prosody
c48ae06e24d6
util/smqueue.lua

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util/smqueue.lua @ 13182:c48ae06e24d6

util.datamanager: Fix indexing first item if not at the very start If the first item does not start at position 0 then the index function produces a phantom first entry covering position zero until where the real first item starts. When using the index, this would make it either appear as the first item was missing or cause an off-by-one issue with remaining items.
author Kim Alvefur <zash@zash.se>
date Mon, 10 Jul 2023 17:19:05 +0200
parent 12975:d10957394a3c
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d10957394a3c util: Prefix module imports with prosody namespace
Kim Alvefur <zash@zash.se>
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1 local queue = require("prosody.util.queue");
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daced16154fa util.smqueue: Abstract queue with acknowledgements and overflow
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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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12
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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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4860da718e87 util.smqueue: Simplify compat table, fix dependent modules (thanks Martin)
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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