#include "three-gpp-http-server.h"

Inheritance diagram for ns3::ThreeGppHttpServerTxBuffer:

Collaboration diagram for ns3::ThreeGppHttpServerTxBuffer:

Classes
struct	TxBuffer_t
	Set of fields representing a single transmission buffer, which will be associated with a socket. More...

Public Member Functions
	ThreeGppHttpServerTxBuffer ()
	Create an empty instance of transmission buffer.

void	AddSocket (Ptr< Socket > socket)
	Add a new socket and create an empty transmission buffer for it.

void	CloseAllSockets ()
	Close and remove all stored sockets, hence clearing the buffer.

void	CloseSocket (Ptr< Socket > socket)
	Close and remove a socket and its associated transmission buffer, and then unset the socket's callback to prevent further interaction with the socket.

void	DepleteBufferSize (Ptr< Socket > socket, uint32_t amount)
	Decrements a buffer size by a given amount.

ThreeGppHttpHeader::ContentType_t	GetBufferContentType (Ptr< Socket > socket) const
	Returns ThreeGppHttpHeader::NOT_SET when the buffer is new and never been filled with any data before.

uint32_t	GetBufferSize (Ptr< Socket > socket) const

Time	GetClientTs (Ptr< Socket > socket) const

bool	HasTxedPartOfObject (Ptr< Socket > socket) const

bool	IsBufferEmpty (Ptr< Socket > socket) const

bool	IsSocketAvailable (Ptr< Socket > socket) const
	This method is typically used before calling other methods.

void	PrepareClose (Ptr< Socket > socket)
	Tell the buffer to close the associated socket once the buffer becomes empty.

void	RecordNextServe (Ptr< Socket > socket, const EventId &eventId, const Time &clientTs)
	Informs about a pending transmission event associated with the socket, so that it would be automatically canceled in case the socket is closed.

void	RemoveSocket (Ptr< Socket > socket)
	Remove a socket and its associated transmission buffer, and then unset the socket's callbacks to prevent further interaction with the socket.

void	WriteNewObject (Ptr< Socket > socket, ThreeGppHttpHeader::ContentType_t contentType, uint32_t objectSize)
	Writes a data representing a new main object or embedded object to the transmission buffer.

Public Member Functions inherited from ns3::SimpleRefCount< ThreeGppHttpServerTxBuffer >
	SimpleRefCount ()
	Default constructor.

	SimpleRefCount (const SimpleRefCount &o)
	Copy constructor.

uint32_t	GetReferenceCount () const
	Get the reference count of the object.

SimpleRefCount &	operator= (const SimpleRefCount &o)
	Assignment operator.

void	Ref () const
	Increment the reference count.

void	Unref () const
	Decrement the reference count.

Private Attributes
std::map< Ptr< Socket >, TxBuffer_t >	m_txBuffer
	Collection of accepted sockets and its individual transmission buffer.

Detailed Description

Internal:

Transmission buffer used by an HTTP server instance.

The class handles the sockets which face the connected HTTP clients. An individual buffer is allocated for each socket. The buffer indicates the length (in bytes) and the type of the data within, i.e., it does not contain the actual packet data.

Types of data are expressed using the ThreeGppHttpHeader::ContentType_t type. Only one type of data can be active for one client at a time, i.e., the current content of a buffer has to be removed before a different type of data can be added.

Definition at line 301 of file three-gpp-http-server.h.

Constructor & Destructor Documentation

◆ ThreeGppHttpServerTxBuffer()

ns3::ThreeGppHttpServerTxBuffer::ThreeGppHttpServerTxBuffer ( )

Create an empty instance of transmission buffer.

Definition at line 632 of file three-gpp-http-server.cc.

References NS_LOG_FUNCTION.

Member Function Documentation

◆ AddSocket()

void ns3::ThreeGppHttpServerTxBuffer::AddSocket ( Ptr< Socket > socket )

Add a new socket and create an empty transmission buffer for it.

After the method is completed, IsSocketAvailable() for the same pointer of socket shall return true.

Parameters

socket Pointer to the new socket to be added (must not exist in the buffer).

Warning: Must be called only when IsSocketAvailable() for the given socket is false.

Definition at line 645 of file three-gpp-http-server.cc.

References ns3::ThreeGppHttpServerTxBuffer::TxBuffer_t::hasTxedPartOfObject, ns3::ThreeGppHttpServerTxBuffer::TxBuffer_t::isClosing, IsSocketAvailable(), m_txBuffer, ns3::ThreeGppHttpHeader::NOT_SET, NS_ASSERT_MSG, NS_LOG_FUNCTION, ns3::ThreeGppHttpServerTxBuffer::TxBuffer_t::txBufferContentType, and ns3::ThreeGppHttpServerTxBuffer::TxBuffer_t::txBufferSize.

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◆ CloseAllSockets()

void ns3::ThreeGppHttpServerTxBuffer::CloseAllSockets ( )

Close and remove all stored sockets, hence clearing the buffer.

Definition at line 716 of file three-gpp-http-server.cc.

References ns3::Time::As(), ns3::Simulator::Cancel(), ns3::Simulator::GetDelayLeft(), ns3::Simulator::IsExpired(), m_txBuffer, ns3::MakeNullCallback(), NS_LOG_FUNCTION, NS_LOG_INFO, and ns3::Time::S.

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◆ CloseSocket()

void ns3::ThreeGppHttpServerTxBuffer::CloseSocket ( Ptr< Socket > socket )

Close and remove a socket and its associated transmission buffer, and then unset the socket's callback to prevent further interaction with the socket.

This method is similar with RemoveSocket(), except that the latter does not close the socket.

After the method is completed, IsSocketAvailable() for the same pointer of socket shall return false.

Parameters

socket Pointer to the socket to be closed and removed.

Warning: Must be called only when IsSocketAvailable() for the given socket is true.

Definition at line 685 of file three-gpp-http-server.cc.

References ns3::Time::As(), ns3::Simulator::Cancel(), ns3::Simulator::GetDelayLeft(), ns3::Simulator::IsExpired(), m_txBuffer, ns3::MakeNullCallback(), NS_ASSERT_MSG, NS_LOG_FUNCTION, NS_LOG_INFO, NS_LOG_WARN, and ns3::Time::S.

Referenced by DepleteBufferSize().

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◆ DepleteBufferSize()

void ns3::ThreeGppHttpServerTxBuffer::DepleteBufferSize	(	Ptr< Socket >	socket,
		uint32_t	amount )

Decrements a buffer size by a given amount.

The content type of the object to be consumed can be inquired beforehand by the GetBufferContentType() method.

If the method has consumed all the remaining bytes within the buffer, IsBufferEmpty() for the buffer shall return true.

Parameters

socket	Pointer to the socket which is associated with the transmission buffer of interest.
amount	The length (in bytes) to be consumed (must be greater than zero).

Warning: Must be called only when IsSocketAvailable() for the given socket is true. In addition, the requested amount must be larger than the current buffer size, which can be checked by calling the GetBufferSize() method.

Definition at line 814 of file three-gpp-http-server.cc.

References CloseSocket(), m_txBuffer, NS_ASSERT_MSG, and NS_LOG_FUNCTION.

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◆ GetBufferContentType()

ThreeGppHttpHeader::ContentType_t ns3::ThreeGppHttpServerTxBuffer::GetBufferContentType ( Ptr< Socket > socket ) const

Returns ThreeGppHttpHeader::NOT_SET when the buffer is new and never been filled with any data before.

Otherwise, returns either ThreeGppHttpHeader::MAIN_OBJECT or ThreeGppHttpHeader::EMBEDDED_OBJECT.

Parameters

socket Pointer to the socket which is associated with the transmission buffer of interest

Returns: The content type of the current data inside the transmission buffer.

Warning: Must be called only when IsSocketAvailable() for the given socket is true.

Definition at line 756 of file three-gpp-http-server.cc.

References m_txBuffer, and NS_ASSERT_MSG.

◆ GetBufferSize()

uint32_t ns3::ThreeGppHttpServerTxBuffer::GetBufferSize ( Ptr< Socket > socket ) const

Parameters

socket Pointer to the socket which is associated with the transmission buffer of interest

Returns: The length (in bytes) of the current data inside the transmission buffer.

Warning: Must be called only when IsSocketAvailable() for the given socket is true.

Definition at line 764 of file three-gpp-http-server.cc.

References m_txBuffer, and NS_ASSERT_MSG.

◆ GetClientTs()

Time ns3::ThreeGppHttpServerTxBuffer::GetClientTs ( Ptr< Socket > socket ) const

Parameters

socket Pointer to the socket which is associated with the transmission buffer of interest

Returns: The client time stamp that comes from the last request packet received by the given socket. It indicates the time the request packet was transmitted by the client.

Definition at line 748 of file three-gpp-http-server.cc.

References m_txBuffer, and NS_ASSERT_MSG.

◆ HasTxedPartOfObject()

bool ns3::ThreeGppHttpServerTxBuffer::HasTxedPartOfObject ( Ptr< Socket > socket ) const

Parameters

socket pointer to the socket which is associated with the transmission buffer of interest

Returns: true if the buffer content has been read since it is written

Warning: Must be called only when IsSocketAvailable() for the given socket is true.

This method returns true after WriteNewObject() method is called. It becomes false after DepleteBufferSize() method is called.

Definition at line 772 of file three-gpp-http-server.cc.

References m_txBuffer, and NS_ASSERT_MSG.

◆ IsBufferEmpty()

bool ns3::ThreeGppHttpServerTxBuffer::IsBufferEmpty ( Ptr< Socket > socket ) const

Parameters

socket Pointer to the socket which is associated with the transmission buffer of interest.

Returns: True if the current length of the transmission buffer is zero, i.e., no pending packet.

Warning: Must be called only when IsSocketAvailable() for the given socket is true.

Definition at line 740 of file three-gpp-http-server.cc.

References m_txBuffer, and NS_ASSERT_MSG.

◆ IsSocketAvailable()

bool ns3::ThreeGppHttpServerTxBuffer::IsSocketAvailable ( Ptr< Socket > socket ) const

This method is typically used before calling other methods.

For example, AddSocket() requires that the given socket does not exist among the stored buffers. On the other hand, all the other methods that accept a pointer to a socket as an argument require the existence of a buffer allocated to the given socket.

Parameters

socket Pointer to the socket to be found.

Returns: True if the given socket is found within the buffer.

Definition at line 638 of file three-gpp-http-server.cc.

References m_txBuffer.

Referenced by AddSocket().

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◆ PrepareClose()

void ns3::ThreeGppHttpServerTxBuffer::PrepareClose ( Ptr< Socket > socket )

Tell the buffer to close the associated socket once the buffer becomes empty.

Parameters

socket Pointer to the socket which is associated with the transmission buffer of interest.

Warning: Must be called only when IsSocketAvailable() for the given socket is true.

Definition at line 839 of file three-gpp-http-server.cc.

References m_txBuffer, NS_ASSERT_MSG, and NS_LOG_FUNCTION.

◆ RecordNextServe()

void ns3::ThreeGppHttpServerTxBuffer::RecordNextServe	(	Ptr< Socket >	socket,
		const EventId &	eventId,
		const Time &	clientTs )

Informs about a pending transmission event associated with the socket, so that it would be automatically canceled in case the socket is closed.

The method also indicates the time stamp given by the client. The time stamp will be included in every packet sent.

Parameters

socket	pointer to the socket which is associated with the transmission buffer of interest
eventId	the event to be recorded, e.g., the return value of Simulator::Schedule function
clientTs	client time stamp

Warning: Must be called only when IsSocketAvailable() for the given socket is true.

Definition at line 801 of file three-gpp-http-server.cc.

References ns3::Time::As(), m_txBuffer, NS_ASSERT_MSG, NS_LOG_FUNCTION, and ns3::Time::S.

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◆ RemoveSocket()

void ns3::ThreeGppHttpServerTxBuffer::RemoveSocket ( Ptr< Socket > socket )

Remove a socket and its associated transmission buffer, and then unset the socket's callbacks to prevent further interaction with the socket.

If the socket has a pending transmission event, it will be canceled.

This method is useful for discarding a socket which is already closed, e.g., by the HTTP client. This is due to the fact that double closing of a socket may introduce undefined behaviour.

After the method is completed, IsSocketAvailable() for the same pointer of socket shall return false.

Parameters

socket Pointer to the socket to be removed.

Warning: Must be called only when IsSocketAvailable() for the given socket is true.

Definition at line 662 of file three-gpp-http-server.cc.

References ns3::Time::As(), ns3::Simulator::Cancel(), ns3::Simulator::GetDelayLeft(), ns3::Simulator::IsExpired(), m_txBuffer, ns3::MakeNullCallback(), NS_ASSERT_MSG, NS_LOG_FUNCTION, NS_LOG_INFO, and ns3::Time::S.

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◆ WriteNewObject()

void ns3::ThreeGppHttpServerTxBuffer::WriteNewObject	(	Ptr< Socket >	socket,
		ThreeGppHttpHeader::ContentType_t	contentType,
		uint32_t	objectSize )

Writes a data representing a new main object or embedded object to the transmission buffer.

The stored data can be later consumed wholly of partially by DepleteBufferSize() method.

Parameters

socket	Pointer to the socket which is associated with the transmission buffer of interest.
contentType	The content-type of the data to be written (must not equal to ThreeGppHttpHeader:NOT_SET).
objectSize	The length (in bytes) of the new object to be created (must be greater than zero).

Warning: Must be called only when both IsSocketAvailable() and IsBufferEmpty() for the given socket are true.

Definition at line 780 of file three-gpp-http-server.cc.

References m_txBuffer, ns3::ThreeGppHttpHeader::NOT_SET, NS_ASSERT_MSG, and NS_LOG_FUNCTION.

Member Data Documentation

◆ m_txBuffer

std::map<Ptr<Socket>, TxBuffer_t> ns3::ThreeGppHttpServerTxBuffer::m_txBuffer

private

Collection of accepted sockets and its individual transmission buffer.

Definition at line 539 of file three-gpp-http-server.h.

Referenced by AddSocket(), CloseAllSockets(), CloseSocket(), DepleteBufferSize(), GetBufferContentType(), GetBufferSize(), GetClientTs(), HasTxedPartOfObject(), IsBufferEmpty(), IsSocketAvailable(), PrepareClose(), RecordNextServe(), RemoveSocket(), and WriteNewObject().

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

src/applications/model/three-gpp-http-server.h
src/applications/model/three-gpp-http-server.cc

Classes

Public Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ ThreeGppHttpServerTxBuffer()

Member Function Documentation

◆ AddSocket()

◆ CloseAllSockets()

◆ CloseSocket()

◆ DepleteBufferSize()

◆ GetBufferContentType()

◆ GetBufferSize()

◆ GetClientTs()

◆ HasTxedPartOfObject()

◆ IsBufferEmpty()

◆ IsSocketAvailable()

◆ PrepareClose()

◆ RecordNextServe()

◆ RemoveSocket()

◆ WriteNewObject()

Member Data Documentation

◆ m_txBuffer