mongo::NamespaceUUIDCache Class Reference

#include <namespace_uuid_cache.h>

Public Member Functions
	NamespaceUUIDCache ()=default
void	ensureNamespaceInCache (const NamespaceString &nss, CollectionUUID uuid)
	This function adds the pair nss.ns(), uuid to the namespace UUID cache if it does not yet exist. More...
void	evictNamespace (const NamespaceString &nss)
	This function removes the entry for nss.ns() from the namespace UUID cache. More...
void	evictNamespacesInDatabase (StringData dbname)
	Same as above, but for all registered namespaces in the given dbname. More...
void	verifyNotCached (const NamespaceString &nss, CollectionUUID uuid)
	For testing only: verify that 'nss' is not cached. More...

Static Public Attributes
static const OperationContext::Decoration< NamespaceUUIDCache >	get

Private Types
using	CollectionUUIDMap = StringMap< CollectionUUID >

Private Member Functions
	MONGO_DISALLOW_COPYING (NamespaceUUIDCache)

Private Attributes
CollectionUUIDMap	_cache

Member Typedef Documentation

CollectionUUIDMap

using mongo::NamespaceUUIDCache::CollectionUUIDMap = StringMap<CollectionUUID>

private

Constructor & Destructor Documentation

NamespaceUUIDCache()

mongo::NamespaceUUIDCache::NamespaceUUIDCache ( )

default

Member Function Documentation

ensureNamespaceInCache()

void mongo::NamespaceUUIDCache::ensureNamespaceInCache	(	const NamespaceString &	nss,
		CollectionUUID	uuid
	)

This function adds the pair nss.ns(), uuid to the namespace UUID cache if it does not yet exist.

If nss.ns() already exists in the cache with a different UUID, a AssertionException is thrown, so we can guarantee that an operation will always resolve the same name to the same collection, even in presence of drops and renames.

evictNamespace()

void mongo::NamespaceUUIDCache::evictNamespace

(

const NamespaceString &

nss

)

This function removes the entry for nss.ns() from the namespace UUID cache.

Does nothing if the entry doesn't exist. It is called via the op observer when a collection is dropped or renamed.

evictNamespacesInDatabase()

void mongo::NamespaceUUIDCache::evictNamespacesInDatabase

(

StringData

dbname

)

Same as above, but for all registered namespaces in the given dbname.

MONGO_DISALLOW_COPYING()

mongo::NamespaceUUIDCache::MONGO_DISALLOW_COPYING ( NamespaceUUIDCache  )

private

verifyNotCached()

void mongo::NamespaceUUIDCache::verifyNotCached ( const NamespaceString &  nss, CollectionUUID  uuid  )

inline

For testing only: verify that 'nss' is not cached.

Member Data Documentation

_cache

CollectionUUIDMap mongo::NamespaceUUIDCache::_cache

private

get

const OperationContext::Decoration< NamespaceUUIDCache > mongo::NamespaceUUIDCache::get

static

Initial value:

=
    OperationContext::declareDecoration<NamespaceUUIDCache>()

---

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

• /home/louis/git/mongodbsource.github.io/src/src/mongo/db/catalog/namespace_uuid_cache.h
• /home/louis/git/mongodbsource.github.io/src/src/mongo/db/catalog/namespace_uuid_cache.cpp