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https://issues.apache.org/jira/browse/JAMES-1440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13640213#comment-13640213
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Yin,Shiwu commented on JAMES-1440:
----------------------------------
hi, Eric
I met the same issue. Using JavaMail API with IMPA protocol, But it consumed
5s time to open INBOX mailbox that there are only 1000 mails in INBOX. I looked
at the code and found some clues as follows:
org.apache.james.imap.processor.base.SelectedMailboxImpl
private void init() throws MailboxException {
...
synchronized (this) {
while(messages.hasNext()) {
MessageResult mr = messages.next();
applicableFlags.add(mr.getFlags());
add(mr.getUid());
}
...
}
In the loop, Invoking getFlags method will costs about 5ms every time. in
AbstractJPAMessage class, I found userFlags is a lazy-load strategy, which is
the root cause.
org.apache.james.mailbox.jpa.mail.model.openjpa.AbstractJPAMessage
@OneToMany(cascade = CascadeType.ALL, fetch=FetchType.LAZY)
@OrderBy("id")
@ElementJoinColumns({@ElementJoinColumn(name="MAILBOX_ID",
referencedColumnName="MAILBOX_ID"),
@ElementJoinColumn(name="MAIL_UID", referencedColumnName="MAIL_UID")})
private List<JPAUserFlag> userFlags;
> Imap receive mail when there are many mails
> --------------------------------------------
>
> Key: JAMES-1440
> URL: https://issues.apache.org/jira/browse/JAMES-1440
> Project: James Server
> Issue Type: Bug
> Components: IMAPServer
> Affects Versions: 3.0-beta4
> Environment: linux
> Reporter: james
> Labels: IMAP, mail
>
> hi,all
> i have received mail from james that there are 30 thousand mails in
> inbox,using javamail api with imap protocol. But it consumed 22s time to open
> inbox mailbox,just open, not get messages.Then i changed the protocol to
> pop3,it only cost 40ms. Why? Do imap not support good when lagre of mails?
>
>
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