Phive\Queue\Tests\Queue\Concurrency::testConcurrency PHP Method

    public function testConcurrency()
    {
        if (!class_exists('GearmanClient', false)) {
            $this->markTestSkipped('pecl/gearman is required for this test to run.');
        }
        $client = new \GearmanClient();
        $client->addServer();
        $workerIds = [];
        $poppedItems = [];
        $client->setCompleteCallback(function (\GearmanTask $task) use(&$workerIds, &$poppedItems) {
            $data = explode(':', $task->data(), 2);
            if (!is_array($data) || 2 !== count($data)) {
                return;
            }
            list($workerId, $item) = $data;
            $workerIds[$workerId] = true;
            if (!isset($poppedItems[$item])) {
                $poppedItems[$item] = true;
            }
        });
        $queueSize = $this->getConcurrencyQueueSize();
        $this->assertGreaterThan(10, $queueSize, 'Queue size is too small to test concurrency.');
        $workload = serialize(self::getHandler());
        for ($i = 1; $i <= $queueSize; $i++) {
            $this->queue->push($i);
            $client->addTask('pop', $workload);
        }
        try {
            // run the tasks in parallel (assuming multiple workers)
            $result = $client->runTasks();
        } catch (\GearmanException $e) {
            $result = false;
        }
        if (!$result) {
            $this->markTestSkipped('Unable to run gearman tasks. Check if gearman server is running.');
        }
        $this->assertEquals($queueSize, count($poppedItems));
        $this->assertGreaterThan(1, count($workerIds), 'Not enough workers to test concurrency.');
    }