Merge branch 'archwiki'

Conflicts:
	extensions/FluxBBAuthPlugin.php
	extensions/SyntaxHighlight_GeSHi/README
	extensions/SyntaxHighlight_GeSHi/SyntaxHighlight_GeSHi.class.php
	extensions/SyntaxHighlight_GeSHi/SyntaxHighlight_GeSHi.i18n.php
	extensions/SyntaxHighlight_GeSHi/SyntaxHighlight_GeSHi.php
	extensions/SyntaxHighlight_GeSHi/geshi/docs/CHANGES
	extensions/SyntaxHighlight_GeSHi/geshi/docs/THANKS
	extensions/SyntaxHighlight_GeSHi/geshi/docs/TODO
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/AbstractClass.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/AbstractClass_logo.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/AbstractMethod.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/AbstractPrivateClass.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/AbstractPrivateClass_logo.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/AbstractPrivateMethod.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Class.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Class_logo.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Constant.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Constructor.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Destructor.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Function.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Global.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/I.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Index.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Interface.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Interface_logo.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/L.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Lminus.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Lplus.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Method.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Page.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Page_logo.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/PrivateClass.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/PrivateClass_logo.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/PrivateMethod.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/PrivateVariable.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/StaticMethod.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/StaticVariable.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/T.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Tminus.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Tplus.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Variable.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/blank.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/class_folder.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/file.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/folder.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/function_folder.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/next_button.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/next_button_disabled.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/package.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/package_folder.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/previous_button.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/previous_button_disabled.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/private_class_logo.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/tutorial.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/tutorial_folder.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/up_button.png
	extensions/SyntaxHighlight_GeSHi/geshi/docs/geshi-doc.html
	extensions/SyntaxHighlight_GeSHi/geshi/docs/geshi-doc.txt
	extensions/SyntaxHighlight_GeSHi/geshi/geshi.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/4cs.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/6502acme.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/6502kickass.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/6502tasm.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/68000devpac.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/abap.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/actionscript.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/actionscript3.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/ada.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/algol68.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/apache.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/applescript.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/apt_sources.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/asm.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/asp.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/autoconf.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/autohotkey.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/autoit.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/avisynth.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/awk.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/bascomavr.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/bash.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/basic4gl.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/bf.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/bibtex.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/blitzbasic.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/bnf.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/boo.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/c.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/c_loadrunner.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/c_mac.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/caddcl.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/cadlisp.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/cfdg.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/cfm.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/chaiscript.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/cil.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/clojure.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/cmake.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/cobol.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/coffeescript.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/cpp-qt.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/cpp.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/csharp.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/css.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/cuesheet.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/d.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/dcs.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/delphi.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/diff.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/div.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/dos.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/dot.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/e.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/ecmascript.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/eiffel.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/email.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/epc.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/erlang.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/euphoria.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/f1.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/falcon.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/fo.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/fortran.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/freebasic.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/fsharp.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/gambas.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/gdb.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/genero.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/genie.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/gettext.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/glsl.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/gml.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/gnuplot.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/go.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/groovy.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/gwbasic.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/haskell.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/hicest.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/hq9plus.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/html4strict.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/html5.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/icon.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/idl.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/ini.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/inno.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/intercal.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/io.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/j.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/java.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/java5.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/javascript.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/jquery.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/kixtart.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/klonec.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/klonecpp.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/latex.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/lb.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/lisp.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/llvm.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/locobasic.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/logtalk.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/lolcode.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/lotusformulas.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/lotusscript.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/lscript.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/lsl2.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/lua.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/m68k.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/magiksf.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/make.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/mapbasic.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/matlab.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/mirc.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/mmix.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/modula2.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/modula3.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/mpasm.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/mxml.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/mysql.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/newlisp.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/nsis.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/oberon2.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/objc.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/objeck.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/ocaml-brief.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/ocaml.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/oobas.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/oracle11.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/oracle8.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/oxygene.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/oz.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/pascal.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/pcre.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/per.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/perl.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/perl6.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/pf.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/php-brief.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/php.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/pic16.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/pike.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/pixelbender.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/pli.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/plsql.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/postgresql.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/povray.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/powerbuilder.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/powershell.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/proftpd.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/progress.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/prolog.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/properties.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/providex.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/purebasic.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/pycon.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/python.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/q.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/qbasic.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/rails.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/rebol.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/reg.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/robots.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/rpmspec.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/rsplus.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/ruby.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/sas.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/scala.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/scheme.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/scilab.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/sdlbasic.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/smalltalk.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/smarty.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/sql.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/systemverilog.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/tcl.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/teraterm.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/text.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/thinbasic.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/tsql.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/typoscript.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/unicon.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/uscript.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/vala.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/vb.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/vbnet.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/verilog.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/vhdl.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/vim.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/visualfoxpro.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/visualprolog.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/whitespace.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/whois.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/winbatch.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/xbasic.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/xml.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/xorg_conf.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/xpp.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/yaml.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/z80.php
	extensions/SyntaxHighlight_GeSHi/geshi/geshi/zxbasic.php

1 files changed, 706 insertions, 0 deletions

diff --git a/includes/job/JobQueue.php b/includes/job/JobQueue.php
new file mode 100644
index 00000000..6556ee85
--- /dev/null
+++ b/includes/job/JobQueue.php
@@ -0,0 +1,706 @@
+<?php
+/**
+ * Job queue base code.
+ *
+ * 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
+ * @defgroup JobQueue JobQueue
+ * @author Aaron Schulz
+ */
+
+/**
+ * Class to handle enqueueing and running of background jobs
+ *
+ * @ingroup JobQueue
+ * @since 1.21
+ */
+abstract class JobQueue {
+	protected $wiki; // string; wiki ID
+	protected $type; // string; job type
+	protected $order; // string; job priority for pop()
+	protected $claimTTL; // integer; seconds
+	protected $maxTries; // integer; maximum number of times to try a job
+	protected $checkDelay; // boolean; allow delayed jobs
+
+	/** @var BagOStuff */
+	protected $dupCache;
+
+	const QOS_ATOMIC = 1; // integer; "all-or-nothing" job insertions
+
+	const ROOTJOB_TTL = 2419200; // integer; seconds to remember root jobs (28 days)
+
+	/**
+	 * @param $params array
+	 */
+	protected function __construct( array $params ) {
+		$this->wiki = $params['wiki'];
+		$this->type = $params['type'];
+		$this->claimTTL = isset( $params['claimTTL'] ) ? $params['claimTTL'] : 0;
+		$this->maxTries = isset( $params['maxTries'] ) ? $params['maxTries'] : 3;
+		if ( isset( $params['order'] ) && $params['order'] !== 'any' ) {
+			$this->order = $params['order'];
+		} else {
+			$this->order = $this->optimalOrder();
+		}
+		if ( !in_array( $this->order, $this->supportedOrders() ) ) {
+			throw new MWException( __CLASS__ . " does not support '{$this->order}' order." );
+		}
+		$this->checkDelay = !empty( $params['checkDelay'] );
+		if ( $this->checkDelay && !$this->supportsDelayedJobs() ) {
+			throw new MWException( __CLASS__ . " does not support delayed jobs." );
+		}
+		$this->dupCache = wfGetCache( CACHE_ANYTHING );
+	}
+
+	/**
+	 * Get a job queue object of the specified type.
+	 * $params includes:
+	 *   - class      : What job class to use (determines job type)
+	 *   - wiki       : wiki ID of the wiki the jobs are for (defaults to current wiki)
+	 *   - type       : The name of the job types this queue handles
+	 *   - order      : Order that pop() selects jobs, one of "fifo", "timestamp" or "random".
+	 *                  If "fifo" is used, the queue will effectively be FIFO. Note that job
+	 *                  completion will not appear to be exactly FIFO if there are multiple
+	 *                  job runners since jobs can take different times to finish once popped.
+	 *                  If "timestamp" is used, the queue will at least be loosely ordered
+	 *                  by timestamp, allowing for some jobs to be popped off out of order.
+	 *                  If "random" is used, pop() will pick jobs in random order.
+	 *                  Note that it may only be weakly random (e.g. a lottery of the oldest X).
+	 *                  If "any" is choosen, the queue will use whatever order is the fastest.
+	 *                  This might be useful for improving concurrency for job acquisition.
+	 *   - claimTTL   : If supported, the queue will recycle jobs that have been popped
+	 *                  but not acknowledged as completed after this many seconds. Recycling
+	 *                  of jobs simple means re-inserting them into the queue. Jobs can be
+	 *                  attempted up to three times before being discarded.
+	 *   - checkDelay : If supported, respect Job::getReleaseTimestamp() in the push functions.
+	 *                  This lets delayed jobs wait in a staging area until a given timestamp is
+	 *                  reached, at which point they will enter the queue. If this is not enabled
+	 *                  or not supported, an exception will be thrown on delayed job insertion.
+	 *
+	 * Queue classes should throw an exception if they do not support the options given.
+	 *
+	 * @param $params array
+	 * @return JobQueue
+	 * @throws MWException
+	 */
+	final public static function factory( array $params ) {
+		$class = $params['class'];
+		if ( !class_exists( $class ) ) {
+			throw new MWException( "Invalid job queue class '$class'." );
+		}
+		$obj = new $class( $params );
+		if ( !( $obj instanceof self ) ) {
+			throw new MWException( "Class '$class' is not a " . __CLASS__ . " class." );
+		}
+		return $obj;
+	}
+
+	/**
+	 * @return string Wiki ID
+	 */
+	final public function getWiki() {
+		return $this->wiki;
+	}
+
+	/**
+	 * @return string Job type that this queue handles
+	 */
+	final public function getType() {
+		return $this->type;
+	}
+
+	/**
+	 * @return string One of (random, timestamp, fifo, undefined)
+	 */
+	final public function getOrder() {
+		return $this->order;
+	}
+
+	/**
+	 * @return bool Whether delayed jobs are enabled
+	 * @since 1.22
+	 */
+	final public function delayedJobsEnabled() {
+		return $this->checkDelay;
+	}
+
+	/**
+	 * Get the allowed queue orders for configuration validation
+	 *
+	 * @return Array Subset of (random, timestamp, fifo, undefined)
+	 */
+	abstract protected function supportedOrders();
+
+	/**
+	 * Get the default queue order to use if configuration does not specify one
+	 *
+	 * @return string One of (random, timestamp, fifo, undefined)
+	 */
+	abstract protected function optimalOrder();
+
+	/**
+	 * Find out if delayed jobs are supported for configuration validation
+	 *
+	 * @return boolean Whether delayed jobs are supported
+	 */
+	protected function supportsDelayedJobs() {
+		return false; // not implemented
+	}
+
+	/**
+	 * Quickly check if the queue has no available (unacquired, non-delayed) jobs.
+	 * Queue classes should use caching if they are any slower without memcached.
+	 *
+	 * If caching is used, this might return false when there are actually no jobs.
+	 * If pop() is called and returns false then it should correct the cache. Also,
+	 * calling flushCaches() first prevents this. However, this affect is typically
+	 * not distinguishable from the race condition between isEmpty() and pop().
+	 *
+	 * @return bool
+	 * @throws JobQueueError
+	 */
+	final public function isEmpty() {
+		wfProfileIn( __METHOD__ );
+		$res = $this->doIsEmpty();
+		wfProfileOut( __METHOD__ );
+		return $res;
+	}
+
+	/**
+	 * @see JobQueue::isEmpty()
+	 * @return bool
+	 */
+	abstract protected function doIsEmpty();
+
+	/**
+	 * Get the number of available (unacquired, non-delayed) jobs in the queue.
+	 * Queue classes should use caching if they are any slower without memcached.
+	 *
+	 * If caching is used, this number might be out of date for a minute.
+	 *
+	 * @return integer
+	 * @throws JobQueueError
+	 */
+	final public function getSize() {
+		wfProfileIn( __METHOD__ );
+		$res = $this->doGetSize();
+		wfProfileOut( __METHOD__ );
+		return $res;
+	}
+
+	/**
+	 * @see JobQueue::getSize()
+	 * @return integer
+	 */
+	abstract protected function doGetSize();
+
+	/**
+	 * Get the number of acquired jobs (these are temporarily out of the queue).
+	 * Queue classes should use caching if they are any slower without memcached.
+	 *
+	 * If caching is used, this number might be out of date for a minute.
+	 *
+	 * @return integer
+	 * @throws JobQueueError
+	 */
+	final public function getAcquiredCount() {
+		wfProfileIn( __METHOD__ );
+		$res = $this->doGetAcquiredCount();
+		wfProfileOut( __METHOD__ );
+		return $res;
+	}
+
+	/**
+	 * @see JobQueue::getAcquiredCount()
+	 * @return integer
+	 */
+	abstract protected function doGetAcquiredCount();
+
+	/**
+	 * Get the number of delayed jobs (these are temporarily out of the queue).
+	 * Queue classes should use caching if they are any slower without memcached.
+	 *
+	 * If caching is used, this number might be out of date for a minute.
+	 *
+	 * @return integer
+	 * @throws JobQueueError
+	 * @since 1.22
+	 */
+	final public function getDelayedCount() {
+		wfProfileIn( __METHOD__ );
+		$res = $this->doGetDelayedCount();
+		wfProfileOut( __METHOD__ );
+		return $res;
+	}
+
+	/**
+	 * @see JobQueue::getDelayedCount()
+	 * @return integer
+	 */
+	protected function doGetDelayedCount() {
+		return 0; // not implemented
+	}
+
+	/**
+	 * Get the number of acquired jobs that can no longer be attempted.
+	 * Queue classes should use caching if they are any slower without memcached.
+	 *
+	 * If caching is used, this number might be out of date for a minute.
+	 *
+	 * @return integer
+	 * @throws JobQueueError
+	 */
+	final public function getAbandonedCount() {
+		wfProfileIn( __METHOD__ );
+		$res = $this->doGetAbandonedCount();
+		wfProfileOut( __METHOD__ );
+		return $res;
+	}
+
+	/**
+	 * @see JobQueue::getAbandonedCount()
+	 * @return integer
+	 */
+	protected function doGetAbandonedCount() {
+		return 0; // not implemented
+	}
+
+	/**
+	 * Push a single jobs into the queue.
+	 * This does not require $wgJobClasses to be set for the given job type.
+	 * Outside callers should use JobQueueGroup::push() instead of this function.
+	 *
+	 * @param $jobs Job|Array
+	 * @param $flags integer Bitfield (supports JobQueue::QOS_ATOMIC)
+	 * @return bool Returns false on failure
+	 * @throws JobQueueError
+	 */
+	final public function push( $jobs, $flags = 0 ) {
+		return $this->batchPush( is_array( $jobs ) ? $jobs : array( $jobs ), $flags );
+	}
+
+	/**
+	 * Push a batch of jobs into the queue.
+	 * This does not require $wgJobClasses to be set for the given job type.
+	 * Outside callers should use JobQueueGroup::push() instead of this function.
+	 *
+	 * @param array $jobs List of Jobs
+	 * @param $flags integer Bitfield (supports JobQueue::QOS_ATOMIC)
+	 * @return bool Returns false on failure
+	 * @throws JobQueueError
+	 */
+	final public function batchPush( array $jobs, $flags = 0 ) {
+		if ( !count( $jobs ) ) {
+			return true; // nothing to do
+		}
+
+		foreach ( $jobs as $job ) {
+			if ( $job->getType() !== $this->type ) {
+				throw new MWException(
+					"Got '{$job->getType()}' job; expected a '{$this->type}' job." );
+			} elseif ( $job->getReleaseTimestamp() && !$this->checkDelay ) {
+				throw new MWException(
+					"Got delayed '{$job->getType()}' job; delays are not supported." );
+			}
+		}
+
+		wfProfileIn( __METHOD__ );
+		$ok = $this->doBatchPush( $jobs, $flags );
+		wfProfileOut( __METHOD__ );
+		return $ok;
+	}
+
+	/**
+	 * @see JobQueue::batchPush()
+	 * @return bool
+	 */
+	abstract protected function doBatchPush( array $jobs, $flags );
+
+	/**
+	 * Pop a job off of the queue.
+	 * This requires $wgJobClasses to be set for the given job type.
+	 * Outside callers should use JobQueueGroup::pop() instead of this function.
+	 *
+	 * @return Job|bool Returns false if there are no jobs
+	 * @throws JobQueueError
+	 */
+	final public function pop() {
+		global $wgJobClasses;
+
+		if ( $this->wiki !== wfWikiID() ) {
+			throw new MWException( "Cannot pop '{$this->type}' job off foreign wiki queue." );
+		} elseif ( !isset( $wgJobClasses[$this->type] ) ) {
+			// Do not pop jobs if there is no class for the queue type
+			throw new MWException( "Unrecognized job type '{$this->type}'." );
+		}
+
+		wfProfileIn( __METHOD__ );
+		$job = $this->doPop();
+		wfProfileOut( __METHOD__ );
+
+		// Flag this job as an old duplicate based on its "root" job...
+		try {
+			if ( $job && $this->isRootJobOldDuplicate( $job ) ) {
+				JobQueue::incrStats( 'job-pop-duplicate', $this->type );
+				$job = DuplicateJob::newFromJob( $job ); // convert to a no-op
+			}
+		} catch ( MWException $e ) {} // don't lose jobs over this
+
+		return $job;
+	}
+
+	/**
+	 * @see JobQueue::pop()
+	 * @return Job
+	 */
+	abstract protected function doPop();
+
+	/**
+	 * Acknowledge that a job was completed.
+	 *
+	 * This does nothing for certain queue classes or if "claimTTL" is not set.
+	 * Outside callers should use JobQueueGroup::ack() instead of this function.
+	 *
+	 * @param $job Job
+	 * @return bool
+	 * @throws JobQueueError
+	 */
+	final public function ack( Job $job ) {
+		if ( $job->getType() !== $this->type ) {
+			throw new MWException( "Got '{$job->getType()}' job; expected '{$this->type}'." );
+		}
+		wfProfileIn( __METHOD__ );
+		$ok = $this->doAck( $job );
+		wfProfileOut( __METHOD__ );
+		return $ok;
+	}
+
+	/**
+	 * @see JobQueue::ack()
+	 * @return bool
+	 */
+	abstract protected function doAck( Job $job );
+
+	/**
+	 * Register the "root job" of a given job into the queue for de-duplication.
+	 * This should only be called right *after* all the new jobs have been inserted.
+	 * This is used to turn older, duplicate, job entries into no-ops. The root job
+	 * information will remain in the registry until it simply falls out of cache.
+	 *
+	 * This requires that $job has two special fields in the "params" array:
+	 *   - rootJobSignature : hash (e.g. SHA1) that identifies the task
+	 *   - rootJobTimestamp : TS_MW timestamp of this instance of the task
+	 *
+	 * A "root job" is a conceptual job that consist of potentially many smaller jobs
+	 * that are actually inserted into the queue. For example, "refreshLinks" jobs are
+	 * spawned when a template is edited. One can think of the task as "update links
+	 * of pages that use template X" and an instance of that task as a "root job".
+	 * However, what actually goes into the queue are potentially many refreshLinks2 jobs.
+	 * Since these jobs include things like page ID ranges and DB master positions, and morph
+	 * into smaller refreshLinks2 jobs recursively, simple duplicate detection (like job_sha1)
+	 * for individual jobs being identical is not useful.
+	 *
+	 * In the case of "refreshLinks", if these jobs are still in the queue when the template
+	 * is edited again, we want all of these old refreshLinks jobs for that template to become
+	 * no-ops. This can greatly reduce server load, since refreshLinks jobs involves parsing.
+	 * Essentially, the new batch of jobs belong to a new "root job" and the older ones to a
+	 * previous "root job" for the same task of "update links of pages that use template X".
+	 *
+	 * This does nothing for certain queue classes.
+	 *
+	 * @param $job Job
+	 * @return bool
+	 * @throws JobQueueError
+	 */
+	final public function deduplicateRootJob( Job $job ) {
+		if ( $job->getType() !== $this->type ) {
+			throw new MWException( "Got '{$job->getType()}' job; expected '{$this->type}'." );
+		}
+		wfProfileIn( __METHOD__ );
+		$ok = $this->doDeduplicateRootJob( $job );
+		wfProfileOut( __METHOD__ );
+		return $ok;
+	}
+
+	/**
+	 * @see JobQueue::deduplicateRootJob()
+	 * @param $job Job
+	 * @return bool
+	 */
+	protected function doDeduplicateRootJob( Job $job ) {
+		if ( !$job->hasRootJobParams() ) {
+			throw new MWException( "Cannot register root job; missing parameters." );
+		}
+		$params = $job->getRootJobParams();
+
+		$key = $this->getRootJobCacheKey( $params['rootJobSignature'] );
+		// Callers should call batchInsert() and then this function so that if the insert
+		// fails, the de-duplication registration will be aborted. Since the insert is
+		// deferred till "transaction idle", do the same here, so that the ordering is
+		// maintained. Having only the de-duplication registration succeed would cause
+		// jobs to become no-ops without any actual jobs that made them redundant.
+		$timestamp = $this->dupCache->get( $key ); // current last timestamp of this job
+		if ( $timestamp && $timestamp >= $params['rootJobTimestamp'] ) {
+			return true; // a newer version of this root job was enqueued
+		}
+
+		// Update the timestamp of the last root job started at the location...
+		return $this->dupCache->set( $key, $params['rootJobTimestamp'], JobQueueDB::ROOTJOB_TTL );
+	}
+
+	/**
+	 * Check if the "root" job of a given job has been superseded by a newer one
+	 *
+	 * @param $job Job
+	 * @return bool
+	 * @throws JobQueueError
+	 */
+	final protected function isRootJobOldDuplicate( Job $job ) {
+		if ( $job->getType() !== $this->type ) {
+			throw new MWException( "Got '{$job->getType()}' job; expected '{$this->type}'." );
+		}
+		wfProfileIn( __METHOD__ );
+		$isDuplicate = $this->doIsRootJobOldDuplicate( $job );
+		wfProfileOut( __METHOD__ );
+		return $isDuplicate;
+	}
+
+	/**
+	 * @see JobQueue::isRootJobOldDuplicate()
+	 * @param Job $job
+	 * @return bool
+	 */
+	protected function doIsRootJobOldDuplicate( Job $job ) {
+		if ( !$job->hasRootJobParams() ) {
+			return false; // job has no de-deplication info
+		}
+		$params = $job->getRootJobParams();
+
+		$key = $this->getRootJobCacheKey( $params['rootJobSignature'] );
+		// Get the last time this root job was enqueued
+		$timestamp = $this->dupCache->get( $key );
+
+		// Check if a new root job was started at the location after this one's...
+		return ( $timestamp && $timestamp > $params['rootJobTimestamp'] );
+	}
+
+	/**
+	 * @param string $signature Hash identifier of the root job
+	 * @return string
+	 */
+	protected function getRootJobCacheKey( $signature ) {
+		list( $db, $prefix ) = wfSplitWikiID( $this->wiki );
+		return wfForeignMemcKey( $db, $prefix, 'jobqueue', $this->type, 'rootjob', $signature );
+	}
+
+	/**
+	 * Deleted all unclaimed and delayed jobs from the queue
+	 *
+	 * @return bool Success
+	 * @throws JobQueueError
+	 * @since 1.22
+	 */
+	final public function delete() {
+		wfProfileIn( __METHOD__ );
+		$res = $this->doDelete();
+		wfProfileOut( __METHOD__ );
+		return $res;
+	}
+
+	/**
+	 * @see JobQueue::delete()
+	 * @return bool Success
+	 */
+	protected function doDelete() {
+		throw new MWException( "This method is not implemented." );
+	}
+
+	/**
+	 * Wait for any slaves or backup servers to catch up.
+	 *
+	 * This does nothing for certain queue classes.
+	 *
+	 * @return void
+	 * @throws JobQueueError
+	 */
+	final public function waitForBackups() {
+		wfProfileIn( __METHOD__ );
+		$this->doWaitForBackups();
+		wfProfileOut( __METHOD__ );
+	}
+
+	/**
+	 * @see JobQueue::waitForBackups()
+	 * @return void
+	 */
+	protected function doWaitForBackups() {}
+
+	/**
+	 * Return a map of task names to task definition maps.
+	 * A "task" is a fast periodic queue maintenance action.
+	 * Mutually exclusive tasks must implement their own locking in the callback.
+	 *
+	 * Each task value is an associative array with:
+	 *   - name     : the name of the task
+	 *   - callback : a PHP callable that performs the task
+	 *   - period   : the period in seconds corresponding to the task frequency
+	 *
+	 * @return Array
+	 */
+	final public function getPeriodicTasks() {
+		$tasks = $this->doGetPeriodicTasks();
+		foreach ( $tasks as $name => &$def ) {
+			$def['name'] = $name;
+		}
+		return $tasks;
+	}
+
+	/**
+	 * @see JobQueue::getPeriodicTasks()
+	 * @return Array
+	 */
+	protected function doGetPeriodicTasks() {
+		return array();
+	}
+
+	/**
+	 * Clear any process and persistent caches
+	 *
+	 * @return void
+	 */
+	final public function flushCaches() {
+		wfProfileIn( __METHOD__ );
+		$this->doFlushCaches();
+		wfProfileOut( __METHOD__ );
+	}
+
+	/**
+	 * @see JobQueue::flushCaches()
+	 * @return void
+	 */
+	protected function doFlushCaches() {}
+
+	/**
+	 * Get an iterator to traverse over all available jobs in this queue.
+	 * This does not include jobs that are currently acquired or delayed.
+	 * Note: results may be stale if the queue is concurrently modified.
+	 *
+	 * @return Iterator
+	 * @throws JobQueueError
+	 */
+	abstract public function getAllQueuedJobs();
+
+	/**
+	 * Get an iterator to traverse over all delayed jobs in this queue.
+	 * Note: results may be stale if the queue is concurrently modified.
+	 *
+	 * @return Iterator
+	 * @throws JobQueueError
+	 * @since 1.22
+	 */
+	public function getAllDelayedJobs() {
+		return new ArrayIterator( array() ); // not implemented
+	}
+
+	/**
+	 * Do not use this function outside of JobQueue/JobQueueGroup
+	 *
+	 * @return string
+	 * @since 1.22
+	 */
+	public function getCoalesceLocationInternal() {
+		return null;
+	}
+
+	/**
+	 * Check whether each of the given queues are empty.
+	 * This is used for batching checks for queues stored at the same place.
+	 *
+	 * @param array $types List of queues types
+	 * @return array|null (list of non-empty queue types) or null if unsupported
+	 * @throws MWException
+	 * @since 1.22
+	 */
+	final public function getSiblingQueuesWithJobs( array $types ) {
+		$section = new ProfileSection( __METHOD__ );
+		return $this->doGetSiblingQueuesWithJobs( $types );
+	}
+
+	/**
+	 * @see JobQueue::getSiblingQueuesWithJobs()
+	 * @param array $types List of queues types
+	 * @return array|null (list of queue types) or null if unsupported
+	 */
+	protected function doGetSiblingQueuesWithJobs( array $types ) {
+		return null; // not supported
+	}
+
+	/**
+	 * Check the size of each of the given queues.
+	 * For queues not served by the same store as this one, 0 is returned.
+	 * This is used for batching checks for queues stored at the same place.
+	 *
+	 * @param array $types List of queues types
+	 * @return array|null (job type => whether queue is empty) or null if unsupported
+	 * @throws MWException
+	 * @since 1.22
+	 */
+	final public function getSiblingQueueSizes( array $types ) {
+		$section = new ProfileSection( __METHOD__ );
+		return $this->doGetSiblingQueueSizes( $types );
+	}
+
+	/**
+	 * @see JobQueue::getSiblingQueuesSize()
+	 * @param array $types List of queues types
+	 * @return array|null (list of queue types) or null if unsupported
+	 */
+	protected function doGetSiblingQueueSizes( array $types ) {
+		return null; // not supported
+	}
+
+	/**
+	 * Call wfIncrStats() for the queue overall and for the queue type
+	 *
+	 * @param string $key Event type
+	 * @param string $type Job type
+	 * @param integer $delta
+	 * @since 1.22
+	 */
+	public static function incrStats( $key, $type, $delta = 1 ) {
+		wfIncrStats( $key, $delta );
+		wfIncrStats( "{$key}-{$type}", $delta );
+	}
+
+	/**
+	 * Namespace the queue with a key to isolate it for testing
+	 *
+	 * @param $key string
+	 * @return void
+	 * @throws MWException
+	 */
+	public function setTestingPrefix( $key ) {
+		throw new MWException( "Queue namespacing not supported for this queue type." );
+	}
+}
+
+/**
+ * @ingroup JobQueue
+ * @since 1.22
+ */
+class JobQueueError extends MWException {}
+class JobQueueConnectionError extends JobQueueError {}