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From Joachim Draeger <jdrae...@gmx.de>
Subject BasicMailboxSession (aka MessageRepository)
Date Sat, 28 Oct 2006 16:51:13 GMT

Hi all!

I guess it is wished that the API for just accessing user inboxes should
stay as easy as possible. 
That's why I'm proposing a separate Interface that only contains core

Just like addUser has been moved from James class to UsersRepository,
getUserInbox could be moved to MailboxManagerProvider (alias

package org.apache.james.mailboxservice;

interface MailboxService {
  BasicMailboxSession getBasicInboxSession(User user);

  /** @param user the authorized User for checking credentials 
      @param mailboxName a logical/hierarchical mailbox name **/ 

  BasicMailboxSession getBasicMailboxSession(
       User user, String mailboxName);


interface BasicMailbox {

    /** @return the key */
    String store(MimeMessage message) throws MessagingException;

    /** @return keys */
    Collection list() throws MessagingException;

    MimeMessage retrieve(String key);

     * key changes by updating
     * @param key the current key
     * @return the new key
    String update(String key, MimeMessage message)
            throws MessagingException;

    void remove(String key)
            throws MessagingException;

interface BasicMailboxSession extends BasicMailbox, MailboxSession {}

public interface MailboxSession {
    public void close();
    public boolean isWriteable();

The main differences to current MailRepository are:

* keys are generated by mailbox
* separate store/update
* sessions have to be explicitly closed. (and not weak referenced and
_maybe_ gc'ed away)
* logical mailbox names that are mapped to physical backends

Okay there is one point that is a bit more difficult: 
ToRepository Mailet, which accepts a url. 
It is used for mail that is not delivered to a user like spam or mail
that can't be delivered.
I guess the ability to put this repositories where ever one wants is
quite popular.
Maybe we could use a logical #system name space here like #system.spam
or #system.address-error.
For example this could be mapped like: #system.* -> file:/var/mail/*

BasicMailboxSession mailboxSession= mailboxService.
       getBasicMailboxSession(User.SMTP, "#system.spam");


1. discussion
2. vote
3. deprecate MailRepository and James.getUserInbox() (not to break
backward compatibility)
4. provide BasicMailbox wrappers around MailRepository 
5. refactor current components to use MailboxService.

What do you think?


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