173 lines
4.3 KiB
C++
173 lines
4.3 KiB
C++
// src/backend/pyloader/python_policy_manager.cc - Copyright 2005, 2006, University
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// of Padova, dept. of Pure and Applied
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// Mathematics
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//
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// This file is part of SGPEMv2.
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//
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// This is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// SGPEMv2 is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with SGPEMv2; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#include "python_policy_manager.hh"
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#include "global_preferences.hh"
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#include "policies_gatekeeper.hh"
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#include <Python.h>
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#include <glibmm/ustring.h>
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#include <glibmm/timer.h>
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#include <glibmm/fileutils.h>
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#include <glibmm/pattern.h>
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#include <algorithm>
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#include <cassert>
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#include <functional>
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#include <iostream>
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#include <string>
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#include <iostream>
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#include <unistd.h>
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using namespace sgpem;
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using std::vector;
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using std::cout;
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using std::endl;
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// Concatenate a string with all the policies directories
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struct pol_dirs_concat : public std::unary_function<void, const Glib::ustring&>
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{
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public:
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pol_dirs_concat(Glib::ustring& cat) : _cat(cat) {}
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void operator()(const Glib::ustring& add)
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{
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// Please note that this string will end finishing with
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// and additional ","!
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_cat += "'" + add + "', ";
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}
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private:
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Glib::ustring& _cat;
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};
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//static object
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PythonPolicyManager* PythonPolicyManager::_instance = NULL;
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PythonPolicyManager::PythonPolicyManager()
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: _initialized(false)
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{
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PyEval_InitThreads();
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}
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PythonPolicyManager::~PythonPolicyManager()
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{
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for_each(_policies.begin(), _policies.end(), ptr_fun(operator delete));
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}
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PythonPolicyManager* const
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PythonPolicyManager::get_instance()
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{
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if(!_instance)
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_instance = new PythonPolicyManager();
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return _instance;
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}
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// Policy&
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// PythonPolicyManager::get_policy()
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// {
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// // FIXME : assumes that _python_policy is always != NULL!
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// return *_python_policy;
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// }
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void
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PythonPolicyManager::init()
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{
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if(_initialized)
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// No-op
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return;
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Py_Initialize();
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_initialized = true;
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// The following lines are ugly, but necessary if we use
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// non-standard installation directories. Theoretically,
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// it should be up to the user to set correct
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// environment variables.
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// FIXME: find better way to achieve this.
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GlobalPreferences& prefs = GlobalPreferences::get_instance();
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Glib::ustring importdirs = "import sys\n"
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"sys.path[:0] = [ ";
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for_each(prefs.policies_dir_begin(),
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prefs.policies_dir_end(),
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pol_dirs_concat(importdirs));
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importdirs += " '" SHAREDIR "' ]\n";
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PyRun_SimpleString(importdirs.c_str());
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// Okay, here we go.
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// Black magic at work.
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collect_policies();
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}
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vector<Policy*>
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PythonPolicyManager::get_avail_policies()
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{
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return _policies;
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}
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void
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PythonPolicyManager::collect_policies()
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{
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GlobalPreferences& prefs = GlobalPreferences::get_instance();
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GlobalPreferences::dir_iterator dir_it = prefs.policies_dir_begin();
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GlobalPreferences::dir_iterator dir_end = prefs.policies_dir_end();
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for(; dir_it != dir_end; ++dir_it)
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{
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Glib::Dir dir(dir_it->c_str());
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cout << "Opening directory " << *dir_it << "..." << endl;
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for(Glib::DirIterator file_it = dir.begin(); file_it != dir.end(); ++file_it)
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{
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cout << "\tChecking if " << *file_it << " is a Python script... " << endl;
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Glib::PatternSpec dot_py("*.py");
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if(dot_py.match(*file_it))
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{
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cout << "\t\tIt is.\n";
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//strip extension
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std::string policy_name = (*file_it).substr(0, (*file_it).size() - 3);
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PythonPolicy *pypolicy = new PythonPolicy(policy_name.c_str());
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_policies.push_back(pypolicy);
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//FIXME remove me when get_policy is dropped
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if(policy_name == "fcfs")
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{
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_python_policy = pypolicy;
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PoliciesGatekeeper::get_instance().activate_policy(&History::get_instance(), pypolicy);
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}
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}
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}
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}
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}
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