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spec/scansion/issue1224.scs @ 13186:affaf6d08d26
util.datamanager: Pad list writes to avoid crossing block boundaries
By padding items so that they do not cross block boundaries, it becomes
eaiser to delete whole blocks with fallocate() without cutting items
in half, improving efficiency of such operations.
Since list stores are used for message archives, where the most common
deletion operation would be of the oldest entires, at the top of the
file. With this, all blocks that contain items to be removed could be
deleted without needing to read, delete and write out the whole file.
author | Kim Alvefur <zash@zash.se> |
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date | Wed, 07 Jun 2023 00:39:30 +0200 |
parent | 9605:07e3b8e60a6c |
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# MUC: Handle affiliation changes from buggy clients [Client] Romeo jid: user@localhost password: password [Client] Juliet jid: user2@localhost password: password ----- Romeo connects Romeo sends: <presence to="room@conference.localhost/Romeo"> <x xmlns="http://jabber.org/protocol/muc"/> </presence> Romeo receives: <presence from='room@conference.localhost/Romeo'> <x xmlns='http://jabber.org/protocol/muc#user'> <status code='201'/> <item jid="${Romeo's full JID}" affiliation='owner' role='moderator'/> <status code='110'/> </x> </presence> Romeo receives: <message type='groupchat' from='room@conference.localhost'><subject/></message> # Submit config form Romeo sends: <iq id='config1' to='room@conference.localhost' type='set'> <query xmlns='http://jabber.org/protocol/muc#owner'> <x xmlns='jabber:x:data' type='submit'> <field var='FORM_TYPE'> <value>http://jabber.org/protocol/muc#roomconfig</value> </field> </x> </query> </iq> Romeo receives: <iq id="config1" from="room@conference.localhost" type="result"> </iq> Romeo sends: <iq id='member1' to='room@conference.localhost' type='set'> <query xmlns='http://jabber.org/protocol/muc#admin'> <item affiliation='member' jid="${Juliet's JID}" /> </query> </iq> Romeo receives: <message from='room@conference.localhost'> <x xmlns='http://jabber.org/protocol/muc#user'> <item jid="${Juliet's JID}" affiliation='member' xmlns='http://jabber.org/protocol/muc#user'/> </x> </message> Romeo receives: <iq from='room@conference.localhost' id='member1' type='result'/> # Juliet connects, and joins the room Juliet connects Juliet sends: <presence to="room@conference.localhost/Juliet"> <x xmlns="http://jabber.org/protocol/muc"/> </presence> Juliet receives: <presence from="room@conference.localhost/Romeo" /> Juliet receives: <presence from="room@conference.localhost/Juliet" /> Juliet receives: <message type='groupchat' from='room@conference.localhost'><subject/></message> Romeo receives: <presence from="room@conference.localhost/Juliet" /> # Romeo makes Juliet a member of the room, however his client is buggy and only # specifies her nickname Romeo sends: <iq id='member1' to='room@conference.localhost' type='set'> <query xmlns='http://jabber.org/protocol/muc#admin'> <item affiliation='member' nick='Juliet' /> </query> </iq> Romeo receives: <presence from='room@conference.localhost/Juliet'> <x xmlns='http://jabber.org/protocol/muc#user'> <item affiliation='member' role='participant' jid="${Juliet's full JID}"> <actor jid="${Romeo's full JID}" nick='Romeo'/> </item> </x> </presence> Romeo receives: <iq type='result' id='member1' from='room@conference.localhost' /> Juliet receives: <presence from='room@conference.localhost/Juliet'> <x xmlns='http://jabber.org/protocol/muc#user'> <item affiliation='member' role='participant' jid="${Juliet's full JID}"> <actor nick='Romeo' /> </item> <status xmlns='http://jabber.org/protocol/muc#user' code='110'/> </x> </presence>