67 lines
2.5 KiB
PHP
67 lines
2.5 KiB
PHP
<?php
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/**
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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* @ingroup Cache
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* @author 2015 Timo Tijhof
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*/
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/**
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* Generic interface for lightweight expiring object stores.
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*
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* Provides convenient TTL constants.
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*
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* @ingroup Cache
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* @since 1.27
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*/
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interface IExpiringStore {
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// Constants for TTL values, in seconds
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const TTL_SECOND = 1;
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const TTL_MINUTE = 60;
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const TTL_HOUR = 3600;
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const TTL_DAY = 86400; // 24 * 3600
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const TTL_WEEK = 604800; // 7 * 24 * 3600
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const TTL_MONTH = 2592000; // 30 * 24 * 3600
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const TTL_YEAR = 31536000; // 365 * 24 * 3600
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// Shorthand process cache TTLs (useful for web requests and CLI mode)
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const TTL_PROC_SHORT = 3; // reasonably strict cache time that last the life of quick requests
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const TTL_PROC_LONG = 30; // loose cache time that can survive slow web requests
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const TTL_INDEFINITE = 0;
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// Emulation/fallback medium attribute (e.g. SQLBagOStuff)
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const ATTR_EMULATION = 1;
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// Quality of service constants for ATTR_EMULATION (higher means faster)
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const QOS_EMULATION_SQL = 1;
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// Replica synchronization/consistency attribute of medium when SYNC_WRITES is used
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const ATTR_SYNCWRITES = 2;
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// Quality of service constants for ATTR_SYNCWRITES (higher means more consistent)
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const QOS_SYNCWRITES_NONE = 1; // replication only supports eventual consistency or less
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const QOS_SYNCWRITES_BE = 2; // best effort synchronous with limited retries
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const QOS_SYNCWRITES_QC = 3; // write quorum applied directly to state machines where R+W > N
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const QOS_SYNCWRITES_SS = 4; // strict-serializable, nodes refuse reads if possible stale
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// Generic "unknown" value that is useful for comparisons (e.g. always good enough)
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const QOS_UNKNOWN = INF;
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const ERR_NONE = 0; // no error
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const ERR_NO_RESPONSE = 1; // no response
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const ERR_UNREACHABLE = 2; // can't connect
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const ERR_UNEXPECTED = 3; // response gave some error
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}
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