f9ad73598b
Reduce overhead for storing the key twice, and more overhead while looking up the connection to remove it after a failure.
92 lines
2.3 KiB
C++
92 lines
2.3 KiB
C++
/*
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* Copyright (C) 2003-2014 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPD_NFS_MANAGER_HXX
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#define MPD_NFS_MANAGER_HXX
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#include "check.h"
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#include "Connection.hxx"
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#include "Compiler.h"
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#include <boost/intrusive/set.hpp>
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/**
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* A manager for NFS connections. Handles multiple connections to
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* multiple NFS servers.
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*/
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class NfsManager {
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struct LookupKey {
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const char *server;
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const char *export_name;
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};
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class ManagedConnection final
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: public NfsConnection,
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public boost::intrusive::set_base_hook<boost::intrusive::link_mode<boost::intrusive::normal_link>> {
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NfsManager &manager;
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public:
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ManagedConnection(NfsManager &_manager, EventLoop &_loop,
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const char *_server,
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const char *_export_name)
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:NfsConnection(_loop, _server, _export_name),
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manager(_manager) {}
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protected:
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/* virtual methods from NfsConnection */
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void OnNfsConnectionError(Error &&error) override;
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};
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struct Compare {
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gcc_pure
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bool operator()(const LookupKey a,
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const ManagedConnection &b) const;
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gcc_pure
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bool operator()(const ManagedConnection &a,
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const LookupKey b) const;
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};
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EventLoop &loop;
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/**
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* Maps server and export_name to #ManagedConnection.
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*/
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typedef boost::intrusive::set<ManagedConnection,
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boost::intrusive::compare<Compare>,
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boost::intrusive::constant_time_size<false>> Map;
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Map connections;
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public:
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NfsManager(EventLoop &_loop)
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:loop(_loop) {}
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/**
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* Must be run from EventLoop's thread.
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*/
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~NfsManager();
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gcc_pure
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NfsConnection &GetConnection(const char *server,
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const char *export_name);
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};
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#endif
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