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<?php namespace Smush\Core\Background; use Smush\Core\Threads\JSON_Object_Array; use Smush\Core\Threads\JSON_Record; class Background_Queue { /** * @var JSON_Object_Array / private $object_array; /* * @var JSON_Record / private $meta; private $key; public function __construct( $key ) { $this->key = $key; $this->object_array = new JSON_Object_Array( $key, false ); $this->meta = new JSON_Record( $key . '_queue_meta', false ); } public function is_empty() { return empty( $this->object_array->get() ); } /* * @param \JsonSerializable[] $tasks * * @return bool */ public function populate( $tasks ) { if ( empty( $tasks ) \|\| ! is_array( $tasks ) ) { return false; } $this->meta->init(); $this->meta->set_values( array( 'current' => - 1, 'total' => count( $tasks ) ) ); $this->object_array->init(); return $this->object_array->unsafe_set( $tasks ); } public function get_next_task() { $new_pointer = $this->meta->increment_and_get( 'current' ); if ( $new_pointer === false ) { // Queue row was deleted return false; } $item = $this->object_array->get_item( $new_pointer ); return empty( $item ) ? null : $item; } public function get_remaining_count() { $meta = $this->meta->get(); $total = isset( $meta['total'] ) ? (int) $meta['total'] : 0; $current = isset( $meta['current'] ) ? (int) $meta['current'] : - 1; return max( 0, $total - ( $current + 1 ) ); } public function cleanup() { $this->meta->delete(); $this->object_array->delete(); } }

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