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<?php declare(strict_types=1);
/**
* @copyright Copyright (c) 2019 Robin Appelman <robin@icewind.nl>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OCA\DocumentServer\IPC;
use OCA\DocumentServer\Channel\Channel;
use OCP\IMemcache;
/**
* IPC Channels built on top of memcache concurrency primitives
*/
class MemcacheIPCBackend implements IIPCBackend {
private $memcache;
public function __construct(IMemcache $memcache) {
$this->memcache = $memcache;
}
public function initChannel(string $channel) {
$this->memcache->add("$channel::write_key", 0);
$this->memcache->add("$channel::read_key", 0);
}
public function cleanupChannel(string $channel) {
$this->memcache->remove("$channel::write_key");
$this->memcache->remove("$channel::read_key");
}
public function pushMessage(string $channel, string $message) {
$key = $this->memcache->inc("$channel::write_key");
$this->memcache->set("$channel::message_$key", $message, Channel::TIMEOUT * 4);
}
public function popMessage(string $channel, int $timeout): ?string {
$writeKey = $this->memcache->get("$channel::write_key");
$readKey = $this->memcache->inc("$channel::read_key");
if ($writeKey >= $readKey) {
$message = $this->memcache->get("$channel::message_$readKey");
$this->memcache->remove("$channel::message_$readKey");
return $message;
} else {
// no unread message, return read pointer
$this->memcache->dec("$channel::read_key");
return null;
}
}
}
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