public interface ISocketMessageParser
{
    bool AppliesTo(SocketMessage message);
    object Parse(Type type, SocketMessage message);
}

public class DefaultSocketMessageParser : ISocketMessageParser
{
    private readonly IJsonService _jsonService;

    public DefaultSocketMessageParser(IJsonService jsonService)
    {
        _jsonService = jsonService;
    }

    public bool AppliesTo(SocketMessage message)
    {
        return true;
    }

    public object Parse(Type type, SocketMessage message)
    {
        return _jsonService.Deserialize(type, message.Message);
    }
}