cod-dicomweb-server/dist/esm/fileManager.js

A wadors server proxy that get data from a Cloud Optimized Dicom format.

import { getDataRetrievalManager } from './dataRetrieval/dataRetrievalManager';
class FileManager {
    files = {};
    fileStreamingScriptName;
    constructor({ fileStreamingScriptName }) {
        this.fileStreamingScriptName = fileStreamingScriptName;
    }
    set(url, file) {
        this.files[url] = file;
    }
    get(url, offsets) {
        if (!this.files[url] || (offsets && this.files[url].position <= offsets.endByte)) {
            return null;
        }
        return offsets ? this.files[url].data.slice(offsets.startByte, offsets.endByte) : this.files[url].data;
    }
    setPosition(url, position) {
        if (this.files[url]) {
            this.files[url].position = position;
        }
    }
    getPosition(url) {
        return this.files[url]?.position;
    }
    append(url, chunk, position) {
        if (this.files[url] && position) {
            this.files[url].data.set(chunk, position - chunk.length);
            this.setPosition(url, position);
        }
    }
    getTotalSize() {
        return Object.entries(this.files).reduce((total, [url, { position }]) => {
            return url.includes('?bytes=') ? total : total + position;
        }, 0);
    }
    remove(url) {
        const removedSize = this.getPosition(url);
        delete this.files[url];
        if (url.includes('?bytes=')) {
            return;
        }
        const retrievalManager = getDataRetrievalManager();
        retrievalManager.executeTask(this.fileStreamingScriptName, 'decreaseFetchedSize', removedSize);
    }
    purge() {
        const totalSize = this.getTotalSize();
        this.files = {};
        const retrievalManager = getDataRetrievalManager();
        retrievalManager.executeTask(this.fileStreamingScriptName, 'decreaseFetchedSize', totalSize);
    }
}
export default FileManager;