Simple IoT Store


Currently, the store is made of up:

  • data stored to disk in a database (Genji)
  • a node cache
  • an edge cache

The caches are used to speed up read to nodes as loading them from the database is an expensive operation. We need to manage locking for concurrent access to the cache. Managing locking can be tricky as you need to figure out at what level to do the locking:

  1. lock entire functions at a high level
  2. only lock bits of code that access the cache data structures

It seems locking bits of code that access the data structures is more maintainable as then you can nest functions without worrying about deadlocks where the entire function locks. However, we likely have issues with in that the store does not do transactions when updating a point -- need to investigate this more.