Server selector for associating objects in a database with specific servers. More...

#include <server_selector.h>

Public Types
enum class	Type { UNASSIGNED , ALL , SUBSET , ANY }
	Type of the server selection. More...

Public Member Functions
bool	amAll () const
	Convenience method checking if the server selector is "all".

bool	amAny () const
	Convenience method checking if the server selector is "any".

bool	amUnassigned () const
	Convenience method checking if the server selector is "unassigned".

std::set< data::ServerTag >	getTags () const
	Returns tags associated with the selector.

Type	getType () const
	Returns type of the selector.

bool	hasMultipleTags () const
	Convenience method checking if the server selector has multiple tags.

bool	hasNoTags () const
	Convenience method checking if the server selector has no tags.

Static Public Member Functions
static ServerSelector	ALL ()
	Factory returning "all servers" selector.

static ServerSelector	ANY ()
	Factory returning "any server" selector.

static ServerSelector	MULTIPLE (const std::set< std::string > &server_tags)
	Factory returning "multiple servers" selector.

static ServerSelector	ONE (const std::string &server_tag)
	Factory returning selector of one server.

static ServerSelector	UNASSIGNED ()
	Factory returning "unassigned" server selector.

Detailed Description

Server selector for associating objects in a database with specific servers.

Configuration information stored in the configuration backends can be associated with selected servers, all servers or no particular server. For example: a particular subnet definition in the database may be associated with one server or can be shared by multiple servers. In the latter case, a subnet may be associated with a subset of servers or all servers. An administrator may also add the configuration data into the database and do not associate this data with any particular server.

When fetching the configuration data from a database or when storing data in the database there is a need to specify which servers this data is associated with. The ServerSelector class represents such associations.

It includes three modes of selection: UNASSIGNED, ALL and SUBSET and several factory functions making associations described above.

The ServerSelector class should be used in objects derived from BaseConfigBackendPool and in objects derived from BaseConfigBackend to indicate which servers the specific calls exposed by these objects refer to.

Todo: Add server selector for selecting only those configuration elements that are associated with all servers (and not with any particular server tags). Translating this to SQL queries it would probably be an empty or non-existing server tag.

Definition at line 46 of file server_selector.h.

Member Enumeration Documentation

◆ Type

enum class isc::db::ServerSelector::Type

strong

Type of the server selection.

Enumerator
UNASSIGNED
ALL
SUBSET
ANY

Definition at line 50 of file server_selector.h.

Member Function Documentation

◆ ALL()

static ServerSelector isc::db::ServerSelector::ALL ( )

inlinestatic

Factory returning "all servers" selector.

Definition at line 64 of file server_selector.h.

References ALL.

Referenced by isc::process::CBControlBase< ConfigBackendMgrType >::databaseConfigFetch().

◆ amAll()

bool isc::db::ServerSelector::amAll ( ) const

inline

Convenience method checking if the server selector is "all".

Returns: true if the selector is "all", false otherwise.

Definition at line 119 of file server_selector.h.

References ALL, and getType().

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◆ amAny()

bool isc::db::ServerSelector::amAny ( ) const

inline

Convenience method checking if the server selector is "any".

Returns: true if the selector is "any", false otherwise.

Definition at line 126 of file server_selector.h.

References ANY, and getType().

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◆ amUnassigned()

bool isc::db::ServerSelector::amUnassigned ( ) const

inline

Convenience method checking if the server selector is "unassigned".

Returns: true if the selector is "unassigned", false otherwise.

Definition at line 112 of file server_selector.h.

References getType(), and UNASSIGNED.

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◆ ANY()

static ServerSelector isc::db::ServerSelector::ANY ( )

inlinestatic

Factory returning "any server" selector.

Definition at line 84 of file server_selector.h.

References ANY.

◆ getTags()

std::set< data::ServerTag > isc::db::ServerSelector::getTags ( ) const

inline

Returns tags associated with the selector.

Returns: server tags for multiple selections and for one server, empty set for all servers and and unassigned.

Definition at line 98 of file server_selector.h.

◆ getType()

Type isc::db::ServerSelector::getType ( ) const

inline

Returns type of the selector.

Definition at line 90 of file server_selector.h.

Referenced by amAll(), amAny(), and amUnassigned().

◆ hasMultipleTags()

bool isc::db::ServerSelector::hasMultipleTags ( ) const

inline

Convenience method checking if the server selector has multiple tags.

Returns: true if it has multiple tags, false otherwise.

Definition at line 133 of file server_selector.h.

◆ hasNoTags()

bool isc::db::ServerSelector::hasNoTags ( ) const

inline

Convenience method checking if the server selector has no tags.

Returns: true when the server selector has no tags, false otherwise.

Definition at line 105 of file server_selector.h.

◆ MULTIPLE()

ServerSelector isc::db::ServerSelector::MULTIPLE ( const std::set< std::string > & server_tags )

static

Factory returning "multiple servers" selector.

Parameters

server_tags set of server tags to be selected.

Exceptions

InvalidOperation if no server tags provided.

Definition at line 18 of file server_selector.cc.

References isc_throw.

◆ ONE()

static ServerSelector isc::db::ServerSelector::ONE ( const std::string & server_tag )

inlinestatic

Factory returning selector of one server.

Parameters

server_tag tag of the single server to be selected.

Definition at line 72 of file server_selector.h.

Referenced by isc::process::CBControlBase< ConfigBackendMgrType >::databaseConfigFetch().

◆ UNASSIGNED()

static ServerSelector isc::db::ServerSelector::UNASSIGNED ( )

inlinestatic

Factory returning "unassigned" server selector.

Definition at line 58 of file server_selector.h.

References UNASSIGNED.

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

Public Types

Public Member Functions

Static Public Member Functions

Detailed Description

Member Enumeration Documentation

◆ Type

Member Function Documentation

◆ ALL()

◆ amAll()

◆ amAny()

◆ amUnassigned()

◆ ANY()

◆ getTags()

◆ getType()

◆ hasMultipleTags()

◆ hasNoTags()

◆ MULTIPLE()

◆ ONE()

◆ UNASSIGNED()