Loadable filter support for FilterFactory using dlopen/dlsym. Only

[metaproxy-moved-to-github.git] / src / filter_factory.cpp

diff --git a/src/filter_factory.cpp b/src/filter_factory.cpp
index 6cbca63..a5406bd 100644 (file)
--- a/src/filter_factory.cpp
+++ b/src/filter_factory.cpp
@@ -1,11 +1,16 @@
-/* $Id: filter_factory.cpp,v 1.1 2005-11-10 23:10:42 adam Exp $
+/* $Id: filter_factory.cpp,v 1.2 2005-12-10 09:59:10 adam Exp $
    Copyright (c) 2005, Index Data.
 
 %LICENSE%
  */
 
+#include "config.hpp"
+
 #include "filter_factory.hpp"
 
+#if HAVE_DLFCN_H
+#include <dlfcn.h>
+#endif
 #include <stdexcept>
 #include <iostream>
 #include <string>
@@ -13,6 +18,7 @@
 
 namespace yp2 {
     class FilterFactory::Rep {
+        typedef std::map<std::string, CreateFilterCallback> CallbackMap;
     public:
         friend class FilterFactory;
         CallbackMap m_fcm;
@@ -47,7 +53,7 @@ yp2::FilterFactory::~FilterFactory()
 bool yp2::FilterFactory::add_creator(std::string fi,
                                      CreateFilterCallback cfc)
 {
-    return m_p->m_fcm.insert(CallbackMap::value_type(fi, cfc)).second;
+    return m_p->m_fcm.insert(Rep::CallbackMap::value_type(fi, cfc)).second;
 }
 
 
@@ -58,7 +64,7 @@ bool yp2::FilterFactory::drop_creator(std::string fi)
 
 yp2::filter::Base* yp2::FilterFactory::create(std::string fi)
 {
-    CallbackMap::const_iterator it = m_p->m_fcm.find(fi);
+    Rep::CallbackMap::const_iterator it = m_p->m_fcm.find(fi);
     
     if (it == m_p->m_fcm.end()){
         std::string msg = "filter type '" + fi + "' not found";
@@ -68,6 +74,33 @@ yp2::filter::Base* yp2::FilterFactory::create(std::string fi)
     return (it->second());
 }
 
+#if HAVE_DLFCN_H
+bool yp2::FilterFactory::add_creator_dyn(const std::string &fi,
+                                         const std::string &path)
+{
+    std::string full_path = path + "/yp2_filter_" + fi + ".so";
+    void *dl_handle = dlopen(full_path.c_str(), RTLD_GLOBAL|RTLD_NOW);
+    if (!dl_handle)
+    {
+        const char *dl = dlerror();
+        std::cout << "dlopen " << full_path << " failed. dlerror=" << dl << 
+            std::endl;
+        return false;
+    }
+
+    std::string full_name = "yp2_filter_" + fi;
+    
+    void *dlsym_ptr = dlsym(dl_handle, full_name.c_str());
+    if (!dlsym_ptr)
+    {
+        std::cout << "dlsym " << full_name << " failed\n";
+        return false;
+    }
+    struct yp2_filter_struct *s = (struct yp2_filter_struct *) dlsym_ptr;
+    return add_creator(fi, s->creator);
+}
+#endif
+
 /*
  * Local variables:
  * c-basic-offset: 4