added: plugin mechanism

files: core/plugin.h core/plugin.cpp core/pluginmsg.h
added: directory 'main' with main.cpp (moved from 'core' directory)
changed: the way of building
       nearly everything is in cmslu.so
       only main() is in cmslu and is dynamically linked with cmslu.so



git-svn-id: svn://ttmath.org/publicrep/cmslu/trunk@516 e52654a7-88a9-db11-a3e9-0013d4bc506e

core/plugin.cpp

@@ -0,0 +1,127 @@
+/*
+ * This file is a part of CMSLU -- Content Management System like Unix
+ * and is not publicly distributed
+ * 
+ * Copyright (c) 2008-2009, Tomasz Sowa
+ * All rights reserved.
+ * 
+ */
+ 
+#include <dlfcn.h>
+#include "plugin.h"
+#include "pluginmsg.h"
+
+
+
+
+void Plugin::UnloadPlugins()
+{
+size_t i;
+	
+	slots.clear();
+
+	for(i=0 ; i<plugins.size() ; ++i)
+		dlclose(plugins[i]);
+	
+	plugins.clear();
+}
+
+
+Plugin::Plugin()
+{
+}
+	
+
+Plugin::~Plugin()
+{
+	UnloadPlugins();	
+}
+
+
+void Plugin::LoadPlugins(const std::vector<std::string> & plugins)
+{
+size_t i;
+
+	for(i=0 ; i<plugins.size() ; ++i)
+	{
+		LoadPlugin(plugins[i]);
+	}
+}
+
+
+void Plugin::LoadPlugin(const std::string & filename)
+{
+	LoadPlugin(filename.c_str());
+}
+
+
+void Plugin::LoadPlugin(const char * filename)
+{
+	void * p = dlopen(filename, RTLD_NOW | RTLD_LOCAL);
+
+	if( !p )
+	{
+		log << log1 << "Pl: cannot load a plugin: " << filename << logend;
+		
+		/*
+		const char * t = dlerror();
+		if( t )
+			log << log1 << t << logend;
+		*/
+		
+		return;
+	}
+	
+	Fun fun = (Fun)dlfunc(p, "Init");
+	
+	if( !fun )
+	{
+		log << log1 << "Pl: cannot load a plugin: " << filename << " (there is no Init() function)" << logend;
+		dlclose(p);
+		return;
+	}
+	
+	arg.Clear();
+	
+	if( fun(&arg) )
+	{
+		log << log1 << "Pl: plugin loaded: " << filename << logend;
+		plugins.push_back(p);
+	}
+	else
+	{
+		log << log1 << "Pl: plugin Init() returned false (" << filename << ") " << logend;
+		dlclose(p);
+	}
+}
+
+
+
+
+Arg * Plugin::Call(int message, void * a, void * a2, void * a3)
+{
+	Slots::iterator i = slots.lower_bound(message);
+	arg.Clear();
+	arg.app  = a;
+	arg.app2 = a2;
+	arg.app3 = a3;
+	
+	for( ; i!=slots.end() && i->first==message ; ++i )
+	{
+		if( i->second(&arg) )
+			arg.ret_true++;
+		else
+			arg.ret_false++;
+	}
+	
+return &arg;
+}
+
+
+
+
+
+void Plugin::Assign(int message, Fun fun)
+{
+	slots.insert( std::make_pair(message, fun) );
+}