LBFactorySimple.php

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<?php
class LBFactorySimple extends LBFactory {
    private $mainLB;
    private $extLBs = [];

    private $servers = [];
    private $externalClusters = [];

    private $loadMonitorClass;

    public function __construct( array $conf ) {
        parent::__construct( $conf );

        $this->servers = isset( $conf['servers'] ) ? $conf['servers'] : [];
        foreach ( $this->servers as $i => $server ) {
            if ( $i == 0 ) {
                $this->servers[$i]['master'] = true;
            } else {
                $this->servers[$i]['replica'] = true;
            }
        }

        $this->externalClusters = isset( $conf['externalClusters'] )
            ? $conf['externalClusters']
            : [];
        $this->loadMonitorClass = isset( $conf['loadMonitorClass'] )
            ? $conf['loadMonitorClass']
            : 'LoadMonitor';
    }

    public function newMainLB( $domain = false ) {
        return $this->newLoadBalancer( $this->servers );
    }

    public function getMainLB( $domain = false ) {
        if ( !isset( $this->mainLB ) ) {
            $this->mainLB = $this->newMainLB( $domain );
            $this->getChronologyProtector()->initLB( $this->mainLB );
        }

        return $this->mainLB;
    }

    public function newExternalLB( $cluster ) {
        if ( !isset( $this->externalClusters[$cluster] ) ) {
            throw new InvalidArgumentException( __METHOD__ . ": Unknown cluster \"$cluster\"." );
        }

        return $this->newLoadBalancer( $this->externalClusters[$cluster] );
    }

    public function getExternalLB( $cluster ) {
        if ( !isset( $this->extLBs[$cluster] ) ) {
            $this->extLBs[$cluster] = $this->newExternalLB( $cluster );
            $this->getChronologyProtector()->initLB( $this->extLBs[$cluster] );
        }

        return $this->extLBs[$cluster];
    }

    private function newLoadBalancer( array $servers ) {
        $lb = new LoadBalancer( array_merge(
            $this->baseLoadBalancerParams(),
            [
                'servers' => $servers,
                'loadMonitor' => [ 'class' => $this->loadMonitorClass ],
            ]
        ) );
        $this->initLoadBalancer( $lb );

        return $lb;
    }

    public function forEachLB( $callback, array $params = [] ) {
        if ( isset( $this->mainLB ) ) {
            call_user_func_array( $callback, array_merge( [ $this->mainLB ], $params ) );
        }
        foreach ( $this->extLBs as $lb ) {
            call_user_func_array( $callback, array_merge( [ $lb ], $params ) );
        }
    }
}