sample

Client.php

<?php
namespace Foo\Queue\Contract;

interface Client
{
    public static function get_instance();
    public function message($mesage);
}

LocalClient.php

<?php
namespace Foo\Queue;

use Foo\Queue\Contract\Client;

class LocalClient implements Client
{
    public static function get_instance()
    {
        return new static();
    }
    
    public function message($message)
    {
        //nothing to do on local
        return false;
    }
}

Manager.php

<?php
namespace Foo\Queue;

use Foo\Aws\Sqs\Client as AwsClient;

class Manager
{

    /**
     * @return \Geenie\Queue\Contract\Client
     */
    public static function get_client()
    {
        $is_aws_active = true;
        if ($is_aws_active) {
            return AwsClient::get_instance();
        } else {
            return LocalClient::get_instance();
        }
    }
}

SqsClient.php

<?php
namespace Foo\Aws\Sqs;

use Foo\Queue\Contract\Client as ClientInterface;

class SqsClient implements ClientInterface
{

    public static function get_instance()
    {
        return new static();
    }
    
    public function message($message)
    {
        $this->client->sendMessage($message);
        return true;
    }

}