T Execute <T, T2>(RestRequestWithCache request, Func <IRestResponse <T2>, T> selector)
where T : class, new()
where T2 : class, new()
{
var cacheStyle = request.CacheSyle;
var restClient = CreateClient();
switch (cacheStyle)
{
case RestRequestWithCache.CacheStyle.None:
break;
case RestRequestWithCache.CacheStyle.Immutable:
var item = cache.Get(CacheKey(restClient, request));
if (item != null)
{
return((T)item);
}
break;
case RestRequestWithCache.CacheStyle.IfNotModified:
var obj = cache.Get(CacheKey(restClient, request));
if (obj != null)
{
var tuple = (Tuple <string, T>)obj;
request.AddHeader("If-None-Match", tuple.Item1);
}
break;
}
LogRequest(request);
var response = restClient.Execute <T2>(request);
var data = default(T);
switch (cacheStyle)
{
case RestRequestWithCache.CacheStyle.Immutable:
if (response.StatusCode == HttpStatusCode.OK)
{
data = ProcessResponse(selector, response);
cache.Set(CacheKey(restClient, request), data, new CacheItemPolicy());
}
break;
case RestRequestWithCache.CacheStyle.IfNotModified:
switch (response.StatusCode)
{
case HttpStatusCode.OK:
data = ProcessResponse(selector, response);
var etag = response.Headers.FirstOrDefault(h => h.Name == "ETag");
if (etag != null)
{
cache.Set(CacheKey(restClient, request), Tuple.Create(etag.Value.ToString(), data), new CacheItemPolicy());
}
break;
case HttpStatusCode.NotModified:
LogResponse(response);
var obj = cache.Get(CacheKey(restClient, request));
if (obj != null)
{
var tuple = (Tuple <string, T>)obj;
data = tuple.Item2;
}
break;
}
break;
default:
data = ProcessResponse(selector, response);
break;
}
return(data);
}
