PHP code example of utopia-php / balancer

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

utopia-php / balancer example snippets

topia\Balancer\Algorithm\Random;
use Utopia\Balancer\Balancer;
use Utopia\Balancer\Option;

$balancer = new Balancer(new Random());

$balancer->addFilter(fn (Option $option) => $option->getState('online', false) === true);

$balancer
    ->addOption(new Option([ 'hostname' => 'proxy-1', 'online' => true ]))
    ->addOption(new Option([ 'hostname' => 'proxy-2', 'online' => false ]))
    ->addOption(new Option([ 'hostname' => 'proxy-3', 'online' => true ]));

var_dump($balancer->run());
var_dump($balancer->run());
var_dump($balancer->run());

topia\Balancer\Algorithm\First;
use Utopia\Balancer\Algorithm\Last;
use Utopia\Balancer\Balancer;
use Utopia\Balancer\Option;

$balancer = new Balancer(new First());

$balancer
    ->addOption(new Option([ 'runtime' => 'PHP' ]))
    ->addOption(new Option([ 'runtime' => 'JavaScript' ]))
    ->addOption(new Option([ 'runtime' => 'Java' ]));

var_dump($balancer->run());

$balancer = new Balancer(new Last());

$balancer
    ->addOption(new Option([ 'runtime' => 'PHP' ]))
    ->addOption(new Option([ 'runtime' => 'JavaScript' ]))
    ->addOption(new Option([ 'runtime' => 'Java' ]));

var_dump($balancer->run());

topia\Balancer\Algorithm\RoundRobin;
use Utopia\Balancer\Balancer;
use Utopia\Balancer\Option;

$balancer = new Balancer(new RoundRobin(-1));

$balancer->addFilter(fn (Option $option) => $option->getState('online', false) === true);

$balancer
    ->addOption(new Option([ 'dataCenter' => 'fra-1' ]))
    ->addOption(new Option([ 'dataCenter' => 'fra-2' ]))
    ->addOption(new Option([ 'dataCenter' => 'lon-1' ]));

var_dump($balancer->run()); // fra-1
var_dump($balancer->run()); // fra-2
var_dump($balancer->run()); // lon-1
var_dump($balancer->run()); // fra-1
var_dump($balancer->run()); // fra-2

topia\Balancer\Algorithm\RoundRobin;
use Utopia\Balancer\Balancer;
use Utopia\Balancer\Option;

$atomic = new Atomic(-1); // Some atomic implementation, for example: https://openswoole.com/docs/modules/swoole-atomic

function onRequest() {
    $lastIndex = $atomic->get();
    $algo = new RoundRobin($lastIndex);
    $balancer = new Balancer();

    $balancer->addFilter(fn (Option $option) => $option->getState('online', false) === true);

    $balancer
        ->addOption(new Option([ 'dataCenter' => 'fra-1' ]))
        ->addOption(new Option([ 'dataCenter' => 'fra-2' ]))
        ->addOption(new Option([ 'dataCenter' => 'lon-1' ]));

    var_dump($balancer->run());

    $atomic->cmpset($lastIndex, $algo->getIndex());
}

topia\Balancer\Algorithm\First;
use Utopia\Balancer\Balancer;
use Utopia\Balancer\Group;
use Utopia\Balancer\Option;

// Prepare options where each has high CPU load
$options = [
    new Option([ 'dataCenter' => 'fra-1', 'cpu' => 91 ]),
    new Option([ 'dataCenter' => 'fra-2', 'cpu' => 95 ]),
    new Option([ 'dataCenter' => 'lon-1', 'cpu' => 87 ]),
];

// Prepare balancer that allows only low CPU load options
$balancer1 = new Balancer(new First());
$balancer1->addFilter(fn ($option) => $option->getState('cpu') < 80);

// Prepare balancer that allows all options
$balancer2 = new Balancer(new First());

// Add options to both balancers
foreach ($options as $option) {
    $balancer1->addOption($option);
    $balancer2->addOption($option);
}

// Prepare group with both balancers
$group = new Group();
$group
    ->add($balancer1)
    ->add($balancer2);

// Run group to get option
$option = $group->run() ?? new Option([]);

\var_dump($option);
// We got fra-1 option. First balancer filtered out all options, but second balancer allowed any, and First algorithm picked first option

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