@lodestar/beacon-node
Version:
A Typescript implementation of the beacon chain
42 lines • 1.37 kB
JavaScript
export class MapTracker extends Map {
/** Tracks the number of reads each entry in the cache gets for metrics */
readCount = new Map();
/** Tracks the last time a state was read from the cache */
lastRead = new Map();
constructor(metrics) {
super();
if (metrics) {
metrics.reads.addGetValuesFn(() => Array.from(this.readCount.values()));
metrics.secondsSinceLastRead.addGetValuesFn(() => {
const now = Date.now();
const secondsSinceLastRead = [];
for (const lastRead of this.lastRead.values()) {
secondsSinceLastRead.push((now - lastRead) / 1000);
}
return secondsSinceLastRead;
});
}
}
get(key) {
const value = super.get(key);
if (value !== undefined) {
this.readCount.set(key, 1 + (this.readCount.get(key) ?? 0));
this.lastRead.set(key, Date.now());
}
return value;
}
delete(key) {
const deleted = super.delete(key);
if (deleted) {
this.readCount.delete(key);
this.lastRead.delete(key);
}
return deleted;
}
clear() {
super.clear();
this.readCount.clear();
this.lastRead.clear();
}
}
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