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98 lines
2.5 KiB
Lua
98 lines
2.5 KiB
Lua
-- Copyright (c) 2011 by Robert G. Jakabosky <bobby@sharedrealm.com>
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--
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-- Permission is hereby granted, free of charge, to any person obtaining a copy
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-- of this software and associated documentation files (the "Software"), to deal
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-- in the Software without restriction, including without limitation the rights
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-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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-- copies of the Software, and to permit persons to whom the Software is
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-- furnished to do so, subject to the following conditions:
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--
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-- The above copyright notice and this permission notice shall be included in
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-- all copies or substantial portions of the Software.
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--
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-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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-- THE SOFTWARE.
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--
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-- zmq.poller wraps the low-level zmq.ZMQ_Poller object.
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--
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-- This wrapper simplifies the event polling loop.
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--
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local zmq = require"zmq"
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local setmetatable = setmetatable
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local tonumber = tonumber
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local assert = assert
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local poller_mt = {}
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poller_mt.__index = poller_mt
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function poller_mt:add(sock, events, cb)
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self.poller:add(sock, events)
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self.callbacks[sock] = cb
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end
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function poller_mt:modify(sock, events, cb)
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if events ~= 0 and cb then
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self.callbacks[sock] = cb
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self.poller:modify(sock, events)
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else
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self:remove(sock)
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end
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end
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function poller_mt:remove(sock)
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self.poller:remove(sock)
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self.callbacks[sock] = nil
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end
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function poller_mt:poll(timeout)
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local poller = self.poller
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local status, err = poller:poll(-1)
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if not status then
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return false, err
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end
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local callbacks = self.callbacks
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while true do
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local sock, revents = poller:next_revents()
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if not sock then
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break
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end
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local cb = callbacks[sock]
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if not cb then
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error("Missing callback for sock:" .. tostring(sock))
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end
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cb(sock, revents)
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end
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return true
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end
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function poller_mt:start()
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self.is_running = true
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while self.is_running do
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self:poll(-1)
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end
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end
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function poller_mt:stop()
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self.is_running = false
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end
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module(...)
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function new(pre_alloc)
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return setmetatable({
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poller = zmq.ZMQ_Poller(pre_alloc),
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callbacks = setmetatable({}, {__mode="k"}),
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}, poller_mt)
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end
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setmetatable(_M, {__call = function(tab, ...) return new(...) end})
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