private PostcodeLookupViewModel ViewModelFromResult(Location result, TimeSpan?lookupTime, bool foundInCache = false)
{
var viewModel = new PostcodeLookupViewModel
{
Postcode = result.Postcode,
IsTerminated = result.IsTerminated,
Latitude = result.Latitude,
Longitude = result.Longitude,
FoundInCache = foundInCache,
ElapsedTimeForLookup = lookupTime,
};
return(viewModel);
}
public async Task <IActionResult> LookupPostcodeWithDistributedCaching(PostcodeLookupViewModel viewModel)
{
if (!ModelState.IsValid)
{
return(View(nameof(Index), viewModel));
}
//https://dotnetcoretutorials.com/2017/01/06/using-redis-cache-net-core/
viewModel.UseCachedResponse = true;
var foundInCache = true;
var stopwatch = Stopwatch.StartNew();
var cacheKey = $"Postcode_{viewModel.Postcode.Replace(" ", "")}";
Location result;
var serializedLocation = await _distributedCache.GetStringAsync(cacheKey);
//Need to serialize to binary or string...
//https://docs.microsoft.com/en-us/aspnet/core/performance/caching/distributed?view=aspnetcore-3.1
if (serializedLocation != null)
{
result = JsonSerializer.Deserialize <Location>(serializedLocation);
}
else
{
foundInCache = false;
result = await _locationService.LookupPostcodeAsync(viewModel.Postcode);
var cacheEntryOptions = new DistributedCacheEntryOptions()
.SetSlidingExpiration(TimeSpan.FromSeconds(30));
serializedLocation = JsonSerializer.Serialize(result);
await _distributedCache.SetStringAsync(cacheKey, serializedLocation, cacheEntryOptions);
}
stopwatch.Stop();
//viewModel.Postcode = result.Postcode;
//viewModel.FoundInCache = foundInCache;
//viewModel.ElapsedTimeForLookup = stopwatch.Elapsed;
return(View("Index", ViewModelFromResult(result, stopwatch.Elapsed, foundInCache)));
}
public async Task <IActionResult> LookupPostcode(PostcodeLookupViewModel viewModel)
{
if (!ModelState.IsValid)
{
return(View(nameof(Index), viewModel));
}
var stopwatch = Stopwatch.StartNew();
var result = await _locationService.LookupPostcodeAsync(viewModel.Postcode);
stopwatch.Stop();
viewModel.Postcode = result.Postcode;
viewModel.ElapsedTimeForLookup = stopwatch.Elapsed;
return(View("Index", ViewModelFromResult(result, stopwatch.Elapsed)));
}
public async Task <IActionResult> LookupPostcodeWithMemoryCaching(PostcodeLookupViewModel viewModel)
{
if (!ModelState.IsValid)
{
return(View(nameof(Index), viewModel));
}
viewModel.UseCachedResponse = true;
var foundInCache = true;
var stopwatch = Stopwatch.StartNew();
var cacheKey = $"Postcode_{viewModel.Postcode.Replace(" ", "")}";
// Look for cache key.
if (!_memoryCache.TryGetValue(cacheKey, out Location result))
{
foundInCache = false;
result = await _locationService.LookupPostcodeAsync(viewModel.Postcode);
var cacheEntryOptions = new MemoryCacheEntryOptions()
.SetSlidingExpiration(TimeSpan.FromSeconds(30));
_memoryCache.Set(cacheKey, result, cacheEntryOptions);
}
stopwatch.Stop();
//viewModel.Postcode = result.Postcode;
//viewModel.IsTerminated = result.IsTerminated;
//viewModel.Latitude = result.Latitude;
//viewModel.Longitude = result.Longitude;
//viewModel.FoundInCache = foundInCache;
//viewModel.ElapsedTimeForLookup = stopwatch.Elapsed;
return(View("Index", ViewModelFromResult(result, stopwatch.Elapsed, foundInCache)));
}
