prosody
176fd3ea505c
util/smqueue.lua

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util/smqueue.lua @ 12817:176fd3ea505c

util.openmetrics: Update tools.ietf.org URL to datatracker See bd9e006a7a74 for more context
author Kim Alvefur <zash@zash.se>
date Mon, 19 Dec 2022 23:11:42 +0100
parent 12058:4860da718e87
child 12975:d10957394a3c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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daced16154fa util.smqueue: Abstract queue with acknowledgements and overflow
Kim Alvefur <zash@zash.se>
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1 local queue = require("util.queue");
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2
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3 local lib = { smqueue = {} }
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4
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5 local smqueue = lib.smqueue;
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6
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7 function smqueue:push(v)
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8 self._head = self._head + 1;
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9
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10 assert(self._queue:push(v));
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11 end
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13 function smqueue:ack(h)
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14 if h < self._tail then
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15 return nil, "tail"
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16 elseif h > self._head then
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17 return nil, "head"
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18 end
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19
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20 local acked = {};
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21 self._tail = h;
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22 local expect = self._head - self._tail;
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23 while expect < self._queue:count() do
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24 local v = self._queue:pop();
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25 if not v then return nil, "pop" end
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26 table.insert(acked, v);
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27 end
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28 return acked
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29 end
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30
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31 function smqueue:count_unacked() return self._head - self._tail end
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32
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33 function smqueue:count_acked() return self._tail end
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34
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35 function smqueue:resumable() return self._queue:count() >= (self._head - self._tail) end
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36
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37 function smqueue:resume() return self._queue:items() end
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38
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39 function smqueue:consume() return self._queue:consume() end
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40
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41 function smqueue:table()
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42 local t = {};
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43 for i, v in self:resume() do t[i] = v; end
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44 return t
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45 end
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46
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47 local function freeze(q) return { head = q._head; tail = q._tail } end
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48
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49 local queue_mt = { __name = "smqueue"; __index = smqueue; __len = smqueue.count_unacked; __freeze = freeze }
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50
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51 function lib.new(size)
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52 assert(size > 0);
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53 return setmetatable({ _head = 0; _tail = 0; _queue = queue.new(size, true) }, queue_mt)
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54 end
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55
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56 return lib