61 lines
1.3 KiB
Ruby
61 lines
1.3 KiB
Ruby
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module Mutant
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# A minimal actor implementation
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module Actor
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# Error raised when actor signalling protocol is violated
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class ProtocolError < RuntimeError
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end # ProtocolError
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# Undefined message payload
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Undefined = Class.new do
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INSPECT = 'Mutant::Actor::Undefined'.freeze
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# Return object inspection
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#
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# @return [String]
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#
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# @api private
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#
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def inspect
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INSPECT
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end
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end.new
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# Message being exchanged between actors
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class Message
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include Concord::Public.new(:type, :payload)
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# Return new message
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#
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# @param [Symbol] type
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# @param [Object] payload
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#
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# @return [Message]
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#
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def self.new(_type, _payload = Undefined)
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super
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end
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end # Message
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# Bindin to others actors sender for simple RPC
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class Binding
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include Concord.new(:actor, :other)
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# Send message and wait for reply
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#
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# @param [Symbol] type
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#
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# @return [Object]
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#
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def call(type)
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other.call(Message.new(type, actor.sender))
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message = actor.receiver.call
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fail ProtocolError, "Expected #{type} but got #{message.type}" unless type.equal?(message.type)
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message.payload
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end
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end # Binding
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end # Actor
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end # Mutant
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