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https://issues.apache.org/jira/browse/JAMES-808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12538207
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Robert Burrell Donkin commented on JAMES-808:
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#1 Mailbox is not an IMAP backend but is intended to be a general Mail backend.
This has advantages (the JSieve filtering is cool) and disadvantages (the
current API sucks for IMAP) but this is a collective use case decision made by
the JAMES team. That's why I suggested moving this discussion to the list.
When I started to work on the IMAP implementation, I definitely felt that this
restriction would limit the ability to create a usable IMAP implementation.
Now, I think that it is possible though the price is some increased complexity
and much more opaque design.
Understanding the structure of a mail without loading it completely is a
reasonable general requirement. MessageResults could expose the general
structure (allowing BODYSTRUCTURE etc) as objects without just caching the IMAP
specific string value.
> Fetch command is not very efficient
> -----------------------------------
>
> Key: JAMES-808
> URL: https://issues.apache.org/jira/browse/JAMES-808
> Project: James
> Issue Type: Improvement
> Components: IMAPServer
> Affects Versions: Trunk
> Reporter: Zsombor Gegesy
> Assignee: Robert Burrell Donkin
> Fix For: Trunk
>
> Attachments: opt.patch
>
>
> Currently the implementation of the FETCH command is not very efficient. For
> example to retrieve one mail the following conversions will happens:
> 1, the backend creates a MimeMessage from a file/database blob/thin air/etc
> 2, the frontend converts into a byte array, with correct CRLF line endings.
> (I don't get, why it's needed, every incoming MimeMessage is already in this
> format, isn't it ?)
> 3, the frontend appends it into a StringBuffer in the FetchCommand class
> 4, after some String manipulation it gets sent over an InternetPrintWriter
> which checks also that all line endings in correct style.
> I'm not sure that the whole thing is absolutly necessary. There is two other
> problem with the current code :
> 1, it doesn't calculate the correct MessageResult flags, so the backend cant
> optimize out the unnecessary things.
> 2, It doesn't parse the BODY[]<0.1024> style commands.
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