100 lines
3.1 KiB
C++
100 lines
3.1 KiB
C++
/* Copyright (c) 2010 Wildfire Games
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* portable directory change notification API.
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*/
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#ifndef INCLUDED_DIR_WATCH
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#define INCLUDED_DIR_WATCH
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struct DirWatch;
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typedef shared_ptr<DirWatch> PDirWatch;
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/**
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* start watching a single directory for changes.
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*
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* @param path (must end in slash)
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* @param dirWatch opaque smart pointer to the watch state; used to
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* manage its lifetime (this is deemed more convenient than a
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* separate dir_watch_Remove interface).
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*
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* clients typically want to watch entire directory subtrees (e.g. a mod),
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* which is supported by Windows but not FAM. to reduce overhead, the
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* Windows backend always watches subtrees, but portable clients should
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* still add a watch for each subdirectory (the shared watch state is
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* reference-counted).
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* rationale: since the VFS has per-directory data structures, it is
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* convenient to store PDirWatch there instead of creating a second
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* tree structure here.
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**/
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LIB_API LibError dir_watch_Add(const fs::wpath& path, PDirWatch& dirWatch);
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class DirWatchNotification
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{
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public:
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enum EType
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{
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Created,
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Deleted,
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Changed
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};
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DirWatchNotification(const fs::wpath& pathname, EType type)
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: m_pathname(pathname), m_type(type)
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{
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}
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const fs::wpath& Pathname() const
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{
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return m_pathname;
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}
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EType Type() const
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{
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return m_type;
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}
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private:
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fs::wpath m_pathname;
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EType m_type;
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};
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typedef std::vector<DirWatchNotification> DirWatchNotifications;
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/**
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* return all pending directory watch notifications.
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*
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* @param notifications receives any pending notifications in unspecified order.
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* @return LibError (INFO::OK doesn't imply notifications were returned)
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*
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* note: the run time of this function is independent of the number of
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* directory watches and number of files.
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*
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* rationale for a polling interface: users (e.g. the main game loop)
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* typically want to receive change notifications at a single point,
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* rather than deal with the complexity of asynchronous notifications.
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**/
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LIB_API LibError dir_watch_Poll(DirWatchNotifications& notifications);
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#endif // #ifndef INCLUDED_DIR_WATCH
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