Adaptive SRTT-based Forwarding Strategy.
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#include <daemon/fw/asf-strategy.hpp>
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| AsfStrategy (Forwarder &forwarder, const Name &name=getStrategyName()) |
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virtual void | afterContentStoreHit (const shared_ptr< pit::Entry > &pitEntry, const Face &inFace, const Data &data) |
| trigger after a Data is matched in CS More...
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virtual void | afterReceiveData (const shared_ptr< pit::Entry > &pitEntry, const Face &inFace, const Data &data) |
| trigger after Data is received More...
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void | afterReceiveInterest (const Face &inFace, const Interest &interest, const shared_ptr< pit::Entry > &pitEntry) override |
| trigger after Interest is received More...
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void | afterReceiveNack (const Face &inFace, const lp::Nack &nack, const shared_ptr< pit::Entry > &pitEntry) override |
| trigger after Nack is received More...
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void | beforeSatisfyInterest (const shared_ptr< pit::Entry > &pitEntry, const Face &inFace, const Data &data) override |
| trigger before PIT entry is satisfied More...
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const Name & | getInstanceName () const |
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virtual void | onDroppedInterest (const Face &outFace, const Interest &interest) |
| trigger after Interest dropped for exceeding allowed retransmissions More...
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Face * | getFace (FaceId id) const |
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const FaceTable & | getFaceTable () const |
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MeasurementsAccessor & | getMeasurements () |
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const fib::Entry & | lookupFib (const pit::Entry &pitEntry) const |
| performs a FIB lookup, considering Link object if present More...
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void | rejectPendingInterest (const shared_ptr< pit::Entry > &pitEntry) |
| schedule the PIT entry for immediate deletion More...
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void | sendData (const shared_ptr< pit::Entry > &pitEntry, const Data &data, const Face &outFace) |
| send data to outFace More...
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void | sendDataToAll (const shared_ptr< pit::Entry > &pitEntry, const Face &inFace, const Data &data) |
| send data to all matched and qualified faces More...
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void | sendInterest (const shared_ptr< pit::Entry > &pitEntry, Face &outFace, const Interest &interest) |
| send Interest to outFace More...
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void | sendNack (const shared_ptr< pit::Entry > &pitEntry, const Face &outFace, const lp::NackHeader &header) |
| send Nack to outFace More...
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void | sendNacks (const shared_ptr< pit::Entry > &pitEntry, const lp::NackHeader &header, std::initializer_list< const Face * > exceptFaces=std::initializer_list< const Face * >()) |
| send Nack to every face that has an in-record, except those in exceptFaces More...
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void | setExpiryTimer (const shared_ptr< pit::Entry > &pitEntry, time::milliseconds duration) |
| Schedule the PIT entry to be erased after duration . More...
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void | setInstanceName (const Name &name) |
| set strategy instance name More...
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Adaptive SRTT-based Forwarding Strategy.
- See also
- Vince Lehman, Ashlesh Gawande, Rodrigo Aldecoa, Dmitri Krioukov, Beichuan Zhang, Lixia Zhang, and Lan Wang, "An Experimental Investigation of Hyperbolic Routing with a Smart Forwarding Plane in NDN," NDN Technical Report NDN-0042, 2016. http://named-data.net/techreports.html
Definition at line 44 of file asf-strategy.hpp.
void nfd::fw::Strategy::afterContentStoreHit |
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const shared_ptr< pit::Entry > & |
pitEntry, |
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const Face & |
inFace, |
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const Data & |
data |
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) |
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virtualinherited |
trigger after a Data is matched in CS
In the base class this method sends data
to inFace
Definition at line 161 of file strategy.cpp.
void nfd::fw::Strategy::afterReceiveData |
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const shared_ptr< pit::Entry > & |
pitEntry, |
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const Face & |
inFace, |
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const Data & |
data |
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) |
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virtualinherited |
trigger after Data is received
This trigger is invoked when an incoming Data satisfies exactly one PIT entry, and gives the strategy full control over Data forwarding.
When this trigger is invoked:
- The Data has been verified to satisfy the PIT entry.
- The PIT entry expiry timer is set to now
Within this function:
- A strategy should return Data to downstream nodes via
sendData
or sendDataToAll
.
- A strategy can modify the Data as long as it still satisfies the PIT entry, such as adding or removing congestion marks.
- A strategy can delay Data forwarding by prolonging the PIT entry lifetime via
setExpiryTimer
, and forward Data before the PIT entry is erased.
- A strategy can collect measurements about the upstream.
- A strategy can collect responses from additional upstream nodes by prolonging the PIT entry lifetime via
setExpiryTimer
every time a Data is received. Note that only one Data should be returned to each downstream node.
In the base class this method invokes beforeSatisfyInterest
trigger and then returns the Data to downstream faces via sendDataToAll
.
Reimplemented in nfd::fw::SelfLearningStrategy.
Definition at line 171 of file strategy.cpp.
void nfd::fw::asf::AsfStrategy::afterReceiveInterest |
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const Face & |
inFace, |
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const Interest & |
interest, |
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const shared_ptr< pit::Entry > & |
pitEntry |
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) |
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overridevirtual |
trigger after Interest is received
The Interest:
- does not violate Scope
- is not looped
- cannot be satisfied by ContentStore
- is under a namespace managed by this strategy
The PIT entry is set to expire after InterestLifetime has elapsed at each downstream.
The strategy should decide whether and where to forward this Interest.
- If the strategy decides to forward this Interest, invoke
sendInterest
for each upstream, either now or shortly after via a scheduler event, but before PIT entry expires. Optionally, the strategy can invoke setExpiryTimer
to adjust how long it would wait for a response.
- If the strategy has already forwarded this Interest previously and decides to continue waiting, do nothing. Optionally, the strategy can invoke
setExpiryTimer
to adjust how long it would wait for a response.
- If the strategy concludes that this Interest cannot be satisfied, invoke
rejectPendingInterest
to erase the PIT entry.
- Warning
- The strategy must not retain shared_ptr<pit::Entry>, otherwise undefined behavior may occur. However, the strategy is allowed to store weak_ptr<pit::Entry>.
Implements nfd::fw::Strategy.
Definition at line 110 of file asf-strategy.cpp.
void nfd::fw::asf::AsfStrategy::afterReceiveNack |
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const Face & |
inFace, |
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const lp::Nack & |
nack, |
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const shared_ptr< pit::Entry > & |
pitEntry |
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) |
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overridevirtual |
trigger after Nack is received
This trigger is invoked when an incoming Nack is received in response to an forwarded Interest. The Nack has been confirmed to be a response to the last Interest forwarded to that upstream, i.e. the PIT out-record exists and has a matching Nonce. The NackHeader has been recorded in the PIT out-record.
If the PIT entry is not yet satisfied, its expiry timer remains unchanged. Otherwise, the PIT entry normally would expire immediately after this function returns.
If the strategy wishes to collect responses from additional upstream nodes, it should invoke setExpiryTimer
within this function to retain the PIT entry. If a Nack arrives from another upstream during the extended PIT entry lifetime, this trigger will be invoked again. At that time, this function must invoke setExpiryTimer
again to continue collecting more responses.
In the base class this method does nothing.
- Warning
- The strategy must not retain shared_ptr<pit::Entry>, otherwise undefined behavior may occur. However, the strategy is allowed to store weak_ptr<pit::Entry>.
Reimplemented from nfd::fw::Strategy.
Definition at line 185 of file asf-strategy.cpp.
bool nfd::fw::Strategy::areSameType |
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const Name & |
instanceNameA, |
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const Name & |
instanceNameB |
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) |
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staticinherited |
- Returns
- whether
instanceNameA
and instanceNameA
will initiate same strategy type
Definition at line 107 of file strategy.cpp.
void nfd::fw::asf::AsfStrategy::beforeSatisfyInterest |
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const shared_ptr< pit::Entry > & |
pitEntry, |
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const Face & |
inFace, |
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const Data & |
data |
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) |
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overridevirtual |
trigger before PIT entry is satisfied
This trigger is invoked when an incoming Data satisfies more than one PIT entry. The strategy can collect measurements information, but cannot manipulate Data forwarding. When an incoming Data satisfies only one PIT entry, afterReceiveData
is invoked instead and given full control over Data forwarding. If a strategy does not override afterReceiveData
, the default implementation invokes beforeSatisfyInterest
.
Normally, PIT entries would be erased after receiving the first matching Data. If the strategy wishes to collect responses from additional upstream nodes, it should invoke setExpiryTimer
within this function to prolong the PIT entry lifetime. If a Data arrives from another upstream during the extended PIT entry lifetime, this trigger will be invoked again. At that time, this function must invoke setExpiryTimer
again to continue collecting more responses.
In this base class this method does nothing.
- Warning
- The strategy must not retain shared_ptr<pit::Entry>, otherwise undefined behavior may occur. However, the strategy is allowed to store weak_ptr<pit::Entry>.
Reimplemented from nfd::fw::Strategy.
Definition at line 159 of file asf-strategy.cpp.
bool nfd::fw::Strategy::canCreate |
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const Name & |
instanceName | ) |
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staticinherited |
- Returns
- whether a strategy instance can be created from
instanceName
- Parameters
-
instanceName | strategy instance name, may contain version and parameters |
- Note
- This function finds a strategy type using same rules as
create
, but does not attempt to construct an instance.
Definition at line 85 of file strategy.cpp.
unique_ptr< Strategy > nfd::fw::Strategy::create |
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const Name & |
instanceName, |
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Forwarder & |
forwarder |
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) |
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staticinherited |
- Returns
- a strategy instance created from
instanceName
- Return values
-
nullptr | if !canCreate(instanceName) |
- Exceptions
-
std::invalid_argument | strategy type constructor does not accept specified version or parameters |
Definition at line 91 of file strategy.cpp.
Face* nfd::fw::Strategy::getFace |
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FaceId |
id | ) |
const |
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inlineprotectedinherited |
const FaceTable& nfd::fw::Strategy::getFaceTable |
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const |
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inlineprotectedinherited |
const Name& nfd::fw::Strategy::getInstanceName |
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const |
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inlineinherited |
- Returns
- strategy instance name
The instance name is assigned during instantiation. It contains a version component, and may have extra parameter components.
Definition at line 110 of file strategy.hpp.
MeasurementsAccessor& nfd::fw::Strategy::getMeasurements |
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inlineprotectedinherited |
const Name & nfd::fw::asf::AsfStrategy::getStrategyName |
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static |
std::set< Name > nfd::fw::Strategy::listRegistered |
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staticinherited |
- Returns
- registered versioned strategy names
Definition at line 113 of file strategy.cpp.
performs a FIB lookup, considering Link object if present
Definition at line 253 of file strategy.cpp.
Name nfd::fw::Strategy::makeInstanceName |
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const Name & |
input, |
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const Name & |
strategyName |
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staticprotectedinherited |
construct a strategy instance name
- Parameters
-
input | strategy instance name, may contain version and parameters |
strategyName | strategy name with version but without parameters; typically this should be getStrategyName() |
If input
contains a version component, return input
unchanged. Otherwise, return input
plus the version component taken from strategyName
. This allows a strategy instance to be constructed with an unversioned name, but its final instance name should contain the version.
Definition at line 133 of file strategy.cpp.
void nfd::fw::Strategy::onDroppedInterest |
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const Face & |
outFace, |
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const Interest & |
interest |
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virtualinherited |
trigger after Interest dropped for exceeding allowed retransmissions
In the base class this method does nothing.
Definition at line 191 of file strategy.cpp.
parse a strategy instance name
- Parameters
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input | strategy instance name, may contain version and parameters |
- Exceptions
-
std::invalid_argument | input format is unacceptable |
Definition at line 122 of file strategy.cpp.
template<typename S >
static void nfd::fw::Strategy::registerType |
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const Name & |
strategyName = S::getStrategyName() | ) |
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inlinestaticinherited |
register a strategy type
- Template Parameters
-
- Parameters
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strategyName | strategy program name, must contain version |
- Note
- It is permitted to register the same strategy type under multiple names, which is useful in tests and for creating aliases.
Definition at line 48 of file strategy.hpp.
void nfd::fw::Strategy::rejectPendingInterest |
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const shared_ptr< pit::Entry > & |
pitEntry | ) |
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inlineprotectedinherited |
schedule the PIT entry for immediate deletion
This helper function sets the PIT entry expiry time to zero. The strategy should invoke this function when it concludes that the Interest cannot be forwarded and it does not want to wait for responses from existing upstream nodes.
Definition at line 273 of file strategy.hpp.
void nfd::fw::Strategy::sendData |
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const shared_ptr< pit::Entry > & |
pitEntry, |
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const Data & |
data, |
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const Face & |
outFace |
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) |
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protectedinherited |
send data
to outFace
- Parameters
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pitEntry | PIT entry |
data | the Data packet |
outFace | face through which to send out the Data |
Definition at line 197 of file strategy.cpp.
void nfd::fw::Strategy::sendDataToAll |
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const shared_ptr< pit::Entry > & |
pitEntry, |
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const Face & |
inFace, |
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const Data & |
data |
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) |
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protectedinherited |
send data
to all matched and qualified faces
A matched face is qualified if it is ad-hoc or it is NOT inFace
- Parameters
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pitEntry | PIT entry |
inFace | face through which the Data comes from |
data | the Data packet |
Definition at line 209 of file strategy.cpp.
void nfd::fw::Strategy::sendInterest |
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const shared_ptr< pit::Entry > & |
pitEntry, |
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Face & |
outFace, |
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const Interest & |
interest |
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) |
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inlineprotectedinherited |
send Interest to outFace
- Parameters
-
pitEntry | PIT entry |
outFace | face through which to send out the Interest |
interest | the Interest packet |
Definition at line 241 of file strategy.hpp.
void nfd::fw::Strategy::sendNack |
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const shared_ptr< pit::Entry > & |
pitEntry, |
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const Face & |
outFace, |
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const lp::NackHeader & |
header |
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) |
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inlineprotectedinherited |
send Nack to outFace
- Parameters
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pitEntry | PIT entry |
outFace | face through which to send out the Nack |
header | Nack header |
The outFace must have a PIT in-record, otherwise this method has no effect.
Definition at line 286 of file strategy.hpp.
void nfd::fw::Strategy::sendNacks |
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const shared_ptr< pit::Entry > & |
pitEntry, |
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const lp::NackHeader & |
header, |
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std::initializer_list< const Face * > |
exceptFaces = std::initializer_list<const Face*>() |
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) |
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protectedinherited |
send Nack to every face that has an in-record, except those in exceptFaces
- Parameters
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pitEntry | PIT entry |
header | NACK header |
exceptFaces | list of faces that should be excluded from sending Nacks |
- Note
- This is not an action, but a helper that invokes the sendNack action.
Definition at line 231 of file strategy.cpp.
void nfd::fw::Strategy::setExpiryTimer |
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const shared_ptr< pit::Entry > & |
pitEntry, |
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time::milliseconds |
duration |
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) |
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inlineprotectedinherited |
Schedule the PIT entry to be erased after duration
.
Definition at line 306 of file strategy.hpp.
void nfd::fw::Strategy::setInstanceName |
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const Name & |
name | ) |
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inlineprotectedinherited |
set strategy instance name
- Note
- This must be called by strategy subclass constructor.
Definition at line 367 of file strategy.hpp.
signal::Signal<FaceTable, Face&>& nfd::fw::Strategy::afterAddFace |
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protectedinherited |
signal::Signal<FaceTable, Face&>& nfd::fw::Strategy::beforeRemoveFace |
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protectedinherited |