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 ?

Similar Messages

How to handle multiple clients with DatagramSocket

I am trying to handle multiple clients with 1 datagramSocket bind to one port (basically I have only one port to use, and I can not use TCP or any other ports). At the server side I have two threads one for receiving packets and buffering them, another for processing the packets in the buffer and sending replies.
I can have multiple clients sending datagramPackets to me and I will have to process the packets and send them to DIFFERENT clients. Ex. Client 1 sends datagramPacket to Server which sends the processed packet to Client 2. Also Client 2 sends a datagramPacket to Server which again processes the packet and sends it to Client1. May have Client 3 and 4 doing the same thing at the same time... and so on...
My root class is creating the datagramSocket(somePort) and two threads (receiver and sender). How can I use the socket that I created in these two threads??
I have done the following and I am getting "java.net.bindexception". When I am sending stuff from Client1 to Client2 everything is fine but when I start sending something from Client2 to Client 1, I get the bindexception... Client 1 is using port 3000, Client 2 is using port 4000.
I really don't have a lot of experience in socket programming so I am not sure if there is a much simpler way to do this. I appreciate all the tips and help that I can get...
Thanks...
class UDP_serv
     static DatagramSocket udpSocket;
     final static int SERVER_PORT     = 2000;
     public static void main(String[] args) throws SocketException
          udpSocket= new DatagramSocket(SERVER_PORT);
          new DataReceiver().start ();
          new DataSender().start ();
     static class DataReceiver extends Thread
          DataReceiver()
               Thread.currentThread().setName("DataReceiver");
          public void run()
               while (true)
                    byte pckt[] = new byte [MaxMsgSize];
                    DatagramPacket dp = new DatagramPacket (pckt, pckt.length);
                    try
                         udpSocket.receive (dp);
                         //PUSH TO RECEIVE BUFFER
                    catch(Exception e)
                         e.printStackTrace();
     static class DataSender extends Thread
          DataSender()
               Thread.currentThread().setName("DataSender");
          public void run()
               while (true)
                    processDataMsg();
      static void processDataMsg()
         DatagramPacket op;
         InetAddress DA = null;
         int DP = 0;
         byte [] outPacket = null;
         // POP FROM RECEIVE BUFFER
         // SOME PROCESSING HERE
         // Set Destination Address (DA)
         // Set Destination Port (DP)
         // DA and DP are the forwarding IP and Port addresses
         // not the addresses original packet was sent from.
         try
          op = new DatagramPacket (outPacket, outPacket.length,DA, DP);
          udpSocket.send(op);
         catch (IOException e)
          e.printStackTrace();
}Also for development and testing purposes, I am running the two clients and the server on the same machine (windows xp-32b) so all of the Destination IP Addresses are 127.0.0.1. and as I said Ports that I am using are 2000, 3000, 4000 (Server, Client1, Client2).

Hmm I have minimized the code and it seems to be working now.
I think I have an error in the header portion of the data I am sending, where I am storing the source IP/Port and destination IP/Port. I think the server in the middle is messing these values up while sending them to the destination Client. Because the destination client actually receives the stuff and sends the reply back to the server, but the reply packet's headers has 0/0 as the dest IP / Port...
Server is giving me java.net.BindException: Cannot assign requested address error when it tries to forward the reply it received from the client2 as the address it is trying to send is 0!
I guess it doesnt just give this error when you try to open two sockets to the same port...
Paul, Thanks for the direction on how to proceed... took me a while get the minimized code but at least figured out the problem. Well still have to make sure that is THE problem though :)
As far as the statics goes how can I change those to non static ones? Where do I make an instance of the top level class that creates the threads? and how do I pass the DatagramSocket to the threads/ if I dont need to pass how do I call or use the datagramSocket I created in the top level class? I mean do I still kinda have it like a global variable on the top?? A very simple example would be much appreciated...
I think these might be really basic questions but I am having a rough time with the hierarchy in java...

Problem using CORBA clients with RMI/EJB servers..!!!???

Hi,
I have a question on using EJB / or RMI servers with CORBA clients using
RMI-IIOP transport, which in theory should work, but in practice has few
glitches.
Basically, I have implemented a very simple server, StockTreader, which
looks up for a symbol and returns a 'Stock' object. In the first example, I
simplified the 'Stock' object to be a mere java.lang.String, so that lookup
would simply return the 'synbol'.
Then I have implemented the above, as an RMI-IIOP server (case 1) and a
CORBA server (case 2) with respective clients, and the pair of
client-servers work fine as long as they are CORBA-to-CORBA and RMI-to-RMI.
But the problem arises when I tried using the RMI server (via IIOP) with the
CORBA client, when the client tries to narrow the object ref obtained from
the naming service into the CORBA idl defined type (StockTrader) it ends up
with a class cast exception.
This is what I did to achieve the above results:
[1] Define an RMI interface StockTrader.java (extending java.rmi.Remote)
with the method,
public String lookup( String symbol) throws RMIException;
[2] Implement the StorckTrader interface (on a PortableRemoteObject derived
class, to make it IIOP compliant), and then the server to register the stock
trader with COS Naming service as follows:
String homeName =....
StockTraderImpl trader =new StockTraderImpl();
System.out.println("binding obj <" homeName ">...");
java.util.Hashtable ht =new java.util.Hashtable();
ht.put("java.naming.factory.initial", args[2]);
ht.put("java.naming.provider.url", args[3]);
Context ctx =new InitialContext(ht);
ctx.rebind(homeName, trader);
[3] Generate the RMI-IIOP skeletons for the Implementation class,
rmic -iiop stock.StockTraderImpl
[4] generate the IDL for the RMI interface,
rmic -idl stock.StockTraderImpl
[5] Generate IDL stubs for the CORBA client,
idlj -v -fclient -emitAll StockTraderImpl.idl
[6] Write the client to use the IDL-defined stock trader,
String serverName =args[0];
String symList =args[1];
StockClient client =new StockClient();
System.out.println("init orb...");
ORB orb =ORB.init(args, null);
System.out.println("resolve init name service...");
org.omg.CORBA.Object objRef
=orb.resolve_initial_references("NameService");
NamingContext naming =NamingContextHelper.narrow(objRef);
... define a naming component etc...
org.omg.CORBA.Object obj =naming.resolve(...);
System.out.println("narrow objRef: " obj.getClass() ": " +obj);
StockTrader trader =StockTraderHelper.narrow(obj);
[7] Compile all the classes using Java 1.2.2
[8] start tnameserv (naming service), then the server to register the RMI
server obj
[9] Run the CORBA client, passing it the COSNaming service ref name (with
which the server obj is registered)
The CORBA client successfully finds the server obj ref in the naming
service, the operation StockTraderHelper.narrow() fails in the segment
below, with a class cast exception:
org.omg.CORBA.Object obj =naming.resolve(...);
StockTrader trader =StockTraderHelper.narrow(obj);
The <obj> returned by naming service turns out to be of the type;
class com.sun.rmi.iiop.CDRInputStream$1
This is of the same type when stock trader object is registered in a CORBA
server (as opposed to an RMI server), but works correctly with no casting
excpetions..
Any ideas / hints very welcome.
thanks in advance,
-hari

On the contrary... all that is being said is that we needed to provide clearer examples/documentation in the 5.1.0 release. There will be no difference between the product as found in the service pack and the product found in the 5.1.1. That is, the only substantive will be that 5.1.1 will also
include the examples.
"<=one way=>" wrote:
With reference to your and other messages, it appears that one should not
expect that WLS RMI-IIOP will work in a complex real-life system, at least
not now. In other words, support for real-life CORBA clients is not an
option in the current release of WLS.
TIA
"Eduardo Ceballos" <[email protected]> wrote in message
news:[email protected]...
We currently publish an IDL example, even though the IDL programmingmodel in Java is completely non-functional, in anticipation of the support
needs for uses who need to use IDL to talk to the Weblogic server,
generically. This example illustrates the simplest connectivity; it does not
address how
to integrate CORBA and EJB, a broad topic, fraught with peril, imo. I'llnote in passing that, to my knowledge, none of the other vendors attempt
this topic either, a point which is telling if all the less happy to hear.
For the record then, what is missing from our distribution wrt RMI-IIOPare a RMI-IIOP example, an EJB-IIOP example, an EJB-C++. In this you are
correct; better examples are forth coming.
Still, I would not call our RMI-IIOP implementation fragile. I would saythat customers have an understandably hard time accepting that the IDL
programming model is busted; busted in the sense that there are no C++
libraries to support the EJB model, and busted in the sense that there is
simply no
support in Java for an IDL interface to an EJB. Weblogic has nothing to doit being busted, although we are trying to help our customers deal with it
in productive ways.
For the moment, what there is is a RMI (over IIOP) programming model, aninherently Java to Java programming model, and true to that, we accept and
dispatch IIOP request into RMI server objects. The way I look at it is this:
it's just a protocol, like HTTP, or JRMP; it's not IDL and it has
practically nothing to do with CORBA.
ST wrote:
Eduardo,
Can you give us more details about the comment below:
I fear that as soon as the call to narrow succeeds, the remainingapplication will fail to work correctly because it is too difficult ot
use an idl client in java to work.It seems to me that Weblogic's RMI-IIOP is a very fragile
implementation. We
don't need a "HelloWorld" example, we need a concrete serious example(fully
tested and seriously documented) that works so that we can get a betteridea
on how to integrate CORBA and EJB.
Thanks,
Said
"Eduardo Ceballos" <[email protected]> wrote in message
news:[email protected]...
Please post request to the news group...
As I said, you must separate the idl related classes (class files and
java
files) from the rmi classes... in the rmic step, you must set a newtarget
(as you did), emit the java files into that directory (it's not clearyou
did this), then remove all the rmi class files from the class path... ifyou
need to compile more classes at that point, copy the java files to theidl
directly is you must, but you can not share the types in any way.
I fear that as soon as the call to narrow succeeds, the remainingapplication will fail to work correctly because it is too difficult otuse
an idl client in java to work.
Harindra Rajapakshe wrote:
Hi Eduardo,
Thanks for the help. That is the way I compiled my CORBA client, by
separating the IDL-generated stubs from the RMI ones, but still I
get a
CORBA.BAD_PARAM upon narrowing the client proxy to the interfacetype.
Here's what I did;
+ Define the RMI interfaces, in this case a StockTrader interface.
+ Implement RMI interface by extendingjavax.rmi.PortableRemoteObject
making
it IIOP compliant
+ Implemnnt an RMI server, and compile using JDK1.2.2
+ use the RMI implementation to generate CORBA idl, using RMI-IIOPplugin
utility rmic;
rmic -idl -noValueMethods -always -d idl stock.StockTraderImpl
+ generate Java mappings to the IDL generated above, using RMI-IIOPplugin
util,
idlj -v -fclient -emitAll -tf src stocks\StockTrader.idl
This creates source for the package stock and also
org.omg.CORBA.*
package, presumably IIOP type marshalling
+ compile all classes generated above using JDK1.2.2
+ Implement client (CORBA) using the classes generated above, NOTthe
RMI
proxies.
+ start RMI server, with stockTrader server obj
+ start tnameserv
+ start CORBA client
Then the client errors when trying to narrow the obj ref from the
naming
service, into the CORBA IDL defined interface using,
org.omg.CORBA.Object obj =naming.resolve(nn);
StockTrader trader =StockTraderHelper.narrow(obj); // THIS
ERRORS..!!!
throwing a CORBA.BAD_PARAM exception.
any ideas..?
Thanks in advance,
-hari
----- Original Message -----
From: Eduardo Ceballos <[email protected]>
Newsgroups: weblogic.developer.interest.rmi-iiop
To: Hari Rajapakshe <[email protected]>
Sent: Wednesday, July 26, 2000 4:38 AM
Subject: Re: problem using CORBA clients with RMI/EJBservers..!!!???
Please see the post on june 26, re Errors compiling... somewherein
there,
I suspect, you are referring to the rmi class file when you are
obliged
to
completely segregate these from the idl class files.
Hari Rajapakshe wrote:
Hi,
I have a question on using EJB / or RMI servers with CORBA
clients
using
RMI-IIOP transport, which in theory should work, but in practice
has
few
glitches.
Basically, I have implemented a very simple server,
StockTreader,
which
looks up for a symbol and returns a 'Stock' object. In the firstexample, I
simplified the 'Stock' object to be a mere java.lang.String, so
that
lookup
would simply return the 'synbol'.
Then I have implemented the above, as an RMI-IIOP server (case
1)
and a
CORBA server (case 2) with respective clients, and the pair of
client-servers work fine as long as they are CORBA-to-CORBA andRMI-to-RMI.
But the problem arises when I tried using the RMI server (via
IIOP)
with
the
CORBA client, when the client tries to narrow the object ref
obtained
from
the naming service into the CORBA idl defined type (StockTrader)
it
ends
up
with a class cast exception.
This is what I did to achieve the above results:
[1] Define an RMI interface StockTrader.java (extending
java.rmi.Remote)
with the method,
public String lookup( String symbol) throws RMIException;
[2] Implement the StorckTrader interface (on a
PortableRemoteObject
derived
class, to make it IIOP compliant), and then the server to
register
the
stock
trader with COS Naming service as follows:
String homeName =....
StockTraderImpl trader =new StockTraderImpl();
System.out.println("binding obj <" homeName ">...");
java.util.Hashtable ht =new java.util.Hashtable();
ht.put("java.naming.factory.initial", args[2]);
ht.put("java.naming.provider.url", args[3]);
Context ctx =new InitialContext(ht);
ctx.rebind(homeName, trader);
[3] Generate the RMI-IIOP skeletons for the Implementation
class,
rmic -iiop stock.StockTraderImpl
[4] generate the IDL for the RMI interface,
rmic -idl stock.StockTraderImpl
[5] Generate IDL stubs for the CORBA client,
idlj -v -fclient -emitAll StockTraderImpl.idl
[6] Write the client to use the IDL-defined stock trader,
String serverName =args[0];
String symList =args[1];
StockClient client =new StockClient();
System.out.println("init orb...");
ORB orb =ORB.init(args, null);
System.out.println("resolve init name service...");
org.omg.CORBA.Object objRef
=orb.resolve_initial_references("NameService");
NamingContext naming=NamingContextHelper.narrow(objRef);
... define a naming component etc...
org.omg.CORBA.Object obj =naming.resolve(...);
System.out.println("narrow objRef: " obj.getClass() ":"
+obj);
StockTrader trader =StockTraderHelper.narrow(obj);
[7] Compile all the classes using Java 1.2.2
[8] start tnameserv (naming service), then the server to
register
the
RMI
server obj
[9] Run the CORBA client, passing it the COSNaming service ref
name
(with
which the server obj is registered)
The CORBA client successfully finds the server obj ref in the
naming
service, the operation StockTraderHelper.narrow() fails in thesegment
below, with a class cast exception:
org.omg.CORBA.Object obj =naming.resolve(...);
StockTrader trader =StockTraderHelper.narrow(obj);
The <obj> returned by naming service turns out to be of the
type;
class com.sun.rmi.iiop.CDRInputStream$1
This is of the same type when stock trader object is registeredin a
CORBA
server (as opposed to an RMI server), but works correctly with
no
casting
excpetions..
Any ideas / hints very welcome.
thanks in advance,
-hari

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.

Multiple clients with role production

Dear SAP experts,
Is it possible to assign the client role "production" (in scc4) to multiple clients in 1 instance. If the answer is yes then how can it be done because if I try to do it via ssc4 i get an error that there already is a production client..
I have searched the forum, SAPNET and googled but I could not find a definitive answer.
Thanks for your patience and answers.
Regards
Dirk Visser

Hi all,
I discovered that it can be done. Just set the role to production and ignore the warning.

Need best practice to deploy similar content to multiple clients with specific skins/images

Hello, my name is Bernadette. When I was with a previous employer for several years I created WebHelp using RoboHelp 8. Then, the last two years I worked there I transitioned to MadCap Flare again creating WebHelp. I have been with a new employer two years now, using RoboHelp again. However, this company still has us creating HTML Help only. My manager has just assigned me to create and launch our first WebHelp project. Currently, we have RoboHelp 8, with a P.O. in process to purchase version 9 hopefully very soon. However, I cannot wait and have just started the project using version 8. Since it's been a few years, I am a tad rusty in my use of RoboHelp/WebHelp. For this first project, I have been asked to customize the skin for EACH client that transitions to the new proprietary application. My question is, since it is likely that the contents of the completed WebHelp project will be identical (with the exception of the customized customer-specific skins, logos and window images) is there a creative, timesaving method for rolling out primarily the same content to each customer WITHOUT the need for me to maintain numerous, individual WebHelp projects? I so appreciate any input or suggestions. Thank you!

Hello Peter and Jeff, there IS the potential for eventually reaching a HUGE number of customers, but I would expect that to take at least a good number of months or beyond to get to that stage. As for Peter's question about variables, I have used conditional build tags in the past, which I know is a variable, but I am not certain what else might be included in the category.
I was not aware that it is possible, within a single project, to create and maintain different versions of the same layout type, namely WebHelp by creating duplicates for each customer. This could be challenging, but fun! So, as I get further into this I assume you are both "on call" for additional questions? Thank you both so much for your rapid responses.

Can anyone show me an example of multiple clients(RMI)?

Hi.
Can anyone show me one simple example of a server serving multiple clients using RMI?
I know that I have to use thread but I'm not really use to it...
Thank you :)

You don't have to use threads, you don't have to do anything. Any RMI server will service multiple clients simultaneously.

Ep 6.0 single backend multiple clients

Dear all,
system details: ecc 5.0 unicode sap aba 16, basis 16,appl 11,hr 19+MSSQL 2000 with collation bin2 (SP4) and windows 2003. EP 6.0 SP9 WebAS 6.40 sr1
First i installed portal with rapid installer 2.5.1 but it connects only with client 000. i tried to give client 100 at installation time but it was not accepted.
Then i installed with netweaver 04 dvd. it accepted client 100.
now my company want that portal should be connected to multiple client with backend system as my backend system is development and they will check first in a sandbox client and then with user testing in a test client.
How to do this.
Secondly, in user management>role "page cannot be displayed" error and this error is coming only in this page.
One thing i should tell you that when i installed with rapid installer it was working fine with client 000 but when i changed the client in system landscape i was able to logon no tab displayed. the message was that the user may not have proper authorizations. may be something to do with portal roles. I want to know how can i transport these portal roles or user config to other clients.
in WP3R, it says no object found.
Can anyone help
Thanks
Imran Hasware

HI Imran,
u used User management with ABAP system than u have to assign the role to user from R3 system side. after assignning a role u start the J2EE server.
check the follwoing
http://help.sap.com/saphelp_nw04/helpdata/en/49/9dd53f779c4e21e10000000a1550b0/content.htm
regards,
kaushal

RMI: multiple clients for one RMI server?

Hi,
We're thinking of making a RMI Server.
However, can multiple clients access the same RMI Server at the same moment?
So, if one client is connected to the RMI Server, what will happen with the other clients that want to work to do the same thing at the same moment ?

all over the same port?
so for example, 100 clients can work simultaneously on this simple server?
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface OkServer extends Remote {
    public String getOk() throws RemoteException;
import java.rmi.server.UnicastRemoteObject;
import java.rmi.RMISecurityManager;
import java.rmi.RemoteException;
import java.rmi.Naming;
public class OkServerImpl extends UnicastRemoteObject implements OkServer {
    public OkServerImpl() throws RemoteException {
    public String getOk() {
     return "ok";
    public static void main (String args[]) throws Exception {
          System.setSecurityManager(new RMISecurityManager());
          OkServerImpl OkSvr = new OkServerImpl();
          Naming.bind("OkServer", OkSvr);
}

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

Problem with multiple client numbers from a view

Hi Gurus,
I have a problem with a view
Creates a view with a UNION ALL stmt
=====================================
Create view vw_benifits
as
SELECT
     Client_num, -- can have multiple values like 200,201,250
     PERNR,
     OBJPS,
     ENDDA,
     BEGDA,
     AEDTM,
     UNAME,
     COB_MNTH_AMT
FROM
     STG_SAP_PA9211_TB
UNION ALL
SELECT
     null, -- no client number for legacy data
     PERNR,
     OBJPS,
     ENDDA,
     BEGDA,
     AEDTM,
     UNAME,
COB_MNTH_AMT
from
     LEG_STG_SAP_PA9211_TB;
==============================
The second table contains legacy data (LEG_STG_SAP_PA9211_TB). The first table now contains multiple client data (ie the client_num can be 201,202,250 like that.
Now if the users qery the view they will only get that clients data.
eg selet * from vw_benifits where client_num=250 results only client 250 data. But I want to add the legacy data also with that.
I don't want to propose
selet * from vw_benifits where client_num in (250,NULL) since the users will be confused.
Is there any other way to do this . my requirement is like
If they query
select * from vw_benifits where client_num=250, the data should include all the records satisfying client=250 + the records from the legacy data. The view need to be created like that.
Appreciate your help
Deepak

Hi Thanks for the suggestion.
But I am not sure this may work for me. Here my users may not be able to use that since they don't know Oracle.
I want to hide that details from them
They may just issue a statement like this
select * from vw_benifits where client_num =250
Or
select * from vw_benifits where client_num =400 . But both times I need to show them the data from the legacy table.
Deepak

With the new Time Capsule does the beam forming occur with multiple clients, and do these clients have to be 802.11ac compatible?

With the new Time Capsule 5th Gen does the beam forming occur with multiple clients, and do these clients have to be 802.11ac compatible?

does the beam forming occur with multiple clients
Yes, but Apple is unclear about how many cients can be connected simultaneously with this feature.
do these clients have to be 802.11ac compatible?
Yes

NLS_LANG setting for a client with multiple Oracle servers

Hello!
We have a web application which has to connect to one of the Oracle servers with different charactersets. When the NLS_LANG on the client is a single byte encoding and the server has a single byte encoding there are no problems. We have now a server with NLS_CHARACTERSET UTF8 and all special (hungarian accented) character are replaced.
When we set the client to UTF8 the rest of servers does not work.
What is the solution for one client and multiple servers with different encoding?
Is there a special key in connection string?
I tried to change the nls_lang with an alter session statement but without success.
Regards,
emeriqus

NLS_LANG is not depending on the database side, it's a CLIENT setting to "let Oracle know what encoding is used on the CLIENT" so that Oracle can do the conversion from the client encoding to the database (NLS_CHARACTERSET) encoding.
for ONE application/client the is only ONE correct NLS_LANG value, regardless of the database NLS_CHARACTERSET
If you web application is really an UTF8 application (check with your vendor) then you can perfectly use a UTF8 client setting and a 8 bit database
Of course, you will be limited to the database side in this case seen the 8 bit characterset does not know all the characters in UTF8
The fact that setting the NLS_LANG to UTF8 "does not work" with your web application is simply the fact your application is not a UTF8 env.
Setting nls_lang to UTF8 will not "magically" make your application UTF8, NLS_LANG is depending on the encoding used in the web server.
But the first thing to ask yourself is if CURRENT data is correctly in the Oracle database.
use SQLdeveloper to check the data, this is a "know good client" that needs no NLS configuration.
You can download it from http://www.oracle.com/technology/products/database/sql_developer/
If the data is displayed correctly in SQLdeveloper then you are sure it's correct in the database.
If data is WRONG in the database then that needs to be corrected first, "trying" different client side configurations will only make matter worse (even if they make the data "look good" )
Regards,
Gunther
Client side notes on mentalink:
Note:158577.1> NLS_LANG Explained (How does Client-Server Character Conversion Work?)
1.2 What is this NLS_LANG thing anyway?
3.2 A detailed example of a wrong nls setup to understand what's going on.
4.2 How can I Check the Client's NLS_LANG Setting?
5.1 My windows sqlplus is not showing all my extended characters.
Note:179133.1> The correct NLS_LANG in a Windows Environment
Note:264157.1> The correct NLS_LANG setting in Unix Environments
Note:229786.1> NLS_LANG and webservers explained.
Note 115001.1> NLS_LANG Client Settings and JDBC Drivers
When using Unicode start here:
Note:788156.1> AL32UTF8 / UTF8 (Unicode) Database Character Set Implications
Setting NLs parameters: <Note:241047.1> The Priority of NLS Parameters Explained.

How does create a server with multiple Clients ?

Any people can lead me .
How does create a server with multiple Clients ?
Thanks

For a multithreaded server you will need a thread to listen and at least one thread per client. If the conversation is half duplex, one thread per client works very well, if it's full duplex you will find one thread to send and one to receive much easier to program.
I posted a Simple Socket Server that uses 1+2*clients threads.

Drop insert in receiver system with multiple clients

Hello,
does TDMS handle drop-insert technology in a multiple client receiver system automatically?
What can be the impact for the other clients when they are working while data deletion in the
receiver client?
Regards Karlheinz

Hello Karlheinz,
Good, question is straight and clear now.
please refer to steps mentioned in oss note 1433553 to make sure that TDMS should not consider drop_insert in TDMS migration.
Regards,
Amit Sharma
Solution
You have the possibility to set a Global Parameter for setting the deletion
scenario to overall array delete. In the following a description of the
proceeding.
Check if the global parameter GLOBAL_NO_DROP_INSERT exists
and that it is set to 'X' in the receiver system.
Call the Migration Server Overview(tcode cnv_mbt_tdms).
Expand the tree until you get your package.
Mark the package number so that it is highlighted.
In the menu click on Goto->Global Parameter.
When you have correctly positioned your cursor on a package number you
will see in the application toolbar buttons named with the exection targets,
system name and client number. You can also see if a connection to the listed
system is working (checkmark) or not (lightning).
Click on the button
'RECEIVER' to get the global parameters from the receiver system. This is where
the Global Parameter has to be set.
The global parameter entries will be
delivered empty and for the parameter you want to use you have to set the value.
An initial global parameter has no value in the column 'Client'.
Mark the row with the global parameter
'GLOBAL_NO_DROP_INSERT'.
Press button copy text (third button).
In the menu bar click on the drop-down box of the insert button and choose
the item 'Insert in new row' in the selection list (forth button from
left).
In column 'Client' enter the client where you want to use the overall
scenario array-delete. If you enter the value 'ALL' then the setting is valid
for all clients in the system.
In the column 'Parameter Value (from)' enter the value 'X'.
Save your settings.
If the parameter already exist you have to check whether the correct
client is set. If the column 'Client' includes the deletion client or the value
'ALL' then no further settings are required. Otherwise you have to copy the
Global Parameter as previously described and change the value in the column
'Client' with your deletion client. Take care that the value in column
'Parameter Value (from)' is 'X'.
From now on the generation of deletion
programs will use this information to create the deletion programs with deletion
scenario ARRAY-DELETE.

Multiple clients with RMI

Similar Messages

Maybe you are looking for