From 7d9c43916b0600ac4879dfe9793eab807a83ab2b Mon Sep 17 00:00:00 2001
From: Kaarle Ritvanen <kaarle.ritvanen@datakunkku.fi>
Date: Mon, 10 Mar 2014 22:45:18 +0200
Subject: rename ACF2 to Alpine Configurator (aconf)

---
 aconf/persistence/init.lua | 113 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 aconf/persistence/init.lua

(limited to 'aconf/persistence/init.lua')

diff --git a/aconf/persistence/init.lua b/aconf/persistence/init.lua
new file mode 100644
index 0000000..991776a
--- /dev/null
+++ b/aconf/persistence/init.lua
@@ -0,0 +1,113 @@
+--[[
+Copyright (c) 2012-2014 Kaarle Ritvanen
+See LICENSE file for license details
+--]]
+
+local loadmods = require('aconf.loader')
+local topology = require('aconf.model.root').topology
+local object = require('aconf.object')
+local pth = require('aconf.path')
+
+local util = require('aconf.util')
+local contains = util.contains
+local setdefault = util.setdefault
+
+local stringy = require('stringy')
+
+
+local DataStore = object.class(
+   require('aconf.transaction.base').TransactionBackend
+)
+
+function DataStore:init()
+   object.super(self, DataStore):init()
+   self.backends = util.map(
+      function(m) return m() end,
+      loadmods('persistence/backends')
+   )
+   self.triggers = {pre={}, post={}}
+end
+
+function DataStore:trigger(phase, path, func)
+   local funcs = setdefault(self.triggers[phase], path, {})
+   if not contains(funcs, func) then table.insert(funcs, func) end
+end
+
+function DataStore:split_path(path)
+   local comps = pth.split(path)
+   local backend = self.backends[comps[1]]
+   assert(backend)
+   table.remove(comps, 1)
+   return backend, comps
+end
+
+function DataStore:get(path)
+   local backend, comps = self:split_path(path)
+   local top = topology(path)
+
+   local res = backend:get(comps, top)
+
+   if top then
+      local t = top.type
+      if t and res ~= nil then
+	 local atype = type(res)
+
+	 if t == 'table' then assert(atype == 'table')
+
+	 else
+	    assert(atype ~= 'table')
+
+	    if t == 'string' then res = tostring(res)
+	    elseif t == 'number' then res = tonumber(res)
+
+	    elseif t == 'boolean' then
+	       if atype == 'string' then res = res:lower() end
+	       if res == 1 or contains({'1', 't', 'true', 'y', 'yes'}, res) then
+		  res = true
+	       elseif res == 0 or contains(
+		  {'0', 'f', 'false', 'n', 'no'}, res
+	       ) then
+		  res = false
+	       else res = res and true or false end
+
+	    elseif contains({'binary', 'reference'}, t) then
+	       assert(atype == 'string')
+
+	    else assert(false) end
+	 end
+      end
+   end
+
+   return util.copy(res), self.mod_time[path] or 0
+end
+
+function DataStore:_set_multiple(mods)
+   local bms = {}
+   local trigger = {}
+   
+   for _, mod in ipairs(mods) do
+      local path, value = unpack(mod)
+
+      local tp = path
+      while not trigger[tp] do
+	 trigger[tp] = true
+	 tp = pth.parent(tp)
+      end
+
+      local backend, comps = self:split_path(path)
+      table.insert(setdefault(bms, backend, {}), {comps, value})
+   end
+
+   local function exec_triggers(phase)
+      for path, _ in pairs(trigger) do
+	 for _, func in ipairs(self.triggers[phase][path] or {}) do func() end
+      end
+   end
+
+   exec_triggers('pre')
+   for backend, bm in pairs(bms) do backend:set(bm) end
+   exec_triggers('post')
+end
+
+
+return DataStore()
-- 
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