72 lines
2.3 KiB
JavaScript
72 lines
2.3 KiB
JavaScript
import RetrieveMetadata from './services/wado/retrieveMetadata.js';
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const moduleName = 'RetrieveStudyMetadata';
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// Cache for promises. Prevents unnecessary subsequent calls to the server
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const StudyMetaDataPromises = new Map();
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/**
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* Retrieves study metadata
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*
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* @param {Object} server Object with server configuration parameters
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* @param {string} StudyInstanceUID The UID of the Study 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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* @returns {Promise} that will be resolved with the metadata or rejected with the error
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*/
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export function retrieveStudyMetadata(
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dicomWebClient,
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StudyInstanceUID,
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enableStudyLazyLoad,
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filters
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) {
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// @TODO: Whenever a study metadata request has failed, its related promise will be rejected once and for all
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// and further requests for that metadata will always fail. On failure, we probably need to remove the
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// corresponding promise from the "StudyMetaDataPromises" map...
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if (!dicomWebClient) {
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throw new Error(
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`${moduleName}: Required 'dicomWebClient' parameter not provided.`
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);
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}
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if (!StudyInstanceUID) {
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throw new Error(
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`${moduleName}: Required 'StudyInstanceUID' parameter not provided.`
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);
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}
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// Already waiting on result? Return cached promise
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if (StudyMetaDataPromises.has(StudyInstanceUID)) {
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return StudyMetaDataPromises.get(StudyInstanceUID);
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}
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// Create a promise to handle the data retrieval
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const promise = new Promise((resolve, reject) => {
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RetrieveMetadata(
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dicomWebClient,
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StudyInstanceUID,
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enableStudyLazyLoad,
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filters
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).then(function(data) {
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resolve(data);
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}, reject);
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});
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// Store the promise in cache
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StudyMetaDataPromises.set(StudyInstanceUID, promise);
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return promise;
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}
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/**
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* Delete the cached study metadata retrieval promise to ensure that the browser will
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* re-retrieve the study metadata when it is next requested
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*
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* @param {String} StudyInstanceUID The UID of the Study to be removed from cache
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*
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*/
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export function deleteStudyMetadataPromise(StudyInstanceUID) {
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if (StudyMetaDataPromises.has(StudyInstanceUID)) {
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StudyMetaDataPromises.delete(StudyInstanceUID);
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}
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}
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