85 lines
2.1 KiB
C++
85 lines
2.1 KiB
C++
/*
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* Copyright 2002, Marcus Overhagen. All rights reserved.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _DORMANT_NODE_MANAGER_H
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#define _DORMANT_NODE_MANAGER_H
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#include <map>
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#include <Locker.h>
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#include <MediaAddOn.h>
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class BPath;
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namespace BPrivate {
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namespace media {
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// To instantiate a dormant node in the current address space, we need to
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// either load the add-on from file and create a new BMediaAddOn class and
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// cache the BMediaAddOn after that for later reuse, or reuse the cached
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// BMediaAddOn if we already have one.
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// This is handled by the DormantNodeManager.
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//
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// GetAddon() will provide a ready to use BMediaAddOn, while
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// PutAddonDelayed() will unload it when it's no longer needed,
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// but will delay the unloading slightly, because it is called
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// from a node destructor of the loaded add-on.
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class DormantNodeManager {
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public:
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DormantNodeManager();
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~DormantNodeManager();
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// Be careful, GetAddon and PutAddon[Delayed] must be balanced.
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BMediaAddOn* GetAddOn(media_addon_id id);
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void PutAddOn(media_addon_id id);
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void PutAddOnDelayed(media_addon_id id);
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// For use by media_addon_server only
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media_addon_id RegisterAddOn(const char* path);
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void UnregisterAddOn(media_addon_id id);
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// query the server for the path
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status_t FindAddOnPath(BPath* path, media_addon_id id);
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private:
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struct loaded_add_on_info {
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BMediaAddOn* add_on;
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image_id image;
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int32 use_count;
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};
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// returns the addon or NULL if it needs to be loaded
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BMediaAddOn* _LookupAddOn(media_addon_id id);
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// manage loading and unloading add-ons from images
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status_t _LoadAddOn(const char* path, media_addon_id id,
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BMediaAddOn** _newAddOn,
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image_id* _newImage);
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void _UnloadAddOn(BMediaAddOn* addOn,
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image_id image);
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private:
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typedef std::map<media_addon_id, loaded_add_on_info> AddOnMap;
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BLocker fLock;
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AddOnMap fAddOnMap;
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};
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extern DormantNodeManager* gDormantNodeManager;
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} // namespace media
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} // namespace BPrivate
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using BPrivate::media::gDormantNodeManager;
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#endif /* _DORMANT_NODE_MANAGER_H */
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