mta-lua-async

Description:

MTA:SA Async library. If you have some heavy cyclic operations, that are dropping "Infinite/too long execution", or operations that "freeze" your server for couple seconds, you can use this library. It supports multiple running threads at a time.

Installation:

• Download latest version of async.lua
• Put it inside your resource folder
• Update resource meta.xml file:

...
<script src="path/to/lib/async.lua" type="shared" />
...

That's all, You are ready to go! :)

Usage

Enable debug, if you need to (it will print some useful information in server console)

Async:setDebug(true);

Iterate on interval from 1 to 50,000,000 while calculating some data on every iteration

(if you run standart "for" cycle, mta server will "freeze" for several seconds)

Async:iterate(1, 50000000, function(i)
    local x = (i + 2) * i; -- heavy opreation
    outputServerLog(x);
end);

Iterate over big array of data

Async:foreach(vehicles, function(vehicle)
    vehicle:setHealth(1000);
end);

There also an options for changing speed of your async caclulations:

Async:setPriority("low");    -- better fps
Async:setPriority("normal"); -- medium
Async:setPriority("high");   -- better perfomance

-- or, more advanced
Async:setPriority(500, 100);
-- 500ms is "sleeping" time, 
-- 100ms is "working" time, for every current async thread

Example

Load all vehicles from database, and create them in the game world (without lags)

local _connection; -- initialized database connection
local vehicles = {};

Async:setDebug(true);
Async:setPriority("low");

dbQuery(function(qh)
    local data = dbPoll(qh, 0); 
    
    Async:foreach(data, function(vehicle)
        
        local _vehicle = createVehicle( vehicle.model, vehicle.x, vehicle.y, vehicle.z );
        -- other stuff
        -- ...
        table.insert(vehicles, _vehicle);
        
    end);
    
    -- and run dummy cycle at the same time (just for fun :p)
    Async:iterate(0, 500000, function(num)
        outputServerLog(num);
    end);
    
end, _connection, "SELECT * FROM vehicles");

Upgrading

If you've used library before "Singleton" update:

-- warning! old example
local async = Async();
async:iterate(function(i)
	outputDebugString(i);
end);

You can easily simulate it, just by adding "_" before Async class name:

-- warning! updated old example (localized scope, not recommended)
local async = _Async();
async:iterate(function(i)
	outputDebugString(i);
end);

But, still: it's not recommended! :P

Under the hood:

If you want to create independent/scope-isolated instance of Async manager, you can do it that way:

local isolatedAsync = _Async();

You can find kinda well documented code inside async.lua file. If you need some help, you can always create an issue.

Other

Library uses bartbes/slither class library. Check it out. @Bartbes, thank you so much! :)