%PDF-
%PDF-
Mini Shell
Mini Shell
<?php
/**
* Copyright © 2003-2004 Brion Vibber <brion@pobox.com>
* https://www.mediawiki.org/
*
* 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
*/
/**
* @defgroup Cache Cache
*/
use Psr\Log\LoggerAwareInterface;
use Psr\Log\LoggerInterface;
use Psr\Log\NullLogger;
use Wikimedia\ScopedCallback;
use Wikimedia\WaitConditionLoop;
/**
* Class representing a cache/ephemeral data store
*
* This interface is intended to be more or less compatible with the PHP memcached client.
*
* Instances of this class should be created with an intended access scope, such as:
* - a) A single PHP thread on a server (e.g. stored in a PHP variable)
* - b) A single application server (e.g. stored in APC or sqlite)
* - c) All application servers in datacenter (e.g. stored in memcached or mysql)
* - d) All application servers in all datacenters (e.g. stored via mcrouter or dynomite)
*
* Callers should use the proper factory methods that yield BagOStuff instances. Site admins
* should make sure the configuration for those factory methods matches their access scope.
* BagOStuff subclasses have widely varying levels of support for replication features.
*
* For any given instance, methods like lock(), unlock(), merge(), and set() with WRITE_SYNC
* should semantically operate over its entire access scope; any nodes/threads in that scope
* should serialize appropriately when using them. Likewise, a call to get() with READ_LATEST
* from one node in its access scope should reflect the prior changes of any other node its access
* scope. Any get() should reflect the changes of any prior set() with WRITE_SYNC.
*
* @ingroup Cache
*/
abstract class BagOStuff implements IExpiringStore, LoggerAwareInterface {
/** @var array[] Lock tracking */
protected $locks = [];
/** @var int ERR_* class constant */
protected $lastError = self::ERR_NONE;
/** @var string */
protected $keyspace = 'local';
/** @var LoggerInterface */
protected $logger;
/** @var callback|null */
protected $asyncHandler;
/** @var int Seconds */
protected $syncTimeout;
/** @var bool */
private $debugMode = false;
/** @var array */
private $duplicateKeyLookups = [];
/** @var bool */
private $reportDupes = false;
/** @var bool */
private $dupeTrackScheduled = false;
/** @var callable[] */
protected $busyCallbacks = [];
/** @var float|null */
private $wallClockOverride;
/** @var int[] Map of (ATTR_* class constant => QOS_* class constant) */
protected $attrMap = [];
/** Possible values for getLastError() */
const ERR_NONE = 0; // no error
const ERR_NO_RESPONSE = 1; // no response
const ERR_UNREACHABLE = 2; // can't connect
const ERR_UNEXPECTED = 3; // response gave some error
/** Bitfield constants for get()/getMulti() */
const READ_LATEST = 1; // use latest data for replicated stores
const READ_VERIFIED = 2; // promise that caller can tell when keys are stale
/** Bitfield constants for set()/merge() */
const WRITE_SYNC = 1; // synchronously write to all locations for replicated stores
const WRITE_CACHE_ONLY = 2; // Only change state of the in-memory cache
/**
* $params include:
* - logger: Psr\Log\LoggerInterface instance
* - keyspace: Default keyspace for $this->makeKey()
* - asyncHandler: Callable to use for scheduling tasks after the web request ends.
* In CLI mode, it should run the task immediately.
* - reportDupes: Whether to emit warning log messages for all keys that were
* requested more than once (requires an asyncHandler).
* - syncTimeout: How long to wait with WRITE_SYNC in seconds.
* @param array $params
*/
public function __construct( array $params = [] ) {
if ( isset( $params['logger'] ) ) {
$this->setLogger( $params['logger'] );
} else {
$this->setLogger( new NullLogger() );
}
if ( isset( $params['keyspace'] ) ) {
$this->keyspace = $params['keyspace'];
}
$this->asyncHandler = $params['asyncHandler'] ?? null;
if ( !empty( $params['reportDupes'] ) && is_callable( $this->asyncHandler ) ) {
$this->reportDupes = true;
}
$this->syncTimeout = $params['syncTimeout'] ?? 3;
}
/**
* @param LoggerInterface $logger
* @return void
*/
public function setLogger( LoggerInterface $logger ) {
$this->logger = $logger;
}
/**
* @param bool $bool
*/
public function setDebug( $bool ) {
$this->debugMode = $bool;
}
/**
* Get an item with the given key, regenerating and setting it if not found
*
* If the callback returns false, then nothing is stored.
*
* @param string $key
* @param int $ttl Time-to-live (seconds)
* @param callable $callback Callback that derives the new value
* @param int $flags Bitfield of BagOStuff::READ_* constants [optional]
* @return mixed The cached value if found or the result of $callback otherwise
* @since 1.27
*/
final public function getWithSetCallback( $key, $ttl, $callback, $flags = 0 ) {
$value = $this->get( $key, $flags );
if ( $value === false ) {
if ( !is_callable( $callback ) ) {
throw new InvalidArgumentException( "Invalid cache miss callback provided." );
}
$value = call_user_func( $callback );
if ( $value !== false ) {
$this->set( $key, $value, $ttl );
}
}
return $value;
}
/**
* Get an item with the given key
*
* If the key includes a deterministic input hash (e.g. the key can only have
* the correct value) or complete staleness checks are handled by the caller
* (e.g. nothing relies on the TTL), then the READ_VERIFIED flag should be set.
* This lets tiered backends know they can safely upgrade a cached value to
* higher tiers using standard TTLs.
*
* @param string $key
* @param int $flags Bitfield of BagOStuff::READ_* constants [optional]
* @param int|null $oldFlags [unused]
* @return mixed Returns false on failure and if the item does not exist
*/
public function get( $key, $flags = 0, $oldFlags = null ) {
// B/C for ( $key, &$casToken = null, $flags = 0 )
$flags = is_int( $oldFlags ) ? $oldFlags : $flags;
$this->trackDuplicateKeys( $key );
return $this->doGet( $key, $flags );
}
/**
* Track the number of times that a given key has been used.
* @param string $key
*/
private function trackDuplicateKeys( $key ) {
if ( !$this->reportDupes ) {
return;
}
if ( !isset( $this->duplicateKeyLookups[$key] ) ) {
// Track that we have seen this key. This N-1 counting style allows
// easy filtering with array_filter() later.
$this->duplicateKeyLookups[$key] = 0;
} else {
$this->duplicateKeyLookups[$key] += 1;
if ( $this->dupeTrackScheduled === false ) {
$this->dupeTrackScheduled = true;
// Schedule a callback that logs keys processed more than once by get().
call_user_func( $this->asyncHandler, function () {
$dups = array_filter( $this->duplicateKeyLookups );
foreach ( $dups as $key => $count ) {
$this->logger->warning(
'Duplicate get(): "{key}" fetched {count} times',
// Count is N-1 of the actual lookup count
[ 'key' => $key, 'count' => $count + 1, ]
);
}
} );
}
}
}
/**
* @param string $key
* @param int $flags Bitfield of BagOStuff::READ_* constants [optional]
* @return mixed Returns false on failure and if the item does not exist
*/
abstract protected function doGet( $key, $flags = 0 );
/**
* @note This method is only needed if merge() uses mergeViaCas()
*
* @param string $key
* @param mixed &$casToken
* @param int $flags Bitfield of BagOStuff::READ_* constants [optional]
* @return mixed Returns false on failure and if the item does not exist
* @throws Exception
*/
protected function getWithToken( $key, &$casToken, $flags = 0 ) {
throw new Exception( __METHOD__ . ' not implemented.' );
}
/**
* Set an item
*
* @param string $key
* @param mixed $value
* @param int $exptime Either an interval in seconds or a unix timestamp for expiry
* @param int $flags Bitfield of BagOStuff::WRITE_* constants
* @return bool Success
*/
abstract public function set( $key, $value, $exptime = 0, $flags = 0 );
/**
* Delete an item
*
* @param string $key
* @return bool True if the item was deleted or not found, false on failure
*/
abstract public function delete( $key );
/**
* Merge changes into the existing cache value (possibly creating a new one)
*
* The callback function returns the new value given the current value
* (which will be false if not present), and takes the arguments:
* (this BagOStuff, cache key, current value, TTL).
* The TTL parameter is reference set to $exptime. It can be overriden in the callback.
*
* @param string $key
* @param callable $callback Callback method to be executed
* @param int $exptime Either an interval in seconds or a unix timestamp for expiry
* @param int $attempts The amount of times to attempt a merge in case of failure
* @param int $flags Bitfield of BagOStuff::WRITE_* constants
* @return bool Success
* @throws InvalidArgumentException
*/
public function merge( $key, callable $callback, $exptime = 0, $attempts = 10, $flags = 0 ) {
return $this->mergeViaLock( $key, $callback, $exptime, $attempts, $flags );
}
/**
* @see BagOStuff::merge()
*
* @param string $key
* @param callable $callback Callback method to be executed
* @param int $exptime Either an interval in seconds or a unix timestamp for expiry
* @param int $attempts The amount of times to attempt a merge in case of failure
* @return bool Success
*/
protected function mergeViaCas( $key, $callback, $exptime = 0, $attempts = 10 ) {
do {
$this->clearLastError();
$reportDupes = $this->reportDupes;
$this->reportDupes = false;
$casToken = null; // passed by reference
$currentValue = $this->getWithToken( $key, $casToken, self::READ_LATEST );
$this->reportDupes = $reportDupes;
if ( $this->getLastError() ) {
$this->logger->warning(
__METHOD__ . ' failed due to I/O error on get() for {key}.',
[ 'key' => $key ]
);
return false; // don't spam retries (retry only on races)
}
// Derive the new value from the old value
$value = call_user_func( $callback, $this, $key, $currentValue, $exptime );
$this->clearLastError();
if ( $value === false ) {
$success = true; // do nothing
} elseif ( $currentValue === false ) {
// Try to create the key, failing if it gets created in the meantime
$success = $this->add( $key, $value, $exptime );
} else {
// Try to update the key, failing if it gets changed in the meantime
$success = $this->cas( $casToken, $key, $value, $exptime );
}
if ( $this->getLastError() ) {
$this->logger->warning(
__METHOD__ . ' failed due to I/O error for {key}.',
[ 'key' => $key ]
);
return false; // IO error; don't spam retries
}
} while ( !$success && --$attempts );
return $success;
}
/**
* Check and set an item
*
* @param mixed $casToken
* @param string $key
* @param mixed $value
* @param int $exptime Either an interval in seconds or a unix timestamp for expiry
* @return bool Success
* @throws Exception
*/
protected function cas( $casToken, $key, $value, $exptime = 0 ) {
if ( !$this->lock( $key, 0 ) ) {
return false; // non-blocking
}
$curCasToken = null; // passed by reference
$this->getWithToken( $key, $curCasToken, self::READ_LATEST );
if ( $casToken === $curCasToken ) {
$success = $this->set( $key, $value, $exptime );
} else {
$this->logger->info(
__METHOD__ . ' failed due to race condition for {key}.',
[ 'key' => $key ]
);
$success = false; // mismatched or failed
}
$this->unlock( $key );
return $success;
}
/**
* @see BagOStuff::merge()
*
* @param string $key
* @param callable $callback Callback method to be executed
* @param int $exptime Either an interval in seconds or a unix timestamp for expiry
* @param int $attempts The amount of times to attempt a merge in case of failure
* @param int $flags Bitfield of BagOStuff::WRITE_* constants
* @return bool Success
*/
protected function mergeViaLock( $key, $callback, $exptime = 0, $attempts = 10, $flags = 0 ) {
if ( $attempts <= 1 ) {
$timeout = 0; // clearly intended to be "non-blocking"
} else {
$timeout = 3;
}
if ( !$this->lock( $key, $timeout ) ) {
return false;
}
$this->clearLastError();
$reportDupes = $this->reportDupes;
$this->reportDupes = false;
$currentValue = $this->get( $key, self::READ_LATEST );
$this->reportDupes = $reportDupes;
if ( $this->getLastError() ) {
$this->logger->warning(
__METHOD__ . ' failed due to I/O error on get() for {key}.',
[ 'key' => $key ]
);
$success = false;
} else {
// Derive the new value from the old value
$value = call_user_func( $callback, $this, $key, $currentValue, $exptime );
if ( $value === false ) {
$success = true; // do nothing
} else {
$success = $this->set( $key, $value, $exptime, $flags ); // set the new value
}
}
if ( !$this->unlock( $key ) ) {
// this should never happen
trigger_error( "Could not release lock for key '$key'." );
}
return $success;
}
/**
* Reset the TTL on a key if it exists
*
* @param string $key
* @param int $expiry
* @return bool Success Returns false if there is no key
* @since 1.28
*/
public function changeTTL( $key, $expiry = 0 ) {
$value = $this->get( $key );
return ( $value === false ) ? false : $this->set( $key, $value, $expiry );
}
/**
* Acquire an advisory lock on a key string
*
* Note that if reentry is enabled, duplicate calls ignore $expiry
*
* @param string $key
* @param int $timeout Lock wait timeout; 0 for non-blocking [optional]
* @param int $expiry Lock expiry [optional]; 1 day maximum
* @param string $rclass Allow reentry if set and the current lock used this value
* @return bool Success
*/
public function lock( $key, $timeout = 6, $expiry = 6, $rclass = '' ) {
// Avoid deadlocks and allow lock reentry if specified
if ( isset( $this->locks[$key] ) ) {
if ( $rclass != '' && $this->locks[$key]['class'] === $rclass ) {
++$this->locks[$key]['depth'];
return true;
} else {
return false;
}
}
$fname = __METHOD__;
$expiry = min( $expiry ?: INF, self::TTL_DAY );
$loop = new WaitConditionLoop(
function () use ( $key, $timeout, $expiry, $fname ) {
$this->clearLastError();
if ( $this->add( "{$key}:lock", 1, $expiry ) ) {
return true; // locked!
} elseif ( $this->getLastError() ) {
$this->logger->warning(
$fname . ' failed due to I/O error for {key}.',
[ 'key' => $key ]
);
return WaitConditionLoop::CONDITION_ABORTED; // network partition?
}
return WaitConditionLoop::CONDITION_CONTINUE;
},
$timeout
);
$code = $loop->invoke();
$locked = ( $code === $loop::CONDITION_REACHED );
if ( $locked ) {
$this->locks[$key] = [ 'class' => $rclass, 'depth' => 1 ];
} elseif ( $code === $loop::CONDITION_TIMED_OUT ) {
$this->logger->warning(
"$fname failed due to timeout for {key}.",
[ 'key' => $key, 'timeout' => $timeout ]
);
}
return $locked;
}
/**
* Release an advisory lock on a key string
*
* @param string $key
* @return bool Success
*/
public function unlock( $key ) {
if ( isset( $this->locks[$key] ) && --$this->locks[$key]['depth'] <= 0 ) {
unset( $this->locks[$key] );
$ok = $this->delete( "{$key}:lock" );
if ( !$ok ) {
$this->logger->warning(
__METHOD__ . ' failed to release lock for {key}.',
[ 'key' => $key ]
);
}
return $ok;
}
return true;
}
/**
* Get a lightweight exclusive self-unlocking lock
*
* Note that the same lock cannot be acquired twice.
*
* This is useful for task de-duplication or to avoid obtrusive
* (though non-corrupting) DB errors like INSERT key conflicts
* or deadlocks when using LOCK IN SHARE MODE.
*
* @param string $key
* @param int $timeout Lock wait timeout; 0 for non-blocking [optional]
* @param int $expiry Lock expiry [optional]; 1 day maximum
* @param string $rclass Allow reentry if set and the current lock used this value
* @return ScopedCallback|null Returns null on failure
* @since 1.26
*/
final public function getScopedLock( $key, $timeout = 6, $expiry = 30, $rclass = '' ) {
$expiry = min( $expiry ?: INF, self::TTL_DAY );
if ( !$this->lock( $key, $timeout, $expiry, $rclass ) ) {
return null;
}
$lSince = $this->getCurrentTime(); // lock timestamp
return new ScopedCallback( function () use ( $key, $lSince, $expiry ) {
$latency = 0.050; // latency skew (err towards keeping lock present)
$age = ( $this->getCurrentTime() - $lSince + $latency );
if ( ( $age + $latency ) >= $expiry ) {
$this->logger->warning(
"Lock for {key} held too long ({age} sec).",
[ 'key' => $key, 'age' => $age ]
);
return; // expired; it's not "safe" to delete the key
}
$this->unlock( $key );
} );
}
/**
* Delete all objects expiring before a certain date.
* @param string $date The reference date in MW format
* @param callable|bool $progressCallback Optional, a function which will be called
* regularly during long-running operations with the percentage progress
* as the first parameter.
*
* @return bool Success, false if unimplemented
*/
public function deleteObjectsExpiringBefore( $date, $progressCallback = false ) {
// stub
return false;
}
/**
* Get an associative array containing the item for each of the keys that have items.
* @param array $keys List of strings
* @param int $flags Bitfield; supports READ_LATEST [optional]
* @return array
*/
public function getMulti( array $keys, $flags = 0 ) {
$res = [];
foreach ( $keys as $key ) {
$val = $this->get( $key );
if ( $val !== false ) {
$res[$key] = $val;
}
}
return $res;
}
/**
* Batch insertion
* @param array $data $key => $value assoc array
* @param int $exptime Either an interval in seconds or a unix timestamp for expiry
* @return bool Success
* @since 1.24
*/
public function setMulti( array $data, $exptime = 0 ) {
$res = true;
foreach ( $data as $key => $value ) {
if ( !$this->set( $key, $value, $exptime ) ) {
$res = false;
}
}
return $res;
}
/**
* @param string $key
* @param mixed $value
* @param int $exptime
* @return bool Success
*/
public function add( $key, $value, $exptime = 0 ) {
// @note: avoid lock() here since that method uses *this* method by default
if ( $this->get( $key ) === false ) {
return $this->set( $key, $value, $exptime );
}
return false; // key already set
}
/**
* Increase stored value of $key by $value while preserving its TTL
* @param string $key Key to increase
* @param int $value Value to add to $key (Default 1)
* @return int|bool New value or false on failure
*/
public function incr( $key, $value = 1 ) {
if ( !$this->lock( $key, 1 ) ) {
return false;
}
$n = $this->get( $key );
if ( $this->isInteger( $n ) ) { // key exists?
$n += intval( $value );
$this->set( $key, max( 0, $n ) ); // exptime?
} else {
$n = false;
}
$this->unlock( $key );
return $n;
}
/**
* Decrease stored value of $key by $value while preserving its TTL
* @param string $key
* @param int $value
* @return int|bool New value or false on failure
*/
public function decr( $key, $value = 1 ) {
return $this->incr( $key, - $value );
}
/**
* Increase stored value of $key by $value while preserving its TTL
*
* This will create the key with value $init and TTL $ttl instead if not present
*
* @param string $key
* @param int $ttl
* @param int $value
* @param int $init
* @return int|bool New value or false on failure
* @since 1.24
*/
public function incrWithInit( $key, $ttl, $value = 1, $init = 1 ) {
$this->clearLastError();
$newValue = $this->incr( $key, $value );
if ( $newValue === false && !$this->getLastError() ) {
// No key set; initialize
$newValue = $this->add( $key, (int)$init, $ttl ) ? $init : false;
if ( $newValue === false && !$this->getLastError() ) {
// Raced out initializing; increment
$newValue = $this->incr( $key, $value );
}
}
return $newValue;
}
/**
* Get the "last error" registered; clearLastError() should be called manually
* @return int ERR_* constant for the "last error" registry
* @since 1.23
*/
public function getLastError() {
return $this->lastError;
}
/**
* Clear the "last error" registry
* @since 1.23
*/
public function clearLastError() {
$this->lastError = self::ERR_NONE;
}
/**
* Set the "last error" registry
* @param int $err ERR_* constant
* @since 1.23
*/
protected function setLastError( $err ) {
$this->lastError = $err;
}
/**
* Let a callback be run to avoid wasting time on special blocking calls
*
* The callbacks may or may not be called ever, in any particular order.
* They are likely to be invoked when something WRITE_SYNC is used used.
* They should follow a caching pattern as shown below, so that any code
* using the word will get it's result no matter what happens.
* @code
* $result = null;
* $workCallback = function () use ( &$result ) {
* if ( !$result ) {
* $result = ....
* }
* return $result;
* }
* @endcode
*
* @param callable $workCallback
* @since 1.28
*/
public function addBusyCallback( callable $workCallback ) {
$this->busyCallbacks[] = $workCallback;
}
/**
* Modify a cache update operation array for EventRelayer::notify()
*
* This is used for relayed writes, e.g. for broadcasting a change
* to multiple data-centers. If the array contains a 'val' field
* then the command involves setting a key to that value. Note that
* for simplicity, 'val' is always a simple scalar value. This method
* is used to possibly serialize the value and add any cache-specific
* key/values needed for the relayer daemon (e.g. memcached flags).
*
* @param array $event
* @return array
* @since 1.26
*/
public function modifySimpleRelayEvent( array $event ) {
return $event;
}
/**
* @param string $text
*/
protected function debug( $text ) {
if ( $this->debugMode ) {
$this->logger->debug( "{class} debug: $text", [
'class' => static::class,
] );
}
}
/**
* Convert an optionally relative time to an absolute time
* @param int $exptime
* @return int
*/
protected function convertExpiry( $exptime ) {
if ( $exptime != 0 && $exptime < ( 10 * self::TTL_YEAR ) ) {
return (int)$this->getCurrentTime() + $exptime;
} else {
return $exptime;
}
}
/**
* Convert an optionally absolute expiry time to a relative time. If an
* absolute time is specified which is in the past, use a short expiry time.
*
* @param int $exptime
* @return int
*/
protected function convertToRelative( $exptime ) {
if ( $exptime >= ( 10 * self::TTL_YEAR ) ) {
$exptime -= (int)$this->getCurrentTime();
if ( $exptime <= 0 ) {
$exptime = 1;
}
return $exptime;
} else {
return $exptime;
}
}
/**
* Check if a value is an integer
*
* @param mixed $value
* @return bool
*/
protected function isInteger( $value ) {
return ( is_int( $value ) || ctype_digit( $value ) );
}
/**
* Construct a cache key.
*
* @since 1.27
* @param string $keyspace
* @param array $args
* @return string Colon-delimited list of $keyspace followed by escaped components of $args
*/
public function makeKeyInternal( $keyspace, $args ) {
$key = $keyspace;
foreach ( $args as $arg ) {
$arg = str_replace( ':', '%3A', $arg );
$key = $key . ':' . $arg;
}
return strtr( $key, ' ', '_' );
}
/**
* Make a global cache key.
*
* @since 1.27
* @param string $class Key class
* @param string|null $component [optional] Key component (starting with a key collection name)
* @return string Colon-delimited list of $keyspace followed by escaped components of $args
*/
public function makeGlobalKey( $class, $component = null ) {
return $this->makeKeyInternal( 'global', func_get_args() );
}
/**
* Make a cache key, scoped to this instance's keyspace.
*
* @since 1.27
* @param string $class Key class
* @param string|null $component [optional] Key component (starting with a key collection name)
* @return string Colon-delimited list of $keyspace followed by escaped components of $args
*/
public function makeKey( $class, $component = null ) {
return $this->makeKeyInternal( $this->keyspace, func_get_args() );
}
/**
* @param int $flag ATTR_* class constant
* @return int QOS_* class constant
* @since 1.28
*/
public function getQoS( $flag ) {
return $this->attrMap[$flag] ?? self::QOS_UNKNOWN;
}
/**
* Merge the flag maps of one or more BagOStuff objects into a "lowest common denominator" map
*
* @param BagOStuff[] $bags
* @return int[] Resulting flag map (class ATTR_* constant => class QOS_* constant)
*/
protected function mergeFlagMaps( array $bags ) {
$map = [];
foreach ( $bags as $bag ) {
foreach ( $bag->attrMap as $attr => $rank ) {
if ( isset( $map[$attr] ) ) {
$map[$attr] = min( $map[$attr], $rank );
} else {
$map[$attr] = $rank;
}
}
}
return $map;
}
/**
* @return float UNIX timestamp
* @codeCoverageIgnore
*/
protected function getCurrentTime() {
return $this->wallClockOverride ?: microtime( true );
}
/**
* @param float|null &$time Mock UNIX timestamp for testing
* @codeCoverageIgnore
*/
public function setMockTime( &$time ) {
$this->wallClockOverride =& $time;
}
}
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