- Add preliminary code for Python policy management

git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@370 3ecf2c5c-341e-0410-92b4-d18e462d057c

src/backend/pyloader/python_policy_manager.cc

@@ -20,9 +20,11 @@
 
 #include "python_policy_manager.hh"
 
+#include <string>
+#include <cassert>
+#include <cstdio>
 using namespace sgpem;
 
-
 //static object
 PythonPolicyManager* PythonPolicyManager::_instance = NULL;
 
@@ -64,7 +66,78 @@ PythonPolicyManager::init()
   PyRun_SimpleString("import sys\n"
 		     "sys.path[:0] = [ '" MODDIR "', '" PYCDIR "' ]\n");
 
+  // Okay, here we go.
+  // Black magic at work. 
+
+  // FIXME : Hardcoded policy
+  char* policy_name = "fcfs_policy";
+  PyObject* pLoadmeStr = PyString_FromString(policy_name);
+  PyObject *pModule = PyImport_Import(pLoadmeStr);
+  Py_DECREF(pLoadmeStr);
+  
+  if( !pModule ) 
+  {
+    PyErr_Print(); // Error in import
+    // FIXME : don't exit abruptly, but fall back gracefully
+    exit(-1);
   }
 
+  // Dictionary with defined ``symbols'' for .pyc file
+  PyObject* pDict = PyModule_GetDict(pModule);
+  assert(pDict);
+
+  // Build up UserPythonScriptAdapter
+  {
+    std::string py_adapter = std::string("class UserPythonScriptAdapter(") + 
+                             policy_name + "):\n"
+      "   def __init__(self):\n"
+      "      pass;\n"
+      "   def async_configure():\n"
+      "      pass;\n"
+      "   def async_sort_queue():\n"
+      "      pass;\n"
+      "   def async_is_preemptible():\n"
+      "      pass;\n"
+      "   def async_is_timesliced():\n"
+      "      pass;\n"
+      "\n";
+    PyRun_SimpleString(py_adapter.c_str());
+  }
+
+  //build SWIG proxy object inside the interpreter
+  PyRun_SimpleString("py_ad = UserPythonScriptAdapter");
+  /*  const char *buildPyProcess = 
+	  "import proto_process\n"
+	  "p = proto_process.Process(19, 'param')\n"
+	  "#set ownership to C++ code\n"
+	  "p.thisown = 0\n";
+
+  PyRun_SimpleString(buildPyProcess);
+  */
+
+  Py_DECREF(pModule);
+  
+  pModule = PyImport_AddModule("__main__");
+  pDict = PyModule_GetDict(pModule);
+  
+  //  PyObject *pPyProcess = PyMapping_GetItemString(pDict, "p"); 
+  // assert(pPyProcess);
+
+  // Matteo: PyTuple_SetItem steals the reference, so
+  // we don't DECREF pPyProcess. 
+  // See http://www.python.org/doc/2.4.2/api/refcountDetails.html#l2h-13
+  //  PyTuple_SetItem(pArgs, 0, pPyProcess);
+
+  // assert(pFunc);
+
+  /*  if(PyCallable_Check(pFunc)) 
+    {
+      PyObject* ret = PyObject_CallObject(pFunc, pArgs);
+      Py_DECREF(pArgs);
+      if(!ret) PyErr_Print();
+      else Py_DECREF(ret);
+    }
+  */
 
   
+}