[Guide + Script] Load Balancing Headless Clients

[blckeagls 12]

Hello All, 

 

Was working on this for a while and figured it would be beneficial for others.

 

My use: offloading database queries and load balancing across multiple headless clients.  Also allow the server to process database queries when headless clients are not online

 

The idea is to use the Server as a communications broker between clients and headless clients.

 

Script: Performs publicVariableClient to an available headless client..  If one is not available, sends the it to the server. (Script has to be ran from the server, owner command only works on the server)

SendToHeadlessClient = {

private ["_var","_owner"];

// The variable to be passed

_var = _this; 

 

 

//Initializing owner variable

_owner = []; 

 

//Checks if there are any headless clients

if (count (entities "HeadlessClient_F") == 0) then { 

 

// If no headless clients send to server

publicVariableServer _var; 

 

} else {

 

// Gets a list of headless client ClientIDs

{

//Is an active headless client

if (_x in allPlayers) then { 

 

//Creates array of clientIDs

_owner = _owner + [owner _x];  

 

};

} forEach (entities "HeadlessClient_F"); 

 

//If active headless clients are online send to headlessclient, else send to server

if (count _owner > 0) then { 

 

//Choose a headless client at random and sends

(_owner call BIS_fnc_selectRandom) publicVariableClient _var; 

 

} else {

 

//Send to server

publicVariableServer _var; 

 

};

};

};

 

Example:

 

Server Code:

"PlayerSendToServer_AddBuilding" addPublicVariableEventHandler {

//Recieves Request from Player

SendToDatabase_AddBuilding = _this select 1;

 

//Calls function to send to a headless client if available, else send back to server

"SendToDatabase_AddBuilding" call SendToHeadlessClient;

};

 

"SendToDatabase_AddBuilding" addPublicVariableEventHandler { 

//Processes Request from Player

(_this select 1) call BuildingObjectInsertIntoDatabase;

};

 

HeadlessClient(s) Code:

"SendToDatabase_AddBuilding" addPublicVariableEventHandler { 

//Processes Request from Player

(_this select 1) call BuildingObjectInsertIntoDatabase;

};

 

Client Code:

_object = "I_Truck_02_medical_F" createVehicle [16699.800781,13586.956055,15.927668];

_object setPosWorld [16699.800781,13586.956055,15.927668];

_direction = random 360;

_object setDir _direction;

 

//Sends request to server to be processed

PlayerSendToServer_AddBuilding = [_object,player];

publicVariableServer "PlayerSendToServer_AddBuilding";