60 lines
1.7 KiB
JavaScript
60 lines
1.7 KiB
JavaScript
/**
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* Class to define inheritance of load retrieve strategy.
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* The process can be async load (lazy) or sync load
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*
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* There are methods that must be implemented at consumer level
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* To retrieve study call execLoad
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*/
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export default class RetrieveMetadataLoader {
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/**
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* @constructor
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* @param {Object} client The dicomweb-client.
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* @param {Array} studyInstanceUID Study instance ui to be retrieved
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* @param {Object} [filters] - Object containing filters to be applied on retrieve metadata process
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* @param {string} [filter.seriesInstanceUID] - series instance uid to filter results against
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*/
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constructor(client, studyInstanceUID, filters = {}) {
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this.client = client;
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this.studyInstanceUID = studyInstanceUID;
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this.filters = filters;
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}
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async execLoad() {
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const preLoadData = await this.preLoad();
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const loadData = await this.load(preLoadData);
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const postLoadData = await this.posLoad(loadData);
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return postLoadData;
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}
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/**
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* It iterates over given loaders running each one. Loaders parameters must be bind when getting it.
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* @param {Array} loaders - array of loader to retrieve data.
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*/
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async runLoaders(loaders) {
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let result;
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for (const loader of loaders) {
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try {
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result = await loader();
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if (result && result.length) {
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break; // closes iterator in case data is retrieved successfully
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}
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} catch (e) {
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throw e;
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}
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}
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if (loaders.next().done && !result) {
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throw new Error('RetrieveMetadataLoader failed');
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}
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return result;
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}
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// Methods to be overwrite
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async configLoad() {}
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async preLoad() {}
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async load(preLoadData) {}
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async posLoad(loadData) {}
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}
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