granicus.if.org Git - icinga2/blob - lib/base/component.cpp

   1 /******************************************************************************
   2  * Icinga 2                                                                   *
   3  * Copyright (C) 2012 Icinga Development Team (http://www.icinga.org/)        *
   4  *                                                                            *
   5  * This program is free software; you can redistribute it and/or              *
   6  * modify it under the terms of the GNU General Public License                *
   7  * as published by the Free Software Foundation; either version 2             *
   8  * of the License, or (at your option) any later version.                     *
   9  *                                                                            *
  10  * This program is distributed in the hope that it will be useful,            *
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of             *
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              *
  13  * GNU General Public License for more details.                               *
  14  *                                                                            *
  15  * You should have received a copy of the GNU General Public License          *
  16  * along with this program; if not, write to the Free Software Foundation     *
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.             *
  18  ******************************************************************************/
  19
  20 #include "i2-base.h"
  21
  22 using namespace icinga;
  23
  24 REGISTER_TYPE(Component, NULL);
  25
  26 /**
  27  * Constructor for the component class.
  28  */
  29 Component::Component(const Dictionary::Ptr& properties)
  30         : DynamicObject(properties)
  31 {
  32         assert(Application::IsMainThread());
  33
  34         if (!IsLocal())
  35                 throw_exception(runtime_error("Component objects must be local."));
  36
  37 #ifdef _WIN32
  38         HMODULE
  39 #else /* _WIN32 */
  40         lt_dlhandle
  41 #endif /* _WIN32 */
  42         hModule;
  43
  44         Logger::Write(LogInformation, "base", "Loading component '" + GetName() + "'");
  45
  46         hModule = Utility::LoadIcingaLibrary(GetName(), true);
  47
  48         CreateComponentFunction pCreateComponent;
  49
  50 #ifdef _WIN32
  51         pCreateComponent = reinterpret_cast<CreateComponentFunction>(GetProcAddress(hModule,
  52             "CreateComponent"));
  53 #else /* _WIN32 */
  54 #       ifdef __GNUC__
  55         /* suppress compiler warning for void * cast */
  56         __extension__
  57 #       endif
  58         pCreateComponent = reinterpret_cast<CreateComponentFunction>(lt_dlsym(hModule,
  59             "CreateComponent"));
  60 #endif /* _WIN32 */
  61
  62         IComponent::Ptr impl;
  63
  64         try {
  65                 if (pCreateComponent == NULL)
  66                         throw_exception(runtime_error("Loadable module does not contain "
  67                             "CreateComponent function"));
  68
  69                 /* pCreateComponent returns a raw pointer which we must wrap in a shared_ptr */
  70                 impl = IComponent::Ptr(pCreateComponent());
  71
  72                 if (!impl)
  73                         throw_exception(runtime_error("CreateComponent function returned NULL."));
  74         } catch (...) {
  75 #ifdef _WIN32
  76                 FreeLibrary(hModule);
  77 #else /* _WIN32 */
  78                 lt_dlclose(hModule);
  79 #endif /* _WIN32 */
  80                 throw;
  81         }
  82
  83         m_Impl = impl;
  84 }
  85
  86 /**
  87  * Destructor for the Component class.
  88  */
  89 Component::~Component(void)
  90 {
  91         if (m_Impl)
  92                 m_Impl->Stop();
  93 }
  94
  95 /**
  96  * Starts the component. Called when the DynamicObject is fully
  97  * constructed/registered.
  98  */
  99 void Component::Start(void)
 100 {
 101         m_Impl->m_Config = GetSelf();
 102         m_Impl->Start();
 103 }
 104
 105 /**
 106  * Adds a directory to the component search path.
 107  *
 108  * @param componentDirectory The directory.
 109  */
 110 void Component::AddSearchDir(const String& componentDirectory)
 111 {
 112         Logger::Write(LogInformation, "base", "Adding library search dir: " +
 113             componentDirectory);
 114
 115 #ifdef _WIN32
 116         SetDllDirectory(componentDirectory.CStr());
 117 #else /* _WIN32 */
 118         lt_dladdsearchdir(componentDirectory.CStr());
 119 #endif /* _WIN32 */
 120 }
 121
 122 /**
 123  * Retrieves the configuration for this component.
 124  *
 125  * @returns The configuration.
 126  */
 127 DynamicObject::Ptr IComponent::GetConfig(void) const
 128 {
 129         return m_Config.lock();
 130 }
 131
 132 /**
 133  * Starts the component.
 134  */
 135 void IComponent::Start(void)
 136 {
 137         /* Nothing to do in the default implementation. */
 138 }
 139
 140 /**
 141  * Stops the component.
 142  */
 143 void IComponent::Stop(void)
 144 {
 145         /* Nothing to do in the default implementation. */
 146 }