Boilerplate.

acceptor.rb

@@ -0,0 +1,2 @@
+class Acceptor
+end

learner.rb

@@ -0,0 +1,2 @@
+class Learner
+end

paxos_replica.rb

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+class PaxosReplica
+  def initialize
+    @proposer, @acceptor, @learner = Proposer.new, Acceptor.new, Learner.new
+  end
+end

proposer.rb

@@ -0,0 +1,2 @@
+class Proposer
+end

rpc_exporter.rb

@@ -0,0 +1,13 @@
+class RPCExporter
+  attr_reader :paxos_replica
+
+  def initialize
+    @paxos_replica = PaxosReplica.new
+  end
+
+  def propose
+  end
+
+  def learn
+  end
+end

supervisor.rb

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+require 'set'
+
+class Supervisor
+  attr_reader :replicas
+
+  def initialize
+    @replicas = Set.new
+  end
+
+  def add_replica(replica)
+    @replicas.add(replica)
+  end
+
+  def remove_replica(replica)
+    @replicas.remove(replica)
+  end
+end