OGRE-Next  3.0.0unstable
Object-Oriented Graphics Rendering Engine
Ogre::ResourceBackgroundQueue Class Reference

This class is used to perform Resource operations in a background thread. More...

#include <OgreResourceBackgroundQueue.h>

+ Inheritance diagram for Ogre::ResourceBackgroundQueue:

Classes

class  Listener
 This abstract listener interface lets you get notifications of completed background processes instead of having to poll ticket statuses. More...
 

Public Member Functions

 ResourceBackgroundQueue ()
 
 ~ResourceBackgroundQueue () override
 
void abortRequest (BackgroundProcessTicket ticket)
 Aborts background process. More...
 
bool canHandleRequest (const WorkQueue::Request *req, const WorkQueue *srcQ) override
 Implementation for WorkQueue::RequestHandler. More...
 
bool canHandleResponse (const WorkQueue::Response *res, const WorkQueue *srcQ) override
 Implementation for WorkQueue::ResponseHandler. More...
 
WorkQueue::ResponsehandleRequest (const WorkQueue::Request *req, const WorkQueue *srcQ) override
 Implementation for WorkQueue::RequestHandler. More...
 
void handleResponse (const WorkQueue::Response *res, const WorkQueue *srcQ) override
 Implementation for WorkQueue::ResponseHandler. More...
 
virtual void initialise ()
 Initialise the background queue system. More...
 
virtual BackgroundProcessTicket initialiseAllResourceGroups (Listener *listener=0)
 Initialise all resource groups which are yet to be initialised in the background. More...
 
virtual BackgroundProcessTicket initialiseResourceGroup (const String &name, Listener *listener=0)
 Initialise a resource group in the background. More...
 
virtual bool isProcessComplete (BackgroundProcessTicket ticket)
 Returns whether a previously queued process has completed or not. More...
 
virtual BackgroundProcessTicket load (const String &resType, const String &name, const String &group, bool isManual=false, ManualResourceLoader *loader=0, const NameValuePairList *loadParams=0, Listener *listener=0)
 Load a single resource in the background. More...
 
virtual BackgroundProcessTicket loadResourceGroup (const String &name, Listener *listener=0)
 Loads a resource group in the background. More...
 
virtual BackgroundProcessTicket prepare (const String &resType, const String &name, const String &group, bool isManual=false, ManualResourceLoader *loader=0, const NameValuePairList *loadParams=0, Listener *listener=0)
 Prepare a single resource in the background. More...
 
virtual BackgroundProcessTicket prepareResourceGroup (const String &name, Listener *listener=0)
 Prepares a resource group in the background. More...
 
virtual void shutdown ()
 Shut down the background queue system. More...
 
virtual BackgroundProcessTicket unload (const String &resType, const String &name, Listener *listener=0)
 Unload a single resource in the background. More...
 
virtual BackgroundProcessTicket unload (const String &resType, ResourceHandle handle, Listener *listener=0)
 Unload a single resource in the background. More...
 
virtual BackgroundProcessTicket unloadResourceGroup (const String &name, Listener *listener=0)
 Unloads a resource group in the background. More...
 
- Public Member Functions inherited from Ogre::Singleton< ResourceBackgroundQueue >
 Singleton ()
 
 ~Singleton ()
 
- Public Member Functions inherited from Ogre::WorkQueue::RequestHandler
 RequestHandler ()
 
virtual ~RequestHandler ()
 
- Public Member Functions inherited from Ogre::WorkQueue::ResponseHandler
 ResponseHandler ()
 
virtual ~ResponseHandler ()
 

Static Public Member Functions

static ResourceBackgroundQueuegetSingleton ()
 Override standard Singleton retrieval. More...
 
static ResourceBackgroundQueuegetSingletonPtr ()
 Override standard Singleton retrieval. More...
 
- Static Public Member Functions inherited from Ogre::Singleton< ResourceBackgroundQueue >
static ResourceBackgroundQueuegetSingleton ()
 
static ResourceBackgroundQueuegetSingletonPtr ()
 

Detailed Description

This class is used to perform Resource operations in a background thread.

Remarks
All these requests are now queued via Root::getWorkQueue in order to share the thread pool amongst all background tasks. You should therefore refer to that class for configuring the behaviour of the threads themselves, this class merely provides an interface that is specific to resource loading around this common functionality.
The general approach here is that on requesting a background resource process, your request is placed on a queue ready for the background thread to be picked up, and you will get a 'ticket' back, identifying the request. Your call will then return and your thread can proceed, knowing that at some point in the background the operation will be performed. In it's own thread, the resource operation will be performed, and once finished the ticket will be marked as complete. You can check the status of tickets by calling isProcessComplete() from your queueing thread.

Constructor & Destructor Documentation

◆ ResourceBackgroundQueue()

Ogre::ResourceBackgroundQueue::ResourceBackgroundQueue ( )

◆ ~ResourceBackgroundQueue()

Ogre::ResourceBackgroundQueue::~ResourceBackgroundQueue ( )
override

Member Function Documentation

◆ abortRequest()

void Ogre::ResourceBackgroundQueue::abortRequest ( BackgroundProcessTicket  ticket)

Aborts background process.

◆ canHandleRequest()

bool Ogre::ResourceBackgroundQueue::canHandleRequest ( const WorkQueue::Request req,
const WorkQueue srcQ 
)
overridevirtual

Implementation for WorkQueue::RequestHandler.

Reimplemented from Ogre::WorkQueue::RequestHandler.

◆ canHandleResponse()

bool Ogre::ResourceBackgroundQueue::canHandleResponse ( const WorkQueue::Response res,
const WorkQueue srcQ 
)
overridevirtual

Implementation for WorkQueue::ResponseHandler.

Reimplemented from Ogre::WorkQueue::ResponseHandler.

◆ getSingleton()

static ResourceBackgroundQueue& Ogre::ResourceBackgroundQueue::getSingleton ( )
static

Override standard Singleton retrieval.

Remarks
Why do we do this? Well, it's because the Singleton implementation is in a .h file, which means it gets compiled into anybody who includes it. This is needed for the Singleton template to work, but we actually only want it compiled into the implementation of the class based on the Singleton, not all of them. If we don't change this, we get link errors when trying to use the Singleton-based class from an outside dll.
This method just delegates to the template version anyway, but the implementation stays in this single compilation unit, preventing link errors.

◆ getSingletonPtr()

static ResourceBackgroundQueue* Ogre::ResourceBackgroundQueue::getSingletonPtr ( )
static

Override standard Singleton retrieval.

Remarks
Why do we do this? Well, it's because the Singleton implementation is in a .h file, which means it gets compiled into anybody who includes it. This is needed for the Singleton template to work, but we actually only want it compiled into the implementation of the class based on the Singleton, not all of them. If we don't change this, we get link errors when trying to use the Singleton-based class from an outside dll.
This method just delegates to the template version anyway, but the implementation stays in this single compilation unit, preventing link errors.

◆ handleRequest()

WorkQueue::Response* Ogre::ResourceBackgroundQueue::handleRequest ( const WorkQueue::Request req,
const WorkQueue srcQ 
)
overridevirtual

◆ handleResponse()

void Ogre::ResourceBackgroundQueue::handleResponse ( const WorkQueue::Response res,
const WorkQueue srcQ 
)
overridevirtual

◆ initialise()

virtual void Ogre::ResourceBackgroundQueue::initialise ( )
virtual

Initialise the background queue system.

Note
Called automatically by Root::initialise.

◆ initialiseAllResourceGroups()

virtual BackgroundProcessTicket Ogre::ResourceBackgroundQueue::initialiseAllResourceGroups ( Listener listener = 0)
virtual

Initialise all resource groups which are yet to be initialised in the background.

See also
ResourceGroupManager::intialiseResourceGroup
Parameters
listenerOptional callback interface, take note of warnings in the header and only use if you understand them.
Returns
Ticket identifying the request, use isProcessComplete() to determine if completed if not using listener

◆ initialiseResourceGroup()

virtual BackgroundProcessTicket Ogre::ResourceBackgroundQueue::initialiseResourceGroup ( const String name,
Listener listener = 0 
)
virtual

Initialise a resource group in the background.

See also
ResourceGroupManager::initialiseResourceGroup
Parameters
nameThe name of the resource group to initialise
listenerOptional callback interface, take note of warnings in the header and only use if you understand them.
Returns
Ticket identifying the request, use isProcessComplete() to determine if completed if not using listener

◆ isProcessComplete()

virtual bool Ogre::ResourceBackgroundQueue::isProcessComplete ( BackgroundProcessTicket  ticket)
virtual

Returns whether a previously queued process has completed or not.

Remarks
This method of checking that a background process has completed is the 'polling' approach. Each queued method takes an optional listener parameter to allow you to register a callback instead, which is arguably more efficient.
Parameters
ticketThe ticket which was returned when the process was queued
Returns
true if process has completed (or if the ticket is unrecognised), false otherwise
Note
Tickets are not stored once complete so do not accumulate over time. This is why a non-existent ticket will return 'true'.

◆ load()

virtual BackgroundProcessTicket Ogre::ResourceBackgroundQueue::load ( const String resType,
const String name,
const String group,
bool  isManual = false,
ManualResourceLoader loader = 0,
const NameValuePairList loadParams = 0,
Listener listener = 0 
)
virtual

Load a single resource in the background.

See also
ResourceManager::load
Parameters
resTypeThe type of the resource (from ResourceManager::getResourceType())
nameThe name of the Resource
groupThe resource group to which this resource will belong
isManualIs the resource to be manually loaded? If so, you should provide a value for the loader parameter
loaderThe manual loader which is to perform the required actions when this resource is loaded; only applicable when you specify true for the previous parameter. NOTE: must be thread safe!!
loadParamsOptional pointer to a list of name/value pairs containing loading parameters for this type of resource. Remember that this must have a lifespan longer than the return of this call!

◆ loadResourceGroup()

virtual BackgroundProcessTicket Ogre::ResourceBackgroundQueue::loadResourceGroup ( const String name,
Listener listener = 0 
)
virtual

Loads a resource group in the background.

See also
ResourceGroupManager::loadResourceGroup
Parameters
nameThe name of the resource group to load
listenerOptional callback interface, take note of warnings in the header and only use if you understand them.
Returns
Ticket identifying the request, use isProcessComplete() to determine if completed if not using listener

◆ prepare()

virtual BackgroundProcessTicket Ogre::ResourceBackgroundQueue::prepare ( const String resType,
const String name,
const String group,
bool  isManual = false,
ManualResourceLoader loader = 0,
const NameValuePairList loadParams = 0,
Listener listener = 0 
)
virtual

Prepare a single resource in the background.

See also
ResourceManager::prepare
Parameters
resTypeThe type of the resource (from ResourceManager::getResourceType())
nameThe name of the Resource
groupThe resource group to which this resource will belong
isManualIs the resource to be manually loaded? If so, you should provide a value for the loader parameter
loaderThe manual loader which is to perform the required actions when this resource is loaded; only applicable when you specify true for the previous parameter. NOTE: must be thread safe!!
loadParamsOptional pointer to a list of name/value pairs containing loading parameters for this type of resource. Remember that this must have a lifespan longer than the return of this call!

◆ prepareResourceGroup()

virtual BackgroundProcessTicket Ogre::ResourceBackgroundQueue::prepareResourceGroup ( const String name,
Listener listener = 0 
)
virtual

Prepares a resource group in the background.

See also
ResourceGroupManager::prepareResourceGroup
Parameters
nameThe name of the resource group to prepare
listenerOptional callback interface, take note of warnings in the header and only use if you understand them.
Returns
Ticket identifying the request, use isProcessComplete() to determine if completed if not using listener

◆ shutdown()

virtual void Ogre::ResourceBackgroundQueue::shutdown ( )
virtual

Shut down the background queue system.

Note
Called automatically by Root::shutdown.

◆ unload() [1/2]

virtual BackgroundProcessTicket Ogre::ResourceBackgroundQueue::unload ( const String resType,
const String name,
Listener listener = 0 
)
virtual

Unload a single resource in the background.

See also
ResourceManager::unload
Parameters
resTypeThe type of the resource (from ResourceManager::getResourceType())
nameThe name of the Resource

◆ unload() [2/2]

virtual BackgroundProcessTicket Ogre::ResourceBackgroundQueue::unload ( const String resType,
ResourceHandle  handle,
Listener listener = 0 
)
virtual

Unload a single resource in the background.

See also
ResourceManager::unload
Parameters
resTypeThe type of the resource (from ResourceManager::getResourceType())
handleHandle to the resource

◆ unloadResourceGroup()

virtual BackgroundProcessTicket Ogre::ResourceBackgroundQueue::unloadResourceGroup ( const String name,
Listener listener = 0 
)
virtual

Unloads a resource group in the background.

See also
ResourceGroupManager::unloadResourceGroup
Parameters
nameThe name of the resource group to load
Returns
Ticket identifying the request, use isProcessComplete() to determine if completed if not using listener

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