[jboss-dev-forums] [Design of Messaging on JBoss (Messaging/JBoss)] - Re: Large Messages and the JMS Bridge

[clebert.suconic@jboss.com]

We had a relevant conversation about this today on the IRC, and I wanted to keep a record of it here:

"Clebert, Andy and Jeff on IRC" wrote : 
  | (10:15:18 AM) clebert: Cache on LargeMessage
  | (10:15:24 AM) clebert: the way I implemented is...
  | (10:15:34 AM) clebert: I added a new attribute on the SessionFactory and ConnectionFactory
  | (10:15:42 AM) clebert: cacheLargeMessageClient
  | (10:15:45 AM) clebert: with default = false
  | (10:16:07 AM) clebert: if that is set, the LargeMessageBuffer will use a temporary file (on the TempDir) to hold on the large message content
  | (10:16:19 AM) clebert: tempDir = File.createTempFile()
  | (10:16:29 AM) clebert: the file is marked to be deleted after exit
  | (10:16:36 AM) clebert: and finalize will also delete the temp file
  | (10:16:48 AM) clebert: that will be probably used only on the bridge... or if the user needs it
  | (10:16:58 AM) clebert: I only need to document it now
  | (10:17:07 AM) AndyTaylor: clebert: so the message will stay in temp for the user to obtain
  | (10:17:30 AM) clebert: AndyTaylor: LargeMessages are usually a stream of packets...
  | (10:17:35 AM) clebert: if that property is true...
  | (10:17:39 AM) clebert: there will be a file on the client...
  | (10:17:48 AM) clebert: so if the user moves the buffer back, it will recover the content from the file
  | (10:18:05 AM) clebert: otherwise it' s not possible to move a largemessage buffer back, since it would be a streaming otherwise
  | (10:18:12 AM) AndyTaylor: clebert: ok i see.
  | (10:18:22 AM) jmesnil: clebert: do you think it is worth to have a example with a cached large message?
  | (10:19:05 AM) clebert: jmesnil: I' m not sure... I would prefer users not using that feature... only letting it for cases where you need to cache the message (i.e., the Bridge)
  | (10:19:16 AM) AndyTaylor: clebert: +1, i agree
  | (10:19:17 AM) clebert: jmesnil: I' m not 100% sure
  | (10:19:25 AM) AndyTaylor: clebert: internal use only
  | (10:19:26 AM) jmesnil: clebert: ok, it's more an "internal" feature
  | (10:19:54 AM) clebert: jmesnil: allthough I would need to set the attribute for the Bridge
  | (10:19:59 AM) clebert: on the CF used by the Bridge
  | (10:20:10 AM) clebert: maybe I would only set it on the JMSBridge
  | (10:20:38 AM) jmesnil: clebert: on the core bridge too?
  | (10:21:05 AM) clebert: jmesnil: no... the core bridge deals with ServerMessage which has the File on it already
  | (10:21:17 AM) jmesnil: clebert: ah, ok
  | (10:21:26 AM) clebert: jmesnil: I will double check it though
  | 

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