Network variable burden on the server side

I have a project involving communication between two PCs running different data acquisition. PC1 is master and PC2 is the slave and they both run basic LV 2012 SP1. In each test cycle, the master send out parameters via a shared variable to the slave machine, then runs a timing sequence of operations. PC2 will then acquire the data independently. The test cycle is about 20-30s, so the communcation is infrequent and data size is small, and the latency is unimportant. However, since PC1 is running a timing sequence, I don't want PC2's polling increase burden on PC1's CPU.
Currently I'm using NI PSP binded front panel controls and indicators on both PC's VIs, and set PC1 as the server of shared variable. PC1 updates the shared variable every test cycle, and PC2 reads the shared variable control every 100ms. Although, I noticed that the PC2's shared-variable binded control will always update to the new value even if the control is not executed at all.
I have read the post http://forums.ni.com/t5/LabVIEW/Can-I-use-the-timestamp-of-a-Network-published-global-variable/m-p/3068531 about polling variable will not increase the network traffic, but does polling increase the server CPU load?
Edit: a conceptual diagram of server and client are as follows:

Jacob12323 wrote:
I need to connect another application software to calculate. How do you connect to other application software?

Similar Messages

What's wrong about "JSF that emits Ajax-widgets" on the server side?

Hi,
I just read this chat about Ajax on the server side and I wonder what this comment bellow means when we are building JSF application with Ajax:
Another thing to consider is that in a pure Ajax application (i.e. one that's not a hybrid of a server-side technology like JSF that emits Ajax-widgets), the server can pretty much just respond to requests from the Ajax client in a stateless manner, and all of the state gets distributed to the client, greatly reducing the memory resources on the server. I'm working on an app like this for IBM Rational and we're really excited about the *decreased* load on the server by distributing state to clients.
http://www.devwebsphere.com/devwebsphere/2006/04/ajax_and_its_im.html
Thanks in advance.

Just created a half an hour ago application:
http://jsfbyexamples.com/facesTrace/
shows that the AJAX request spends less time on the server even it walk though the whole life-cycle. This is a very small page, BTW. On the complicated page, the difference will be more significant. It is about server resources.
About network traffic: Do you actually believe that sending the whole page produces less traffic than the portion updates? Just mathematically speaking?
OK, I guess you mean the AJAX application requires traffic comes back and forward to produce the AJAX functionality. Non-AJAX application does not produce the traffic, but it does not produce the functionality you have in the first case.
People who argue about it just try to compare Something to Nothing. So, where is the point?
Sergey : http://jsfTutorials.net

HTTP SERVICE - How to get the value of my params on the server side

I am new to flex and with the url limitation i was trying to
do the following ....send a bunch of ids... using params variable
var myservice:HTTPService = new HTTPService();
myservice.url = url;
myservice.method = "POST";
myservice.resultFormat = "e4x";
myservice.send(params);
The question is how do i get the value i passed on using
params on the server side? can the variable params be a string or
array or does it have to be object type?
Any help would be greatly appreciated.

Most server side languages have a function or an array where
you extract the variables. in PHP they arrive in global arrays
called $_POST and $_GET.
Other languages have methods like request.formvars or
request.query. Check your serverside language on how that is
done.

When php is the server side language...

Can SQL injection happen to a flash website which uses php as the server side language?
(Highly appreciate your input)

you're welcome.
and, it's easy to prevent using mysql_real_escape_string(): http://www.tizag.com/mysqlTutorial/mysql-php-sql-injection.php
i always use a for-loop to convert all the variables to php variables and while i'm at it, prevent injection:
foreach ($_POST as $key => $value) {
$$key = $value;
$$key = mysql_real_escape_string($$key);

Needs a background webdynpro application running at the server side

Hi All,
We have a requirement wherein we need to have an application running all the time at the server side to capture the response coming from a web application. Based on the response that the application receives, it needs to update some backend R/3 tables.
We are thinking of a webdynpro java application.
Can anyone suggest what kind of application needs to be implemented here?
And what would be the steps required to run the application at the server side without calling the application.
Thanks & Regards,
Anurag

Hi Robin,
Thanks for the detailed explaination.
This may sound silly to you but I've another doubt which is as follows:
As you mentioned that the external web application will be sending requests to our Web service(in SOAP envelopes) and rest of the functionality can be achieved by our web service.
Actually, we are expecting only responses from the external web application. The thing is that we are sending the requests to the external web applications from our custom webdynpro application and in return the web application will be sending us 2 responses.
First response would be back to our WD java application URL(to the browser in which WD java app is running) which would get the response and display some message based on the response.
Second would be to this web service which you have just suggested. We are having two responses so that even if the browser in which the WD java application is running gets accidentally closed, the response from the external web application must get captured somewhere else and should not get lost in any case.
So, now since we are only expecting the response from the web application and we do not want any requests from the web application to our web service; how is this possible?
I am asking the above question because you have mentioned that the external web application has to request our Web service but we want is only this web service to capture the response coming from the Web application.
Or is it like the web application will send us the response string as request string to our Web Service and the web service will capture these response parameters as request parameters from the web application and do the further processing.
But in that case, we do not want any response to be sent by the Web Service to the external web application.
Please suggest if this is possible.
Once again, many thanks for the help so far.
Thanks & Regards,
Anurag

Bw web report plugin http session hangs at the server side

Hi,
I am having problems when closing the browser of a BW web report. After I closed the browser by going File->close, I ran SM04 and found out the Plugin HTTP session hangs at the server side.
How can we terminate the Plugin HTTP session at the server side when user closes the internet browser?
I did implement a logoff function at my web template, if user clicks on the logoff, the Plugin HTTP session is terminated at server side correctly. But As you know, 50% of time user will close the report by closing the internet browser instead of clicking the logoff. That leaves lots of hanging Plugin HTTP sessions at our server side.
By the way, we actived our BEX service at the SICF.
Thanks for help!
JA

Hi
If you want to avoid a blank page with logoff button, add opener=0
<a href="<SAP_BW_URL CMD='LOG_OFF' ~command='logoff'
>" onClick="javascript:window.close(opener=0);">Log off</a>
If you want to close the session via X, use this code:
create a sapscript function
function closeSession()
logoff()
window.unload=CloseSession()
However, the Plugin HTTP session isn't killed.
Regards

How can I disable excel addin on the Server side?

Hi, is there any way to disable excel addin on the server side?
We want to disable it so that no one can modify or read data in the cube in the production environment, even if he or she had installed the add in. Instead, we provide the Planning data forms as the only interface for end-users to read and write. we do this because the add in is very easy to install and users can read and write data in the cube at their will.
As we designed to keep the security filters simple, it is not a good idea to controll data access through security filters.
so, what i'm asking is how to disable excel addin on the server side?
Thank you for replying.
Edited by: user4592285 on 2012-10-18 上午6:48

Hi,
As Gurus suggested, you will have to restrict viewing of data through dimension level security.
Give access of members to users, only which are relevant to users so that they can't view other user's data/members.
Like give access of members belonging to HR dept only to HR users and give access of Finance dept related members to finance users only.
Hence HR users will view only HR relevant data and won't be able to view (read or write) finance related data and vice-sa-versa.
Hope this helps
Regards
-SM
Edited by: 918547 on Oct 18, 2012 8:40 PM

How to delete the server side sessions

Hi All,
I have a wireless application and it is accessed through ptg/rm gateway from a PDA browser. Oracle wireless AS gives default login page (when the application is accessed through ptg/rm gateway) and when user login, user information session might get stored in server side (I am not sure, if any one can pls clarify me on this also?).
Now i have a requirement, in which my application user should get 'logoff' button in each and every page of my application. When he clicks on this button the user information session should get invalidated, so that even if the user goes back to the application (using back button of the browser) he should not able to enter the application. (This is same as any std. login/logout page logic).
Invalidating the session which resides in client side is easy (By using session.invalide()), but how can i delete the session which resides on the server side??? Whether is it possible??
If yes then how can i do it.
Any help will be very usefull.
Thanks well in adavance.
Shrikant

Shrikant:
Shouldn't it be easy to invalidate the server sided sessions? Right before invalidating the client side session, send a message to the server, which should call its session.invalidate() after it has obtained the current session. If desired, a message can be sent back to the browser informing user that server side session has been deleted.

How to access a JS changed attribute on the server side?

hi all;
if i change an attribute on a custom component via java script on the client side.
how can i access the changed value on the server side?
in what method will i have the access to this changed field?
thanks in advance.

You can hardcode the ID of the component in the backingbean (or some propertiesfile) and use ViewRoot.findComponent(componentId). Using the binding is (much!) more elegant anyway.

Error getting the server-side naming service functionality

Hi all,
we are currently setting up the CTS+ activity based transport scenario. Everything seems to be working fine, however, we have to import each transport twice...
Before I go into detail in the error we get I will first describe our landscape. All the configuration we did was done in debate with SAP.
We use the SAP Solution manager (ehp1 SP 4) as the CTS+ server as recommended by SAP and have an NWDI system of which we only use the components DTR and CBS (since CMS is not used anymore in the activity based transport). We have defined three logical ports/RFCs. CTSCONFIG points to the NWDI system. CTSDEPLOY is running on the java stack of the solution manager and is only used for portal content (=epa) transports. CTSDEPLOY_DI is pointing to the NWDI system and is used for all NWDI (=dip) changes. The NWDI is running ehp1 SP3.
In STMS I defined all the non-abap systems (and configured them to use CTSDEPLOY_DI) and created the following transport route:
upload system (IMP) -> DEV -> ACC -> QAS -> PRD
I first attached the used dependencies in a transport request (SAP_BUILDT, EP_BUILDT, etc) these imported just fine. Then I did the SCA files which contain our custom code. I extracted these from the assemble step on our current NWDI system which will be removed as soon as we switch to the new CTS+ environment.
When we import the transport into the runtime systems then we see the DTR and CBS be filled sucesfully for this specific system. However, the transport request itself always fails with errorcode 12 and the error is:
Error during export service registration: Error getting the server-side naming service functionality during getInitialContext opera
tion. com.sap.engine.services.jndi.persistent.exceptions.NamingException: Error getting the server-side naming service functionality during getInitialContext operation.
Error in execution of Web services CTSDEPLOY_DI , exception is cx_cts_file_import_failed
File import canceled
When we then reimport the same transport it will go the second time fine. This is no problem during the setup but will not be workable when we go live ofcourse. Is there anyone who had this issue before as well and have a solution for it?
Kind Regards,
Nico van der Linden...

Hello Nico,
I would need the java trace files to get more info on this issue, but you can start troubleshooting this error with these notes:
#1172252: CTS+, 'attach file': Troubleshooting Guide;
#1003674: Enhancement for non-ABAP systems in CTS;
#1155884: CTS+, configuration 'close coupling': Troubleshooting guide;
Pay special attention to parameter NON_ABAP_WBO_CLIENT, whether it's correctly set on your CTS+ system(s).
Note #1003674 is a must for any CTS+ systems to work properly, as well as having an updated version of the transport programs (tp and R3trans).
Lastly, note #1155884 goes through some JCoException exceptions that commonly take place during CTS+ transports. But again, you need to check the underlying trace files to find the root cause of your issue.
I hope this information helps.
Best regards,
Tomas Black

Is it possible to downsize a large image on the server side (before serving it to the user)?

One of the banes of my existence is resizing the same image several times because of the various contexts it appears in. For example, the main image in an article will appear bigger than it will on the index page, where many article teasers are placed. Then there's the image that goes in the Facebook "share" og. Then there's... you get the idea.
Same image, different contexts, lots of Photoshop resizing, lots of files to keep track of... but I save on bandwidth.
On the flip side, I can target the same (large) image and simply downsize via traditional HTML (width/height) on the browser end, but that will mean downloading a file that is 50-75% larger than what is actually needed. If the front page teaser displays a 1280px image at 500px, that's a huge (and potentially costly) waste of bandwidth.
HOWEVER...
If I could do the same thing on the SERVER side... in other words, tell the server to take only the pixels it needs from the (large) image and serve only THOSE to the end user... then the same image could be used in each and every context, and only the necessary bandwidth is used.
Is this do-able? If so, what is the process formally called, and where would I begin to learn how to do it?
Thanks!

That's amazing. I didn't think it was possible without saving files on the server first.
This will suit my needs just fine, but allow me to push my luck even further with the following "hail mary" question : would it be possible for the server to serve the PNG with a width of 100% of the container? In other words, the behavior would mimic width=100% but the server would still only serve as many bytes as are needed to fill that space.
Not only would I not have to create separate files for every resize (we fixed that problem with your suggestion) but I wouldn't even have to customize every link to a specific size.
I'm not expecting an affirmative on this one, but it was worth asking. =)

Sing a PDF document on the server side

Hi all, i make on the server side a pdf document automaticly with php. Now I want make an script or a programm that automaticly signs my pdf dokumets.
Do anyone know more about this scripts or programms in Java, that is running on a server?
Best regards
Nikolay

When I sing, it is usually Girls On Film or Hungry Like The Wolf but I know that Percy Blakney has a fondness for Haircut 100.
Hope That Helps.
Oh, and by the way, try doing a search on Google. You'll get quite a few results back for Java and PDF, tovarisch.

How do I send a raw (push) notification from the server side using an Azure mobile service?

Hi there!
Currently I'm able to send toast notifications to my user from my Azure mobile service using the following line of code in one of my server side scripts:
push.wns.send(opponent_id, payload, 'wns/toast', {
success: function(pushResponse) {
console.log("Sent push:", pushResponse);
request.respond(statusCodes.OK, {});
error: function(pushResponse) {
console.log("Error Sending push:", pushResponse);
request.respond(500, { error: pushResponse });
But I would like to send a raw notification to my user now, not a toast notification. I've set up a background tasks which runs as soon as a raw notification arrives(I've tested this through the diagnose option of my mobileservicehub and it works).
I want to send a raw notification now from the server side and I'm kind off lost on how to do that. I've looked for it but can't seem to find an answer to that question, I might be looking for the wrong stuff though.
I'm looking for a solution that looks the same as the one for a toast notification(as demonstrated in the code above).
Your help would be greatly appreciated!
Thanks in advance!
Jan

I found the solution to this it was in fact really really easy, I should have read the documentation more properly since it clearly said that the payload for raw notifications could be literally anything but the client has to take care of it.
So I figured that out!

The query locator has timed out on the server side.

Hi
I am getting the error:The query locator has timed out on the server side.
What to do now?
AG

Hi
Are you using Salesforce.com for creating reports?
When joining large-sized tables, you may run into a query locator time out
error. The query locator is a server-side cursor generated by Salesforce.com
and is used to navigate the query result. It will automatically expire in 15
minutes without any activity.
In the case of joining two tables, the report processing engine will read one
table partly, and then it will process the other table. If the processing time is
longer than 15 minutes, the Crystal Reports Salesforce.com Driver will try to
read the rest of the records in the first table and the cursor in that query will
time out. In the case of joining multiple tables, the chance of running into a
query locator time issue is higher as the report processing engine might have
to return to handle the first table after finishing processing other tables,
increasing the possibility of a query locator time out error in the first table.
If you run into query locator time out issue, we recommend that you add
filters into your report to reduce the amount of records you fetch from
Salesforce.com.
However, if that is not possible, you can try to reverse the link order in the
case of joining two tables. For example, you linked table A to table B, then
you can try to link table B to table A.
Hope this helps!!
Regards
Sourashree

Servlets store information on the server side?

i am working on a tapestry web app.
is there a way for servlets to store some information on the server side independently. like a http session is visible to only the user who is viewing it, somebody else cannot view somebody elses http session details. but is there a way to share some common information inbetween all user sessions/pages. i dont want to store any info within the db but somewhere within tomcat.
i hope i am able to express my question properly.

I am a little confused when you say:
A user logs onto the server and a new web application is started for him then another user logs on from another place and a new web application is started for that user.
If they are hitting the same servlet in the same context (directory under your root webapps folder) then there is one web application. Each user is just starting a new session in that one web application. Each user is not creating a new web application.
That being said, and if it is true (all the users are using the same servlets) then you should use the ServletContext to store data you want to share between users. That is what it is designed for. In Servlets (and JSPs) you can talk about four different scopes where data gets stored in a particular application:
1) The 'page' scope is relevant only to JSPs, and represents data that is visible only to the current JSP page for the current user. The object used is called PageContext.
2) The 'request' scope stores data available to all servlets accessed by a single user through a single request (so if forwards, or includes are used to get from one servlet to another). The ServletRequest object is used to store this data.
3) The 'session' scope stores data available to a single user across multiple requests. The HttpSession object stores this info.
4) The 'application' scope stores data available to all users across all requests. The ServletContext object stores this info.
All of the scopes have data stored/retrieved via setAttribute(key,value) and getAttribute(key) methods.
"cant i maintain a list of users who are generating or viewing a web app from my server at any instance"
Yes you can. I would use a SessionListener to listen for when new sessions are created. When they are get the information you need and add them to a list in the ServletContext where all users can see it. Then in the SessionListener listen for when a session is destroyed, and remove the user from the list.

Network variable burden on the server side

Similar Messages

Maybe you are looking for