/*

 * Filesystem provider registry.

 *

 * 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

 */

#include "provider_registry.h"

/* Methods for use with the lock already acquired. */

/* Return any registered provider for the given 'fileid' or NULL if no such

   provider is registered. */

Accountable *ProviderRegistry::get(fileid_t fileid)

{

    FileMapping::iterator entry = _providers.find(fileid);

    Accountable *provider;

    if (entry == _providers.end())

        provider = NULL;

    else

        provider = entry->second;

    return provider;

}

/* Remove a provider and its resources for the given 'fileid'. */

void ProviderRegistry::remove(fileid_t fileid, Accountable *provider)

{

    _providers.erase(fileid);

    delete provider;

}

/* Register a 'provider' for the given 'fileid'. */

void ProviderRegistry::set(fileid_t fileid, Accountable *provider)

{

    FileMapping::iterator entry = _providers.find(fileid);

    if (entry != _providers.end())

        return;

    _providers[fileid] = provider;

}

/* Detach from a provider, potentially removing it from the registry. */

void ProviderRegistry::detach(fileid_t fileid, Accountable *provider)

{

    std::lock_guard<std::mutex> guard(_lock);

    if (!provider->detach())

        remove(fileid, provider);

}

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