e5a3e36bd1
Only has 1 use outside libs/objectcache, recently introduced in the ApiFeatureUsage extension, fixed in Ied085eb5. The uses of it already documented against BagOStuff, e.g. getLastError() returns a BagOStuff::ERR_ constant, not StorageAwareness. To simplify the API and reduce clutter and improve cohesion, move this gradually back in. Change-Id: I836735b1fec8dfdcb82804cd5a698047d6a6a7c7
57 lines
2.3 KiB
PHP
57 lines
2.3 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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*/
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namespace Wikimedia\LightweightObjectStore;
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/**
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* Generic interface providing error code and quality-of-service constants for object stores
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*
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* @internal For use by BagOStuff and WANObjectCache
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* @ingroup Cache
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*/
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interface StorageAwareness {
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/** No storage medium error */
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public const ERR_NONE = 0;
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/** Storage medium failed to yield a complete response to an operation */
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public const ERR_NO_RESPONSE = 1;
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/** Storage medium could not be reached to establish a connection */
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public const ERR_UNREACHABLE = 2;
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/** Storage medium operation failed due to usage limitations or an I/O error */
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public const ERR_UNEXPECTED = 3;
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/** @deprecated Since 1.41; Emulation/fallback mode; see QOS_EMULATION_*; higher is better */
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public const ATTR_EMULATION = 1;
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/** Durability of writes; see QOS_DURABILITY_* (higher means stronger) */
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public const ATTR_DURABILITY = 2;
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/** Data is never saved to begin with (blackhole store) */
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public const QOS_DURABILITY_NONE = 1;
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/** Data is lost at the end of the current web request or CLI script */
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public const QOS_DURABILITY_SCRIPT = 2;
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/** Data is lost once the service storing the data restarts */
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public const QOS_DURABILITY_SERVICE = 3;
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/** Data is saved to disk and writes do not usually block on fsync() */
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public const QOS_DURABILITY_DISK = 4;
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/** Data is saved to disk and writes usually block on fsync(), like a standard RDBMS */
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public const QOS_DURABILITY_RDBMS = 5;
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/** Generic "unknown" value; useful for comparisons (always "good enough") */
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public const QOS_UNKNOWN = INF;
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}
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