It is currently unclear which activities will be received, send or executed
when a user leaves the session. This should be handled more gracefully (e.g
disable receiving and execution of activities before sending the leave
message). Furthermore the host has to handle the leave signal different when
sending it to the other session users to ensure that all activities that were
received from that user are executed on the remote side of the other users
before they are notified that the user left the session.
---
** [bugs:#201] Shutdown of communication is too lazy**
**Status:** open
**Labels:** Main
**Created:** Thu Apr 23, 2009 01:37 PM UTC by Lisa Dohrmann
**Last Updated:** Mon Apr 04, 2011 08:23 AM UTC
**Owner:** nobody
<s>If the host of a session leaves and thus throws all participants out, the
following exception might occur if AbstractSessionListener.sessionEnded\(\) is
executed before AbstractSharedProjectListener.userLeft\(\) in the EditorManager
\(race condition\). In this case the SharedProject is already null when it is
used in userLeft\(\).
java.lang.NullPointerException
at
de.fu\_berlin.inf.dpp.editor.EditorManager$2.userLeft\(EditorManager.java:436\)
at
de.fu\_berlin.inf.dpp.project.internal.SharedProject.removeUser\(SharedProject.java:244\)
at
de.fu\_berlin.inf.dpp.net.business.LeaveHandler.leaveReceived\(LeaveHandler.java:49\)
at
de.fu\_berlin.inf.dpp.net.internal.extensions.LeaveExtension.processMessage\(LeaveExtension.java:33\)
at
de.fu\_berlin.inf.dpp.net.internal.extensions.SarosDefaultPacketExtension.processPacket\(SarosDefaultPacketExtension.java:32\)
at
de.fu\_berlin.inf.dpp.net.internal.XMPPChatReceiver.processPacket\(XMPPChatReceiver.java:68\)
at
de.fu\_berlin.inf.dpp.net.internal.XMPPChatTransmitter$XMPPChatTransmitterPacketListener$1.run\(XMPPChatTransmitter.java:151\)
at de.fu\_berlin.inf.dpp.util.Util$6.run\(Util.java:357\)
at java.util.concurrent.Executors$RunnableAdapter.call\(Unknown Source\)
at java.util.concurrent.FutureTask$Sync.innerRun\(Unknown Source\)
at java.util.concurrent.FutureTask.run\(Unknown Source\)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask\(Unknown
Source\)
at java.util.concurrent.ThreadPoolExecutor$Worker.run\(Unknown Source\)
at java.lang.Thread.run\(Unknown Source\)</s>
---
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