lunchbox::RequestHandler Class Reference

A thread-safe request handler. More...

#include <requestHandler.h>

Inheritance diagram for lunchbox::RequestHandler:

Collaboration diagram for lunchbox::RequestHandler:

List of all members.

Public Member Functions
	RequestHandler ()
	Construct a new request handler.
	~RequestHandler ()
	Destruct the request handler.
uint32_t	registerRequest (void *data=0)
	Register a new request.
void	unregisterRequest (const uint32_t requestID)
	Unregister a request.
bool	waitRequest (const uint32_t requestID, void *&result, const uint32_t timeout=LB_TIMEOUT_INDEFINITE)
	Wait a given time for the completion of a request.
bool	waitRequest (const uint32_t requestID, uint32_t &result, const uint32_t timeout=LB_TIMEOUT_INDEFINITE)
	Wait for a request with an uint32_t result.
bool	waitRequest (const uint32_t requestID, bool &result, const uint32_t timeout=LB_TIMEOUT_INDEFINITE)
	Wait for a request with a bool result.
bool	waitRequest (const uint32_t requestID, uint128_t &result, const uint32_t timeout=LB_TIMEOUT_INDEFINITE)
	Wait for a request with an uint128_t result.
bool	waitRequest (const uint32_t requestID)
	Wait for a request without a result.
bool	isRequestServed (const uint32_t requestID) const
	Poll for the completion of a request.
void *	getRequestData (const uint32_t requestID)
	Retrieve the user-specific data for a request.
void	serveRequest (const uint32_t requestID, void *result=0)
	Serve a request with a void* result.
void	serveRequest (const uint32_t requestID, uint32_t result)
	Serve a request with an uint32_t result.
void	serveRequest (const uint32_t requestID, bool result)
	Serve a request with a bool result.
void	serveRequest (const uint32_t requestID, const uint128_t &result)
	Serve a request with an uint128_t result.
bool	hasPendingRequests () const
Friends
std::ostream &	operator<< (std::ostream &, const RequestHandler &)

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Detailed Description

A thread-safe request handler.

Different execution threads can synchronize using a request handler. One thread registers a request, and later waits for the request to be served. Another thread can serve the request, providing a result value.

A note on thread-safety: Unless threadSafe is set in the constructor, the functions registerRequest(), unregisterRequest() and waitRequest() are supposed to be called from one 'waiting' thread, and the functions serveRequest() and deleteRequest() are supposed to be called only from one 'serving' thread.

Definition at line 44 of file requestHandler.h.

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Constructor & Destructor Documentation

lunchbox::RequestHandler::RequestHandler

(

)

Construct a new request handler.

Version:

1.0

lunchbox::RequestHandler::~RequestHandler

(

)

Destruct the request handler.

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Member Function Documentation

void* lunchbox::RequestHandler::getRequestData

(

const uint32_t

requestID

)

Retrieve the user-specific data for a request.

Parameters:

requestID

the request identifier.

Returns:

the user-specific data for the request.

Version:

1.0

bool lunchbox::RequestHandler::hasPendingRequests

(

)

const

Returns:

true if this request handler has pending requests.

Version:

1.0

bool lunchbox::RequestHandler::isRequestServed

(

const uint32_t

requestID

)

const

Poll for the completion of a request.

Does not unregister the request.

Parameters:

requestID

the request identifier.

Returns:

true if the request has been served, false if it is pending.

Version:

1.0

uint32_t lunchbox::RequestHandler::registerRequest

(

void *

data = 0

)

Register a new request.

Parameters:

data	a pointer to user-specific data for the request, can be 0.

Returns:

the request identifier.

Version:

1.0

void lunchbox::RequestHandler::serveRequest	(	const uint32_t	requestID,
		void *	result = 0
	)

Serve a request with a void* result.

Parameters:

requestID	the request identifier.
result	the result of the request.

Version:

1.0

void lunchbox::RequestHandler::serveRequest	(	const uint32_t	requestID,
		uint32_t	result
	)

Serve a request with an uint32_t result.

Version:

1.0

void lunchbox::RequestHandler::serveRequest	(	const uint32_t	requestID,
		bool	result
	)

Serve a request with a bool result.

Version:

1.0

void lunchbox::RequestHandler::serveRequest	(	const uint32_t	requestID,
		const uint128_t &	result
	)

Serve a request with an uint128_t result.

Version:

1.0

void lunchbox::RequestHandler::unregisterRequest

(

const uint32_t

requestID

)

Unregister a request.

Note that waitRequest automatically unregisters the request when it was successful. This method is only used when a waitRequest has timed out and the request will no longer be used.

Parameters:

requestID

the request identifier.

Version:

1.0

bool lunchbox::RequestHandler::waitRequest	(	const uint32_t	requestID,
		void *&	result,
		const uint32_t	timeout = LB_TIMEOUT_INDEFINITE
	)

Wait a given time for the completion of a request.

The request is unregistered upon successful completion, i.e, the when the method returns true.

Parameters:

requestID	the request identifier.
result	the result code of the operation.
timeout	the timeout in milliseconds to wait for the request, or LB_TIMEOUT_INDEFINITE to wait indefinitely.

Returns:

true if the request was served, false if not.

Version:

1.0

bool lunchbox::RequestHandler::waitRequest	(	const uint32_t	requestID,
		uint32_t &	result,
		const uint32_t	timeout = LB_TIMEOUT_INDEFINITE
	)

Wait for a request with an uint32_t result.

Version:

1.0

bool lunchbox::RequestHandler::waitRequest	(	const uint32_t	requestID,
		bool &	result,
		const uint32_t	timeout = LB_TIMEOUT_INDEFINITE
	)

Wait for a request with a bool result.

Version:

1.0

bool lunchbox::RequestHandler::waitRequest	(	const uint32_t	requestID,
		uint128_t &	result,
		const uint32_t	timeout = LB_TIMEOUT_INDEFINITE
	)

Wait for a request with an uint128_t result.

Version:

1.0

bool lunchbox::RequestHandler::waitRequest

(

const uint32_t

requestID

)

Wait for a request without a result.

Version:

1.0

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

• requestHandler.h