolves);
ProcessDeletedCourses(coursesChanges.DeletedEntities);
await ProcessNewCourses(coursesChanges.NewEntities, authorResolves);
}
catch (Exception ex)
{
throw new UpdateProcessorException(Resources.UpdateProcessorException_CoursesUpdate_Message, ex);
}
}
/// <exception cref="UpdateProcessorException"></exception>
protected virtual async Task UpdateAuthorsAsync(ChangesResult <TrainingProviderAuthor, TAuthorParseModel> authorsChanges, List <AuthorResolve> authorResolves)
{
try
{
ProcessModifiedAuthors(authorsChanges.ModifiedEntities);
ProcessDeletedAuthors(authorsChanges.DeletedEntities, authorResolves);
await ProcessNewAuthors(authorsChanges.NewEntities);
}
catch (Exception ex)
{
throw new UpdateProcessorException(Resources.UpdateProcessorException_AuthorsUpdate_Message, ex);
}
}