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<?php
namespace PhillipsData\PrioritySchedule;
use SplQueue;
use PhillipsData\PrioritySchedule\Exceptions\NoSuchElementException;
/**
* First Available Priorirty Schedule implemented using a Queue
*/
class FirstAvailable extends SplQueue implements ScheduleInterface
{
* @var callable
protected $callbackFilter;
* Initialize the priority schedule
public function __construct()
$this->callbackFilter = function ($item) {
return (bool) $item;
};
}
* {@inheritdoc}
*
* $callback Should accept a single parameter and return a bool
* (true if valid, false otherwise)
public function setCallback(callable $callback)
$this->callbackFilter = $callback;
public function insert($item)
if (call_user_func($this->callbackFilter, $item)) {
$this->enqueue($item);
$this->rewind();
public function extract()
return $this->current();
* @throws NoSuchElementException
public function current()
if (!$this->valid()) {
throw new NoSuchElementException(
'Can not extract from empty queue.'
);
return parent::current();
phillipsdata /
priority-schedule
