mgl_file_mounter.h

[詳解]

// SPDX-License-Identifier: Zlib
/* ------------------------------------------------------------------------- */
/* ------------------------------------------------------------------------- */
 
#ifndef INCGUARD_MGL_FILE_MOUNTER_H_1611105265
#define INCGUARD_MGL_FILE_MOUNTER_H_1611105265
 
#include <mutex>
 
#include <mgl/common/mgl_singleton.h>
#include <mgl/file/mgl_file_delegate.h>
#include <mgl/file/mgl_file_path_view.h>
#include <mgl/stl/mgl_stl_containers.h>
#include <mgl/stl/mgl_stl_hash.h>
#include <mgl/stl/mgl_stl_memory.h>
#include <mgl/stl/mgl_stl_string.h>
 
namespace MGL::File
{
class Mounter final : public SharedSingleton<Mounter>
{
public:
    struct MountProperty
    {
        Path name;                                                
        Path path;                                                
        MountAccessType accessType{MountAccessType::ReadOnly};    
        SharedDelegate delegate{nullptr};                         
        SharedMountWork mountWork{nullptr};                       
    };
 
    using SharedMountProperty = std::shared_ptr<MountProperty>;
 
    static constexpr DelegateKey kDefaultDelegateKey = MakeDelegateKey("MGL-Default");
 
    [[nodiscard]] static STL::unique_ptr<Mounter> &GetInstanceRef() noexcept;
 
    Result Mount(const PathView &mountName, const PathView &path, MountAccessType accessType, DelegateKey delegateKey = kDefaultDelegateKey) noexcept;
    Result Unmount(const PathView &mountName) noexcept;
    [[nodiscard]] SharedMountProperty Get(const PathView &mountName) noexcept;
    [[nodiscard]] bool IsMounted(const PathView &mountName) noexcept;
 
    Result AddDelegate(DelegateKey key, const SharedDelegate &delegate) noexcept;
    Result RemoveDelegate(DelegateKey key) noexcept;
    [[nodiscard]] SharedDelegate GetDelegate(DelegateKey key = kDefaultDelegateKey) noexcept;
 
    /* ------------------------------------------------------------------------- */
    /* ------------------------------------------------------------------------- */
    void SetDefaultDelegate(DelegateKey key) noexcept
    {
        _defaultDelegateKey = key;
    }
 
private:
    STL::unordered_map<STL::string, std::shared_ptr<MountProperty>, STL::Hash::string> _mountProperties;
    std::recursive_mutex _mountMutex;
 
    STL::unordered_map<DelegateKey, SharedDelegate> _delegates;
    std::mutex _delegateMutex;
 
    DelegateKey _defaultDelegateKey{kDefaultDelegateKey};
};
}    // namespace MGL::File
#endif    // INCGUARD_MGL_FILE_MOUNTER_H_1611105265
 
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