/// <summary>
/// Used during serialization to compress properties
/// </summary>
/// <param name="model"></param>
/// <remarks>
/// This will essentially 'double compress' property data. The MsgPack data as a whole will already be compressed
/// but this will go a step further and double compress property data so that it is stored in the nucache file
/// as compressed bytes and therefore will exist in memory as compressed bytes. That is, until the bytes are
/// read/decompressed as a string to be displayed on the front-end. This allows for potentially a significant
/// memory savings but could also affect performance of first rendering pages while decompression occurs.
/// </remarks>
private void Compress(IReadOnlyContentBase content, ContentCacheDataModel model)
{
foreach (var propertyAliasToData in model.PropertyData)
{
if (_propertyOptions.IsCompressed(content, propertyAliasToData.Key))
{
foreach (var property in propertyAliasToData.Value.Where(x => x.Value != null && x.Value is string))
{
property.Value = LZ4Pickler.Pickle(Encoding.UTF8.GetBytes((string)property.Value), LZ4Level.L00_FAST);
}
}
}
}
/// <summary>
/// Used during deserialization to map the property data as lazy or expand the value
/// </summary>
/// <param name="content"></param>
/// <param name="nestedData"></param>
/// <param name="published"></param>
private void Expand(IReadOnlyContentBase content, ContentCacheDataModel nestedData, bool published)
{
foreach (var propertyAliasToData in nestedData.PropertyData)
{
if (_propertyOptions.IsCompressed(content, propertyAliasToData.Key, published))
{
foreach (var property in propertyAliasToData.Value.Where(x => x.Value != null))
{
if (property.Value is byte[] byteArrayValue)
{
property.Value = new LazyCompressedString(byteArrayValue);
}
}
}
}
}
public ContentCacheDataSerializationResult Serialize(IReadOnlyContentBase content, ContentCacheDataModel model)
{
// note that numeric values (which are Int32) are serialized without their
// type (eg "value":1234) and JsonConvert by default deserializes them as Int64
var json = JsonConvert.SerializeObject(model);
return(new ContentCacheDataSerializationResult(json, null));
}
public ContentCacheDataSerializationResult Serialize(IReadOnlyContentBase content, ContentCacheDataModel model, bool published)
{
Compress(content, model, published);
var bytes = MessagePackSerializer.Serialize(model, _options);
return(new ContentCacheDataSerializationResult(null, bytes));
}
