Service.h

/*
 * Copyright (C) 2012 by Marc Boris Duerner
 * 
 * This library 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 2.1 of the License, or (at your option) any later version.
 * 
 * As a special exception, you may use this file as part of a free
 * software library without restriction. Specifically, if other files
 * instantiate templates or use macros or inline functions from this
 * file, or you compile this file and link it with other files to
 * produce an executable, this file does not by itself cause the
 * resulting executable to be covered by the GNU General Public
 * License. This exception does not however invalidate any other
 * reasons why the executable file might be covered by the GNU Library
 * General Public License.
 * 
 * This library 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 GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
#ifndef Pt_Http_Service_h
#define Pt_Http_Service_h
 
#include <Pt/Http/Api.h>
#include <Pt/Http/Responder.h>
#include <Pt/Types.h>
#include <Pt/Allocator.h>
#include <Pt/NonCopyable.h>
#include <Pt/Signal.h>
#include <string>
 
namespace Pt {
 
namespace Http {
 
class Request;
class IOStream;

class PT_HTTP_API Service : private NonCopyable
{
    friend class ServerImpl;
 
    public:
        Service();

        virtual ~Service();

        Responder* getResponder(const Request&);
        
        void releaseResponder(Responder*);

        Signal<IOStream*, const std::string&>& upgradeRequested();
 
    protected:
        virtual Responder* onGetResponder(const Request&) = 0;
        
        virtual void onReleaseResponder(Responder*) = 0;

 
    private:
        // service specific options need to be set in Service ctor so it can
        // be used concurrently by server threads without locking
        Pt::varint_t _r0;
        Pt::varint_t _r1;
        Pt::varint_t _r2;
        Signal<IOStream*, const std::string&> _upgradeRequested;
};

template <typename R, typename Alloc = Allocator>
class BasicService : public Service
{
    public:
        BasicService()
        { }

        ~BasicService()
        { }
 
    protected:
        virtual Responder* onGetResponder(const Request&)
        {
            void* r = _alloc.allocate( sizeof(R) );
            return new(r) R(*this);
        }
 
        virtual void onReleaseResponder(Responder* r)
        {
            r->~Responder();
            _alloc.deallocate( r, sizeof(R) );
        }
 
    private:
        Alloc _alloc;
};
 
} // namespace Http
 
} // namespace Pt
 
#endif // Pt_Http_Service_h