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mesecon.queue.actions={} -- contains all ActionQueue actions
function mesecon.queue:add_function(name, func)
mesecon.queue.funcs[name] = func
end
-- If add_action with twice the same overwritecheck and same position are called, the first one is overwritten
-- use overwritecheck nil to never overwrite, but just add the event to the queue
-- priority specifies the order actions are executed within one globalstep, highest by default
-- should be between 0 and 1
function mesecon.queue:add_action(pos, func, params, time, overwritecheck, priority)
-- Create Action Table:
time = time or 0 -- time <= 0 --> execute, time > 0 --> wait time until execution
priority = priority or 1
overwritecheck = overwritecheck or {}
action = { pos=mesecon:tablecopy(pos),
func=func,
params=mesecon:tablecopy(params),
time=time,
owcheck=(overwritecheck and mesecon:tablecopy(overwritecheck)) or nil,
priority=priority}
-- if not using the queue, (MESECONS_GLOBALSTEP off), just execute the function an we're done
if not MESECONS_GLOBALSTEP then
mesecon.queue:execute(action)
return
end
local toremove = nil
-- Otherwise, add the action to the queue
if overwritecheck then -- check if old action has to be overwritten / removed:
for i, ac in ipairs(mesecon.queue.actions) do
if(mesecon:cmpPos(pos, ac.pos)
and mesecon:cmpAny(overwritecheck, ac.owcheck)) then
toremove = i
break
end
end
end
if (toremove ~= nil) then
table.remove(mesecon.queue.actions, i)
end
table.insert(mesecon.queue.actions, action)
end
-- execute the stored functions on a globalstep
-- if however, the pos of a function is not loaded (get_node_or_nil == nil), do NOT execute the function
-- this makes sure that resuming mesecons circuits when restarting minetest works fine
-- However, even that does not work in some cases, that's why we delay the time the globalsteps
-- start to be execute by 5 seconds
local get_highest_priority = function (actions)
local highestp = 0, highesti
for i, ac in ipairs(actions) do
if ac.priority > highestp then
highestp = ac.priority
highesti = i
end
end
return highesti
end
local m_time = 0
minetest.register_globalstep(function (dtime)
m_time = m_time + dtime
if (m_time < 5) then return end -- don't even try if server has not been running for 2 seconds
local actions = mesecon:tablecopy(mesecon.queue.actions)
local actions_now={}
mesecon.queue.actions = {}
-- sort actions in execute now (actions_now) and for later (mesecon.queue.actions)
for i, ac in ipairs(actions) do
if ac.time > 0 then
ac.time = ac.time - dtime -- executed later
table.insert(mesecon.queue.actions, ac)
else
table.insert(actions_now, ac)
end
end
while(#actions_now > 0) do -- execute highest priorities first, until all are executed
local hp = get_highest_priority(actions_now)
mesecon.queue:execute(actions_now[hp])
table.remove(actions_now, hp)
end
end)
function mesecon.queue:execute(action)
mesecon.queue.funcs[action.func](action.pos, unpack(action.params))
end
-- Store and read the ActionQueue to / from a file
-- so that upcoming actions are remembered when the game
-- is restarted
local wpath = minetest.get_worldpath()
local function file2table(filename)
local f = io.open(filename, "r")
if f==nil then return {} end
local t = f:read("*all")
f:close()
if t=="" or t==nil then return {} end
return minetest.deserialize(t)
end
local function table2file(filename, table)
local f = io.open(filename, "w")
f:write(minetest.serialize(table))
f:close()
end
mesecon.queue.actions = file2table(wpath.."/mesecon_actionqueue")
minetest.register_on_shutdown(function()
mesecon.queue.actions = table2file(wpath.."/mesecon_actionqueue", mesecon.queue.actions)
end)
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