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barbershop2.html
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barbershop2.html
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<title>The barbershop problem</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<script>
var CUSTOMER_PATIENCE_LEVEL = 30;
var TICK_DURATION_MS = 1;
var WORKING_DURATION = 480;
var MIN_SERVICE_TIME = 20;
var MAX_SERVICE_TIME = 30;
var DAY_START = 9;
var ticksToTime = function (tickCount) {
var hours = DAY_START + Math.floor(tickCount / 60);
var minutes = tickCount % 60;
return hours + ":" + minutes;
};
var print = function (message) {
console.log("[ " + ticksToTime(Timeline.currentTick) + " ] " + message);
};
var generateRandomInt = function (min, max) {
min = Math.ceil(min)
max = Math.floor(max)
return Math.floor(Math.random() * (max - min)) + min;
};
var Customer = function (index, activateTick) {
this.name = "Customer-" + index;
this.waiting = false;
this.startedWaitAt = 0;
this.activateTick = activateTick;
this.lookingForHaircut = function () {
return Timeline.currentTick === this.activateTick;
};
this.visitBarbershop = function () {
print(this.name + " entered.");
if (Barbershop.isTakingCustomers()) {
if (Barbershop.hasRoom()) {
Barbershop.addToWaitingRoom(this);
this.waiting = true;
this.startedWaitAt = Timeline.currentTick;
} else {
print(this.name + " left impatiently.");
}
} else {
print(this.name + " left cursing himself.");
}
};
this.isTiredOfWaiting = function () {
return (
this.waiting &&
Timeline.currentTick === (this.startedWaitAt + CUSTOMER_PATIENCE_LEVEL)
);
};
this.tick = function () {
if (this.lookingForHaircut()) {
this.visitBarbershop();
}
if (this.isTiredOfWaiting()) {
this.waiting = false;
Barbershop.removeFromWaitingRoom(this);
print(this.name + " left unfulfilled.");
}
};
};
var Barber = function (name, shiftStart, shiftEnd) {
this.name = name;
this.atWork = false;
this.isWorking = false;
this.shiftStart = shiftStart;
this.shiftEnd = shiftEnd;
this.workingOn = null;
this.finishedWithCustomerAt = 0;
this.isTimeToStartShift = function () {
return Timeline.currentTick === this.shiftStart;
};
this.isTimeToEndShift = function () {
return Timeline.currentTick >= this.shiftEnd;
}
this.startWork = function () {
this.atWork = true;
};
this.stopWork = function () {
this.atWork = false;
};
this.estimateEffort = function (tickCount) {
var timeToComplete = generateRandomInt(MIN_SERVICE_TIME, MAX_SERVICE_TIME);
this.finishedWithCustomerAt = tickCount + timeToComplete;
};
this.workOn = function (customer, tickCount) {
this.estimateEffort(tickCount);
this.workingOn = customer;
this.isWorking = true;
customer.waiting = false;
print(this.name + " started cutting " + customer.name + "'s hair.");
};
this.isDoneWithCurrentCustomer = function (tickCount) {
return this.finishedWithCustomerAt === tickCount;
};
this.completeWork = function (tickCount) {
print(this.name + " ended cutting " + this.workingOn.name + "'s hair.")
print(this.workingOn.name + " left satisfied.");
Barbershop.removeFromWaitingRoom(this.workingOn);
this.isWorking = false;
this.workingOn = null;
};
this.tick = function () {
var tickCount = Timeline.currentTick;
if (this.isTimeToStartShift()) {
this.startWork();
print(this.name + " started shift.");
}
if (this.isDoneWithCurrentCustomer(tickCount)) {
this.completeWork(tickCount);
}
if (this.isTimeToEndShift() &&
!this.isWorking && this.atWork) {
this.stopWork();
print(this.name + " ended shift.");
}
};
};
var Barbershop = {
totalTicks: 0,
openForBusiness: false,
customerQueue: [],
maxCapacity: 15,
init: function (totalTicks) {
this.totalTicks = totalTicks;
},
isTakingCustomers: function () {
return Timeline.currentTick <= WORKING_DURATION;
},
open: function () {
this.openForBusiness = true;
print("Barber shop opened");
},
close: function () {
this.openForBusiness = false;
this.kickWaitingCustomers();
print("Barber shop closed");
},
getUnAttendedCustomers: function () {
return this.customerQueue.filter(function (customer) {
return Barbers.barbers.map(function (barber) {
return (!barber.workingOn ||
(barber.workingOn.name !== customer.name));
}).reduce(function (accumulator, currentValue) {
return accumulator && currentValue;
});
});
},
kickWaitingCustomers: function () {
var that = this;
var customersToKick = this.getUnAttendedCustomers();
customersToKick.forEach(function (customer) {
that.removeFromWaitingRoom(customer);
print(customer.name + " left furiously.");
});
},
hasRoom: function () {
return this.customerQueue.length < this.maxCapacity;
},
addToWaitingRoom: function (customer) {
this.customerQueue.push(customer);
},
removeFromWaitingRoom: function (customer) {
this.customerQueue = this.customerQueue.filter(function (customerInTest) {
return customerInTest.name !== customer.name;
});
},
tick: function () {
var tickCount = Timeline.currentTick;
if (tickCount === 1) { this.open(tickCount); }
if (tickCount === this.totalTicks) { this.close(tickCount); }
if (this.openForBusiness) {
Barbers.takeOnCustomers(tickCount, this.getUnAttendedCustomers());
}
}
};
var Barbers = {
barbers: [],
addBarber: function (barber) {
this.barbers.push(barber);
},
init: function () {
this.addBarber(new Barber("Alto", 1, 240));
this.addBarber(new Barber("Basil", 1, 240));
this.addBarber(new Barber("Camphor", 1, 240));
this.addBarber(new Barber("Diogenes", 1, 240));
this.addBarber(new Barber("Eros", 241, 480));
this.addBarber(new Barber("Fatoush", 241, 480));
this.addBarber(new Barber("Glorio", 241, 480));
this.addBarber(new Barber("Heber", 241, 480));
},
takeOnCustomers: function (tickCount, unattendedCustomers) {
this.barbers.forEach(function (barber){
if (barber.atWork && !barber.isWorking) {
var customer = unattendedCustomers.pop();
if (customer) {
barber.workOn(customer, tickCount);
}
}
});
},
tick: function () {
this.barbers.forEach(function (barber) {
barber.tick(Timeline.currentTick);
});
}
};
var Customers = {
customers: [],
totalTicks: 0,
averageCheckInInterval: 10,
generateCustomerBase: function () {
var customerCount = this.totalTicks / this.averageCheckInInterval;
for (var i = 0; i < customerCount; i++) {
var intraIntervalOffset = generateRandomInt(0, this.averageCheckInInterval);
var activateTick = (i * 10) + intraIntervalOffset;
this.addCustomer(i + 1, activateTick)
}
},
addCustomer: function (index, activateTick) {
this.customers.push(new Customer(index, activateTick));
},
init: function (totalTicks) {
this.totalTicks = totalTicks;
this.generateCustomerBase()
},
tick: function () {
this.customers.forEach(function (customer) {
customer.tick();
});
}
};
var Timeline = {
totalTicks: WORKING_DURATION + MAX_SERVICE_TIME,
currentTick: 0,
tickIntervalPtr: null,
init: function () {
Barbershop.init(this.totalTicks);
Barbers.init(this.totalTicks);
Customers.init(this.totalTicks);
},
tickIntervalHandler: function () {
Barbers.tick();
Customers.tick();
Barbershop.tick();
},
run: function () {
var that = this;
var intervalFn = function () {
that.currentTick++;
that.tickIntervalHandler();
if (that.currentTick === that.totalTicks) {
clearInterval(that.tickIntervalPtr);
}
};
this.tickIntervalPtr = setInterval(intervalFn, TICK_DURATION_MS)
}
};
Timeline.init();
Timeline.run();
</script>
</body>
</html>