feature: channels with priorities

[nopeslide]

Related Issues & PRs

• esp: Added basic implemetation of message passing structure #47

Description

• Broadcasting does not differentiate between consumers with different priorities.
• This could lead to uncritical consumers blocking critical consumers.
• Broadcast timeout returns no metric if timeout is acceptable

Solution

• introduce priority for each channel
  • define priorities groups
    • i.e. 0000 - 1000 is uncritical debug output
    • i.e. 1000 - 2000 is kind of critical user interface output
    • i.e. 2000 - 9999 is critical data flow
• channel insertion sorts channels in same list by priorities
  • no overhead while broadcasting
• broadcast runs from highest to lowest priority
• broadcast updates its handle with last served priority
  • enables check if all system critical consumers were called by comparing the last priority to the priority groups

Alternative solutions

• none

Context

none