Kea: isc::cb::BaseConfigBackendPool< ConfigBackendType > Class Template Reference

| Kea 3.0.0

isc::cb::BaseConfigBackendPool< ConfigBackendType > Class Template Reference

Base class for configuration backend pools. More...

`#include <base_config_backend_pool.h>`

## Public Types
typedef boost::shared_ptr< ConfigBackendType > | ConfigBackendTypePtr
| Shared pointer to the Configuration Backend used.

## Public Member Functions
virtual | ~BaseConfigBackendPool ()
| Virtual destructor.
void | addBackend (ConfigBackendTypePtr backend)
| Adds a backend to the pool.
bool | del (const std::string &db_type, const std::string &dbaccess, bool if_unusable)
| Deletes all backends of the given type from the pool.
void | delAllBackends ()
| Deletes all backends from the pool.
void | delAllBackends (const std::string &db_type)
| Deletes all backends of the given type from the pool.

## Protected Member Functions
template<typename ReturnValue, typename... FnPtrArgs, typename... Args>
ReturnValue | createUpdateDeleteBackendProperty (ReturnValue(ConfigBackendType::*MethodPointer)(FnPtrArgs...), const db::BackendSelector &backend_selector, Args... input)
| Add, update or delete property from the backend.
template<typename ReturnValue, typename... FnPtrArgs, typename... Args>
ReturnValue | createUpdateDeleteProperty (ReturnValue(ConfigBackendType::*MethodPointer)(const db::ServerSelector &, FnPtrArgs...), const db::BackendSelector &backend_selector, const db::ServerSelector &server_selector, Args... input)
| Add, update or delete property from the backend.
template<typename PropertyCollectionType>
void | getAllBackendPropertiesConst (PropertyCollectionType(ConfigBackendType::*MethodPointer)() const, const db::BackendSelector &backend_selector, PropertyCollectionType &properties) const
| Get all configuration properties from the backend.
template<typename PropertyCollectionType>
void | getAllPropertiesConst (PropertyCollectionType(ConfigBackendType::*MethodPointer)(const db::ServerSelector &) const, const db::BackendSelector &backend_selector, const db::ServerSelector &server_selector, PropertyCollectionType &properties) const
| Retrieve all configuration properties from the pool.
template<typename PropertyType, typename... FnPtrArgs, typename... Args>
void | getBackendPropertyPtrConst (PropertyType(ConfigBackendType::*MethodPointer)(FnPtrArgs...) const, const db::BackendSelector &backend_selector, PropertyType &property, Args... input) const
| Retrieve a single configuration property from the backend.
template<typename PropertyCollectionType, typename... FnPtrArgs, typename... Args>
void | getMultiplePropertiesConst (PropertyCollectionType(ConfigBackendType::*MethodPointer)(const db::ServerSelector &, FnPtrArgs...) const, const db::BackendSelector &backend_selector, const db::ServerSelector &server_selector, PropertyCollectionType &properties, Args... input) const
| Retrieve multiple configuration properties from the pool.
template<typename PropertyType, typename... FnPtrArgs, typename... Args>
void | getPropertyPtrConst (PropertyType(ConfigBackendType::*MethodPointer)(const db::ServerSelector &, FnPtrArgs...) const, const db::BackendSelector &backend_selector, const db::ServerSelector &server_selector, PropertyType &property, Args... input) const
| Retrieve a single configuration property from the pool.
std::list< ConfigBackendTypePtr > | selectBackends (const db::BackendSelector &backend_selector) const
| Selects existing backends matching the selector.

## Protected Attributes
std::list< ConfigBackendTypePtr > | backends_
| Holds configuration backends belonging to the pool.

## Detailed Description

template<typename ConfigBackendType>
class isc::cb::BaseConfigBackendPool< ConfigBackendType >

Base class for configuration backend pools.

Each Kea server supporting databases as a configuration repository can use multiple database instances simultaneously. A pool is a collection of database backends used by a particular server. Different Kea servers use different pools because they store and fetch different configuration information. For example: DHCPv4 server stores and fetches IPv4 subnets, and DHCPv6 server stores and fetches IPv6 subnets. Therefore, each pool type will expose a different API calls.

This template class is a base class for all pools used by various servers. It implements mechanisms for managing multiple backends and for forwarding API calls to one or many database backends depending on the selections made via `BackendSelector` class.

Template Parameters

  ConfigBackendType | Type of the configuration backend. This must be a class deriving from `BaseConfigBackend` class. It is a class dedicated to a particular server type, e.g. DHCPv4 server, and from which database specific backends derive.

Definition at line 44 of file base_config_backend_pool.h.

## Member Typedef Documentation

## ◆ ConfigBackendTypePtr

template<typename ConfigBackendType>

typedef boost::shared_ptr<ConfigBackendType> isc::cb::BaseConfigBackendPool< ConfigBackendType >::ConfigBackendTypePtr

Shared pointer to the Configuration Backend used.

Definition at line 48 of file base_config_backend_pool.h.

## Constructor & Destructor Documentation

## ◆ ~BaseConfigBackendPool()

template<typename ConfigBackendType>

virtual isc::cb::BaseConfigBackendPool< ConfigBackendType >::~BaseConfigBackendPool | ( |  | ) |
| inlinevirtual

Virtual destructor.

Definition at line 51 of file base_config_backend_pool.h.

## Member Function Documentation

## ◆ addBackend()

template<typename ConfigBackendType>

void isc::cb::BaseConfigBackendPool< ConfigBackendType >::addBackend | ( | ConfigBackendTypePtr | backend | ) |
| inline

Adds a backend to the pool.

Parameters

  backend | Pointer to a backend to be added.

Definition at line 56 of file base_config_backend_pool.h.

References backends_.

## ◆ createUpdateDeleteBackendProperty()

template<typename ConfigBackendType>
template<typename ReturnValue, typename... FnPtrArgs, typename... Args>

ReturnValue isc::cb::BaseConfigBackendPool< ConfigBackendType >::createUpdateDeleteBackendProperty | ( | ReturnValue(ConfigBackendType::* | MethodPointer )(FnPtrArgs...),
|  | const db::BackendSelector & | backend_selector,
|  | Args... | input )
| inlineprotected

Add, update or delete property from the backend.

This is a common method for storing a single configuration property in a database, updating an existing property or deleting the property without specifying the server selector. The server specific backends call this method. For example, the DHCPv4 configuration backend pool may use this function to implement the `createUpdateServer4` method:

void createUpdateServer4(const BackendSelector& backend_selector,
const ServerSelector& server_selector,
const ServerPtr& server) {
createUpdateDeleteBackendProperty<void, const ServerPtr&>
(&ConfigBackendDHCPv4::createUpdateServer4, backend_selector,
server);
}
isc::cb::BaseConfigBackendPool::createUpdateDeleteBackendProperty
ReturnValue createUpdateDeleteBackendProperty(ReturnValue(ConfigBackendType::*MethodPointer)(FnPtrArgs...), const db::BackendSelector &backend_selector, Args... input)
Add, update or delete property from the backend.
Definition base_config_backend_pool.h:571

where `ConfigBackendDHCPv4::createUpdateServer4` has the following signature:

void createUpdateServer4(const ServerPtr&);

This method is used in cases when server selector is not applicable.

Template Parameters

  ReturnValue | Returned value, typically void or uint64_t.
  FnPtrArgs | Parameter pack holding argument types of the backend method to be invoked.
  Args | Parameter pack holding types of the arguments provided in the call to this method.

Parameters

  MethodPointer | Pointer to the backend method to be called.
  backend_selector | Backend selector.
  input | Objects used as arguments to the backend method to be called.

Exceptions

  db::NoSuchDatabase | if no database matching the given selector was found.
  db::AmbiguousDatabase | if multiple databases matching the selector were found.

Returns
  Number of affected properties, if the value is non void.

Definition at line 571 of file base_config_backend_pool.h.

References isc_throw, selectBackends(), and isc::db::BackendSelector::toText().

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## ◆ createUpdateDeleteProperty()

template<typename ConfigBackendType>
template<typename ReturnValue, typename... FnPtrArgs, typename... Args>

ReturnValue isc::cb::BaseConfigBackendPool< ConfigBackendType >::createUpdateDeleteProperty | ( | ReturnValue(ConfigBackendType::* | MethodPointer )(const db::ServerSelector &, FnPtrArgs...),
|  | const db::BackendSelector & | backend_selector,
|  | const db::ServerSelector & | server_selector,
|  | Args... | input )
| inlineprotected

Add, update or delete property from the backend.

This is a common method for storing a single configuration property in a database, updating an existing property or deleting the property. The server specific backends call this method. For example, the DHCPv6 configuration backend pool may use this function to implement a `createUpdateSubnet6` method:

void createUpdateSubnet6(const Subnet6Ptr& subnet,
const BackendSelector& backend_selector,
const ServerSelector& server_selector) {
createUpdateDeleteProperty<void, const Subnet6Ptr&>
(&ConfigBackendDHCPv6::createUpdateSubnet6, backend_selector,
server_selector, subnet, selector);
}
isc::cb::BaseConfigBackendPool::createUpdateDeleteProperty
ReturnValue createUpdateDeleteProperty(ReturnValue(ConfigBackendType::*MethodPointer)(const db::ServerSelector &, FnPtrArgs...), const db::BackendSelector &backend_selector, const db::ServerSelector &server_selector, Args... input)
Add, update or delete property from the backend.
Definition base_config_backend_pool.h:509

where `ConfigBackendDHCPv6::createUpdateSubnet6` has the following signature:

void createUpdateSubnet6(const ServerSelector&, const Subnet6Ptr&);

The backend selector must point to exactly one backend. If more than one backend is selected, an exception is thrown. If no backend is selected an exception is thrown either.

Template Parameters

  ReturnValue | Returned value, typically void or uint64_t.
  FnPtrArgs | Parameter pack holding argument types of the backend method to be invoked.
  Args | Parameter pack holding types of the arguments provided in the call to this method.

Parameters

  MethodPointer | Pointer to the backend method to be called.
  backend_selector | Backend selector.
  server_selector | Server selector.
  input | Objects used as arguments to the backend method to be called.

Exceptions

  db::NoSuchDatabase | if no database matching the given selector was found.
  db::AmbiguousDatabase | if multiple databases matching the selector were found.

Returns
  Number of affected properties, if the value is non void.

Definition at line 509 of file base_config_backend_pool.h.

References isc_throw, selectBackends(), and isc::db::BackendSelector::toText().

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## ◆ del()

template<typename ConfigBackendType>

bool isc::cb::BaseConfigBackendPool< ConfigBackendType >::del | ( | const std::string & | db_type,
|  | const std::string & | dbaccess,
|  | bool | if_unusable )
| inline

Deletes all backends of the given type from the pool.

Parameters

  db_type | Backend to remove.
  dbaccess | Database access string being a collection of key=value pairs.
  if_unusable | Flag which indicates if the config backend should be deleted only if it is unusable.

Returns
  false when not removed because it is not found or because it is still usable (if_unusable is true), true otherwise.

Definition at line 89 of file base_config_backend_pool.h.

References backends_, and isc::db::DatabaseConnection::parse().

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## ◆ delAllBackends() [1/2]

template<typename ConfigBackendType>

void isc::cb::BaseConfigBackendPool< ConfigBackendType >::delAllBackends | ( |  | ) |
| inline

Deletes all backends from the pool.

Definition at line 61 of file base_config_backend_pool.h.

References backends_.

## ◆ delAllBackends() [2/2]

template<typename ConfigBackendType>

void isc::cb::BaseConfigBackendPool< ConfigBackendType >::delAllBackends | ( | const std::string & | db_type | ) |
| inline

Deletes all backends of the given type from the pool.

Parameters

  db_type | Backend to remove.

Definition at line 68 of file base_config_backend_pool.h.

References backends_.

## ◆ getAllBackendPropertiesConst()

template<typename ConfigBackendType>
template<typename PropertyCollectionType>

void isc::cb::BaseConfigBackendPool< ConfigBackendType >::getAllBackendPropertiesConst | ( | PropertyCollectionType(ConfigBackendType::* | MethodPointer )() const,
|  | const db::BackendSelector & | backend_selector,
|  | PropertyCollectionType & | properties ) const
| inlineprotected

Get all configuration properties from the backend.

This is a common method for retrieving all configuration properties from the selected database without specifying the server selector. The server specific backends call this method to retrieve all objects of the same type. For example, the DHCPv4 configuration backend pool may use this function to implement a `getAllServers4` method:

ServerCollection getAllServers4(const BackendSelector&) const {
ServerCollection servers;
getAllBackendPropertiesConst<ServerCollection>
(&ConfigBackendDHCPv4::getAllServers4, backend_selector, servers);
return (servers);
}
isc::cb::BaseConfigBackendPool::getAllBackendPropertiesConst
void getAllBackendPropertiesConst(PropertyCollectionType(ConfigBackendType::*MethodPointer)() const, const db::BackendSelector &backend_selector, PropertyCollectionType &properties) const
Get all configuration properties from the backend.
Definition base_config_backend_pool.h:446

where `ConfigBackendDHCPv4::getAllServers4` has the following signature:

ServerCollection getAllServers4() const;

This method is used in cases when server selector is not applicable.

Template Parameters

  PropertyCollectionType | Type of the container into which the properties are stored.

Parameters

  | MethodPointer | Pointer to the backend method to be called.
  | backend_selector | Backend selector.
  [out] | properties | Reference to the collection of retrieved properties.

Exceptions

  db::NoSuchDatabase | if no database matching the given selector was found.
  db::AmbiguousDatabase | if multiple databases matching the selector were found.

Definition at line 446 of file base_config_backend_pool.h.

References isc_throw, selectBackends(), and isc::db::BackendSelector::toText().

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## ◆ getAllPropertiesConst()

template<typename ConfigBackendType>
template<typename PropertyCollectionType>

void isc::cb::BaseConfigBackendPool< ConfigBackendType >::getAllPropertiesConst | ( | PropertyCollectionType(ConfigBackendType::* | MethodPointer )(const db::ServerSelector &) const,
|  | const db::BackendSelector & | backend_selector,
|  | const db::ServerSelector & | server_selector,
|  | PropertyCollectionType & | properties ) const
| inlineprotected

Retrieve all configuration properties from the pool.

This is a common method for retrieving all configuration properties from the databases. The server specific backends call this method to retrieve all objects of the same type. For example, the DHCPv4 configuration backend pool may use this function to implement a `getAllSubnets4` method:

Subnet4Collection getAllSubnets4(const BackendSelector&, const ServerSelector&) const {
Subnet4Collection subnets;
getAllPropertiesConst<Subnet6Collection>
(&ConfigBackendDHCPv4::getAllSubnets4, subnets, backend_selector,
server_selector);
return (subnets);
}
isc::cb::BaseConfigBackendPool::getAllPropertiesConst
void getAllPropertiesConst(PropertyCollectionType(ConfigBackendType::*MethodPointer)(const db::ServerSelector &) const, const db::BackendSelector &backend_selector, const db::ServerSelector &server_selector, PropertyCollectionType &properties) const
Retrieve all configuration properties from the pool.
Definition base_config_backend_pool.h:379

where `ConfigBackendDHCPv4::getAllSubnets4` has the following signature:

Subnet4Collection getAllSubnets4(const ServerSelector&) const;

If the backend selector is set to "unspecified", this method will iterate over existing backends and call the `MethodPointer` method on each backend. It will return the first non-empty list returned by one of the backends.

Template Parameters

  PropertyCollectionType | Type of the container into which the properties are stored.

Parameters

  | MethodPointer | Pointer to the backend method to be called.
  | backend_selector | Backend selector.
  | server_selector | Server selector.
  [out] | properties | Reference to the collection of retrieved properties.

Exceptions

  db::NoSuchDatabase | if no database matching the given selector was found.

Definition at line 379 of file base_config_backend_pool.h.

References isc::db::BackendSelector::amUnspecified(), backends_, isc_throw, selectBackends(), and isc::db::BackendSelector::toText().

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## ◆ getBackendPropertyPtrConst()

template<typename ConfigBackendType>
template<typename PropertyType, typename... FnPtrArgs, typename... Args>

void isc::cb::BaseConfigBackendPool< ConfigBackendType >::getBackendPropertyPtrConst | ( | PropertyType(ConfigBackendType::* | MethodPointer )(FnPtrArgs...) const,
|  | const db::BackendSelector & | backend_selector,
|  | PropertyType & | property,
|  | Args... | input ) const
| inlineprotected

Retrieve a single configuration property from the backend.

This is common method for retrieving a single configuration property from the selected database without specifying the server selector. The server specific backends call this method to retrieve a single object. For example, the DHCPv4 configuration backend pool may use this function to implement a `getServer4` method:

ServerPtr getServer4(const BackendSelector& backend_selector,
const std::string& server_tag) const {
ServerPtr server;
getPropertyPtrConst<ServerPtr, const std::string&>
(&ConfigBackendDHCPv4::getServer4, backend_selector,
server_tag);
return (server);
}
isc::cb::BaseConfigBackendPool::getPropertyPtrConst
void getPropertyPtrConst(PropertyType(ConfigBackendType::*MethodPointer)(const db::ServerSelector &, FnPtrArgs...) const, const db::BackendSelector &backend_selector, const db::ServerSelector &server_selector, PropertyType &property, Args... input) const
Retrieve a single configuration property from the pool.
Definition base_config_backend_pool.h:164

where `ConfigBackendDHCPv4::getServer4` has the following signature:

ServerPtr getServer4(const std::string&) const;

This method is used in cases when server selector is not applicable.

Template Parameters

  PropertyType | Type of the object returned by the backend call.
  FnPtrArgs | Parameter pack holding argument types of the backend method to be invoked.
  Args | Parameter pack holding types of the arguments provided in the call to this method.

Parameters

  | MethodPointer | Pointer to the backend method to be called.
  | backend_selector | Backend selector.
  [out] | property | Reference to the shared pointer where retrieved property should be assigned.
  | input | Values to be used as input to the backend call.

Exceptions

  db::NoSuchDatabase | if no database matching the given selector was found.
  db::AmbiguousDatabase | if multiple databases matching the selector were found.

Definition at line 243 of file base_config_backend_pool.h.

References isc_throw, selectBackends(), and isc::db::BackendSelector::toText().

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## ◆ getMultiplePropertiesConst()

template<typename ConfigBackendType>
template<typename PropertyCollectionType, typename... FnPtrArgs, typename... Args>

void isc::cb::BaseConfigBackendPool< ConfigBackendType >::getMultiplePropertiesConst | ( | PropertyCollectionType(ConfigBackendType::* | MethodPointer )(const db::ServerSelector &, FnPtrArgs...) const,
|  | const db::BackendSelector & | backend_selector,
|  | const db::ServerSelector & | server_selector,
|  | PropertyCollectionType & | properties,
|  | Args... | input ) const
| inlineprotected

Retrieve multiple configuration properties from the pool.

This is a common method for retrieving multiple configuration properties from the databases. The server specific backends call this method to retrieve multiple objects of the same type. For example, the DHCPv6 configuration backend pool may use this function to implement a `getSubnets6` method:

Subnet6Collection getModifiedSubnets6(const BackendSelector& backend_selector,
const ServerSelector& server_selector,
const ptime& modification_time) const {
Subnet6Collection subnets;
getMultiplePropertiesConst<Subnet6Collection, const ptime&>
(&ConfigBackendDHCPv6::getSubnets6, backend_selector, server_selector,
subnets, modification_time);
return (subnets);
}
isc::cb::BaseConfigBackendPool::getMultiplePropertiesConst
void getMultiplePropertiesConst(PropertyCollectionType(ConfigBackendType::*MethodPointer)(const db::ServerSelector &, FnPtrArgs...) const, const db::BackendSelector &backend_selector, const db::ServerSelector &server_selector, PropertyCollectionType &properties, Args... input) const
Retrieve multiple configuration properties from the pool.
Definition base_config_backend_pool.h:308

where `ConfigBackendDHCPv6::getSubnets6` has the following signature:

Subnet6Collection getSubnets6(const ServerSelector&, const ptime&) const;

If the backend selector is set to "unspecified", this method will iterate over existing backends and call the `MethodPointer` method on each backend. It will return the first non-empty list returned by one of the backends.

Template Parameters

  PropertyCollectionType | Type of the container into which the properties are stored.
  FnPtrArgs | Parameter pack holding argument types of the backend method to be invoked.
  Args | Parameter pack holding types of the arguments provided in the call to this method.

Parameters

  | MethodPointer | Pointer to the backend method to be called.
  | backend_selector | Backend selector.
  | server_selector | Server selector.
  [out] | properties | Reference to the collection of retrieved properties.
  | input | Values to be used as input to the backend call.

Exceptions

  db::NoSuchDatabase | if no database matching the given selector was found.

Definition at line 308 of file base_config_backend_pool.h.

References isc::db::BackendSelector::amUnspecified(), backends_, isc_throw, selectBackends(), and isc::db::BackendSelector::toText().

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## ◆ getPropertyPtrConst()

template<typename ConfigBackendType>
template<typename PropertyType, typename... FnPtrArgs, typename... Args>

void isc::cb::BaseConfigBackendPool< ConfigBackendType >::getPropertyPtrConst | ( | PropertyType(ConfigBackendType::* | MethodPointer )(const db::ServerSelector &, FnPtrArgs...) const,
|  | const db::BackendSelector & | backend_selector,
|  | const db::ServerSelector & | server_selector,
|  | PropertyType & | property,
|  | Args... | input ) const
| inlineprotected

Retrieve a single configuration property from the pool.

This is common method for retrieving a single configuration property from the databases. The server specific backends call this method to retrieve a single object. For example, the DHCPv4 configuration backend pool may use this function to implement a `getSubnet4` method:

Subnet4Ptr getSubnet4(const SubnetID& subnet_id,
const BackendSelector& backend_selector,
const ServerSelector& server_selector) const {
Subnet4Ptr subnet;
getPropertyPtrConst<Subnet4Ptr, const SubnetID&>
(&ConfigBackendDHCPv4::getSubnet4, backend_selector,
server_selector, subnet, subnet_id);
return (subnet);
}

where `ConfigBackendDHCPv4::getSubnet4` has the following signature:

Subnet4Ptr getSubnet4(const ServerSelector&, const SubnetID&) const;

If the backend selector is set to "unspecified", this method will iterate over the existing backends and call the `MethodPointer` method on each backend. It will return the first non-null (or non-zero) value returned by this call. For example: if the first backend returns non-null value, this value is returned via `property` argument and the calls for the rest of the backends are skipped.

Template Parameters

  PropertyType | Type of the object returned by the backend call.
  FnPtrArgs | Parameter pack holding argument types of the backend method to be invoked.
  Args | Parameter pack holding types of the arguments provided in the call to this method.

Parameters

  | MethodPointer | Pointer to the backend method to be called.
  | backend_selector | Backend selector.
  | server_selector | Server selector.
  [out] | property | Reference to the shared pointer where retrieved property should be assigned.
  | input | Values to be used as input to the backend call.

Exceptions

  db::NoSuchDatabase | if no database matching the given selector was found.

Definition at line 164 of file base_config_backend_pool.h.

References isc::db::BackendSelector::amUnspecified(), backends_, isc_throw, selectBackends(), and isc::db::BackendSelector::toText().

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## ◆ selectBackends()

template<typename ConfigBackendType>

std::list< ConfigBackendTypePtr > isc::cb::BaseConfigBackendPool< ConfigBackendType >::selectBackends | ( | const db::BackendSelector & | backend_selector | ) | const
| inlineprotected

Selects existing backends matching the selector.

This method selects backends matching the selector. If the selector is "unspecified" or there is no backend in the pool, an empty list is returned.

Parameters

  backend_selector | Selector for which matching backends should be selected.

Definition at line 595 of file base_config_backend_pool.h.

References isc::db::BackendSelector::amUnspecified(), backends_, isc::db::BackendSelector::getBackendHost(), isc::db::BackendSelector::getBackendPort(), isc::db::BackendSelector::getBackendType(), isc::db::BackendSelector::stringToBackendType(), and isc::db::BackendSelector::UNSPEC.

Referenced by createUpdateDeleteBackendProperty(), createUpdateDeleteProperty(), getAllBackendPropertiesConst(), getAllPropertiesConst(), getBackendPropertyPtrConst(), getMultiplePropertiesConst(), and getPropertyPtrConst().

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## Member Data Documentation

## ◆ backends_

template<typename ConfigBackendType>

std::list<ConfigBackendTypePtr> isc::cb::BaseConfigBackendPool< ConfigBackendType >::backends_
| protected

Holds configuration backends belonging to the pool.

Definition at line 643 of file base_config_backend_pool.h.

Referenced by addBackend(), del(), delAllBackends(), delAllBackends(), getAllPropertiesConst(), getMultiplePropertiesConst(), getPropertyPtrConst(), and selectBackends().

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

- base_config_backend_pool.h