From 0f595e076f03c02b366901e8d3c5cc0c50681108 Mon Sep 17 00:00:00 2001
From: Max Christian Pohle
Date: Tue, 23 Aug 2016 02:46:27 +0200
Subject: generic plugin manager example, fully working

---
 pluginmanager.hpp | 99 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 pluginmanager.hpp

(limited to 'pluginmanager.hpp')

diff --git a/pluginmanager.hpp b/pluginmanager.hpp
new file mode 100644
index 0000000..2415acf
--- /dev/null
+++ b/pluginmanager.hpp
@@ -0,0 +1,99 @@
+/*
+ *  pluginmanager.hpp
+ *
+ *  Copyright 2009 Max Christian Pohle <coderz@gmx.de>
+ *
+ *  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., 51 Franklin Street, Fifth Floor, Boston,
+ *  MA 02110-1301, USA.
+ */
+
+#ifndef pluginmanager
+#define pluginmanager
+  #define PLUGIN_ENGINE_VERSION 1
+
+  #include <string>
+  #include <map>
+  #include <sstream>
+  #include <dlfcn.h>
+  #include <iostream>
+  #include <list>
+
+  #include "plugins/plugin.hpp"
+
+  using namespace std;
+
+  template <class T>
+  class PluginManager
+  {
+    private:
+      int engine_version;
+      typedef T create();
+      map<string,create*> plugins;
+      typename map<string, create*>::iterator iter;
+
+    public:
+      PluginManager<T>() : engine_version(PLUGIN_ENGINE_VERSION) {}
+
+      T get_instance(string t)
+      {
+        iter = plugins.find(t);
+        if (iter != plugins.end())
+        { return iter->second(); }
+      }
+
+      list<string> list_plugins()
+      {
+        list<string> retval;
+        for(iter=plugins.begin(); iter!=plugins.end(); ++iter)
+        { retval.push_front(iter->first); }
+        return retval;
+      }
+
+      void load_plugin(string filename)
+      {
+        std::stringstream serr;
+        char* dlsym_error;
+        std::cerr << "\n> OPENING " << filename << "...";
+        void* plugin2open = dlopen(filename.c_str(), RTLD_LAZY);
+        if (dlsym_error = dlerror())
+        {
+          std::stringstream a;
+          a <<
+            std::string(filename) <<
+            std::string(" is not a valid plugin\n\t") <<
+            std::string(dlsym_error);
+          throw (char*) a.str().c_str();
+        }
+        else
+        {
+          std::cerr << "done.\n";
+        }
+
+        create* f_creator = (create*) dlsym(plugin2open, "create");
+        if (dlsym_error = dlerror())
+        {
+          throw (char*)"plugin has no creation-interface"
+            ", so is obviously no subclass of 'Plugin'";
+        }
+        else
+        {
+          std::cout << "> LOADING " << filename << "...";
+          plugins.insert(make_pair(filename, f_creator));
+          std::cout << "done.\n";
+        }
+      }
+  };
+
+#endif
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