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422 lines
11 KiB
422 lines
11 KiB
/*
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This file is part of the KDE games library
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Copyright (C) 2001 Burkhard Lehner (Burkhard.Lehner@gmx.de)
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License version 2 as published by the Free Software Foundation.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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/*
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KMessageIO class and subclasses KMessageSocket and KMessageDirect
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*/
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#ifndef _KMESSAGEIO_H_
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#define _KMESSAGEIO_H_
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#include <tqcstring.h>
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#include <tqhostaddress.h>
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#include <tqobject.h>
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#include <tqstring.h>
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#include <tqptrqueue.h>
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#include <tqfile.h>
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#include <kdebug.h>
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class TQSocket;
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class KProcess;
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//class TQFile;
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/**
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This abstract base class represents one end of a message connections
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between two clients. Each client has one object of a subclass of
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KMessageIO. Calling /e send() on one object will emit the signal
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/e received() on the other object, and vice versa.
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For each type of connection (TCP/IP socket, COM port, direct connection
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within the same class) a subclass of KMessageIO must be defined that
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implements the pure virtual methods /e send() and /e isConnected(),
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and sends the signals. (See /e KMessageSocket for an example implementation.)
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Two subclasses are already included: /e KMessageSocket (connection using
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TCP/IP sockets) and /e KMessageDirect (connection using method calls, both
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sides must be within the same process).
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*/
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class KMessageIO : public TQObject
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{
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Q_OBJECT
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TQ_OBJECT
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public:
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/**
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* The usual TQObject constructor, does nothing else.
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**/
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KMessageIO (TQObject *parent = 0, const char *name = 0);
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/**
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* The usual destructor, does nothing special.
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**/
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~KMessageIO ();
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/**
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* The runtime idendifcation
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*/
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virtual int rtti() const {return 0;}
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/**
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* @return Whether this KMessageIO is a network IO or not.
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**/
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//virtual bool isNetwork () const = 0;
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virtual bool isNetwork () const
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{
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kdError(11001) << "Calling PURE virtual isNetwork...BAD" << endl;
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return false;
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}
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/**
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This method returns the status of the object, whether it is already
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(or still) connected to another KMessageIO object or not.
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This is a pure virtual method, so it has to be implemented in a subclass
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of KMessageIO.
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*/
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//virtual bool isConnected () const = 0;
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virtual bool isConnected () const
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{
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kdError(11001) << "Calling PURE virtual isConencted...BAD" << endl;
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return false;
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}
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/**
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Sets the ID number of this object. This number can for example be used to
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distinguish several objects in a server.
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NOTE: Sometimes it is useful to let two connected KMessageIO objects
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have the same ID number. You have to do so yourself, KMessageIO doesn't
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change this value on its own!
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*/
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void setId (TQ_UINT32 id);
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/**
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Queries the ID of this object.
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*/
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TQ_UINT32 id ();
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/**
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@since 3.2
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@return 0 in the default implementation. Reimplemented in @ref KMessageSocket.
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*/
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virtual TQ_UINT16 peerPort () const { return 0; }
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/**
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@since 3.2
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@return "localhost" in the default implementation. Reimplemented in @ref KMessageSocket
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*/
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virtual TQString peerName () const { return TQString::fromLatin1("localhost"); }
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signals:
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/**
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This signal is emitted when /e send() on the connected KMessageIO
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object is called. The parameter contains the same data array in /e msg
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as was used in /e send().
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*/
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void received (const TQByteArray &msg);
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/**
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This signal is emitted when the connection is closed. This can be caused
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by a hardware error (e.g. broken internet connection) or because the other
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object was killed.
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Note: Sometimes a broken connection can be undetected for a long time,
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or may never be detected at all. So don't rely on this signal!
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*/
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void connectionBroken ();
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public slots:
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/**
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This slot sends the data block in /e msg to the connected object, that will
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emit /e received().
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For a concrete class, you have to subclass /e KMessageIO and overwrite this
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method. In the subclass, implement this method as an ordinary method, not
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as a slot! (Otherwise another slot would be defined. It would work, but uses
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more memory and time.) See /e KMessageSocket for an example implementation.
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*/
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virtual void send (const TQByteArray &msg) = 0;
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protected:
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TQ_UINT32 m_id;
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};
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/**
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This class implements the message communication using a TCP/IP socket. The
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object can connect to a server socket, or can use an already connected socket.
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*/
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class KMessageSocket : public KMessageIO
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{
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Q_OBJECT
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TQ_OBJECT
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public:
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/**
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Connects to a server socket on /e host with /e port. host can be an
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numerical (e.g. "192.168.0.212") or symbolic (e.g. "wave.peter.org")
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IP address. You can immediately use the /e sendSystem() and
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/e sendBroadcast() methods. The messages are stored and sent to the
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receiver after the connection is established.
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If the connection could not be established (e.g. unknown host or no server
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socket at this port), the signal /e connectionBroken is emitted.
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*/
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KMessageSocket (TQString host, TQ_UINT16 port, TQObject *parent = 0,
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const char *name = 0);
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/**
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Connects to a server socket on /e host with /e port. You can immediately
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use the /e sendSystem() and /e sendBroadcast() methods. The messages are
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stored and sent to the receiver after the connection is established.
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If the connection could not be established (e.g. unknown host or no server
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socket at this port), the signal /e connectionBroken is emitted.
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*/
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KMessageSocket (TQHostAddress host, TQ_UINT16 port, TQObject *parent = 0,
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const char *name = 0);
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/**
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Uses /e socket to do the communication.
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The socket should already be connected, or at least be in /e connecting
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state.
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Note: The /e socket object is then owned by the /e KMessageSocket object.
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So don't use it otherwise any more and don't delete it. It is deleted
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together with this KMessageSocket object. (Use 0 as parent for the TQSocket
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object t ensure it is not deleted.)
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*/
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KMessageSocket (TQSocket *socket, TQObject *parent = 0, const char *name = 0);
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/**
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Uses the socket specified by the socket descriptor socketFD to do the
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communication. The socket must already be connected.
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This constructor can be used with a TQServerSocket within the (pure
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virtual) method /e newConnection.
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Note: The socket is then owned by the /e KMessageSocket object. So don't
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manipulate the socket afterwards, especially don't close it. The socket is
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automatically closed when KMessageSocket is deleted.
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*/
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KMessageSocket (int socketFD, TQObject *parent = 0, const char *name = 0);
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/**
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Destructor, closes the socket.
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*/
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~KMessageSocket ();
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/**
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* The runtime idendifcation
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*/
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virtual int rtti() const {return 1;}
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/**
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@since 3.2
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@return The port that this object is connected to. See TQSocket::peerPort
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*/
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virtual TQ_UINT16 peerPort () const;
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/**
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@since 3.2
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@return The hostname this object is connected to. See TQSocket::peerName.
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*/
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virtual TQString peerName () const;
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/**
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@return TRUE as this is a network IO.
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*/
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bool isNetwork() const { return true; }
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/**
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Returns true if the socket is in state /e connected.
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*/
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bool isConnected () const;
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/**
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Overwritten slot method from KMessageIO.
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Note: It is not declared as a slot method, since the slot is already
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defined in KMessageIO as a virtual method.
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*/
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void send (const TQByteArray &msg);
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protected slots:
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virtual void processNewData ();
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protected:
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void initSocket ();
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TQSocket *mSocket;
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bool mAwaitingHeader;
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TQ_UINT32 mNextBlockLength;
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bool isRecursive; // workaround for "bug" in TQSocket, TQt 2.2.3 or older
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};
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/**
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This class implements the message communication using function calls
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directly. It can only be used when both sides of the message pipe are
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within the same process. The communication is very fast.
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To establish a communication, you have to create two instances of
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KMessageDirect, the first one with no parameters in the constructor,
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the second one with the first as parameter:
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/code
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KMessageDirect *peer1, *peer2;
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peer1 = new KMessageDirect (); // unconnected
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peer2 = new KMessageDirect (peer1); // connect with peer1
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/endcode
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The connection is only closed when one of the instances is deleted.
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*/
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class KMessageDirect : public KMessageIO
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{
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Q_OBJECT
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TQ_OBJECT
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public:
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/**
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Creates an object and connects it to the object given in the first
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parameter. Use 0 as first parameter to create an unconnected object,
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that is later connected.
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If that object is already connected, the object remains unconnected.
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*/
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KMessageDirect (KMessageDirect *partner = 0, TQObject *parent = 0, const char
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*name = 0);
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/**
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Destructor, closes the connection.
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*/
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~KMessageDirect ();
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/**
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* The runtime idendifcation
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*/
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virtual int rtti() const {return 2;}
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/**
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@return FALSE as this is no network IO.
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*/
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bool isNetwork() const { return false; }
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/**
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Returns true, if the object is connected to another instance.
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If you use the first constructor, the object is unconnected unless another
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object is created with this one as parameter.
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The connection can only be closed by deleting one of the objects.
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*/
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bool isConnected () const;
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/**
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Overwritten slot method from KMessageIO.
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Note: It is not declared as a slot method, since the slot is already
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defined in KMessageIO as a virtual method.
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*/
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void send (const TQByteArray &msg);
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protected:
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KMessageDirect *mPartner;
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};
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class KMessageProcess : public KMessageIO
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{
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Q_OBJECT
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TQ_OBJECT
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public:
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KMessageProcess(TQObject *parent, TQString file);
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~KMessageProcess();
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bool isConnected() const;
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void send (const TQByteArray &msg);
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void writeToProcess();
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/**
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@return FALSE as this is no network IO.
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*/
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bool isNetwork() const { return false; }
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/**
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* The runtime idendifcation
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*/
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virtual int rtti() const {return 3;}
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public slots:
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void slotReceivedStdout(KProcess *proc, char *buffer, int buflen);
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void slotReceivedStderr(KProcess *proc, char *buffer, int buflen);
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void slotProcessExited(KProcess *p);
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void slotWroteStdin(KProcess *p);
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private:
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TQString mProcessName;
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KProcess *mProcess;
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TQPtrQueue <TQByteArray> mQueue;
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TQByteArray *mSendBuffer;
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TQByteArray mReceiveBuffer;
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unsigned int mReceiveCount;
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};
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class KMessageFilePipe : public KMessageIO
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{
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Q_OBJECT
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TQ_OBJECT
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public:
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KMessageFilePipe(TQObject *parent,TQFile *readFile,TQFile *writeFile);
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~KMessageFilePipe();
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bool isConnected() const;
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void send (const TQByteArray &msg);
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void exec();
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/**
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@return FALSE as this is no network IO.
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*/
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bool isNetwork() const { return false; }
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/**
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* The runtime idendifcation
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*/
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virtual int rtti() const {return 4;}
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private:
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TQFile *mReadFile;
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TQFile *mWriteFile;
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TQByteArray mReceiveBuffer;
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unsigned int mReceiveCount;
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};
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#endif
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