private async Task <PaginatedList <ContactDto> > ReadFromCache(FilterQuery request)
{
var cache = await _cache.GetAsync <PaginatedList <ContactDto> >();
cache.Restore(request.PageNumber, request.PageSize);
return(cache);
}
public async Task <PaginatedList <ContactDto> > Handle(FilterQuery request,
CancellationToken cancellationToken)
{
try
{
return(await ReadFromCache(request));
}
catch (NotFoundException)
{
return(await ReadFromDatabase(request));
}
}
// Helpers.
private async Task <PaginatedList <ContactDto> > ReadFromDatabase(FilterQuery query, object key)
{
var model = new ContactDto
{
OwnerUserId = query.OwnerUserId,
FirstName = query.FirstName ?? string.Empty,
LastName = query.LastName ?? string.Empty,
Email = query.Email ?? string.Empty
};
return(await _context.Contacts
.Where(e => e.OwnerUserId == query.OwnerUserId)
.ProjectTo <ContactDto>(_mapper.ConfigurationProvider)
.Where(await model.FilterAsync())
.ProjectToPaginatedListAsync(query.PageNumber, query.PageSize)
.MapUsersAsync(_usersFacade)
.Cache(_cache, key));
}
public async Task <PaginatedList <ContactDto> > Handle(FilterQuery query, CancellationToken cancellationToken)
{
var key = query.Identify();
try
{
_logger.LogInformation("[WLODZIMIERZ.API / Contacts] Reading from the cache: {Name} {@Query}",
nameof(FilterQuery), query);
return(await ReadFromCache(key));
}
catch (NotFoundException)
{
_logger.LogWarning("[WLODZIMIERZ.API / Contacts] No entry found for the passed key in the cache");
_logger.LogInformation("[WLODZIMIERZ.API / Contacts] Reading from the database: {Name} {@Query}",
nameof(FilterQuery), query);
return(await ReadFromDatabase(query, key));
}
}
// Helpers.
private async Task <PaginatedList <ContactDto> > ReadFromDatabase(FilterQuery query)
{
var model = new ContactDto
{
ContactId = query.ContactId ?? 0,
OwnerUserId = query.OwnerUserId,
FirstName = query.FirstName ?? string.Empty,
LastName = query.LastName ?? string.Empty,
Email = query.Email ?? string.Empty
};
var contacts = await _context.Contacts
.Where(e => e.OwnerUserId == query.OwnerUserId)
.ProjectTo <ContactDto>(_mapper.ConfigurationProvider)
.Where(await model.FilterAsync())
.PaginatedListAsync(query.PageNumber, query.PageSize);
await _cache.CreateAsync(contacts);
return(contacts);
}