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tdegames/libtdegames/kgame/kmessageclient.h

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/*
This file is part of the KDE games library
Copyright (C) 2001 Burkhard Lehner (Burkhard.Lehner@gmx.de)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License version 2 as published by the Free Software Foundation.
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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef __KMESSAGECLIENT_H__
#define __KMESSAGECLIENT_H__
#include <tqobject.h>
#include <tqstring.h>
#include <tqvaluelist.h>
class KMessageIO;
class KMessageServer;
class KMessageClientPrivate;
/**
@short A client to connect to a KMessageServer
This class implements a client that can connect to a KMessageServer object.
It can be used to exchange messages between clients.
Usually you will connect the signals broadcastReceived and forwardReceived to
some specific slots. In these slot methods you can analyse the messages that are
sent to you from other clients.
To send messages to other clients, use the methods sendBroadcast() (to send to all
clients) or sendForward() (to send to a list of selected clients).
If you want to communicate with the KMessageServer object directly (on a more low
level base), use the method sendServerMessage to send a command to the server and
connect to the signal serverMessageReceived to see all the incoming messages.
In that case the messages must be of the format specified in KMessageServer.
@author Burkhard Lehner <Burkhard.Lehner@gmx.de>
*/
class KMessageClient : public TQObject
{
Q_OBJECT
TQ_OBJECT
public:
/**
Constructor.
Creates an unconnected KMessageClient object. Use setServer() later to connect to a
KMessageServer object.
*/
KMessageClient (TQObject *parent = 0, const char *name = 0);
/**
Destructor.
Disconnects from the server, if any connection was established.
*/
~KMessageClient ();
/**
@return The client ID of this client. Every client that is connected to a KMessageServer
has a unique ID number.
NOTE: As long as the object is not yet connected to the server, and as long as the server
hasn't sent the client ID, this method returns 0.
*/
TQ_UINT32 id () const;
/**
@return Whether or not this client is the server admin.
One of the clients connected to the server is the admin and can administrate the server
(set maximum number of clients, remove clients, ...).
If you use admin commands without being the admin, these commands are simply ignored by
the server.
NOTE: As long as you are not connected to a server, this method returns false.
*/
bool isAdmin () const;
/**
@return The ID of the admin client on the message server.
*/
TQ_UINT32 adminId() const;
/**
@return The list of the IDs of all the message clients connected to the message server.
*/
const TQValueList <TQ_UINT32> &clientList() const;
/**
Connects the client to (another) server.
Tries to connect via a TCP/IP socket to a KMessageServer object
on the given host, listening on the specified port.
If we were already connected, the old connection is closed.
@param host The name of the host to connect to. Must be either a hostname which can
be resolved to an IP or just an IP
@param port The port to connect to
*/
void setServer (const TQString &host, TQ_UINT16 port);
/**
Connects the client to (another) server.
Connects to the given server, using KMessageDirect.
(The server object has to be in the same process.)
If we were already connected, the old connection is closed.
@param server The KMessageServer to connect to
*/
void setServer (KMessageServer *server);
/**
* Corresponds to setServer(0); but also emits the connectionBroken signal
**/
void disconnect();
/**
Connects the client to (another) server.
To use this method, you have to create a KMessageIO object with new (indeed you must
create an instance of a subclass of KMessageIO, e.g. KMessageSocket or KMessageDirect).
This object must already be connected to the new server.
Calling this method disconnects any earlier connection, and uses the new KMessageIO
object instead. This object gets owned by the KMessageClient object, so don't delete
or manipulate it afterwards.
With this method it is possible to change the server on the fly. But be careful that
there are no important messages from the old server not yet delivered.
NOTE: It is very likely that we will have another client ID on the new server. The
value returned by clientID may be a little outdated until the new server tells us
our new ID.
NOTE: The two other setServer methods are for convenience. If you use them, you don't
have to create a KMessageIO object yourself.
*/
virtual void setServer (KMessageIO *connection);
/**
@return True, if a connection to a KMessageServer has been started, and if the
connection is ready for transferring data. (It will return false e.g. as long as
a socket connection hasn't been established, and it will also return false after
a socket connection is broken.)
*/
bool isConnected () const;
/**
@return TRUE if isConnected() is true AND this is not a local (like
KMessageDirect) connection.
*/
bool isNetwork () const;
/**
@return 0 if isConnected() is FALSE, otherwise the port number this client is
connected to. See also KMessageIO::peerPort and TQSocket::peerPort.
@since 3.2
*/
TQ_UINT16 peerPort () const;
/**
@since 3.2
@return "localhost" if isConnected() is FALSE, otherwise the hostname this client is
connected to. See also KMessageIO::peerName() and TQSocket::peerName().
*/
TQString peerName() const;
/**
Sends a message to the KMessageServer. If we are not yet connected to one, nothing
happens.
Use this method to send a low level command to the server. It has to be in the
format specified in KMessageServer.
If you want to send messages to other clients, you should use sendBroadcast()
and sendForward().
@param msg The message to be sent to the server. Must be in the format specified in KMessageServer.
*/
void sendServerMessage (const TQByteArray &msg);
/**
Sends a message to all the clients connected to the server, including ourself.
The message consists of an arbitrary block of data with arbitrary length.
All the clients will receive an exact copy of this block of data, which will be
processed in their processBroadcast() method.
@param msg The message to be sent to the clients
*/
//AB: processBroadcast doesn't exist!! is processIncomingMessage meant?
void sendBroadcast (const TQByteArray &msg);
/**
Sends a message to all the clients in a list.
The message consists of an arbitrary block of data with arbitrary length.
All clients will receive an exact copy of this block of data, which will be
processed in their processForward() method.
If the list contains client IDs that are not defined, they are ignored. If
it contains an ID several times, that client will receive the message several
times.
To send a message to the admin of the KMessageServer, you can use 0 as clientID,
instead of using the real client ID.
@param msg The message to be sent to the clients
@param clients A list of clients the message should be sent to
*/
//AB: processForward doesn't exist!! is processIncomingMessage meant?
void sendForward (const TQByteArray &msg, const TQValueList <TQ_UINT32> &clients);
/**
Sends a message to a single client. This is a convenieance method. It calls
sendForward (const TQByteArray &msg, const TQValueList &ltTQ_UINT32> &clients)
with a list containing only one client ID.
To send a message to the admin of the KMessageServer, you can use 0 as clientID,
instead of using the real client ID.
@param msg The message to be sent to the client
@param client The id of the client the message shall be sent to
*/
void sendForward (const TQByteArray &msg, TQ_UINT32 client);
/**
Once this function is called no message will be received anymore.
processIncomingMessage() gets delayed until unlock() is called.
Note that all messages are still received, but their delivery (like
broadcastReceived()) get delayed only.
*/
void lock();
/**
Deliver every message that was delayed by lock() and actually deliver
all messages that get received from now on.
*/
void unlock();
/**
@return The number of messages that got delayed since lock() was called
*/
unsigned int delayedMessageCount() const;
signals:
/**
This signal is emitted when the client receives a broadcast message from the
KMessageServer, sent by another client. Connect to this signal to analyse the
received message and do the right reaction.
senderID contains the ID of the client that sent the broadcast message. You can
use this e.g. to send a reply message to only that client. Or you can use it
to ignore broadcast messages that were sent by yourself:
\code
void myObject::myBroadcastSlot (const TQByteArray &msg, TQ_UINT32 senderID)
{
if (senderID == ((KMessageClient *)sender())->id())
return;
...
}
\endcode
@param msg The message that has been sent to us
@param senderID The ID of the client which sent the message
*/
void broadcastReceived (const TQByteArray &msg, TQ_UINT32 senderID);
/**
This signal is emitted when the client receives a forward message from the
KMessageServer, sent by another client. Connect to this signal to analyse the
received message and do the right reaction.
senderID contains the ID of the client that sent the broadcast message. You can
use this e.g. to send a reply message to only that client.
receivers contains the list of the clients that got the message. (If this list
only contains one number, this will be your client ID, and it was exclusivly
sent to you.)
If you don't want to distinguish between broadcast and forward messages and
treat them the same, you can connect forwardReceived signal to the
broadcastReceived signal. (Yes, that's possible! You can connect a TQt signal to
a TQt signal, and the second one can have less parameters.)
\code
KMessageClient *client = new KMessageClient ();
connect (client, TQT_SIGNAL (forwardReceived (const TQByteArray &, TQ_UINT32, const TQValueList <TQ_UINT32>&)),
client, TQT_SIGNAL (broadcastReceived (const TQByteArray &, TQ_UINT32)));
\endcode
Then connect the broadcast signal to your slot that analyzes the message.
@param msg The message that has been sent to us
@param senderID The ID of the client which sent the message
@param receivers All clients which receive this message
*/
void forwardReceived (const TQByteArray &msg, TQ_UINT32 senderID, const TQValueList <TQ_UINT32> &receivers);
/**
This signal is emitted when the connection to the KMessageServer is broken.
Reasons for this can be: a network error, a server breakdown, or you were just kicked
from the server.
When this signal is sent, the connection is already lost and the client is unconnected.
You can connect to another server by calling setServer() afterwards. But keep in mind that
some important messages might have vanished.
*/
void connectionBroken ();
/**
This signal is emitted right before the client disconnects. It can be used
to this store the id of the client which is about to be lost.
*/
void aboutToDisconnect(TQ_UINT32 id);
/**
This signal is emitted when this client becomes the admin client or when it loses
the admin client status. Connect to this signal if you have to do any initialization
or cleanup.
@param isAdmin Whether we are now admin or not
*/
void adminStatusChanged (bool isAdmin);
/**
This signal is emitted when another client has connected
to the server. Connect to this method if that clients needs initialization.
This should usually only be done in one client, e.g. the admin client.
@param clientID The ID of the client that has newly connectd.
*/
void eventClientConnected (TQ_UINT32 clientID);
/**
This signal is emitted when the server has lost the
connection to one of the clients (This could be because of a bad internet connection
or because the client disconnected on purpose).
@param clientID The ID of the client that has disconnected
@param broken true if it was disconnected because of a network error
*/
void eventClientDisconnected (TQ_UINT32 clientID, bool broken);
/**
This signal is emitted on every message that came from the server. You can connect to this
signal to see the messages directly. They are in the format specified in KMessageServer.
@param msg The message that has been sent to us
@param unknown True when KMessageClient didn't recognize the message, i.e. it contained an unknown
message ID. If you want to add additional message types to the client, connect to this signal,
and if unknown is true, analyse the message by yourself. If you recognized the message,
set unknown to false (Otherwise a debug message will be printed).
*/
//AB: maybe add a setNoEmit() so that the other signals can be deactivated?
//Could be a performance benefit (note: KMessageClient is a time critical
//class!!!)
void serverMessageReceived (const TQByteArray &msg, bool &unknown);
protected:
/**
This slot is called from processIncomingMessage or
processFirstMessage, depending on whether the client is locked or a delayed
message is still here (see lock)
It processes the message and analyses it. If it is a broadcast or a forward message from
another client, it emits the signal processBroadcast or processForward accordingly.
If you want to treat additional server messages, you can overwrite this method. Don't
forget to call processIncomingMessage of your superclass!
At the moment, the following server messages are interpreted:
MSG_BROADCAST, MSG_FORWARD, ANS_CLIENT_ID, ANS_ADMIN_ID, ANS_CLIENT_LIST
@param msg The incoming message
*/
virtual void processMessage (const TQByteArray& msg);
protected slots:
/**
This slot is called from the signal KMessageIO::received whenever a message from the
KMessageServer arrives.
It processes the message and analyses it. If it is a broadcast or a forward message from
another client, it emits the signal processBroadcast or processForward accordingly.
If you want to treat additional server messages, you can overwrite this method. Don't
forget to call processIncomingMessage() of your superclass!
At the moment, the following server messages are interpreted:
MSG_BROADCAST, MSG_FORWARD, ANS_CLIENT_ID, ANS_ADMIN_ID, ANS_CLIENT_LIST
@param msg The incoming message
*/
virtual void processIncomingMessage (const TQByteArray &msg);
/**
Called from unlock() (using TQTimer::singleShot) until all delayed
messages are delivered.
*/
void processFirstMessage();
/**
This slot is called from the signal KMessageIO::connectionBroken.
It deletes the internal KMessageIO object, and resets the client to default
values. To connect again to another server, use setServer.
*/
virtual void removeBrokenConnection ();
void removeBrokenConnection2 ();
private:
KMessageClientPrivate *d;
};
#endif