70 lines
1.9 KiB
C++
70 lines
1.9 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 "TMap.h"
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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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{
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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_addon_info
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{
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BMediaAddOn *addon;
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image_id image;
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int32 usecount;
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};
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// returns the addon or NULL if it needs to be loaded
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BMediaAddOn *TryGetAddon(media_addon_id id);
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// manage loading and unloading add-ons from images
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status_t LoadAddon(BMediaAddOn **newaddon, image_id *newimage, const char *path, media_addon_id id);
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void UnloadAddon(BMediaAddOn *addon, image_id image);
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private:
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Map<media_addon_id,loaded_addon_info> *fAddonmap;
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BLocker *fLock;
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};
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}; // namespace media
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}; // namespace BPrivate
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extern BPrivate::media::DormantNodeManager *_DormantNodeManager;
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#endif /* _DORMANT_NODE_MANAGER_H */
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