sgpemv2/plugins/pyloader/src/python_policy_manager.cc

173 lines
4.3 KiB
C++

// src/backend/pyloader/python_policy_manager.cc - Copyright 2005, 2006, University
// of Padova, dept. of Pure and Applied
// Mathematics
//
// This file is part of SGPEMv2.
//
// This 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.
//
// SGPEMv2 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 SGPEMv2; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#include "python_policy_manager.hh"
#include "global_preferences.hh"
#include "policies_gatekeeper.hh"
#include <Python.h>
#include <glibmm/ustring.h>
#include <glibmm/timer.h>
#include <glibmm/fileutils.h>
#include <glibmm/pattern.h>
#include <algorithm>
#include <cassert>
#include <functional>
#include <iostream>
#include <string>
#include <iostream>
#include <unistd.h>
using namespace sgpem;
using std::vector;
using std::cout;
using std::endl;
// Concatenate a string with all the policies directories
struct pol_dirs_concat : public std::unary_function<void, const Glib::ustring&>
{
public:
pol_dirs_concat(Glib::ustring& cat) : _cat(cat) {}
void operator()(const Glib::ustring& add)
{
// Please note that this string will end finishing with
// and additional ","!
_cat += "'" + add + "', ";
}
private:
Glib::ustring& _cat;
};
//static object
PythonPolicyManager* PythonPolicyManager::_instance = NULL;
PythonPolicyManager::PythonPolicyManager()
: _initialized(false)
{
PyEval_InitThreads();
}
PythonPolicyManager::~PythonPolicyManager()
{
for_each(_policies.begin(), _policies.end(), ptr_fun(operator delete));
}
PythonPolicyManager* const
PythonPolicyManager::get_instance()
{
if(!_instance)
_instance = new PythonPolicyManager();
return _instance;
}
// Policy&
// PythonPolicyManager::get_policy()
// {
// // FIXME : assumes that _python_policy is always != NULL!
// return *_python_policy;
// }
void
PythonPolicyManager::init()
{
if(_initialized)
// No-op
return;
Py_Initialize();
_initialized = true;
// The following lines are ugly, but necessary if we use
// non-standard installation directories. Theoretically,
// it should be up to the user to set correct
// environment variables.
// FIXME: find better way to achieve this.
GlobalPreferences& prefs = GlobalPreferences::get_instance();
Glib::ustring importdirs = "import sys\n"
"sys.path[:0] = [ ";
for_each(prefs.policies_dir_begin(),
prefs.policies_dir_end(),
pol_dirs_concat(importdirs));
importdirs += " '" SHAREDIR "' ]\n";
PyRun_SimpleString(importdirs.c_str());
// Okay, here we go.
// Black magic at work.
collect_policies();
}
vector<Policy*>
PythonPolicyManager::get_avail_policies()
{
return _policies;
}
void
PythonPolicyManager::collect_policies()
{
GlobalPreferences& prefs = GlobalPreferences::get_instance();
GlobalPreferences::dir_iterator dir_it = prefs.policies_dir_begin();
GlobalPreferences::dir_iterator dir_end = prefs.policies_dir_end();
for(; dir_it != dir_end; ++dir_it)
{
Glib::Dir dir(dir_it->c_str());
cout << "Opening directory " << *dir_it << "..." << endl;
for(Glib::DirIterator file_it = dir.begin(); file_it != dir.end(); ++file_it)
{
cout << "\tChecking if " << *file_it << " is a Python script... " << endl;
Glib::PatternSpec dot_py("*.py");
if(dot_py.match(*file_it))
{
cout << "\t\tIt is.\n";
//strip extension
std::string policy_name = (*file_it).substr(0, (*file_it).size() - 3);
PythonPolicy *pypolicy = new PythonPolicy(policy_name.c_str());
_policies.push_back(pypolicy);
//FIXME remove me when get_policy is dropped
if(policy_name == "fcfs")
{
_python_policy = pypolicy;
PoliciesGatekeeper::get_instance().activate_policy(&History::get_instance(), pypolicy);
}
}
}
}
}