private bool TooOld(CacheEnvelope cacheEnvelope)
{
if (Options.AbsoluteExpirationRelativeToNow == null)
{
return(false);
}
return(cacheEnvelope.UpdatedAt.Add(Options.AbsoluteExpirationRelativeToNow.Value) <= DateTimeOffset.Now);
}
private UseCacheStrategyEnum GetCacheItemStrategy(CacheEnvelope cacheEnvelope)
{
InternalContract.RequireNotNull(cacheEnvelope, nameof(cacheEnvelope));
if (cacheEnvelope.CacheIdentity != CacheIdentity)
{
return(UseCacheStrategyEnum.Remove);
}
return(TooOld(cacheEnvelope) ? UseCacheStrategyEnum.Remove : UseCacheStrategyEnum.Use);
}
/// <summary>
/// Serialize the <paramref name="item"/>, put it into an envelope and serialize the envelope
/// </summary>
public byte[] ToSerializedCacheEnvelope <T>(T item)
{
var serializedItem = SerializingSupport.Serialize(item);
var cacheEnvelope = new CacheEnvelope
{
CacheIdentity = CacheIdentity,
UpdatedAt = DateTimeOffset.Now,
Data = serializedItem
};
var serializedCacheEnvelope = SerializingSupport.Serialize(cacheEnvelope);
return(serializedCacheEnvelope);
}
private async Task <UseCacheStrategyEnum> GetCacheItemStrategyAsync(TId id, CacheEnvelope cacheEnvelope, CancellationToken token)
{
InternalContract.RequireNotDefaultValue(id, nameof(id));
InternalContract.RequireNotNull(cacheEnvelope, nameof(cacheEnvelope));
var cacheItemStrategy = GetCacheItemStrategy(cacheEnvelope);
if (cacheItemStrategy != UseCacheStrategyEnum.Use)
{
return(cacheItemStrategy);
}
if (UseCacheStrategyMethodAsync == null)
{
return(UseCacheStrategyEnum.Use);
}
var cachedItemInformation = new CachedItemInformation <TId>
{
Id = id,
UpdatedAt = cacheEnvelope.UpdatedAt
};
return(await UseCacheStrategyMethodAsync(cachedItemInformation, token));
}
