Re: Asynchroneous calls EJB -> EJB

[Murthy, A (CAP, GEFA, Contractor)]

Could any one please tell me what exactly the work of JMS? when do we need
to use JMS in our applications? is it mandatory to use it with in our
Application Servers?

Murthy A Suryanarayana
GE Financial Assurance
LTC - OPS2000 Project
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-----Original Message-----
From: Rick Hansen [mailto:[EMAIL PROTECTED]]
Sent: Thursday, August 24, 2000 6:18 AM
To: [EMAIL PROTECTED]
Subject: Re: Asynchroneous calls EJB -> EJB


I am not an expert, but I beleive that you need to use JMS (Java Messaging
Services) for any asynchronous communications.

Rick Hansen

>-----Original Message-----
>From: Kaj Bjurman [mailto:[EMAIL PROTECTED]]
>Sent: Thursday, August 24, 2000 2:41 AM
>To: [EMAIL PROTECTED]
>Subject: Asynchroneous calls EJB -> EJB
>
>
>Hi,
>
>Thank you all for the input on my question regarding EJB
>accessing/using
>files...
>
>I have yet another question...
>Is it possible to perform an asynchroneous call from an EJB to
>another EJB.
>
>Lets say that I have a session bean which has the method:
>public JobID calculateInterest()
>
>And when that method runs it will call, calculate() on
>different types of
>EJBs. Each type will be able to calculate interest using different
>algorithms (and each calculation will be an lengthy operation)
>
>Now I would like to implement calculateInterest as (in pseudo):
>
>public JobID calculateInterest() {
>   JobID jobId = ... // get a new id
>
>   //get an array of stateless session beans, which can calculate
>   //different types of interest.
>   CalculatingBean[] calcBeans = new ......
>
>   //Store jobId and beans in a hashtable or something similar.
>
>   //Now start a thread for each bean
>   for (int i=0; i < calcBeans.length; i++) {
>      new Thread() {
>         public void run() {
>            calcBeans[i].calculate();
>         }
>      }.start();
>   }
>   return jobId;
>}
>
>I know that I can't create Threads, so how do you solve such problem in
>EJBs?
>
>
>/Kaj
>
>
>Ps.
>I know that this might look like an odd problem, but I know
>that I will have
>to solve a similar problem in the near future.
>
>
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