FileNotifier.h

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// Copyright 2024 libsese
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
 
#pragma once
 
#include "sese/Config.h"
#include "sese/util/ErrorCode.h"
#include "sese/util/Result.h"
 
#include <atomic>
#ifdef __APPLE__
#include <tuple>
#else
#include "sese/thread/Thread.h"
#endif
 
namespace sese::system {
 
struct FileNotifyOption {
    virtual ~FileNotifyOption() = default;
 
    virtual void onCreate(std::string_view name) = 0;
 
    virtual void onMove(std::string_view src_name, std::string_view dst_name) = 0;
 
    virtual void onModify(std::string_view name) = 0;
 
    virtual void onDelete(std::string_view name) = 0;
};
 
class FileNotifier {
public:
    using Ptr = std::unique_ptr<FileNotifier>;
 
    static FileNotifier::Ptr create(const std::string &path, FileNotifyOption *option) noexcept;
 
    static Result<Ptr, ErrorCode> createEx(const std::string &path, FileNotifyOption *option) noexcept;
 
    virtual ~FileNotifier() noexcept;
 
    void loopNonblocking() noexcept;
 
    void shutdown() noexcept;
 
private:
    FileNotifier() = default;
 
#ifdef WIN32
    void *file_handle = nullptr;
    void *overlapped = nullptr;
    std::atomic_bool is_shutdown = false;
    FileNotifyOption *option = nullptr;
    Thread::Ptr th = nullptr;
#elif __linux__
    int inotify_fd = -1;
    int watch_fd = -1;
    std::atomic_bool is_shutdown = false;
    FileNotifyOption *option = nullptr;
    Thread::Ptr th = nullptr;
#elif __APPLE__
    void *stream = nullptr;
    void *queue = nullptr;
#endif
};
} // namespace sese::system