Use of synchronized keyword with portal services

Hi,
Can you confirm me if it is true that a portal service is a Singleton? I mean, when using an instance variable of a portal service I am able to set the value of the instance variable using one client app and get it afterwards using another client app. So we are talking about the same and only instance of the portal service, right?
If this is true how can I synchronize the access to a portal's service method? I tried to mark
the method syncronized (in the interface) but then I realized that this issues a compiler error because one can not mark an interface method synchronized. So can I mark the implementation class instead? That is, can I leave the interface without the synchronized keyword for the method and still mark the implementation of the method in the service class as syncronized? Does this work?
Thanks in advance,
Diz

Hi,
Portal service is not a Singleton, as the name says a service is just provider for services which does not save state between two requests/applications.
So if you want to save state, then use some session variables to save it.
In a cluster installation, each server node has its own portal services, so if you save state in service, then your application should save this state on all servers of the cluster.
So you should change your approch.
http://help.sap.com/saphelp_nw70/helpdata/en/e3/fab74247e2b611e10000000a155106/frameset.htm
Greetings,
Praveen Gudapati
[Points are always welcome for helpful answers]

Similar Messages

Use VB Set keyword with Clone method?

I am using the TestStand API with Visual Basic 6.0 SP5. Is is necessary to use the Set keyword when calling the Clone method of a PropertyObject? i.e. which is correct:
Set thePropObj = existingPropObj.Clone("", 0)
or
thePropObj = existingPropObj.Clone("", 0)
Seems the Set keyword would be required, but I am
running into funny problems with this. I have a step
that I am trying to create a copy of. (The step contains a call to a LabVIEW VI.) If I omit the Set keyword, execution hangs at the call to Clone. If I include the Set keyword, all information present in the original PropertyObject doesn't seem to get copied to the new one. (Also, oddly enough, if I omit the set keyword, and the step calls a CVI function, everything seems to work
fine!)
Anyone have any advice?
Thanks in advance
D. LaFosse

Hello LaFosse,
You need to use the Set keyword before the clone method statement. However, I have a couple of comments about the code you sent.
This is the code you sent:
' Start up the testStand engine
Dim theTS As TS.Engine
Set theTS = New TS.Engine
' OK, load in the sequence file I
' created. This sequence file
' contains nothing more than a call
' to a VI in the main stepgroup of
' the MainSequence.
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Set seqFile =
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' get a handle to the MainSequence
Dim seq As Sequence
Set seq = seqFile.GetSequenceByName
("MainSequence")
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' the VI, and a property object for
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Dim theStep As Step
Set theStep =
seq.GetStep(0, StepGroup_Main)
Dim theStepProp As PropertyObject
Set theStepProp =
theStep.AsPropertyObject
' Create another step. We will attempt
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Dim theOtherStep As Step
Dim theOtherStepProp As PropertyObject
Set theOtherStep = theTS.NewStep("",
TS.StepType_Action)
Set theOtherStepProp =
theOtherStep.AsPropertyObject
' Call clone...this step will hang.
theOtherStepProp =
theStepProp.Clone("", 0)
Basically the problem is that you are not loading the TypePallete after creating the engine. You shoud include right after the Set theTS = New TS.Engine:
theTS.LoadTypePaletteFiles
This should avoid the crash.
Some Additional comments:
1. With VB you don't need to create property objects from other objects. All the classes, except the Engine Class, inherit from the Property Object Class. The following Code does the same thing, but without creating propertyobjects directly:
Sub MySub()
'Variable Declaration
Dim theTS As TS.Engine
Dim seqFile As SequenceFile
Dim seq As Sequence
Dim theStep As Step
Dim theOtherStep As Step
'Create the Engine
Set theTS = New TS.Engine
'Load the Types
theTS.LoadTypePaletteFiles
'Get Sequence File
Set seqFile = theTS.GetSequenceFile()
'Get Sequence
Set seq = seqFile.GetSequenceByName("MainSequence")
'Get Step
Set theStep = seq.GetStep(0, StepGroup_Main)
'Clone the Step
Set theOtherStep = theStep.Clone("", 0)
'Using the inheritance functionality
'gets the Step Status
'Notice that theOtherStep is not a PropertyObject
'and you can use all the properties and methods that
'applies to the PropertyObject Class to a Step class
'in this example
'Also, in VB when you are typing the statement, you
'will not see the PropertyObject Class properties and
'and Methods automatically if the variable is not a
'PropertyObject type. However, you can still use them
'as mentioned before
MsgBox (theOtherStep.GetValString("Result.Status", 0))
End Sub
2. When you create or modify sequence files programatically be carefull not to break the license Agreement. You need the development lisence when modifying sequences.
3. This piece of code is not completed, and you will need to shutdown the engine by the end.
4. Since you are not handling UI Messages, you will need to be carefull when loading sequences that have the SequenceFileLoad Callback. The engine posts UI Messages when executing this callback. Also when you shutdown the engine, UI Messages are posted. For both operations (Load Sequence and Shuutdown) you may prevent the engine from posting the message (You may check the options parameter for this two methods in TS Programmer Help.)
5. If you want to run a sequence, again you will need to incorporate in your code the UIMessage Handler part. (You may check the TS Programmer Help->Writing an Application Using the API->UI Messages). Otherwise it may hang since the engine posts UI Messages eventually.
Regards,
Roberto Piacentini
National Instruments
Applications Engineer
www.ni.com/support

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I want to have a pulling mechanism between the Portal application and the component that holds the NT username and password. If I were to log onto my NT box with username:XXX password: YYY and bring up the Portal application.. I wouldn't have to go through the Portal login process because the Portal application already pulled my username & password. Any thoughts?
null

Oracle9iAS Portal Knowledge Exchange has a community contribution that describes how to get the portal to authenticate users against their NT credentials, and subsequently, how to facilitate the transparent login of NT users to the Portal.
This contribution is from Damian Edwards and can be found in his community folder (labelled "DAEDW1"). Damian is one of the top rated contributors and his article on NT authentication with portal is one of the top rated community items. So you should be able to find links to his folder from the Knowledge Exchange portlets for "top rated community items" and "top rated community contributors".
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Can I buy a iphone 5s in USA and use it at India, with the service providers which Apple has a tie-up with ?

Can I buy a Iphone 5s In the United States of America and use it at India, with the carrier supporters such as Airtel,Aircel or Reliance ?

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Use of Synchronized Keyword / Concurrency

I have a program which makes two Writer threads (they add 1 to a shared
counter), A sampler Thread (like a reader thread � it also displays the
data held by the other thread). I have been playing around with the
synchronised keyword � but I am not sure how to interpret the
results..I'll post the code first....
the shared counter------------------------------
package sycTest;
public class Counter
{public int val = 0;}
the sampler / reader class----------------------
package sycTest;
public class Sampler extends Thread
private Counter c;
private MyThread A, B;
public Sampler ( MyThread A, MyThread B, Counter c ) {
this.A = A;
this.B = B;
this.c = c;
public void run()
while(true)
try { sleep( 1000 ); } catch (Exception x) { }
System.out.println
"A count = " + A.getCount() + ", " +
"B count = " + B.getCount() + ": " +
"A + B count = " + (A.getCount() + B.getCount()) + ", " +
"shared counter = " + c.val
the main class to get things started------------------------------------
package sycTest;
import java.util.Random;
public class Main
public static void main( String[] args )
Counter c = new Counter();
MyThread A = new MyThread( c );
MyThread B = new MyThread( c );
A.start(); B.start();
// create and start Sampler thread in one step
new Sampler( A, B, c ).start();
// main thread waits to read a carriage-return.
try {
     System.in.read();
catch( Exception e ) { }
System.exit(0);
/* rand_sleep function is used to generate "random switching" behaviour
assuming n > 0,
rand_sleep( n ) sleeps a random time between 0 and n millisec.
private static Random rand = new Random();
public static void rand_sleep( int maxms ) {
int ms = rand.nextInt() % maxms; // - maxms < ms < maxms
int amt=(ms + maxms + 1)/2;
try { Thread.sleep(amt); } catch(Exception e) { }
the thread / writer class-------------------------------------------
package sycTest;
public class MyThread extends Thread
private Counter sharedCounter;
public MyThread( Counter c ) { this.sharedCounter=c; }
private int count=0;
public int getCount() { return count; }
public void run() {
while(true)
          // simulate non-critical section by sleeping a "large" amount
          Main.rand_sleep(1000);
          synchronized (sharedCounter) {
          criticalSection();
          //Main.rand_sleep(1000);
          ++count;
private void criticalSection() {
int x=sharedCounter.val + 1;
Main.rand_sleep( 100 );
sharedCounter.val=x;
--the question!
The idea is that running the main methods gives something like
A count=13, B count=10: A + B count=23, shared counter=23
(where A and B are writer threads)
If I take out the synchronised keyword in the MyThread class, things get
much worse...the 'personal' totals of A and B do not equal the total
held in the shared counter rather quickly..
          criticalSection();
          //Main.rand_sleep(1000);
          ++count;
eg
A count=13, B count=10: A + B count=23, shared counter=22
However, adding the synchronised keyword (eclipse suggested
�sharedCounter� as the argument � the notes seem to suggest �this�, but
if I do that the synchronised keyword seems much like the example above...
synchronized (sharedCounter) {
          criticalSection();
          ++count;
this makes it much better...I never saw it get the counts 'wrong'
eg
A count=56, B count=72: A + B count=128, shared counter=128
Now comes the confusing bit...when I add some time between the 2 methods
within the sychonized block...
synchronized (sharedCounter) {
          criticalSection();
          Main.rand_sleep(1000);
          ++count;
Then mismatches appear very quickly, the program behaves very similarly
to when it didn't have the synchronised keyword...
Why is this? Is it because the Sampler class is asking what the values
of the shared and personal counters during the �Main.rand sleep(1000)�
call??
The other question I was hoping someone could help me with, is pointing
out what the difference is between �synchronized (sharedCounter)� and
�synchronized (this)� is in this context. Why does the later not do
anything in this example?
Thanks,
Julian

Hello Julian,
you're Sampler thread reads the different counters without any synchronization. He may call A.getCount() and get 5 back, then yield and then ask for c.val which was increased by A in the meantime. Or A increases it's own counter, then yields and lets the Sampler output nonsense.. ;)
To clear up the confusion surrounding Thread.sleep(long): It would be a waste to do nothing while the thread is sleeping, so another thread gets to play. Since the other MyThread is waiting on sharedCounter's monitor and the sleeping thread still owns it<sup>1</sup> the Sampler thread gets the execution time. Now the sampler gets going and you know the rest.
1: http://java.sun.com/docs/books/jls/third_edition/html/memory.html#17.9
EDIT: In future, use code-tags:
class MyClass {
    private int myField;
}will turn into
class MyClass {
    private int myField;
}With kind regards
Ben
Edited by: BenSchulz on Mar 24, 2008 11:45 AM

Is it possible to use TCP/IP Monitor with web services?

Hi!
I have created a web service in workshop 10 and deployed it on a WLS10 inside workshop. I have turned on TCP/IP monitoring and in this case it uses port 13458. I have also generated a test client using the clientgen ANT task.
Now I'm using the generated client classes in the following way:
TestWSXSDService service = new TestWSXSDService_Impl ("http://localhost:13458/TestWSXSD/TestWSXSD?WSDL");
TestWSXSD port = service.getTestWSXSDSoapPort();
Apparently the classes retrieves the WSDL file from the server and this request show up on the TCP/IP Monitor.
However, when I finally executes my request:
port.hello(in);
it's apparently using the endpoint information from the retrieved WSDL file and the request goes to port 7001.
This is the request I want to monitor! Is there a way to make this work with the client classes generated by clientgen or must I make my client in some other way in order to keep a fixed end point against the TCP/IP Monitor?
Thank you.
/John
Edited by johnlindgreen at 08/10/2007 4:51 AM

Hi!
I tried to set the suggested properties both on the client and server side, but as far as I can tell they don't wotk with WLS 10. Maybe I'm doing something wrong?
I tried to serach the documentation and found weblogic.webservice.verbose documented for WLS 8 and weblogic.webservice.client.verbose documented for WLS 9. I couldn't find anything for WLS 10.
But then I re-found something about using a proxy server from a client [url http://edocs.bea.com/wls/docs100/webserv/client.html#proxy_server]. This actually does the trick. So now my code looks like this:
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This keeps the client use my TCP/IP Monitor as endpoint.
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Using wifi on phone with suspended service

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Want to use ibook as faxserver with Vonage Service?

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I recently signed up with Vonage as my phone service where my faxes were coming through okay when I was with At&t. Vonage recommends setting the baud rate of my modem to 9600. Is there a way to slow down the baud rate of my built-in modem? I'm thinking this may be the problem.
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Use of 'static' keyword in synchronized methods. Does it ease concurrency?

Friends,
I have a query regarding the use of 'synchronized' keyword in a programme. This is mainly to check if there's any difference in the use of 'static' keyword for synchronized methods. By default we cannot call two synchronized methods from a programme at the same time. For example, in 'Program1', I am calling two methods, 'display()' and 'update()' both of them are synchronized and the flow is first, 'display()' is called and only when display method exits, it calls the 'update()' method.
But, things seem different, when I added 'static' keyword for 'update()' method as can be seen from 'Program2'. Here, instead of waiting for 'display()' method to finish, 'update()' method is called during the execution of 'display()' method. You can check the output to see the difference.
Does it mean, 'static' keyword has anything to do with synchronizaton?
Appreciate your valuable comments.
1. Program1
public class SynchTest {
     public synchronized void display() {
          try {
               System.out.println("start display:");
               Thread.sleep(7000);
               System.out.println("end display:");
          } catch (InterruptedException e) {
               e.printStackTrace();
     public synchronized void update() {
          try {
               System.out.println("start update:");
               Thread.sleep(2000);
               System.out.println("end update:");
          } catch (InterruptedException e) {
               e.printStackTrace();
     public static void main(String[] args) {
          System.out.println("Synchronized methods test:");
          final SynchTest synchtest = new SynchTest();
          new Thread(new Runnable() {
               public void run() {
                    synchtest.display();
          }).start();
          new Thread(new Runnable() {
               public void run() {
                    synchtest.update();
          }).start();
Output:
Synchronized methods test:
start display:
end display:
start update:
end update:
2. Program2
package camel.java.thread;
public class SynchTest {
     public synchronized void display() {
          try {
               System.out.println("start display:");
               Thread.sleep(7000);
               System.out.println("end display:");
          } catch (InterruptedException e) {
               e.printStackTrace();
     public static synchronized void update() {
          try {
               System.out.println("start update:");
               Thread.sleep(2000);
               System.out.println("end update:");
          } catch (InterruptedException e) {
               e.printStackTrace();
     public static void main(String[] args) {
          System.out.println("Synchronized methods test:");
          final SynchTest synchtest = new SynchTest();
          new Thread(new Runnable() {
               public void run() {
                    synchtest.display();
          }).start();
          new Thread(new Runnable() {
               public void run() {
                    synchtest.update();
          }).start();
Output:
Synchronized methods test:
start display:
start update:end update:
end display:

the synchronized method obtain the lock from the current instance while static synchronized method obtain the lock from the class
Below is some code for u to have better understanding
package facado.collab;
public class TestSync {
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               public void run() {
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          }).start();
          try {
               Thread.sleep(3000);
          } catch (InterruptedException e) {
               e.printStackTrace();
          new Thread(new Runnable(){
               public void run() {
                    sync1.staticAdd();
          }).start();
          new Thread(new Runnable(){
               public void run() {
                    sync2.staticUpdate();
          }).start();
}

Object or Statement Block locking using synchronized keyword in java

Hi ,
Can anyone tell me how java is implementing the Object locking and the code block locking mechanism using the 'synchronized' keyword internally??
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The JVM implements a concept known as a monitor using a combination of direct implementation and support by the operating system. For more detail, refer to the Java JVM and language specifications.
Chuck

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Hi All,,
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method calls from the windows to a separate layer, which would manage
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Babylon Software Pty Ltd

Hello Kevin,
Normally, it has been corrected from the last public release 2.
Hope this helps.
Daniel Nguyen
Kevin Klein wrote:
>
We had a similar problem. We reported the problem to Forte technical
support and they determined that it is a bug. I don't know if this has been
fixed in the 3.0.F release.
The Stopwatch seems to be accurate for long (several second) intervals, but
it can't be trusted for measuring short intervals.
Kevin Klein
Millennium Partners, Inc.
-----Original Message-----
From: [email protected] <[email protected]>
To: [email protected] <[email protected]>
Date: Tuesday, December 30, 1997 1:40 PM
Subject: The Forte Stopwatch
All,
At our site we are using Windows NT 4.0 clients and a Windows NT
Server with Forte 3.0.E.0.
Periodically, we use the Forte StopWatch class to measure durations for
access to data. We've noticed
a strange phenomenon, and we're not sure if it's simply circumstance or if
there's a problem. All of the
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contain either a 0 or a 9 in the
tenth-of-a-second position. For example, values of 1011 and 1912. Has
anybody noticed this?
Thank you,
Keith
Name: Kevin Klein.vcf
Part 1.2 Type: text/x-vcard
Encoding: 7bit

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Not sure i answered your question.
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Use ReportBuilder 1.0 with SQL 2012

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one business partner of us neede Report Builder 1 with Reproting Service 2012.
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