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package com.sun.mail.imap;
import java.io.IOException;
import java.nio.*;
import java.nio.channels.*;
import java.util.*;
import java.util.logging.*;
import java.util.concurrent.ConcurrentLinkedQueue;
import javax.mail.*;
import com.sun.mail.util.MailLogger;
/*
can only do select on SocketChannels, so need a SocketFactory that returns
Sockets implemented on top of SocketChannels. ARGH!!!
user needs to call watch(Folder) after doing anything with the folder
*/
// XXX - add logging
public class IdleManager implements Runnable {
private Selector selector;
private MailLogger logger;
private volatile boolean die = false;
private Queue toWatch = new ConcurrentLinkedQueue();
public IdleManager(Session session) throws IOException {
logger = new MailLogger(this.getClass(), "DEBUG IMAP", session);
selector = Selector.open();
}
public synchronized void watch(Folder f)
throws IOException, MessagingException {
if (!(f instanceof IMAPFolder))
throw new MessagingException("Can only watch IMAP folders");
IMAPFolder folder = (IMAPFolder)f;
SocketChannel sc = folder.getChannel();
if (sc == null)
throw new MessagingException("Folder is not using SocketChannels");
logger.log(Level.FINEST, "IdleManager watching {0}", folder);
logger.finest("ADD");
toWatch.add(folder);
logger.finest("WAKEUP");
selector.wakeup();
logger.finest("RETURN");
}
//@Override
public void run() {
die = false;
try {
for (;;) {
try {
for (;;) {
IMAPFolder folder = toWatch.remove();
logger.log(Level.FINEST,
"IdleManager adding {0} to selector", folder);
SocketChannel sc = folder.getChannel();
if (sc == null)
continue; // XXX - should never happen
try {
folder.startIdle();
sc.configureBlocking(false);
sc.register(selector, SelectionKey.OP_READ, folder);
} catch (MessagingException ex) {
// something went wrong, don't watch this folder
logger.log(Level.FINE,
"IdleManager got exception for folder: " +
folder, ex);
}
}
} catch (NoSuchElementException ex) {
// no more elements in the queue
}
logger.finest("IdleManager waiting...");
int ns = selector.select();
if (logger.isLoggable(Level.FINEST))
logger.log(Level.FINEST,
"IdleManager selected {0} channels", ns);
if (die) {
logger.fine("IdleManager exiting");
return;
}
Set selectedKeys = selector.selectedKeys();
for (SelectionKey sk : selectedKeys) {
selectedKeys.remove(sk);
IMAPFolder folder = (IMAPFolder)sk.attachment();
logger.log(Level.FINE,
"IdleManager selected folder: {0}", folder);
SelectableChannel sc = sk.channel();
sc.configureBlocking(true);
try {
if (!folder.handleIdle(false)) {
logger.log(Level.FINE,
"IdleManager done watching folder {0}", folder);
// done watching this folder,
// remove it from the selector
sk.cancel();
}
} catch (MessagingException ex) {
// something went wrong, stop watching this folder
logger.log(Level.FINE,
"IdleManager got exception for folder: " + folder,
ex);
sk.cancel();
}
sc.configureBlocking(false);
}
}
} catch (IOException ex) {
logger.log(Level.FINE, "IdleManager got exception", ex);
}
}
public synchronized void stop() {
die = true;
logger.finest("IdleManager stopping");
selector.wakeup();
// XXX - close selector and clean up everything?
}
}
