represents a CS replacement policy More...

#include <cs-policy.hpp>

Inheritance diagram for nfd::cs::Policy:

Collaboration diagram for nfd::cs::Policy:

Public Member Functions
	Policy (const std::string &policyName)

virtual	~Policy ()=default

const std::string &	getName () const

Cs *	getCs () const
	gets cs More...

void	setCs (Cs *cs)
	sets cs More...

size_t	getLimit () const
	gets hard limit (in number of entries) More...

void	setLimit (size_t nMaxEntries)
	sets hard limit (in number of entries) More...

void	afterInsert (iterator i)
	invoked by CS after a new entry is inserted More...

void	afterRefresh (iterator i)
	invoked by CS after an existing entry is refreshed by same Data More...

void	beforeErase (iterator i)
	invoked by CS before an entry is erased due to management command More...

void	beforeUse (iterator i)
	invoked by CS before an entry is used to match a lookup More...

Static Public Member Functions
template<typename P >
static void	registerPolicy (const std::string &policyName=P::POLICY_NAME)

static unique_ptr< Policy >	create (const std::string &policyName)

static std::set< std::string >	getPolicyNames ()

Public Attributes
signal::Signal< Policy, iterator >	beforeEvict
	emits when an entry is being evicted More...

Protected Member Functions
virtual void	doAfterInsert (iterator i)=0
	invoked after a new entry is created in CS More...

virtual void	doAfterRefresh (iterator i)=0
	invoked after an existing entry is refreshed by same Data More...

virtual void	doBeforeErase (iterator i)=0
	invoked before an entry is erased due to management command More...

virtual void	doBeforeUse (iterator i)=0
	invoked before an entry is used to match a lookup More...

virtual void	evictEntries ()=0
	evicts zero or more entries More...

Detailed Description

represents a CS replacement policy

Definition at line 39 of file cs-policy.hpp.

Constructor & Destructor Documentation

nfd::cs::Policy::Policy ( const std::string & policyName )

explicit

Definition at line 61 of file cs-policy.cpp.

Referenced by registerPolicy().

virtual nfd::cs::Policy::~Policy ( )

virtualdefault

Referenced by registerPolicy().

Member Function Documentation

template<typename P >

static void nfd::cs::Policy::registerPolicy ( const std::string & policyName = P::POLICY_NAME )

inlinestatic

Definition at line 44 of file cs-policy.hpp.

References create(), getCs(), getLimit(), getName(), getPolicyNames(), Policy(), setCs(), setLimit(), and ~Policy().

unique_ptr< Policy > nfd::cs::Policy::create ( const std::string & policyName )

static

Returns: a cs::Policy identified by policyName, or nullptr if policyName is unknown

Definition at line 45 of file cs-policy.cpp.

Referenced by nfd::TablesConfigSection::ensureConfigured(), nfd::cs::makeDefaultPolicy(), and registerPolicy().

std::set< std::string > nfd::cs::Policy::getPolicyNames ( )

static

Returns: a list of available policy names

Definition at line 53 of file cs-policy.cpp.

Referenced by registerPolicy().

const std::string & nfd::cs::Policy::getName ( ) const

inline

Definition at line 193 of file cs-policy.hpp.

Referenced by registerPolicy().

Cs * nfd::cs::Policy::getCs ( ) const

inline

gets cs

Definition at line 199 of file cs-policy.hpp.

Referenced by nfd::cs::lru::LruPolicy::LruPolicy(), registerPolicy(), and nfd::cs::priority_fifo::PriorityFifoPolicy::~PriorityFifoPolicy().

void nfd::cs::Policy::setCs ( Cs * cs )

inline

sets cs

Definition at line 205 of file cs-policy.hpp.

Referenced by registerPolicy().

size_t nfd::cs::Policy::getLimit ( ) const

inline

gets hard limit (in number of entries)

Definition at line 211 of file cs-policy.hpp.

Referenced by nfd::cs::lru::LruPolicy::LruPolicy(), registerPolicy(), and nfd::cs::priority_fifo::PriorityFifoPolicy::~PriorityFifoPolicy().

void nfd::cs::Policy::setLimit ( size_t nMaxEntries )

sets hard limit (in number of entries)

Postcondition: getLimit() == nMaxEntries; cs.size() <= getLimit()

The policy may evict entries if necessary.

Definition at line 67 of file cs-policy.cpp.

References evictEntries(), and NFD_LOG_INFO.

Referenced by registerPolicy().

void nfd::cs::Policy::afterInsert ( iterator i )

invoked by CS after a new entry is inserted

Postcondition: cs.size() <= getLimit()

The policy may evict entries if necessary. During this process, i might be evicted.

Definition at line 75 of file cs-policy.cpp.

References doAfterInsert().

void nfd::cs::Policy::afterRefresh ( iterator i )

invoked by CS after an existing entry is refreshed by same Data

The policy may witness this refresh to make better eviction decisions in the future.

Definition at line 82 of file cs-policy.cpp.

References doAfterRefresh().

void nfd::cs::Policy::beforeErase ( iterator i )

invoked by CS before an entry is erased due to management command

Warning: CS must not invoke this method if an entry is erased due to eviction.

Definition at line 89 of file cs-policy.cpp.

References doBeforeErase().

void nfd::cs::Policy::beforeUse ( iterator i )

invoked by CS before an entry is used to match a lookup

The policy may witness this usage to make better eviction decisions in the future.

Definition at line 96 of file cs-policy.cpp.

References doBeforeUse().

virtual void nfd::cs::Policy::doAfterInsert ( iterator i )

protectedpure virtual

invoked after a new entry is created in CS

When overridden in a subclass, a policy implementation should decide whether to accept i. If i is accepted, it should be inserted into a cleanup index. Otherwise, beforeEvict signal should be emitted with i to inform CS to erase the entry. A policy implementation may decide to evict other entries by emitting beforeEvict signal, in order to keep CS size under limit.

Referenced by afterInsert().

virtual void nfd::cs::Policy::doAfterRefresh ( iterator i )

protectedpure virtual

invoked after an existing entry is refreshed by same Data

When overridden in a subclass, a policy implementation may witness this operation and adjust its cleanup index.

Referenced by afterRefresh().

virtual void nfd::cs::Policy::doBeforeErase ( iterator i )

protectedpure virtual

invoked before an entry is erased due to management command

Note: This will not be invoked for an entry being evicted by policy.

When overridden in a subclass, a policy implementation should erase i from its cleanup index without emitted afterErase signal.

Referenced by beforeErase().

virtual void nfd::cs::Policy::doBeforeUse ( iterator i )

protectedpure virtual

invoked before an entry is used to match a lookup

When overridden in a subclass, a policy implementation may witness this operation and adjust its cleanup index.

Referenced by beforeUse().

virtual void nfd::cs::Policy::evictEntries ( )

protectedpure virtual

evicts zero or more entries

Postcondition: CS size does not exceed hard limit

Referenced by setLimit().

Member Data Documentation

signal::Signal<Policy, iterator> nfd::cs::Policy::beforeEvict

emits when an entry is being evicted

A policy implementation should emit this signal to cause CS to erase the entry from its index. CS should connect to this signal and erase the entry upon signal emission.

Definition at line 102 of file cs-policy.hpp.

Referenced by nfd::cs::lru::LruPolicy::LruPolicy(), and nfd::cs::priority_fifo::PriorityFifoPolicy::~PriorityFifoPolicy().

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

ndnSIM/NFD/daemon/table/cs-policy.hpp
ndnSIM/NFD/daemon/table/cs-policy.cpp

Public Member Functions

Static Public Member Functions

Public Attributes

Protected Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation