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annotate mod_presence_cache/README.markdown @ 2146:39d958f4a0c3

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mod_presence_cache: Remove caching of full presence
author Kim Alvefur <zash@zash.se>
date Fri, 01 Apr 2016 15:15:56 +0200
parents 65beed3ac500
children ed2bb50d4f91
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9d0c33ebbcc5 mod_presence_cache: Cache incoming presence broadcasts in order to get clients up to speed with who is online faster
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1 ---
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2 summary: Cache presence incoming presence
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3 ...
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4
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5 Introduction
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6 ============
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7
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8 This module stores presence from users contact even when they are
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9 offline, so that the client can see who is online faster when they sign
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10 in, and won't have to wait for remote servers to reply.
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11
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12 Note that in its current form, the number of presence stanzas sent to a
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13 client is doubled, as the client would get both the cached stanzas and
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14 replies to presence probes. Also see [mod\_throttle\_presence].
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15
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16 Configuration
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17 =============
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18
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19 Just enable the module.
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20
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21 modules_enabled = {
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22 -- more modules
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23 "presence_cache";
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24 }
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25
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26 Advanced configuration
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27 ======================
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28
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65beed3ac500 mod_presence_cache/README: Try to discourage full stanza caching since it is experimental
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1952
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32 TODO
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33 ====
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34
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35 - Deduplication, i.e don's send stanzas that are identical to the last
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36 seen.
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37 - Cache invalidation or expiry, eg if a remote server goes down or is
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38 gone a long time.
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39 - Sending probes at some interval to keep the cache reasonably fresh.
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