Hello All,
I am trying to implement plug-ins system using BOOST Python but a little
stuck. I've read documentation a couple of times and have feeling that
missed something pretty simple.
Below simplified version what I am trying to do:
// abstract Base interface class
class IBasePlugins
{
public:
virtual ~IBasePlugins() {};
virtual bool canHandle(int type) = 0;
virtual void handle() = 0;
};
//some C++ internal plugin (no need to expose to python)
class IntrPlugin : public IBasePlugins
{
public:
IntrPlugin() : handle_type(1) {}
bool canHandle(int type) {
return type == handle_type;
}
void handle() {
std::cout << "handle() from internal plugin" << std::endl;
}
private:
int handle_type;
};
// class to manage plug-ins
typedef boost::shared_ptr<IPlugins> PluginsPtrType;
typedef vector<PluginsPtrType> VPluginsType;
class PluginsMgr
{
public:
static void register(PluginsPtrType plugin) {
vplugins.puch_back(plugin);
}
static void run(int type) {
VPluginsType::iterator it;
for(it = vplugins.begin(); it != vplugins.end(); it++)
if( (*it)->canHandle(type) ) (*it)->handle();
}
private:
VPluginsType vplugins;
};
// export to python
struct IBasePluginsWrap : public IBasePlugins {
IBasePluginsWrap(PyObject* self_): self(self_) {}
bool canHandle(int type) {
return call_method< bool >(self, "canHandle", type);
}
void handle() {
call_method< void >(self, "handle");
}
PyObject* self;
};
BOOST_PYTHON_MODULE(pyPlugins)
{
class_< IBasePlugins, IBasePluginsWrap, boost::noncopyable >("IBasePlugins")
.def("canHandle", pure_virtual(&IBasePlugins::canHandle))
.def("handle", pure_virtual(&IBasePlugins::handle))
;
class_< PluginsMgr >("PluginsMgr")
.def("registerPlugin", &PlgMgr::registerPlugin)
.staticmethod("registerPlugin")
.def("run", &PlgMgr::run)
.staticmethod("run")
;
register_ptr_to_python<PluginsPtrType>();
}
Then I am using it from python as follows:
from pyPlugins import *
class PyTestPlugin(IBasePlugins):
def __init__(self):
self.handle_type = 2
def canHandle(self, type):
return type == handle_type
def handle(self):
print "handle() from python plugin"
pm = PluginsMgr()
testplg = PyTestPlugin()
pm.registerPlugin(testplg)
And have error that C++ signature mismatch.
Thank you in advance. I will really appreciate any help.
Kind regards,
Nodir
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