multisession.hpp

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//-------------------------------------------------------------------------------------------------
/*

Fix8 is released under the GNU LESSER GENERAL PUBLIC LICENSE Version 3.

Fix8 Open Source FIX Engine.
Copyright (C) 2010-16 David L. Dight <fix@fix8.org>

Fix8 is free software: you can  redistribute it and / or modify  it under the  terms of the
GNU Lesser General  Public License as  published  by the Free  Software Foundation,  either
version 3 of the License, or (at your option) any later version.

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even the  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

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If not, see <http://www.gnu.org/licenses/>.

BECAUSE THE PROGRAM IS  LICENSED FREE OF  CHARGE, THERE IS NO  WARRANTY FOR THE PROGRAM, TO
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*/
//-------------------------------------------------------------------------------------------------
#ifndef FIX8_MULTISESSSION_HPP_
#define FIX8_MULTISESSSION_HPP_

//-------------------------------------------------------------------------------------------------
namespace FIX8 {

//-------------------------------------------------------------------------------------------------
class ServerManager
{
   std::map<Poco::Net::ServerSocket, ServerSessionBase *> _servermap;

public:
   ServerManager() = default;

   virtual ~ServerManager()
      { std::for_each (_servermap.begin(), _servermap.end(), [](decltype(_servermap)::value_type& pp){ delete pp.second; }); }

   bool add(ServerSessionBase *what)
   {
      if (!what || !what->_server_sock)
         throw f8Exception("bad or missing server socket");
      _servermap.insert({*what->_server_sock, what});
      return true;
   }

   ServerSessionBase *select(const Poco::Timespan& timeout=Poco::Timespan(250000)) const
   {
      Poco::Net::Socket::SocketList readList, writeList, exceptList;
      for (auto& pp : _servermap)
         readList.push_back(pp.first);
      return Poco::Net::Socket::select(readList, writeList, exceptList, timeout) && !readList.empty()
         ? _servermap.find(readList[0])->second : nullptr;
   }

   size_t select_l(std::vector<ServerSessionBase *>& result, const Poco::Timespan& timeout=Poco::Timespan(250000)) const
   {
      result.clear();
      Poco::Net::Socket::SocketList readList, writeList, exceptList;
      for (auto& pp : _servermap)
         readList.push_back(pp.first);
      if (Poco::Net::Socket::select(readList, writeList, exceptList, timeout) && !readList.empty())
         std::for_each(readList.begin(), readList.end(), [&](decltype(readList)::value_type& pp)
            { result.push_back(_servermap.find(pp)->second); });
      return result.size();
   }

   unsigned size() const { return static_cast<unsigned>(_servermap.size()); }
};

//-------------------------------------------------------------------------------------------------
template <typename T>
class SessionManager
{
   f8_mutex _mutex;
   std::map<f8String, T*> _sessionmap;

public:
   SessionManager() = default;

   virtual ~SessionManager()
   {
      f8_scoped_lock guard(_mutex);
      std::for_each (_sessionmap.begin(), _sessionmap.end(), [](typename decltype(_sessionmap)::value_type& pp){ delete pp.second; });
   }

   bool add(const f8String& name, T *what)
   {
      if (!what)
         throw f8Exception("bad or missing session");
      f8_scoped_lock guard(_mutex);
      return _sessionmap.insert({name, what}).second;
   }

   T *for_each_if(std::function<bool(T*)> func)
   {
      for (auto& pp : _sessionmap)
      {
         f8_scoped_lock guard(_mutex);
         if (!func(pp.second))
            return pp.second;
      }
      return nullptr;
   }

   bool remove(const f8String& name)
   {
      f8_scoped_lock guard(_mutex);
      auto itr(_sessionmap.find(name));
      if (itr == _sessionmap.end())
         return false;
      delete itr->second;
      _sessionmap.erase(itr);
      return true;
   }

   T *find(const f8String& name)
   {
      f8_scoped_lock guard(_mutex);
      const auto itr(_sessionmap.find(name));
      return itr == _sessionmap.cend() ? nullptr : itr->second;
   }

   T *operator[] (const f8String& name) const { return find(name); }

   unsigned size() const { return static_cast<unsigned>(_sessionmap.size()); }
};

//-------------------------------------------------------------------------------------------------
using ClientManager = SessionManager<ClientSessionBase>;
using SessionInstanceManager = SessionManager<SessionInstanceBase>;

}

#endif // FIX8_MULTISESSSION_HPP_