Main Page | Namespace List | Class Hierarchy | Alphabetical List | Class List | File List | Namespace Members | Class Members | File Members | Related Pages

Ogre::ResourceManager Class Reference

Defines a generic resource handler. More...

#include <OgreResourceManager.h>

Inheritance diagram for Ogre::ResourceManager:

Ogre::ScriptLoader Ogre::BspResourceManager Ogre::CompositorManager Ogre::FontManager Ogre::GpuProgramManager Ogre::HighLevelGpuProgramManager Ogre::MaterialManager Ogre::MeshManager Ogre::SkeletonManager Ogre::TextureManager List of all members.

Public Types

typedef HashMap< String, ResourcePtr > ResourceMap
typedef std::map< ResourceHandle,
ResourcePtr > 		ResourceHandleMap
typedef MapIterator< ResourceHandleMap > ResourceMapIterator

Public Member Functions

OGRE_AUTO_MUTEX ResourceManager ()
virtual ~ResourceManager ()
virtual ResourcePtr create (const String &name, const String &group, bool isManual=false, ManualResourceLoader *loader=0, const NameValuePairList *createParams=0)
 Creates a new blank resource, but does not immediately load it.

virtual void setMemoryBudget (size_t bytes)
 Set a limit on the amount of memory this resource handler may use.

virtual size_t getMemoryBudget (void) const
 Get the limit on the amount of memory this resource handler may use.

virtual void unload (const String &name)
 Unloads a single resource by name.

virtual void unload (ResourceHandle handle)
 Unloads a single resource by handle.

virtual void unloadAll (bool reloadableOnly=true)
 Unloads all resources.

virtual void reloadAll (bool reloadableOnly=true)
 Caused all currently loaded resources to be reloaded.

virtual void unloadUnreferencedResources (bool reloadableOnly=true)
 Unload all resources which are not referenced by any other object.

virtual void reloadUnreferencedResources (bool reloadableOnly=true)
 Caused all currently loaded but not referenced by any other object resources to be reloaded.

virtual void remove (ResourcePtr &r)
 Remove a single resource.

virtual void remove (const String &name)
 Remove a single resource by name.

virtual void remove (ResourceHandle handle)
 Remove a single resource by handle.

virtual void removeAll (void)
 Removes all resources.

virtual ResourcePtr getByName (const String &name)
 Retrieves a pointer to a resource by name, or null if the resource does not exist.

virtual ResourcePtr getByHandle (ResourceHandle handle)
 Retrieves a pointer to a resource by handle, or null if the resource does not exist.

virtual bool resourceExists (const String &name)
 Returns whether the named resource exists in this manager.

virtual bool resourceExists (ResourceHandle handle)
 Returns whether a resource with the given handle exists in this manager.

virtual void _notifyResourceTouched (Resource *res)
 Notify this manager that a resource which it manages has been 'touched', ie used.

virtual void _notifyResourceLoaded (Resource *res)
 Notify this manager that a resource which it manages has been loaded.

virtual void _notifyResourceUnloaded (Resource *res)
 Notify this manager that a resource which it manages has been unloaded.

virtual ResourcePtr load (const String &name, const String &group, bool isManual=false, ManualResourceLoader *loader=0, const NameValuePairList *loadParams=0)
 Generic load method, used to create a Resource specific to this ResourceManager without using one of the specialised 'load' methods (containing per-Resource-type parameters).

virtual const StringVector & getScriptPatterns (void) const
 Gets the file patterns which should be used to find scripts for this ResourceManager.

virtual void parseScript (DataStreamPtr &stream, const String &groupName)
 Parse the definition of a set of resources from a script file.

virtual Real getLoadingOrder (void) const
 Gets the relative loading order of resources of this type.

const String & getResourceType (void) const
 Gets a string identifying the type of resource this manager handles.

ResourceMapIterator getResourceIterator (void)
 Returns an iterator over all resources in this manager.


Protected Member Functions

ResourceHandle getNextHandle (void)
 Allocates the next handle.

virtual Resource * createImpl (const String &name, ResourceHandle handle, const String &group, bool isManual, ManualResourceLoader *loader, const NameValuePairList *createParams)=0
 Create a new resource instance compatible with this manager (no custom parameters are populated at this point).

virtual void addImpl (ResourcePtr &res)
 Add a newly created resource to the manager (note weak reference).

virtual void removeImpl (ResourcePtr &res)
 Remove a resource from this manager; remove it from the lists.

virtual void checkUsage (void)
 Checks memory usage and pages out if required.

virtual size_t getMemoryUsage (void) const
 Gets the current memory usage, in bytes.


Protected Attributes

ResourceHandleMap mResourcesByHandle
ResourceMap mResources
ResourceHandle mNextHandle
size_t mMemoryBudget
size_t mMemoryUsage
StringVector mScriptPatterns
 Patterns to use to look for scripts if supported (e.g. *.overlay).

Real mLoadOrder
 Loading order relative to other managers, higher is later.

String mResourceType
 String identifying the resource type this manager handles.

Detailed Description

Defines a generic resource handler.

Remarks:
A resource manager is responsible for managing a pool of resources of a particular type. It must index them, look them up, load and destroy them. It may also need to stay within a defined memory budget, and temporaily unload some resources if it needs to to stay within this budget.
Resource managers use a priority system to determine what can be unloaded, and a Least Recently Used (LRU) policy within resources of the same priority.
Resources can be loaded using the generalised load interface, and they can be unloaded and removed. In addition, each subclass of ResourceManager will likely define custom 'load' methods which take explicit parameters depending on the kind of resource being created.
Note:
Resources can be loaded and unloaded through the Resource class, but they can only be removed (and thus eventually destroyed) using their parent ResourceManager.

If OGRE_THREAD_SUPPORT is 1, this class is thread-safe.

Definition at line 64 of file OgreResourceManager.h.

Member Typedef Documentation

typedef std::map<ResourceHandle, ResourcePtr> Ogre::ResourceManager::ResourceHandleMap
 

Definition at line 387 of file OgreResourceManager.h.

typedef HashMap< String, ResourcePtr > Ogre::ResourceManager::ResourceMap
 

Definition at line 386 of file OgreResourceManager.h.

typedef MapIterator<ResourceHandleMap> Ogre::ResourceManager::ResourceMapIterator
 

Definition at line 405 of file OgreResourceManager.h.

Referenced by getResourceIterator().

Constructor & Destructor Documentation

OGRE_AUTO_MUTEX Ogre::ResourceManager::ResourceManager (   ) 
 

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

Member Function Documentation

virtual void Ogre::ResourceManager::_notifyResourceLoaded (  Resource *  res  )  [virtual]
 

Notify this manager that a resource which it manages has been loaded.

virtual void Ogre::ResourceManager::_notifyResourceTouched (  Resource *  res  )  [virtual]
 

Notify this manager that a resource which it manages has been 'touched', ie used.

virtual void Ogre::ResourceManager::_notifyResourceUnloaded (  Resource *  res  )  [virtual]
 

Notify this manager that a resource which it manages has been unloaded.

virtual void Ogre::ResourceManager::addImpl (  ResourcePtr &  res  )  [protected, virtual]
 

Add a newly created resource to the manager (note weak reference).

virtual void Ogre::ResourceManager::checkUsage (  void   )  [protected, virtual]
 

Checks memory usage and pages out if required.

virtual ResourcePtr Ogre::ResourceManager::create (  const String &  name,
const String &  group,
bool  isManual = false,
ManualResourceLoader *  loader = 0,
const NameValuePairList *  createParams = 0
)  [virtual]
 

Creates a new blank resource, but does not immediately load it.

Remarks:
Resource managers handle disparate types of resources, so if you want to get at the detailed interface of this resource, you'll have to cast the result to the subclass you know you're creating.
Parameters:
name The unique name of the resource
group The name of the resource group to attach this new resource to
isManual Is this resource manually loaded? If so, you should really populate the loader parameter in order that the load process can call the loader back when loading is required.
loader Pointer to a ManualLoader implementation which will be called when the Resource wishes to load (should be supplied if you set isManual to true). You can in fact leave this parameter null if you wish, but the Resource will never be able to reload if anything ever causes it to unload. Therefore provision of a proper ManualLoader instance is strongly recommended.
createParams If any parameters are required to create an instance, they should be supplied here as name / value pairs

virtual Resource* Ogre::ResourceManager::createImpl (  const String &  name,
ResourceHandle  handle,
const String &  group,
bool  isManual,
ManualResourceLoader *  loader,
const NameValuePairList *  createParams
)  [protected, pure virtual]
 

Create a new resource instance compatible with this manager (no custom parameters are populated at this point).

Remarks:
Subclasses must override this method and create a subclass of Resource.
Parameters:
name The unique name of the resource
group The name of the resource group to attach this new resource to
isManual Is this resource manually loaded? If so, you should really populate the loader parameter in order that the load process can call the loader back when loading is required.
loader Pointer to a ManualLoader implementation which will be called when the Resource wishes to load (should be supplied if you set isManual to true). You can in fact leave this parameter null if you wish, but the Resource will never be able to reload if anything ever causes it to unload. Therefore provision of a proper ManualLoader instance is strongly recommended.
createParams If any parameters are required to create an instance, they should be supplied here as name / value pairs. These do not need to be set on the instance (handled elsewhere), just used if required to differentiate which concrete class is created.

Implemented in Ogre::CompositorManager, Ogre::FontManager, Ogre::HighLevelGpuProgramManager, Ogre::MaterialManager, Ogre::MeshManager, Ogre::SkeletonManager, Ogre::BspResourceManager, Ogre::D3D9GpuProgramManager, Ogre::D3D9TextureManager, Ogre::GLGpuProgramManager, and Ogre::GLTextureManager.

virtual ResourcePtr Ogre::ResourceManager::getByHandle (  ResourceHandle  handle  )  [virtual]
 

Retrieves a pointer to a resource by handle, or null if the resource does not exist.

virtual ResourcePtr Ogre::ResourceManager::getByName (  const String &  name  )  [virtual]
 

Retrieves a pointer to a resource by name, or null if the resource does not exist.

virtual Real Ogre::ResourceManager::getLoadingOrder (  void   )  const [virtual]
 

Gets the relative loading order of resources of this type.

Remarks:
There are dependencies between some kinds of resource in terms of loading order, and this value enumerates that. Higher values load later during bulk loading tasks.

Implements Ogre::ScriptLoader.

Definition at line 340 of file OgreResourceManager.h.

References Ogre::Real.

virtual size_t Ogre::ResourceManager::getMemoryBudget (  void   )  const [virtual]
 

Get the limit on the amount of memory this resource handler may use.

virtual size_t Ogre::ResourceManager::getMemoryUsage (  void   )  const [protected, virtual]
 

Gets the current memory usage, in bytes.

Definition at line 382 of file OgreResourceManager.h.

ResourceHandle Ogre::ResourceManager::getNextHandle (  void   )  [protected]
 

Allocates the next handle.

ResourceMapIterator Ogre::ResourceManager::getResourceIterator (  void   ) 
 

Returns an iterator over all resources in this manager.

Note:
Use of this iterator is NOT thread safe!

Definition at line 410 of file OgreResourceManager.h.

References ResourceMapIterator.

const String& Ogre::ResourceManager::getResourceType (  void   )  const
 

Gets a string identifying the type of resource this manager handles.

Definition at line 343 of file OgreResourceManager.h.

References Ogre::String.

virtual const StringVector& Ogre::ResourceManager::getScriptPatterns (  void   )  const [virtual]
 

Gets the file patterns which should be used to find scripts for this ResourceManager.

Remarks:
Some resource managers can read script files in order to define resources ahead of time. These resources are added to the available list inside the manager, but none are loaded initially. This allows you to load the items that are used on demand, or to load them all as a group if you wish (through ResourceGroupManager).
This method lets you determine the file pattern which will be used to identify scripts intended for this manager.
Returns:
A list of file patterns, in the order they should be searched in.
See also:
isScriptingSupported, parseScript

Implements Ogre::ScriptLoader.

Definition at line 317 of file OgreResourceManager.h.

References Ogre::StringVector.

virtual ResourcePtr Ogre::ResourceManager::load (  const String &  name,
const String &  group,
bool  isManual = false,
ManualResourceLoader *  loader = 0,
const NameValuePairList *  loadParams = 0
)  [virtual]
 

Generic load method, used to create a Resource specific to this ResourceManager without using one of the specialised 'load' methods (containing per-Resource-type parameters).

Parameters:
name The name of the Resource
group The resource group to which this resource will belong
isManual Is the resource to be manually loaded? If so, you should provide a value for the loader parameter
loader The manual loader which is to perform the required actions when this resource is loaded; only applicable when you specify true for the previous parameter
loadParams Optional pointer to a list of name/value pairs containing loading parameters for this type of resource.

Reimplemented in Ogre::BspResourceManager.

virtual void Ogre::ResourceManager::parseScript (  DataStreamPtr &  stream,
const String &  groupName
)  [virtual]
 

Parse the definition of a set of resources from a script file.

Remarks:
Some resource managers can read script files in order to define resources ahead of time. These resources are added to the available list inside the manager, but none are loaded initially. This allows you to load the items that are used on demand, or to load them all as a group if you wish (through ResourceGroupManager).
Parameters:
stream Weak reference to a data stream which is the source of the script
groupName The name of the resource group that resources which are parsed are to become a member of. If this group is loaded or unloaded, then the resources discovered in this script will be loaded / unloaded with it.

Implements Ogre::ScriptLoader.

Reimplemented in Ogre::CompositorManager, Ogre::FontManager, and Ogre::MaterialManager.

Definition at line 332 of file OgreResourceManager.h.

References Ogre::DataStreamPtr, and Ogre::String.

virtual void Ogre::ResourceManager::reloadAll (  bool  reloadableOnly = true  )  [virtual]
 

Caused all currently loaded resources to be reloaded.

Remarks:
All resources currently being held in this manager which are also marked as currently loaded will be unloaded, then loaded again.
Parameters:
reloadableOnly If true (the default), only reload the resource that is reloadable. Because some resources isn't reloadable, they will be unloaded but can't loaded again. Thus, you might not want to them unloaded. Or, you might unload all of them, and then populate them manually later.
See also:
Resource::isReloadable for resource is reloadable.

virtual void Ogre::ResourceManager::reloadUnreferencedResources (  bool  reloadableOnly = true  )  [virtual]
 

Caused all currently loaded but not referenced by any other object resources to be reloaded.

Remarks:
This method behaves like reloadAll, except that it only reloads resources which are not in use, ie not referenced by other objects.
Some referenced resource may exists 'weak' pointer to their sub-components (e.g. Entity held pointer to SubMesh), in this case, unload or reload that resource will cause dangerous pointer access. Use this function instead of reloadAll allows you avoid fail in those situations.
Parameters:
reloadableOnly If true (the default), only reloads resources which can be subsequently automatically reloaded.

virtual void Ogre::ResourceManager::remove (  ResourceHandle  handle  )  [virtual]
 

Remove a single resource by handle.

Remarks:
Removes a single resource, meaning it will be removed from the list of valid resources in this manager, also causing it to be unloaded.
Note:
The word 'Destroy' is not used here, since if any other pointers are referring to this resource, it will persist until they have finished with it; however to all intents and purposes it no longer exists and will likely get destroyed imminently.

If you do have shared pointers to resources hanging around after the ResourceManager is destroyed, you may get problems on destruction of these resources if they were relying on the manager (especially if it is a plugin). If you find you get problems on shutdown in the destruction of resources, try making sure you release all your shared pointers before you shutdown OGRE.

virtual void Ogre::ResourceManager::remove (  const String &  name  )  [virtual]
 

Remove a single resource by name.

Remarks:
Removes a single resource, meaning it will be removed from the list of valid resources in this manager, also causing it to be unloaded.
Note:
The word 'Destroy' is not used here, since if any other pointers are referring to this resource, it will persist until they have finished with it; however to all intents and purposes it no longer exists and will likely get destroyed imminently.

If you do have shared pointers to resources hanging around after the ResourceManager is destroyed, you may get problems on destruction of these resources if they were relying on the manager (especially if it is a plugin). If you find you get problems on shutdown in the destruction of resources, try making sure you release all your shared pointers before you shutdown OGRE.

virtual void Ogre::ResourceManager::remove (  ResourcePtr &  r  )  [virtual]
 

Remove a single resource.

Remarks:
Removes a single resource, meaning it will be removed from the list of valid resources in this manager, also causing it to be unloaded.
Note:
The word 'Destroy' is not used here, since if any other pointers are referring to this resource, it will persist until they have finished with it; however to all intents and purposes it no longer exists and will likely get destroyed imminently.

If you do have shared pointers to resources hanging around after the ResourceManager is destroyed, you may get problems on destruction of these resources if they were relying on the manager (especially if it is a plugin). If you find you get problems on shutdown in the destruction of resources, try making sure you release all your shared pointers before you shutdown OGRE.

virtual void Ogre::ResourceManager::removeAll (  void   )  [virtual]
 

Removes all resources.

Note:
The word 'Destroy' is not used here, since if any other pointers are referring to these resources, they will persist until they have been finished with; however to all intents and purposes the resources no longer exist and will get destroyed imminently.

If you do have shared pointers to resources hanging around after the ResourceManager is destroyed, you may get problems on destruction of these resources if they were relying on the manager (especially if it is a plugin). If you find you get problems on shutdown in the destruction of resources, try making sure you release all your shared pointers before you shutdown OGRE.

Reimplemented in Ogre::CompositorManager.

virtual void Ogre::ResourceManager::removeImpl (  ResourcePtr &  res  )  [protected, virtual]
 

Remove a resource from this manager; remove it from the lists.

virtual bool Ogre::ResourceManager::resourceExists (  ResourceHandle  handle  )  [virtual]
 

Returns whether a resource with the given handle exists in this manager.

Definition at line 265 of file OgreResourceManager.h.

References Ogre::SharedPtr< T >::isNull(), and Ogre::ResourceHandle.

virtual bool Ogre::ResourceManager::resourceExists (  const String &  name  )  [virtual]
 

Returns whether the named resource exists in this manager.

Definition at line 260 of file OgreResourceManager.h.

References Ogre::SharedPtr< T >::isNull(), and Ogre::String.

virtual void Ogre::ResourceManager::setMemoryBudget (  size_t  bytes  )  [virtual]
 

Set a limit on the amount of memory this resource handler may use.

Remarks:
If, when asked to load a new resource, the manager believes it will exceed this memory budget, it will temporarily unload a resource to make room for the new one. This unloading is not permanent and the Resource is not destroyed; it simply needs to be reloaded when next used.

virtual void Ogre::ResourceManager::unload (  ResourceHandle  handle  )  [virtual]
 

Unloads a single resource by handle.

Remarks:
Unloaded resources are not removed, they simply free up their memory as much as they can and wait to be reloaded.
See also:
ResourceGroupManager for unloading of resource groups.

virtual void Ogre::ResourceManager::unload (  const String &  name  )  [virtual]
 

Unloads a single resource by name.

Remarks:
Unloaded resources are not removed, they simply free up their memory as much as they can and wait to be reloaded.
See also:
ResourceGroupManager for unloading of resource groups.

virtual void Ogre::ResourceManager::unloadAll (  bool  reloadableOnly = true  )  [virtual]
 

Unloads all resources.

Remarks:
Unloaded resources are not removed, they simply free up their memory as much as they can and wait to be reloaded.
See also:
ResourceGroupManager for unloading of resource groups.
Parameters:
reloadableOnly If true (the default), only unload the resource that is reloadable. Because some resources isn't reloadable, they will be unloaded but can't load them later. Thus, you might not want to them unloaded. Or, you might unload all of them, and then populate them manually later.
See also:
Resource::isReloadable for resource is reloadable.

virtual void Ogre::ResourceManager::unloadUnreferencedResources (  bool  reloadableOnly = true  )  [virtual]
 

Unload all resources which are not referenced by any other object.

Remarks:
This method behaves like unloadAll, except that it only unloads resources which are not in use, ie not referenced by other objects. This allows you to free up some memory selectively whilst still keeping the group around (and the resources present, just not using much memory).
Some referenced resource may exists 'weak' pointer to their sub-components (e.g. Entity held pointer to SubMesh), in this case, unload or reload that resource will cause dangerous pointer access. Use this function instead of unloadAll allows you avoid fail in those situations.
Parameters:
reloadableOnly If true (the default), only unloads resources which can be subsequently automatically reloaded.

Member Data Documentation

Real Ogre::ResourceManager::mLoadOrder [protected]
 

Loading order relative to other managers, higher is later.

Definition at line 400 of file OgreResourceManager.h.

size_t Ogre::ResourceManager::mMemoryBudget [protected]
 

Definition at line 392 of file OgreResourceManager.h.

size_t Ogre::ResourceManager::mMemoryUsage [protected]
 

Definition at line 393 of file OgreResourceManager.h.

ResourceHandle Ogre::ResourceManager::mNextHandle [protected]
 

Definition at line 391 of file OgreResourceManager.h.

ResourceMap Ogre::ResourceManager::mResources [protected]
 

Definition at line 390 of file OgreResourceManager.h.

ResourceHandleMap Ogre::ResourceManager::mResourcesByHandle [protected]
 

Definition at line 389 of file OgreResourceManager.h.

String Ogre::ResourceManager::mResourceType [protected]
 

String identifying the resource type this manager handles.

Definition at line 402 of file OgreResourceManager.h.

StringVector Ogre::ResourceManager::mScriptPatterns [protected]
 

Patterns to use to look for scripts if supported (e.g. *.overlay).

Definition at line 398 of file OgreResourceManager.h.

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

Copyright © 2000-2005 by The OGRE Team
Creative Commons License
This work is licensed under a Creative Commons Attribution-ShareAlike 2.5 License.
Last modified Sun Mar 12 14:42:45 2006