isc::dhcp::RandomAllocator Class Reference

An allocator offering addresses in a random order. More...

#include <random_allocator.h>

Inheritance diagram for isc::dhcp::RandomAllocator:

Public Member Functions
	RandomAllocator (Lease::Type type, const WeakSubnetPtr &subnet)
	Constructor.
virtual std::string	getType () const
	Returns the allocator type string.
Public Member Functions inherited from isc::dhcp::Allocator
	Allocator (Lease::Type type, const WeakSubnetPtr &subnet)
	Constructor.
virtual	~Allocator ()
	Virtual destructor.
virtual std::string	getType () const =0
	Returns allocator type string.
void	initAfterConfigure ()
	Performs allocator initialization after server's reconfiguration.
virtual isc::asiolink::IOAddress	pickAddress (const ClientClasses &client_classes, const IdentifierBaseTypePtr &duid, const asiolink::IOAddress &hint)
	Picks an address.
virtual isc::asiolink::IOAddress	pickPrefix (const ClientClasses &client_classes, Pool6Ptr &pool, const IdentifierBaseTypePtr &duid, PrefixLenMatchType prefix_length_match, const asiolink::IOAddress &hint, uint8_t hint_prefix_length)
	Picks a delegated prefix.

Additional Inherited Members
Public Types inherited from isc::dhcp::Allocator
enum	PrefixLenMatchType { PREFIX_LEN_EQUAL , PREFIX_LEN_LOWER , PREFIX_LEN_HIGHER }
	Type of preferred PD-pool prefix length selection criteria. More...
Static Public Member Functions inherited from isc::dhcp::Allocator
static bool	isValidPrefixPool (Allocator::PrefixLenMatchType prefix_length_match, PoolPtr pool, uint8_t hint_prefix_length)
	Check if the pool matches the selection criteria relative to the provided hint prefix length.
Protected Member Functions inherited from isc::dhcp::Allocator
virtual void	initAfterConfigureInternal ()
	Allocator-specific initialization function.
Protected Attributes inherited from isc::dhcp::Allocator
bool	inited_
	Indicates if the allocator has been initialized.
std::mutex	mutex_
	The mutex to protect the allocated lease.
Lease::Type	pool_type_
	Defines pool type allocation.
WeakSubnetPtr	subnet_
	Weak pointer to the subnet owning the allocator.
SubnetID	subnet_id_
	ID of a subnet to which the allocator belongs.

Detailed Description

An allocator offering addresses in a random order.

This allocator uses IPRangePermutation to select random addresses or delegated prefixes from the pools. It guarantees that all offered addresses are unique (do not repeat).

The allocator also randomly picks pools to ensure that the leases are offered uniformly from the entire subnet rather than from the same pool until it exhausts. When all pools exhaust, the allocator resets their permutations and begins offering leases from these pools again.

Definition at line 30 of file random_allocator.h.

Constructor & Destructor Documentation

RandomAllocator()

isc::dhcp::RandomAllocator::RandomAllocator	(	Lease::Type	type,
		const WeakSubnetPtr &	subnet
	)

Constructor.

Parameters

type	specifies the type of allocated leases.
subnet	weak pointer to the subnet owning the allocator.

Definition at line 20 of file random_allocator.cc.

Member Function Documentation

getType()

virtual std::string isc::dhcp::RandomAllocator::getType ( ) const

inlinevirtual

Returns the allocator type string.

Returns

random string.

Implements isc::dhcp::Allocator.

Definition at line 42 of file random_allocator.h.

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

• random_allocator.h
• random_allocator.cc