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--></style></head><body lang=EN-US link=blue vlink="#954F72"><div class=WordSection1><div><div><p class=MsoNormal>Hi John</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’m answering about NFD 0.5.0.</p></div><div><ol start=1 type=1><li class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;mso-list:l0 level1 lfo1'>The NFD developer documentation makes mention of <b>admission policy</b> related to the content store. Is this the CachePolicy?</li></ol><p class=MsoNormal>No. CachePolicy belongs to NDNLPv2.</p><p class=MsoNormal>In ContentStore, there is only one policy: <span style='font-family:"Courier New"'>nfd::cs::Policy</span>. This type serves as both admission policy and eviction policy.</p><p class=MsoNormal>To implement an admission policy, override <span style='font-family:"Courier New"'>doAfterInsert</span> method, check the newly inserted data, and evict it right away if the policy decides not the admit the data. Although the data is already inserted to the lookup index when <span style='font-family:"Courier New"'>doAfterInsert</span> is invoked, evicting it immediately is equivalent to not admitting it.</p><p class=MsoNormal>The rationale of not having a “before insert” API is to reduce the number of virtual functions a policy must override.</p><ol start=2 type=1><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1'>In order to customize how data (perhaps, rather what data) makes it in to the CS and what is removed when, do I subclass CachePolicy?</li></ol><p class=MsoNormal>No. You should subclass <span style='font-family:"Courier New"'>nfd::cs::Policy</span>.</p><ol start=2 type=1><ul type=circle><li class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;mso-list:l0 level2 lfo1'>Once you create such a subclass, where do you put it so "the system" will recognize it when you use a CS::setPolicy call?</li></ul></ol><p class=MsoNormal>For now, <span style='font-family:"Courier New"'><a href="https://github.com/named-data/NFD/blob/cbc8e947bf778b728446edc33edd0953df025f90/daemon/table/cs.cpp#L48-L52">nfd::cs::makeDefaultPolicy</a></span> function.</p><p class=MsoNormal>In #<a href="https://redmine.named-data.net/issues/3148">3148</a> we’ll allow configuration. Runtime changes of the policy will still be disallowed.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Yours, Junxiao</p></div></div></div></body></html>