Port to CMake, get rid of os_int.h.

[stg.git] / stargazer / store_loader.cpp

diff --git a/stargazer/store_loader.cpp b/stargazer/store_loader.cpp
new file mode 100644 (file)
index 0000000..1529a2c
--- /dev/null
+++ b/stargazer/store_loader.cpp
@@ -0,0 +1,132 @@
+/*
+ *    This program is free software; you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation; either version 2 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program; if not, write to the Free Software
+ *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/*
+ *    Author : Maxim Mamontov <faust@stargazer.dp.ua>
+ */
+
+/*
+ $Revision: 1.6 $
+ $Date: 2010/03/04 12:24:19 $
+ $Author: faust $
+ */
+
+/*
+ *  An implementation of RAII store plugin loader
+ */
+
+#include <dlfcn.h>
+
+#include "stg/common.h"
+#include "stg/store.h"
+#include "store_loader.h"
+#include "settings_impl.h"
+
+STORE_LOADER::STORE_LOADER(const SETTINGS_IMPL & settings)
+    : isLoaded(false),
+      handle(NULL),
+      plugin(NULL),
+      errorStr(),
+      storeSettings(settings.GetStoreModuleSettings()),
+      pluginFileName(settings.GetModulesPath() + "/mod_" + storeSettings.moduleName + ".so")
+{
+}
+
+STORE_LOADER::~STORE_LOADER()
+{
+Unload();
+}
+
+bool STORE_LOADER::Load()
+{
+if (isLoaded)
+    {
+    errorStr = "Store plugin '" + pluginFileName + "' was already loaded!";
+    printfd(__FILE__, "STORE_LOADER::Load() - %s\n", errorStr.c_str());
+    return false;
+    }
+
+if (pluginFileName.empty())
+    {
+    errorStr = "Empty store plugin filename";
+    printfd(__FILE__, "STORE_LOADER::Load() - %s\n", errorStr.c_str());
+    return true;
+    }
+
+handle = dlopen(pluginFileName.c_str(), RTLD_NOW);
+
+if (!handle)
+    {
+    errorStr = "Error loading plugin '"
+        + pluginFileName + "': '" + dlerror() + "'";
+    printfd(__FILE__, "STORE_LOADER::Load() - %s\n", errorStr.c_str());
+    return true;
+    }
+
+isLoaded = true;
+
+STORE * (*GetStore)();
+GetStore = reinterpret_cast<STORE * (*)()>(dlsym(handle, "GetStore"));
+if (!GetStore)
+    {
+    errorStr = std::string("GetStore() not found! ") + dlerror();
+    printfd(__FILE__, "STORE_LOADER::Load() - %s\n", errorStr.c_str());
+    return true;
+    }
+
+plugin = GetStore();
+
+if (!plugin)
+    {
+    errorStr = "Plugin was not created!";
+    printfd(__FILE__, "STORE_LOADER::Load() - %s\n");
+    return true;
+    }
+
+plugin->SetSettings(storeSettings);
+if (plugin->ParseSettings())
+    {
+    errorStr = plugin->GetStrError();
+    printfd(__FILE__, "STORE_LOADER::Load() - Failed to parse settings. Plugin reports: '%s'\n", errorStr.c_str());
+    return true;
+    }
+
+return false;
+}
+
+bool STORE_LOADER::Unload()
+{
+printfd(__FILE__, "STORE_LOADER::Unload()\n");
+if (!isLoaded)
+    {
+    return true;
+    }
+
+delete plugin;
+
+if (dlclose(handle))
+    {
+    errorStr = "Failed to unload plugin '";
+    errorStr += pluginFileName + "': ";
+    errorStr += dlerror();
+    printfd(__FILE__, "STORE_LOADER::Unload() - %s\n", errorStr.c_str());
+    return true;
+    }
+
+isLoaded = false;
+
+return false;
+}