111 lines
2.8 KiB
JavaScript
111 lines
2.8 KiB
JavaScript
var Entry = (function () {
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function Entry(val) {
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this.value = val;
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}
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return Entry;
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}());
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export { Entry };
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var LinkedList = (function () {
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function LinkedList() {
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this._len = 0;
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}
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LinkedList.prototype.insert = function (val) {
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var entry = new Entry(val);
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this.insertEntry(entry);
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return entry;
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};
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LinkedList.prototype.insertEntry = function (entry) {
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if (!this.head) {
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this.head = this.tail = entry;
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}
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else {
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this.tail.next = entry;
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entry.prev = this.tail;
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entry.next = null;
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this.tail = entry;
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}
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this._len++;
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};
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LinkedList.prototype.remove = function (entry) {
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var prev = entry.prev;
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var next = entry.next;
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if (prev) {
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prev.next = next;
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}
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else {
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this.head = next;
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}
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if (next) {
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next.prev = prev;
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}
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else {
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this.tail = prev;
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}
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entry.next = entry.prev = null;
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this._len--;
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};
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LinkedList.prototype.len = function () {
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return this._len;
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};
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LinkedList.prototype.clear = function () {
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this.head = this.tail = null;
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this._len = 0;
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};
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return LinkedList;
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}());
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export { LinkedList };
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var LRU = (function () {
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function LRU(maxSize) {
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this._list = new LinkedList();
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this._maxSize = 10;
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this._map = {};
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this._maxSize = maxSize;
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}
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LRU.prototype.put = function (key, value) {
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var list = this._list;
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var map = this._map;
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var removed = null;
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if (map[key] == null) {
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var len = list.len();
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var entry = this._lastRemovedEntry;
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if (len >= this._maxSize && len > 0) {
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var leastUsedEntry = list.head;
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list.remove(leastUsedEntry);
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delete map[leastUsedEntry.key];
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removed = leastUsedEntry.value;
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this._lastRemovedEntry = leastUsedEntry;
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}
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if (entry) {
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entry.value = value;
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}
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else {
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entry = new Entry(value);
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}
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entry.key = key;
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list.insertEntry(entry);
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map[key] = entry;
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}
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return removed;
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};
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LRU.prototype.get = function (key) {
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var entry = this._map[key];
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var list = this._list;
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if (entry != null) {
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if (entry !== list.tail) {
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list.remove(entry);
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list.insertEntry(entry);
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}
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return entry.value;
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}
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};
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LRU.prototype.clear = function () {
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this._list.clear();
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this._map = {};
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};
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LRU.prototype.len = function () {
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return this._list.len();
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};
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return LRU;
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}());
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export default LRU;
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