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import { ExtensionManager } from '../../extensions';
import ServicesManager from '../ServicesManager';
import ViewportGridService from '../ViewportGridService';
import { DisplaySet } from '../../types';
enum RequestType {
/** Highest priority for loading*/
Interaction = 'interaction',
/** Second highest priority for loading*/
Thumbnail = 'thumbnail',
/** Third highest priority for loading, usually used for image loading in the background*/
Prefetch = 'prefetch',
/** Lower priority, often used for background computations in the worker */
Compute = 'compute',
}
export const EVENTS = {
SERVICE_STARTED: 'event::studyPrefetcherService:started',
SERVICE_STOPPED: 'event::studyPrefetcherService:stopped',
DISPLAYSET_LOAD_PROGRESS: 'event::studyPrefetcherService:displaySetLoadProgress',
DISPLAYSET_LOAD_COMPLETE: 'event::studyPrefetcherService:displaySetLoadComplete',
};
/**
* Order used for prefetching display set
*/
enum StudyPrefetchOrder {
closest = 'closest',
downward = 'downward',
upward = 'upward',
}
/**
* Study Prefetcher configuration
*/
type StudyPrefetcherConfig = {
/* Enable/disable study prefetching service */
enabled: boolean;
/* Number of displaysets to be prefetched */
displaySetsCount: number;
/**
* Max number of concurrent prefetch requests
* High numbers may impact on the time to load a new dropped series because
* the browser will be busy with all prefetching requests. As soon as the
* prefetch requests get fulfilled the new ones from the new dropped series
* are sent to the server.
*
* TODO: abort all prefetch requests when a new series is loaded on a viewport.
* (need to add support for `AbortController` on Cornerstone)
* */
maxNumPrefetchRequests: number;
/* Display sets prefetching order (closest, downward and upward) */
order: StudyPrefetchOrder;
};
type DisplaySetLoadingState = {
displaySetInstanceUID: string;
numInstances: number;
pendingImageIds: Set<string>;
loadedImageIds: Set<string>;
failedImageIds: Set<string>;
loadingProgress: number;
};
type ImageRequest = {
displaySetInstanceUID: string;
imageId: string;
aborted: boolean;
};
type PubSubServiceSubscription = { unsubscribe: () => any };
interface ICache {
isImageCached(imageId: string): boolean;
}
interface IImageLoadPoolManager {
addRequest(
requestFn: () => Promise<any>,
type: string,
additionalDetails: Record<string, unknown>,
priority?: number
);
clearRequestStack(type: string): void;
}
interface IImageLoader {
loadAndCacheImage(imageId: string, options: any): Promise<any>;
}
type EventSubscription = {
unsubscribe: () => void;
};
interface IImageLoadEventsManager {
addEventListeners(
onImageLoaded: (evt: any) => void,
onImageLoadFailed: (evt: any) => void
): EventSubscription[];
}
class StudyPrefetcherService extends PubSubService {
private _extensionManager: ExtensionManager;
private _servicesManager: ServicesManager;
private _subscriptions: PubSubServiceSubscription[];
private _activeDisplaySetsInstanceUIDs: string[] = [];
private _pendingRequests: ImageRequest[] = [];
private _inflightRequests = new Map<string, ImageRequest>();
private _isRunning = false;
private _displaySetLoadingStates = new Map<string, DisplaySetLoadingState>();
private _imageIdsToDisplaySetsMap = new Map<string, Set<string>>();
private config: StudyPrefetcherConfig = {
/* Enable/disable study prefetching service */
enabled: false,
/* Number of displaysets to be prefetched */
displaySetsCount: 1,
/**
* Max number of concurrent prefetch requests
* High numbers may impact on the time to load a new dropped series because
* the browser will be busy with all prefetching requests. As soon as the
* prefetch requests get fulfilled the new ones from the new dropped series
* are sent to the server.
*
* TODO: abort all prefetch requests when a new series is loaded on a viewport.
* (need to add support for `AbortController` on Cornerstone)
* */
maxNumPrefetchRequests: 10,
/* Display sets prefetching order (closest, downward and upward) */
order: StudyPrefetchOrder.downward,
};
// Properties set by Cornerstone extension (initStudyPrefetcherService)
public requestType: string = RequestType.Prefetch;
public cache: ICache;
public imageLoadPoolManager: IImageLoadPoolManager;
public imageLoader: IImageLoader;
public imageLoadEventsManager: IImageLoadEventsManager;
public static REGISTRATION = {
name: 'studyPrefetcherService',
altName: 'StudyPrefetcherService',
create: ({ configuration, servicesManager, extensionManager }): StudyPrefetcherService => {
return new StudyPrefetcherService({
servicesManager,
extensionManager,
configuration,
});
},
};
constructor({
servicesManager,
extensionManager,
configuration,
}: {
servicesManager: ServicesManager;
extensionManager: ExtensionManager;
configuration: StudyPrefetcherConfig;
}) {
super(EVENTS);
this._servicesManager = servicesManager;
this._extensionManager = extensionManager;
this._subscriptions = [];
Object.assign(this.config, configuration);
}
public onModeEnter(): void {
this._addEventListeners();
}
/**
* The onModeExit returns the service to the initial state.
*/
public onModeExit(): void {
this._removeEventListeners();
this._stopPrefetching();
}
private _addImageLoadingEventsListeners() {
const fnOnImageLoadCompleted = (imageId: string) => {
// `sendNextRequests` must be called after image loaded/failed events
// to make sure prefetch requests shall be sent as soon as the active
// displaySets (active viewport) are loaded.
//
// PS: active display sets are not loaded by this service and that is why
// the requests shall not be in the inflight queue.
if (!this._inflightRequests.get(imageId)) {
this._sendNextRequests();
}
};
const fnImageLoadedEventListener = evt => {
const { image } = evt.detail;
const { imageId } = image;
this._moveImageIdToLoadedSet(imageId);
fnOnImageLoadCompleted(imageId);
};
const fnImageLoadFailedEventListener = evt => {
const { imageId } = evt.detail;
this._moveImageIdToFailedSet(imageId);
fnOnImageLoadCompleted(imageId);
};
return this.imageLoadEventsManager.addEventListeners(
fnImageLoadedEventListener,
fnImageLoadFailedEventListener
);
}
private _addServicesListeners() {
const { displaySetService, viewportGridService } = this._servicesManager.services;
// Restart the prefetcher after any change to the displaySets
// (eg: sorting the displaySets on StudyBrowser)
const displaySetsChangedSubscription = displaySetService.subscribe(
displaySetService.EVENTS.DISPLAY_SETS_CHANGED,
() => this._syncWithActiveViewport({ forceRestart: true })
);
// Loads new datasets when making a new viewport active
const viewportGridActiveViewportIdSubscription = viewportGridService.subscribe(
ViewportGridService.EVENTS.ACTIVE_VIEWPORT_ID_CHANGED,
({ viewportId }) => this._syncWithActiveViewport({ activeViewportId: viewportId })
);
// Continue loading datasets after changing the layout (eg: from 1x1 to 2x1)
const viewportGridLayoutChangedSubscription = viewportGridService.subscribe(
ViewportGridService.EVENTS.LAYOUT_CHANGED,
() => this._syncWithActiveViewport()
);
// Loads new datasets after loading a new display set on a viewport
const viewportGridStateChangedSubscription = viewportGridService.subscribe(
ViewportGridService.EVENTS.GRID_STATE_CHANGED,
() => this._syncWithActiveViewport()
);
// Loads the first datasets right after opening the viewer
const viewportGridViewportreadySubscription = viewportGridService.subscribe(
ViewportGridService.EVENTS.VIEWPORTS_READY,
() => {
this._syncWithActiveViewport();
this._startPrefetching();
}
);
return [
displaySetsChangedSubscription,
viewportGridActiveViewportIdSubscription,
viewportGridLayoutChangedSubscription,
viewportGridStateChangedSubscription,
viewportGridViewportreadySubscription,
];
}
private _addEventListeners() {
const imageLoadingEventsSubscriptions = this._addImageLoadingEventsListeners();
const servicesSubscriptions = this._addServicesListeners();
this._subscriptions.push(...imageLoadingEventsSubscriptions);
this._subscriptions.push(...servicesSubscriptions);
}
private _removeEventListeners() {
this._subscriptions.forEach(subscription => subscription.unsubscribe());
this._subscriptions = [];
}
private _syncWithActiveViewport({
activeViewportId,
forceRestart,
}: {
activeViewportId?: string;
forceRestart?: boolean;
} = {}) {
const { viewportGridService } = this._servicesManager.services;
const viewportGridServiceState = viewportGridService.getState();
const { viewports } = viewportGridServiceState;
activeViewportId = activeViewportId ?? viewportGridServiceState.activeViewportId;
// If may be null when the viewer is loaded
if (!activeViewportId) {
return;
}
const activeViewport = viewports.get(activeViewportId);
const displaySetUpdated = this._setActiveDisplaySetsUIDs(activeViewport.displaySetInstanceUIDs);
if (forceRestart || displaySetUpdated) {
this._restartPrefetching();
}
}
private _setActiveDisplaySetsUIDs(newActiveDisplaySetInstanceUIDs: string[]): boolean {
const sameDisplaySets =
newActiveDisplaySetInstanceUIDs.length === this._activeDisplaySetsInstanceUIDs.length &&
newActiveDisplaySetInstanceUIDs.every(uid =>
this._activeDisplaySetsInstanceUIDs.includes(uid)
);
if (sameDisplaySets) {
return false;
}
this._activeDisplaySetsInstanceUIDs = [...newActiveDisplaySetInstanceUIDs];
this._restartPrefetching();
return true;
}
private _areActiveDisplaySetsLoaded() {
const { _activeDisplaySetsInstanceUIDs: displaySetsInstanceUIDs } = this;
return (
displaySetsInstanceUIDs.length &&
displaySetsInstanceUIDs.every(
displaySetsInstanceUID =>
this._displaySetLoadingStates.get(displaySetsInstanceUID).loadingProgress >= 1
)
);
}
private _getClosestDisplaySets(displaySets: DisplaySet[], activeDisplaySetIndex: number) {
const sortedDisplaySets = [];
let previousIndex = activeDisplaySetIndex - 1;
let nextIndex = activeDisplaySetIndex + 1;
while (previousIndex >= 0 || nextIndex < displaySets.length) {
Iif (previousIndex >= 0) {
sortedDisplaySets.push(displaySets[previousIndex]);
previousIndex--;
}
Iif (nextIndex < displaySets.length) {
sortedDisplaySets.push(displaySets[nextIndex]);
nextIndex++;
}
}
return sortedDisplaySets;
}
private _getDownwardDisplaySets(displaySets: DisplaySet[], activeDisplaySetIndex: number) {
const sortedDisplaySets = [];
for (let i = activeDisplaySetIndex + 1; i < displaySets.length; i++) {
sortedDisplaySets.push(displaySets[i]);
}
return sortedDisplaySets;
}
private _getUpwardDisplaySets(displaySets: DisplaySet[], activeDisplaySetIndex: number) {
const sortedDisplaySets = [];
for (let i = activeDisplaySetIndex - 1; i >= 0 && i !== activeDisplaySetIndex; i--) {
sortedDisplaySets.push(displaySets[i]);
}
return sortedDisplaySets;
}
private _getSortedDisplaySetsToPrefetch(displaySets: DisplaySet[]): DisplaySet[] {
Iif (!this._activeDisplaySetsInstanceUIDs?.length) {
return [];
}
const { displaySetsCount } = this.config;
const activeDisplaySetsInstanceUIDs = this._activeDisplaySetsInstanceUIDs;
const [activeDisplaySetUID] = activeDisplaySetsInstanceUIDs;
const activeDisplaySetIndex = displaySets.findIndex(
ds => ds.displaySetInstanceUID === activeDisplaySetUID
);
const getDisplaySetsFunctionsMap = {
[StudyPrefetchOrder.closest]: this._getClosestDisplaySets,
[StudyPrefetchOrder.downward]: this._getDownwardDisplaySets,
[StudyPrefetchOrder.upward]: this._getUpwardDisplaySets,
};
const { order } = this.config;
const fnGetDisplaySets = getDisplaySetsFunctionsMap[order];
Iif (!fnGetDisplaySets) {
throw new Error(`Invalid order (${order})`);
}
// Creates a `Set` to look for UIDs in O(1) instead of O(n)
const uidsSet = new Set(activeDisplaySetsInstanceUIDs);
// Remove any active displaySet that may still be in the activeDisplaySetsInstanceUIDs.
// That may happen when activeDisplaySetsInstanceUIDs has more than one element.
return fnGetDisplaySets
.call(this, displaySets, activeDisplaySetIndex)
.filter(ds => !uidsSet.has(ds.displaySetInstanceUID))
.slice(0, displaySetsCount);
}
private _getDisplaySets() {
const { displaySetService } = this._servicesManager.services;
const displaySets = [...displaySetService.getActiveDisplaySets()];
const displaySetsToPrefetch = this._getSortedDisplaySetsToPrefetch(displaySets);
return { displaySets, displaySetsToPrefetch };
}
private _updateImageIdsDisplaySetMap(displaySetInstanceUID: string, imageIds: string[]): void {
for (const imageId of imageIds) {
let displaySetsInstanceUIDsMap = this._imageIdsToDisplaySetsMap.get(imageId);
Iif (!displaySetsInstanceUIDsMap) {
displaySetsInstanceUIDsMap = new Set();
this._imageIdsToDisplaySetsMap.set(imageId, displaySetsInstanceUIDsMap);
}
displaySetsInstanceUIDsMap.add(displaySetInstanceUID);
}
}
private _getImageIdsForDisplaySet(displaySet: DisplaySet): string[] {
const dataSource = this._extensionManager.getActiveDataSource()[0];
return dataSource.getImageIdsForDisplaySet(displaySet);
}
private _updateDisplaySetLoadingProgress(displaySetLoadingState: DisplaySetLoadingState) {
const { numInstances, loadedImageIds, failedImageIds } = displaySetLoadingState;
const loadingProgress = (loadedImageIds.size + failedImageIds.size) / numInstances;
displaySetLoadingState.loadingProgress = loadingProgress;
}
private _addDisplaySetLoadingState(displaySet: DisplaySet): void {
const { displaySetInstanceUID } = displaySet;
const imageIds = this._getImageIdsForDisplaySet(displaySet);
let displaySetLoadingState = this._displaySetLoadingStates.get(displaySetInstanceUID);
Iif (displaySetLoadingState) {
return;
}
const pendingImageIds = new Set<string>(imageIds);
const loadedImageIds = new Set<string>();
// Needs to check which image is already loaded to update the progress properly
// because some images may already be loaded (thumbnails and viewports).
for (const imageId of imageIds) {
if (this.cache.isImageCached(imageId)) {
loadedImageIds.add(imageId);
} else {
pendingImageIds.add(imageId);
}
}
displaySetLoadingState = {
displaySetInstanceUID,
numInstances: imageIds.length,
pendingImageIds,
loadedImageIds,
failedImageIds: new Set(),
loadingProgress: 0,
};
this._updateDisplaySetLoadingProgress(displaySetLoadingState);
this._displaySetLoadingStates.set(displaySetInstanceUID, displaySetLoadingState);
this._updateImageIdsDisplaySetMap(displaySetInstanceUID, imageIds);
// Notify the UI that something is already loaded (eg: update StudyBrowser)
Iif (loadedImageIds.size) {
this._triggerDisplaySetEvents(displaySetInstanceUID);
}
}
private _loadDisplaySets() {
const { displaySets, displaySetsToPrefetch } = this._getDisplaySets();
displaySets.forEach(displaySet => this._addDisplaySetLoadingState(displaySet));
displaySetsToPrefetch.forEach(displaySet => this._enqueueDisplaySetImagesRequests(displaySet));
}
private _moveImageIdToLoadedSet(imageId: string): boolean {
const displaySetsInstanceUIDs = this._imageIdsToDisplaySetsMap.get(imageId);
if (!displaySetsInstanceUIDs) {
return;
}
for (const displaySetInstanceUID of Array.from(displaySetsInstanceUIDs.values())) {
const displaySetLoadingState = this._displaySetLoadingStates.get(displaySetInstanceUID);
const { pendingImageIds, loadedImageIds } = displaySetLoadingState;
pendingImageIds.delete(imageId);
loadedImageIds.add(imageId);
this._updateDisplaySetLoadingProgress(displaySetLoadingState);
this._triggerDisplaySetEvents(displaySetInstanceUID);
}
return true;
}
private _moveImageIdToFailedSet(imageId: string): boolean {
const displaySetsInstanceUIDs = this._imageIdsToDisplaySetsMap.get(imageId);
Iif (!displaySetsInstanceUIDs) {
return;
}
for (const displaySetInstanceUID of Array.from(displaySetsInstanceUIDs.values())) {
const displaySetLoadingState = this._displaySetLoadingStates.get(displaySetInstanceUID);
const { pendingImageIds, failedImageIds } = displaySetLoadingState;
pendingImageIds.delete(imageId);
failedImageIds.add(imageId);
this._updateDisplaySetLoadingProgress(displaySetLoadingState);
this._triggerDisplaySetEvents(displaySetInstanceUID);
}
return true;
}
private _triggerDisplaySetEvents(displaySetInstanceUID: string) {
const displaySetLoadingState = this._displaySetLoadingStates.get(displaySetInstanceUID);
const { loadingProgress, numInstances } = displaySetLoadingState;
this._broadcastEvent(this.EVENTS.DISPLAYSET_LOAD_PROGRESS, {
displaySetInstanceUID,
numInstances,
loadingProgress,
});
Iif (loadingProgress >= 1) {
this._broadcastEvent(this.EVENTS.DISPLAYSET_LOAD_COMPLETE, {
displaySetInstanceUID,
});
}
}
private _onImagePrefetchSuccess(imageRequest: ImageRequest) {
Iif (imageRequest.aborted) {
return;
}
const { imageId } = imageRequest;
this._inflightRequests.delete(imageId);
this._moveImageIdToLoadedSet(imageId);
// `sendNextRequests` must be called after removing the request from the inflight
// queue otherwise it shall not be able to send the request (maxNumPrefetchRequests)
this._sendNextRequests();
}
private _onImagePrefetchFailed(imageRequest, error) {
Iif (imageRequest.aborted) {
return;
}
console.warn(`An error ocurred when trying to load "${imageRequest.imageId}"`, error);
const { imageId } = imageRequest;
this._inflightRequests.delete(imageId);
this._moveImageIdToFailedSet(imageId);
// `sendNextRequests` must be called after removing the request from the inflight
// queue otherwise it shall not be able to send the request (maxNumPrefetchRequests)
this._sendNextRequests();
}
private async _sendNextRequests() {
// If the service has stopped with async requests in progress this method may
// get called again when each of those requests are fulfilled.
if (!this._isRunning) {
return;
}
// Does not send any prefetch request until the active display sets are loaded
Iif (!this._areActiveDisplaySetsLoaded()) {
return;
}
const { _pendingRequests: pendingRequests, _inflightRequests: inflightRequests } = this;
const { maxNumPrefetchRequests } = this.config;
Iif (!pendingRequests.length || inflightRequests.size >= maxNumPrefetchRequests) {
return;
}
const numImageRequests = Math.min(
pendingRequests.length,
maxNumPrefetchRequests - inflightRequests.size
);
const imageRequests = this._pendingRequests.splice(0, numImageRequests);
imageRequests.forEach(imageRequest => {
const { imageId } = imageRequest;
const options = {
priority: -5,
requestType: this.requestType,
additionalDetails: { imageId },
preScale: {
enabled: true,
},
};
this.imageLoadPoolManager.addRequest(
async () =>
this.imageLoader.loadAndCacheImage(imageId, options).then(
_image => this._onImagePrefetchSuccess(imageRequest),
error => this._onImagePrefetchFailed(imageRequest, error)
),
this.requestType,
{ imageId }
);
inflightRequests.set(imageId, imageRequest);
});
}
private _enqueueDisplaySetImagesRequests(displaySet: DisplaySet) {
const { displaySetInstanceUID } = displaySet;
const imageIds = this._getImageIdsForDisplaySet(displaySet);
imageIds.forEach(imageId => {
Iif (this.cache.isImageCached(imageId)) {
this._moveImageIdToLoadedSet(imageId);
return;
}
this._pendingRequests.push({
displaySetInstanceUID,
imageId,
aborted: false,
});
});
}
/**
* Start prefetching the display sets based on the active viewport and app configuration.
*/
private _startPrefetching(): void {
Iif (this._isRunning) {
return;
}
if (!this.config.enabled) {
console.log('StudyPrefetcher is not enabled');
return;
}
this._isRunning = true;
this._loadDisplaySets();
this._sendNextRequests();
this._broadcastEvent(this.EVENTS.SERVICE_STARTED, {});
}
/**
* Stop prefetching the display sets.
* All internal variables are cleared but activeDisplaySetsInstanceUIDs otherwise restart would not work.
*/
private _stopPrefetching(): void {
Iif (!this._isRunning) {
return;
}
this._isRunning = false;
// Mark all inflight requests as aborted before clearing the map.
this._inflightRequests.forEach(inflightRequest => (inflightRequest.aborted = true));
this._pendingRequests = [];
this._displaySetLoadingStates.clear();
this._imageIdsToDisplaySetsMap.clear();
this._inflightRequests.clear();
this.imageLoadPoolManager.clearRequestStack(this.requestType);
this._broadcastEvent(this.EVENTS.SERVICE_STOPPED, {});
}
/**
* Restart prefetching in case it is already running.
*/
private _restartPrefetching(): void {
Iif (this._isRunning) {
this._stopPrefetching();
this._startPrefetching();
}
}
}
export { StudyPrefetcherService as default, StudyPrefetcherService };
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