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add ArraysByKeyCache.ts (#366)

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* 'add ArraysByKeyCache'
* "minor change"
This commit is contained in:
Chris-MS-896
2021-01-08 22:51:50 -06:00
committed by GitHub
parent 6627172a52
commit 2d98c5d269
2 changed files with 19 additions and 14 deletions
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12
src/Explorer/Graph/GraphExplorerComponent/ArraysByKeyCache.ts
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@@ -11,7 +11,9 @@ export class ArraysByKeyCache<T> {
public constructor(maxNbElements: number) {
this.maxNbElements = maxNbElements;
this.clear();
this.keyQueue = [];
this.cache = {};
this.totalElements = 0;
}
public clear(): void {
@@ -58,7 +60,7 @@ export class ArraysByKeyCache<T> {
* @param startIndex
* @param pageSize
*/
public retrieve(key: string, startIndex: number, pageSize: number): T[] {
public retrieve(key: string, startIndex: number, pageSize: number): T[] | null {
if (!this.cache.hasOwnProperty(key)) {
return null;
}
@@ -77,8 +79,10 @@ export class ArraysByKeyCache<T> {
private reduceCacheSize(): void {
// remove an key and its array
const oldKey = this.keyQueue.shift();
this.totalElements -= this.cache[oldKey].length;
delete this.cache[oldKey];
if (oldKey) {
this.totalElements -= this.cache[oldKey].length;
delete this.cache[oldKey];
}
}
/**