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https://issues.apache.org/jira/browse/VYSPER-292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13084992#comment-13084992
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Bernd Fondermann commented on VYSPER-292:
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As I said in my comment VYSPER-286#29/Jun/11 07:33, TCP/IP is unable to detect
this kind of disconnect _as_long_as_ there is no data sent over the wire -
neither side of the connection will detect it.
On the other hand, in the basic XMPP protocol, the server doesn't ping its
clients, for good reasons.
Still, a solution would be to implement a server-to-client ping, but be aware
of the fact that clients not under your control might not support it, it
generates a lot more traffic and for flakey network connections this might
cause unceccessary reconnects. Ping support is already present in the Vysper
codebase, but servers do not ping clients regularily (and I certainly don't
want to support it by default). See also
http://xmpp.org/extensions/xep-0199.html
As a side note, please let us discuss these kind of topics on the dev list
first and create new JIRA issues second. Thank you.
> Detecting unexpected network disconnects
> ----------------------------------------
>
> Key: VYSPER-292
> URL: https://issues.apache.org/jira/browse/VYSPER-292
> Project: VYSPER
> Issue Type: Bug
> Components: connection handshake
> Reporter: Arun Prem
>
> This is similar to the one mentioned in the issue 286. Since there are no
> ways found to reopen the issue (which was already marked as 'Resolved'), I'm
> creating a new issue.
> As a solution for the issue reported in 286, it is suggested to add a
> shutdown hook. But it seems it won't address the cases of unexpected network
> disconnects as given in the following scenario.
> 1. User1 logs in. The status is set as 'Available' by default.
> ==> User1's status is reflected in the messenger window of other logged in
> users.
> 2. Disconnect User1's workstation from the network.
> ==> Other user's list disappears from User1 messenger window.
> 3. Check the status of User1 from the messenger window of other logged in
> users.
> ==> User1's status still remains in the same for all other users.
> Expected: User1's status should be made offline to other users as soon as the
> network disconnects.
> The questions is how to detect the unexpected network disconnects for User1
> and broadcast the status (as offline) to other logged-in users.
> Thanks...
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