pandora-metrics/dist/client/CachedMetricSet.js

## Overview

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const MetricSet_1 = require("../common/MetricSet");
class CachedMetricSet extends MetricSet_1.MetricSet {
    constructor(dataTTL) {
        super();
        this.dataTTL = dataTTL || CachedMetricSet.DEFAULT_DATA_TTL;
    }
    /**
     * Do not collect data if our cached copy of data is valid.
     * The purpose is to minimize the cost to collect system metric.
     */
    async refreshIfNecessary() {
        let current = Date.now();
        if (!this.lastCollectTime || current - this.lastCollectTime > this.dataTTL * 1000) {
            await this.getValueInternal();
            // update the last collect time stamp
            this.lastCollectTime = current;
        }
    }
}
CachedMetricSet.DEFAULT_DATA_TTL = 60;
exports.CachedMetricSet = CachedMetricSet;
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