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Re: [aspectj-dev] using AspectJ to deal with exceptions

thanks, this has been really helpful.
 
Eric Macaulay
----- Original Message -----
From: Ron Bodkin
Sent: Thursday, June 03, 2004 7:46 PM
Subject: Re: [aspectj-dev] using AspectJ to deal with exceptions

Hi Eric,

 

You could certainly use AspectJ to modularize the recovery logic, e.g.,

 

aspect ErrorRecovery {

    pointcut socketCreation(int port) : execution(new ServerSocket(int));

 

    void around(int port) : socketCreation(port) {

        boolean retry = true;

        do {

            try {

                 proceed(port);

                 retry = false;

            } catch (BindException e) {

                 port++;

            }

        } while (retry);

     }

}

 

This has the benefit of separating your error handling strategy from your mainline code (better modularity) and it allows the strategy to be revised and even reused in other places or applications. Admittedly, only typically create server sockets in one place, so there may not be much crosscutting in this case. I.e., you avoid tangling, but there may probably is not much scattering (at least not for a single application).

 

Ron Bodkin

Chief Technology Officer

New Aspects of Software

o: (415) 824-4690

m: (415) 509-2895

 

 

------------Original Message------------

From: "Eric Macaulay" <eeoam@xxxxxxxxx>

To: <aspectj-dev@xxxxxxxxxxx>

Date: Thu, Jun-3-2004 11:25 AM

Subject: [aspectj-dev] using AspectJ to deal with exceptions

I have the following statement:
 
socket = new ServerSocket(port).
 
if java.net.BindException is thrown then then the port is already in which case I wish to increment the port number and try again. I wish to keep this up until either I get a free port or we run out of ports.
 
Can aspectj make this algorithm any easier/elegant to implement than Java?
 
Eric Macaulay