A cache class that directs writes to one set of servers and reads to another. More...

Collaboration diagram for ReplicatedBagOStuff:

[legend]

Public Member Functions
	__construct ( $params)
	Constructor.

	add ( $key, $value, $exptime=0, $flags=0)
	Insert an item if it does not already exist.

	changeTTL ( $key, $exptime=0, $flags=0)
	Change the expiration on an item.

	changeTTLMulti (array $keys, $exptime, $flags=0)
	Change the expiration of multiple items.

	delete ( $key, $flags=0)
	Delete an item if it exists.

	deleteMulti (array $keys, $flags=0)
	Delete a batch of items.

	deleteObjectsExpiringBefore ( $timestamp, callable $progress=null, $limit=INF, string $tag=null)
	Delete all objects expiring before a certain date.

	get ( $key, $flags=0)
	Get an item.

	getMulti (array $keys, $flags=0)
	Get a batch of items.

	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.

	lock ( $key, $timeout=6, $exptime=6, $rclass='')
	Acquire an advisory lock on a key string, exclusive to the caller.

	merge ( $key, callable $callback, $exptime=0, $attempts=10, $flags=0)
	Merge changes into the existing cache value (possibly creating a new one)

	set ( $key, $value, $exptime=0, $flags=0)
	Set an item.

	setMockTime (&$time)

	setMulti (array $valueByKey, $exptime=0, $flags=0)
	Set a batch of items.

	unlock ( $key)
	Release an advisory lock on a key string.

Public Member Functions inherited from BagOStuff
	__construct (array $params=[])

	clearLastError ()
	Clear the "last error" registry.

	getCurrentTime ()

	getLastError ( $watchPoint=0)
	Get the "last error" registry.

	getLogger ()

	getQoS ( $flag)

	getScopedLock ( $key, $timeout=6, $exptime=30, $rclass='')
	Get a lightweight exclusive self-unlocking lock.

	getSegmentationSize ()

	getSegmentedValueMaxSize ()

	getWithSetCallback ( $key, $exptime, $callback, $flags=0)
	Get an item, regenerating and setting it if not found.

	isKeyGlobal ( $key)
	Check whether a cache key is in the global keyspace.

	makeGlobalKey ( $keygroup,... $components)
	Make a cache key from the given components, in the "global" keyspace.

	makeKey ( $keygroup,... $components)
	Make a cache key from the given components, in the default keyspace.

	setLogger (LoggerInterface $logger)

	setNewPreparedValues (array $valueByKey)
	Stage a set of new key values for storage and estimate the amount of bytes needed.

	watchErrors ()
	Get a "watch point" token that can be used to get the "last error" to occur after now.

Additional Inherited Members
Public Attributes inherited from BagOStuff
const	MAX_CONFLICTS_ONE = 1
	Abort after the first merge conflict.

const	READ_LATEST = 1
	Bitfield constants for get()/getMulti(); these are only advisory.

const	READ_VERIFIED = 2
	Promise that the caller handles detection of staleness.

const	WRITE_ALLOW_SEGMENTS = 16
	Allow partitioning of the value if it is a large string.

const	WRITE_BACKGROUND = 64
	If supported, do not block on write operation completion; instead, treat writes as succesful based on whether they could be buffered.

const	WRITE_CACHE_ONLY = 8
	Bitfield constants for set()/merge(); these are only advisory.

const	WRITE_PRUNE_SEGMENTS = 32
	Delete all the segments if the value is partitioned.

Public Attributes inherited from Wikimedia\LightweightObjectStore\StorageAwareness
const	ATTR_DURABILITY = 2
	Durability of writes; see QOS_DURABILITY_* (higher means stronger)

const	ATTR_EMULATION = 1

const	ERR_NO_RESPONSE = 1
	Storage medium failed to yield a complete response to an operation.

const	ERR_NONE = 0
	No storage medium error.

const	ERR_UNEXPECTED = 3
	Storage medium operation failed due to usage limitations or an I/O error.

const	ERR_UNREACHABLE = 2
	Storage medium could not be reached to establish a connection.

const	QOS_DURABILITY_DISK = 4
	Data is saved to disk and writes do not usually block on fsync()

const	QOS_DURABILITY_NONE = 1
	Data is never saved to begin with (blackhole store)

const	QOS_DURABILITY_RDBMS = 5
	Data is saved to disk and writes usually block on fsync(), like a standard RDBMS.

const	QOS_DURABILITY_SCRIPT = 2
	Data is lost at the end of the current web request or CLI script.

const	QOS_DURABILITY_SERVICE = 3
	Data is lost once the service storing the data restarts.

const	QOS_EMULATION_SQL = 1

const	QOS_UNKNOWN = INF
	Generic "unknown" value; useful for comparisons (always "good enough")

Protected Member Functions inherited from BagOStuff
	determineKeyPrefixForStats ( $key)

	fieldHasFlags ( $field, $flags)

	makeKeyInternal ( $keyspace, $components)
	Make a cache key for the given keyspace and components.

	mergeFlagMaps (array $bags)
	Merge the flag maps of one or more BagOStuff objects into a "lowest common denominator" map.

	proxyCall (string $method, int $arg0Sig, int $resSig, array $genericArgs, BagOStuff $wrapper)
	Call a method on behalf of wrapper BagOStuff instance.

	requireConvertGenericKey ()
	Whether ::proxyCall() must re-encode cache keys before calling read/write methods.

	setLastError ( $error)
	Set the "last error" registry due to a problem encountered during an attempted operation.

Protected Attributes inherited from BagOStuff
callable null	$asyncHandler

int[]	$attrMap = []
	Map of (BagOStuff:ATTR_* constant => BagOStuff:QOS_* constant)

string	$keyspace
	Default keyspace; used by makeKey()

int	$lastError = self::ERR_NONE
	BagOStuff:ERR_* constant of the last error that occurred.

int	$lastErrorId = 0
	Error event sequence number of the last error that occurred.

LoggerInterface	$logger

StatsdDataFactoryInterface	$stats

Static Protected Attributes inherited from BagOStuff
static int	$nextErrorMonitorId = 1
	Next sequence number to use for watch/error events.

Detailed Description

A cache class that directs writes to one set of servers and reads to another.

This assumes that the servers used for reads are setup to replica DB those that writes go to. This can easily be used with redis for example.

In the WAN scenario (e.g. multi-datacenter case), this is useful when writes are rare or they usually take place in the primary datacenter.

Since: 1.26

Definition at line 34 of file ReplicatedBagOStuff.php.

Constructor & Destructor Documentation

◆ __construct()

ReplicatedBagOStuff::__construct ( $params )

Constructor.

Parameters are:

writeFactory: ObjectFactory::getObjectFromSpec array yielding BagOStuff. This object will be used for writes (e.g. the primary DB).
readFactory: ObjectFactory::getObjectFromSpec array yielding BagOStuff. This object will be used for reads (e.g. a replica DB).
sessionConsistencyWindow: Seconds to read from the master source for a key after writing to it. [Default: ReplicatedBagOStuff::MAX_WRITE_DELAY]

Parameters

array $params

Exceptions

InvalidArgumentException

Definition at line 60 of file ReplicatedBagOStuff.php.

References BagOStuff\mergeFlagMaps().

Member Function Documentation

◆ add()

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

Insert an item if it does not already exist.

Parameters

string	$key
mixed	$value
int	$exptime
int	$flags	Bitfield of BagOStuff::WRITE_* constants (since 1.33)

Returns: bool Success (item created)

Reimplemented from BagOStuff.

Definition at line 124 of file ReplicatedBagOStuff.php.

◆ changeTTL()

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

Change the expiration on an item.

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	$exptime	TTL or UNIX timestamp
int	$flags	Bitfield of BagOStuff::WRITE_* constants (since 1.33)

Returns: bool Success (item found and updated)

Since: 1.28

Reimplemented from BagOStuff.

Definition at line 148 of file ReplicatedBagOStuff.php.

◆ changeTTLMulti()

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

Change the expiration of multiple items.

See also: BagOStuff::changeTTL()

Parameters

string[]	$keys	List of keys
int	$exptime	TTL or UNIX timestamp
int	$flags	Bitfield of BagOStuff::WRITE_* constants (since 1.33)

Returns: bool Success (all items found and updated)

Since: 1.34

Reimplemented from BagOStuff.

Definition at line 238 of file ReplicatedBagOStuff.php.

◆ delete()

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

Delete an item if it exists.

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	$flags	Bitfield of BagOStuff::WRITE_* constants

Returns: bool Success (item deleted or not found)

Reimplemented from BagOStuff.

Definition at line 112 of file ReplicatedBagOStuff.php.

◆ deleteMulti()

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

Delete a batch of items.

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

WRITE_BACKGROUND can be used for bulk deletion where the response is not vital

Parameters

string[]	$keys	List of keys
int	$flags	Bitfield of BagOStuff::WRITE_* constants

Returns: bool Success (items deleted and/or not found)

Since: 1.33

Reimplemented from BagOStuff.

Definition at line 226 of file ReplicatedBagOStuff.php.

◆ deleteObjectsExpiringBefore()

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

Delete all objects expiring before a certain date.

Parameters

string \| int	$timestamp	The reference date in MW or TS_UNIX format
callable \| null	$progress	Optional, a function which will be called regularly during long-running operations with the percentage progress as the first parameter. [optional]
int \| float	$limit	Maximum number of keys to delete [default: INF]
string \| null	$tag	Tag 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.

Definition at line 180 of file ReplicatedBagOStuff.php.

◆ get()

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

Get an item.

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	$flags	Bitfield of BagOStuff::READ_* constants [optional]

Returns: mixed Returns false on failure or if the item does not exist

Reimplemented from BagOStuff.

Definition at line 81 of file ReplicatedBagOStuff.php.

References BagOStuff\fieldHasFlags().

◆ getMulti()

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

Get a batch of items.

Parameters

string[]	$keys	List of keys
int	$flags	Bitfield; supports READ_LATEST [optional]

Returns: mixed[] Map of (key => value) for existing keys

Reimplemented from BagOStuff.

Definition at line 195 of file ReplicatedBagOStuff.php.

References BagOStuff\fieldHasFlags().

◆ incrWithInit()

ReplicatedBagOStuff::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	$key	Key built via makeKey() or makeGlobalKey()
int	$exptime	Time-to-live (in seconds) or a UNIX timestamp expiration
int	$step	Amount to increase the key value by [default: 1]
int \| null	$init	Value to initialize the key to if it does not exist [default: $step]
int	$flags	Bit field of class WRITE_* constants [optional]

Returns: int|bool New value (or true if asynchronous) on success; false on failure

Since: 1.24

Reimplemented from BagOStuff.

Definition at line 250 of file ReplicatedBagOStuff.php.

◆ lock()

ReplicatedBagOStuff::lock	(	$key,
		$timeout = 6,
		$exptime = 6,
		$rclass = '' )

Acquire an advisory lock on a key string, exclusive to the caller.

Parameters

string	$key
int	$timeout	Lock wait timeout; 0 for non-blocking [optional]
int	$exptime	Lock time-to-live in seconds; 1 day maximum [optional]
string	$rclass	If this thread already holds the lock, and the lock was acquired using the same value for this parameter, then return true and use reference counting so that only the unlock() call from the outermost lock() caller actually releases the lock (note that only the outermost time-to-live is used) [optional]

Returns: bool Success

Reimplemented from BagOStuff.

Definition at line 160 of file ReplicatedBagOStuff.php.

◆ merge()

ReplicatedBagOStuff::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	$callback	Callback method to be executed
int	$exptime	Either an interval in seconds or a unix timestamp for expiry
int	$attempts	The amount of times to attempt a merge in case of failure
int	$flags	Bitfield of BagOStuff::WRITE_* constants

Returns: bool Success

Exceptions

InvalidArgumentException

Reimplemented from BagOStuff.

Definition at line 136 of file ReplicatedBagOStuff.php.

◆ set()

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

Set an item.

Parameters

string	$key
mixed	$value
int	$exptime	Either an interval in seconds or a unix timestamp for expiry
int	$flags	Bitfield of BagOStuff::WRITE_* constants

Returns: bool Success

Reimplemented from BagOStuff.

Definition at line 100 of file ReplicatedBagOStuff.php.

◆ setMockTime()

ReplicatedBagOStuff::setMockTime ( & $time )

Access: internal: For testing only

Parameters

float | null &$time Mock UNIX timestamp

Reimplemented from BagOStuff.

Definition at line 262 of file ReplicatedBagOStuff.php.

◆ setMulti()

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

Set a batch of items.

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

WRITE_BACKGROUND can be used for bulk insertion where the response is not vital

Parameters

mixed[]	$valueByKey	Map of (key => value)
int	$exptime	Either an interval in seconds or a unix timestamp for expiry
int	$flags	Bitfield of BagOStuff::WRITE_* constants (since 1.33)

Returns: bool Success

Since: 1.24

Reimplemented from BagOStuff.

Definition at line 214 of file ReplicatedBagOStuff.php.

◆ unlock()

ReplicatedBagOStuff::unlock ( $key )

Release an advisory lock on a key string.

Parameters

string $key

Returns: bool Success

Reimplemented from BagOStuff.

Definition at line 170 of file ReplicatedBagOStuff.php.

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

includes/libs/objectcache/ReplicatedBagOStuff.php

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ add()

◆ changeTTL()

◆ changeTTLMulti()

◆ delete()

◆ deleteMulti()

◆ deleteObjectsExpiringBefore()

◆ get()

◆ getMulti()

◆ incrWithInit()

◆ lock()

◆ merge()

◆ set()

◆ setMockTime()

◆ setMulti()

◆ unlock()