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import { sortStudySeries } from '@ohif/core/src/utils/sortStudy';
import RetrieveMetadataLoader from './retrieveMetadataLoader';
// Series Date, Series Time, Series Description and Series Number to be included
// in the series metadata query result
const includeField = ['00080021', '00080031', '0008103E', '00200011'].join(',');
export class DeferredPromise {
metadata = undefined;
processFunction = undefined;
internalPromise = undefined;
thenFunction = undefined;
rejectFunction = undefined;
setMetadata(metadata) {
this.metadata = metadata;
}
setProcessFunction(func) {
this.processFunction = func;
}
getPromise() {
return this.start();
}
start() {
Iif (this.internalPromise) {
return this.internalPromise;
}
this.internalPromise = this.processFunction();
// in case then and reject functions called before start
if (this.thenFunction) {
this.then(this.thenFunction);
this.thenFunction = undefined;
}
Iif (this.rejectFunction) {
this.reject(this.rejectFunction);
this.rejectFunction = undefined;
}
return this.internalPromise;
}
then(func) {
if (this.internalPromise) {
return this.internalPromise.then(func);
} else {
this.thenFunction = func;
}
}
reject(func) {
if (this.internalPromise) {
return this.internalPromise.reject(func);
} else {
this.rejectFunction = func;
}
}
}
/**
* Creates an immutable series loader object which loads each series sequentially using the iterator interface.
*
* @param {DICOMWebClient} dicomWebClient The DICOMWebClient instance to be used for series load
* @param {string} studyInstanceUID The Study Instance UID from which series will be loaded
* @param {Array} seriesInstanceUIDList A list of Series Instance UIDs
*
* @returns {Object} Returns an object which supports loading of instances from each of given Series Instance UID
*/
function makeSeriesAsyncLoader(client, studyInstanceUID, seriesInstanceUIDList) {
return Object.freeze({
hasNext() {
return seriesInstanceUIDList.length > 0;
},
next() {
const { seriesInstanceUID, metadata } = seriesInstanceUIDList.shift();
const promise = new DeferredPromise();
promise.setMetadata(metadata);
promise.setProcessFunction(() => {
return client.retrieveSeriesMetadata({
studyInstanceUID,
seriesInstanceUID,
});
});
return promise;
},
});
}
/**
* Class for async load of study metadata.
* It inherits from RetrieveMetadataLoader
*
* It loads the one series and then append to seriesLoader the others to be consumed/loaded
*/
export default class RetrieveMetadataLoaderAsync extends RetrieveMetadataLoader {
/**
* @returns {Array} Array of preLoaders. To be consumed as queue
*/
*getPreLoaders() {
const preLoaders = [];
const { studyInstanceUID, filters: { seriesInstanceUID } = {}, client } = this;
// asking to include Series Date, Series Time, Series Description
// and Series Number in the series metadata returned to better sort series
// in preLoad function
let options = {
studyInstanceUID,
queryParams: {
includefield: includeField,
},
};
Iif (seriesInstanceUID) {
options.queryParams.SeriesInstanceUID = seriesInstanceUID;
preLoaders.push(client.searchForSeries.bind(client, options));
}
// Fallback preloader
preLoaders.push(client.searchForSeries.bind(client, options));
yield* preLoaders;
}
async preLoad() {
const preLoaders = this.getPreLoaders();
const result = await this.runLoaders(preLoaders);
const sortCriteria = this.sortCriteria;
const sortFunction = this.sortFunction;
const { naturalizeDataset } = dcmjs.data.DicomMetaDictionary;
const naturalized = result.map(naturalizeDataset);
return sortStudySeries(naturalized, sortCriteria, sortFunction);
}
async load(preLoadData) {
const { client, studyInstanceUID } = this;
const seriesInstanceUIDs = preLoadData.map(seriesMetadata => {
return { seriesInstanceUID: seriesMetadata.SeriesInstanceUID, metadata: seriesMetadata };
});
const seriesAsyncLoader = makeSeriesAsyncLoader(client, studyInstanceUID, seriesInstanceUIDs);
const promises = [];
while (seriesAsyncLoader.hasNext()) {
const promise = seriesAsyncLoader.next();
promises.push(promise);
}
return {
preLoadData,
promises,
};
}
async posLoad({ preLoadData, promises }) {
return {
preLoadData,
promises,
};
}
}
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