inet::PreemptableStreamer Class Reference

#include <PreemptableStreamer.h>

Inheritance diagram for inet::PreemptableStreamer:

Public Member Functions
virtual	~PreemptableStreamer ()
virtual IPassivePacketSink *	getConsumer (cGate *gate) override
	Returns the passive packet sink where packets are pushed or nullptr if the connected module doesn't implement the interface. More...
virtual IPassivePacketSource *	getProvider (cGate *gate) override
	Returns the passive packet source from where packets are pulled or nullptr if the connected module doesn't implement the interface. More...
virtual bool	supportsPacketPushing (cGate *gate) const override
	Returns true if the processor supports pushing packets at the given gate. More...
virtual bool	supportsPacketPulling (cGate *gate) const override
	Returns true if the processor supports pulling packets at the given gate. More...
virtual bool	supportsPacketPassing (cGate *gate) const override
	Returns true if the processor supports passing packets as a whole at the given gate. More...
virtual bool	supportsPacketStreaming (cGate *gate) const override
	Returns true if the processor supports streaming packets at the given gate. More...
virtual bool	canPushSomePacket (cGate *gate) const override
	Returns false if the packet sink is full at the given gate and no more packets can be pushed into it without raising an error. More...
virtual bool	canPushPacket (Packet *packet, cGate *gate) const override
	Returns true if the given packet can be pushed at the given gate into the packet sink without raising an error. More...
virtual void	pushPacket (Packet *packet, cGate *gate) override
	Pushes the packet into the packet sink at the given gate. More...
virtual void	pushPacketStart (Packet *packet, cGate *gate, bps datarate) override
	Starts pushing the packet into the packet sink at the given gate. More...
virtual void	pushPacketEnd (Packet *packet, cGate *gate) override
	Ends pushing the packet into the packet sink at the given gate. More...
virtual void	pushPacketProgress (Packet *packet, cGate *gate, bps datarate, b position, b extraProcessableLength=b(0)) override
	Progresses pushing the packet into the packet sink at the given gate. More...
virtual void	handleCanPushPacketChanged (cGate *gate) override
	Notifies about a change in the possibility of pushing some packet into the passive packet sink at the given gate. More...
virtual void	handlePushPacketProcessed (Packet *packet, cGate *gate, bool successful) override
	Notifies about the completion of the packet processing for a packet that was pushed earlier independently whether the packet is passed or streamed. More...
virtual bool	canPullSomePacket (cGate *gate) const override
	Returns false if the packet source is empty at the given gate and no more packets can be pulled from it without raising an error. More...
virtual Packet *	canPullPacket (cGate *gate) const override
	Returns the packet that can be pulled at the given gate. More...
virtual Packet *	pullPacket (cGate *gate) override
	Pulls the packet from the packet source at the given gate. More...
virtual Packet *	pullPacketStart (cGate *gate, bps datarate) override
	Starts pulling the packet from the packet source at the given gate. More...
virtual Packet *	pullPacketEnd (cGate *gate) override
	Ends pulling the packet from the packet source at the given gate. More...
virtual Packet *	pullPacketProgress (cGate *gate, bps datarate, b position, b extraProcessableLength) override
	Progresses pulling the packet from the packet source at the given gate. More...
virtual void	handleCanPullPacketChanged (cGate *gate) override
	Notifies about a change in the possibility of pulling some packet from the passive packet source at the given gate. More...
virtual void	handlePullPacketProcessed (Packet *packet, cGate *gate, bool successful) override
	Notifies about the completion of the packet processing for a packet that was pulled earlier independently whether the packet is passed or streamed. More...
Public Member Functions inherited from inet::ClockUserModuleMixin< PacketProcessorBase >
virtual void	scheduleClockEventAt (clocktime_t time, ClockEvent *msg)
virtual void	scheduleClockEventAfter (clocktime_t delay, ClockEvent *msg)
virtual cMessage *	cancelClockEvent (ClockEvent *msg)
virtual void	cancelAndDeleteClockEvent (ClockEvent *msg)
virtual void	rescheduleClockEventAt (clocktime_t time, ClockEvent *msg)
virtual void	rescheduleClockEventAfter (clocktime_t time, ClockEvent *msg)
virtual clocktime_t	computeClockTimeFromSimTime (simtime_t time) const
virtual simtime_t	computeSimTimeFromClockTime (clocktime_t time) const
virtual clocktime_t	getClockTime () const
virtual clocktime_t	getArrivalClockTime (ClockEvent *msg) const
Public Member Functions inherited from inet::queueing::PacketProcessorBase
virtual bool	supportsPacketSending (cGate *gate) const override
	Returns true if the processor supports sending packets at the given gate. More...
virtual const char *	resolveDirective (char directive) const override
Public Member Functions inherited from inet::queueing::IPacketProcessor
virtual	~IPacketProcessor ()
Public Member Functions inherited from inet::queueing::IPassivePacketSink
virtual	~IPassivePacketSink ()
Public Member Functions inherited from inet::queueing::IActivePacketSink
virtual	~IActivePacketSink ()
Public Member Functions inherited from inet::queueing::IPassivePacketSource
virtual	~IPassivePacketSource ()
Public Member Functions inherited from inet::queueing::IActivePacketSource
virtual	~IActivePacketSource ()

Protected Member Functions
virtual void	initialize (int stage) override
virtual void	handleMessage (cMessage *message) override
virtual bool	isStreaming () const
virtual void	endStreaming ()
Protected Member Functions inherited from inet::queueing::PacketProcessorBase
virtual int	numInitStages () const override
virtual void	refreshDisplay () const override
virtual void	handlePacketProcessed (Packet *packet)
virtual void	checkPacketOperationSupport (cGate *gate) const
virtual void	checkPacketOperationSupport (cGate *startGate, cGate *endGate) const
virtual void	animate (Packet *packet, cGate *gate, const SendOptions &sendOptions, Action action) const
virtual void	animatePacket (Packet *packet, cGate *gate, Action action) const
virtual void	animatePacketStart (Packet *packet, cGate *gate, bps datarate, long transmissionId, Action action) const
virtual void	animatePacketStart (Packet *packet, cGate *gate, bps datarate, const SendOptions &sendOptions, Action action) const
virtual void	animatePacketEnd (Packet *packet, cGate *gate, long transmissionId, Action action) const
virtual void	animatePacketEnd (Packet *packet, cGate *gate, const SendOptions &sendOptions, Action action) const
virtual void	animatePacketProgress (Packet *packet, cGate *gate, bps datarate, b position, b extraProcessableLength, long transmissionId, Action action) const
virtual void	animatePacketProgress (Packet *packet, cGate *gate, bps datarate, b position, b extraProcessableLength, const SendOptions &sendOptions, Action action) const
virtual void	pushOrSendPacket (Packet *packet, cGate *gate, IPassivePacketSink *consumer)
virtual void	pushOrSendPacketStart (Packet *packet, cGate *gate, IPassivePacketSink *consumer, bps datarate, int transmissionId)
virtual void	pushOrSendPacketEnd (Packet *packet, cGate *gate, IPassivePacketSink *consumer, int transmissionId)
virtual void	pushOrSendPacketProgress (Packet *packet, cGate *gate, IPassivePacketSink *consumer, bps datarate, b position, b extraProcessableLength, int transmissionId)
virtual void	animatePush (Packet *packet, cGate *gate, const SendOptions &sendOptions) const
virtual void	animatePushPacket (Packet *packet, cGate *gate) const
virtual void	animatePushPacketStart (Packet *packet, cGate *gate, bps datarate, long transmissionId) const
virtual void	animatePushPacketStart (Packet *packet, cGate *gate, bps datarate, const SendOptions &sendOptions) const
virtual void	animatePushPacketEnd (Packet *packet, cGate *gate, long transmissionId) const
virtual void	animatePushPacketEnd (Packet *packet, cGate *gate, const SendOptions &sendOptions) const
virtual void	animatePushPacketProgress (Packet *packet, cGate *gate, bps datarate, b position, b extraProcessableLength, long transmissionId) const
virtual void	animatePushPacketProgress (Packet *packet, cGate *gate, bps datarate, b position, b extraProcessableLength, const SendOptions &sendOptions) const
virtual void	animatePull (Packet *packet, cGate *gate, const SendOptions &sendOptions) const
virtual void	animatePullPacket (Packet *packet, cGate *gate) const
virtual void	animatePullPacketStart (Packet *packet, cGate *gate, bps datarate, long transmissionId) const
virtual void	animatePullPacketStart (Packet *packet, cGate *gate, bps datarate, const SendOptions &sendOptions) const
virtual void	animatePullPacketEnd (Packet *packet, cGate *gate, long transmissionId) const
virtual void	animatePullPacketEnd (Packet *packet, cGate *gate, const SendOptions &sendOptions) const
virtual void	animatePullPacketProgress (Packet *packet, cGate *gate, bps datarate, b position, b extraProcessableLength, long transmissionId) const
virtual void	animatePullPacketProgress (Packet *packet, cGate *gate, bps datarate, b position, b extraProcessableLength, const SendOptions &sendOptions) const
virtual void	dropPacket (Packet *packet, PacketDropReason reason, int limit=-1)
virtual void	updateDisplayString () const

Protected Attributes
bps	datarate = bps(NaN)
b	minPacketLength = b(-1)
b	roundingLength = b(-1)
cGate *	inputGate = nullptr
IActivePacketSource *	producer = nullptr
IPassivePacketSource *	provider = nullptr
cGate *	outputGate = nullptr
IPassivePacketSink *	consumer = nullptr
IActivePacketSink *	collector = nullptr
simtime_t	streamStart
bps	streamDatarate = bps(NaN)
Packet *	streamedPacket = nullptr
Packet *	remainingPacket = nullptr
ClockEvent *	endStreamingTimer = nullptr
Protected Attributes inherited from inet::queueing::PacketProcessorBase
const char *	displayStringTextFormat = nullptr
int	numProcessedPackets = -1
b	processedTotalLength = b(-1)

Additional Inherited Members
Protected Types inherited from inet::queueing::PacketProcessorBase
enum	Action { PUSH, PULL }

Constructor & Destructor Documentation

~PreemptableStreamer()

inet::PreemptableStreamer::~PreemptableStreamer ( )

virtual

{
    delete streamedPacket;
    delete remainingPacket;
    cancelAndDeleteClockEvent(endStreamingTimer);
}

Member Function Documentation

canPullPacket()

Packet * inet::PreemptableStreamer::canPullPacket ( cGate *  gate ) const

overridevirtual

Returns the packet that can be pulled at the given gate.

The returned value is nullptr if there is no such packet.

The gate must be a valid gate of this module and it must support pushing packets.

Implements inet::queueing::IPassivePacketSource.

{
    return isStreaming() ? nullptr : remainingPacket != nullptr ? remainingPacket : provider->canPullPacket(inputGate->getPathStartGate());
}

canPullSomePacket()

bool inet::PreemptableStreamer::canPullSomePacket ( cGate *  gate ) const

overridevirtual

Returns false if the packet source is empty at the given gate and no more packets can be pulled from it without raising an error.

The gate must be a valid gate of this module and it must support pulling packets.

Implements inet::queueing::IPassivePacketSource.

{
    return !isStreaming() && (remainingPacket != nullptr || provider->canPullSomePacket(inputGate->getPathStartGate()));
}

canPushPacket()

bool inet::PreemptableStreamer::canPushPacket ( Packet *  packet, cGate *  gate  ) const

overridevirtual

Returns true if the given packet can be pushed at the given gate into the packet sink without raising an error.

The packet must not be nullptr. The gate must be a valid gate of this module and it must support pushing packets.

Implements inet::queueing::IPassivePacketSink.

{
    return !isStreaming() && consumer->canPushPacket(packet, outputGate->getPathEndGate());
}

canPushSomePacket()

bool inet::PreemptableStreamer::canPushSomePacket ( cGate *  gate ) const

overridevirtual

Returns false if the packet sink is full at the given gate and no more packets can be pushed into it without raising an error.

The gate must be a valid gate of this module and it must support pushing packets.

Implements inet::queueing::IPassivePacketSink.

{
    return !isStreaming() && consumer->canPushSomePacket(outputGate->getPathEndGate());
}

endStreaming()

void inet::PreemptableStreamer::endStreaming ( )

protectedvirtual

{
    auto packetLength = streamedPacket->getTotalLength();
    EV_INFO << "Ending streaming packet" << EV_FIELD(packet, *streamedPacket) << EV_ENDL;
    pushOrSendPacketEnd(streamedPacket, outputGate, consumer, streamedPacket->getId());
    streamDatarate = bps(NaN);
    streamedPacket = nullptr;
    numProcessedPackets++;
    processedTotalLength += packetLength;
    updateDisplayString();
}

Referenced by handleMessage(), and pushPacket().

getConsumer()

virtual IPassivePacketSink* inet::PreemptableStreamer::getConsumer ( cGate *  gate )

inlineoverridevirtual

Returns the passive packet sink where packets are pushed or nullptr if the connected module doesn't implement the interface.

The gate parameter must be a valid gate of this module.

Implements inet::queueing::IActivePacketSource.

{ return this; }

getProvider()

virtual IPassivePacketSource* inet::PreemptableStreamer::getProvider ( cGate *  gate )

inlineoverridevirtual

Returns the passive packet source from where packets are pulled or nullptr if the connected module doesn't implement the interface.

The gate parameter must be a valid gate of this module.

Implements inet::queueing::IActivePacketSink.

{ return this; }

handleCanPullPacketChanged()

void inet::PreemptableStreamer::handleCanPullPacketChanged ( cGate *  gate )

overridevirtual

Notifies about a change in the possibility of pulling some packet from the passive packet source at the given gate.

This method is called, for example, when a new packet is inserted into a queue. It allows the sink to pull a new packet from the queue.

The gate parameter must be a valid gate of this module.

Implements inet::queueing::IActivePacketSink.

{
    Enter_Method("handleCanPullPacketChanged");
    if (collector != nullptr && !isStreaming())
        collector->handleCanPullPacketChanged(outputGate->getPathEndGate());
}

handleCanPushPacketChanged()

void inet::PreemptableStreamer::handleCanPushPacketChanged ( cGate *  gate )

overridevirtual

Notifies about a change in the possibility of pushing some packet into the passive packet sink at the given gate.

This method is called, for example, when a new packet can be inserted into a queue. It allows the source to push a new packet into the queue.

The gate parameter must be a valid gate of this module.

Implements inet::queueing::IActivePacketSource.

{
    Enter_Method("handleCanPushPacketChanged");
    if (producer != nullptr)
        producer->handleCanPushPacketChanged(inputGate->getPathStartGate());
}

handleMessage()

void inet::PreemptableStreamer::handleMessage ( cMessage *  message )

overrideprotectedvirtual

{
    if (message == endStreamingTimer)
        endStreaming();
    else {
        auto packet = check_and_cast<Packet *>(message);
        pushPacket(packet, packet->getArrivalGate());
    }
}

handlePullPacketProcessed()

void inet::PreemptableStreamer::handlePullPacketProcessed ( Packet *  packet, cGate *  gate, bool  successful  )

overridevirtual

Notifies about the completion of the packet processing for a packet that was pulled earlier independently whether the packet is passed or streamed.

This method is called, for example, when a previously pulled packet is failed to be processed successfully. It allows the sink to retry the operation.

The gate parameter must be a valid gate of this module. The packet must not be nullptr.

Implements inet::queueing::IActivePacketSink.

{
    Enter_Method("handlePullPacketConfirmation");
    if (collector != nullptr)
        collector->handlePullPacketProcessed(packet, gate, successful);
}

handlePushPacketProcessed()

void inet::PreemptableStreamer::handlePushPacketProcessed ( Packet *  packet, cGate *  gate, bool  successful  )

overridevirtual

Notifies about the completion of the packet processing for a packet that was pushed earlier independently whether the packet is passed or streamed.

This method is called, for example, when a previously pushed packet is failed to be processed successfully. It allows the source to retry the operation.

The gate parameter must be a valid gate of this module. The packet must not be nullptr.

Implements inet::queueing::IActivePacketSource.

{
    Enter_Method("handlePushPacketProcessed");
    if (producer != nullptr)
        producer->handlePushPacketProcessed(packet, inputGate->getPathStartGate(), successful);
}

initialize()

void inet::PreemptableStreamer::initialize ( int  stage )

overrideprotectedvirtual

Reimplemented from inet::queueing::PacketProcessorBase.

{
    ClockUserModuleMixin::initialize(stage);
    if (stage == INITSTAGE_LOCAL) {
        datarate = bps(par("datarate"));
        minPacketLength = b(par("minPacketLength"));
        roundingLength = b(par("roundingLength"));
        inputGate = gate("in");
        outputGate = gate("out");
        producer = findConnectedModule<IActivePacketSource>(inputGate);
        provider = findConnectedModule<IPassivePacketSource>(inputGate);
        consumer = findConnectedModule<IPassivePacketSink>(outputGate);
        collector = findConnectedModule<IActivePacketSink>(outputGate);
        endStreamingTimer = new ClockEvent("EndStreamingTimer");
    }
    else if (stage == INITSTAGE_QUEUEING) {
        checkPacketOperationSupport(inputGate);
        checkPacketOperationSupport(outputGate);
    }
}

isStreaming()

virtual bool inet::PreemptableStreamer::isStreaming ( ) const

inlineprotectedvirtual

{ return streamedPacket != nullptr; }

Referenced by canPullPacket(), canPullSomePacket(), canPushPacket(), canPushSomePacket(), handleCanPullPacketChanged(), and pushPacket().

pullPacket()

virtual Packet* inet::PreemptableStreamer::pullPacket ( cGate *  gate )

inlineoverridevirtual

Pulls the packet from the packet source at the given gate.

This operation pulls the packet as a whole. The onwership of the packet is transferred to the sink.

The source must not be empty at the given gate. The returned packet must not be nullptr. The gate must be a valid gate of this module and it must support pulling and passing packets.

Implements inet::queueing::IPassivePacketSource.

{ throw cRuntimeError("Invalid operation"); }

pullPacketEnd()

Packet * inet::PreemptableStreamer::pullPacketEnd ( cGate *  gate )

overridevirtual

Ends pulling the packet from the packet source at the given gate.

This is a packet streaming operation. The onwership of the packet is transferred to the sink.

Packet streaming can be started with any of the streaming operations, and ends when the streaming position plus the extra processable packet length equals to the total packet length.

This method is called, for example, when a preemption supporting server module ends streaming a packet from the the source.

The source must not be empty at the gate and no other packet streaming can be in progress. The gate must be a valid gate of this module and it must support pulling and streaming packets. The returned packet must not be nullptr.

Implements inet::queueing::IPassivePacketSource.

{
    Enter_Method("pullPacketEnd");
    EV_INFO << "Ending streaming packet" << EV_FIELD(packet, *streamedPacket) << EV_ENDL;
    auto packet = streamedPacket;
    b pulledLength = streamDatarate * s((simTime() - streamStart).dbl());
    b preemptedLength = roundingLength * ((pulledLength + roundingLength - b(1)) / roundingLength);
    if (preemptedLength < minPacketLength)
        preemptedLength = minPacketLength;
    if (preemptedLength + minPacketLength <= packet->getTotalLength()) {
        // already pulled part
        const auto& fragmentTag = packet->getTagForUpdate<FragmentTag>();
        fragmentTag->setLastFragment(false);
        auto fragmentNumber = fragmentTag->getFragmentNumber();
        std::string basePacketName = packet->getName();
        if (fragmentNumber != 0)
            basePacketName = basePacketName.substr(0, basePacketName.find("-frag"));
        std::string packetName = basePacketName + "-frag" + std::to_string(fragmentNumber);
        packet->setName(packetName.c_str());
        packet->removeTagIfPresent<PacketProtocolTag>();
        // remaining part
        std::string remainingPacketName = basePacketName + "-frag" + std::to_string(fragmentNumber + 1);
        const auto& remainingData = packet->removeAtBack(packet->getTotalLength() - preemptedLength);
        remainingPacket = new Packet(remainingPacketName.c_str(), remainingData);
        remainingPacket->copyTags(*packet);
        const auto& remainingPacketFragmentTag = remainingPacket->getTagForUpdate<FragmentTag>();
        remainingPacketFragmentTag->setFirstFragment(false);
        remainingPacketFragmentTag->setLastFragment(true);
        remainingPacketFragmentTag->setFragmentNumber(fragmentNumber + 1);
    }
    handlePacketProcessed(packet);
    animatePullPacketEnd(packet, outputGate, streamedPacket->getId());
    streamedPacket = nullptr;
    updateDisplayString();
    return packet;
}

pullPacketProgress()

Packet * inet::PreemptableStreamer::pullPacketProgress ( cGate *  gate, bps  datarate, b  position, b  extraProcessableLength  )

overridevirtual

Progresses pulling the packet from the packet source at the given gate.

This is a packet streaming operation. The position specifies where the packet streaming is at the moment. The extra length parameter partially fixes the future of the packet streaming operation. The onwership of the packet is transferred to the sink.

Packet streaming can be started with any of the streaming operations, and ends when the streaming position plus the extra processable packet length equals to the total packet length.

This method is called, for example, to notify the source about a change in the packet data when a preemption occurs.

The source must not be empty at the gate and no other packet streaming can be in progress. The gate must be a valid gate of this module and it must support pulling and streaming packets. The returned packet must not be nullptr.

Implements inet::queueing::IPassivePacketSource.

{
    Enter_Method("pullPacketProgress");
    streamDatarate = datarate;
    EV_INFO << "Progressing streaming" << EV_FIELD(packet, *streamedPacket) << EV_ENDL;
    auto packet = streamedPacket->dup();
    animatePullPacketProgress(packet, outputGate, streamDatarate, position, extraProcessableLength, streamedPacket->getId());
    updateDisplayString();
    return packet;
}

pullPacketStart()

Packet * inet::PreemptableStreamer::pullPacketStart ( cGate *  gate, bps  datarate  )

overridevirtual

Starts pulling the packet from the packet source at the given gate.

This is a packet streaming operation. The onwership of the packet is transferred to the sink.

Packet streaming can be started with any of the streaming operations, and ends when the streaming position plus the extra processable packet length equals to the total packet length.

This method is called, for example, when a preemption supporting server module starts streaming a packet from the source.

The source must not be empty at the gate and no other packet streaming can be in progress. The gate must be a valid gate of this module and it must support pulling and streaming packets. The returned packet must not be nullptr.

Implements inet::queueing::IPassivePacketSource.

{
    Enter_Method("pullPacketStart");
    streamDatarate = datarate;
    if (remainingPacket == nullptr) {
        streamedPacket = provider->pullPacket(inputGate->getPathStartGate());
        take(streamedPacket);
    }
    else {
        streamedPacket = remainingPacket;
        remainingPacket = nullptr;
    }
    auto fragmentTag = streamedPacket->findTagForUpdate<FragmentTag>();
    if (fragmentTag == nullptr) {
        fragmentTag = streamedPacket->addTag<FragmentTag>();
        fragmentTag->setFirstFragment(true);
        fragmentTag->setLastFragment(true);
        fragmentTag->setFragmentNumber(0);
        fragmentTag->setNumFragments(-1);
    }
    streamStart = simTime();
    auto packet = streamedPacket->dup();
    EV_INFO << "Starting streaming packet" << EV_FIELD(packet) << EV_ENDL;
    animatePullPacketStart(packet, outputGate, streamDatarate, streamedPacket->getId());
    updateDisplayString();
    return packet;
}

pushPacket()

void inet::PreemptableStreamer::pushPacket ( Packet *  packet, cGate *  gate  )

overridevirtual

Pushes the packet into the packet sink at the given gate.

This operation pushes the packet as a whole. The onwership of the packet is transferred to the sink.

This method is called, for example, when a packet source module pushes a packet into a queue module.

The sink must not be full at the gate. The packet must not be nullptr. The gate must be a valid gate of this module and it must support pushing and passing packets.

Implements inet::queueing::IPassivePacketSink.

{
    Enter_Method("pushPacket");
    ASSERT(!isStreaming());
    take(packet);
    streamDatarate = datarate;
    streamedPacket = packet;
    EV_INFO << "Starting streaming packet" << EV_FIELD(packet) << EV_ENDL;
    pushOrSendPacketStart(streamedPacket->dup(), outputGate, consumer, datarate, streamedPacket->getId());
    if (std::isnan(streamDatarate.get()))
        endStreaming();
    else
        scheduleClockEventAfter(s(streamedPacket->getTotalLength() / streamDatarate).get(), endStreamingTimer);
}

Referenced by handleMessage().

pushPacketEnd()

virtual void inet::PreemptableStreamer::pushPacketEnd ( Packet *  packet, cGate *  gate  )

inlineoverridevirtual

Ends pushing the packet into the packet sink at the given gate.

This is a packet streaming operation. The onwership of the packet is transferred to the sink.

Packet streaming can be started with any of the streaming operations, and ends when the streaming position plus the extra processable packet length equals to the total packet length.

This method is called, for example, when a preemption supporting server module ends streaming a packet to the sink.

The sink must not be full at the gate and no other packet streaming can be in progress. The packet must not be nullptr. The gate must be a valid gate of this module and it must support pushing and streaming packets.

Implements inet::queueing::IPassivePacketSink.

{ throw cRuntimeError("Invalid operation"); }

pushPacketProgress()

virtual void inet::PreemptableStreamer::pushPacketProgress ( Packet *  packet, cGate *  gate, bps  datarate, b  position, b  extraProcessableLength = b(0)  )

inlineoverridevirtual

Progresses pushing the packet into the packet sink at the given gate.

This is a packet streaming operation. The position specifies where the packet streaming is at the moment. The extra length parameter partially fixes the future of the packet streaming operation. The onwership of the packet is transferred to the sink.

Packet streaming can be started with any of the streaming operations, and ends when the streaming position plus the extra processable packet length equals to the total packet length.

This method is called, for example, to notify the sink about a change in the packet data when a preemption occurs.

The sink must not be full at the gate and no other packet streaming can be in progress. The packet must not be nullptr. The gate must be a valid gate of this module and it must support pushing and streaming packets.

Implements inet::queueing::IPassivePacketSink.

{ throw cRuntimeError("Invalid operation"); }

pushPacketStart()

virtual void inet::PreemptableStreamer::pushPacketStart ( Packet *  packet, cGate *  gate, bps  datarate  )

inlineoverridevirtual

Starts pushing the packet into the packet sink at the given gate.

This is a packet streaming operation. The onwership of the packet is transferred to the sink.

Packet streaming can be started with any of the streaming operations, and ends when the streaming position plus the extra processable packet length equals to the total packet length.

This method is called, for example, when a preemption supporting server module starts streaming a packet to the sink.

The sink must not be full at the gate and no other packet streaming can be in progress. The packet must not be nullptr. The gate must be a valid gate of this module and it must support pushing and streaming packets.

Implements inet::queueing::IPassivePacketSink.

{ throw cRuntimeError("Invalid operation"); }

supportsPacketPassing()

virtual bool inet::PreemptableStreamer::supportsPacketPassing ( cGate *  gate ) const

inlineoverridevirtual

Returns true if the processor supports passing packets as a whole at the given gate.

A passed packet is handed over from one module to another by either the standard OMNeT++ handleMessage() mechanism, or by directly calling pushPacket() or pullPacket().

For example, packets are passed as a whole to and from a queue module.

Connecting incompatible gates raises an error during initialize. The gate parameter must be a valid gate of this module. The gate should be marked with @labels(pass) in the NED file.

Reimplemented from inet::queueing::PacketProcessorBase.

{ return gate == inputGate; }

supportsPacketPulling()

virtual bool inet::PreemptableStreamer::supportsPacketPulling ( cGate *  gate ) const

inlineoverridevirtual

Returns true if the processor supports pulling packets at the given gate.

Pulling a packet is a synchronous operation that is initiated by the sink module. A pulled packet can be passed as a whole using pullPacket(), or it can be streamed from the source to the sink using pullPacketStart(), pullPacketEnd(), and pullPacketProgress().

For output gates, true means that the connected module can pull packets from this module. For input gates, true means that this module can pull packets from the connected module. For example, a packet server module can pull packets from a queue module.

Connecting incompatible gates raises an error during initialize. The gate parameter must be a valid gate of this module. The gate should be marked with @labels(pull) in the NED file.

Implements inet::queueing::IPacketProcessor.

{ return true; }

supportsPacketPushing()

virtual bool inet::PreemptableStreamer::supportsPacketPushing ( cGate *  gate ) const

inlineoverridevirtual

Returns true if the processor supports pushing packets at the given gate.

Pushing a packet is a synchronous operation that is initiated by the source module. A pushed packet can be passed as a whole using pushPacket(), or it can be streamed from the source to the sink using pushPacketStart(), pushPacketEnd(), and pushPacketProgress().

For output gates, true means that this module can push packets into the connected module. For input gates, true means that the connected module can push packets into this module. For example, a packet generator module can push packets into a queue module.

Connecting incompatible gates raises an error during initialize. The gate parameter must be a valid gate of this module. The gate should be marked with @labels(push) in the NED file.

Implements inet::queueing::IPacketProcessor.

{ return true; }

supportsPacketStreaming()

virtual bool inet::PreemptableStreamer::supportsPacketStreaming ( cGate *  gate ) const

inlineoverridevirtual

Returns true if the processor supports streaming packets at the given gate.

A streamed packet is handed over from one module to another using several method calls and potentially exending to a non-zero simulation duration.

For example, packets are streamed to a preemptable signal transmitter module.

Connecting incompatible gates raises an error during initialize. The gate parameter must be a valid gate of this module. The gate should be marked with @labels(stream) in the NED file.

Reimplemented from inet::queueing::PacketProcessorBase.

{ return gate == outputGate; }

Member Data Documentation

collector

IActivePacketSink* inet::PreemptableStreamer::collector = nullptr

protected

Referenced by handleCanPullPacketChanged(), handlePullPacketProcessed(), and initialize().

consumer

IPassivePacketSink* inet::PreemptableStreamer::consumer = nullptr

protected

Referenced by canPushPacket(), canPushSomePacket(), endStreaming(), initialize(), and pushPacket().

datarate

bps inet::PreemptableStreamer::datarate = bps(NaN)

protected

Referenced by initialize(), pullPacketProgress(), pullPacketStart(), and pushPacket().

endStreamingTimer

ClockEvent* inet::PreemptableStreamer::endStreamingTimer = nullptr

protected

Referenced by handleMessage(), initialize(), pushPacket(), and ~PreemptableStreamer().

inputGate

cGate* inet::PreemptableStreamer::inputGate = nullptr

protected

Referenced by canPullPacket(), canPullSomePacket(), handleCanPushPacketChanged(), handlePushPacketProcessed(), initialize(), and pullPacketStart().

minPacketLength

b inet::PreemptableStreamer::minPacketLength = b(-1)

protected

Referenced by initialize(), and pullPacketEnd().

outputGate

cGate* inet::PreemptableStreamer::outputGate = nullptr

protected

Referenced by canPushPacket(), canPushSomePacket(), endStreaming(), handleCanPullPacketChanged(), initialize(), pullPacketEnd(), pullPacketProgress(), pullPacketStart(), and pushPacket().

producer

IActivePacketSource* inet::PreemptableStreamer::producer = nullptr

protected

Referenced by handleCanPushPacketChanged(), handlePushPacketProcessed(), and initialize().

provider

IPassivePacketSource* inet::PreemptableStreamer::provider = nullptr

protected

Referenced by canPullPacket(), canPullSomePacket(), initialize(), and pullPacketStart().

remainingPacket

Packet* inet::PreemptableStreamer::remainingPacket = nullptr

protected

Referenced by canPullPacket(), canPullSomePacket(), pullPacketEnd(), pullPacketStart(), and ~PreemptableStreamer().

roundingLength

b inet::PreemptableStreamer::roundingLength = b(-1)

protected

Referenced by initialize(), and pullPacketEnd().

streamDatarate

bps inet::PreemptableStreamer::streamDatarate = bps(NaN)

protected

Referenced by endStreaming(), pullPacketEnd(), pullPacketProgress(), pullPacketStart(), and pushPacket().

streamedPacket

Packet* inet::PreemptableStreamer::streamedPacket = nullptr

protected

Referenced by endStreaming(), pullPacketEnd(), pullPacketProgress(), pullPacketStart(), pushPacket(), and ~PreemptableStreamer().

streamStart

simtime_t inet::PreemptableStreamer::streamStart

protected

Referenced by pullPacketEnd(), and pullPacketStart().

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

• PreemptableStreamer.h
• PreemptableStreamer.cc