Hi all,
I'm studying how to integrate dnsjnio [1] into jSPF to enable
asynchronous lookup for spf records.
I plan to start a branch in jSPF for this as soon as I'll have the time
to play with it a bit more.
dnsjnio provides asynchronous lookup by 2 means:
lookup(request, ResponseListener)
that returns soon and call the listener as soon as the result is available.
lookup(request, id, ResponsePool)
that will simply place the response in the responsepool identifying it
with an id.
jSPF currently needs asynchronous dns lookups in many cases:
1) retrieve the spf record for a given domain
2) run checks: most mechanisms/modifiers require dns lookups
3) expand macros: sometimes it needs to expand the "client domain" macro
and this require a dns lookup (the first time).
The current public interface to jSPF lookups is:
---
public SPFResult checkSPF(String ipAddress, String mailFrom, String
hostName) {
---
What is the most common interface for asynchronous result ?
1) return SPFResultFuture ?
2) provide a ResponseListener ?
3) require a ResponsePool to be filled with the reply?
Have you any hint before I start looking into this issue?
Stefano
[1] http://sourceforge.net/projects/dnsjnio/
[2]
http://blog.nominet.org.uk/tech/2006/08/08/nonblocking-extensions-to-dnsjava/
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