From f7a4a5615544b2ff10ac51776ce0a3ea77a5791f Mon Sep 17 00:00:00 2001
From: Erik Ziegler <erik.sweed@gmail.com>
Date: Wed, 7 Jun 2017 16:53:19 +0200
Subject: [PATCH] Stop prefetching when viewerMain template is destroyed (e.g.
 when you go back to study list)

---
 .../client/components/viewer/viewerMain/viewerMain.js      | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Packages/ohif-viewerbase/client/components/viewer/viewerMain/viewerMain.js b/Packages/ohif-viewerbase/client/components/viewer/viewerMain/viewerMain.js
index 4d9559fbc..6265d0117 100644
--- a/Packages/ohif-viewerbase/client/components/viewer/viewerMain/viewerMain.js
+++ b/Packages/ohif-viewerbase/client/components/viewer/viewerMain/viewerMain.js
@@ -37,6 +37,8 @@ Template.viewerMain.onRendered(() => {
     const { studies } = instance.data;
     const parentElement = instance.$('#layoutManagerTarget').get(0);
     const studyPrefetcher = StudyPrefetcher.getInstance();
+    instance.studyPrefetcher = studyPrefetcher;
+
     const studyLoadingListener = StudyLoadingListener.getInstance();
 
     studyLoadingListener.clear();
@@ -52,6 +54,8 @@ Template.viewerMain.onRendered(() => {
 });
 
 Template.viewerMain.onDestroyed(() => {
+    const instance = Template.instance();
+
     OHIF.log.info('viewerMain onDestroyed');
 
     // Remove the Window resize listener
@@ -67,4 +71,7 @@ Template.viewerMain.onDestroyed(() => {
     ProtocolEngine = null;
 
     Session.set('OHIFViewerMainRendered', false);
+    
+    // Stop prefetching when we close the viewer
+    instance.studyPrefetcher.destroy();
 });