mirror of
https://github.com/JasonYANG170/IOTConnect-Web.git
synced 2024-11-23 20:26:28 +00:00
53 lines
1.6 KiB
JavaScript
53 lines
1.6 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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const lru_cache_1 = require("lru-cache");
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const number_allocator_1 = require("number-allocator");
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class TopicAliasSend {
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constructor(max) {
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if (max > 0) {
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this.aliasToTopic = new lru_cache_1.LRUCache({ max });
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this.topicToAlias = {};
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this.numberAllocator = new number_allocator_1.NumberAllocator(1, max);
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this.max = max;
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this.length = 0;
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}
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}
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put(topic, alias) {
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if (alias === 0 || alias > this.max) {
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return false;
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}
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const entry = this.aliasToTopic.get(alias);
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if (entry) {
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delete this.topicToAlias[entry];
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}
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this.aliasToTopic.set(alias, topic);
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this.topicToAlias[topic] = alias;
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this.numberAllocator.use(alias);
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this.length = this.aliasToTopic.size;
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return true;
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}
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getTopicByAlias(alias) {
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return this.aliasToTopic.get(alias);
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}
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getAliasByTopic(topic) {
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const alias = this.topicToAlias[topic];
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if (typeof alias !== 'undefined') {
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this.aliasToTopic.get(alias);
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}
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return alias;
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}
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clear() {
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this.aliasToTopic.clear();
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this.topicToAlias = {};
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this.numberAllocator.clear();
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this.length = 0;
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}
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getLruAlias() {
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const alias = this.numberAllocator.firstVacant();
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if (alias)
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return alias;
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return [...this.aliasToTopic.keys()][this.aliasToTopic.size - 1];
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}
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}
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exports.default = TopicAliasSend;
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//# sourceMappingURL=topic-alias-send.js.map
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