diffusion/src/internal/topics/details/topic-specification-serialiser.js

Diffusion JavaScript client

"use strict";
/**
 * @module Topics
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.write = exports.read = void 0;
var Codec = require("./../../io/codec");
var BEES = require("./../../serialisers/byte-encoded-enum-serialiser");
var uint8array_1 = require("./../../util/uint8array");
var topic_specification_1 = require("../../../topics/topic-specification");
var topic_type_1 = require("../../../topics/topic-type");
var cachedTopicSpecification;
var cachedHash;
var cacheBytesRead;
/**
 * Read a {@link TopicSpecification} from the stream
 *
 * @param bis the input stream
 * @return    the {@link TopicSpecification} that was read
 */
function read(bis) {
    if (cachedHash) {
        var newHash = bis.buffer.subarray(bis.pos, bis.pos + cacheBytesRead);
        if (uint8array_1.isEqualUint8Arrays(newHash, cachedHash)) {
            bis.readMany(cacheBytesRead);
            return cachedTopicSpecification;
        }
    }
    var offset = bis.pos;
    var type = BEES.read(bis, topic_type_1.TopicTypeEnum);
    var properties = Codec.readDictionary(bis, Codec.readString);
    var topicSpecification = new topic_specification_1.TopicSpecification(type, properties);
    cacheBytesRead = bis.pos - offset;
    cachedHash = Uint8Array.from(bis.buffer.subarray(offset, bis.pos));
    cachedTopicSpecification = Object.freeze(topicSpecification);
    return topicSpecification;
}
exports.read = read;
/**
 * Write a {@link TopicSpecification} to the stream
 *
 * @param bos   the output stream
 * @param value the {@link TopicSpecification} to be written
 */
function write(bos, value) {
    BEES.write(bos, value.type);
    Codec.writeDictionary(bos, value.properties, Codec.writeString);
}
exports.write = write;