Initial commit from prod-batam

extensions/cornerstone/src/initStudyPrefetcherService.ts

@@ -0,0 +1,33 @@
+import { cache, imageLoadPoolManager, imageLoader, Enums, eventTarget, EVENTS as csEvents } from '@cornerstonejs/core';
+
+function initStudyPrefetcherService(servicesManager: AppTypes.ServicesManager) {
+  const { studyPrefetcherService } = servicesManager.services;
+
+  studyPrefetcherService.requestType = Enums.RequestType.Prefetch;
+  studyPrefetcherService.imageLoadPoolManager = imageLoadPoolManager;
+  studyPrefetcherService.imageLoader = imageLoader;
+
+  studyPrefetcherService.cache = {
+    isImageCached(imageId: string): boolean {
+      return !!cache.getImageLoadObject(imageId);
+    }
+  }
+
+  studyPrefetcherService.imageLoadEventsManager = {
+    addEventListeners(onImageLoaded, onImageLoadFailed) {
+      eventTarget.addEventListener(csEvents.IMAGE_LOADED, onImageLoaded);
+      eventTarget.addEventListener(csEvents.IMAGE_LOAD_FAILED, onImageLoadFailed);
+
+      return [
+        {
+          unsubscribe: () => eventTarget.removeEventListener(csEvents.IMAGE_LOADED, onImageLoaded)
+        },
+        {
+          unsubscribe: () => eventTarget.removeEventListener(csEvents.IMAGE_LOAD_FAILED, onImageLoadFailed)
+        },
+      ]
+    }
+  }
+}
+
+export default initStudyPrefetcherService;