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<?php
/**
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Cache
* @author 2015 Timo Tijhof
*/
/**
* Generic base class for storage interfaces.
*
* Provides convenient TTL constants.
*
* @ingroup Cache
* @since 1.27
*/
interface IExpiringStore {
// Constants for TTL values, in seconds
const TTL_SECOND = 1;
const TTL_MINUTE = 60;
const TTL_HOUR = 3600;
const TTL_DAY = 86400; // 24 * 3600
const TTL_WEEK = 604800; // 7 * 24 * 3600
const TTL_MONTH = 2592000; // 30 * 24 * 3600
const TTL_YEAR = 31536000; // 365 * 24 * 3600
// Shorthand process cache TTLs (useful for web requests and CLI mode)
const TTL_PROC_SHORT = 3; // reasonably strict cache time that last the life of quick requests
const TTL_PROC_LONG = 30; // loose cache time that can survive slow web requests
const TTL_INDEFINITE = 0;
// Attribute and QoS constants; higher QOS values with the same prefix rank higher...
// Medium attributes constants related to emulation or media type
const ATTR_EMULATION = 1;
const QOS_EMULATION_SQL = 1;
// Medium attributes constants related to replica consistency
const ATTR_SYNCWRITES = 2; // SYNC_WRITES flag support
const QOS_SYNCWRITES_NONE = 1; // replication only supports eventual consistency or less
const QOS_SYNCWRITES_BE = 2; // best effort synchronous with limited retries
const QOS_SYNCWRITES_QC = 3; // write quorum applied directly to state machines where R+W > N
const QOS_SYNCWRITES_SS = 4; // strict-serializable, nodes refuse reads if possible stale
// Generic "unknown" value that is useful for comparisons (e.g. always good enough)
const QOS_UNKNOWN = INF;
}
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