public async override Task OnActionExecutedAsync(HttpActionExecutedContext actionExecutedContext, CancellationToken cancellationToken)
{
//if current request is GET, there is no errors, and expiration date > now
if (actionExecutedContext.Request.Method.Method.ToUpper() == "GET" &&
actionExecutedContext.Response.IsSuccessStatusCode && _expirationDate > DateTime.Now)
{
var key = GenerateCacheKey(actionExecutedContext.ActionContext);
var contentType = actionExecutedContext.Response.Content.Headers.ContentType;
var value = await(actionExecutedContext.Response.Content as ObjectContent).ReadAsByteArrayAsync().ConfigureAwait(false);
//create cache holder and add it to memory list
var cacheHolder = new CacheHolder(_expirationDate, value, key, contentType);
GalileoMemoryStorage.Add(cacheHolder, key, _expirationDate);
//set cache control header for clients to know that content is cached
var secondsLeft = Math.Round((GalileoMemoryStorage.Get(key).ExpirationDate - DateTime.Now).TotalSeconds);
actionExecutedContext.Response.Headers.Add("Cache-Control", string.Format("max-age={0}", secondsLeft));
actionExecutedContext.Response.Headers.Add("ETag", string.Format("\"{0}\"", cacheHolder.ETag));
}
await base.OnActionExecutedAsync(actionExecutedContext, cancellationToken);
}
public async override Task OnActionExecutingAsync(HttpActionContext actionContext, CancellationToken cancellationToken)
{
var key = GenerateCacheKey(actionContext);
//if cache contains element which did not expire, inject it back to response
if (GalileoMemoryStorage.Contains(key))
{
var memoryItem = GalileoMemoryStorage.Get(key);
actionContext.Response = actionContext.Request.CreateResponse(HttpStatusCode.OK);
actionContext.Response.Content = new ByteArrayContent(memoryItem.Value);
actionContext.Response.Content.Headers.ContentType = memoryItem.ContentType;
//set cache control header for clients to know that content is cached
var secondsLeft = Math.Round((memoryItem.ExpirationDate - DateTime.Now).TotalSeconds);
actionContext.Response.Headers.Add("Cache-Control", string.Format("max-age={0}", secondsLeft));
actionContext.Response.Headers.Add("ETag", string.Format("\"{0}\"", memoryItem.ETag));
return;
}
await base.OnActionExecutingAsync(actionContext, cancellationToken);
}
