#include <userver/cache/base_postgres_cache.hpp>

Detailed Description

template<typename PostgreCachePolicy>
class components::PostgreCache< PostgreCachePolicy >

Caching component for PostgreSQL. See Caching Component for PostgreSQL.

See also: Caching Component for PostgreSQL, Basics of Caches

Examples: samples/postgres_auth/user_info_cache.hpp.

Definition at line 381 of file base_postgres_cache.hpp.

Inheritance diagram for components::PostgreCache< PostgreCachePolicy >:

Public Types
using	PolicyType = PostgreCachePolicy

using	ValueType = pg_cache::detail::ValueType<PolicyType>

using	RawValueType = pg_cache::detail::RawValueType<PolicyType>

using	DataType = pg_cache::detail::DataCacheContainerType<PolicyType>

using	PolicyCheckerType = pg_cache::detail::PolicyChecker<PostgreCachePolicy>

using	UpdatedFieldType = pg_cache::detail::UpdatedFieldType<PostgreCachePolicy>

using	BaseType = typename PolicyCheckerType::BaseType

Public Member Functions
	PostgreCache (const ComponentConfig &, const ComponentContext &)

utils::SharedReadablePtr< T >	Get () const

utils::SharedReadablePtr< T >	GetUnsafe () const

template<class Class >
concurrent::AsyncEventSubscriberScope	UpdateAndListen (Class obj, std::string name, void(Class::func)(const std::shared_ptr< const T > &))

concurrent::AsyncEventChannel< const std::shared_ptr< const T > & > &	GetEventChannel ()

ComponentHealth	GetComponentHealth () const override

void	OnLoadingCancelled () override

void	OnAllComponentsAreStopping () override

Static Public Member Functions
static yaml_config::Schema	GetStaticConfigSchema ()

Static Public Attributes
static constexpr bool	kIncrementalUpdates = pg_cache::detail::kWantIncrementalUpdates<PolicyType>

static constexpr auto	kClusterHostTypeFlags = pg_cache::detail::ClusterHostType<PolicyType>()

static constexpr auto	kName = PolicyType::kName

Protected Types
using	LoggableComponentBase = ComponentBase
	Legacy alias, use ComponentBase instead.

enum class	Flag { kNone = 0 , kNoFirstUpdate = 1 << 0 }
	Periodic update flags. More...

Protected Member Functions
void	Set (std::unique_ptr< const T > value_ptr)

void	Set (T &&value)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

template<typename... Args>
void	Emplace (Args &&... args)

void	Clear ()
	Clears the content of the cache by string a default constructed T.

virtual void	PreAssignCheck (const T old_value_ptr, const T new_value_ptr) const
	If the option has-pre-assign-check is set true in static config, this function is called before assigning the new value to the cache.

void	InvalidateAsync (UpdateType update_type)
	Non-blocking forced cache update of specified type.

void	UpdateSyncDebug (UpdateType update_type)
	Forces a cache update of specified type.

const std::string &	Name () const

AllowedUpdateTypes	GetAllowedUpdateTypes () const
	Update types configured for the cache.

void	StartPeriodicUpdates (utils::Flags< Flag > flags={})
	Starts periodic updates.

void	StopPeriodicUpdates ()
	Stops periodic updates.

void	AssertPeriodicUpdateStarted ()

void	AssertPeriodicUpdateStopped ()

void	OnCacheModified ()


virtual void	WriteContents (dump::Writer &writer, const T &contents) const

virtual std::unique_ptr< const T >	ReadContents (dump::Reader &reader) const

Member Typedef Documentation

◆ BaseType

template<typename PostgreCachePolicy >

using components::PostgreCache< PostgreCachePolicy >::BaseType = typename PolicyCheckerType::BaseType

Definition at line 390 of file base_postgres_cache.hpp.

◆ DataType

template<typename PostgreCachePolicy >

using components::PostgreCache< PostgreCachePolicy >::DataType = pg_cache::detail::DataCacheContainerType<PolicyType>

Definition at line 387 of file base_postgres_cache.hpp.

◆ LoggableComponentBase

using components::ComponentBase::LoggableComponentBase = ComponentBase

protectedinherited

Legacy alias, use ComponentBase instead.

Definition at line 67 of file component_base.hpp.

◆ PolicyCheckerType

template<typename PostgreCachePolicy >

using components::PostgreCache< PostgreCachePolicy >::PolicyCheckerType = pg_cache::detail::PolicyChecker<PostgreCachePolicy>

Definition at line 388 of file base_postgres_cache.hpp.

◆ PolicyType

template<typename PostgreCachePolicy >

using components::PostgreCache< PostgreCachePolicy >::PolicyType = PostgreCachePolicy

Definition at line 384 of file base_postgres_cache.hpp.

◆ RawValueType

template<typename PostgreCachePolicy >

using components::PostgreCache< PostgreCachePolicy >::RawValueType = pg_cache::detail::RawValueType<PolicyType>

Definition at line 386 of file base_postgres_cache.hpp.

◆ UpdatedFieldType

template<typename PostgreCachePolicy >

using components::PostgreCache< PostgreCachePolicy >::UpdatedFieldType = pg_cache::detail::UpdatedFieldType<PostgreCachePolicy>

Definition at line 389 of file base_postgres_cache.hpp.

◆ ValueType

template<typename PostgreCachePolicy >

using components::PostgreCache< PostgreCachePolicy >::ValueType = pg_cache::detail::ValueType<PolicyType>

Definition at line 385 of file base_postgres_cache.hpp.

Member Enumeration Documentation

◆ Flag

enum class cache::CacheUpdateTrait::Flag

strongprotectedinherited

Periodic update flags.

Enumerator

kNoFirstUpdate

Disable initial update on start.

Deprecated: Use first-update-fail-ok: true instead

Definition at line 61 of file cache_update_trait.hpp.

Constructor & Destructor Documentation

◆ PostgreCache()

template<typename PostgreCachePolicy >

components::PostgreCache< PostgreCachePolicy >::PostgreCache	(	const ComponentConfig &	config,
		const ComponentContext &	context )

Definition at line 443 of file base_postgres_cache.hpp.

◆ ~PostgreCache()

template<typename PostgreCachePolicy >

components::PostgreCache< PostgreCachePolicy >::~PostgreCache ( )

override

Definition at line 491 of file base_postgres_cache.hpp.

Member Function Documentation

◆ Clear()

template<typename T >

void components::CachingComponentBase< T >::Clear ( )

protectedinherited

Clears the content of the cache by string a default constructed T.

Definition at line 311 of file caching_component_base.hpp.

◆ Emplace()

template<typename T >

template<typename... Args>

void components::CachingComponentBase< T >::Emplace ( Args &&... args )

protectedinherited

Definition at line 306 of file caching_component_base.hpp.

◆ Get()

template<typename T >

utils::SharedReadablePtr< T > components::CachingComponentBase< T >::Get ( ) const

inherited

Returns: cache contents. May be nullptr if and only if MayReturnNull returns true.

Exceptions

cache::EmptyCacheError if the contents are nullptr, and MayReturnNull returns false (which is the default behavior).

Definition at line 254 of file caching_component_base.hpp.

◆ GetComponentHealth()

ComponentHealth components::ComponentBase::GetComponentHealth ( ) const

inlineoverridevirtualinherited

Override this function to inform the world of the state of your component.

Warning: The function is called concurrently from multiple threads.

Reimplemented from components::RawComponentBase.

Reimplemented in server::handlers::Restart.

Definition at line 35 of file component_base.hpp.

◆ GetEventChannel()

template<typename T >

concurrent::AsyncEventChannel< const std::shared_ptr< const T > & > & components::CachingComponentBase< T >::GetEventChannel ( )

inherited

Definition at line 276 of file caching_component_base.hpp.

◆ GetStaticConfigSchema()

template<typename PostgreCachePolicy >

yaml_config::Schema components::PostgreCache< PostgreCachePolicy >::GetStaticConfigSchema ( )

static

Definition at line 698 of file base_postgres_cache.hpp.

◆ GetUnsafe()

template<typename T >

utils::SharedReadablePtr< T > components::CachingComponentBase< T >::GetUnsafe ( ) const

inherited

Returns: cache contents. May be nullptr regardless of MayReturnNull().

Definition at line 281 of file caching_component_base.hpp.

◆ InvalidateAsync()

void cache::CacheUpdateTrait::InvalidateAsync ( UpdateType update_type )

inherited

Non-blocking forced cache update of specified type.

See also: PeriodicTask::ForceStepAsync for behavior details

◆ Name()

const std::string & cache::CacheUpdateTrait::Name ( ) const

inherited

Returns: name of the component

◆ OnAllComponentsAreStopping()

void components::ComponentBase::OnAllComponentsAreStopping ( )

inlineoverridevirtualinherited

Component may use this function to stop doing work before the stop of the components that depend on it.

Base components may override it and make final to do some work before the derived object constructor is called. Don't use it otherwise.

Reimplemented from components::RawComponentBase.

Reimplemented in urabbitmq::ConsumerComponentBase, and components::Server.

Definition at line 58 of file component_base.hpp.

◆ OnCacheModified()

void cache::CacheUpdateTrait::OnCacheModified ( )

protectedinherited

Called in CachingComponentBase::Set during update to indicate that the cached data has been modified

◆ OnLoadingCancelled()

void components::ComponentBase::OnLoadingCancelled ( )

inlineoverridevirtualinherited

Called once if the creation of any other component failed. If the current component expects some other component to take any action with the current component, this call is a signal that such action may never happen due to components loading was cancelled. Application components might not want to override it.

Reimplemented from components::RawComponentBase.

Definition at line 42 of file component_base.hpp.

◆ PreAssignCheck()

template<typename T >

void components::CachingComponentBase< T >::PreAssignCheck	(	const T *	old_value_ptr,
		const T *	new_value_ptr ) const

protectedvirtualinherited

If the option has-pre-assign-check is set true in static config, this function is called before assigning the new value to the cache.

Note: old_value_ptr and new_value_ptr can be nullptr.

Definition at line 393 of file caching_component_base.hpp.

◆ ReadContents()

template<typename T >

std::unique_ptr< const T > components::CachingComponentBase< T >::ReadContents ( dump::Reader & reader ) const

protectedvirtualinherited

Definition at line 348 of file caching_component_base.hpp.

◆ Set() [1/2]

template<typename T >

void components::CachingComponentBase< T >::Set ( std::unique_ptr< const T > value_ptr )

protectedinherited

Sets the new value of cache. As a result the Get() member function starts returning the value passed into this function after the Update() finishes.

Warning: Do not forget to update cache::UpdateStatisticsScope, otherwise the behavior is undefined.

Definition at line 286 of file caching_component_base.hpp.

◆ Set() [2/2]

template<typename T >

void components::CachingComponentBase< T >::Set ( T && value )

protectedinherited

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Definition at line 300 of file caching_component_base.hpp.

◆ StopPeriodicUpdates()

void cache::CacheUpdateTrait::StopPeriodicUpdates ( )

protectedinherited

Stops periodic updates.

Warning: Should be called in destructor of derived class.

◆ UpdateAndListen()

template<typename T >

template<typename Class >

concurrent::AsyncEventSubscriberScope components::CachingComponentBase< T >::UpdateAndListen	(	Class *	obj,
		std::string	name,
		void(Class::*)(const std::shared_ptr< const T > &)	func )

inherited

Subscribes to cache updates using a member function. Also immediately invokes the function with the current cache contents.

Definition at line 264 of file caching_component_base.hpp.

◆ UpdateSyncDebug()

void cache::CacheUpdateTrait::UpdateSyncDebug ( UpdateType update_type )

inherited

Forces a cache update of specified type.

Exceptions

If	`Update` throws

◆ WriteContents()

template<typename T >

void components::CachingComponentBase< T >::WriteContents	(	dump::Writer &	writer,
		const T &	contents ) const

protectedvirtualinherited

Override to use custom serialization for cache dumps

Definition at line 339 of file caching_component_base.hpp.

Member Data Documentation

◆ kClusterHostTypeFlags

template<typename PostgreCachePolicy >

constexpr auto components::PostgreCache< PostgreCachePolicy >::kClusterHostTypeFlags = pg_cache::detail::ClusterHostType<PolicyType>()

staticconstexpr

Definition at line 394 of file base_postgres_cache.hpp.

◆ kIncrementalUpdates

template<typename PostgreCachePolicy >

constexpr bool components::PostgreCache< PostgreCachePolicy >::kIncrementalUpdates = pg_cache::detail::kWantIncrementalUpdates<PolicyType>

staticconstexpr

Definition at line 393 of file base_postgres_cache.hpp.

◆ kName

template<typename PostgreCachePolicy >

constexpr auto components::PostgreCache< PostgreCachePolicy >::kName = PolicyType::kName

staticconstexpr

Definition at line 395 of file base_postgres_cache.hpp.

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

userver/cache/base_postgres_cache.hpp

Detailed Description

Public Types

Public Member Functions

Static Public Member Functions

Static Public Attributes

Protected Types

Protected Member Functions

Member Typedef Documentation

◆ BaseType

◆ DataType

◆ LoggableComponentBase

◆ PolicyCheckerType

◆ PolicyType

◆ RawValueType

◆ UpdatedFieldType

◆ ValueType

Member Enumeration Documentation

◆ Flag

Constructor & Destructor Documentation

◆ PostgreCache()

◆ ~PostgreCache()

Member Function Documentation

◆ Clear()

◆ Emplace()

◆ Get()

◆ GetComponentHealth()

◆ GetEventChannel()

◆ GetStaticConfigSchema()

◆ GetUnsafe()

◆ InvalidateAsync()

◆ Name()

◆ OnAllComponentsAreStopping()

◆ OnCacheModified()

◆ OnLoadingCancelled()

◆ PreAssignCheck()

◆ ReadContents()

◆ Set() [1/2]

◆ Set() [2/2]

◆ StopPeriodicUpdates()

◆ UpdateAndListen()

◆ UpdateSyncDebug()

◆ WriteContents()

Member Data Documentation

◆ kClusterHostTypeFlags

◆ kIncrementalUpdates

◆ kName