Global shared memory

Question

hi all,
im need to maintain some data insideEJB container which will be frequently accesed by almost all of my application components. Like Global Shared Memory (GSM) in C++, is there any way of maintaining this data im memory since the application is performance critical .
Most of my components are session and message driver beans,. Any component should access , the above mentioned common data and should be done without performance (speed) drawback .
Please help me in this matter , as this is of utmost importance in the application design .
Also suggest me some web links on the topic .

Answer 1

If you are going to keep in temporary basis for one transaction, then you can keep the data in Java Bean object. You can put your data in a collection object and set it on the JavaBean object. Make sure the instance of the Java Bean object should be sent to each EJB so that they all will be referring to the same bean instance. Otherwise you will not get the data.
If you want keep it for long, let's say for the session, then put the data in Stateful session bean. Make this session bean local so that other EJBs can access data locally rather making remote calls. You may use SessionFacade pattern to control the transaction properly.
Hope this answers your question.
Thanks