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local gettime = require "socket".gettime;
local setmetatable = setmetatable;
module "throttle"
local throttle = {};
local throttle_mt = { __index = throttle };
function throttle:update()
local newt = gettime();
local elapsed = newt - self.t;
self.t = newt;
local balance = self.rate * elapsed + self.balance;
if balance > self.max then
self.balance = self.max;
else
self.balance = balance;
end
return self.balance;
end
function throttle:peek(cost)
cost = cost or 1;
return self.balance >= cost or self:update() >= cost;
end
function throttle:poll(cost, split)
if self:peek(cost) then
self.balance = self.balance - cost;
return true;
else
local balance = self.balance;
if split then
self.balance = 0;
end
return false, balance, (cost-balance);
end
end
function create(max, period)
return setmetatable({ rate = max / period, max = max, t = 0, balance = max }, throttle_mt);
end
return _M;
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