Add a library manager + exception handling;

Remove namespace

src/plug-in/Makefile.am

@@ -5,5 +5,6 @@ noinst_LTLIBRARIES = libplugin.la
 SUBDIRS=test
 
 libplugin_la_SOURCES = \
-		pluginmanager.cpp
+		pluginmanager.cpp \
+		librarymanager.cpp
 

src/plug-in/librarymanager.cpp

+#include "librarymanager.h"
+    
+    LibraryManager::LibraryManager (const std::string &filename)
+    : _filename(filename), _handlePtr(NULL)
+{
+    _handlePtr = loadLibrary (filename);
+}
+
+LibraryManager::~LibraryManager (void)
+{
+    unloadLibrary ();
+}
+
+LibraryManager::LibraryHandle LibraryManager::loadLibrary (const std::string &filename)
+{
+    LibraryHandle pluginHandlePtr = NULL;
+    const char *error;
+
+    _debug("Loading dynamic library %s\n", filename.c_str());
+
+    /* Load the library */
+    pluginHandlePtr = dlopen( filename.c_str(), RTLD_LAZY );
+    if( !pluginHandlePtr ) {
+        error = dlerror();
+        _debug("Error while opening plug-in: %s\n", error);
+        return NULL;
+    }
+    dlerror();
+    return pluginHandlePtr;
+}
+
+int LibraryManager::unloadLibrary ()
+{
+    if (_handlePtr == NULL)
+        return 1;
+
+    _debug("Unloading dynamic library ...\n");
+    dlclose( _handlePtr );
+    if (dlerror())
+    {
+        _debug("Error unloading the library : %s\n...", dlerror());
+        return 1;
+    }
+    return 0;
+}
+
+int LibraryManager::resolveSymbol (const std::string &symbol, SymbolHandle *symbolPtr)
+{
+    SymbolHandle sy = 0;
+
+    if (_handlePtr){
+        try {
+            sy = dlsym(_handlePtr, symbol.c_str());
+            if(sy != NULL) {
+                *symbolPtr = sy;
+                return 0;
+            }
+        }
+        catch (...) {}
+        
+        throw LibraryManagerException ( _filename, symbol, LibraryManagerException::symbolNotFound);
+    }
+    else
+        return 1;
+}
+
+
+/************************************************************************************************/
+
+LibraryManagerException::LibraryManagerException (const std::string &libraryName, const std::string &details, Reason reason) :
+    _reason (reason), _details (""), std::runtime_error ("")
+    
+{
+    if (_reason == loadingFailed)
+        _details = "Error when loading " + libraryName + "\n" + details;
+    else
+        _details = "Error when resolving symbol " + details + " in " + libraryName;
+}
+
+const char* LibraryManagerException::what () const throw()
+{
+    return _details.c_str();
+}

src/plug-in/librarymanager.h

+#ifndef LIBRARY_MANAGER_H
+#define LIBRARY_MANAGER_H
+
+#include "dlfcn.h"
+#include <stdexcept> 
+
+#include "global.h"
+
+class LibraryManager {
+
+    public:
+        typedef void* LibraryHandle;
+        typedef void* SymbolHandle;
+
+        LibraryManager (const std::string &filename);
+        ~LibraryManager (void);
+
+        int resolveSymbol (const std::string &symbol, SymbolHandle *ptr);
+
+        int unloadLibrary (void);
+
+    protected:
+        LibraryHandle loadLibrary (const std::string &filename);
+
+    private:
+        std::string _filename;
+        LibraryHandle _handlePtr;
+};
+
+class LibraryManagerException : public std::runtime_error {
+
+    public:
+
+        typedef enum Reason {
+            loadingFailed = 0,
+            symbolNotFound
+        }Reason;
+
+        LibraryManagerException (const std::string &libraryName, const std::string &details, Reason reason);
+        ~LibraryManagerException (void) throw() {}
+
+        inline Reason getReason (void) { return _reason; } 
+
+        const char* what () const throw();
+
+    private:
+        Reason _reason;
+        std::string _details;
+};
+
+#endif // LIBRARY_MANAGER_H

src/plug-in/plugin.h

@@ -4,40 +4,39 @@
 #include <string> 
 #include "global.h" 
 
+#include "pluginmanager.h" 
+
 /*
  * @file plugin.h
  * @brief Define a plugin object 
  */
 
-namespace sflphone {
+class Plugin {
 
-    class Plugin {
+    public:
+        Plugin( const std::string &name ){
+            _name = name;
+        }
 
-        public:
-            Plugin( const std::string &name ){
-                _name = name;
-            }
+        virtual ~Plugin()  {}
 
-            virtual ~Plugin()  {}
+        inline std::string getPluginName (void) { return _name; }
 
-            inline std::string getPluginName (void) { return _name; }
+        /**
+         * Return the minimal core version required so that the plugin could work
+         * @return int  The version required
+         */
+        virtual int initFunc (PluginInfo **info) = 0;
 
-            /**
-             * Return the minimal core version required so that the plugin could work
-             * @return int  The version required
-             */
-            virtual int initFunc (int i)  = 0;
-        
-        private:
-            Plugin &operator =(const Plugin &plugin);
+    private:
+        Plugin &operator =(const Plugin &plugin);
 
-            std::string _name;
-    };
+        std::string _name;
+};
 
-}
-typedef ::sflphone::Plugin* createFunc (void);
+typedef Plugin* createFunc (void);
 
-typedef void destroyFunc (::sflphone::Plugin*);
+typedef void destroyFunc (Plugin*);
 
 #endif //PLUGIN_H
 

src/plug-in/pluginmanager.cpp

@@ -3,10 +3,10 @@
 
 #include "pluginmanager.h"
 
-::sflphone::PluginManager* ::sflphone::PluginManager::_instance = 0;
+PluginManager* PluginManager::_instance = 0;
 
-    ::sflphone::PluginManager* 
-::sflphone::PluginManager::instance()
+    PluginManager* 
+PluginManager::instance()
 {
     if(!_instance){
         return new PluginManager();
@@ -14,28 +14,26 @@
     return _instance;
 }
 
-::sflphone::PluginManager::PluginManager()
-    :_loadedPlugins()
+    PluginManager::PluginManager()
+:_loadedPlugins()
 {
     _instance = this;
 }
 
-::sflphone::PluginManager::~PluginManager()
+PluginManager::~PluginManager()
 {
     _instance = 0;
 }
 
     int 
-::sflphone::PluginManager::loadPlugins (const std::string &path)
+PluginManager::loadPlugins (const std::string &path)
 {
     std::string pluginDir, current;
-    ::sflphone::Plugin *plugin;
     DIR *dir;
     dirent *dirStruct;
-    int result=0;
-    void *handle;
-    createFunc* createPlugin;
-    
+    LibraryManager *library;
+    Plugin *plugin;
+
     const std::string pDir = "..";
     const std::string cDir = ".";
 
@@ -52,22 +50,25 @@
             current = dirStruct->d_name;
             /* Test if the current item is not the parent or the current directory */
             if( current != pDir && current != cDir ){
-                handle = loadDynamicLibrary( pluginDir + current );
-                
-                if(instanciatePlugin (handle, &plugin) != 0)       	        
+
+                /* Load the dynamic library */
+                library = loadDynamicLibrary( pluginDir + current );
+
+                /* Instanciate the plugin object */
+                if(instanciatePlugin (library, &plugin) != 0)       	        
                 {
                     _debug("Error instanciating the plugin ...\n");
                     return 1;
                 }
-                
-                /*
-                if(registerPlugin (handle, interface) != 0)
+
+                /* Regitering the current plugin */
+                if(registerPlugin (plugin, library) != 0)
                 {
                     _debug("Error registering the plugin ...\n");
                     return 1;
-                }*/
+                }
             }
-	    }
+        }
     }
     else
         return 1;
@@ -78,84 +79,134 @@
     return 0;
 }
 
-    ::sflphone::Plugin* 
-::sflphone::PluginManager::isPluginLoaded (const std::string &name)
+int 
+PluginManager::unloadPlugins (void)
 {
-    if(_loadedPlugins.empty())    return NULL;  
+    PluginInfo *info;
+
+    if(_loadedPlugins.empty())    return 0;  
 
     /* Use an iterator on the loaded plugins map */
     pluginMap::iterator iter;
 
     iter = _loadedPlugins.begin();
     while( iter != _loadedPlugins.end() ) {
-        if ( iter->first == name ) {
-            /* Return the associated plugin */
-            return iter->second;
+        info = iter->second;
+        
+        if (deletePlugin (info) != 0)
+        {
+            _debug("Error deleting the plugin ... \n");
+            return 1;
         }
+        
+        unloadDynamicLibrary (info->_libraryPtr);
+        
+        if (unregisterPlugin (info) != 0)
+        {
+            _debug("Error unregistering the plugin ... \n");
+            return 1;
+        }
+
         iter++;
     }
-
-    /* If we are here, it means that the plugin we were looking for has not been loaded */
-    return NULL;
+    return 0;
 }
 
-
-    void* 
-::sflphone::PluginManager::loadDynamicLibrary (const std::string& filename) 
+    bool 
+PluginManager::isPluginLoaded (const std::string &name)
 {
+    if(_loadedPlugins.empty())    return false;  
+
+    /* Use an iterator on the loaded plugins map */
+    pluginMap::iterator iter;
+    iter = _loadedPlugins.find (name);
 
-    void *pluginHandlePtr = NULL;
-    const char *error;
+    /* Returns map::end if the specified key has not been found */
+    if(iter==_loadedPlugins.end())
+        return false;
 
-    _debug("Loading dynamic library %s\n", filename.c_str());
+    /* Returns the plugin pointer */
+    return true;
+}
 
-    /* Load the library */
-    pluginHandlePtr = dlopen( filename.c_str(), RTLD_LAZY );
-    if( !pluginHandlePtr ) {
-        error = dlerror();
-        _debug("Error while opening plug-in: %s\n", error);
-        return NULL;
-    }
-    dlerror();
-    return pluginHandlePtr;
 
+   LibraryManager* 
+PluginManager::loadDynamicLibrary (const std::string& filename) 
+{
+    /* Load the library through the library manager */
+    return new LibraryManager (filename);
+}
+
+    int 
+PluginManager::unloadDynamicLibrary (LibraryManager *libraryPtr) 
+{
+    _debug("Unloading dynamic library ...\n");
+    /* Close it */
+    return libraryPtr->unloadLibrary ();
 }
 
     int 
-::sflphone::PluginManager::instanciatePlugin (void *handlePtr, ::sflphone::Plugin **plugin)
+PluginManager::instanciatePlugin (LibraryManager *libraryPtr, Plugin **plugin)
 {
     createFunc *createPlugin;
+    LibraryManager::SymbolHandle symbol;
 
-    createPlugin = (createFunc*)dlsym(handlePtr, "create");
-    if( dlerror() )
-    {
-        _debug("Error creating the plugin: %s\n", dlerror());
+    if (libraryPtr->resolveSymbol ("createPlugin", &symbol) != 0)
         return 1;
-    }
+    createPlugin = (createFunc*)symbol;
     *plugin = createPlugin();
     return 0;
 }
 
     int 
-::sflphone::PluginManager::registerPlugin (void *handlePtr, Plugin *plugin)
+PluginManager::deletePlugin (PluginInfo *plugin)
 {
-    std::string name;
+    destroyFunc *destroyPlugin;
+    LibraryManager::SymbolHandle symbol;
 
-    if( !(handlePtr && plugin!=0) )
+    if (plugin->_libraryPtr->resolveSymbol ("destroyPlugin", &symbol) != 0)
         return 1;
-    
-    name = plugin->getPluginName();
-    /* Add the data in the loaded plugin map */
-    _loadedPlugins[ name ] = plugin;
+    destroyPlugin = (destroyFunc*)symbol;
+    /* Call it */
+    destroyPlugin (plugin->_plugin);
     return 0;
 }
 
     int 
-::sflphone::PluginManager::unloadDynamicLibrary (void * pluginHandlePtr) 
+PluginManager::registerPlugin (Plugin *plugin, LibraryManager *library)
 {
-    dlclose( pluginHandlePtr );
-    dlerror();
+    std::string key;
+    PluginInfo *p_info;
+
+    if( plugin==0 )
+        return 1;
+    
+    p_info = new PluginInfo();
+    /* Retrieve information from the plugin */
+    plugin->initFunc (&p_info);
+    key = p_info->_name;
+
+    //p_info->_plugin = plugin;
+    p_info->_libraryPtr = library;
+
+    /* Add the data in the loaded plugin map */
+    _loadedPlugins[ key ] = p_info;
     return 0;
 }
 
+int 
+PluginManager::unregisterPlugin (PluginInfo *plugin)
+{
+    pluginMap::iterator iter;
+    std::string key;
+
+    key = plugin->_name;
 
+    if (!isPluginLoaded(key))
+        return 1;
+
+    iter = _loadedPlugins.find (key);
+    _loadedPlugins.erase (iter);
+
+    return 0;
+}

src/plug-in/pluginmanager.h

@@ -6,19 +6,27 @@
  * @brief   Base class of the plugin manager
  */
 
-#include "plugin.h"
+#include "librarymanager.h"
 #include "global.h"
 
 #include <map> 
 #include <string> 
+#include <vector> 
 
-namespace sflphone {
-
-    class PluginManager {
+class Plugin;
 
+typedef struct PluginInfo {
+    std::string _name;
+    LibraryManager *_libraryPtr;
+    Plugin *_plugin;
+    int _major_version;
+    int _minor_version;
+} PluginInfo;
 
-        public:
+#include "plugin.h"
 
+class PluginManager {
+    public:
         /**
          * Destructor
          */
@@ -34,46 +42,51 @@ namespace sflphone {
          * @param path  The absolute path to the directory
          * @return int  The number of items loaded
          */
-        int loadPlugins( const std::string &path = "" );
+        int loadPlugins (const std::string &path = "");
 
-        int instanciatePlugin( void *handlePtr, Plugin** plugin );
+        int unloadPlugins (void);
+
+        int instanciatePlugin (LibraryManager* libraryPtr, Plugin** plugin);
 
         /**
          * Check if a plugin has been already loaded
          * @param name  The name of the plugin looked for
-         * @return Plugin*  The pointer on the plugin or NULL if not found
+         * @return bool  The pointer on the plugin or NULL if not found
          */
-        Plugin* isPluginLoaded( const std::string &name );
+        bool isPluginLoaded (const std::string &name);
 
-        int registerPlugin (void *handle, Plugin *plugin);
+        int registerPlugin (Plugin *plugin, LibraryManager *library);
         
+        int unregisterPlugin (PluginInfo *plugin);
+
+        int deletePlugin (PluginInfo *plugin); 
+
         /**
          * Load a unix dynamic/shared library 
          * @param filename  The path to the dynamic/shared library
-         * @return void*    A pointer on it
+         * @return LibraryManager*    A pointer on the library
          */
-        void * loadDynamicLibrary( const std::string &filename );
-        
+        LibraryManager* loadDynamicLibrary (const std::string &filename);
+
         /**
          * Unload a unix dynamic/shared library 
-         * @param pluginHandleptr  The pointer on the loaded plugin
+         * @param LibraryManager*  The pointer on the loaded library
          */
-        int unloadDynamicLibrary( void * pluginHandlePtr );
-
+        int unloadDynamicLibrary (LibraryManager* libraryPtr);
 
-        private:
+    private:
         /**
          * Default constructor
          */
         PluginManager();
-        
+
         /* Map of plugins associated by their string name */
-        typedef std::map<std::string, Plugin*> pluginMap;
+        typedef std::map<std::string, PluginInfo*> pluginMap;
         pluginMap _loadedPlugins;
 
         /* The unique static instance */
         static PluginManager* _instance;
-    };
-}
+
+};
 
 #endif //PLUGIN_MANAGER_H

src/plug-in/test/pluginTest.cpp

 #include "../plugin.h" 
 
-namespace sflphone {
-
-    class PluginTest : public Plugin {
-    
-        public:
-            PluginTest( const std::string &name )
-                :Plugin( name ) {
-                }
-
-            virtual int initFunc (int i)
-            {
-                return i;
+#define MAJOR_VERSION   1
+#define MINOR_VERSION   0
+
+class PluginTest : public Plugin {
+
+    public:
+        PluginTest( const std::string &name )
+            :Plugin( name ) {
             }
 
-    };
-}
+        virtual int initFunc (PluginInfo **info) {
+
+            (*info)->_plugin = this;
+            (*info)->_major_version = MAJOR_VERSION;
+            (*info)->_minor_version = MINOR_VERSION;
+            (*info)->_name = getPluginName();
+
+            return 0;
+        }
+};
 
-extern "C" ::sflphone::Plugin* create (void){
-    return new ::sflphone::PluginTest("mytest");
+extern "C" Plugin* createPlugin (void){
+    return new PluginTest("mytest");
 }
 
-extern "C" void destroy (::sflphone::Plugin *p){
+extern "C" void destroyPlugin (Plugin *p){
     delete p;
 }

test/pluginmanagerTest.cpp

@@ -26,60 +26,70 @@
 using std::cout;
 using std::endl;
 
-#define PLUGIN_TEST_DIR  "/usr/lib/sflphone/plugins/libplugintest.so"
-#define PLUGIN_TEST_NAME  "mytest"
+#define PLUGIN_TEST_DIR  "/usr/lib/sflphone/plugins/"