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Added more tests and updated the presentation
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This commit is contained in:
Andre Henriques
2024-01-08 18:42:29 +00:00
parent 330b49a7ca
commit 182faf18d6
4 changed files with 230 additions and 11 deletions
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39
lib/paxos.ex
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@@ -1,3 +1,12 @@
#
#
# Possible actions
# :kill_before_decision
# :increase_ballot_number - this makes it so that it does not propose but jump simply increases the number of the current ballot
# this is usefull when forcing a nack
#
defmodule Paxos do
def start(name, processes) do
IO.puts("Starting paxos for #{name}")
@@ -73,6 +82,16 @@ defmodule Paxos do
send(pid_to_inform, {:decision, inst, state.decided[inst]})
state
action == :increase_ballot_number ->
state = has_or_create(state, inst)
IO.puts("#{state.name} - Got request to increase ballot number for inst #{inst}")
# Inform the pid with timeout right way
send(pid_to_inform, {:timeout, inst});
set_instmap(state, inst, fn map -> %{map| ballot: map.ballot + 1} end)
not Map.has_key?(state.instmap, inst) ->
EagerReliableBroadcast.broadcast(state.name, {:other_propose, inst, value})
state = has_or_create(state, inst, value, pid_to_inform, action)
@@ -94,6 +113,7 @@ defmodule Paxos do
)
true ->
EagerReliableBroadcast.broadcast(state.name, {:other_propose, inst, value})
prepare(state, inst)
end
@@ -101,7 +121,7 @@ defmodule Paxos do
state = %{state | other_values: Map.put(state.other_values, inst, value)}
cond do
Map.has_key?(state.decided, inst) ->
has_finished(state, inst) ->
EagerReliableBroadcast.broadcast(
state.name,
{:decide, inst, state.decided[inst]}
@@ -170,7 +190,7 @@ defmodule Paxos do
send(state.instmap[inst].pid_to_inform, {:abort, inst})
end
EagerReliableBroadcast.broadcast(state.name, {:abort, inst, ballot, new_ballot})
EagerReliableBroadcast.broadcast(state.name, {:abort, inst, ballot})
set_instmap(state, inst, fn map -> %{
map | has_sent_accept: false,
@@ -187,16 +207,15 @@ defmodule Paxos do
has_finished(state, inst) ->
state
state.instmap[inst].ballot == ballot ->
true ->
IO.puts("#{state.name} - got information to send abort")
if Map.has_key?(state.instmap, inst) and state.instmap[inst].pid_to_inform != nil do
send(state.instmap[inst].pid_to_inform, {:abort, inst})
end
state
true ->
state
end
{:prepared, inst, ballot, accepted_ballot, accepted_value} ->
@@ -218,7 +237,7 @@ defmodule Paxos do
prepared(state, inst)
ballot > state.instmap[inst].ballot ->
IO.puts("Probably recieved this before preare came to self sending with delay")
IO.puts("#{state.name} - Probably recieved this before preare came to self sending with delay")
Process.send_after(self(), {:prepared, inst, ballot, accepted_ballot, accepted_value}, 100)
state
@@ -253,7 +272,7 @@ defmodule Paxos do
end
{:accepted, inst, ballot} ->
IO.puts("#{state.name} accepted #{inspect(inst)} #{inspect(ballot)}")
IO.puts("#{state.name} - accepted #{inspect(inst)} #{inspect(ballot)}")
cond do
has_finished(state, inst) ->
@@ -289,7 +308,7 @@ defmodule Paxos do
state
{:rb_deliver, _, {:decide, inst, value}} ->
IO.puts("#{state.name} decided #{inspect(inst)} #{inspect(value)}")
IO.puts("#{state.name} - decided #{inspect(inst)} #{inspect(value)}")
if has_finished(state, inst) do
state
@@ -333,7 +352,7 @@ defmodule Paxos do
true ->
ballot = state.instmap[inst].ballot + 1
IO.puts("#{state.name} sending all prepare #{inst} #{ballot}")
IO.puts("#{state.name} - sending all prepare #{inst} #{ballot}")
EagerReliableBroadcast.broadcast(state.name, {:prepare, state.name, inst, ballot})
set_instmap(state, inst, fn map -> %{