Holds configuration parameters pertaining to lease expiration and lease affinity. More...

#include <cfg_expiration.h>

Inheritance diagram for isc::dhcp::CfgExpiration:

Public Member Functions
	CfgExpiration (const bool test_mode=false)
	Constructor.

uint16_t	getFlushReclaimedTimerWaitTime () const
	Returns flush-reclaimed-timer-wait-time.

uint32_t	getHoldReclaimedTime () const
	Returns hold-reclaimed-time.

uint32_t	getMaxReclaimLeases () const
	Returns max-reclaim-leases.

uint16_t	getMaxReclaimTime () const
	Returns max-reclaim-time.

uint16_t	getReclaimTimerWaitTime () const
	Returns reclaim-timer-wait-time.

uint16_t	getUnwarnedReclaimCycles () const
	Returns unwarned-reclaim-cycles.

void	setFlushReclaimedTimerWaitTime (const int64_t flush_reclaimed_wait_time)
	Sets flush-reclaimed-timer-wait-time.

void	setHoldReclaimedTime (const int64_t hold_reclaimed_time)
	Sets hold-reclaimed-time.

void	setMaxReclaimLeases (const int64_t max_reclaim_leases)
	Sets max-reclaim-leases.

void	setMaxReclaimTime (const int64_t max_reclaim_time)
	Sets max-reclaim-time.

void	setReclaimTimerWaitTime (const int64_t reclaim_timer_wait_time)
	Sets reclaim-timer-wait-time.

void	setUnwarnedReclaimCycles (const int64_t unwarned_reclaim_cycles)
	Sets unwarned-reclaim-cycles.

template<typename Instance >
void	setupTimers (void(Instance::reclaim_fun)(const size_t, const uint16_t, const bool, const uint16_t), void(Instance::delete_fun)(const uint32_t), Instance *instance_ptr) const
	Setup timers for the reclamation of expired leases according to the configuration parameters.

virtual isc::data::ElementPtr	toElement () const
	Unparse a configuration object.

Public Member Functions inherited from isc::data::CfgToElement
virtual	~CfgToElement ()
	Destructor.

virtual isc::data::ElementPtr	toElement () const =0
	Unparse a configuration object.

Static Public Attributes
Default values.
Default value for reclaim-timer-wait-time.
static const uint16_t	DEFAULT_RECLAIM_TIMER_WAIT_TIME = 10

static const uint16_t	DEFAULT_FLUSH_RECLAIMED_TIMER_WAIT_TIME = 25
	Default value for flush-reclaimed-timer-wait-time.

static const uint32_t	DEFAULT_HOLD_RECLAIMED_TIME = 3600
	Default value for hold-reclaimed-time.

static const uint32_t	DEFAULT_MAX_RECLAIM_LEASES = 100
	Default value for max-reclaim-leases.

static const uint16_t	DEFAULT_MAX_RECLAIM_TIME = 250
	Default value for max-reclaim-time.

static const uint16_t	DEFAULT_UNWARNED_RECLAIM_CYCLES = 5
	Default value for unwarned-reclaim-cycles.

Upper limits for the parameters
Maximum value for reclaim-timer-wait-time.
static const uint16_t	LIMIT_RECLAIM_TIMER_WAIT_TIME

static const uint16_t	LIMIT_FLUSH_RECLAIMED_TIMER_WAIT_TIME
	Maximum value for flush-reclaimed-timer-wait-time.

static const uint32_t	LIMIT_HOLD_RECLAIMED_TIME
	Maximum value for hold-reclaimed-time.

static const uint32_t	LIMIT_MAX_RECLAIM_LEASES
	Maximum value for max-reclaim-leases.

static const uint16_t	LIMIT_MAX_RECLAIM_TIME = 10000
	Default value for max-reclaim-time.

static const uint16_t	LIMIT_UNWARNED_RECLAIM_CYCLES
	Maximum value for unwarned-reclaim-cycles.

Timers' names
static const std::string	RECLAIM_EXPIRED_TIMER_NAME
	Name of the timer for reclaiming expired leases.

static const std::string	FLUSH_RECLAIMED_TIMER_NAME
	Name of the timer for flushing reclaimed leases.

Detailed Description

Holds configuration parameters pertaining to lease expiration and lease affinity.

This class holds the values of the following configuration parameters:

reclaim-timer-wait-time - is the time between two cycles of processing expired leases, expressed in seconds, i.e. the time between the end of one cycle and the beginning of the next cycle. If this value is 0, the expired leases are not processed.
flush-reclaimed-timer-wait-time - is the time between two cycles of recycling "expired-reclaimed" leases, expressed in seconds. If this value is 0, the expired leases are removed by the leases reclamation routine rather than recycling function. The recycling function is not executed and the value of the "hold-reclaimed-time" is ignored.
hold-reclaimed-time -is the time for which "expired-reclaimed" leases are held in the lease database in the "expired-reclaimed" state after they expire. If this time is set to 0, the recycling function is not executed and the value of the "recycle-timer-wait-time" is ignored. This value is expressed in seconds.
max-reclaim-leases - is the maximum number of leases to be processed in a single cycle. If this value is 0, all expired leases are processed in a single cycle, unless the maximum processing time (configured with the "max-time") parameter elapses first.
max-reclaim-time - the maximum time that a single processing cycle may last, expressed in milliseconds. If this value is 0, there is no limitation for the maximum processing time. This value is expressed in milliseconds.
unwarned-reclaim-cycles - is the number of consecutive processing cycles of expired leases, after which the system issues a warning if there are still expired leases in the database. If this value is 0, the warning is never issued.

The CfgExpiration class provides a collection of accessors and modifiers to manage the data. Each accessor checks if the given value is in range allowed for this value.

Definition at line 61 of file cfg_expiration.h.

Constructor & Destructor Documentation

◆ CfgExpiration()

isc::dhcp::CfgExpiration::CfgExpiration ( const bool test_mode = false )

Constructor.

Sets all parameters to their defaults.

Parameters

test_mode Indicates if the instance should be created in the test mode. In this mode the intervals for the timers are considered to be specified in milliseconds, rather than seconds. This facilitates testing execution of timers without the delays.

Definition at line 46 of file cfg_expiration.cc.

Member Function Documentation

◆ getFlushReclaimedTimerWaitTime()

uint16_t isc::dhcp::CfgExpiration::getFlushReclaimedTimerWaitTime ( ) const

inline

Returns flush-reclaimed-timer-wait-time.

Definition at line 142 of file cfg_expiration.h.

Referenced by setupTimers().

◆ getHoldReclaimedTime()

uint32_t isc::dhcp::CfgExpiration::getHoldReclaimedTime ( ) const

inline

Returns hold-reclaimed-time.

Definition at line 152 of file cfg_expiration.h.

Referenced by setupTimers().

◆ getMaxReclaimLeases()

uint32_t isc::dhcp::CfgExpiration::getMaxReclaimLeases ( ) const

inline

Returns max-reclaim-leases.

Definition at line 162 of file cfg_expiration.h.

Referenced by setupTimers().

◆ getMaxReclaimTime()

uint16_t isc::dhcp::CfgExpiration::getMaxReclaimTime ( ) const

inline

Returns max-reclaim-time.

Definition at line 172 of file cfg_expiration.h.

Referenced by setupTimers().

◆ getReclaimTimerWaitTime()

uint16_t isc::dhcp::CfgExpiration::getReclaimTimerWaitTime ( ) const

inline

Returns reclaim-timer-wait-time.

Definition at line 132 of file cfg_expiration.h.

Referenced by setupTimers().

◆ getUnwarnedReclaimCycles()

uint16_t isc::dhcp::CfgExpiration::getUnwarnedReclaimCycles ( ) const

inline

Returns unwarned-reclaim-cycles.

Definition at line 182 of file cfg_expiration.h.

Referenced by setupTimers().

◆ setFlushReclaimedTimerWaitTime()

void isc::dhcp::CfgExpiration::setFlushReclaimedTimerWaitTime ( const int64_t flush_reclaimed_wait_time )

Sets flush-reclaimed-timer-wait-time.

Parameters

flush_reclaimed_wait_time New value.

Definition at line 65 of file cfg_expiration.cc.

References LIMIT_FLUSH_RECLAIMED_TIMER_WAIT_TIME.

◆ setHoldReclaimedTime()

void isc::dhcp::CfgExpiration::setHoldReclaimedTime ( const int64_t hold_reclaimed_time )

Sets hold-reclaimed-time.

Parameters

hold_reclaimed_time New value.

Definition at line 72 of file cfg_expiration.cc.

References LIMIT_HOLD_RECLAIMED_TIME.

◆ setMaxReclaimLeases()

void isc::dhcp::CfgExpiration::setMaxReclaimLeases ( const int64_t max_reclaim_leases )

Sets max-reclaim-leases.

Parameters

max_reclaim_leases New value.

Definition at line 78 of file cfg_expiration.cc.

References LIMIT_MAX_RECLAIM_LEASES.

◆ setMaxReclaimTime()

void isc::dhcp::CfgExpiration::setMaxReclaimTime ( const int64_t max_reclaim_time )

Sets max-reclaim-time.

Parameters

max_reclaim_time New value.

Definition at line 84 of file cfg_expiration.cc.

References LIMIT_MAX_RECLAIM_TIME.

◆ setReclaimTimerWaitTime()

void isc::dhcp::CfgExpiration::setReclaimTimerWaitTime ( const int64_t reclaim_timer_wait_time )

Sets reclaim-timer-wait-time.

Parameters

reclaim_timer_wait_time New value.

Definition at line 58 of file cfg_expiration.cc.

References LIMIT_RECLAIM_TIMER_WAIT_TIME.

◆ setUnwarnedReclaimCycles()

void isc::dhcp::CfgExpiration::setUnwarnedReclaimCycles ( const int64_t unwarned_reclaim_cycles )

Sets unwarned-reclaim-cycles.

Parameters

unwarned_reclaim_cycles New value.

Definition at line 90 of file cfg_expiration.cc.

References LIMIT_UNWARNED_RECLAIM_CYCLES.

◆ setupTimers()

template<typename Instance >

void isc::dhcp::CfgExpiration::setupTimers	(	void(Instance::*)(const size_t, const uint16_t, const bool, const uint16_t)	reclaim_fun,
		void(Instance::*)(const uint32_t)	delete_fun,
		Instance *	instance_ptr
	)		const

Setup timers for the reclamation of expired leases according to the configuration parameters.

This method includes the logic for setting the interval timers performing the reclamation of the expired leases and the removal of expired-reclaimed leases.

The following is the sample code illustrating how to call this function to setup the leases reclamation for the DHCPv4 server.

CfgExpiration cfg;
 
(set some cfg values here)
 
AllocEnginePtr alloc_engine(new AllocEngine(...));
cfg.setupTimers(&AllocEngine::reclaimExpiredLeases4,
                &AllocEngine::deleteExpiredReclaimedLeases4,
                alloc_engine.get());

Parameters

reclaim_fun	Pointer to the leases reclamation routine.
delete_fun	Pointer to the function which removes the expired-reclaimed leases from the lease database.
instance_ptr	Pointer to the instance of the object which implements the lease reclamation routine. Typically it will be the pointer to the `AllocEngine`. In case of unit tests it will be a pointer to some test class which provides stub implementation of the leases reclamation routines.

Template Parameters

Instance Instance of the object in which both functions are implemented.

Definition at line 284 of file cfg_expiration.h.

References FLUSH_RECLAIMED_TIMER_NAME, getFlushReclaimedTimerWaitTime(), getHoldReclaimedTime(), getMaxReclaimLeases(), getMaxReclaimTime(), getReclaimTimerWaitTime(), getUnwarnedReclaimCycles(), isc::asiolink::IntervalTimer::ONE_SHOT, and RECLAIM_EXPIRED_TIMER_NAME.

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◆ toElement()

ElementPtr isc::dhcp::CfgExpiration::toElement ( ) const

virtual

Unparse a configuration object.

Returns: a pointer to unparsed configuration

Implements isc::data::CfgToElement.

Definition at line 111 of file cfg_expiration.cc.

References isc::data::Element::create(), and isc::data::Element::createMap().

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Member Data Documentation

◆ DEFAULT_FLUSH_RECLAIMED_TIMER_WAIT_TIME

const uint16_t isc::dhcp::CfgExpiration::DEFAULT_FLUSH_RECLAIMED_TIMER_WAIT_TIME = 25

static

Default value for flush-reclaimed-timer-wait-time.

Definition at line 71 of file cfg_expiration.h.

◆ DEFAULT_HOLD_RECLAIMED_TIME

const uint32_t isc::dhcp::CfgExpiration::DEFAULT_HOLD_RECLAIMED_TIME = 3600

static

Default value for hold-reclaimed-time.

Definition at line 74 of file cfg_expiration.h.

◆ DEFAULT_MAX_RECLAIM_LEASES

const uint32_t isc::dhcp::CfgExpiration::DEFAULT_MAX_RECLAIM_LEASES = 100

static

Default value for max-reclaim-leases.

Definition at line 77 of file cfg_expiration.h.

◆ DEFAULT_MAX_RECLAIM_TIME

const uint16_t isc::dhcp::CfgExpiration::DEFAULT_MAX_RECLAIM_TIME = 250

static

Default value for max-reclaim-time.

Definition at line 80 of file cfg_expiration.h.

◆ DEFAULT_RECLAIM_TIMER_WAIT_TIME

const uint16_t isc::dhcp::CfgExpiration::DEFAULT_RECLAIM_TIMER_WAIT_TIME = 10

static

Definition at line 68 of file cfg_expiration.h.

◆ DEFAULT_UNWARNED_RECLAIM_CYCLES

const uint16_t isc::dhcp::CfgExpiration::DEFAULT_UNWARNED_RECLAIM_CYCLES = 5

static

Default value for unwarned-reclaim-cycles.

Definition at line 83 of file cfg_expiration.h.

◆ FLUSH_RECLAIMED_TIMER_NAME

const std::string isc::dhcp::CfgExpiration::FLUSH_RECLAIMED_TIMER_NAME

static

Initial value:

=

"flush-reclaimed-leases"

Name of the timer for flushing reclaimed leases.

Definition at line 117 of file cfg_expiration.h.

Referenced by setupTimers().

◆ LIMIT_FLUSH_RECLAIMED_TIMER_WAIT_TIME

const uint16_t isc::dhcp::CfgExpiration::LIMIT_FLUSH_RECLAIMED_TIMER_WAIT_TIME

static

Initial value:

=

std::numeric_limits<uint16_t>::max()

Maximum value for flush-reclaimed-timer-wait-time.

Definition at line 94 of file cfg_expiration.h.

Referenced by setFlushReclaimedTimerWaitTime().

◆ LIMIT_HOLD_RECLAIMED_TIME

const uint32_t isc::dhcp::CfgExpiration::LIMIT_HOLD_RECLAIMED_TIME

static

Initial value:

=

std::numeric_limits<uint32_t>::max()

Maximum value for hold-reclaimed-time.

Definition at line 97 of file cfg_expiration.h.

Referenced by setHoldReclaimedTime().

◆ LIMIT_MAX_RECLAIM_LEASES

const uint32_t isc::dhcp::CfgExpiration::LIMIT_MAX_RECLAIM_LEASES

static

Initial value:

=

std::numeric_limits<uint32_t>::max()

Maximum value for max-reclaim-leases.

Definition at line 100 of file cfg_expiration.h.

Referenced by setMaxReclaimLeases().

◆ LIMIT_MAX_RECLAIM_TIME

const uint16_t isc::dhcp::CfgExpiration::LIMIT_MAX_RECLAIM_TIME = 10000

static

Default value for max-reclaim-time.

Definition at line 103 of file cfg_expiration.h.

Referenced by setMaxReclaimTime().

◆ LIMIT_RECLAIM_TIMER_WAIT_TIME

const uint16_t isc::dhcp::CfgExpiration::LIMIT_RECLAIM_TIMER_WAIT_TIME

static

Initial value:

=

std::numeric_limits<uint16_t>::max()

Definition at line 91 of file cfg_expiration.h.

Referenced by setReclaimTimerWaitTime().

◆ LIMIT_UNWARNED_RECLAIM_CYCLES

const uint16_t isc::dhcp::CfgExpiration::LIMIT_UNWARNED_RECLAIM_CYCLES

static

Initial value:

=

std::numeric_limits<uint16_t>::max()

Maximum value for unwarned-reclaim-cycles.

Definition at line 106 of file cfg_expiration.h.

Referenced by setUnwarnedReclaimCycles().

◆ RECLAIM_EXPIRED_TIMER_NAME

const std::string isc::dhcp::CfgExpiration::RECLAIM_EXPIRED_TIMER_NAME

static

Initial value:

=

"reclaim-expired-leases"

Name of the timer for reclaiming expired leases.

Definition at line 114 of file cfg_expiration.h.

Referenced by setupTimers().

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

Public Member Functions

Static Public Attributes

Detailed Description

Constructor & Destructor Documentation

◆ CfgExpiration()

Member Function Documentation

◆ getFlushReclaimedTimerWaitTime()

◆ getHoldReclaimedTime()

◆ getMaxReclaimLeases()

◆ getMaxReclaimTime()

◆ getReclaimTimerWaitTime()

◆ getUnwarnedReclaimCycles()

◆ setFlushReclaimedTimerWaitTime()

◆ setHoldReclaimedTime()

◆ setMaxReclaimLeases()

◆ setMaxReclaimTime()

◆ setReclaimTimerWaitTime()

◆ setUnwarnedReclaimCycles()

◆ setupTimers()

◆ toElement()

Member Data Documentation

◆ DEFAULT_FLUSH_RECLAIMED_TIMER_WAIT_TIME

◆ DEFAULT_HOLD_RECLAIMED_TIME

◆ DEFAULT_MAX_RECLAIM_LEASES

◆ DEFAULT_MAX_RECLAIM_TIME

◆ DEFAULT_RECLAIM_TIMER_WAIT_TIME

◆ DEFAULT_UNWARNED_RECLAIM_CYCLES

◆ FLUSH_RECLAIMED_TIMER_NAME

◆ LIMIT_FLUSH_RECLAIMED_TIMER_WAIT_TIME

◆ LIMIT_HOLD_RECLAIMED_TIME

◆ LIMIT_MAX_RECLAIM_LEASES

◆ LIMIT_MAX_RECLAIM_TIME

◆ LIMIT_RECLAIM_TIMER_WAIT_TIME

◆ LIMIT_UNWARNED_RECLAIM_CYCLES

◆ RECLAIM_EXPIRED_TIMER_NAME