private static TimeSpan?GetTtl(CacheConfiguration config, MessageExchange exchange)
{
if (config.Ttl != null)
{
return(config.Ttl.Value);
}
var expiresHeader = Headers.GetString(exchange.In.Headers, Headers.Expires);
if (!string.IsNullOrEmpty(expiresHeader))
{
var expiration = Expires.Parse(expiresHeader);
if (expiration != null)
{
if (expiration.Period != null)
{
return(expiration.Period);
}
var now = DateTimeOffset.Now;
if (expiration.Date != null && expiration.Date.Value > now)
{
return(expiration.Date.Value - now);
}
}
}
return(null);
}
/// <inheritdoc />
public void Reply <TResponse>(TResponse response, Expires expires = null) where TResponse : class
{
if ((this.cacheConfiguration.Enabled ?? false) && this.cacheConfiguration.Ttl != null)
{
this.cacheConfiguration.Cache.Set(this.context.Message, response, this.cacheConfiguration.Ttl.Value);
}
this.context.Reply(response, expires);
}
/// <summary>
/// Если в кеше, есть ответное сообщение на входящее сообщение, тогда возвращает объект из кеша.
/// </summary>
/// <param name="exchange">Конвейер обработки сообщений.</param>
/// <param name="invoker">Фильтры вызывающий конвейер.</param>
/// <returns>Задача обработки сообщений.</returns>
public Task <MessageExchange> Process(MessageExchange exchange, MessageExchangeFilterInvoker invoker)
{
if (!exchange.IsIncompleteRequest)
{
return(invoker.Continue(exchange));
}
string hash = this.hasher.CalculateHashOf(exchange.Out).ToString();
Maybe <object> cached = this.cacheProvider.Find <object>(hash);
if (cached.HasValue)
{
exchange.In = new Message(MessageLabel.Empty, cached.Value);
return(Filter.Result(exchange));
}
return(invoker.Continue(exchange)
.ContinueWith(
t =>
{
MessageExchange resultExchange = t.Result;
if (!resultExchange.IsCompleteRequest)
{
return resultExchange;
}
string expiresHeader = Headers.GetString(resultExchange.In.Headers, Headers.Expires);
if (!string.IsNullOrEmpty(expiresHeader))
{
Expires expiration = Expires.Parse(expiresHeader);
if (expiration.Period.HasValue)
{
this.cacheProvider.Put(hash, resultExchange.In.Payload, expiration.Period.Value);
}
else
{
this.cacheProvider.Put(hash, resultExchange.In.Payload, expiration.Date.Value);
}
}
return resultExchange;
}));
}