Comprised of both server and client components
Hello all
We all consult an open source project and download freely the source code and the documentation for the server as a tarball. The well known open source project is Paragent which its platform is comprised of both server and client components written in Lisp, C++ and Java. just take a look and drop your suggestions.
Thanks for any help,
Bmora96
Huh?
Similar Messages
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Try to use one comupter as both server and client
Hello, everyone, I am just trying to use my own computer as both server and client to test some codes about networking. For example, use the sample code in java tutorial which is used to test Echo server(code is listed below). Is there anything I have to do to set my computer, such as set my hostname or something like that?
I am a pure newbie. And the purpose of this question is to test some code including socket on one PC without connect to internet.
I have tried to change the name "taranis" in the following code to the computer name of my own PC, but it doesn't work, and said: Couldn't get I/O for the connection to: (my computer name).
import java.io.*;
import java.net.*;
public class EchoClient {
public static void main(String[] args) throws IOException {
Socket echoSocket = null;
PrintWriter out = null;
BufferedReader in = null;
try {
echoSocket = new Socket("taranis", 7);
out = new PrintWriter(echoSocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(
echoSocket.getInputStream()));
} catch (UnknownHostException e) {
System.err.println("Don't know about host: taranis.");
System.exit(1);
} catch (IOException e) {
System.err.println("Couldn't get I/O for "
+ "the connection to: taranis.");
System.exit(1);
BufferedReader stdIn = new BufferedReader(
new InputStreamReader(System.in));
String userInput;
while ((userInput = stdIn.readLine()) != null) {
out.println(userInput);
System.out.println("echo: " + in.readLine());
out.close();
in.close();
stdIn.close();
echoSocket.close();Did you write the EchoServer and start it on your
machine, listening on port 7?
You can have the client and server running on the same
machine or different machines, but they have to be
separate pieces of software.
Write a separate EchoServer class that starts up and
listens on that port. Then start the EchoClient and
make the connection.
%yeah, I didn't wrote the EchoServer class. But I thought it is automaticly included and therefore has run once I start my computer.
If I write a EchoServer class, then how should I set the host name of the EchoClient, just simply change "taranis" to my computer name (change "echoSocket = new Socket("taranis", 7);" to echoSocket = new Socket("(my comptuer name)", 7);"? -
How can a VI be both server and client?
Hi,
I'm new in LabView and I'm trying to build a server and client VI using TCP/IP that runs in two computers. in my program I need both server and client VIs to communicate with each other which means I need both VIs to be server and client. I've tried using a case structure but it doesnt work. The only thing I achieved is a normal server/client system where the server sends a request and the client responses.But i need the client to send requests too.i have attached my VIs to this post.I would appriciate it if someone could help with this problem.
Thanks in advanced.
Rambaldi.
Solved!
Go to Solution.
Attachments:
Server-Client.zip 41 KBDo you really need a client and server on each PC? If you simply need that two to talk to each other they can once the client connects to the server. In most cases you only need one server.
What Steve said about the not using the same port only applies to two servers on the same machine. A client must use the port the server is listening to and if the client and the server are on the same machine then they will both use the same port. However, only ONE of them is accepting waiting for connections on that port.
In the code you posted you actually swapped the names. What you call the client is actually the server code and vise versa. In networking a server is an application that listens to an assigned port, accepts connections on that port and provides whatever services it has implemented. A client is an application that establishs a connection to a server. Once a connection is established the two applications can communicate in both directions. The applications themselves will define how the conversation should progress and whether it is a one way conversation or a two way conversation. You don't specify what you are trying to accomplish but I suspect you only need a single server.
In TCP, every connection is defined by the source and destination IP addresses and the source and destination ports. The server uses a known port (FTP is port 21, HTTP is 80, telnet is 23, or some custom port in the user space beyonds the reserved ports) to listen for connections. The client will use the well known port of teh server and generally picks a random port for its port number. The LabVIEW VIs do this automatically. This is how a server and a client on the same computer can use the same port number. Two servers however cannot. The server application can spawn a child task allowing it to service multiple connections at one time though. Each connection will be unique though since the client's port number, address or both will change for each connection.
OK, end of networking 101.
Can you describe in a bit more detail what exactly you want to accomplish. Given that I could probably provide you with more information for your application.
Mark Yedinak
"Does anyone know where the love of God goes when the waves turn the minutes to hours?"
Wreck of the Edmund Fitzgerald - Gordon Lightfoot -
JAX-RPC: Web service where both server /and/ client are services?
I'm considering a two-way Web service in an application that I'm designing and would appreciate any insight from prior experience.
This will be a standard client-server application, where the server broadcasts messages and the client, in turn, can request further information about the messages that it receives (think RSS-style updates, but with more interaction). [strong]However[strong], instead of having the client poll the server for new messages, I'd like to have the client register itself with the server as a message listener. The server is currently implemented as a Web service on port X. I'd like the client to register itself with the server, and then receive messages on port Y.
I'm considering a design like the following (note the directions of the inheritance arrows):
( Server class ) --<-- ( RemoteServerImpl class ) -->-- / RemoteServer interface /
|
( Listener class ) --<-- ( RemoteListenerImpl class ) -->-- / RemoteListener interface /Some considerations:
* In both cases, the client and server are broken out into an interface and two classes. The non-Remote classes implement all of the functionality. The RemoteX interfaces declare the methods that will be exposed via RPC, and the RemoteXImpl classes are empty subclasses of the non-Remote classes.
* In order to register itself with the Server, the Listener must be passed in as a method parameter, and thus conform to the JAX-RPC specification for value types. However, value types can't implement java.rmi.Remote.
* Only the Server and Listener know anything about each other.
* This application can be run either remotely or locally, depending on how the Server and Listener are instantiated. For the latter, they're instantiated directly and the listener is registered with the Server. For the latter, the RemoteX interfaces will point to the service stubs.
* I don't see an easy way to allow both the Server and the Listener to have references to each other (at least now without some casting magic), since one of them will have to conform to the value type specification, which requires that all of its fields must be valid JAX-RPC types.
I've got the Server portions implemented and working, and am now going to turn to the Listener stuff. Can anybody see a fundamental problem with this design, or can suggest something better?Hi There,
Because web services are fundamentally a Services-oriented architecture, and not an Object-oriented one, you are unable to pass objects by reference (only by value) hence the design decision to not allow rmi.Remote objects to be sent across the wire. The best way would be to abstract an object which does itself not represent a server, but a route to a server (lets call it ServerPointer). This must contain address, port, service info, etc.
Now, in your Server class, create a factory method which takes a ServerPointer, and returns a reference to a
remote server, e.g. protected Server createServer( ServerPointer p ) (using the necessary APIs to get such a reference)
Hope this helps... -
MultiThreaded Server and Client connections query.
I have written a MultiThreaded Server to accept incoming client requests.
Multiple clients can connnect to this server and have a conversation.
I invoke the 'MultiServer' from the command line and then invoke 3 clients
from the command line.('Client').
c:> java MultiServer
c:> java Client
c:> java Client
c:> java Client
All the 3 clients now run in their own thread and send messages
to the server.
The problem I am facing is this:
When client1 connects to the server and sends a message to the server (with the server responding)
it works fine.Both Server and Client can exchange messages.
When client2 connects to the server and sends a message and when the server
responds with a message,the message does NOT go to client2,but goes to Client1
As Clients have their own thread to run,shouldnt the messages also be delivered to
individual clients
Am I missing something?
My Code
public class MultiServer {
public static void main(String[] args) throws IOException {
ServerSocket serverSocket = null;
boolean listening = true;
try {
serverSocket = new ServerSocket(4444);
System.out.println("MultiServer listening on Port 4444");
} catch (IOException e) {
System.err.println("Could not listen on port: 4444.");
System.exit(-1);
// Indefinite Loop.
while (listening)
new MultiServerThread(serverSocket.accept()).start();
serverSocket.close();
public class MultiServerThread extends Thread {
private Socket socket = null;
public MultiServerThread(Socket socket) {
super("MultiServerThread");
this.socket = socket;
public void run() {
try {
PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
BufferedReader in = new BufferedReader(
new InputStreamReader(
socket.getInputStream()));
BufferedReader stdInFromServer = new BufferedReader(new InputStreamReader(System.in));
String fromTheClient,fromServer;
fromServer = "Hi Client,How u doing? ";
// Send a message from the Server.
out.println(fromServer);
while ((fromTheClient = in.readLine()) != null) {
if (fromTheClient.equals("ByeServer"))
break;
// Display message received from Client.
System.out.print("Client Response : ");
System.out.println(fromTheClient);
// Input reply from the Server.
fromServer = stdInFromServer.readLine();
out.println(fromServer);
if (fromServer.equals("Bye."))
break;
out.close();
in.close();
socket.close();
} catch (IOException e) {
e.printStackTrace();
Client Code
===========
public class Client {
public static void main(String[] args) throws IOException {
Socket kkSocket = null;
PrintWriter out = null;
BufferedReader in = null;
try {
kkSocket = new Socket("localhost", 4444);
out = new PrintWriter(kkSocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(kkSocket.getInputStream()));
} catch (UnknownHostException e) {
System.err.println("Don't know about host: localhost.");
System.exit(1);
} catch (IOException e) {
System.err.println("Couldn't get I/O for the connection to: localhost.");
System.exit(1);
BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
String fromServer;
String fromUser;
while ((fromServer = in.readLine()) != null) {
System.out.println("Server: " + fromServer);
if (fromServer.equals("Bye."))
break;
fromUser = stdIn.readLine();
if (fromUser != null) {
out.println(fromUser);
out.close();
in.close();
stdIn.close();
kkSocket.close();
}Taking standard input for multiple threads from one console is quite unpredictable. I think the first client thread is waiting for input when you connect the second. You type something into your server window and since the first thread was waiting for input, it takes the input and sends it to client 1.
-
UDP server and client running on same machine
Hi all,
I can't get the QuoteServer example to work. I am trying to run both server and client on same machine since I only have one machin available at the moment.
I am using win xp behind a firewall. Anything that might interfere?
With some System outs I can see that the server is waiting for request but never getting any...Restarted computer and now it works. Are ports locked up if I get an exception in the 'wrong' place?
-
LDAP (Directory service) server and client compatiblw with windows 7
Hello Experts,
Earlier we were using Netscape Server 4.0 and Console in Windows XP for LDAP Integration testing with BRM.
Now that Windows XP is soon going to be decommissioned and the software is incompatible with windows 7,I am looking for Directory service (both server and client) alternatives compatible with Windows 7.
Has anyone tried setting up a Directory service(or LDAP) in windows 7 Operating system ??
Any help is appreciated. Thank youHello Mr Thio,
Basic cause for this type of error message is Generally permission issue.If you are using a domain account make sure it is added as local administrator in local machine.
RK on setup.exe and select run as administrator
Makes sure you copy installables on local drive and run setup from machine if your are running from CD directly avoid it.
Below MS link has documented this error please go through the link properly
http://support.microsoft.com/kb/2799534
Please mark this reply as the answer or vote as helpful, as appropriate, to make it useful for other readers -
Can I put both RMI server and client in a same program
hi everybody...
I wanna know that can I use RMI server and client in a same program....My idea is like that I wanna use the same program for client and server....When I open my program, I can accept connection from other program and if I want to connect to others, I can also connect it. I expect you to understand my question. Here are the sample code for my program...
package Chat.Rmi;
import java.lang.*;
import java.util.*;
import java.rmi.*;
import javax.swing.*;
import java.net.*;
import java.rmi.server.*;
import java.rmi.registry.*;
public class netKitManager implements netKitInterface{
public netKitManager(){
try{
reg = LocateRegistry.createRegistry(4242);
reg.rebind("NetKitServer",this);
}catch(RemoteException re){
public void DirectConnect(String ip){
try{
netUser = (netKitInterface) Naming.lookup("rmi://"+ip+":4242/NetKitServer");
JOptionPane.showMessageDialog(null,"Connection succeded!");
}catch(NotBoundException nbe){
JOptionPane.showMessageDialog(null,"There is no server at specified IP address!");
}catch(MalformedURLException mue){
JOptionPane.showMessageDialog(null,"IP adress may be wrong!");
}catch(RemoteException re){
JOptionPane.showMessageDialog(null,"Remote exception occured!");
public void SendMessage(String msg){
try{
netUser.SetMessage(msg);
}catch(RemoteException re){
public void SetMessage(String msg) throws RemoteException{
chatKit.SetMessage(msg);
private netKitInterface netUser;
private Hashtable netUserList;
private Registry reg;
}Yes it can be done. I have done it.
-
Connection fails if server and clients are in different subnets
Hello,
our Volume License Manager (v2.1) is running in another subnets than the clients (All machines are running under Windows XP-SP2 without Domains or ADS, just workgroups).
The server is in subnet A (192.168.42.0/24), all clients are located in another subnet B (192.168.50.0/24).
Routing is properly configured and is working fine, traffic to the specific hosts is not blocked by a firewall. We can ping every machine,
open telnet connections to the NILM, everything works.
But if the clients try to connect to the remote NILM (both local client NI License Manager and VLM port settings are correct) their connection attempt always
times out with error code "NILM10"
(I already read the mentioned KBs, no solution has helped so far). This is true if clients and server are separated.
For testing purposes, i plugged one client into the server's subnet (server's IP: 192.168.50.250, client 192.168.50.10)
and it worked perfectly. Is there a reason why server and client have to be on the same subnet or is it some other kind of problem that I am not aware of?
Thank you.
ThorstenHello Thorsten,
Did you add the server's domain to the client computer's DNS settings. To do this, complete the following steps on the client computer:
1. Open Local Area Network Settings from the Control Panel (Start»Control Panel»Network Connections»Local Area Connection)
2. Click the Properties button
3. Select Internet Protocol (TCP/IP) from the list of network components
4. Click the Properties button
5. Click the Advanced button
6. Change to the DNS tab
7. Ensure Append these DNS suffixes is selected
8. Click the Add button
9. Enter the domain suffix of the license server and click Add
10. Close any open dialog boxes, choosing OK and Close as necessary.
(http://digital.ni.com/public.nsf/allkb/3AAF37CD7B89A2CD86257070005A075A?OpenDocument)
Further you should check this KBs.
Why is My NI License Manager Slow or Not Responsive with a Configured Network Server on Another Domain?
http://digital.ni.com/public.nsf/allkb/27D6BD8116EF257A862572F2005C2181?OpenDocument
How Can I Access NI Volume License Manager from a Different Network or Behind a Firewall?
http://digital.ni.com/public.nsf/websearch/54E52C3F348B929786256DCD0056B19B?OpenDocument
Regards,
WolfgangZ -
Time sync between server and client
Hi guys,
I have written a chess server and client. My next step is to implement a clock which will be used in timed games, however, I am not sure of the best solution. I can't think of a reliable method to keep the client's time in sync with the servers because the event latency varies between individual events and clients.
My first idea was to send a 'tick' event every second but I dont think this the best solution. I have seen many applet based clients which have timers, such as Yahoo chess.
I know this question is a little vague, I can give more detail if needed.
Thanks,
AlexTo prevent client-side cheating, the server should keep the
"official" clock. Every so often (perhaps when a move gets made?),
notify both clients of the official time. Clients count seconds from
that official time.
This is a suboptimal solution because it leaves clients vulnerable
to network lag. I can't think of any other solution that doesn't give
clients some responsibility for tracking time, though, and that's a
big security hole.
If you're willing to open that hole, have each client report back to
the server the elapsed local time from when they recieved the
last move to when they made their move. Then update the other
client's clock accordingly. -
VTP server and client setup in multiple switches
I understand that we need to setup 1 vtp server and client to exchange trunking messages, to advertise and to updates. But when I have 4 switches connected in square formation, which 1 should I choose to become Server? Another senario, if I have distribution and core layer switches, where I should place my VTP server switch?
Thanks.Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Not sure about VTPv3, but with earlier VTP versions, the only major difference between VTP servers and clients is, servers allow you to configure VLAN changes. Both exchange VLAN database information with their immediate neighbors. The real advantage of only having one VTP server configured, it avoids two people configuring two VTP servers at the same time, and creating an update conflict between them. (NB: if you lose your only VTP server, you can promote a client to be a server.) -
9i installation (network problem b'n server and client
Hi
I installed 9i in windows 2003 server and client system (win xp). I configured listener.ora file in server and tns.ora file in client mechine. while trying to ping (i.e tnsping) i m getting follwoing errors in both systems.
C:\>tnsping tns_tekhub3
TNS Ping Utility for 32-bit Windows: Version 9.2.0.1.0 - Production on 13-DEC-20
06 11:28:25
Copyright (c) 1997 Oracle Corporation. All rights reserved.
Used parameter files:
f:\Orahome92\network\admin\sqlnet.ora
TNS-03505: Failed to resolve name
C:\>Hi,
i made chages in sqlnet.ora file.
C:\>lsnrctl services
LSNRCTL for 32-bit Windows: Version 9.2.0.1.0 - Production on 14-DEC-2006 09:23:
04
Copyright (c) 1991, 2002, Oracle Corporation. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
Services Summary...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:0 refused:0
LOCAL SERVER
Service "tekhub" has 2 instance(s).
Instance "tekhub", status UNKNOWN, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:0 refused:0
LOCAL SERVER
Instance "tekhub", status READY, has 1 handler(s) for this service...
Handler(s):
"DEDICATED" established:1 refused:0 state:ready
LOCAL SERVER
Service "tekhubXDB" has 1 instance(s).
Instance "tekhub", status READY, has 1 handler(s) for this service...
Handler(s):
"D000" established:0 refused:0 current:0 max:1002 state:ready
DISPATCHER <machine: SERVER, pid: 3684>
(ADDRESS=(PROTOCOL=tcp)(HOST=server)(PORT=1064))
The command completed successfully -
I am using server and clients machines in my office, here i want to open browsers in all systems simultaneously but i am unable open the browser, when i am trying to open the browser in the second machine it says that firefox is already open... pls. solve this problem
Thank youYou can't open one Profile more than once. You need a separate Profile for each browser on each PC that you open.
https://support.mozilla.com/en-US/kb/Profiles -
Force CORBA server and client to localhost
Hi,
i have to run an omg corba server and client via orbd on a single machine with win xp. The machine is connected to the network, but this is not relevant for the corba communication.
I can now force the orbd to start at localhost. After starting server and client everything works well until disconnecting machine from network, because client and server are started at ip of network card.
How can i force the client and server to use a localhost port for corba communication (client and server)?
Hope anyone has an idea...
br
ralf
P.S.: If I start the applications after disconnecting network everthing works.Resolved the problem myself.
The correct property is a java system property:
com.sun.CORBA.ORBServerHost=localhost
If you set this property in your application before instanciating an ORB, the orb will be forced to run on the set value (in this case localhost). If you do not set this property the ORB will be started at the IP of your network card if it is active (connected to the network)... -
Data streaming between server and client does not complete
Using an ad-hoc app, data streaming between server
and client does not complete as it supposed to be.
The process runs well in solaris 5.8, however under 5.9
we have found the characters stream buffer length limitation
is around 900 to 950 characters (by default we are using 3072
characters).
Example:
- We are transfering HTML file, which will be displayed
in the App client, with buffer=3072, the HTML only displayed / transfered
as xxxxxxxx characters, but with buffer=900 the HTML is displayed properly,
in this case, the only problem that we have is the file transfer will
eventually longer than usual.
- There is another case, where we have to transfer information (data) as stream
to the client. A long data stream will not appear at all in the client.
Any ideas why the change between 5.8 and 5.9 woudl cause problems?
The current app-driver that we are using is compiled using Solaris 5.6,
if possible we would like to have use of a later version, which is compiled using Solaris 5.9, do you think this will probably solve our problem?
Thanks
PaulDoes this have anything to do with Java RMI? or with Java come to think of it?
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