feature: configurable max prefetch request count (#2632)

* feature: configurable max prefetch request count

* update name and default value for prefetch number

Co-authored-by: Stefan Silviu <silviu.stefan@atta.systems>

platform/core/src/classes/StudyPrefetcher.js

@@ -11,6 +11,7 @@ export class StudyPrefetcher {
     requestType: 'prefetch',
     preventCache: false,
     prefetchDisplaySetsTimeout: 300,
+    maxNumPrefetchRequests: 100,
     includeActiveDisplaySet: false,
   };
 
@@ -151,6 +152,11 @@ export class StudyPrefetcher {
     const nonCachedImageIds = this.filterCachedImageIds(imageIds);
     const imageLoadPoolManager = cornerstone.imageLoadPoolManager;
 
+    imageLoadPoolManager.maxNumRequests = {
+      ...imageLoadPoolManager.maxNumRequests,
+      prefetch: this.options.maxNumPrefetchRequests,
+    };
+
     let requestFn;
     if (this.options.preventCache) {
       requestFn = id => cornerstone.loadImage(id);

platform/viewer/public/config/default.js

@@ -11,6 +11,7 @@ window.config = {
     displaySetCount: 3,
     preventCache: false,
     prefetchDisplaySetsTimeout: 300,
+    maxNumPrefetchRequests: 100,
     displayProgress: true,
     includeActiveDisplaySet: true,
   },