Created
August 8, 2016 20:47
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Sample coding example
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| function assert(one, two) { | |
| if (one !== two) { | |
| throw new Error(`${one} not equal to ${two}!!`); | |
| } else { | |
| console.info(`Success! ${one} is equal to ${two}!`); | |
| } | |
| } | |
| function nextServerNumber(arrayOfInts) { | |
| let lowestServerNumber = 1; | |
| let found = false; | |
| while (!found) { | |
| if (arrayOfInts.indexOf(lowestServerNumber) >= 0) { | |
| lowestServerNumber += 1; | |
| } else { | |
| found = true; | |
| } | |
| } | |
| return lowestServerNumber; | |
| } | |
| assert(nextServerNumber([5, 3, 1]), 2); | |
| assert(nextServerNumber([5, 4, 1, 2]), 3); | |
| assert(nextServerNumber([3, 2, 1]), 4); | |
| assert(nextServerNumber([2, 3]), 1); | |
| assert(nextServerNumber([]), 1); | |
| /**************************/ | |
| let Tracker = function () { | |
| this.hostnames = {}; | |
| }; | |
| Tracker.prototype.allocate = function (hostType) { | |
| if (!this.hostnames[hostType]) { | |
| this.hostnames[hostType] = []; | |
| } | |
| let nextNumber = nextServerNumber(this.hostnames[hostType]); | |
| this.hostnames[hostType].push(nextNumber); | |
| return `${hostType}${nextNumber}`; | |
| }; | |
| Tracker.prototype.deallocate = function (hostname) { | |
| let matches = hostname.match(/([a-z]+)(\d+)/); | |
| if (!Array.isArray(matches)) { | |
| throw new Error('some funky input!'); | |
| } | |
| let hostType = matches[1]; | |
| let serverNumber = parseInt(matches[2], 10); | |
| if (this.hostnames[hostType] && this.hostnames[hostType].indexOf(serverNumber) !== -1) { | |
| let index = this.hostnames[hostType].indexOf(serverNumber); | |
| this.hostnames[hostType].splice(index, 1); | |
| } | |
| }; | |
| let tracker = new Tracker(); | |
| assert(tracker.allocate('apibox'), 'apibox1'); | |
| assert(tracker.allocate('apibox'), 'apibox2'); | |
| assert(tracker.deallocate('apibox1'), undefined); | |
| assert(tracker.allocate('apibox'), 'apibox1'); | |
| assert(tracker.allocate('sitebox'), 'sitebox1') |
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