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MediumSpecificBagOStuff Class Reference

Storage medium specific cache for storing items (e.g. More...

Inheritance diagram for MediumSpecificBagOStuff:
Collaboration diagram for MediumSpecificBagOStuff:

Public Member Functions

 __construct (array $params=[])
 
 add ( $key, $value, $exptime=0, $flags=0)
 Insert an item if it does not already exist. More...
 
 addBusyCallback (callable $workCallback)
 Let a callback be run to avoid wasting time on special blocking calls. More...
 
 changeTTL ( $key, $exptime=0, $flags=0)
 Change the expiration on a key if it exists. More...
 
 changeTTLMulti (array $keys, $exptime, $flags=0)
 Change the expiration of multiple keys that exist. More...
 
 delete ( $key, $flags=0)
 Delete an item. More...
 
 deleteMulti (array $keys, $flags=0)
 Batch deletion. More...
 
 deleteObjectsExpiringBefore ( $timestamp, callable $progress=null, $limit=INF, string $tag=null)
 Delete all objects expiring before a certain date. More...
 
 get ( $key, $flags=0)
 Get an item with the given key. More...
 
 getMulti (array $keys, $flags=0)
 Get an associative array containing the item for each of the keys that have items. More...
 
 getQoS ( $flag)
 
 getSegmentationSize ()
 
 getSegmentedValueMaxSize ()
 
 incrWithInit ( $key, $exptime, $step=1, $init=null, $flags=0)
 Increase the value of the given key (no TTL change) if it exists or create it otherwise. More...
 
 lock ( $key, $timeout=6, $exptime=6, $rclass='')
 
 makeGlobalKey ( $collection,... $components)
 Make a cache key for the default keyspace and given components. More...
 
 makeKey ( $collection,... $components)
 Make a cache key for the global keyspace and given components. More...
 
 merge ( $key, callable $callback, $exptime=0, $attempts=10, $flags=0)
 Merge changes into the existing cache value (possibly creating a new one) More...
 
 set ( $key, $value, $exptime=0, $flags=0)
 Set an item. More...
 
 setMulti (array $valueByKey, $exptime=0, $flags=0)
 Batch insertion/replace. More...
 
 setNewPreparedValues (array $valueByKey)
 Stage a set of new key values for storage and estimate the amount of bytes needed. More...
 
 unlock ( $key)
 Release an advisory lock on a key string. More...
 
- Public Member Functions inherited from BagOStuff
 clearLastError ()
 Clear the "last error" registry. More...
 
 decr ( $key, $value=1, $flags=0)
 Decrease stored value of $key by $value while preserving its TTL. More...
 
 getCurrentTime ()
 
 getLastError ( $watchPoint=0)
 Get the "last error" registry. More...
 
 getLogger ()
 
 getScopedLock ( $key, $timeout=6, $expiry=30, $rclass='')
 Get a lightweight exclusive self-unlocking lock. More...
 
 getWithSetCallback ( $key, $exptime, $callback, $flags=0)
 Get an item with the given key, regenerating and setting it if not found. More...
 
 incr ( $key, $value=1, $flags=0)
 Increase stored value of $key by $value while preserving its TTL. More...
 
 isKeyGlobal ( $key)
 Check whether a cache key is in the global keyspace. More...
 
 makeKeyInternal ( $keyspace, $components)
 Make a cache key for the given keyspace and components. More...
 
 registerWrapperInfoForStats (string $prefixComponent, string $statsGroup, callable $collectionCallback)
 Register info about a caching layer class that uses BagOStuff as a backing store. More...
 
 setLogger (LoggerInterface $logger)
 
 setMockTime (&$time)
 
 watchErrors ()
 Get a "watch point" token that can be used to get the "last error" to occur after now. More...
 

Protected Member Functions

 cas ( $casToken, $key, $value, $exptime=0, $flags=0)
 Set an item if the current CAS token matches the provided CAS token. More...
 
 convertGenericKey ( $key)
 Convert a "generic" reversible cache key into one for this cache. More...
 
 debug ( $text)
 
 doAdd ( $key, $value, $exptime=0, $flags=0)
 Insert an item if it does not already exist. More...
 
 doCas ( $casToken, $key, $value, $exptime=0, $flags=0)
 Set an item if the current CAS token matches the provided CAS token. More...
 
 doChangeTTL ( $key, $exptime, $flags)
 
 doChangeTTLMulti (array $keys, $exptime, $flags=0)
 
 doDelete ( $key, $flags=0)
 Delete an item. More...
 
 doDeleteMulti (array $keys, $flags=0)
 
 doGet ( $key, $flags=0, &$casToken=null)
 Get an item. More...
 
 doGetMulti (array $keys, $flags=0)
 Get an associative array containing the item for each of the keys that have items. More...
 
 doIncrWithInit ( $key, $exptime, $step, $init, $flags)
 
 doLock ( $key, $timeout, $exptime)
 
 doSet ( $key, $value, $exptime=0, $flags=0)
 Set an item. More...
 
 doSetMulti (array $data, $exptime=0, $flags=0)
 
 doUnlock ( $key)
 
 getExpirationAsTimestamp ( $exptime)
 Convert an optionally relative timestamp to an absolute time. More...
 
 getExpirationAsTTL ( $exptime)
 Convert an optionally absolute expiry time to a relative time. More...
 
 getSerialized ( $value, $key)
 Get the serialized form a value, using any applicable prepared value. More...
 
 guessSerialSizeOfValues (array $values)
 Estimate the size of a each variable once serialized. More...
 
 guessSerialValueSize ( $value, $depth=0, &$loops=0)
 Estimate the size of a variable once serialized. More...
 
 isInteger ( $value)
 Check if a value is an integer. More...
 
 isRelativeExpiration ( $exptime)
 
 makeLockKey ( $key)
 
 makeValueOrSegmentList ( $key, $value, $exptime, $flags)
 Determine the entry (inline or segment list) to store under a key to save the value. More...
 
 mergeViaCas ( $key, callable $callback, $exptime, $attempts, $flags)
 
 resolveSegments ( $key, $mainValue)
 Get and reassemble the chunks of blob at the given key. More...
 
 serialize ( $value)
 
 tokensMatch ( $value, $otherValue)
 
 unserialize ( $value)
 
 updateOpStats (string $op, array $keyInfo)
 
- Protected Member Functions inherited from BagOStuff
 componentsFromGenericKey ( $key)
 Extract the components from a "generic" reversible cache key. More...
 
 determineKeyPrefixForStats ( $key)
 
 fieldHasFlags ( $field, $flags)
 
 genericKeyFromComponents (... $components)
 At a minimum, there must be a keyspace and collection name component. More...
 
 mergeFlagMaps (array $bags)
 Merge the flag maps of one or more BagOStuff objects into a "lowest common denominator" map. More...
 
 proxyCall (string $method, int $arg0Sig, int $resSig, array $genericArgs, BagOStuff $wrapper)
 Call a method on behalf of wrapper BagOStuff instance that uses "generic" keys. More...
 
 setLastError ( $error)
 Set the "last error" registry due to a problem encountered during an attempted operation. More...
 

Protected Attributes

array< string, array > $locks = []
 Map of (key => (class, depth, expiry) More...
 
array[] $preparedValues = []
 Map of (key => (PHP variable value, serialized value)) More...
 
int $segmentationSize
 Bytes; chunk size of segmented cache values. More...
 
int $segmentedValueMaxSize
 Bytes; maximum total size of a segmented cache value. More...
 
int $syncTimeout
 Seconds. More...
 
const LOCK_DEPTH = 1
 
const LOCK_EXPIRY = 3
 
const LOCK_RCLASS = 0
 
const LOCK_TIME = 2
 
const METRIC_OP_ADD = 'add'
 
const METRIC_OP_CAS = 'cas'
 
const METRIC_OP_CHANGE_TTL = 'change_ttl'
 
const METRIC_OP_DECR = 'decr'
 
const METRIC_OP_DELETE = 'delete'
 
const METRIC_OP_GET = 'get'
 
const METRIC_OP_INCR = 'incr'
 
const METRIC_OP_SET = 'set'
 
- Protected Attributes inherited from BagOStuff
callable null $asyncHandler
 
int[] $attrMap = []
 Map of (BagOStuff:ATTR_* constant => BagOStuff:QOS_* constant) More...
 
string $keyspace
 Default keyspace; used by makeKey() More...
 
int $lastError = self::ERR_NONE
 BagOStuff:ERR_* constant of the last error that occurred. More...
 
int $lastErrorId = 0
 Error event sequence number of the last error that occurred. More...
 
LoggerInterface $logger
 
StatsdDataFactoryInterface $stats
 
array< string, array > $wrapperInfoByPrefix = []
 Cache key processing callbacks and info for metrics. More...
 

Private Member Functions

 checkIterableMapSerializability ( $value, $key)
 
 checkValueSerializability ( $value, $key)
 Log if a new cache value does not appear suitable for serialization at a quick glance. More...
 
 trackDuplicateKeys ( $key)
 Track the number of times that a given key has been used. More...
 

Private Attributes

bool $dupeTrackScheduled = false
 
array $duplicateKeyLookups = []
 
bool $reportDupes = false
 

Additional Inherited Members

- Public Attributes inherited from BagOStuff
const READ_LATEST = 1
 Bitfield constants for get()/getMulti(); these are only advisory. More...
 
const READ_VERIFIED = 2
 
const WRITE_ALLOW_SEGMENTS = 16
 
const WRITE_BACKGROUND = 64
 
const WRITE_CACHE_ONLY = 8
 
const WRITE_PRUNE_SEGMENTS = 32
 
const WRITE_SYNC = 4
 Bitfield constants for set()/merge(); these are only advisory. More...
 
- Public Attributes inherited from Wikimedia\LightweightObjectStore\StorageAwareness
const ATTR_DURABILITY = 2
 Durability of writes; see QOS_DURABILITY_* (higher means stronger) More...
 
const ATTR_EMULATION = 1
 Emulation/fallback mode; see QOS_EMULATION_*; higher is better. More...
 
const ERR_NO_RESPONSE = 1
 Storage medium failed to yield a complete response to an operation. More...
 
const ERR_NONE = 0
 No storage medium error. More...
 
const ERR_UNEXPECTED = 3
 Storage medium operation failed due to usage limitations or an I/O error. More...
 
const ERR_UNREACHABLE = 2
 Storage medium could not be reached to establish a connection. More...
 
const QOS_DURABILITY_DISK = 4
 Data is saved to disk and writes do not usually block on fsync() More...
 
const QOS_DURABILITY_NONE = 1
 Data is never saved to begin with (blackhole store) More...
 
const QOS_DURABILITY_RDBMS = 5
 Data is saved to disk and writes usually block on fsync(), like a standard RDBMS. More...
 
const QOS_DURABILITY_SCRIPT = 2
 Data is lost at the end of the current web request or CLI script. More...
 
const QOS_DURABILITY_SERVICE = 3
 Data is lost once the service storing the data restarts. More...
 
const QOS_EMULATION_SQL = 1
 Fallback disk-based SQL store. More...
 
const QOS_UNKNOWN = INF
 Generic "unknown" value; useful for comparisons (always "good enough") More...
 
- Static Protected Attributes inherited from BagOStuff
static int $nextErrorMonitorId = 1
 Next sequence number to use for watch/error events. More...
 

Detailed Description

Storage medium specific cache for storing items (e.g.

redis, memcached, ...)

This should not be used for proxy classes that simply wrap other cache instances

Since
1.34

Definition at line 34 of file MediumSpecificBagOStuff.php.

Constructor & Destructor Documentation

◆ __construct()

MediumSpecificBagOStuff::__construct ( array  $params = [])
See also
BagOStuff::__construct() Additional $params options include:
  • logger: Psr\Log\LoggerInterface instance
  • reportDupes: Whether to emit warning log messages for all keys that were requested more than once (requires an asyncHandler).
  • syncTimeout: How long to wait with WRITE_SYNC in seconds.
  • segmentationSize: The chunk size, in bytes, of segmented values. The value should not exceed the maximum size of values in the storage backend, as configured by the site administrator.
  • segmentedValueMaxSize: The maximum total size, in bytes, of segmented values. This should be configured to a reasonable size give the site traffic and the amount of I/O between application and cache servers that the network can handle.
Parameters
array$params@phpcs:ignore Generic.Files.LineLength

Reimplemented from BagOStuff.

Reimplemented in WinCacheBagOStuff, EmptyBagOStuff, APCUBagOStuff, and MemcachedBagOStuff.

Definition at line 91 of file MediumSpecificBagOStuff.php.

Member Function Documentation

◆ add()

MediumSpecificBagOStuff::add (   $key,
  $value,
  $exptime = 0,
  $flags = 0 
)

Insert an item if it does not already exist.

Parameters
string$key
mixed$value
int$exptime
int$flagsBitfield of BagOStuff::WRITE_* constants (since 1.33)
Returns
bool Success

Reimplemented from BagOStuff.

Definition at line 240 of file MediumSpecificBagOStuff.php.

Referenced by MemcLockManager\acquireMutexes().

◆ addBusyCallback()

MediumSpecificBagOStuff::addBusyCallback ( callable  $workCallback)
final

Let a callback be run to avoid wasting time on special blocking calls.

This is hard-deprecated and non-functional since 1.39. The callback will not be called.

Parameters
callable$workCallback
Since
1.28
Deprecated:
since 1.39

Reimplemented from BagOStuff.

Definition at line 837 of file MediumSpecificBagOStuff.php.

References wfDeprecated().

◆ cas()

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

Set an item if the current CAS token matches the provided CAS token.

Parameters
mixed$casTokenOnly set the item if it still has this CAS token
string$key
mixed$value
int$exptimeEither an interval in seconds or a unix timestamp for expiry
int$flagsBitfield of BagOStuff::WRITE_* constants
Returns
bool Success

Definition at line 352 of file MediumSpecificBagOStuff.php.

◆ changeTTL()

MediumSpecificBagOStuff::changeTTL (   $key,
  $exptime = 0,
  $flags = 0 
)

Change the expiration on a key if it exists.

If an expiry in the past is given then the key will immediately be expired

For large values written using WRITE_ALLOW_SEGMENTS, this only changes the TTL of the main segment list key. While lowering the TTL of the segment list key has the effect of functionally lowering the TTL of the key, it might leave unused blobs in cache for longer. Raising the TTL of such keys is not effective, since the expiration of a single segment key effectively expires the entire value.

Parameters
string$key
int$exptimeTTL or UNIX timestamp
int$flagsBitfield of BagOStuff::WRITE_* constants (since 1.33)
Returns
bool Success Returns false on failure or if the item does not exist
Since
1.28

Reimplemented from BagOStuff.

Definition at line 449 of file MediumSpecificBagOStuff.php.

◆ changeTTLMulti()

MediumSpecificBagOStuff::changeTTLMulti ( array  $keys,
  $exptime,
  $flags = 0 
)

Change the expiration of multiple keys that exist.

Parameters
string[]$keysList of keys
int$exptimeTTL or UNIX timestamp
int$flagsBitfield of BagOStuff::WRITE_* constants (since 1.33)
Returns
bool Success
Since
1.34

Reimplemented from BagOStuff.

Definition at line 780 of file MediumSpecificBagOStuff.php.

References $keys.

◆ checkIterableMapSerializability()

MediumSpecificBagOStuff::checkIterableMapSerializability (   $value,
  $key 
)
private
Parameters
array | stdClass$valueResult of the value generation callback for the key
string$keyCache key

Definition at line 1126 of file MediumSpecificBagOStuff.php.

◆ checkValueSerializability()

MediumSpecificBagOStuff::checkValueSerializability (   $value,
  $key 
)
private

Log if a new cache value does not appear suitable for serialization at a quick glance.

This aids migration of values to JSON-like structures and the debugging of exceptions due to serialization failure.

This does not recurse more than one level into container structures.

A proper cache key value is one of the following:

  • null
  • a scalar
  • an array with scalar/null values
  • an array tree with scalar/null "leaf" values
  • an stdClass instance with scalar/null field values
  • an stdClass instance tree with scalar/null "leaf" values
  • an instance of a class that implements JsonSerializable
Parameters
mixed$valueResult of the value generation callback for the key
string$keyCache key

Definition at line 1106 of file MediumSpecificBagOStuff.php.

◆ convertGenericKey()

MediumSpecificBagOStuff::convertGenericKey (   $key)
protected

Convert a "generic" reversible cache key into one for this cache.

See also
BagOStuff::genericKeyFromComponents()
Parameters
string$keyKeyspace-prepended list of encoded components as a colon-separated value
Returns
string Keyspace-prepended list of encoded components as a colon-separated value

Reimplemented from BagOStuff.

Reimplemented in RESTBagOStuff, RedisBagOStuff, HashBagOStuff, EmptyBagOStuff, and APCUBagOStuff.

Definition at line 977 of file MediumSpecificBagOStuff.php.

◆ debug()

◆ delete()

MediumSpecificBagOStuff::delete (   $key,
  $flags = 0 
)

Delete an item.

For large values written using WRITE_ALLOW_SEGMENTS, this only deletes the main segment list key unless WRITE_PRUNE_SEGMENTS is in the flags. While deleting the segment list key has the effect of functionally deleting the key, it leaves unused blobs in cache.

Parameters
string$key
int$flagsBitfield of BagOStuff::WRITE_* constants
Returns
bool True if the item was deleted or not found, false on failure

Reimplemented from BagOStuff.

Definition at line 206 of file MediumSpecificBagOStuff.php.

References doDelete(), doGet(), BagOStuff\fieldHasFlags(), SerializedValueContainer\isSegmented(), makeGlobalKey(), and SerializedValueContainer\SEGMENTED_HASHES.

Referenced by MemcLockManager\releaseMutexes().

◆ deleteMulti()

MediumSpecificBagOStuff::deleteMulti ( array  $keys,
  $flags = 0 
)

Batch deletion.

This does not support WRITE_ALLOW_SEGMENTS to avoid excessive read I/O

Parameters
string[]$keysList of keys
int$flagsBitfield of BagOStuff::WRITE_* constants
Returns
bool Success
Since
1.33

Reimplemented from BagOStuff.

Definition at line 749 of file MediumSpecificBagOStuff.php.

References $keys.

◆ deleteObjectsExpiringBefore()

MediumSpecificBagOStuff::deleteObjectsExpiringBefore (   $timestamp,
callable  $progress = null,
  $limit = INF,
string  $tag = null 
)

Delete all objects expiring before a certain date.

Parameters
string | int$timestampThe reference date in MW or TS_UNIX format
callable | null$progressOptional, a function which will be called regularly during long-running operations with the percentage progress as the first parameter. [optional]
int | float$limitMaximum number of keys to delete [default: INF]
string | null$tagTag to purge a single shard only. This is only supported when server tags are used in configuration.
Returns
bool Success; false if unimplemented

Reimplemented from BagOStuff.

Reimplemented in SqlBagOStuff.

Definition at line 654 of file MediumSpecificBagOStuff.php.

◆ doAdd()

MediumSpecificBagOStuff::doAdd (   $key,
  $value,
  $exptime = 0,
  $flags = 0 
)
abstractprotected

Insert an item if it does not already exist.

Parameters
string$key
mixed$value
int$exptime
int$flagsBitfield of BagOStuff::WRITE_* constants (since 1.33)
Returns
bool Success

Reimplemented in SqlBagOStuff, WinCacheBagOStuff, RESTBagOStuff, MemcachedPhpBagOStuff, MemcachedPeclBagOStuff, HashBagOStuff, EmptyBagOStuff, APCUBagOStuff, and RedisBagOStuff.

◆ doCas()

MediumSpecificBagOStuff::doCas (   $casToken,
  $key,
  $value,
  $exptime = 0,
  $flags = 0 
)
protected

Set an item if the current CAS token matches the provided CAS token.

Parameters
mixed$casTokenCAS token from an existing version of the key
string$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 in SqlBagOStuff, WinCacheBagOStuff, MemcachedPhpBagOStuff, and MemcachedPeclBagOStuff.

Definition at line 378 of file MediumSpecificBagOStuff.php.

References $success.

◆ doChangeTTL()

MediumSpecificBagOStuff::doChangeTTL (   $key,
  $exptime,
  $flags 
)
protected
Parameters
string$key
int$exptime
int$flags
Returns
bool

Reimplemented in SqlBagOStuff, RedisBagOStuff, MemcachedPhpBagOStuff, and MemcachedPeclBagOStuff.

Definition at line 459 of file MediumSpecificBagOStuff.php.

References $blob.

◆ doChangeTTLMulti()

MediumSpecificBagOStuff::doChangeTTLMulti ( array  $keys,
  $exptime,
  $flags = 0 
)
protected
Parameters
string[]$keysList of keys
int$exptimeTTL or UNIX timestamp
int$flagsBitfield of BagOStuff::WRITE_* constants
Returns
bool Success

Reimplemented in SqlBagOStuff, and RedisBagOStuff.

Definition at line 790 of file MediumSpecificBagOStuff.php.

References $keys, and $res.

◆ doDelete()

MediumSpecificBagOStuff::doDelete (   $key,
  $flags = 0 
)
abstractprotected

Delete an item.

Parameters
string$key
int$flagsBitfield of BagOStuff::WRITE_* constants
Returns
bool True if the item was deleted or not found, false on failure

Reimplemented in SqlBagOStuff, WinCacheBagOStuff, RESTBagOStuff, RedisBagOStuff, MemcachedPhpBagOStuff, MemcachedPeclBagOStuff, HashBagOStuff, EmptyBagOStuff, and APCUBagOStuff.

Referenced by delete().

◆ doDeleteMulti()

MediumSpecificBagOStuff::doDeleteMulti ( array  $keys,
  $flags = 0 
)
protected
Parameters
string[]$keysList of keys
int$flagsBitfield of BagOStuff::WRITE_* constants
Returns
bool Success

Reimplemented in SqlBagOStuff, RedisBagOStuff, and MemcachedPeclBagOStuff.

Definition at line 762 of file MediumSpecificBagOStuff.php.

References $keys, and $res.

◆ doGet()

MediumSpecificBagOStuff::doGet (   $key,
  $flags = 0,
$casToken = null 
)
abstractprotected

Get an item.

The CAS token should be null if the key does not exist or the value is corrupt

Parameters
string$key
int$flagsBitfield of BagOStuff::READ_* constants [optional]
mixed&$casTokenCAS token if MediumSpecificBagOStuff::PASS_BY_REF [returned]
Returns
mixed Returns false on failure or if the item does not exist

Reimplemented in SqlBagOStuff, WinCacheBagOStuff, RESTBagOStuff, RedisBagOStuff, MemcachedPhpBagOStuff, MemcachedPeclBagOStuff, HashBagOStuff, EmptyBagOStuff, and APCUBagOStuff.

Referenced by delete(), and get().

◆ doGetMulti()

MediumSpecificBagOStuff::doGetMulti ( array  $keys,
  $flags = 0 
)
protected

Get an associative array containing the item for each of the keys that have items.

Parameters
string[]$keysList of keys
int$flagsBitfield; supports READ_LATEST [optional]
Returns
array Map of (key => value) for existing keys; preserves the order of $keys

Reimplemented in SqlBagOStuff, RedisBagOStuff, MemcachedPhpBagOStuff, and MemcachedPeclBagOStuff.

Definition at line 693 of file MediumSpecificBagOStuff.php.

References $keys, and $res.

◆ doIncrWithInit()

MediumSpecificBagOStuff::doIncrWithInit (   $key,
  $exptime,
  $step,
  $init,
  $flags 
)
abstractprotected
Parameters
string$key
int$exptime
int$step
int$init
int$flags
Returns
int|bool New value or false on failure

Reimplemented in SqlBagOStuff, WinCacheBagOStuff, RESTBagOStuff, RedisBagOStuff, MemcachedBagOStuff, HashBagOStuff, EmptyBagOStuff, and APCUBagOStuff.

◆ doLock()

MediumSpecificBagOStuff::doLock (   $key,
  $timeout,
  $exptime 
)
protected
See also
MediumSpecificBagOStuff::lock()
Parameters
string$key
int$timeoutLock wait timeout; 0 for non-blocking [optional]
int$exptimeLock time-to-live 1 day maximum [optional]
Returns
float|null UNIX timestamp of acquisition; null on failure

Reimplemented in SqlBagOStuff.

Definition at line 545 of file MediumSpecificBagOStuff.php.

◆ doSet()

MediumSpecificBagOStuff::doSet (   $key,
  $value,
  $exptime = 0,
  $flags = 0 
)
abstractprotected

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 in SqlBagOStuff, WinCacheBagOStuff, RESTBagOStuff, RedisBagOStuff, MemcachedPhpBagOStuff, MemcachedPeclBagOStuff, HashBagOStuff, EmptyBagOStuff, and APCUBagOStuff.

Referenced by set().

◆ doSetMulti()

MediumSpecificBagOStuff::doSetMulti ( array  $data,
  $exptime = 0,
  $flags = 0 
)
protected
Parameters
mixed[]$dataMap of (key => value)
int$exptimeEither an interval in seconds or a unix timestamp for expiry
int$flagsBitfield of BagOStuff::WRITE_* constants
Returns
bool Success

Reimplemented in SqlBagOStuff, RedisBagOStuff, and MemcachedPeclBagOStuff.

Definition at line 730 of file MediumSpecificBagOStuff.php.

References $res.

◆ doUnlock()

MediumSpecificBagOStuff::doUnlock (   $key)
protected
See also
MediumSpecificBagOStuff::unlock()
Parameters
string$key
Returns
bool Success

Reimplemented in SqlBagOStuff.

Definition at line 621 of file MediumSpecificBagOStuff.php.

◆ get()

MediumSpecificBagOStuff::get (   $key,
  $flags = 0 
)

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.

Parameters
string$key
int$flagsBitfield of BagOStuff::READ_* constants [optional]
Returns
mixed Returns false on failure or if the item does not exist

Reimplemented from BagOStuff.

Definition at line 118 of file MediumSpecificBagOStuff.php.

References doGet(), resolveSegments(), and trackDuplicateKeys().

◆ getExpirationAsTimestamp()

MediumSpecificBagOStuff::getExpirationAsTimestamp (   $exptime)
finalprotected

Convert an optionally relative timestamp to an absolute time.

The input value will be cast to an integer and interpreted as follows:

  • zero: no expiry; return zero (e.g. TTL_INDEFINITE)
  • negative: relative TTL; return UNIX timestamp offset by this value
  • positive (< 10 years): relative TTL; return UNIX timestamp offset by this value
  • positive (>= 10 years): absolute UNIX timestamp; return this value
Parameters
int$exptime
Returns
int Expiration timestamp or TTL_INDEFINITE for indefinite
Since
1.34

Definition at line 917 of file MediumSpecificBagOStuff.php.

Referenced by RedisBagOStuff\doChangeTTL(), RedisBagOStuff\doChangeTTLMulti(), HashBagOStuff\doSet(), and SqlBagOStuff\makeNewKeyExpiry().

◆ getExpirationAsTTL()

MediumSpecificBagOStuff::getExpirationAsTTL (   $exptime)
finalprotected

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.

The input value will be cast to an integer and interpreted as follows:

  • zero: no expiry; return zero (e.g. TTL_INDEFINITE)
  • negative: relative TTL; return a short expiry time (1 second)
  • positive (< 10 years): relative TTL; return this value
  • positive (>= 10 years): absolute UNIX timestamp; return offset to current time
Parameters
int$exptime
Returns
int Relative TTL or TTL_INDEFINITE for indefinite
Since
1.34

Definition at line 941 of file MediumSpecificBagOStuff.php.

Referenced by RedisBagOStuff\doAdd(), APCUBagOStuff\doAdd(), WinCacheBagOStuff\doAdd(), RedisBagOStuff\doChangeTTL(), RedisBagOStuff\doChangeTTLMulti(), APCUBagOStuff\doIncrWithInit(), RedisBagOStuff\doIncrWithInit(), APCUBagOStuff\doSet(), RedisBagOStuff\doSet(), WinCacheBagOStuff\doSet(), and RedisBagOStuff\doSetMulti().

◆ getMulti()

MediumSpecificBagOStuff::getMulti ( array  $keys,
  $flags = 0 
)

Get an associative array containing the item for each of the keys that have items.

Parameters
string[]$keysList of keys; can be a map of (unused => key) for convenience
int$flagsBitfield; supports READ_LATEST [optional]
Returns
mixed[] Map of (key => value) for existing keys; preserves the order of $keys

Reimplemented from BagOStuff.

Definition at line 669 of file MediumSpecificBagOStuff.php.

References $keys, and $res.

◆ getQoS()

MediumSpecificBagOStuff::getQoS (   $flag)
Parameters
int$flagBagOStuff::ATTR_* constant
Returns
int BagOStuff:QOS_* constant
Since
1.28

Reimplemented from BagOStuff.

Definition at line 989 of file MediumSpecificBagOStuff.php.

◆ getSegmentationSize()

MediumSpecificBagOStuff::getSegmentationSize ( )
Returns
int|float The chunk size, in bytes, of segmented objects (INF for no limit)
Since
1.34

Reimplemented from BagOStuff.

Definition at line 993 of file MediumSpecificBagOStuff.php.

◆ getSegmentedValueMaxSize()

MediumSpecificBagOStuff::getSegmentedValueMaxSize ( )
Returns
int|float Maximum total segmented object size in bytes (INF for no limit)
Since
1.34

Reimplemented from BagOStuff.

Definition at line 997 of file MediumSpecificBagOStuff.php.

◆ getSerialized()

MediumSpecificBagOStuff::getSerialized (   $value,
  $key 
)
protected

Get the serialized form a value, using any applicable prepared value.

See also
BagOStuff::setNewPreparedValues()
Parameters
mixed$value
string$key
Returns
string|int String/integer representation
Since
1.35

Definition at line 1031 of file MediumSpecificBagOStuff.php.

References serialize().

Referenced by RedisBagOStuff\doAdd(), APCUBagOStuff\doAdd(), WinCacheBagOStuff\doAdd(), APCUBagOStuff\doSet(), RedisBagOStuff\doSet(), WinCacheBagOStuff\doSet(), RedisBagOStuff\doSetMulti(), SqlBagOStuff\modifyTableSpecificBlobsForAdd(), SqlBagOStuff\modifyTableSpecificBlobsForCas(), and SqlBagOStuff\modifyTableSpecificBlobsForSet().

◆ guessSerialSizeOfValues()

MediumSpecificBagOStuff::guessSerialSizeOfValues ( array  $values)
protected

Estimate the size of a each variable once serialized.

Parameters
array$valuesList/map with PHP variable values to serialize
Returns
int[]|null[] Corresponding list of size estimates (null for invalid values)
Since
1.39

Definition at line 1077 of file MediumSpecificBagOStuff.php.

Referenced by APCUBagOStuff\setNewPreparedValues(), EmptyBagOStuff\setNewPreparedValues(), HashBagOStuff\setNewPreparedValues(), and MemcachedPeclBagOStuff\setNewPreparedValues().

◆ guessSerialValueSize()

MediumSpecificBagOStuff::guessSerialValueSize (   $value,
  $depth = 0,
$loops = 0 
)
protected

Estimate the size of a variable once serialized.

Parameters
mixed$value
int$depthCurrent stack depth
int&$loopsNumber of iterable nodes visited
Returns
int|null Size in bytes; null for unsupported variable types
Since
1.35

Definition at line 1061 of file MediumSpecificBagOStuff.php.

References serialize().

◆ incrWithInit()

MediumSpecificBagOStuff::incrWithInit (   $key,
  $exptime,
  $step = 1,
  $init = null,
  $flags = 0 
)

Increase the value of the given key (no TTL change) if it exists or create it otherwise.

This will create the key with the value $init and TTL $exptime instead if not present. Callers should make sure that both ($init - $step) and $exptime are invariants for all operations to any given key. The value of $init should be at least that of $step.

The new value is returned, except if the WRITE_BACKGROUND flag is given, in which case the handler may choose to return true to indicate that the operation has been dispatched.

Parameters
string$keyKey built via makeKey() or makeGlobalKey()
int$exptimeTime-to-live (in seconds) or a UNIX timestamp expiration
int$stepAmount to increase the key value by [default: 1]
int | null$initValue to initialize the key to if it does not exist [default: $step]
int$flagsBit field of class WRITE_* constants [optional]
Returns
int|bool New value or false on failure or true for an asynchronous update.
Since
1.24

Reimplemented from BagOStuff.

Definition at line 485 of file MediumSpecificBagOStuff.php.

◆ isInteger()

◆ isRelativeExpiration()

MediumSpecificBagOStuff::isRelativeExpiration (   $exptime)
finalprotected
Parameters
int | float$exptime
Returns
bool Whether the expiry is non-infinite, and, negative or not a UNIX timestamp
Since
1.34

Definition at line 900 of file MediumSpecificBagOStuff.php.

Referenced by RedisBagOStuff\doChangeTTL(), RedisBagOStuff\doChangeTTLMulti(), and MemcachedBagOStuff\fixExpiry().

◆ lock()

MediumSpecificBagOStuff::lock (   $key,
  $timeout = 6,
  $exptime = 6,
  $rclass = '' 
)
Parameters
string$key
int$timeout
int$exptime
string$rclass
Returns
bool

Reimplemented from BagOStuff.

Definition at line 509 of file MediumSpecificBagOStuff.php.

Referenced by SqlBagOStuff\newLockingWriteSectionModificationTimestamp().

◆ makeGlobalKey()

MediumSpecificBagOStuff::makeGlobalKey (   $collection,
  $components 
)

Make a cache key for the default keyspace and given components.

See also
IStoreKeyEncoder::makeGlobalKey()
Parameters
string$collectionKey collection name component
string|int...$components Additional, ordered, key components for entity IDs
Returns
string Colon-separated, keyspace-prepended, ordered list of encoded components
Since
1.27

Reimplemented from BagOStuff.

Definition at line 969 of file MediumSpecificBagOStuff.php.

Referenced by delete().

◆ makeKey()

MediumSpecificBagOStuff::makeKey (   $collection,
  $components 
)

Make a cache key for the global keyspace and given components.

See also
IStoreKeyEncoder::makeKey()
Parameters
string$collectionKey collection name component
string|int...$components Additional, ordered, key components for entity IDs
Returns
string Colon-separated, keyspace-prepended, ordered list of encoded components
Since
1.27

Reimplemented from BagOStuff.

Definition at line 973 of file MediumSpecificBagOStuff.php.

◆ makeLockKey()

MediumSpecificBagOStuff::makeLockKey (   $key)
protected
Parameters
string$key
Returns
string

Definition at line 650 of file MediumSpecificBagOStuff.php.

◆ makeValueOrSegmentList()

MediumSpecificBagOStuff::makeValueOrSegmentList (   $key,
  $value,
  $exptime,
  $flags 
)
finalprotected

Determine the entry (inline or segment list) to store under a key to save the value.

Parameters
string$key
mixed$value
int$exptime
int$flags
Returns
array (inline value or segment list, whether the entry is usable)
Since
1.34

Definition at line 851 of file MediumSpecificBagOStuff.php.

References $serialized, SerializedValueContainer\newSegmented(), and SerializedValueContainer\newUnified().

Referenced by set().

◆ merge()

MediumSpecificBagOStuff::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 overridden in the callback. Nothing is stored nor deleted if the callback returns false.

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

Reimplemented from BagOStuff.

Reimplemented in EmptyBagOStuff.

Definition at line 273 of file MediumSpecificBagOStuff.php.

◆ mergeViaCas()

MediumSpecificBagOStuff::mergeViaCas (   $key,
callable  $callback,
  $exptime,
  $attempts,
  $flags 
)
finalprotected
Parameters
string$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
See also
BagOStuff::merge()

Definition at line 286 of file MediumSpecificBagOStuff.php.

References $success.

◆ resolveSegments()

MediumSpecificBagOStuff::resolveSegments (   $key,
  $mainValue 
)
finalprotected

Get and reassemble the chunks of blob at the given key.

Parameters
string$key
mixed$mainValue
Returns
string|null|bool The combined string, false if missing, null on error

Definition at line 806 of file MediumSpecificBagOStuff.php.

References SerializedValueContainer\isUnified(), SerializedValueContainer\UNIFIED_DATA, and unserialize().

Referenced by get().

◆ serialize()

MediumSpecificBagOStuff::serialize (   $value)
protected
Parameters
mixed$value
Returns
string|int|false String/integer representation
Note
Special handling is usually needed for integers so incr()/decr() work

Reimplemented in SqlBagOStuff, MemcachedPhpBagOStuff, and MemcachedPeclBagOStuff.

Definition at line 1150 of file MediumSpecificBagOStuff.php.

References serialize().

Referenced by RESTBagOStuff\encodeBody().

◆ set()

MediumSpecificBagOStuff::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.

Definition at line 178 of file MediumSpecificBagOStuff.php.

References doSet(), and makeValueOrSegmentList().

◆ setMulti()

MediumSpecificBagOStuff::setMulti ( array  $valueByKey,
  $exptime = 0,
  $flags = 0 
)

Batch insertion/replace.

This does not support WRITE_ALLOW_SEGMENTS to avoid excessive read I/O

Parameters
mixed[]$valueByKeyMap of (key => value)
int$exptimeEither an interval in seconds or a unix timestamp for expiry
int$flagsBitfield of BagOStuff::WRITE_* constants (since 1.33)
Returns
bool Success
Since
1.24

Reimplemented from BagOStuff.

Definition at line 716 of file MediumSpecificBagOStuff.php.

◆ setNewPreparedValues()

MediumSpecificBagOStuff::setNewPreparedValues ( array  $valueByKey)

Stage a set of new key values for storage and estimate the amount of bytes needed.

All previously prepared values will be cleared. Each of the new prepared values will be individually cleared as they get used by write operations for that key. This is done to avoid unchecked growth in PHP memory usage.

Example usage:

$valueByKey = [ $key1 => $value1, $key2 => $value2, $key3 => $value3 ];
$cache->setNewPreparedValues( $valueByKey );
$cache->set( $key1, $value1, $cache::TTL_HOUR );
$cache->setMulti( [ $key2 => $value2, $key3 => $value3 ], $cache::TTL_HOUR );
$cache
Definition: mcc.php:33

This is only useful if the caller needs an estimate of the serialized object sizes, such as cache wrappers with adaptive write slam avoidance or store wrappers with metrics. The caller cannot know the serialization format and even if it did, it could be expensive to serialize complex values twice just to get the size information before writing them to cache. This method solves both problems by making the cache instance do the serialization and having it reuse the result when the cache write happens.

Parameters
array$valueByKeyMap of (cache key => PHP variable value to serialize)
Returns
int[]|null[] Corresponding list of size estimates (null for invalid values)
Since
1.35

Reimplemented from BagOStuff.

Reimplemented in MemcachedPeclBagOStuff, HashBagOStuff, EmptyBagOStuff, and APCUBagOStuff.

Definition at line 1001 of file MediumSpecificBagOStuff.php.

References $serialized, and serialize().

◆ tokensMatch()

MediumSpecificBagOStuff::tokensMatch (   $value,
  $otherValue 
)
finalprotected
Parameters
mixed$valueCAS token for an existing key
mixed$otherValueCAS token for an existing key
Returns
bool Whether the two tokens match

Definition at line 416 of file MediumSpecificBagOStuff.php.

References $type, and serialize().

◆ trackDuplicateKeys()

MediumSpecificBagOStuff::trackDuplicateKeys (   $key)
private

Track the number of times that a given key has been used.

Parameters
string$key

Definition at line 128 of file MediumSpecificBagOStuff.php.

Referenced by get().

◆ unlock()

MediumSpecificBagOStuff::unlock (   $key)

Release an advisory lock on a key string.

Parameters
string$key
Returns
bool Success

Reimplemented from BagOStuff.

Definition at line 589 of file MediumSpecificBagOStuff.php.

Referenced by SqlBagOStuff\newLockingWriteSectionModificationTimestamp().

◆ unserialize()

MediumSpecificBagOStuff::unserialize (   $value)
protected
Parameters
string | int | false$value
Returns
mixed Original value or false on error
Note
Special handling is usually needed for integers so incr()/decr() work

Reimplemented in SqlBagOStuff, MemcachedPhpBagOStuff, and MemcachedPeclBagOStuff.

Definition at line 1159 of file MediumSpecificBagOStuff.php.

References unserialize().

Referenced by RESTBagOStuff\decodeBody(), APCUBagOStuff\doGet(), RedisBagOStuff\doGet(), WinCacheBagOStuff\doGet(), and RedisBagOStuff\doGetMulti().

◆ updateOpStats()

MediumSpecificBagOStuff::updateOpStats ( string  $op,
array  $keyInfo 
)
protected

Member Data Documentation

◆ $dupeTrackScheduled

bool MediumSpecificBagOStuff::$dupeTrackScheduled = false
private

Definition at line 49 of file MediumSpecificBagOStuff.php.

◆ $duplicateKeyLookups

array MediumSpecificBagOStuff::$duplicateKeyLookups = []
private

Definition at line 45 of file MediumSpecificBagOStuff.php.

◆ $locks

array<string,array> MediumSpecificBagOStuff::$locks = []
protected

Map of (key => (class, depth, expiry)

Definition at line 36 of file MediumSpecificBagOStuff.php.

◆ $preparedValues

array [] MediumSpecificBagOStuff::$preparedValues = []
protected

Map of (key => (PHP variable value, serialized value))

Definition at line 52 of file MediumSpecificBagOStuff.php.

◆ $reportDupes

bool MediumSpecificBagOStuff::$reportDupes = false
private

Definition at line 47 of file MediumSpecificBagOStuff.php.

◆ $segmentationSize

int MediumSpecificBagOStuff::$segmentationSize
protected

Bytes; chunk size of segmented cache values.

Definition at line 40 of file MediumSpecificBagOStuff.php.

◆ $segmentedValueMaxSize

int MediumSpecificBagOStuff::$segmentedValueMaxSize
protected

Bytes; maximum total size of a segmented cache value.

Definition at line 42 of file MediumSpecificBagOStuff.php.

◆ $syncTimeout

int MediumSpecificBagOStuff::$syncTimeout
protected

Seconds.

Definition at line 38 of file MediumSpecificBagOStuff.php.

◆ LOCK_DEPTH

const MediumSpecificBagOStuff::LOCK_DEPTH = 1
protected

Definition at line 70 of file MediumSpecificBagOStuff.php.

◆ LOCK_EXPIRY

const MediumSpecificBagOStuff::LOCK_EXPIRY = 3
protected

Definition at line 72 of file MediumSpecificBagOStuff.php.

◆ LOCK_RCLASS

const MediumSpecificBagOStuff::LOCK_RCLASS = 0
protected

Definition at line 69 of file MediumSpecificBagOStuff.php.

◆ LOCK_TIME

const MediumSpecificBagOStuff::LOCK_TIME = 2
protected

Definition at line 71 of file MediumSpecificBagOStuff.php.

◆ METRIC_OP_ADD

const MediumSpecificBagOStuff::METRIC_OP_ADD = 'add'
protected

Definition at line 64 of file MediumSpecificBagOStuff.php.

◆ METRIC_OP_CAS

const MediumSpecificBagOStuff::METRIC_OP_CAS = 'cas'
protected

Definition at line 67 of file MediumSpecificBagOStuff.php.

◆ METRIC_OP_CHANGE_TTL

const MediumSpecificBagOStuff::METRIC_OP_CHANGE_TTL = 'change_ttl'
protected

Definition at line 63 of file MediumSpecificBagOStuff.php.

◆ METRIC_OP_DECR

const MediumSpecificBagOStuff::METRIC_OP_DECR = 'decr'
protected

Definition at line 66 of file MediumSpecificBagOStuff.php.

◆ METRIC_OP_DELETE

const MediumSpecificBagOStuff::METRIC_OP_DELETE = 'delete'
protected

Definition at line 62 of file MediumSpecificBagOStuff.php.

◆ METRIC_OP_GET

const MediumSpecificBagOStuff::METRIC_OP_GET = 'get'
protected

Definition at line 60 of file MediumSpecificBagOStuff.php.

◆ METRIC_OP_INCR

const MediumSpecificBagOStuff::METRIC_OP_INCR = 'incr'
protected

Definition at line 65 of file MediumSpecificBagOStuff.php.

◆ METRIC_OP_SET

const MediumSpecificBagOStuff::METRIC_OP_SET = 'set'
protected

Definition at line 61 of file MediumSpecificBagOStuff.php.


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