nextcloud-desktop/shell_integration/windows/OCUtil/RemotePathChecker.h
Jocelyn Turcotte 47fbfbc006 shell/Windows: Avoid memory allocations and copies when querying icons
IsMemberOf is called for every file (in the ownCloud directory or not) and
with every instance of OCOverlay (we have 5) when displaying a list of
files in Explorer.

Refactor the code to avoid copying the list of watched directories, as
well as creating a wstring from a PWWSTR for files outside watched
directories.

Also change some calls of begin_with to use isDescendantOf since it
properly handles parent paths not ending with a backslash, which could
lead to SocketAPI queries for sibling folders with a name that starts with
a watched folder name.
2017-01-18 12:15:52 +01:00

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/**
* Copyright (c) 2014 ownCloud GmbH. All rights reserved.
*
* This library is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; version 2.1 of the License
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*/
#ifndef PATHCHECKER_H
#define PATHCHECKER_H
#include <string>
#include <vector>
#include <unordered_map>
#include <queue>
#include <thread>
#include <memory>
#include <mutex>
#include <atomic>
#include <condition_variable>
#pragma once
class __declspec(dllexport) RemotePathChecker {
public:
enum FileState {
// Order synced with OCOverlay
StateError = 0,
StateOk, StateOkSWM,
StateSync,
StateWarning,
StateNone
};
RemotePathChecker();
~RemotePathChecker();
std::shared_ptr<const std::vector<std::wstring>> WatchedDirectories() const;
bool IsMonitoredPath(const wchar_t* filePath, int* state);
private:
FileState _StrToFileState(const std::wstring &str);
std::mutex _mutex;
std::atomic<bool> _stop;
// Everything here is protected by the _mutex
/** The list of paths we need to query. The main thread fill this, and the worker thread
* send that to the socket. */
std::queue<std::wstring> _pending;
std::unordered_map<std::wstring, FileState> _cache;
// The vector is const since it will be accessed from multiple threads through OCOverlay::IsMemberOf.
// Each modification needs to be made onto a copy and then atomically replaced in the shared_ptr.
std::shared_ptr<const std::vector<std::wstring>> _watchedDirectories;
bool _connected;
// The main thread notifies when there are new items in _pending
//std::condition_variable _newQueries;
HANDLE _newQueries;
std::thread _thread;
void workerThreadLoop();
};
#endif