Ogre::DefaultWorkQueue Class Reference

Implementation of a general purpose request / response style background work queue. More...

#include <OgreDefaultWorkQueueStandard.h>

Inheritance diagram for Ogre::DefaultWorkQueue:

Public Types
typedef unsigned long long int	RequestID
	Numeric identifier for a request.
Public Member Functions
	DefaultWorkQueue (const String &name=StringUtil::BLANK)
virtual	~DefaultWorkQueue ()
virtual void	_threadMain ()
	Main function for each thread spawned.
virtual void	shutdown ()
virtual void	startup (bool forceRestart=true)
	DefaultWorkQueue (const String &name=StringUtil::BLANK)
virtual	~DefaultWorkQueue ()
virtual void	_threadMain ()
	Process the next request on the queue.
virtual void	shutdown ()
virtual void	startup (bool forceRestart=true)
void	_registerThreadWithRenderSystem ()
	Register the current thread with the rendersystem.
const String &	getName () const
	Get the name of the work queue.
virtual size_t	getWorkerThreadCount () const
	Get the number of worker threads that this queue will start when startup() is called.
virtual void	setWorkerThreadCount (size_t c)
	Set the number of worker threads that this queue will start when startup() is called (default 1).
virtual bool	getWorkersCanAccessRenderSystem () const
	Get whether worker threads will be allowed to access render system resources.
virtual void	setWorkersCanAccessRenderSystem (bool access)
	Set whether worker threads will be allowed to access render system resources.
virtual void	_processNextRequest ()
	Process the next request on the queue.
virtual bool	isShuttingDown () const
	Returns whether the queue is trying to shut down.
virtual void	addRequestHandler (uint16 channel, RequestHandler *rh)
virtual void	removeRequestHandler (uint16 channel, RequestHandler *rh)
virtual void	addResponseHandler (uint16 channel, ResponseHandler *rh)
virtual void	removeResponseHandler (uint16 channel, ResponseHandler *rh)
virtual RequestID	addRequest (uint16 channel, uint16 requestType, const Any &rData, uint8 retryCount=0, bool forceSynchronous=false)
virtual void	abortRequest (RequestID id)
virtual void	abortRequestsByChannel (uint16 channel)
virtual void	abortAllRequests ()
virtual void	setPaused (bool pause)
virtual bool	isPaused () const
virtual void	setRequestsAccepted (bool accept)
virtual bool	getRequestsAccepted () const
virtual void	processResponses ()
virtual unsigned long	getResponseProcessingTimeLimit () const
virtual void	setResponseProcessingTimeLimit (unsigned long ms)
virtual uint16	getChannel (const String &channelName)
	Get a channel ID for a given channel name.
void *	operator new (size_t sz, const char file, int line, const char func)
	operator new, with debug line info
void *	operator new (size_t sz)
void *	operator new (size_t sz, void *ptr)
	placement operator new
void *	operator new[] (size_t sz, const char file, int line, const char func)
	array operator new, with debug line info
void *	operator new[] (size_t sz)
void	operator delete (void *ptr)
void	operator delete (void ptr, void )
void	operator delete (void ptr, const char , int, const char *)
void	operator delete[] (void *ptr)
void	operator delete[] (void ptr, const char , int, const char *)
Protected Types
typedef deque< Request * >::type	RequestQueue
typedef deque< Response * >::type	ResponseQueue
typedef SharedPtr < RequestHandlerHolder >	RequestHandlerHolderPtr
typedef list < RequestHandlerHolderPtr > ::type	RequestHandlerList
typedef list< ResponseHandler * > ::type	ResponseHandlerList
typedef map< uint16, RequestHandlerList >::type	RequestHandlerListByChannel
typedef map< uint16, ResponseHandlerList >::type	ResponseHandlerListByChannel
typedef std::map< String, uint16 >	ChannelMap
Protected Member Functions
virtual void	waitForNextRequest ()
	To be called by a separate thread; will return immediately if there are items in the queue, or suspend the thread until new items are added otherwise.
virtual void	notifyThreadRegistered ()
	Notify that a thread has registered itself with the render system.
virtual void	notifyWorkers ()
	Notify workers about a new request.
virtual void	notifyWorkers ()
	Notify workers about a new request.
	OGRE_RW_MUTEX (mRequestHandlerMutex)
void	processRequestResponse (Request *r, bool synchronous)
Response *	processRequest (Request *r)
void	processResponse (Response *r)
void	addRequestWithRID (RequestID rid, uint16 channel, uint16 requestType, const Any &rData, uint8 retryCount)
	Put a Request on the queue with a specific RequestID.
Protected Attributes
size_t	mNumThreadsRegisteredWithRS
String	mName
size_t	mWorkerThreadCount
bool	mWorkerRenderSystemAccess
bool	mIsRunning
unsigned long	mResposeTimeLimitMS
RequestQueue	mRequestQueue
RequestQueue	mProcessQueue
ResponseQueue	mResponseQueue
WorkerFunc *	mWorkerFunc
RequestHandlerListByChannel	mRequestHandlers
ResponseHandlerListByChannel	mResponseHandlers
RequestID	mRequestCount
bool	mPaused
bool	mAcceptRequests
bool	mShuttingDown
ChannelMap	mChannelMap
uint16	mNextChannel
Private Member Functions
	OGRE_MUTEX (mRegisterRSMutex)
	Synchronise registering threads with the RenderSystem.
Private Attributes
tbb::task_scheduler_init	mTaskScheduler
tbb::task_group	mTaskGroup
std::set< tbb::tbb_thread::id >	mRegisteredThreads

Detailed Description

Implementation of a general purpose request / response style background work queue.

Remarks:: This default implementation of a work queue starts a thread pool and provides queues to process requests.; This implementation utilises tbb's task system for the WorkQueue implementation.

Definition at line 38 of file OgreDefaultWorkQueueStandard.h.

Member Typedef Documentation

typedef std::map<String, uint16> Ogre::WorkQueue::ChannelMap [protected, inherited]

Definition at line 72 of file OgreWorkQueue.h.

typedef SharedPtr<RequestHandlerHolder> Ogre::DefaultWorkQueueBase::RequestHandlerHolderPtr [protected, inherited]

Definition at line 515 of file OgreWorkQueue.h.

typedef list<RequestHandlerHolderPtr>::type Ogre::DefaultWorkQueueBase::RequestHandlerList [protected, inherited]

Definition at line 517 of file OgreWorkQueue.h.

typedef map<uint16, RequestHandlerList>::type Ogre::DefaultWorkQueueBase::RequestHandlerListByChannel [protected, inherited]

Definition at line 519 of file OgreWorkQueue.h.

typedef unsigned long long int Ogre::WorkQueue::RequestID [inherited]

Numeric identifier for a request.

Definition at line 78 of file OgreWorkQueue.h.

typedef deque<Request*>::type Ogre::DefaultWorkQueueBase::RequestQueue [protected, inherited]

Definition at line 448 of file OgreWorkQueue.h.

typedef list<ResponseHandler*>::type Ogre::DefaultWorkQueueBase::ResponseHandlerList [protected, inherited]

Definition at line 518 of file OgreWorkQueue.h.

typedef map<uint16, ResponseHandlerList>::type Ogre::DefaultWorkQueueBase::ResponseHandlerListByChannel [protected, inherited]

Definition at line 520 of file OgreWorkQueue.h.

typedef deque<Response*>::type Ogre::DefaultWorkQueueBase::ResponseQueue [protected, inherited]

Definition at line 449 of file OgreWorkQueue.h.

Constructor & Destructor Documentation

Ogre::DefaultWorkQueue::DefaultWorkQueue ( const String & name = StringUtil::BLANK )

virtual Ogre::DefaultWorkQueue::~DefaultWorkQueue ( ) [virtual]

Ogre::DefaultWorkQueue::DefaultWorkQueue ( const String & name = StringUtil::BLANK )

virtual Ogre::DefaultWorkQueue::~DefaultWorkQueue ( ) [virtual]

Member Function Documentation

virtual void Ogre::DefaultWorkQueueBase::_processNextRequest ( ) [virtual, inherited]

Process the next request on the queue.

Remarks:: This method is public, but only intended for advanced users to call. The only reason you would call this, is if you were using your own thread to drive the worker processing. The thread calling this method will be the thread used to call the RequestHandler.

void Ogre::DefaultWorkQueue::_registerThreadWithRenderSystem ( )

Register the current thread with the rendersystem.

virtual void Ogre::DefaultWorkQueue::_threadMain ( ) [virtual]

Process the next request on the queue.

Remarks:: This method is public, but only intended for advanced users to call. The only reason you would call this, is if you were using your own thread to drive the worker processing. The thread calling this method will be the thread used to call the RequestHandler. Main function for each thread spawned.

Implements Ogre::DefaultWorkQueueBase.

virtual void Ogre::DefaultWorkQueue::_threadMain ( ) [virtual]

Main function for each thread spawned.

Implements Ogre::DefaultWorkQueueBase.

virtual void Ogre::DefaultWorkQueueBase::abortAllRequests ( ) [virtual, inherited]

Abort all previously issued requests. Any requests still waiting to be processed will be removed from the queue. Any requests that are being processed will still complete.

Implements Ogre::WorkQueue.

virtual void Ogre::DefaultWorkQueueBase::abortRequest ( RequestID id ) [virtual, inherited]

Abort a previously issued request. If the request is still waiting to be processed, it will be removed from the queue.

Parameters:

id

The ID of the previously issued request.

Implements Ogre::WorkQueue.

virtual void Ogre::DefaultWorkQueueBase::abortRequestsByChannel ( uint16 channel ) [virtual, inherited]

Abort all previously issued requests in a given channel. Any requests still waiting to be processed of the given channel, will be removed from the queue.

Parameters:

channel

The type of request to be aborted

Implements Ogre::WorkQueue.

virtual RequestID Ogre::DefaultWorkQueueBase::addRequest	(	uint16	channel,
		uint16	requestType,
		const Any &	rData,
		uint8	retryCount = `0`,
		bool	forceSynchronous = `false`
	)			`[virtual, inherited]`

Add a new request to the queue.

Parameters:

	channel	The channel this request will go into = 0; the channel is the top-level categorisation of the request
	requestType	An identifier that's unique within this queue which identifies the type of the request (user decides the actual value)
	rData	The data required by the request process.
	retryCount	The number of times the request should be retried if it fails.
	forceSynchronous	Forces the request to be processed immediately even if threading is enabled.

Returns:: The ID of the request that has been added

Implements Ogre::WorkQueue.

virtual void Ogre::DefaultWorkQueueBase::addRequestHandler	(	uint16	channel,
		RequestHandler *	rh
	)			`[virtual, inherited]`

Add a request handler instance to the queue.

Remarks:: Every queue must have at least one request handler instance for each channel in which requests are raised. If you add more than one handler per channel, then you must implement canHandleRequest differently in each if you wish them to respond to different requests.

Parameters:

	channel	The channel for requests you want to handle
	rh	Your handler

Implements Ogre::WorkQueue.

void Ogre::DefaultWorkQueueBase::addRequestWithRID	(	RequestID	rid,
		uint16	channel,
		uint16	requestType,
		const Any &	rData,
		uint8	retryCount
	)			`[protected, inherited]`

Put a Request on the queue with a specific RequestID.

virtual void Ogre::DefaultWorkQueueBase::addResponseHandler	(	uint16	channel,
		ResponseHandler *	rh
	)			`[virtual, inherited]`

Add a response handler instance to the queue.

Remarks:: Every queue must have at least one response handler instance for each channel in which requests are raised. If you add more than one, then you must implement canHandleResponse differently in each if you wish them to respond to different responses.

Parameters:

	channel	The channel for responses you want to handle
	rh	Your handler

Implements Ogre::WorkQueue.

virtual uint16 Ogre::WorkQueue::getChannel ( const String & channelName ) [virtual, inherited]

Get a channel ID for a given channel name.

Remarks:: Channels are assigned on a first-come, first-served basis and are not persistent across application instances. This method allows applications to not worry about channel clashes through manually assigned channel numbers.

const String& Ogre::DefaultWorkQueueBase::getName ( ) const [inherited]

Get the name of the work queue.

virtual bool Ogre::DefaultWorkQueueBase::getRequestsAccepted ( ) const [virtual, inherited]

Returns whether requests are being accepted right now.

Implements Ogre::WorkQueue.

virtual unsigned long Ogre::DefaultWorkQueueBase::getResponseProcessingTimeLimit ( ) const [virtual, inherited]

Get the time limit imposed on the processing of responses in a single frame, in milliseconds (0 indicates no limit).

Implements Ogre::WorkQueue.

Definition at line 438 of file OgreWorkQueue.h.

virtual bool Ogre::DefaultWorkQueueBase::getWorkersCanAccessRenderSystem ( ) const [virtual, inherited]

Get whether worker threads will be allowed to access render system resources.

Accessing render system resources from a separate thread can require that a context is maintained for that thread. Also, it requires that the render system is running in threadsafe mode, which only happens when OGRE_THREAD_SUPPORT=1. This option defaults to false, which means that threads can not use GPU resources, and the render system can work in non-threadsafe mode, which is more efficient.

virtual size_t Ogre::DefaultWorkQueueBase::getWorkerThreadCount ( ) const [virtual, inherited]

Get the number of worker threads that this queue will start when startup() is called.

virtual bool Ogre::DefaultWorkQueueBase::isPaused ( ) const [virtual, inherited]

Return whether the queue is paused ie not sending more work to workers.

Implements Ogre::WorkQueue.

virtual bool Ogre::DefaultWorkQueueBase::isShuttingDown ( ) const [virtual, inherited]

Returns whether the queue is trying to shut down.

Definition at line 407 of file OgreWorkQueue.h.

virtual void Ogre::DefaultWorkQueue::notifyThreadRegistered ( ) [protected, virtual]

Notify that a thread has registered itself with the render system.

virtual void Ogre::DefaultWorkQueue::notifyWorkers ( ) [protected, virtual]

Notify workers about a new request.

Implements Ogre::DefaultWorkQueueBase.

virtual void Ogre::DefaultWorkQueue::notifyWorkers ( ) [protected, virtual]

Notify workers about a new request.

Implements Ogre::DefaultWorkQueueBase.

Ogre::DefaultWorkQueue::OGRE_MUTEX ( mRegisterRSMutex ) [private]

Synchronise registering threads with the RenderSystem.

Ogre::DefaultWorkQueueBase::OGRE_RW_MUTEX ( mRequestHandlerMutex ) [protected, inherited]

template<class Alloc >

void Ogre::AllocatedObject< Alloc >::operator delete	(	void *	ptr,
		const char *	,
		int	,
		const char *
	)			`[inherited]`

Definition at line 107 of file OgreMemoryAllocatedObject.h.

template<class Alloc >

void Ogre::AllocatedObject< Alloc >::operator delete	(	void *	ptr,
		void *
	)			`[inherited]`

Definition at line 101 of file OgreMemoryAllocatedObject.h.

template<class Alloc >

void Ogre::AllocatedObject< Alloc >::operator delete ( void * ptr ) [inherited]

Definition at line 95 of file OgreMemoryAllocatedObject.h.

template<class Alloc >

void Ogre::AllocatedObject< Alloc >::operator delete[]	(	void *	ptr,
		const char *	,
		int	,
		const char *
	)			`[inherited]`

Definition at line 118 of file OgreMemoryAllocatedObject.h.

template<class Alloc >

void Ogre::AllocatedObject< Alloc >::operator delete[] ( void * ptr ) [inherited]

Definition at line 112 of file OgreMemoryAllocatedObject.h.

template<class Alloc >

void* Ogre::AllocatedObject< Alloc >::operator new	(	size_t	sz,
		void *	ptr
	)			`[inherited]`

placement operator new

Definition at line 78 of file OgreMemoryAllocatedObject.h.

template<class Alloc >

void* Ogre::AllocatedObject< Alloc >::operator new ( size_t sz ) [inherited]

Definition at line 72 of file OgreMemoryAllocatedObject.h.

template<class Alloc >

void* Ogre::AllocatedObject< Alloc >::operator new	(	size_t	sz,
		const char *	file,
		int	line,
		const char *	func
	)			`[inherited]`

operator new, with debug line info

Definition at line 67 of file OgreMemoryAllocatedObject.h.

template<class Alloc >

void* Ogre::AllocatedObject< Alloc >::operator new[] ( size_t sz ) [inherited]

Definition at line 90 of file OgreMemoryAllocatedObject.h.

template<class Alloc >

void* Ogre::AllocatedObject< Alloc >::operator new[]	(	size_t	sz,
		const char *	file,
		int	line,
		const char *	func
	)			`[inherited]`

array operator new, with debug line info

Definition at line 85 of file OgreMemoryAllocatedObject.h.

Response* Ogre::DefaultWorkQueueBase::processRequest ( Request * r ) [protected, inherited]

void Ogre::DefaultWorkQueueBase::processRequestResponse	(	Request *	r,
		bool	synchronous
	)			`[protected, inherited]`

void Ogre::DefaultWorkQueueBase::processResponse ( Response * r ) [protected, inherited]

virtual void Ogre::DefaultWorkQueueBase::processResponses ( ) [virtual, inherited]

Process the responses in the queue.

Remarks:: This method is public, and must be called from the main render thread to 'pump' responses through the system. The method will usually try to clear all responses before returning = 0; however, you can specify a time limit on the response processing to limit the impact of spikes in demand by calling setResponseProcessingTimeLimit.

Implements Ogre::WorkQueue.

virtual void Ogre::DefaultWorkQueueBase::removeRequestHandler	(	uint16	channel,
		RequestHandler *	rh
	)			`[virtual, inherited]`

Remove a request handler.

Implements Ogre::WorkQueue.

virtual void Ogre::DefaultWorkQueueBase::removeResponseHandler	(	uint16	channel,
		ResponseHandler *	rh
	)			`[virtual, inherited]`

Remove a Response handler.

Implements Ogre::WorkQueue.

virtual void Ogre::DefaultWorkQueueBase::setPaused ( bool pause ) [virtual, inherited]

Set whether to pause further processing of any requests. If true, any further requests will simply be queued and not processed until setPaused(false) is called. Any requests which are in the process of being worked on already will still continue.

Implements Ogre::WorkQueue.

virtual void Ogre::DefaultWorkQueueBase::setRequestsAccepted ( bool accept ) [virtual, inherited]

Set whether to accept new requests or not. If true, requests are added to the queue as usual. If false, requests are silently ignored until setRequestsAccepted(true) is called.

Implements Ogre::WorkQueue.

virtual void Ogre::DefaultWorkQueueBase::setResponseProcessingTimeLimit ( unsigned long ms ) [virtual, inherited]

Set the time limit imposed on the processing of responses in a single frame, in milliseconds (0 indicates no limit). This sets the maximum time that will be spent in processResponses() in a single frame. The default is 8ms.

Implements Ogre::WorkQueue.

Definition at line 440 of file OgreWorkQueue.h.

virtual void Ogre::DefaultWorkQueueBase::setWorkersCanAccessRenderSystem ( bool access ) [virtual, inherited]

Set whether worker threads will be allowed to access render system resources.

Accessing render system resources from a separate thread can require that a context is maintained for that thread. Also, it requires that the render system is running in threadsafe mode, which only happens when OGRE_THREAD_SUPPORT=1. This option defaults to false, which means that threads can not use GPU resources, and the render system can work in non-threadsafe mode, which is more efficient. Calling this will have no effect unless the queue is shut down and restarted.

virtual void Ogre::DefaultWorkQueueBase::setWorkerThreadCount ( size_t c ) [virtual, inherited]

Set the number of worker threads that this queue will start when startup() is called (default 1).

Calling this will have no effect unless the queue is shut down and restarted.

virtual void Ogre::DefaultWorkQueue::shutdown ( ) [virtual]

Shut down the queue.

Implements Ogre::WorkQueue.

virtual void Ogre::DefaultWorkQueue::shutdown ( ) [virtual]

Shut down the queue.

Implements Ogre::WorkQueue.

virtual void Ogre::DefaultWorkQueue::startup ( bool forceRestart = true ) [virtual]

Start up the queue with the options that have been set.

Parameters:

forceRestart

If the queue is already running, whether to shut it down and restart.

Implements Ogre::WorkQueue.

virtual void Ogre::DefaultWorkQueue::startup ( bool forceRestart = true ) [virtual]

Start up the queue with the options that have been set.

Parameters:

forceRestart

If the queue is already running, whether to shut it down and restart.

Implements Ogre::WorkQueue.

virtual void Ogre::DefaultWorkQueue::waitForNextRequest ( ) [protected, virtual]

To be called by a separate thread; will return immediately if there are items in the queue, or suspend the thread until new items are added otherwise.