/*
 *
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 *
 * Copyright (c) 1999-2008 Apple Inc.  All Rights Reserved.
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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/*
    File:       TCPListenerSocket.h

    Contains:   A TCP listener socket. When a new connection comes in, the listener
                attempts to assign the new connection to a socket object and a Task
                object. Derived classes must implement a method of getting new
                Task & socket objects
                    
    
*/


#ifndef __TCPLISTENERSOCKET_H__
#define __TCPLISTENERSOCKET_H__

#include "TCPSocket.h"
#include "IdleTask.h"

class TCPListenerSocket : public TCPSocket, public IdleTask
{
    public:

        TCPListenerSocket() :   TCPSocket(NULL, Socket::kNonBlockingSocketType), IdleTask(),
                                fAddr(0), fPort(0), fOutOfDescriptors(false), fSleepBetweenAccepts(false) {this->SetTaskName("TCPListenerSocket");}
        virtual ~TCPListenerSocket() {}
        
        //
        // Send a TCPListenerObject a Kill event to delete it.
                
        //addr = listening address. port = listening port. Automatically
        //starts listening
        OS_Error        Initialize(UInt32 addr, UInt16 port);

        //You can query the listener to see if it is failing to accept
        //connections because the OS is out of descriptors.
        Bool16      IsOutOfDescriptors() { return fOutOfDescriptors; }

        void        SlowDown() { fSleepBetweenAccepts = true; }
        void        RunNormal() { fSleepBetweenAccepts = false; }
        //derived object must implement a way of getting tasks & sockets to this object 
        virtual Task*   GetSessionTask(TCPSocket** outSocket) = 0;
        
        virtual SInt64  Run();
            
    private:
    
        enum
        {
            kTimeBetweenAcceptsInMsec = 1000,   //UInt32
            kListenQueueLength = 128            //UInt32
        };

        virtual void ProcessEvent(int eventBits);
        OS_Error    Listen(UInt32 queueLength);

        UInt32          fAddr;
        UInt16          fPort;
        
        Bool16          fOutOfDescriptors;
        Bool16          fSleepBetweenAccepts;
};
#endif // __TCPLISTENERSOCKET_H__

