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@maritaria
Created January 29, 2018 13:04
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local intercept = {}
function intercept.before(func, callback)
return function(...)
callback(...)
return func(...)
end
end
function intercept.after(func, callback)
return function(...)
local result = func(...)
callback(..., result)
return result
end
end
function intercept.around(func, callback)
return function(...) return callback(func, ...) end
end
return intercept
local userClass = require("userclass")
require("usercoordination") --installs the coordination aspect
local user1 = userClass.create()
local user2 = userClass.create()
local user3 = userClass.create()
local user4 = userClass.create()
local user5 = userClass.create()
local user6 = userClass.create()
local user7 = userClass.create()
local user8 = userClass.create()
local user9 = userClass.create()
print("user1", user1:findSlot())
print("user2", user2:findSlot())
print("user3", user3:findSlot())
print("user4", user4:findSlot())
print("user5", user5:findSlot())
print("user6", user6:findSlot())
print("user7", user7:findSlot())
print("user8", user8:findSlot())
print("user9", user9:findSlot())
local userClass = {}
function userClass:findSlot()
while true do
local slot = math.random(0, 10)
if self:canUseSlot(slot) then
self:reserveSlot(slot)
return slot
end
end
end
function userClass:canUseSlot(slot)
return not self.slots[slot]
end
function userClass:reserveSlot(slot)
self.slots[slot] = true
end
function userClass.create()
local instance = { slots = {} }
setmetatable(instance, { __index = userClass })
return instance
end
return userClass
local userClass = require("userclass")
local intercept = require("intercept")
--Create a weak table that allows the users to be garbage collected
local users = setmetatable({}, { __mode = "kv" })
local counter = 0
userClass.create = intercept.after(userClass.create, function(_, inst)
--Save the users in the table
counter = counter + 1
users[inst] = counter
print("registered user #" .. counter)
end)
userClass.canUseSlot = intercept.around(userClass.canUseSlot, function(func, user, slot)
--Check with all existing users
local result = true
print("Organized reservation for slot #" .. slot)
for existingUser, index in pairs(users) do
print("checking with user #" .. index)
if not func(existingUser, slot) then
print("Collision with user schedule, returning false")
return false
end
end
return true
end)
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