prosody-modules
ed2bb50d4f91
mod_presence_cache/README.markdown

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mod_presence_cache/README.markdown @ 2147:ed2bb50d4f91

mod_presence_cache: Switch to using util.cache for limiting size of cache
author Kim Alvefur <zash@zash.se>
date Fri, 01 Apr 2016 15:18:56 +0200
parent 2146:39d958f4a0c3
comparison
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2146:39d958f4a0c3 2147:ed2bb50d4f91
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2 summary: Cache presence incoming presence 2 summary: Cache presence from remote users
3 ... 3 ...
4 4
5 Introduction 5 Introduction
6 ============ 6 ============
7 7
8 This module stores presence from users contact even when they are 8 This module stores a timestamp of the latest presence received from
9 offline, so that the client can see who is online faster when they sign 9 users contacts so that the client can see who is online faster when they
10 in, and won't have to wait for remote servers to reply. 10 sign 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 11
16 Configuration 12 Configuration
17 ============= 13 =============
18 14
19 Just enable the module. 15 Just enable the module.
24 } 20 }
25 21
26 Advanced configuration 22 Advanced configuration
27 ====================== 23 ======================
28 24
25 The size of the cache is tuneable:
29 26
27 presence_cache_size = 99
30 28
29 Compatibility
30 =============
31 31
32 TODO 32 Requires 0.10 or later
33 ====
34
35 - Deduplication, i.e don's send stanzas that are identical to the last
36 seen.
37 - Cache invalidation or expiry, eg if a remote server goes down or is
38 gone a long time.
39 - Sending probes at some interval to keep the cache reasonably fresh.
40
41