BI7.0 Portal buffer clear
Hi,
I have assigned the iviews to roles which got migrated from BW abap to BW Portal by synchroizing the roles.
But when user loggs in he is not seeing the reports.
How to clear the buffer or cahse in BI Portal
Thanks
Naveen
TA SMICM -> GOTO -> HTTP Server Cache -> Display -> Delete all cache objects. Mark them and press the delete button .,
hope this helps.,
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Hi,
I'm writing a proxy application that relays data from a server to a client that requested the data. One thing I have observed is that when I have read about 32136 bytes of data, my reads from my buffered input stream fetch only one byte at a time. Not only is my read function now reading only one byte at a time, but it takes over a minute to fetch 83 bytes of data. And the delay gets worse the longer I run.
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// Variables
var x0:int;
var y0:int;
var x1:int;
var y1:int;
var x2:int;
var y2:int;
var x3:int;
var y3:int;
var dx0:int;
var dy0:int;
var dx1:int;
var dy1:int;
var dx2:int;
var dy2:int;
var dx3:int;
var dy3:int;
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x0 = int(Math.random() * 320);
x1 = int(Math.random() * 320);
y0 = int(Math.random() * 200);
y1 = int(Math.random() * 200);
x2 = x0;
x3 = x1;
y2 = y0;
y3 = y1;
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dx1 = int(Math.random() * 5);
dy0 = int(Math.random() * 5);
dy1 = int(Math.random() * 5);
dx2 = dx0;
dx3 = dx1;
dy2 = dy0;
dy3 = dy1;
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var bitmap:BitmapData = new BitmapData(stage.stageWidth,stage.stageHeight,true,0xff000000);
var buffer:BitmapData = new BitmapData(stage.stageWidth,stage.stageHeight,true,0xff000000);
var image:Bitmap = new Bitmap(bitmap);
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buffer.draw(clearBuffer);
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drawing.graphics.lineTo(x1,y1);
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if ((x1 += dx1) >= 315 || x1 < 5)
dx1 *= -1;
if ((y1 += dy1) >= 195 || y1 < 5)
dy1 *= -1;
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drawing.graphics.lineStyle(1, 0x000000);
drawing.graphics.moveTo(x2,y2);
drawing.graphics.lineTo(x3,y3);
if ((x2 += dx2) >= 315 || x2 < 5)
dx2 *= -1;
if ((y2 += dy2) >= 195 || y2 < 5)
dy2 *= -1;
if ((x3 += dx3) >= 315 || x3 < 5)
dx3 *= -1;
if ((y3 += dy3) >= 195 || y3 < 5)
dy3 *= -1;
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counter = 51;
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buffer.draw(drawing, drawing.transform.matrix);
bitmap.draw(buffer);
P.S. - Is there a way I can post my code in a smaller box with a scrollbar?Here is a fixed version:
// Variables
var x0:int;
var y0:int;
var x1:int;
var y1:int;
var x2:int;
var y2:int;
var x3:int;
var y3:int;
var dx0:int;
var dy0:int;
var dx1:int;
var dy1:int;
var dx2:int;
var dy2:int;
var dx3:int;
var dy3:int;
var counter:int = 0;
var drawing:Shape = new Shape();
var color1:uint = uint(0xFFFFFF * Math.random());
// Initialize Line Values
x0 = int(Math.random() * 320);
x1 = int(Math.random() * 320);
y0 = int(Math.random() * 200);
y1 = int(Math.random() * 200);
x2 = x0;
x3 = x1;
y2 = y0;
y3 = y1;
// Initializing Line Velocities
dx0 = int(Math.random() * 5);
dx1 = int(Math.random() * 5);
dy0 = int(Math.random() * 5);
dy1 = int(Math.random() * 5);
dx2 = dx0;
dx3 = dx1;
dy2 = dy0;
dy3 = dy1;
// Double Buffer Setup
var bitmap:BitmapData = new BitmapData(stage.stageWidth,stage.stageHeight,true,0xff000000);
var buffer:BitmapData = new BitmapData(stage.stageWidth,stage.stageHeight,true,0xff000000);
var image:Bitmap = new Bitmap(bitmap);
addChild(image);
// Listeners
addEventListener(Event.ENTER_FRAME,onEnterFrame);
function onEnterFrame(event:Event):void {
// Logic
drawing.graphics.lineStyle(1, color1);
drawing.graphics.moveTo(x0,y0);
drawing.graphics.lineTo(x1,y1);
if ((x0 += dx0) >= 315 || x0 < 5)
dx0 *= -1;
if ((y0 += dy0) >= 195 || y0 < 5)
dy0 *= -1;
if ((x1 += dx1) >= 315 || x1 < 5)
dx1 *= -1;
if ((y1 += dy1) >= 195 || y1 < 5)
dy1 *= -1;
if (++counter > 50) {
drawing.graphics.lineStyle(1, 0x000000);
drawing.graphics.moveTo(x2,y2);
drawing.graphics.lineTo(x3,y3);
if ((x2 += dx2) >= 315 || x2 < 5)
dx2 *= -1;
if ((y2 += dy2) >= 195 || y2 < 5)
dy2 *= -1;
if ((x3 += dx3) >= 315 || x3 < 5)
dx3 *= -1;
if ((y3 += dy3) >= 195 || y3 < 5)
dy3 *= -1;
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buffer.draw(drawing, drawing.transform.matrix);
bitmap.draw(buffer);
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drawing.graphics.clear();
Basically you have to use the graphics.clear() function to erase any clip where you are using the drawing API. Drawing lots of vectors can be very costly performance-wise so you always want to clear your graphics when you are finished. Drawing over the vectors with a rectangle has no effect except to increase the load even more. However when dealing with bitmap objects you can safely draw as much as you want for as long as you wish with no performance hit. Thats why what you were trying to do with that "clearBuffer" was not doing anything. Also, setting the counter to 51 when it got to 250 was doing nothing whatsoever. Not sure what that was for. The code should work fine now. -
Java.nio select() method return 0 in my client application
Hello,
I'm developing a simple chat application who echo messages
But my client application loop because the select() method return 0
This is my code
// SERVER
package test;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Set;
public class Server {
private int port = 5001;
public void work() {
try {
ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();
serverSocketChannel.configureBlocking(false);
InetSocketAddress isa = new InetSocketAddress(port);
serverSocketChannel.socket().bind(isa);
Selector selector = Selector.open();
serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);
System.out.println("Listing on "+port);
while(selector.select()>0) {
Set keys = selector.selectedKeys();
for(Iterator i = keys.iterator(); i.hasNext();) {
SelectionKey key = (SelectionKey) i.next();
i.remove();
if (key.isAcceptable()) {
ServerSocketChannel keyChannel = (ServerSocketChannel)key.channel();
SocketChannel channel = keyChannel.accept();
channel.configureBlocking(false);
channel.register(selector, SelectionKey.OP_READ );
} else if (key.isReadable()) {
SocketChannel keyChannel = (SocketChannel) key.channel();
String m = Help.read(keyChannel );
Help.write(m.toUpperCase(), keyChannel );
} catch (IOException e) {
e.printStackTrace();
public static void main(String[] args) {
Server s = new Server();
s.work();
// CLIENT
package test;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Set;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class Client extends JFrame {
private String host = "localhost";
private int port = 5001;
private SocketChannel socketChannel;
private Selector selector;
public void work() {
try {
socketChannel = SocketChannel.open();
socketChannel.configureBlocking(false);
InetSocketAddress isa = new InetSocketAddress(host, port);
socketChannel.connect(isa);
selector = Selector.open();
socketChannel.register(selector, SelectionKey.OP_CONNECT | SelectionKey.OP_READ );
while(true) {
selector.select();
Set keys = selector.selectedKeys();
for(Iterator i = keys.iterator(); i.hasNext();) {
SelectionKey key = (SelectionKey) i.next();
i.remove();
if (key.isConnectable()) {
SocketChannel keyChannel = (SocketChannel) key.channel();
if (keyChannel.isConnectionPending()) {
System.out.println("Connected "+keyChannel.finishConnect());
} else if (key.isReadable()) {
SocketChannel keyChannel = (SocketChannel) key.channel();
String m = Help.read(keyChannel);
display(m);
} catch (IOException e) {
e.printStackTrace();
private void display(final String m) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
area.append(m+"\n");
textFieed.setText("");
private void sendMessage(final String m) {
Thread t = new Thread(new Runnable() {
public void run() {
try {
Help.write(m, socketChannel);
} catch (IOException e) {
e.printStackTrace();
t.start();
public Client() {
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(1);
textFieed.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
if (e.getKeyCode()== KeyEvent.VK_ENTER) {
String m = textFieed.getText();
sendMessage(m);
area.setEditable(false);
getContentPane().add(textFieed, "North");
getContentPane().add(new JScrollPane(area));
setBounds(200, 200, 400, 300);
show();
private String messageToSend;
private JTextArea area = new JTextArea();
JTextField textFieed = new JTextField();
public static void main(String[] args) {
Client s = new Client();
s.work();
// HELPER CLASS
package test;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.channels.SocketChannel;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharsetEncoder;
public class Help {
private static Charset charset = Charset.forName("us-ascii");
private static CharsetEncoder enc = charset.newEncoder();
private static CharsetDecoder dec = charset.newDecoder();
private static void log(String m) {
System.out.println(m);
public static String read(SocketChannel channel) throws IOException {
log("*** start READ");
int n;
ByteBuffer buffer = ByteBuffer.allocate(1024);
while((n = channel.read(buffer)) > 0) {
System.out.println(" adding "+n+" bytes");
log(" BUFFER REMPLI : "+buffer);
buffer.flip();
CharBuffer cb = dec.decode(buffer);
log(" CHARBUFFER : "+cb);
String m = cb.toString();
log(" MESSAGE : "+m);
log("*** end READ");
//buffer.clear();
return m;
public static void write(String m, SocketChannel channel) throws IOException {
log("xxx start WRITE");
CharBuffer cb = CharBuffer.wrap(m);
log(" CHARBUFFER : "+cb);
ByteBuffer buffer = enc.encode(cb);
log(" BUFFER ALLOUE REMPLI : "+buffer);
int n;
while(buffer.hasRemaining()) {
n = channel.write(buffer);
System.out.println(" REMAINING : "+buffer.hasRemaining());
log("xxx end WRITE");Here's the fix for that old problem. Change the work method to do the following
- don't register interest in things that can't happen
- when you connect register based on whether the connection is complete or pending.
- add the OP_READ interest once the connection is complete.
This doesn't fix all the other problems this code will have,
eg.
- what happens if a write is incomplete?
- why does my code loop if I add OP_WRITE interest?
- why does my interestOps or register method block?
For code that answers all those questions see my obese post Taming the NIO Circus
Here's the fixed up Client code
// CLIENT
package test
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Set;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class Client extends JFrame {
private String host = "localhost";
private int port = 5001;
private SocketChannel socketChannel;
private Selector selector;
public void work() {
try {
socketChannel = SocketChannel.open();
socketChannel.configureBlocking(false);
InetSocketAddress isa = new InetSocketAddress(host, port);
socketChannel.connect(isa);
selector = Selector.open();
int interest = 0;
if(socketChannel.isConnected())interest = SelectionKey.OP_READ;
else if(socketChannel.isConnectionPending())interest = SelectionKey.OP_CONNECT;
socketChannel.register(selector, interest);
while(true)
int nn = selector.select();
System.out.println("nn="+nn);
Set keys = selector.selectedKeys();
for(Iterator i = keys.iterator(); i.hasNext();)
SelectionKey key = (SelectionKey) i.next();
i.remove();
if (key.isConnectable())
SocketChannel keyChannel = (SocketChannel) key.channel();
System.out.println("Connected "+keyChannel.finishConnect());
key.interestOps(SelectionKey.OP_READ);
if (key.isReadable())
SocketChannel keyChannel = (SocketChannel) key.channel();
String m = Help.read(keyChannel);
display(m);
} catch (IOException e) {
e.printStackTrace();
private void display(final String m) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
area.append(m+"\n");
textFieed.setText("");
private void sendMessage(final String m) {
Thread t = new Thread(new Runnable() {
public void run() {
try {
Help.write(m, socketChannel);
} catch (IOException e) {
e.printStackTrace();
t.start();
public Client() {
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(1);
textFieed.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
if (e.getKeyCode()== KeyEvent.VK_ENTER) {
String m = textFieed.getText();
sendMessage(m);
area.setEditable(false);
getContentPane().add(textFieed, "North");
getContentPane().add(new JScrollPane(area));
setBounds(200, 200, 400, 300);
show();
private String messageToSend;
private JTextArea area = new JTextArea();
JTextField textFieed = new JTextField();
public static void main(String[] args) {
Client s = new Client();
s.work(); -
Is there a way to set timeout in asynchronus sockets ?
Hi,
I'm writing client-server application (many clients). Server get's data from all clients periodically. My issue is: clients can send big parts of data, and beetwen consecutive write operations on client some breaks can occur (eg. 2sec.).
What happens on server is: read method returns bytes in while loop unitil it returns 0. And 0 is returned when that break occurs on client. So the issue is that server thinks it is already the end of the transmission (while loop ends and I begin to analyze data which was send), whereas some data will arrive after eg. 1second. How can I address that issue ?
At the moment I'm testing my app on Windows but eventually it will run on Linux. I'm using Java Non-blocking Sockets.
Thanks, Pawel
Edited by: PawelWu on Mar 4, 2008 12:33 PMJust in case I didn't make myself clear.
CLIENT: That code pretends break in sending data. Data wrote to server in second iteration is not recieved by the server.
for(int i = 0; i < 2; i++ )
String toSend = _data.get(0);
System.out.println("Sending data: "
+ toSend);
buffer.clear();
buffer.put(toSend.getBytes());
buffer.flip();
client.write(buffer);
if ( i == 0 ) {
System.out.println("1/2 Data send... sleeping");
Thread.sleep(5000);
} else {
_data.remove(0);
System.out.println("Data send");SERVER: Server gets only 1/2 of the data.
_buffer.clear();
while (channel.read(_buffer) > 0) {
_buffer.flip();
while (_buffer.hasRemaining()) {
int i = _buffer.get();
System.out.print((char) i);
_buffer.clear();
System.out.println("\nAll data read!"); -
I know this is probably possible, I just don't know how to
best go about doing it. I would like to write a program to sample a waveform
off of AI0 and output that same waveform on AO0 real time (or as close to real
time as I can get) - with the eventual goal of doing some processing on that
waveform in between. But for right now all I am trying to do is create a
program to do AI to AO.
The examples I have seen for doing simultaneous AI/AO have the output fixed
while it samples data on the input. That is not what I want. I want to be able
to spit out the signal that is present on the input ADC. Also when I try to
modify the program, I get these long (5+ second) delays in between what is
present on the input and what it produces on the output. I have tried
increasing the sample rate and/or reducing the number of samples but that just
causes errors – I’m loosing data because one process is taking too long to
complete.
Is there a way to make a streamlined program to simulate an
analog buffer?
Details:
NI Device: USB 6251
Software: Labview 8.5
Preferred Sample Rate: 40 kHz
Preferred delay AI to AO: < 0.1 second
I have no code started that I could post. I am wondering if
anybody has done this or has an idea about how to do it, i.e. I need to use a
queue to buffer data from the AI chain to the AO chain.
Thanks
JimHello Jim,
Andre is correct that our main concern here is going to be the buffer
delay. There are 2 other main delays that we need to be concerned
about as well. These are software processing and USB bus transfer
rates. Andre's example for the output should work, but I believe it is
a little more complicated than you probably need. He is using a state
machine architecture with an event structure, which is easy to expand
but can be difficult to follow for a task such as yours.
The producer/consumer would work as well, especially if the processing
you are planing on implementing is significant, but this too I think
may be beyond your initial goal. This is, however, a great way to get
rid of "loosing data because one process is taking too long to
complete."
The reason you are seeing the delay is most likely due to the buffer
clearing out. When you call the DAQmx write, it puts the data at the
end of the buffer, so all the data ahead of it needs to be output
first. You can reduce this delay by using non regeneration (see the
example program named Cont Gen Voltage Wfm-Int Clk-Non Regeneration.vi
in the Example Finder) and writing smaller chunks (samples to write).
The trick with this is you will get an error if you do not keep some
data in the buffer that has not been written.
You also might want to get rid of buffers all together and use hardware
single point timing for your output (instead of continuous). This is
when you write 1 point at a time to the card and it is output on the
next hardware timed sample clock pulse. You can use this in
conjunction with the Wait for Next Sample Clock.vi (in the DAQmx Real
TIme palette). The problem with this is that because you dont have a
buffer, you can only go as fast as you can write points (my computer
could go about 500Hz if I did not do anything else at the same time).
The USB is a slower bus than, for example, PCI. This means that it takes longer to get data to and from the board (there is a lot of overhead). This could become an issue at the rates you want.
I hope this gives you some ideas. Let me know if you want me to go into more depth about anything or if you have any questions.
Message Edited by Neal M on 06-17-2008 01:20 PM
Neal M.Applications Engineering National Instruments www.ni.com/support
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