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From "Guillaume Nodet (JIRA)" <j...@apache.org>
Subject [jira] Created: (GERONIMO-4584) Opening an IMAP folder with *logs* of emails is very expensive in terms of memory and cpu
Date Thu, 12 Mar 2009 10:30:50 GMT
Opening an IMAP folder with *logs* of emails is very expensive in terms of memory and cpu
-----------------------------------------------------------------------------------------

                 Key: GERONIMO-4584
                 URL: https://issues.apache.org/jira/browse/GERONIMO-4584
             Project: Geronimo
          Issue Type: Bug
      Security Level: public (Regular issues)
          Components: mail
            Reporter: Guillaume Nodet
            Priority: Minor


{code}
                // this is a real pain, but because we need to track updates 
                // to message sequence numbers while the folder is open, the 
                // messages list needs to be populated with Message objects 
                // to keep track of things.  The IMAPMessage objects will not 
                // retrieve information from the server until required, so they're
                // relatively lightweight at this point. 
                populateMessageCache(); 
{code}
{code}
    /**
     * Populate the message cache with dummy messages, ensuring we're filled 
     * up to the server-reported number of messages. 
     * 
     * @exception MessagingException
     */
    protected void populateMessageCache() {
        // spin through the server-reported number of messages and add a dummy one to 
        // the cache.  The message number is assigned from the id counter, the 
        // sequence number is the cache position + 1. 
        for (int i = messages.size(); i < maxSequenceNumber; i++) {
            messages.add(new IMAPMessage(this, ((IMAPStore)store), nextMessageID++, i+1));
 
        }
    }
{code}

The above code comes from http://svn.apache.org/repos/asf/geronimo/javamail/trunk/geronimo-javamail_1.4/geronimo-javamail_1.4_provider/src/main/java/org/apache/geronimo/javamail/store/imap/IMAPFolder.java.

When trying to open my gmail account using IMAP, this takes a long time and an enormous amount
of memory (500 Mb) just to open the folder.
It might be a good idea to revisit this code if possible.

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