January 2002
Beginner
480 pages
13h 15m
English
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jabber:x:expire
The jabber:x:expire is a simple namespace to
add a “use by” or “read by” stamp to a message. If you wish to send a
message and impose a finite lifetime upon it, attach an expiry extension thus:
SEND: <message to='piers@pipetree.com' id='M24'>
<subject>Twinkies!</subject>
<body>
I've got some fresh Twinkies here, stop
by for one before they all disappear!
</body>
<x xmlns='jabber:x:expire' seconds='1800'/>
</message>
If Piers was not connected when the message was sent, the
mod_offline module would hold the message ready
for when he reconnects. But before storing it, an extra attribute (stored) is added with the current
time.
Example 6-7 shows what the relevant section of Piers’ spool file would look like.
Example 6-7. Storage of an offline message with the jabber:x:expire extension
<foo xmlns='jabber:x:offline' xdbns='jabber:x:offline'>
<message to='piers@pipetree.com' id='M24' from='dj@pipetree.com/kitchen'>
<subject>Twinkies!</subject>
<body>
I've got some fresh Twinkies here, stop
by for one before they all disappear!
</body>
<x xmlns='jabber:x:expire' seconds='600' stored='993038415'/>
<x xmlns='jabber:x:delay' from='dj@pipetree.com' stamp='20010620T12:00:15'>
Offline Storage
</x>
</message>
</foo>
When Piers reconnects, mod_offline retrieves the message
and compares the current time with the value in the
stored attribute. If the difference exceeds the
desired lifetime of the message, as specified in the
seconds attribute, the message is discarded. Otherwise, ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.