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Anatomy of an elixir process and Actor Communication
Elixir processes are isolated, lightweight threads of execution that communicate by message passing. Each process has its own mailbox to receive messages and state to maintain as it processes messages. Messages can be sent either asynchronously with no reply expected, or synchronously to request a response. If a process does not respond within a specified time, the calling process will continue execution according to how it is programmed to handle non-responses. Processes may have multiple messages in their mailbox that are processed sequentially and can change state based on the messages received. If a process dies unexpectedly, it notifies its supervisor which decides how to handle the failure based on the restart strategy.
Anatomy of an elixir process and Actor Communication
- 1. Anatomy of anElixir Process 11/2016 by Mustafa Turan Erlang/Elixir Meetup Zendesk - Dublin
- 2. What’s an ElixirProcess? Elixir Process inside BEAM Actor Communication Summary 10 min @mustafaturan
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- 4. Erlang Virtual MachineOS Process(1) Process (2) Process (3) …. Process (n) Erlang VM -- pid 109 -- pid 206 -- pid 3114 -- ... STATE Mailbox CALCULATION FUNCTIONS (MSG LISTENERS) (pid 109) @mustafaturan
- 5. Sends a messagewith no- reply Christmas sales up to %90, come to our new store and start shopping! (GenServer.cast) Company A girl @mustafaturan Actor Communication Basic / one direction
- 6. Sends a message howr u? Responses to message Good! How r u? (GenServer.call) Mustafa Gozde @mustafaturan Actor Communication Basic / bi-directional
- 7. Sends a message MustafaGozde is unreachable! Changed her number or Out of charge or Airplane mode Mobile Operator Phone number is not available (GenServer.call) @mustafaturan Actor Communication No process
- 8. Sends a message (GenServer.call) Mustafahas a TTL of 1 minute! Also knows the message delivered She did not replied in one minute! What will Mustafa do? Mustafa Gozde Send another message? Try to reach her from other channels / call her? Go crazzy ???? He will behave like how you code it! @mustafaturan Actor Communication TTL / bi-directional
- 9. Sends a message#1 Mustafa Sendsa message#2 Mustafa’s Message Box(1) --------------------------------------- Message #1 from Gozde Gozde Other girl Mustafa’s Message Box(2) --------------------------------------- Message #1 from Gozde(*) Message #2 from Other Girl Mustafa’s Message Box(3) --------------------------------------- Message #2 from Other Girl Mustafa’s Message Box(4) --------------------------------------- *Processing not finished yet @mustafaturan Responses to message #1 Responses to message #2 Mustafa may change its state depending on messages.
- 10. Actor dies? What happensif the actor dies? Sends message to its supervisor - Down/Exit: - Depending on strategy, supervisor decide what to do. - Could handle its own crash by catching the ‘exit’ signal
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