Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

Use existing c++ dll in Web Application

Posted on 2004-09-30
6
178 Views
Last Modified: 2010-03-17
Hi, i have a existing system in c++.
I have Many not thread safe dll´s.
I want to call them from my java web application.

Is there a better way to then use SingleThreadModel and isThreadSafe = "false"?

Is there a better way than copying, renaming and reloading the dll for every user?

I can´t make the dll´s thread safe. this would take me too long. (very much code to check)
the SingleThreadModel would be to slow (yes, i tried it :-( )

creating a new process with Runtime and connect to it with rmi is also too slow (i also tried that :-( )
0
Comment
Question by:Koma666
  • 2
6 Comments
 
LVL 13

Expert Comment

by:petmagdy
ID: 12326662
Hello I have a suggestion that may help:

1- Create a Single Tone Java Class to wrap the Native DLL APIs and make all the methods synchronized

the single tone class looks like this:

class MySingleTone
{
 
  private static MySingleTone instance = null;

  private MySingleTone()
  {
     // Initialize
  }
 
   public static MySingleTone getInstance()
   {
     if(instance == null)
     {
        instance = MySingleTone();
     }
     return instance;
   }

   public synchronized callDllMethod()
   {
     // call ur DLL functions
   }

}
0
 
LVL 5

Author Comment

by:Koma666
ID: 12562995
I can´t do that.
The dll has to be initiated for every user.
It´ll crash if i use one instance for all users.
0
 
LVL 5

Author Comment

by:Koma666
ID: 12563007
I found a way
I found a way to speed up the single thread model by using more cach funktions.
So it´s not the best way but it´s fast enough to use it.
0
 

Accepted Solution

by:
modulo earned 0 total points
ID: 12573297
PAQed with points refunded (250)

modulo
Community Support Moderator
0

Featured Post

Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Convert websphere application server default chained Certificates from 1024 to 2048 keysize or higher size and also you can change signatureAlgorithm . Please make sure Websphere Application Server fixpack 7.0.0.23 or Above. The following steps a…
Meet the world's only “Transparent Cloud™” from Superb Internet Corporation. Now, you can experience firsthand a cloud platform that consistently outperforms Amazon Web Services (AWS), IBM’s Softlayer, and Microsoft’s Azure when it comes to CPU and …
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…

839 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question