private IValueDescriptor <Entry> WrapValueDescriptor(IValueDescriptor <V> evictableValueDescriptor)
{
return(new ValueDescriptorImpl <Entry>(
entry =>
{
return entry.ValueRef.Valid ?
evictableValueDescriptor.GetSizeInBytes(entry.ValueRef.Get()) : 0;
}));
}
/// <summary>
/// Checks the cache constraints to determine whether the new value
/// can be cached or not.
/// </summary>
private bool CanCacheNewValue(V value)
{
lock (_cacheGate)
{
int newValueSize = _valueDescriptor.GetSizeInBytes(value);
return((newValueSize <= _memoryCacheParams.MaxCacheEntrySize) &&
(InUseCount <= _memoryCacheParams.MaxCacheEntries - 1) &&
(InUseSizeInBytes <= _memoryCacheParams.MaxCacheSize - newValueSize));
}
}
private int GetValueSizeInBytes(V value)
{
return((value == null) ? 0 : _valueDescriptor.GetSizeInBytes(value));
}