Created
December 11, 2020 00:22
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GenServer implementation in Ruby
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| class Stack | |
| def self.start_link(state) | |
| GenServer.start_link(new(state)) | |
| end | |
| def self.push(ractor, value) | |
| GenServer.cast(ractor, [:push, value]) | |
| end | |
| def self.pop(ractor) | |
| GenServer.call(ractor, :pop) | |
| end | |
| def initialize(state) | |
| @state = state | |
| end | |
| def handle_cast(msg) | |
| case msg | |
| in [:push, value] | |
| push(value) | |
| [:noreply, self] | |
| end | |
| end | |
| def handle_call(msg, _from) | |
| case msg | |
| when :pop | |
| [:reply, pop(), self] | |
| end | |
| end | |
| def push(value) | |
| state.unshift(value) | |
| end | |
| def pop | |
| state.shift | |
| end | |
| private | |
| attr_reader :state | |
| end | |
| module GenServer | |
| def self.start_link(state) | |
| r = Ractor.new(state) do |state| | |
| GenServer.receive(state) | |
| end | |
| [:ok, r] | |
| end | |
| def self.cast(ractor, msg) | |
| ractor.send(['$gen_cast', msg]) | |
| end | |
| def self.call(ractor, msg) | |
| ractor.send(['$gen_call', Ractor.current, msg]) | |
| case Ractor.receive | |
| in [:ok, res] | |
| res | |
| end | |
| end | |
| def self.receive(state) | |
| case Ractor.receive | |
| in ['$gen_cast', msg] | |
| case state.handle_cast(msg) | |
| in [:noreply, state] | |
| GenServer.receive(state) | |
| end | |
| in ['$gen_call', from, msg] | |
| case state.handle_call(msg, from) | |
| in [:reply, reply, state] | |
| from.send([:ok, reply]) | |
| GenServer.receive(state) | |
| end | |
| end | |
| end | |
| end | |
| Stack.start_link([:hello]) => [:ok, ractor] # In line pattern matching | |
| Stack.pop(ractor) # => :hello | |
| Stack.push(ractor, :world) | |
| Stack.pop(ractor) # => :world |
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