ceph/src/erasure-code/ErasureCodePlugin.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_ERASURE_CODE_PLUGIN_H
  19 #define CEPH_ERASURE_CODE_PLUGIN_H
  20
  21 #include "common/Mutex.h"
  22 #include "ErasureCodeInterface.h"
  23
  24 extern "C" {
  25   const char *__erasure_code_version();
  26   int __erasure_code_init(char *plugin_name, char *directory);
  27 }
  28
  29 namespace ceph {
  30
  31   class ErasureCodePlugin {
  32   public:
  33     void *library;
  34
  35     ErasureCodePlugin() :
  36       library(0) {}
  37     virtual ~ErasureCodePlugin() {}
  38
  39     virtual int factory(const std::string &directory,
  40                         ErasureCodeProfile &profile,
  41                         ErasureCodeInterfaceRef *erasure_code,
  42                         std::ostream *ss) = 0;
  43   };
  44
  45   class ErasureCodePluginRegistry {
  46   public:
  47     Mutex lock;
  48     bool loading;
  49     bool disable_dlclose;
  50     std::map<std::string,ErasureCodePlugin*> plugins;
  51
  52     static ErasureCodePluginRegistry singleton;
  53
  54     ErasureCodePluginRegistry();
  55     ~ErasureCodePluginRegistry();
  56
  57     static ErasureCodePluginRegistry &instance() {
  58       return singleton;
  59     }
  60
  61     int factory(const std::string &plugin,
  62                 const std::string &directory,
  63                 ErasureCodeProfile &profile,
  64                 ErasureCodeInterfaceRef *erasure_code,
  65                 std::ostream *ss);
  66
  67     int add(const std::string &name, ErasureCodePlugin *plugin);
  68     int remove(const std::string &name);
  69     ErasureCodePlugin *get(const std::string &name);
  70
  71     int load(const std::string &plugin_name,
  72              const std::string &directory,
  73              ErasureCodePlugin **plugin,
  74              std::ostream *ss);
  75
  76     int preload(const std::string &plugins,
  77                 const std::string &directory,
  78                 std::ostream *ss);
  79   };
  80 }
  81
  82 #endif