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/*
Copyright (C) 2000, 2001, 2002 RiskMap srl
This file is part of QuantLib, a free-software/open-source library
for financial quantitative analysts and developers - http://quantlib.org/
QuantLib is free software: you can redistribute it and/or modify it under the
terms of the QuantLib license. You should have received a copy of the
license along with this program; if not, please email ferdinando@ametrano.net
The license is also available online at http://quantlib.org/html/license.html
This program 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 license for more details.
*/
// $Id: Observer.i,v 1.11 2002/03/05 16:58:17 lballabio Exp $
#ifndef quantlib_observer_i
#define quantlib_observer_i
%{
using QuantLib::Patterns::Observer;
using QuantLib::Patterns::Observable;
using QuantLib::Handle;
typedef Handle<Observer> ObserverHandle;
typedef Handle<Observable> ObservableHandle;
%}
%name(Observable) class ObservableHandle {
private:
ObservableHandle();
public:
~ObservableHandle();
};
// Python function to be called when a given observable changes
%typemap(python,in) PyObject* pyObserverCallback {
$target = $source;
}
%{
// C++ wrapper for Python observer
// the observables it registers with should be stored from Python
// so that they can be unregistered
class PyObserver : public Observer {
public:
PyObserver(PyObject* pyObserverCallback)
: pyObserverCallback_(pyObserverCallback) {
/* make sure the Python object stays alive
as long as we need it */
Py_XINCREF(pyObserverCallback_);
}
PyObserver(const PyObserver& o)
: pyObserverCallback_(o.pyObserverCallback_) {
/* make sure the Python object stays alive
as long as we need it */
Py_XINCREF(pyObserverCallback_);
}
PyObserver& operator=(const PyObserver& o) {
if ((this != &o) && (pyObserverCallback_ != o.pyObserverCallback_)) {
Py_XDECREF(pyObserverCallback_);
pyObserverCallback_ = o.pyObserverCallback_;
Py_XINCREF(pyObserverCallback_);
}
return *this;
}
~PyObserver() {
// now it can go as far as we are concerned
Py_XDECREF(pyObserverCallback_);
}
void update() {
PyObject* pyResult = PyObject_CallFunction(pyObserverCallback_,NULL);
QL_ENSURE(pyResult != NULL, "failed to notify Python observer");
Py_XDECREF(pyResult);
}
private:
PyObject* pyObserverCallback_;
};
%}
// Python wrapper
%name(Observer) class PyObserver {
public:
PyObserver(PyObject* pyObserverCallback);
~PyObserver();
void registerWith(const ObservableHandle&);
void unregisterWith(const ObservableHandle&);
};
#endif
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