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defmodule Worker do | |
use GenServer | |
def start_link(_) do | |
GenServer.start_link(__MODULE__, %{}, []) | |
end | |
def get_history(self) do | |
GenServer.call(self, :get_history) | |
end | |
@log_replication_topic "EVENT_NOTIFICATION_QUEUE" | |
defmodule State do | |
defstruct name: nil, clock: 0, eventLog: [] | |
end | |
defmodule LogEntry do | |
defstruct origin: nil, time: 0, event: nil | |
end | |
# ---------------------------------------------------------------------------- | |
def init(_) do | |
PubSub.subscribe(@log_replication_topic, self()) | |
PubSub.broadcast(Dispatcher.get_monitoring_topic, {:new_child, self()}) | |
{:ok, %State{ name: self(), clock: 1, eventLog: [] }} | |
end | |
def handle_call({:add, event}, _from, worker) do | |
logEntry = %LogEntry{ | |
origin: worker.name, | |
time: worker.clock, | |
event: event | |
} | |
newWorkerState = %{ worker | | |
clock: worker.clock + 1, | |
eventLog: [logEntry | worker.eventLog] | |
} | |
PubSub.broadcast(@log_replication_topic, {:replication_log, logEntry}) | |
{:reply, :ok, newWorkerState} | |
end | |
def handle_call(:get_history, _from, worker) do | |
sortedLog = Enum.sort_by(worker.eventLog, fn event -> {event.time, event.origin} end) | |
newState = %{ worker | eventLog: sortedLog } | |
{:reply, sortedLog, newState} | |
end | |
def handle_info({:replication_log, logEntry}, worker) do | |
newWorkerState = | |
if logEntry.origin == worker.name do | |
worker | |
else | |
%{ worker | | |
clock: max(worker.clock, logEntry.time) + 1, | |
eventLog: [logEntry | worker.eventLog] } | |
end | |
{:noreply, newWorkerState } | |
end | |
end |
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