Manage concurrency with in memory objects

Hi,
I am not sure whether this is the right forum, how ever thought of putting this in somewhere related to web access.Anyways let me explain
I have a web application which creates employee.There is an employ table which store the details of employees of different departments. The table have an empNo attribute which should be unique for a department.This should be auto generated.
The requirement given was , when the user starts creating the employ the employ number should be displayed on the top of the employ creation page.The employ number should be the next available employ number for that department.
As employ number can be repeated for different departments , i can not use a data base sequence to generate the employ number.So I decided to generate this programmatic , by checking the max employ number for that department from database, when user entering this page.
I would be storing this information at the session level, basically inside the Employ object (a VO).
Now the issue is , when there are concurrent users creating employees for the same department, the concurrent users will have employ object with same employ number in their respective sessions. This will fail when they submit the form to insert into database , as the employ number is unique for same department.
I hope I have explained the scenario clearly. I am pretty much sure that this should not be the way to handle this. Can anybody guide me here for a better logic?
Shaiju

shamili wrote:
The requirement given was , when the user starts creating the employ the employ number should be displayed on the top of the employ creation page.The employ number should be the next available employ number for that department. This is not a good requirement to have. It's not fully specified too. What if a user doesn't save the employee? What happens to the number they had gotten allocated?
As employ number can be repeated for different departments , i can not use a data base sequence to generate the employ number.Some databases allow you to specify a suffix for the sequence.
So I decided to generate this programmatic , by checking the max employ number for that department from database, when user entering this page.
I would be storing this information at the session level, basically inside the Employ object (a VO). The session level is not a good place as you have just seen. You need this to be at application scope level.

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[03/Jun/2005:13:40:41] WARNING ( 2484): CORE3283: stderr:      at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
[03/Jun/2005:13:40:41] WARNING ( 2484): CORE3283: stderr:      at org.apache.catalina.core.StandardWrapperValve.invokeServletService(StandardWrapperValve.java:720)
[03/Jun/2005:13:40:41] WARNING ( 2484): CORE3283: stderr:      at org.apache.catalina.core.StandardWrapperValve.access$000(StandardWrapperValve.java:118)
[03/Jun/2005:13:40:41] WARNING ( 2484): CORE3283: stderr:      at org.apache.catalina.core.StandardWrapperValve$1.run(StandardWrapperValve.java:278)
[03/Jun/2005:13:40:41] WARNING ( 2484): CORE3283: stderr:      at java.security.AccessController.doPrivileged(Native Method)
[03/Jun/2005:13:40:41] WARNING ( 2484): CORE3283: stderr:      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:274)
[03/Jun/2005:13:40:41] WARNING ( 2484): CORE3283: stderr:      at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
[03/Jun/2005:13:40:41] WARNING ( 2484): CORE3283: stderr:      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)
[03/Jun/2005:13:40:41] WARNING ( 2484): CORE3283: stderr:      at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
[03/Jun/2005:13:40:41] WARNING ( 2484): CORE3283: stderr:      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203)
[03/Jun/2005:13:40:41] WARNING ( 2484): CORE3283: stderr:      at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
[03/Jun/2005:13:40:41] WARNING ( 2484): CORE3283: stderr:      at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:158)
[03/Jun/2005:13:40:41] WARNING ( 2484): CORE3283: stderr:      at com.iplanet.ias.web.WebContainer.service(WebContainer.java:598)
Can someone please help to solve this.
Regards,
Sunil

Unfortunately there's not really enough information for anyone to help you much. I can tell you've hit an EOF Exception, but that's about it.
What exactly do you mean by a heavyweight object parameter? Do you mean a large (in memory size) object?
Without any knowledge of your application, I'd probably start by changing your ejb method to do nothing. That should tell you at least whether it's the serialization of the parameter that's the issue or not. Narrow it down from there.
If you need more help, printing the entire stack trace of the EOFException and posting it here would be helpful.
-- Rob

I want to ask something about firefox. why firefox use very much memory? can you develop to reduce memory comsume? this problem is very distrub in my PC with low memory.

I want to ask something about firefox.
why firefox use very much memory?
can you develop to reduce memory comsume?
this problem is very distrub in my PC with low memory.
== This happened ==
Every time Firefox opened

How much memory is Firefox using right now?
# Press '''CTRL+SHIFT+ESC''' to load the Task Manager window
# Click the Processes tab at the top. (Click once near the top of the window if you don't see tab
# Find firefox.exe, and see how many kilobytes of memory it's using.
Showing around 80MB when Firefox first starts is normal. Right now, I have 75 tabs open and it's using 500MB - this varies a lot depending on what you have in the tabs.
Other than high memory usage, what other problems are you experiencing? (Examples include slowness, high CPU usage, and failure to load certain sites)
Many of these issues, including high memory usage, can be caused by misbehaving add-ons. To see if this is the case, try the steps at [[Troubleshooting extensions and themes]]. Outdated plugins are another cause of this issue - you can check for this at http://www.mozilla.com/plugincheck

Enhanced protected mode and global named shared memory object

Good morning.
I've written a bho that do data exchange with a system service. The service creates named shared memory objects in the Global namespace. Outside appcontainer IE 11 sandboxed everything works fine lowering objects integrity level. Inside the sandboxed environment
OpenFileMappingW seems to return a valid handle but the calls to MapViewOfFile always gives access denied. What i'm missing? Thank you.
Service code for security descriptor creation:
if (InitializeSecurityDescriptor(pSA->lpSecurityDescriptor, SECURITY_DESCRIPTOR_REVISION))
if (ConvertStringSecurityDescriptorToSecurityDescriptorW(L"D:P(A;;GA;;;WD)(A;;GA;;;AC)", SDDL_REVISION_1, &pSecDesc, NULL) == TRUE)//
           BOOL fAclPresent = FALSE;
           BOOL fAclDefaulted = FALSE;
           if (GetSecurityDescriptorDacl(pSecDesc, &fAclPresent, &pDacl, &fAclDefaulted) == TRUE)
               bRetval = SetSecurityDescriptorDacl(pSA->lpSecurityDescriptor, TRUE, pDacl, FALSE);
       if (bRetVal ==TRUE && ConvertStringSecurityDescriptorToSecurityDescriptorW(L"S:(ML;;NW;;;LW)", SDDL_REVISION_1, &pSecDesc, NULL) == TRUE)
           BOOL fAclPresent = FALSE;
           BOOL fAclDefaulted = FALSE;
           if (GetSecurityDescriptorSacl(pSecDesc, &fAclPresent, &pSacl, &fAclDefaulted) == TRUE)
               bRetval = SetSecurityDescriptorSacl(pSA->lpSecurityDescriptor, TRUE, pSacl, FALSE);
               OutputDebugStringW(L"SACL ok.");
   return bRetval;
BHO code
LPMEMORYBUFFER OpenDataChannel(HANDLE *hQueue)
   LPMEMORYBUFFER lp = NULL;
   WCHAR data[512] = { 0 };
   for (int a = 0;; a++)
       if(iestatus==FALSE)StringCchPrintfW(data, 512,L"Global\\UrlfilterServiceIE.%d", a);//NOT in EPM
       else StringCchPrintfW(data, 512, L"%s\\Global\\UrlfilterServiceIE.%d",appcontainernamedobjectpath, a);//in EPM
       *hQueue = OpenFileMappingW(FILE_MAP_ALL_ACCESS, TRUE, data);//FILE_MAP_ALL_ACCESS
       if (*hQueue != NULL)
           //file mappato esistente
           lp = (LPMEMORYBUFFER)MapViewOfFile(*hQueue, FILE_MAP_ALL_ACCESS, 0, 0, sizeof(MEMORYBUFFER));//FILE_MAP_ALL_ACCESS
           if (lp != NULL)

Ciao Ritchie, thanks for coming here. ;-)
I call (only) OpenFileMapping and MapViewOfFile inside my code and i get access denied at the first try. As i stated before this happens when IE11 is working inside EPM 32/64bit mode, outside EPM it works as it should. However i decided to take a different
approach to do IPC, because, you want it or not, the service is up and running as SYSTEM... Still i'm really interested about two points:
1) can i use global kernel objects in EPM mode?
2) if one is "yes, you can": what's wrong with my code? The security descriptor? Something else?
Thanks all.

Help with phone memory

i'm using Nokia N73 Music Edition with 2GB memory card. My problem is that sometgime my phone inform that my memory is fuu and need to delete some data. Dont really understand what it mean. I also like to know how to manage my phone memory.

please remove the memory card and then format the unit using code *#7370#.note all ur data in phone ie contacts messges and calendar note u created will be deleted.

H67MA-E45 doesn't start with dual memory channel

I have just bought an H67MA-E45 motherboard and a brand new intel i5-2300 processor.
The pc works fine with a DDR3 1333 memory module on slot DIMM1 (as suggested in the manual),
but does not seem to work with dual memory channel at all.
When I install two same memory modules on DIMM1 and DIMM3 (dual channel configuration), I get the following problem: When I power on the computer, it turns on and instantly turns off. Then it powers on again on its own, but does nothing else. I get no beep error codes and the display doesn't show anything.
I use he on-board display adapter and I have only a sata II hard disk connected, nothing else.
Any suggestion what the problem might be?
Is there a way to check if there is a problem with the second memory channel?
PC details
Intel(R) Core(TM) I5-2300 CPU@280 GHz
MSI H67MA-E45 (ms-7678, Lga1155), Click BIOS, E7678IMS V1.2
KINGSTON KVR1333D3N9K2/4G DDR3 4GB (2X2GB) PC10666 1333MHZ
Intel HD Graphics (on board display adapter)
Seagate Baracuda 7200.9 ST3160811AS 160 GB SATA 2.0
Windows 7 Ultimate 32 bit
FSP AX500-A Blue Storm, +3.3V~30 A +5~28A +12~15A

My computer is now working only on one channel memory.
Every time I power the computer on, I get three short beeps, the third one is of slightly different tone. However, the manual does not have the beep codes written down, nor can I find them somewhere for the EFI BIOS (E7678IMS V1.2). Is there any link for the beep codes?
I tried mounting a single memory slot (KINGSTON KVR1333D3N9K2/2G DDR3 (1X2GB) PC10666 1333MHZ ) on DIMM 3 slot, for the second channel to work on its own. When I powered the computer on, I got the same problem, as if both slots DIMM 1 and DIMM 3 were populated. The mainboard turned on (without any beep code or display on screen) only to instantly turn off. Every while (about every four seconds) it tries to power on again on its own, without any intervention, but instantly turn off again. It may manage to stay turned on at one of the following iterations, without giving any beep code, displaying or loading anything.

(BUG?) Oracle Apps Adapter - Unable to setup Concurrent with no parameter

Hi all.
I'm facing a problem when using Oracle Apps Adapter 10.1.3.1
In JDev Adapter Configuration Module Browser, when I want to configure it to execute a concurrent program that has no input parameter, the Module Browser does not work (the OK button does nothing)
Examples of concurrent with no parameters are:
1) Discrete Manufacturing->Inventory->Material Transaction->Open Interfaces->Inventory Transaction Open Interface->Concurrent Programs->Material Transactions Interface Manager (This one is the main issue I'm facing)
2) Supply Chain Management->Shop Floor Management->Lot Based Job->Open Interfaces->Lot Based Job Open Interface->Concurrent Programs->Manager: Lot Move Transactions
Other concurrents that have parameters all seems to pass in the configuration wizard.
Does any one know about this issue?
Thanks.
Denis

We've already been in conversation with the AppsAdapter developers about this.
Part of the problem is that you have to have NLS_LANG set correctly on your PC. So if the NLS_LANG on your Apps install is US then the PC needs to be set like this also.
I have some documentation which I can forward if you send me your contact details to [email protected]
Not saying that this will solve all your problems, as we found a few with this adapter but hopefully will put you on the right track.

The performance of management system with Java and MySQL

Hi all,
I want to develop one management application with Java and MySQL. However I am not sure which is a good way to design the system. The system has to deal with customers' data in the database.
Should I create objects for every customers when application starts so that I do not need to access to the database often? Or
Should I access to the database everytime the user want to deal with customer's data?
Welcome for any suggestion.
Thank you
Pat

Hi
i i think u should go through MVC model or use connection pooling

Manage concurrency with in memory objects

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