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 <map>
  22 #include <string>
  23 #include "common/ceph_mutex.h"
  24 #include "include/common_fwd.h"
  25
  26 extern "C" {
  27   const char *__ceph_plugin_version();
  28   int __ceph_plugin_init(CephContext *cct,
  29                          const std::string& type,
  30                          const std::string& name);
  31 }
  32
  33 namespace ceph {
  34
  35   class Plugin {
  36   public:
  37     void *library;
  38     CephContext *cct;
  39
  40     explicit Plugin(CephContext *cct) : library(NULL), cct(cct) {}
  41     virtual ~Plugin() {}
  42   };
  43
  44   class PluginRegistry {
  45   public:
  46     CephContext *cct;
  47     ceph::mutex lock = ceph::make_mutex("PluginRegistery::lock");
  48     bool loading;
  49     bool disable_dlclose;
  50     std::map<std::string,std::map<std::string,Plugin*> > plugins;
  51
  52     explicit PluginRegistry(CephContext *cct);
  53     ~PluginRegistry();
  54
  55     int add(const std::string& type, const std::string& name,
  56             Plugin *factory);
  57     int remove(const std::string& type, const std::string& name);
  58     Plugin *get(const std::string& type, const std::string& name);
  59     Plugin *get_with_load(const std::string& type, const std::string& name);
  60
  61     int load(const std::string& type,
  62              const std::string& name);
  63     int preload();
  64     int preload(const std::string& type);
  65   };
  66 }
  67
  68 #endif