At one point, I did a similar thing for a computer vision system I was working on. That was quite naturally a filter graph: every component was time-dependent,

At one point, I did a similar thing for a computer vision system I was working on. That was quite naturally a filter graph: every component was time-dependent, caching and logging was important (rewind to find this blob 5 minutes ago), and parallelism was crucial because the system had to deal with synchronizing multiple IP cameras. Amazingly, it was possible to do this in an entirely safe way in C++, with templates. I wish I could put the code up on github, but unfortunately the company got taken apart and sold, so the code is in limbo.