Gleam OTP – Fault Tolerant Multicore Programs with Actors

Summary

Gleam OTP Fault tolerant multi-core programs with OTP, the BEAM actor framework. gleam add gleam_otp@1 import gleam/erlang/process . { type Subject } import gleam/otp/actor pub fn main ( ) { // Start an actor let assert Ok ( actor ) = actor . new ( 0 ) |> actor . on_message ( handle_message ) |> actor . start // Send some messages to the actor actor . send ( actor . data , Add ( 5 ) ) actor . send ( actor . data , Add ( 3 ) ) // Send a message and get a reply assert actor . call ( actor . data , waiting : 10 , sending : Get ) == 8 } pub fn handle_message ( state : Int , message : Message ) -> actor . Next ( Int , Message ) { case message { Add ( i ) -> { let state = state + i actor . continue ( state ) } Get ( reply ) -> { actor . send ( reply , state ) actor . continue ( state ) } } } pub type Message { Add ( Int ) Get ( Subject ( Int ) ) } Gleam’s actor system is built with a few primary goals: Full type safety of actors and messages. Be compatible with Erlang’s OTP actor framework. Provide fault tolerance and self-healing through supervisors. Have equivalent performance to Erlang’s OTP. This library documents its abstractions and functionality, but you may also wish to read the documentation or other material on Erlang’s OTP framework to get a fuller understanding of OTP, the problems it solves, and the motivations for its design. Not all Erlang/OTP functionality is included in this library. Some is not possible to represent in a type safe way, so it is not included. Other features are still in development, such as further process supervision strategies. Common types of actor This library provides several different types of actor that can be used in Gleam programs. Process The process is the lowest level building block of OTP, all other actors are built on top of processes either directly or indirectly. Typically this abstraction would not be used very often in Gleam applications, favour other actor types that provide more functionality. Gleam's process module is...