/// <summary>
/// Write a cache data to the cache store.
/// </summary>
public async Task WriteAsync(MetadataService service, ConsumerRequest request, Metadata metadata)
{
var u = request.Url.ToString();
if (metadata == null)
{
await _Cache.RemoveAsync(u).ConfigureAwait(false);
}
else
{
using (var ms = new MemoryStream())
{
XamlServices.Save(ms, metadata);
await _Cache.SetAsync(u, ms.ToArray()).ConfigureAwait(false);
}
}
}
/// <summary>
/// Writes the <see cref="Metadata" /> to to the cache store.
/// </summary>
public async Task WriteAsync(MetadataService service, ConsumerRequest request, Metadata metadata)
{
if (metadata == null)
{
_Cache.Remove(request.Url);
}
else
{
_Cache.Set(request.Url, metadata, new MemoryCacheEntryOptions()
{
SlidingExpiration = TimeSpan.FromMinutes(60)
});
}
if (_Distributed != null)
{
await _Distributed.WriteAsync(service, request, metadata).ConfigureAwait(false);
}
}
/// <summary>
/// Reads the cached <see cref="Metadata" /> for the URL of <paramref name="request"/>.
/// </summary>
/// <param name="service">The <see cref="MetadataService" /> reading cache.</param>
/// <param name="request">The consumer request.</param>
/// <returns>The task object representing the asynchronous operation.
/// The <see cref="Task{TResult}.Result"/> property on the task object returns a cached <see cref="Metadata"/>.</returns>
public async Task <Metadata> ReadAsync(MetadataService service, ConsumerRequest request)
{
if (!_Cache.TryGetValue(request.Url, out Metadata r))
{
if (_Distributed != null)
{
r = await _Distributed.ReadAsync(service, request).ConfigureAwait(false);
if (r != null)
{
_Cache.Set(request.Url, r, new MemoryCacheEntryOptions()
{
SlidingExpiration = TimeSpan.FromMinutes(60)
});
}
}
}
return(r);
}
/// <summary>
/// Initializes a new instance of the <see cref="HttpMetadataHandler" /> class.
/// </summary>
public HttpMetadataHandler(ILoggerFactory loggerFactory, MetadataService service)
{
_Logger = loggerFactory.CreateLogger <HttpMetadataHandler>();
_Service = service;
}