Isolation Problem (serializability)

[John Decker]

Hi,

My Weblogic server is connecting to a remote (third party) machine using
a SSLSocket.
Through this socket connection, it sends a HTTP Post request and it listens
for the answer.

For each user in my Weblogic server, I need to send a HTTP Post request and
listen for its
corresponding answer (1 to 1 relationship).

The socket is opened by a Bean contained in a JSP (with an application scope).

Each user invokes the JSP page and uses this Bean.
I'm afraid that when multiple users start invoking the JSP the requests and
responses might get all mixed up. (You could call this a "Isolation or serializability"
problem).

How does the socket know that a specific response corresponds to a certain
request (both associated to the same user) when multiple users are using
the Bean?

Does the EJB specification provide any way to achieve this?

Thanks in advance for your ideas

[Kingshuk]

Hi John
I did not understand whether you are using a java bean or an ejb.
In both the cases however the easier solution is to provide a separate socket
for each thread.

So if its a java bean AND if you are using one single instance of the java
bean for all requests then create the socket in the method ( instead of making
it a member variable ) , thus making it visible only to the executing thread
and no one else. Once you obtain the response , before returning from the
method you will have to close the socket , so in this way there will be no
problem of intermixed responses.


If its an EJB , making it a stateless session bean is probably one solution
. Every thread will invoke create a method to create the bean and then invoke
the method , the method in turn will create the socket and the socket will
be visible only to the currently executing thread , once again no problem
with interleaving.

Hope this helps

Kingshuk



"John Decker" <john@javacontractor.com> wrote:
>
>Hi,
>
>My Weblogic server is connecting to a remote (third party) machine using
>a SSLSocket.
>Through this socket connection, it sends a HTTP Post request and it listens
>for the answer.
>
>For each user in my Weblogic server, I need to send a HTTP Post request
and
>listen for its
>corresponding answer (1 to 1 relationship).
>
>The socket is opened by a Bean contained in a JSP (with an application scope).
>
>Each user invokes the JSP page and uses this Bean.
>I'm afraid that when multiple users start invoking the JSP the requests
and
>responses might get all mixed up. (You could call this a "Isolation or serializability"
>problem).
>
>How does the socket know that a specific response corresponds to a certain
>request (both associated to the same user) when multiple users are using
>the Bean?
>
>Does the EJB specification provide any way to achieve this?
>
>Thanks in advance for your ideas