otp

[nanne007]

GenServer

Client

• start_link
• call
• cast
• info
• stop

  Server

• init
• handle_call -handle_cast
• handle_info
• terminate
• code_change

[nanne007]

Supervisor

supervisor:start_link

Supervisor Flags

• strategy: restart strategy, default to one_for_one
  • one_for_all
  • one_for_one
  • rest_for_one
  • simple_one_for_one
• intensity
• period

Maximum Restart Intensity

limit the number of restarts which can occur in a given time interval

• the number: intensity => MaxR, default to 1
• the time interval: period => MaxT, default to 5

Child Specs

• id:
• start: mfa
• restart: default to permanent.
• shutdown:
  • for worker, default to 5s
  • for supervisor, default to infinity
• type: worker | supervisor