MediaWiki  REL1_31
MemcachedBagOStuff Class Reference

Base class for memcached clients. More...

Inheritance diagram for MemcachedBagOStuff:
Collaboration diagram for MemcachedBagOStuff:

Public Member Functions

 __construct (array $params)
 $params include: More...
 
 add ( $key, $value, $exptime=0)
 
 changeTTL ( $key, $exptime=0)
 Reset the TTL on a key if it exists. More...
 
 delete ( $key)
 Delete an item. More...
 
 fixExpiry ( $expiry)
 TTLs higher than 30 days will be detected as absolute TTLs (UNIX timestamps), and will result in the cache entry being discarded immediately because the expiry is in the past. More...
 
 getClient ()
 Get the underlying client object. More...
 
 makeKeyInternal ( $keyspace, $args)
 Construct a cache key. More...
 
 merge ( $key, callable $callback, $exptime=0, $attempts=10, $flags=0)
 Merge changes into the existing cache value (possibly creating a new one) More...
 
 modifySimpleRelayEvent (array $event)
 Modify a cache update operation array for EventRelayer::notify() More...
 
 set ( $key, $value, $exptime=0, $flags=0)
 Set an item. More...
 
 validateKeyEncoding ( $key)
 Ensure that a key is safe to use (contains no control characters and no characters above the ASCII range.) More...
 
- Public Member Functions inherited from BagOStuff
 addBusyCallback (callable $workCallback)
 Let a callback be run to avoid wasting time on special blocking calls. More...
 
 clearLastError ()
 Clear the "last error" registry. More...
 
 decr ( $key, $value=1)
 Decrease stored value of $key by $value while preserving its TTL. More...
 
 deleteObjectsExpiringBefore ( $date, $progressCallback=false)
 Delete all objects expiring before a certain date. More...
 
 get ( $key, $flags=0, $oldFlags=null)
 Get an item with the given key. More...
 
 getLastError ()
 Get the "last error" registered; clearLastError() should be called manually. More...
 
 getMulti (array $keys, $flags=0)
 Get an associative array containing the item for each of the keys that have items. More...
 
 getQoS ( $flag)
 
 getScopedLock ( $key, $timeout=6, $expiry=30, $rclass='')
 Get a lightweight exclusive self-unlocking lock. More...
 
 getWithSetCallback ( $key, $ttl, $callback, $flags=0)
 Get an item with the given key, regenerating and setting it if not found. More...
 
 incr ( $key, $value=1)
 Increase stored value of $key by $value while preserving its TTL. More...
 
 incrWithInit ( $key, $ttl, $value=1, $init=1)
 Increase stored value of $key by $value while preserving its TTL. More...
 
 lock ( $key, $timeout=6, $expiry=6, $rclass='')
 Acquire an advisory lock on a key string. More...
 
 makeGlobalKey ( $class, $component=null)
 Make a global cache key. More...
 
 makeKey ( $class, $component=null)
 Make a cache key, scoped to this instance's keyspace. More...
 
 setDebug ( $bool)
 
 setLogger (LoggerInterface $logger)
 
 setMockTime (&$time)
 
 setMulti (array $data, $exptime=0)
 Batch insertion. More...
 
 unlock ( $key)
 Release an advisory lock on a key string. More...
 

Protected Member Functions

 applyDefaultParams ( $params)
 Fill in some defaults for missing keys in $params. More...
 
 cas ( $casToken, $key, $value, $exptime=0)
 Check and set an item. More...
 
 debugLog ( $text)
 Send a debug message to the log. More...
 
 doGet ( $key, $flags=0)
 
 getWithToken ( $key, &$casToken, $flags=0)
 
- Protected Member Functions inherited from BagOStuff
 convertExpiry ( $exptime)
 Convert an optionally relative time to an absolute time. More...
 
 convertToRelative ( $exptime)
 Convert an optionally absolute expiry time to a relative time. More...
 
 debug ( $text)
 
 getCurrentTime ()
 
 isInteger ( $value)
 Check if a value is an integer. More...
 
 mergeFlagMaps (array $bags)
 Merge the flag maps of one or more BagOStuff objects into a "lowest common denominator" map. More...
 
 mergeViaCas ( $key, $callback, $exptime=0, $attempts=10)
 
 mergeViaLock ( $key, $callback, $exptime=0, $attempts=10, $flags=0)
 
 setLastError ( $err)
 Set the "last error" registry. More...
 

Protected Attributes

MemcachedClient Memcached $client
 
- Protected Attributes inherited from BagOStuff
callback null $asyncHandler
 
int[] $attrMap = []
 Map of (ATTR_* class constant => QOS_* class constant) More...
 
callable[] $busyCallbacks = []
 
string $keyspace = 'local'
 
int $lastError = self::ERR_NONE
 ERR_* class constant. More...
 
array[] $locks = []
 Lock tracking. More...
 
LoggerInterface $logger
 
int $syncTimeout
 Seconds. More...
 

Additional Inherited Members

- Public Attributes inherited from BagOStuff
const ERR_NO_RESPONSE = 1
 
const ERR_NONE = 0
 Possible values for getLastError() More...
 
const ERR_UNEXPECTED = 3
 
const ERR_UNREACHABLE = 2
 
const READ_LATEST = 1
 Bitfield constants for get()/getMulti() More...
 
const READ_VERIFIED = 2
 
const WRITE_CACHE_ONLY = 2
 
const WRITE_SYNC = 1
 Bitfield constants for set()/merge() More...
 
- Public Attributes inherited from IExpiringStore
const ATTR_EMULATION = 1
 
const ATTR_SYNCWRITES = 2
 
const QOS_EMULATION_SQL = 1
 
const QOS_SYNCWRITES_BE = 2
 
const QOS_SYNCWRITES_NONE = 1
 
const QOS_SYNCWRITES_QC = 3
 
const QOS_SYNCWRITES_SS = 4
 
const QOS_UNKNOWN = INF
 
const TTL_DAY = 86400
 
const TTL_HOUR = 3600
 
const TTL_INDEFINITE = 0
 
const TTL_MINUTE = 60
 
const TTL_MONTH = 2592000
 
const TTL_PROC_LONG = 30
 
const TTL_PROC_SHORT = 3
 
const TTL_SECOND = 1
 
const TTL_WEEK = 604800
 
const TTL_YEAR = 31536000
 

Detailed Description

Base class for memcached clients.

Definition at line 29 of file MemcachedBagOStuff.php.

Constructor & Destructor Documentation

◆ __construct()

MemcachedBagOStuff::__construct ( array  $params)

$params include:

  • logger: Psr\Log\LoggerInterface instance
  • keyspace: Default keyspace for $this->makeKey()
  • asyncHandler: Callable to use for scheduling tasks after the web request ends. In CLI mode, it should run the task immediately.
  • reportDupes: Whether to emit warning log messages for all keys that were requested more than once (requires an asyncHandler).
  • syncTimeout: How long to wait with WRITE_SYNC in seconds.
    Parameters
    array$params

Reimplemented from BagOStuff.

Definition at line 33 of file MemcachedBagOStuff.php.

References $params, IExpiringStore\ATTR_SYNCWRITES, and IExpiringStore\QOS_SYNCWRITES_BE.

Member Function Documentation

◆ add()

MemcachedBagOStuff::add (   $key,
  $value,
  $exptime = 0 
)
Parameters
string$key
mixed$value
int$exptime
Returns
bool Success

Reimplemented from BagOStuff.

Reimplemented in MemcachedPeclBagOStuff.

Definition at line 77 of file MemcachedBagOStuff.php.

References $value, fixExpiry(), and validateKeyEncoding().

Referenced by MemcLockManager\acquireMutexes().

◆ applyDefaultParams()

MemcachedBagOStuff::applyDefaultParams (   $params)
protected

Fill in some defaults for missing keys in $params.

Parameters
array$params
Returns
array

Reimplemented in MemcachedPeclBagOStuff.

Definition at line 45 of file MemcachedBagOStuff.php.

References $params, and false.

Referenced by MemcachedPhpBagOStuff\__construct().

◆ cas()

MemcachedBagOStuff::cas (   $casToken,
  $key,
  $value,
  $exptime = 0 
)
protected

Check and set an item.

Parameters
mixed$casToken
string$key
mixed$value
int$exptimeEither an interval in seconds or a unix timestamp for expiry
Returns
bool Success
Exceptions
Exception

Reimplemented from BagOStuff.

Reimplemented in MemcachedPeclBagOStuff.

Definition at line 68 of file MemcachedBagOStuff.php.

References $value, fixExpiry(), and validateKeyEncoding().

◆ changeTTL()

MemcachedBagOStuff::changeTTL (   $key,
  $expiry = 0 
)

Reset the TTL on a key if it exists.

Parameters
string$key
int$expiry
Returns
bool Success Returns false if there is no key
Since
1.28

Reimplemented from BagOStuff.

Reimplemented in MemcachedPeclBagOStuff.

Definition at line 86 of file MemcachedBagOStuff.php.

References fixExpiry(), and validateKeyEncoding().

◆ debugLog()

◆ delete()

MemcachedBagOStuff::delete (   $key)

Delete an item.

Parameters
string$key
Returns
bool True if the item was deleted or not found, false on failure

Reimplemented from BagOStuff.

Reimplemented in MemcachedPeclBagOStuff.

Definition at line 73 of file MemcachedBagOStuff.php.

References validateKeyEncoding().

Referenced by MemcLockManager\releaseMutexes().

◆ doGet()

MemcachedBagOStuff::doGet (   $key,
  $flags = 0 
)
protected
Parameters
string$key
int$flagsBitfield of BagOStuff::READ_* constants [optional]
Returns
mixed Returns false on failure and if the item does not exist

Reimplemented from BagOStuff.

Definition at line 53 of file MemcachedBagOStuff.php.

References getWithToken().

◆ fixExpiry()

MemcachedBagOStuff::fixExpiry (   $expiry)

TTLs higher than 30 days will be detected as absolute TTLs (UNIX timestamps), and will result in the cache entry being discarded immediately because the expiry is in the past.

Clamp expires >30d at 30d, unless they're >=1e9 in which case they are likely to really be absolute (1e9 = 2011-09-09)

Parameters
int$expiry
Returns
int

Definition at line 170 of file MemcachedBagOStuff.php.

Referenced by add(), cas(), changeTTL(), set(), and MemcachedPeclBagOStuff\setMulti().

◆ getClient()

MemcachedBagOStuff::getClient ( )

Get the underlying client object.

This is provided for debugging purposes.

Returns
MemcachedClient|Memcached

Definition at line 96 of file MemcachedBagOStuff.php.

References $client.

◆ getWithToken()

MemcachedBagOStuff::getWithToken (   $key,
$casToken,
  $flags = 0 
)
protected
Note
: This method is only needed if merge() uses mergeViaCas()
Parameters
string$key
mixed&$casToken
int$flagsBitfield of BagOStuff::READ_* constants [optional]
Returns
mixed Returns false on failure and if the item does not exist
Exceptions
Exception

Reimplemented from BagOStuff.

Reimplemented in MemcachedPeclBagOStuff.

Definition at line 59 of file MemcachedBagOStuff.php.

References validateKeyEncoding().

Referenced by doGet().

◆ makeKeyInternal()

MemcachedBagOStuff::makeKeyInternal (   $keyspace,
  $args 
)

Construct a cache key.

Since
1.27
Parameters
string$keyspace
array$args
Returns
string

Reimplemented from BagOStuff.

Definition at line 108 of file MemcachedBagOStuff.php.

References $args, BagOStuff\$keyspace, and use.

◆ merge()

MemcachedBagOStuff::merge (   $key,
callable  $callback,
  $exptime = 0,
  $attempts = 10,
  $flags = 0 
)

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.

Parameters
string$key
callable$callbackCallback method to be executed
int$exptimeEither an interval in seconds or a unix timestamp for expiry
int$attemptsThe amount of times to attempt a merge in case of failure
int$flagsBitfield of BagOStuff::WRITE_* constants
Returns
bool Success
Exceptions
InvalidArgumentException

Reimplemented from BagOStuff.

Definition at line 82 of file MemcachedBagOStuff.php.

References BagOStuff\mergeViaCas().

◆ modifySimpleRelayEvent()

MemcachedBagOStuff::modifySimpleRelayEvent ( array  $event)

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).

Parameters
array$event
Returns
array
Since
1.26

Reimplemented from BagOStuff.

Definition at line 185 of file MemcachedBagOStuff.php.

◆ set()

MemcachedBagOStuff::set (   $key,
  $value,
  $exptime = 0,
  $flags = 0 
)

Set an item.

Parameters
string$key
mixed$value
int$exptimeEither an interval in seconds or a unix timestamp for expiry
int$flagsBitfield of BagOStuff::WRITE_* constants
Returns
bool Success

Reimplemented from BagOStuff.

Reimplemented in MemcachedPeclBagOStuff.

Definition at line 63 of file MemcachedBagOStuff.php.

References $value, fixExpiry(), and validateKeyEncoding().

◆ validateKeyEncoding()

MemcachedBagOStuff::validateKeyEncoding (   $key)

Ensure that a key is safe to use (contains no control characters and no characters above the ASCII range.)

Parameters
string$key
Returns
string
Exceptions
Exception

Definition at line 154 of file MemcachedBagOStuff.php.

Referenced by add(), cas(), changeTTL(), MemcachedPhpBagOStuff\decr(), delete(), MemcachedPeclBagOStuff\getMulti(), MemcachedPhpBagOStuff\getMulti(), getWithToken(), MemcachedPeclBagOStuff\getWithToken(), MemcachedPhpBagOStuff\incr(), set(), and MemcachedPeclBagOStuff\setMulti().

Member Data Documentation

◆ $client

MemcachedClient Memcached MemcachedBagOStuff::$client
protected

Definition at line 31 of file MemcachedBagOStuff.php.

Referenced by getClient().


The documentation for this class was generated from the following file: