Elixir – Peeking into Elixir's Processes, OTP and Supervisors
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Elixir – Peeking into Elixir's Processes, OTP and Supervisors
- 1. ElixirPeeking into Elixir’s Processes, OTP & Supervisors 21st March 2014 /benjamintanweihao /bentanweihao benjamintanweihao@gmail.com
- 2. What will we learn today? Elixir & Erlang In less than 5 minutes
- 3. Elixir & Erlang In less than 5 minutes Processes 101 The Basic Concurrency Primitive What will we learn today?
- 4. Elixir & Erlang In less than 5 minutes OTP Framework and much more Processes 101 The Basic Concurrency Primitive What will we learn today?
- 5. Elixir & Erlang In less than 5 minutes OTP Framework and much more Supervisors Fault Tolerance & Recovery Processes 101 The Basic Concurrency Primitive What will we learn today?
- 7. Elixir & ErlangIn less than 5 minutes
- 8. Ohai, Erlang! Erlang is a general-purpose concurrent, garbage-collected programming language and runtime system. The sequential subset of Erlang is a functional language, with eager evaluation, single assignment, and dynamic typing. It was designed by Ericsson to support distributed, fault-tolerant, soft-real-time, non- stop applications. It supports hot swapping, so that code can be changed without stopping a system.
- 9. Ohai, Erlang! Erlang is a general-purpose concurrent, garbage-collected programming language and runtime system. The sequential subset of Erlang is a functional language, with eager evaluation, single assignment, and dynamic typing. It was designed by Ericsson to support distributed, fault-tolerant, soft-real-time, non- stop applications. It supports hot swapping, so that code can be changed without stopping a system.
- 10. • Free lunch is over Why Elixir ?
- 11. Why Elixir ? • Free lunch is over • Hyper-threading & Multicore • Faster software means using all cores! • But … Concurrency -> Coordination • Functional makes this easier
- 12. Design Goals of Elixir 1.Productivity 2.Extensibility 3.Compatibility
- 16. Extensibility Macros & Meta-programming Implementing unless using if
- 17. Extensibility Macros & Meta-programming Implementing unless using if
- 18. Compatibility Elixir can call Erlang code, without any conversion cost at all.
- 19. Compatibility Elixir can use Erlang libraries!
- 20. The Actor Concurrency Model • Actor = Process
- 21. The Actor Concurrency Model • Actor = Process • A process performs a specific task when it receives a message
- 22. The Actor Concurrency Model • Actor = Process • A process performs a specific task when it receives a message • In turn, the process can reply to the sender
- 23. The Actor Concurrency Model • Actor = Process • A process performs a specific task when it receives a message • In turn, the process can reply to the sender • All messages go to a processes’ mailbox – Q of unprocessed messages sent from other processes that are not yet consumed
- 24. The Actor Concurrency Model • Actor = Process • A process performs a specific task when it receives a message • In turn, the process can reply to the sender • All messages go to a processes’ mailbox – Q of unprocessed messages sent from other processes that are not yet consumed Shared-nothing Async Message-passing
- 25. Processes 101The Basic Concurrency Primitive
- 26. Creating Processes & Sending Messages in Elixir Creating a Process
- 27. Creating Processes & Sending Messages in Elixir Module, Function, Arguments
- 28. Creating Processes & Sending Messages in Elixir Process id
- 29. Creating Processes & Sending Messages in Elixir Sending a Message to w1
- 30. Creating Processes & Sending Messages in Elixir Process waits for a message …
- 31. Creating Processes & Sending Messages in Elixir Pattern matches!
- 32. Creating Processes & Sending Messages in Elixir Result is sent back to the calling process (self)
- 33. Creating Processes & Sending Messages in Elixir Returns immediately
- 34. Creating Processes & Sending Messages in Elixir Get result from self
- 35. Creating Processes & Sending Messages in Elixir Demo
- 36. OTPFramework and much more
- 37. What is OTP? • Comes with Elixir/Erlang • Framework to build applications that are fault- tolerant, scalable, distributed • Databases + Profilers + Debuggers
- 38. OTP Behaviours • GenServer • Supervisor • Application
- 39. An Example GenServer Implement the GenServer Behaviour
- 40. An Example GenServer Implement GenServer Callbacks
- 41. An Example GenServer Callbacks are NOT called explicitly
- 42. An Example GenServer OTP calls the callbacks.
- 43. An Example GenServer Synchronous Call: Caller waits for reply
- 44. An Example GenServer Asynchronous Call: Caller doesn’t wait for reply
- 45. An Example GenServer Demo
- 46. SupervisorsFault Tolerance & Recovery
- 47. Supervisors for Fault Tolerance and Recovery one_for_one restart strategy
- 48. Supervisors for Fault Tolerance and Recovery rest_for_all restart strategy
- 49. Supervisors for Fault Tolerance and Recovery rest_for_one restart strategy
- 50. An Example Supervisor Implement the Supervisor Behaviour
- 51. An Example Supervisor Declaring the Supervision tree. Both Supervisors and Workers (e.g. GenServers) can be supervised.
- 53. An Example Supervisor Declare the restart strategy
- 54. Supervisor Demo Supervisor A Supervisor B Supervisor C Supervisor D Server D Server B Worker 1Worker 1Worker
- 55. Supervisor Demo Supervisor A Supervisor B Supervisor C Supervisor D Server D Server B Worker 1Worker 1Worker one_for_one
- 56. Supervisor Demo Supervisor A Supervisor B Supervisor C Supervisor D Server D Server B Worker 1Worker 1Worker one_for_all
- 57. Supervisor Demo Supervisor A Supervisor B Supervisor C Supervisor D Server D Server B Worker 1Worker 1Worker simple_one_for_one
- 58. Supervisor Demo Supervisor A Supervisor B Supervisor C Supervisor D Server D Server B Worker 1Worker 1Worker one_for_one
- 59. Supervisor Demo Supervisor A Supervisor B Supervisor C Supervisor D Server D Server B Worker 1Worker 1Worker one_for_one simple_one_for_one one_for_all one_for_one
- 60. Elixir & Erlang In less than 5 minutes OTP Framework and much more Supervisors Fault Tolerance & Recovery Processes 101 The Basic Concurrency Primitive
- 61. Resources
- 62. Work in Progress! ! Sign up at: http://www.exotpbook.com Me.