ceph/src/common/PluginRegistry.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph distributed storage system
   5  *
   6  * Copyright (C) 2013,2014 Cloudwatt <libre.licensing@cloudwatt.com>
   7  * Copyright (C) 2014 Red Hat <contact@redhat.com>
   8  *
   9  * Author: Loic Dachary <loic@dachary.org>
  10  *
  11  *  This library is free software; you can redistribute it and/or
  12  *  modify it under the terms of the GNU Lesser General Public
  13  *  License as published by the Free Software Foundation; either
  14  *  version 2.1 of the License, or (at your option) any later version.
  15  *
  16  */
  17
  18 #ifndef CEPH_COMMON_PLUGINREGISTRY_H
  19 #define CEPH_COMMON_PLUGINREGISTRY_H
  20
  21 #include "common/Mutex.h"
  22
  23 class CephContext;
  24
  25 extern "C" {
  26   const char *__ceph_plugin_version();
  27   int __ceph_plugin_init(CephContext *cct,
  28                          const std::string& type,
  29                          const std::string& name);
  30 }
  31
  32 namespace ceph {
  33
  34   class Plugin {
  35   public:
  36     void *library;
  37     CephContext *cct;
  38
  39     explicit Plugin(CephContext *cct) : library(NULL), cct(cct) {}
  40     virtual ~Plugin() {}
  41   };
  42
  43   class PluginRegistry {
  44   public:
  45     CephContext *cct;
  46     Mutex lock;
  47     bool loading;
  48     bool disable_dlclose;
  49     std::map<std::string,std::map<std::string,Plugin*> > plugins;
  50
  51     explicit PluginRegistry(CephContext *cct);
  52     ~PluginRegistry();
  53
  54     int add(const std::string& type, const std::string& name,
  55             Plugin *factory);
  56     int remove(const std::string& type, const std::string& name);
  57     Plugin *get(const std::string& type, const std::string& name);
  58     Plugin *get_with_load(const std::string& type, const std::string& name);
  59
  60     int load(const std::string& type,
  61              const std::string& name);
  62     int preload();
  63     int preload(const std::string& type);
  64   };
  65 }
  66
  67 #endif