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88 lines
2.7 KiB
88 lines
2.7 KiB
/*
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* node-rdkafka - Node.js wrapper for RdKafka C/C++ library
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*
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* Copyright (c) 2016 Blizzard Entertainment
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*
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* This software may be modified and distributed under the terms
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* of the MIT license. See the LICENSE.txt file for details.
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*/
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var Topic = require('./topic');
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module.exports = TopicPartition;
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/**
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* Map an array of topic partition js objects to real topic partition objects.
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*
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* @param array The array of topic partition raw objects to map to topic
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* partition objects
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*/
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TopicPartition.map = function(array) {
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return array.map(function(element) {
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return TopicPartition.create(element);
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});
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};
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/**
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* Take a topic partition javascript object and convert it to the class.
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* The class will automatically convert offset identifiers to special constants
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*
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* @param element The topic partition raw javascript object
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*/
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TopicPartition.create = function(element) {
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// Just ensure we take something that can have properties. The topic partition
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// class will
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element = element || {};
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return new TopicPartition(element.topic, element.partition, element.offset);
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};
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/**
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* Create a topic partition. Just does some validation and decoration
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* on topic partitions provided.
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*
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* Goal is still to behave like a plain javascript object but with validation
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* and potentially some extra methods
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*/
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function TopicPartition(topic, partition, offset) {
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if (!(this instanceof TopicPartition)) {
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return new TopicPartition(topic, partition, offset);
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}
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// Validate that the elements we are iterating over are actual topic partition
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// js objects. They do not need an offset, but they do need partition
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if (!topic) {
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throw new TypeError('"topic" must be a string and must be set');
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}
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if (partition === null || partition === undefined) {
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throw new TypeError('"partition" must be a number and must set');
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}
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// We can just set topic and partition as they stand.
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this.topic = topic;
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this.partition = partition;
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if (offset === undefined || offset === null) {
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this.offset = Topic.OFFSET_STORED;
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} else if (typeof offset === 'string') {
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switch (offset.toLowerCase()) {
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case 'earliest':
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case 'beginning':
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this.offset = Topic.OFFSET_BEGINNING;
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break;
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case 'latest':
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case 'end':
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this.offset = Topic.OFFSET_END;
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break;
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case 'stored':
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this.offset = Topic.OFFSET_STORED;
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break;
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default:
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throw new TypeError('"offset", if provided as a string, must be beginning, end, or stored.');
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}
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} else if (typeof offset === 'number') {
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this.offset = offset;
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} else {
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throw new TypeError('"offset" must be a special string or number if it is set');
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}
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}
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