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mod_presence_cache: Cache incoming presence broadcasts in order to get clients up to speed with who is online faster
author Kim Alvefur <zash@zash.se>
date Mon, 16 Nov 2015 18:19:25 +0100
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1 ---
2 summary: Cache presence incoming presence
3 ...
4
5 Introduction
6 ============
7
8 This module stores presence from users contact even when they are
9 offline, so that the client can see who is online faster when they sign
10 in, and won't have to wait for remote servers to reply.
11
12 Note that in its current form, the number of presence stanzas sent to a
13 client is doubled, as the client would get both the cached stanzas and
14 replies to presence probes. Also see [mod\_throttle\_presence].
15
16 By default, only binary (online or offline) state is stored. It can
17 optionally store the full presence but this requires much more memory.
18
19 Configuration
20 =============
21
22 Just enable the module.
23
24 modules_enabled = {
25 -- more modules
26 "presence_cache";
27 }
28
29 Advanced configuration
30 ======================
31
32 To enable full stanza caching:
33
34 presence_cache_full = false
35
36 TODO
37 ====
38
39 - Deduplication, i.e don's send stanzas that are identical to the last
40 seen.
41 - Cache invalidation or expiry, eg if a remote server goes down or is
42 gone a long time.
43 - Sending probes at some interval to keep the cache reasonably fresh.
44
45