- Super mega hacked implementation of python_policy_manager.

Haven't tried running it.


git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@380 3ecf2c5c-341e-0410-92b4-d18e462d057c

src/backend/pyloader/python_policy_manager.cc

@@ -20,9 +20,13 @@
 
 #include "python_policy_manager.hh"
 
+#include <Python.h>
+#include <glibmm/timer.h>
+
 #include <string>
 #include <cassert>
 #include <iostream>
+#include <unistd.h>
 using namespace sgpem;
 
 //static object
@@ -31,21 +35,22 @@ PythonPolicyManager* PythonPolicyManager::_instance = NULL;
 PythonPolicyManager::PythonPolicyManager()
   : _initialized(false)
 {
+  PyEval_InitThreads();
 }
 
 PythonPolicyManager* const
 PythonPolicyManager::get_instance()
 {
-    if(!_instance)
-	_instance = new PythonPolicyManager();
-    return _instance;
+  if(!_instance)
+    _instance = new PythonPolicyManager();
+  return _instance;
 }
 
 Policy&
 PythonPolicyManager::get_policy()
 {
-	// FIXME : assumes that _python_policy is always != NULL!
-	return *_python_policy;
+  // FIXME : assumes that _python_policy is always != NULL!
+  return *_python_policy;
 }
 
 void
@@ -69,13 +74,13 @@ PythonPolicyManager::init()
   // Okay, here we go.
   // Black magic at work. 
 
-  // FIXME : Hardcoded policy
+  // FIXME : Hardcoded policy name
   char* policy_name = "fcfs";
   PyObject* pLoadmeStr = PyString_FromString(policy_name);
-  PyObject* pModule = PyImport_Import(pLoadmeStr);
+  PyObject* pUserPolicyModule = PyImport_Import(pLoadmeStr);
   Py_DECREF(pLoadmeStr);
   
-  if( !pModule ) 
+  if( !pUserPolicyModule ) 
   {
       PyErr_Print(); // Error in import
       // FIXME : don't exit abruptly, but fall back gracefully
@@ -83,47 +88,38 @@ PythonPolicyManager::init()
   }
 
   // Dictionary with defined ``symbols'' for .pyc file
-  PyObject* pDict = PyModule_GetDict(pModule);
-  assert(pDict);
+  PyObject* pUserPolicyDict = PyModule_GetDict(pUserPolicyModule);
+  assert(pUserPolicyDict);
 
-  // Build up UserPythonScriptAdapter
-  {
-      // FIXME : Warning!! "import fcfs" shouldn't be here!!
-      std::string s = std::string("import ") + policy_name + "\n"
-	  "import ScriptAdapter\n"
-	  "_adapter = ScriptAdapter.ScriptAdapter(" +
-          policy_name + "." + policy_name + ")";
-      PyRun_SimpleString(s.c_str());
-  }
+  // Loads ScriptAdapter module and get its dictionary
+  pLoadmeStr = PyString_FromString("ScriptAdapter");
+  PyObject* pScriptAdapterModule = PyImport_Import(pLoadmeStr);
+  Py_DECREF(pLoadmeStr);
+  assert(pScriptAdapterModule);
+  PyObject* pScriptAdapterDict = PyModule_GetDict(pScriptAdapterModule);
+  assert(pScriptAdapterDict);
+  
+  // Now takes the user-defined policy class from pUserPolicyDict
+  PyObject* pPolicyClass = PyDict_GetItemString(pUserPolicyDict, policy_name);
+  assert(pPolicyClass); // FIXME needs stricter checking and exception throwing
+    
+  // Creates a new object of type ScriptAdapter :
+  // takes init function from ScriptAdapter class
+  PyObject* pAdapterClass = PyDict_GetItemString(pScriptAdapterDict, "ScriptAdapter");
+  PyObject* pAdapterCtorParam = PyTuple_New(1);
+  Py_INCREF(pPolicyClass); // PyTuple_SetItem steals a reference
+  PyTuple_SetItem(pAdapterCtorParam, 0, pPolicyClass);
+  PyObject* pAdapterObject = PyInstance_New(pAdapterClass, pAdapterCtorParam, NULL);
     
   // try code
-  const char* tryExecute = 
-      "_adapter.async_configure()\n"
-      "#set ownership to C++ code\n";
-      //"_adapter.thisown = 0\n";
-  PyRun_SimpleString(tryExecute);
+  PyObject_CallMethod(pAdapterObject, "async_configure", NULL);
     
-  Py_DECREF(pModule);
+  PyThreadState *_save;
+  Py_UNBLOCK_THREADS
+    sleep(5); // hack'a'ton! magggggiccc nummmbeeerrrrrs!!
   
-  // pModule = PyImport_AddModule("__main__");
-  // pDict = PyModule_GetDict(pModule);
+  Py_BLOCK_THREADS
       
-  //  PyObject *pPyProcess = PyMapping_GetItemString(pDict, "p"); 
-  // assert(pPyProcess);
+  // And now, who's your daddy, huh?
 
-  // 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);
-    }
-  */  
 }