/// <summary>
/// If an entry already exists in the cache, it will be overwritten. It will throw an exception for a null data reference.
/// </summary>
public void Store(CachedPostIndexContent data)
{
if (data == null)
{
throw new ArgumentNullException(nameof(data));
}
try
{
using var memoryStream = new MemoryStream();
using (var compressedStream = new GZipStream(memoryStream, CompressionMode.Compress))
{
new BinaryFormatter().Serialize(compressedStream, data);
}
var serialisedData = memoryStream.ToArray();
using var fileStream = File.Open(_dataFile.FullName, FileMode.Create);
fileStream.Write(serialisedData, 0, serialisedData.Length);
}
catch
{
// Ignore any errors - if access is denied then there's nothing we can do, just push on
}
}
private CachedPostIndexContent GetData(NonNullImmutableList <Post> posts)
{
if (posts == null)
{
throw new ArgumentNullException(nameof(posts));
}
var cachedData = _cache.TryToRetrieve();
if ((cachedData != null) && cachedData.IsValidForPostsData(posts))
{
return(cachedData);
}
var postIndexData = _postIndexer.GenerateIndexContent(posts);
var liveData = new CachedPostIndexContent(
postIndexData,
posts
);
_cache.Store(liveData);
return(liveData);
}
/// <summary>
/// If an entry already exists in the cache, it will be overwritten. It will throw an exception for a null data reference.
/// </summary>
public void Store(CachedPostIndexContent data)
{
// Ensure that any existing entry is removed before adding a new one (for cases where existing content contains expired data)
_cache.Remove(CacheKey);
_cache[CacheKey] = data ?? throw new ArgumentNullException(nameof(data));
}
