forked from minetest-mods/mesecons
Refactor actionqueue.lua (#501)
Reduce actionqueue complexity, thus faster execution Improve code style Add documentation/explanations
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SmallJoker
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@ -1,96 +1,140 @@
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mesecon.queue.actions={} -- contains all ActionQueue actions
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--[[
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Mesecons uses something it calls an ActionQueue.
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function mesecon.queue:add_function(name, func)
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mesecon.queue.funcs[name] = func
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The ActionQueue holds functions and actions.
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Functions are added on load time with a specified name.
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Actions are preserved over server restarts.
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Each action consists of a position, the name of an added function to be called,
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the params that should be used in this function call (additionally to the pos),
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the time after which it should be executed, an optional overwritecheck and a
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priority.
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If time = 0, the action will be executed in the next globalstep, otherwise the
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earliest globalstep when it will be executed is the after next globalstep.
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It is guaranteed, that for two actions ac1, ac2 where ac1 ~= ac2,
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ac1.time == ac2.time, ac1.priority == ac2.priority and ac1 was added earlier
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than ac2, ac1 will be executed before ac2 (but in the same globalstep).
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Note: Do not pass references in params, as they can not be preserved.
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Also note: Some of the guarantees here might be dropped at some time.
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]]
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-- localize for speed
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local queue = mesecon.queue
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queue.actions = {} -- contains all ActionQueue actions
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function queue:add_function(name, func)
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queue.funcs[name] = func
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end
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-- If add_action with twice the same overwritecheck and same position are called, the first one is overwritten
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-- use overwritecheck nil to never overwrite, but just add the event to the queue
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-- priority specifies the order actions are executed within one globalstep, highest first
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-- should be between 0 and 1
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function mesecon.queue:add_action(pos, func, params, time, overwritecheck, priority)
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function queue:add_action(pos, func, params, time, overwritecheck, priority)
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-- Create Action Table:
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time = time or 0 -- time <= 0 --> execute, time > 0 --> wait time until execution
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priority = priority or 1
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local action = { pos=mesecon.tablecopy(pos),
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local action = {
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pos = mesecon.tablecopy(pos),
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func = func,
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params = mesecon.tablecopy(params or {}),
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time = time,
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owcheck = (overwritecheck and mesecon.tablecopy(overwritecheck)) or nil,
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priority=priority}
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priority = priority
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}
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local toremove = nil
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-- Otherwise, add the action to the queue
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if overwritecheck then -- check if old action has to be overwritten / removed:
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for i, ac in ipairs(mesecon.queue.actions) do
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if(vector.equals(pos, ac.pos)
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and mesecon.cmpAny(overwritecheck, ac.owcheck)) then
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toremove = i
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-- check if old action has to be overwritten / removed:
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if overwritecheck then
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for i, ac in ipairs(queue.actions) do
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if vector.equals(pos, ac.pos)
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and mesecon.cmpAny(overwritecheck, ac.owcheck) then
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-- remove the old action
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table.remove(queue.actions, i)
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break
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end
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end
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end
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if (toremove ~= nil) then
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table.remove(mesecon.queue.actions, toremove)
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end
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table.insert(mesecon.queue.actions, action)
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table.insert(queue.actions, action)
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end
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-- execute the stored functions on a globalstep
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-- if however, the pos of a function is not loaded (get_node_or_nil == nil), do NOT execute the function
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-- this makes sure that resuming mesecons circuits when restarting minetest works fine
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-- this makes sure that resuming mesecons circuits when restarting minetest works fine (hm, where do we do this?)
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-- However, even that does not work in some cases, that's why we delay the time the globalsteps
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-- start to be execute by 5 seconds
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local get_highest_priority = function (actions)
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local highestp = -1
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local highesti
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for i, ac in ipairs(actions) do
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if ac.priority > highestp then
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highestp = ac.priority
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highesti = i
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end
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end
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-- start to be execute by 4 seconds
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return highesti
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end
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local m_time = 0
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local resumetime = mesecon.setting("resumetime", 4)
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minetest.register_globalstep(function (dtime)
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m_time = m_time + dtime
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-- don't even try if server has not been running for XY seconds; resumetime = time to wait
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-- after starting the server before processing the ActionQueue, don't set this too low
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if (m_time < resumetime) then return end
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local actions = mesecon.tablecopy(mesecon.queue.actions)
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local function globalstep_func(dtime)
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local actions = queue.actions
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-- split into two categories:
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-- actions_now: actions to execute now
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-- queue.actions: actions to execute later
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local actions_now = {}
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queue.actions = {}
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mesecon.queue.actions = {}
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-- sort actions into two categories:
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-- those toexecute now (actions_now) and those to execute later (mesecon.queue.actions)
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for i, ac in ipairs(actions) do
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for _, ac in ipairs(actions) do
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if ac.time > 0 then
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ac.time = ac.time - dtime -- executed later
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table.insert(mesecon.queue.actions, ac)
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-- action ac is to be executed later
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-- ~> insert into queue.actions
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ac.time = ac.time - dtime
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table.insert(queue.actions, ac)
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else
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-- action ac is to be executed now
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-- ~> insert into actions_now
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table.insert(actions_now, ac)
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end
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end
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while(#actions_now > 0) do -- execute highest priorities first, until all are executed
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local hp = get_highest_priority(actions_now)
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mesecon.queue:execute(actions_now[hp])
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table.remove(actions_now, hp)
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-- stable-sort the executed actions after their priority
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-- some constructions might depend on the execution order, hence we first
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-- execute the actions that had a lower index in actions_now
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local old_action_order = {}
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for i, ac in ipairs(actions_now) do
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old_action_order[ac] = i
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end
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table.sort(actions_now, function(ac1, ac2)
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if ac1.priority ~= ac2.priority then
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return ac1.priority > ac2.priority
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else
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return old_action_order[ac1] < old_action_order[ac2]
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end
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end)
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function mesecon.queue:execute(action)
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-- execute highest priorities first, until all are executed
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for _, ac in ipairs(actions_now) do
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queue:execute(ac)
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end
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end
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-- delay the time the globalsteps start to be execute by 4 seconds
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do
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local m_time = 0
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local resumetime = mesecon.setting("resumetime", 4)
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local globalstep_func_index = #minetest.registered_globalsteps + 1
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minetest.register_globalstep(function(dtime)
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m_time = m_time + dtime
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-- don't even try if server has not been running for XY seconds; resumetime = time to wait
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-- after starting the server before processing the ActionQueue, don't set this too low
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if m_time < resumetime then
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return
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end
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-- replace this globalstep function
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minetest.registered_globalsteps[globalstep_func_index] = globalstep_func
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end)
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end
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function queue:execute(action)
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-- ignore if action queue function name doesn't exist,
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-- (e.g. in case the action queue savegame was written by an old mesecons version)
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if mesecon.queue.funcs[action.func] then
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mesecon.queue.funcs[action.func](action.pos, unpack(action.params))
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if queue.funcs[action.func] then
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queue.funcs[action.func](action.pos, unpack(action.params))
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end
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end
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@ -98,8 +142,8 @@ end
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-- Store and read the ActionQueue to / from a file
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-- so that upcoming actions are remembered when the game
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-- is restarted
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mesecon.queue.actions = mesecon.file2table("mesecon_actionqueue")
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queue.actions = mesecon.file2table("mesecon_actionqueue")
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minetest.register_on_shutdown(function()
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mesecon.table2file("mesecon_actionqueue", mesecon.queue.actions)
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mesecon.table2file("mesecon_actionqueue", queue.actions)
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end)
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