public async Task <GuidDTO> Handle(CreateGUIDCommand request, CancellationToken cancellationToken)
{
//create rich domain object
var entity = new GuidMetadata(request.Id, request.Expire, request.User);
//add to database and save
try
{
_context.Add(entity);
await _context.SaveChangesAsync(cancellationToken);
}
catch (System.Exception ex)
{
throw ex;
}
//create cache
try
{
var cacheKey = entity.Id;
var cacheMetadata = entity.Expire + "|" + entity.User;
await _cache.SetStringAsync(cacheKey, cacheMetadata, cancellationToken);
}
catch (System.Exception ex)
{
throw ex;
}
//map to dto and return
return(GuidDTO.Create(entity));
}
public async Task <Unit> Handle(DeleteGUIDCommand request, CancellationToken cancellationToken)
{
//soft delete from database
var entity = await _context.GUIDs.SingleAsync(c => c.Id == request.Id, cancellationToken);
entity.IsDeleted = true;
_context.Entry(entity).Property("IsDeleted").IsModified = true;
await _context.SaveChangesAsync(cancellationToken);
//delete cache
var cacheKey = request.Id;
await _distributedCache.RemoveAsync(cacheKey, cancellationToken);
//return void
return(Unit.Value);
}
public async Task <GuidDTO> Handle(UpdateGUIDCommand request, CancellationToken cancellationToken)
{
//create rich domain object, bypass null or empty name validation
var entity = new GuidMetadata(request.Id, request.Expire, request.User ?? "N/A", request.IsDeleted);
//modify database and save changes
if (request.Expire != null)
{
_context.Entry(entity).Property("Expire").IsModified = true;
}
if (request.User != null)
{
_context.Entry(entity).Property("User").IsModified = true;
}
if (request.IsDeleted != null)
{
_context.Entry(entity).Property("IsDeleted").IsModified = true;
}
await _context.SaveChangesAsync(cancellationToken);
//get existing cache
var cacheKey = request.Id;
var cache = _distributedCache.GetString(cacheKey);
//update existing cache
string cacheMetadata;
if (cache != null)
{
var data = cache.Split("|");
var expire = data[0].ToString();
var user = data[1].ToString();
cacheMetadata = string.Concat(entity.Expire != null ? entity.Expire.ToString() : expire, "|"
, entity.User != null ? entity.User : user);
await _distributedCache.SetStringAsync(cacheKey, cacheMetadata, cancellationToken);
}
//map to dto and return
return(GuidDTO.Create(entity));
}
