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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Does this help -
</span><a href="http://steve.vinoski.net/blog/2011/03/23/dont-lose-your-ets-tables/">http://steve.vinoski.net/blog/2011/03/23/dont-lose-your-ets-tables/</a> and
<a href="http://steve.vinoski.net/blog/2013/05/08/implementation-of-dont-lose-your-ets-tables/">
http://steve.vinoski.net/blog/2013/05/08/implementation-of-dont-lose-your-ets-tables/</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Mark<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif""> erlang-questions-bounces@erlang.org [mailto:erlang-questions-bounces@erlang.org]
<b>On Behalf Of </b>Barco You<br>
<b>Sent:</b> 13 November 2013 05:20<br>
<b>To:</b> akonsu<br>
<b>Cc:</b> erlang-questions<br>
<b>Subject:</b> Re: [erlang-questions] ETS tables and pubsub<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Why don't you use gproc?<o:p></o:p></p>
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<p class="MsoNormal">On Wed, Nov 13, 2013 at 2:38 AM, akonsu <<a href="mailto:akonsu@gmail.com" target="_blank">akonsu@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">I have a pubsub system which has a single publisher process that maintains all its subscriber processes' Pid's in an ETS table.<o:p></o:p></p>
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<p class="MsoNormal">The publisher monitors its subscribers and when the publisher receives DOWN message, it removes the subscriber Pid from the table.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">The table entries are tuples of the form {MonitorRef, SubscriberPid}, and the MonitorRef is used as the key.<o:p></o:p></p>
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<p class="MsoNormal">Now I would like to make sure that if the publisher dies, and gets restarted by its supervisor, the subscriber table is preserved. So I created a process that creates the ETS table, sets the table's heir to self(), and then gives away the
table to the publisher.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">The problem is that I do not know how to handle transfer of the table from the heir to the publisher:<o:p></o:p></p>
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<p class="MsoNormal">when publisher receives the table, the table contains a list of tuples {MonitorRef, SubscriberPid}, but the MonitorRefs were created by the previous publisher instance, so when the new publisher receives ETS_TRANSFER it needs to monitor
all these SubscriberPids again.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">what is the best way to do it? Loop over all ETS entries, attach a monitor to each and reenter the new MonitorRefs into the table? This might be slow, no? Maybe my architecture can be improved? Any advice?<o:p></o:p></p>
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<p class="MsoNormal">thanks<o:p></o:p></p>
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<p class="MsoNormal">Konstantin<o:p></o:p></p>
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