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spec/scansion/pubsub_advanced.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> |
---|---|
date | Wed, 07 Jun 2023 00:39:30 +0200 |
parent | 11714:d783716103c1 |
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# Pubsub: Node creation, publish, subscribe, affiliations and delete [Client] Balthasar jid: admin@localhost password: password [Client] Romeo jid: romeo@localhost password: password [Client] Juliet jid: juliet@localhost password: password --------- Romeo connects Romeo sends: <iq type="set" to="pubsub.localhost" id='create1'> <pubsub xmlns="http://jabber.org/protocol/pubsub"> <create node="princely_musings"/> </pubsub> </iq> Romeo receives: <iq type="error" id='create1'> <error type="auth"> <forbidden xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/> </error> </iq> Balthasar connects Balthasar sends: <iq type='set' to='pubsub.localhost' id='create2'> <pubsub xmlns='http://jabber.org/protocol/pubsub'> <create node='princely_musings'/> </pubsub> </iq> Balthasar receives: <iq type="result" id='create2'/> Balthasar sends: <iq type="set" to="pubsub.localhost" id='create3'> <pubsub xmlns="http://jabber.org/protocol/pubsub"> <create node="princely_musings"/> </pubsub> </iq> Balthasar receives: <iq type="error" id='create3'> <error type="cancel"> <conflict xmlns="urn:ietf:params:xml:ns:xmpp-stanzas"/> </error> </iq> Juliet connects Juliet sends: <iq type="set" to="pubsub.localhost" id='sub1'> <pubsub xmlns="http://jabber.org/protocol/pubsub"> <subscribe node="princely_musings" jid="${Romeo's full JID}"/> </pubsub> </iq> Juliet receives: <iq type="error" id='sub1'/> Juliet sends: <iq type="set" to="pubsub.localhost" id='sub2'> <pubsub xmlns="http://jabber.org/protocol/pubsub"> <subscribe node="princely_musings" jid="${Juliet's full JID}"/> </pubsub> </iq> Juliet receives: <iq type="result" id='sub2'> <pubsub xmlns='http://jabber.org/protocol/pubsub'> <subscription jid="${Juliet's full JID}" node='princely_musings' subscription='subscribed'/> </pubsub> </iq> Balthasar sends: <iq type="get" id='aff1' to='pubsub.localhost'> <pubsub xmlns="http://jabber.org/protocol/pubsub#owner"> <affiliations node="princely_musings"/> </pubsub> </iq> Balthasar receives: <iq type="result" id='aff1' from='pubsub.localhost'> <pubsub xmlns="http://jabber.org/protocol/pubsub#owner"> <affiliations node="princely_musings"> <affiliation affiliation='owner' jid='admin@localhost' xmlns='http://jabber.org/protocol/pubsub#owner'/> </affiliations> </pubsub> </iq> Balthasar sends: <iq type="set" id='aff2' to='pubsub.localhost'> <pubsub xmlns="http://jabber.org/protocol/pubsub#owner"> <affiliations node="princely_musings"> <affiliation affiliation='owner' jid='admin@localhost' xmlns='http://jabber.org/protocol/pubsub#owner'/> <affiliation jid="${Romeo's JID}" affiliation="publisher"/> </affiliations> </pubsub> </iq> Balthasar receives: <iq type="result" id='aff2' from='pubsub.localhost'/> Romeo sends: <iq type="set" to="pubsub.localhost" id='pub1'> <pubsub xmlns="http://jabber.org/protocol/pubsub"> <publish node="princely_musings"> <item id="current"> <entry xmlns="http://www.w3.org/2005/Atom"> <title>Soliloquy</title> <summary>Lorem ipsum dolor sit amet</summary> </entry> </item> </publish> </pubsub> </iq> Juliet receives: <message type="headline" from="pubsub.localhost"> <event xmlns="http://jabber.org/protocol/pubsub#event"> <items node="princely_musings"> <item id="current" publisher="${Romeo's JID}"> <entry xmlns="http://www.w3.org/2005/Atom"> <title>Soliloquy</title> <summary>Lorem ipsum dolor sit amet</summary> </entry> </item> </items> </event> </message> Romeo receives: <iq type="result" id='pub1'/> Juliet sends: <iq type="set" to="pubsub.localhost" id='unsub1'> <pubsub xmlns="http://jabber.org/protocol/pubsub"> <unsubscribe node="princely_musings" jid="${Juliet's full JID}"/> </pubsub> </iq> Juliet receives: <iq type="result" id='unsub1'> <pubsub xmlns='http://jabber.org/protocol/pubsub'> <subscription jid="${Juliet's full JID}" node='princely_musings' subscription='none'/> </pubsub> </iq> Balthasar sends: <iq type="set" to="pubsub.localhost" id='del1'> <pubsub xmlns="http://jabber.org/protocol/pubsub#owner"> <delete node="princely_musings"/> </pubsub> </iq> Balthasar receives: <iq type="result" from='pubsub.localhost' id='del1'/> Romeo disconnects // vim: syntax=xml: