prosody
0f7e7311eebf
util/smqueue.lua

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util/smqueue.lua @ 13525:0f7e7311eebf

util.xtemplate: Use same argument order in filters even without 'args' This removes the different argument order used between '{x|foo}' and '{x|foo(y)}' because the differing order was awkward and confusing. This util does not seem to be widely used so should not be problematic to change this part. The only known use is in mod_pubsub, which does not use the filter function feature.
author Kim Alvefur <zash@zash.se>
date Wed, 16 Oct 2024 16:15:05 +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