chibenwa commented on code in PR #2817:
URL: https://github.com/apache/james-project/pull/2817#discussion_r2376110192


##########
server/protocols/webadmin/webadmin-mailbox/src/main/java/org/apache/james/webadmin/service/UserMailboxesService.java:
##########
@@ -213,4 +226,63 @@ private Stream<MailboxMetaData> 
listUserMailboxes(MailboxSession mailboxSession)
             .toStream();
     }
 
+    public Mono<Result> runRulesOnMailbox(Username username, MailboxName 
mailboxName, Rules rules, RunRulesOnMailboxTask.Context context) {
+        MailboxSession mailboxSession = 
mailboxManager.createSystemSession(username);
+        RuleMatcher ruleMatcher = new RuleMatcher(rules.getRules());
+
+        return 
Mono.from(mailboxManager.getMailboxReactive(MailboxPath.forUser(username, 
mailboxName.asString()), mailboxSession))
+            .flatMapMany(messageManager -> 
Flux.from(messageManager.getMessagesReactive(MessageRange.all(), 
FetchGroup.HEADERS, mailboxSession))
+                .concatMap(Throwing.function(messageResult -> 
runRulesOnMessage(ruleMatcher, messageResult, mailboxSession, context))))

Review Comment:
   IMO that's maybe a bit harsh
   
   We could `flatmap` + `LOW_CONCURRENCY` ?



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