/*

 * A registry of filesystem object providers.

 *

 * Copyright (C) 2021 Paul Boddie <paul@boddie.org.uk>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License as

 * published by the Free Software Foundation; either version 2 of

 * the License, or (at your option) any later version.

 *

 * This program 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor,

 * Boston, MA  02110-1301, USA

 */

#pragma once

#include <map>

#include <mutex>

#include <mem/types.h>

/* Forward declaration. */

class Provider;

/* Mapping type from file identifiers to providers. */

typedef std::map<fileid_t, Provider *> ProviderMapping;

typedef std::pair<fileid_t, Provider *> ProviderMappingEntry;

/* A registry of filesystem object providers. */

class ProviderRegistry

{

protected:

    ProviderMapping _providers;

    std::mutex _lock;

    /* Filesystem object access. */

    Provider *get(fileid_t fileid);

    void remove(fileid_t fileid, Provider *obj);

    void set(fileid_t fileid, Provider *obj);

public:

    /* Methods for resources. */

    void detach(fileid_t fileid, Provider *mapper);

};

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