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#include <boost/function.hpp>
#include <boost/any.hpp>
#include <boost/shared_array.hpp>
#include <boost/tuple/tuple.hpp>
#include <boost/tuple/tuple_comparison.hpp>
#include <boost/lexical_cast.hpp>
#include <vector>
#include <map>
#include <stdexcept>
#include <string>
#include "utility.hh"
class FDMultiplexerException : public std::runtime_error
{
public:
FDMultiplexerException(const std::string& str) : std::runtime_error(str)
{}
};
/** Very simple FD multiplexer, based on callbacks and boost::any parameters
As a special service, this parameter is kept around and can be modified,
allowing for state to be stored inside the multiplexer.
It has some "interesting" semantics
*/
class FDMultiplexer
{
public:
// typedef boost::variant<PacketID, TCPConnection> funcparam_t;
typedef boost::any funcparam_t;
protected:
typedef boost::function< void(int, funcparam_t&) > callbackfunc_t;
struct Callback
{
callbackfunc_t d_callback;
funcparam_t d_parameter;
struct timeval d_ttd;
};
public:
FDMultiplexer() : d_inrun(false)
{}
virtual ~FDMultiplexer()
{}
virtual int run(struct timeval* tv) = 0;
//! Add an fd to the read watch list - currently an fd can only be on one list at a time!
virtual void addReadFD(int fd, callbackfunc_t toDo, const funcparam_t& parameter=funcparam_t())
{
this->addFD(d_readCallbacks, fd, toDo, parameter);
}
//! Add an fd to the write watch list - currently an fd can only be on one list at a time!
virtual void addWriteFD(int fd, callbackfunc_t toDo, const funcparam_t& parameter=funcparam_t())
{
this->addFD(d_writeCallbacks, fd, toDo, parameter);
}
//! Remove an fd from the read watch list. You can't call this function on an fd that is closed already!
/** WARNING: references to 'parameter' become invalid after this function! */
virtual void removeReadFD(int fd)
{
this->removeFD(d_readCallbacks, fd);
}
//! Remove an fd from the write watch list. You can't call this function on an fd that is closed already!
/** WARNING: references to 'parameter' become invalid after this function! */
virtual void removeWriteFD(int fd)
{
this->removeFD(d_writeCallbacks, fd);
}
virtual void setReadTTD(int fd, struct timeval tv, int timeout)
{
if(!d_readCallbacks.count(fd))
throw FDMultiplexerException("attempt to timestamp fd not in the multiplexer");
tv.tv_sec += timeout;
d_readCallbacks[fd].d_ttd=tv;
}
virtual funcparam_t& getReadParameter(int fd)
{
if(!d_readCallbacks.count(fd))
throw FDMultiplexerException("attempt to look up data in multiplexer for unlisted fd "+boost::lexical_cast<std::string>(fd));
return d_readCallbacks[fd].d_parameter;
}
virtual std::vector<std::pair<int, funcparam_t> > getTimeouts(const struct timeval& tv)
{
std::vector<std::pair<int, funcparam_t> > ret;
for(callbackmap_t::iterator i=d_readCallbacks.begin(); i!=d_readCallbacks.end(); ++i)
if(i->second.d_ttd.tv_sec && boost::tie(tv.tv_sec, tv.tv_usec) > boost::tie(i->second.d_ttd.tv_sec, i->second.d_ttd.tv_usec))
ret.push_back(std::make_pair(i->first, i->second.d_parameter));
return ret;
}
typedef FDMultiplexer* getMultiplexer_t();
typedef std::multimap<int, getMultiplexer_t*> FDMultiplexermap_t;
static FDMultiplexermap_t& getMultiplexerMap()
{
static FDMultiplexermap_t theMap;
return theMap;
}
virtual std::string getName() = 0;
protected:
typedef std::map<int, Callback> callbackmap_t;
callbackmap_t d_readCallbacks, d_writeCallbacks;
virtual void addFD(callbackmap_t& cbmap, int fd, callbackfunc_t toDo, const funcparam_t& parameter)=0;
virtual void removeFD(callbackmap_t& cbmap, int fd)=0;
bool d_inrun;
callbackmap_t::iterator d_iter;
void accountingAddFD(callbackmap_t& cbmap, int fd, callbackfunc_t toDo, const funcparam_t& parameter)
{
Callback cb;
cb.d_callback=toDo;
cb.d_parameter=parameter;
memset(&cb.d_ttd, 0, sizeof(cb.d_ttd));
if(cbmap.count(fd))
throw FDMultiplexerException("Tried to add fd "+boost::lexical_cast<std::string>(fd)+ " to multiplexer twice");
cbmap[fd]=cb;
}
void accountingRemoveFD(callbackmap_t& cbmap, int fd)
{
if(!cbmap.erase(fd))
throw FDMultiplexerException("Tried to remove unlisted fd "+boost::lexical_cast<std::string>(fd)+ " from multiplexer");
}
};
class SelectFDMultiplexer : public FDMultiplexer
{
public:
SelectFDMultiplexer()
{}
virtual ~SelectFDMultiplexer()
{}
virtual int run(struct timeval* tv);
virtual void addFD(callbackmap_t& cbmap, int fd, callbackfunc_t toDo, const funcparam_t& parameter);
virtual void removeFD(callbackmap_t& cbmap, int fd);
std::string getName()
{
return "select";
}
};
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