public override void OnActionExecuting(System.Web.Http.Controllers.HttpActionContext actionContext)
{
if (actionContext.Request.Method == HttpMethod.Get && this.CacheKey != CacheKey.NO_CACHE)
{
Models.CacheContainer c = CacheManager.Instance.Retreive(this.CacheKey);
if (c != null && c.ETag != null)
{
if (actionContext.Request.Headers.IfNoneMatch != null)
{
if (actionContext.Request.Headers.IfNoneMatch.Any(x => x.Tag.Contains(c.ETag)))
{
// user has already received data response so send back as 304 and client will use cache...
actionContext.Response = actionContext.Request.CreateResponse(System.Net.HttpStatusCode.NotModified);
SetEtag(actionContext.Response, c.ETag);
return;
}
}
// user did not send ETag... maybe new user so set the content and ETag and send back...
actionContext.Response = actionContext.Request.CreateResponse(
System.Net.HttpStatusCode.OK,
c.Data,
actionContext.ControllerContext.Configuration.Formatters.JsonFormatter
);
SetEtag(actionContext.Response, c.ETag);
// since this is users first time receiving this response... cache it in browser
ApplyCacheHeaders(actionContext.Response, TimeSpan.FromSeconds(this.ClientDuration));
return;
}
}
}
public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
{
if (actionExecutedContext.Request.Method == HttpMethod.Get && actionExecutedContext.Response.IsSuccessStatusCode)
{
if (this.CacheKey != CacheKey.NO_CACHE)
{
string eTag = CreateEtag(actionExecutedContext, this.CacheKey.ToString());
SetEtag(actionExecutedContext.Response, eTag);
Models.CacheContainer c = CacheManager.Instance.Retreive(this.CacheKey);
if (null == c)
{
c = new Models.CacheContainer();
}
c.ETag = eTag;
c.Data = GetResponseContent(actionExecutedContext);
CacheManager.Instance.Store(this.CacheKey, c);
}
ApplyCacheHeaders(actionExecutedContext.Response, TimeSpan.FromSeconds(this.ClientDuration));
}
}
