Purpose of Multiple Clients in Development Server

can anybody tell me the advantages and
disadvantages of having multiple clients in a
development server?

I don't think there is disadvantage when we have multiple clients for development system
DEV SAP system may have multiple clients..
Main pupose : Changes can be client dependent or client independent
Client-independent effects some clients.
Client-dependent effects all clients.
Let me say one example : Dev system has two clients
100 - Here we can write the code
200 - Testing will be here ( customizing will done here)
http://help.sap.com/saphelp_nw04/helpdata/en/8d/933d3c3a926614e10000000a11402f/frameset.htm
http://www.sap-img.com/general/what-is-sap--landscape.htm
http://help.sap.com/saphelp_nw2004s/helpdata/en/96/8a99386185c064e10000009b38f8cf/content.htm
Thanks
Seshu

Similar Messages

Multiple clients in Developement system for Charm

Hi Solman experts,
We are planning for the Charm implementation and we have multiple clients in Developement system.
Major hurdle is how to keep all the development clients in sync.
we have following clients
100 Golden client
300 configuration client
400 ABAP Developement client
500 Unit test
600 HR1
700 HR 2 clients
All configurations will be made in Client 300 and transported to QA and all developements will be made in client 400
Transports released from 300 and 400 should go all other clients.
Solman experts could anyone advice whether this is can be done using charm.
regards
Naveen

Hello Naveen,
Please, check the point 1 of the following link:
/people/dolores.correa/blog/2009/07/22/change-request-management-scenario-usual-questions-and-known-errors
I think that this link can answer your question.
Best Regards,
Diego Fischer

Saving string from multiple clients on a server data structue

I have a server which receives updates from multiple clients ( in this example, football scores which are updated periodically by the clients.)
When the server receives the scores it needs to store them and at certain time intervals send the complete list of scores to multiple terminals at various locations.
I am approaching this task in stages...
stage 1.
..create the clients and server ...test the clients can send the data and the server can receive the data and output to screen..
this is completed
stage 2...
a/ on the server side store the received scores in a data structure (ArrayList<String> is what I'm thinking.)
b/ periodically output all scores to the screen (maybe every 30 seconds) and empty the ArrayList..am looking at the Timer class for this part..
stage 3
create the monitors and output scores to monitors periodically..
======================================================
right now I'm at stage 2a ie trying to store the received scores in a data structure.
i've created a method saveScore in the StoreScore class which is called by the StoreScore run method...
The saveScore method creates an ArrayList and adds the score to it...
Question
does every thread create a new instance of storedScores and therefore the scores are stored in a multitude of data structures?
I think the answer is yes and if so then this is not the solution...
What I'm thinking is , as all scores can be outputted to the server screen via System.out.println, is there not a way of saving all these scores in a single data structure?
The code below is the server code..
any advice much appreciated....thank you
/*=============================================================== */
import java.io.*;
import java.net.*;
import java.util.*;
import java.util.concurrent.*;
class ScoresServer1{
final static int portNum = 1234; // any number > 1024
final static int numThreads = 10;
static ExecutorService pool;
public static void main(String[] args){
pool = Executors.newFixedThreadPool(numThreads);
System.out.println("Server running ...");
try{
ServerSocket servesock = new ServerSocket(portNum);
// for service requests on port
while (true){
// wait for a service request on port portNum
Socket socket = servesock.accept();
// submit request to pool
pool.submit(new StoreScore(socket));
}catch(IOException e){}
class StoreScore implements Runnable {
BufferedReader reader;
Socket sock;
public StoreScore(Socket clientSOcket) {
try {
sock = clientSOcket;
InputStreamReader isReader = new InputStreamReader(sock.getInputStream());
reader = new BufferedReader(isReader);
} catch (Exception ex) { ex.printStackTrace(); }
public void run() {
String message;
try {
while ((message = reader.readLine()) != null) {
// System.out.println("latest score: " + message);
saveScore(message);
} catch (Exception ex) { ex.printStackTrace(); }
public void saveScore(String message){
     ArrayList<String> storedScores = new ArrayList<String>();
     storedScores.add(message);
     Iterator<String> t = storedScores.iterator();
          while(t.hasNext()){
               String s = t.next();
               System.out.println(s);
}

does every thread create a new instance of storedScores and therefore the scores are stored in a multitude of data structures?
I think the answer is yes and if so then this is not the solution...The answer is yes. However, threads can share data, if they were properly synchronized. You should read the threading tutorial before creating a lot of hard to debug mistakes.
[http://java.sun.com/docs/books/tutorial/essential/concurrency/]

Send data to multiple clients from a server

My problem statement is this:
A server is created, say X. Multiple clients are created, say A, B & C. If X sends a message to A it should reach only A and should not go to B or C. Similarly if X sends message to B it should not reach A or C. I made a one to one communication with the following code:
//Server
import java.io.*;
import java.net.*;
class X
public static void main(String args[])throws Exception
ServerSocket ss=new ServerSocket(4321);
try
Socket s=ss.accept();
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
DataOutputStream out = new DataOutputStream(s.getOutputStream());
String str=in.readLine();
out.writeBytes(str+"\n");
s.close();
ss.close();
catch (IOException e){}
//Client A
import java.io.*;
import java.net.*;
class A
public static void main(String args[])throws Exception
try
Socket s=new Socket("localhost",4321);
BufferedReader in=new BufferedReader(new InputStreamReader(s.getInputStream()));
System.out.println(in.readLine());
s.close();
catch(Exception e){}
}But i dont know how to keep track of each client. Because all the clients sockets are created at the same port, ie. 4321. I think thread will help. But even then i dont know how to identify each client. Somebody please help. Thanks in advance.
Edited by: sowndar on Dec 5, 2009 1:21 AM

YoungWinston wrote:
sowndar wrote:
Ok. I think i have to attach an unique ID to each client message. So that, with the help of that ID, the server can identify each client. Have i caught ur point?If you don't mind using a port per client, you could do something like a receptionist taking incoming calls (on 4321 only).
- Hi I'm Client xyz.
- Hi Client xyz, please call me back on port abcd and I'll put you straight through to our server.
Since 4321 is an "open line" you might have to have some sort of ID so that Clients know which return messages are meant for them, but messages on the other ports would all be direct Client to Server. Also, the Server is then is charge of port allocation and communication on the "open" port is kept to a minimum.4321 is the socket that the server is listening to. It's not what the actual communication will be carried out over. Run this, then telnet to port 12345 a few times
public class TestServerSocket {
public static void main(String[] args) throws Exception {
          ServerSocket server = new ServerSocket(12345);
          while (true) {
               Socket socket = server.accept();
               System.err.println(socket.getPort());
}Notice how each inbound connection is allocated a unique outbound socket.

Transfer configured objects from one client of development server to anothe

hi friends ,
i configured an object e.g. sales area in development server e.g 400 client, now i want to transfer it to client 410 of the same server. how to do it?
thanks
Sk

Hi,
within the same server you can moved the configs with SCC1 transaction. Consult your basis for the process involved to move requests.
regards
sadhu kishore

Client creation on XI on development server for Quality

Dear All ,
I have configured scenarios on one of the client in development server . <b>I want to create new client for quality/Testing on the same development server</b> .Can somebody guide us how to create new client on the same server .
Thanks in advance
Regards
Prabhat

My question was meant to determine whether you had any CPU licenses. In retrospect, it doesn't matter.
You cannot use your Production licenses on your Dev system without violating your contractual obligations with SAP. i.e. both system cannot run in parallel using the same license keys.
You might be able to use the quarterly Test licenses that SAP makes available without violating your contract. I am uncertain of the terms of the test licenses.
You should probably talk to your Account Manager on this.

Multiple clients with RMI

Hi all,
I'm quite new to developing RMI applications. I have to develop a card game where 4 players can play. How can i connect multiple clients to the server at the same tile. I have to give unique identities to each client. How can I do this..???
Thanks for any reply!!

That sounds like an idea. But I am really new to RMI, so do you have an example that i can go from or is there already some similar in the forum u know about ?

Support multiple clients.

hi, all
I have some ideas on it and want to see if it makes sense. May you share your experience/expertize? thx in advance.
The target is to support multiple clients in one server. It uses TCP socket. The design choices are:
1. Uses one ServerSocket for one client. starts a new thread for each ServerSocket.
2. Uses one ServerSocket for all clients. everytime accept() returns, starts a new thread for this client.
I think #2 is better since it uses one port number and less resources.
Any ideas?
thx
Tim

You're welcome. I posted an example on a Multithreaded Server that does this, it actually uses two threads per client to provide full duplex support.

Controlling Multiples Clients

Hi, i trying to know if i can manage multiple clients on a RMI Server, i think yes (with threads?)
The server have to mantain multiples rooms, and each room can have from 2 to 10 clients (people). The server have to mantain about 1 to 20 rooms of this rooms and all the clients, and 1 expecific client like an administrator client.
Abour the people client i think i can make an applet or use JWS.
I was asking about use RMI, someone says to me to use EJB or Web Services but i think theres too complicated to my scenario.
Oh...the server have to controll a data base too lol... to much for me and my little english, thanks in advance!

Hi,
I need to know a couple of things.
1. Do I need to use multithreads to an rmi project where multiple clients access the server simultaneously
2. In case I establish that ( or even if RMI has it by default ), do i need to worry about sharing resources for these threads. ( For example, if we have a text file the remote object reads from & writes to , can I make sure there is no clash for accessing it???)

Multiple Clients in BW 3.5 Development Systems?

In a Development BW 3.5 environment, can we have multiple clients? For instance, can we have a unit test client(with master and transactional data), a security client, and a golden configuration client.
We have heard that there may be issues with having more than one client, but we are not sure if this is correct. Our BW unit test client would be the only one of the three that is connected to a R/3 (4.7) Development client. The security and golden config client would not be connected to external systems. Is this landscape possible and supported by SAP?

Rick,
You cannot have more than two clients. A client is a technique used for isolating data records and configuration data which is technically stored in the same database tables into mutually exclusive sets of data. Clients may exists as separate for project or organizational reasons. Most configuration data is generally client independent in SAP operational systems while transactional and master data are usually client specific.
SAP BW Application does not make extensive use of the client concept. Infact with SAP BW all specific application functions can take place in one client. SAP BW does utilize basis clients technically but that is only for systems administration purposes.
Hope it helps.
Thanks
Mona

Multiple client chat server

Thanks to the help I got from the good people of this forum today I modified the chat server program which I am making and now it is working a bit better. Right now it can accept several (up to 8) clients and store their open sockets in a SocketCollection list which can later be accessed so that messages get sent to all of them. Problem is that when I send a message, it is displayed instantaneously on the client that sent that message (my machine), but is displayed only after the other clients press enter on the other clients' machines (for testing purposes it was the same machine, different port opened for communication with server which is also on the same machine). To clarify that - all clients and server are the same machine (that shouldn't be a problem, right?). Code for printing incoming data for client program is below:
while ((fromServer = in.readLine()) != null) {
            if (fromServer!=null){
                   System.out.println(fromServer);
                   System.out.println("print on client screen msg received from server");
            fromUser = stdIn.readLine();
            if (fromUser != null) {
          System.out.println("Client: " + fromUser);
          out.println(fromUser);
}Code to deliver the message to all clients from the server application is below as well:
while ((inputLine = in.readLine()) != null) {
                 PrintWriter multiOut;
               for (int x=0; x<8; x++){
                     System.out.println("INSIDE MULTI-TELL FOR LOOP");
                     if (socketCollection[x]!=null){
                           Socket c=socketCollection[x];
                           try{
                               System.out.println("tried to send to all\nSocket c = " + c);
                               out=new PrintWriter(c.getOutputStream(), true);
                                   out.println(c.getInetAddress() + inputLine);
                            catch(IOException ioe){}
}In the server's DOS window I can clearly see that it enters to display the message to multiple clients and it should send it. The sockets are all different and they point to different ports on different clients' machines. Maybe the problem is just in the client program's code. If you could help me out, it will be greatly appreciated. Thank you very much.

The sockets get created one by one when each client connects. Afterwards when the thread is made, that socket gets copied into the SocketCollection array which can afterwards be accessed in order for the server to distribute the message to all its connected clients.
The for loop in the second code example where it takes SocketCollection[x] and gets its outputStream and all that is where it prints the message and sends it to each client (sends it but it is not displayed on the client side until the client sends a message to the server again). My question is how to make it so the client does not have to send a message in order to see the server message (message to all clients) that was sent before.

Multiple-client, same server, different configurations

Hi experts,
Recently we have got a project of IS-U Electricity where it has been planned that the same server we used for the last project will be used for this upcoming project where the configurations are diffrent from each other but both of them will run together in same development, quality and production servers.
My question is whether we would be able to configure sap as per the requirements for the upcoming project to a particular client whereas the rest of the clients will use old configurations for the existing project in the same server. Will there be any cross-client configuration conflicts?
- Arghya

Arghya:
The answer to this question is unrelated the industry solution. Multiple client scenarios are used in many solutions. Some configuration is client dependent and so would be different in each client; other configuration is client independent and would be used in all clients. That would be part of the analysis to determine if multiple clients or multiple systems is the correct approach.
regards,
bill.

Handle Received data of Multiple TCP clients on TCP Server by displaying them into Datagrid

Hello All,
I have developed a C# based TCP server GUI application which is accepting the data from multiple TCP clients on TCP server.
The data i am receiving from TCP clients is a 32 bit data. In my application multiple TCP client data goes like this:
00012331100025123000124510321562
01112563110002512456012451032125 and so on...
Now i want those data of the TCP clients to be parsed into 4 bits first and display it in 8 columns (32/4=8) of (say) datagrid as each 4 bit represents some characteristics of the TCP client. The same thing
should work for next TCP client on second row of datagrid.
Can you give me some suggestion or an example how to go about this? Any help would be appreciated.
Thank you in advance.
Here is my code for receiving data from multiple TCP clients.
void m_Terminal_MessageRecived(Socket socket, byte[] buffer)
string message = ConvertBytesToString(buffer, buffer.Length);
PublishMessage(listMessages, string.Format("Sockets: {0}", message));
// Send Echo
// m_ServerTerminal.DistributeMessage(buffer);
private string ConvertBytesToString(byte[] bytes, int iRx)
char[] chars = new char[iRx + 1];
System.Text.Decoder d = System.Text.Encoding.UTF8.GetDecoder();
d.GetChars(bytes, 0, iRx, chars, 0);
string szData = new string(chars);
return szData;

Now i want those data of the TCP clients to be parsed into 4 bits first and display it in 8 columns (32/4=8) of (say) datagrid as each 4 bit represents some characteristics of the TCP client. The same thing
should work for next TCP client on second row of datagrid
If mean it's a Windows Forms application and you want to display those bits in a DataGridView control, then please see these threads:
Add row to datagridview
Programmatically add new row to DataGridView
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How to control one server with multiple clients via TCP/IP

I am wanting to control a single server with multiple clients. Only one client would be active at a time, so there would be no conflict. I want to use TCP/IP. So far, I have programmed a cluster that passes data back to the server with no problems. The challenge come in when a second client is added to the mix. I have't been able to figure out how to turn each client on and send the appropriate data and then turn it off so it doesn't keep sending the same data to the server.
Here are the things that I have considered and did some preliminary testing, but don't really know how to impliment:
1. Send a numeric on the front of the cluster packet that tells the server that data is on the way.
2. Send a boolean on the front of the cluster packet to somehow turn the server TCP/IP on.
The problem I have found is that LabVIEW TCP/IP doesn't like to be turned on and off. If it doesn't get the data it expects, it goes into a reset mode and that kills the response time.
Any help?

You should consider implementing a set of simple one-byte commands that can be sent back and forth between the Server and the Clients. You can base all of these ideas off the example in the Example Finder under Networking >> TCP and UDP called Multiple Connections - Server.
You will have two loops in the server VI: one to wait for new connections, and one to send and receive data from the existing connections. For instance, after one of the clients connects, it can request control of the server to send data to it by sending the character "R" for request. Every time the send/receive loop of the Server executes, the first thing it can do is to check all the existing connections to see if any of the clients have sent a control request ("R"). If so, it will create a buffer (array) of control requests. This could be in the form of Connection IDs or indexes in the array for a particular Connection ID. Your choice.
After the Server receives a request for contol, if it is not already under control by another client, then it can send a response to the first client on the control request list. For instance, the server could send the first client a "S" command for send. Note that after the clients send their control request, they should execute a TCP Read and wait indefinitely for the server to respond with the one-byte "S" command. Then, once the client in control is finished sending data to the server, it could send the character "X" telling the Server to release it from control.
The example I mentioned above already does a similar thing. Note how when a client wants to disconnect, they send the letter "Q". You can see this in the Multiple Connections - Client VI. The Server then checks each individual connection to see if it's received this one-byte command, and if it has, it closes the connection to the client. This is what you would want to implement, but instead of having just one command, you'll have to distinguish between a few and build up a buffer of control requests.
Finally, if a client does decide to disconnect in your application, they could send the command "Q" just like the example above. At this point, close the connection and remove that Connection ID from the array of connections. You will also have to handle the case that this client was in the request control waiting line when it disconnected, in which case you need to delete it from that array as well.
This will definitely work for you, but it will take some work. Best of luck!
Jarrod S.
National Instruments

Multiple clients with same account on a single IMAP server

Hi,
I am connecting to a IMAP server using same account but from 2 different machines. From one machine a mark a message as SEEN=FALSE. But on the second machine, the flag will still be TRUE.
Is there any way to co-ordinate between multiple clients so that all the clients are in sync.
Regards,
Nitin.

I was able to resolve the problem using addMessageCountListener and messagesAdded method, as suggested by you.
I am now facing another problem. Whenever a new message is received, code inside messagesAdded method gets executed. Here I am trying to spawn another thread and do some stuff. But this new thread is not starting at all. It goes into some JavaMail:EventQueue and does nothing. What is the concept of EventQueue here? How can I get this new thread executed?
Also will there be synchronization problems in messagesAdded method. Say I received a message and I am processing it in the messagesAdded method. In the mean time another message comes up. How will this behave.

Purpose of Multiple Clients in Development Server

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