vwo-fme-node-sdk
Version:
VWO Node/JavaScript SDK for Feature Management and Experimentation
81 lines • 3.84 kB
JavaScript
;
/**
* Copyright 2024-2025 Wingify Software Pvt. Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.DecisionMaker = void 0;
var Hasher = require("murmurhash");
var SEED_VALUE = 1; // Seed value for the hash function
var DecisionMaker = /** @class */ (function () {
function DecisionMaker() {
}
/**
* Generates a bucket value based on the hash value, maximum value, and an optional multiplier.
*
* @param {number} hashValue - The hash value used for calculation
* @param {number} maxValue - The maximum value for bucket scaling
* @param {number} [multiplier=1] - Optional multiplier to adjust the value
* @returns {number} - The calculated bucket value
*/
DecisionMaker.prototype.generateBucketValue = function (hashValue, maxValue, multiplier) {
if (multiplier === void 0) { multiplier = 1; }
// Calculate the ratio based on the hash value
var ratio = hashValue / Math.pow(2, 32);
// Calculate the multiplied value
var multipliedValue = (maxValue * ratio + 1) * multiplier;
// Round down to get the final value
var value = Math.floor(multipliedValue);
return value;
};
/**
* Gets the bucket value for a user based on the hash key and maximum value.
*
* @param {string} hashKey - The hash key for the user
* @param {number} [maxValue=100] - The maximum value for bucket scaling
* @returns {number} - The calculated bucket value for the user
*/
DecisionMaker.prototype.getBucketValueForUser = function (hashKey, maxValue) {
if (maxValue === void 0) { maxValue = 100; }
var hashValue = Hasher.v3(hashKey, SEED_VALUE); // Calculate the hash value
var bucketValue = this.generateBucketValue(hashValue, maxValue); // Calculate the bucket value
return bucketValue; // Return the calculated bucket value
};
/**
* Calculates the bucket value for a given string with optional multiplier and maximum value.
*
* @param {string} str - The input string to calculate the bucket value for
* @param {number} [multiplier=1] - Optional multiplier to adjust the value
* @param {number} [maxValue=10000] - The maximum value for bucket scaling
* @returns {number} - The calculated bucket value
*/
DecisionMaker.prototype.calculateBucketValue = function (str, multiplier, maxValue) {
if (multiplier === void 0) { multiplier = 1; }
if (maxValue === void 0) { maxValue = 10000; }
var hashValue = this.generateHashValue(str); // Generate the hash value for the input string
return this.generateBucketValue(hashValue, maxValue, multiplier); // Generate and return the bucket value
};
/**
* Generates the hash value for a given hash key using murmurHash v3.
*
* @param {string} hashKey - The hash key for which the hash value is generated
* @returns {number} - The generated hash value
*/
DecisionMaker.prototype.generateHashValue = function (hashKey) {
return Hasher.v3(hashKey, SEED_VALUE); // Return the hash value generated using murmurHash
};
return DecisionMaker;
}());
exports.DecisionMaker = DecisionMaker;
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