topic-alias-recv.ts•1.06 kB
/**
* Topic Alias receiving manager
* This holds alias to topic map
* @param {Number} [max] - topic alias maximum entries
*/
export default class TopicAliasRecv {
private aliasToTopic: Record<number, string>
public max: number
public length: number
constructor(max: number) {
this.aliasToTopic = {}
this.max = max
}
/**
* Insert or update topic - alias entry.
* @param {String} [topic] - topic
* @param {Number} [alias] - topic alias
* @returns {Boolean} - if success return true otherwise false
*/
put(topic: string, alias: number): boolean {
if (alias === 0 || alias > this.max) {
return false
}
this.aliasToTopic[alias] = topic
this.length = Object.keys(this.aliasToTopic).length
return true
}
/**
* Get topic by alias
* @param {String} [topic] - topic
* @returns {Number} - if mapped topic exists return topic alias, otherwise return undefined
*/
getTopicByAlias(alias: number): string {
return this.aliasToTopic[alias]
}
/**
* Clear all entries
*/
clear() {
this.aliasToTopic = {}
}
}