1 package com.bumptech.glide.manager; 2 3 import com.bumptech.glide.request.Request; 4 5 import java.util.Collections; 6 import java.util.Set; 7 import java.util.WeakHashMap; 8 9 public class RequestTracker { 10 // Most requests will be for views and will therefore be held strongly (and safely) by the view via the tag. 11 // However, a user can always pass in a different type of target which may end up not being strongly referenced even 12 // though the user still would like the request to finish. Weak references are therefore only really functional in 13 // this context for view targets. Despite the side affects, WeakReferences are still essentially required. A user 14 // can always make repeated requests into targets other than views, or use an activity manager in a fragment pager 15 // where holding strong references would steadily leak bitmaps and/or views. 16 private final Set<Request> requests = Collections.newSetFromMap(new WeakHashMap<Request, Boolean>()); 17 addRequest(Request request)18 public void addRequest(Request request) { 19 requests.add(request); 20 } 21 removeRequest(Request request)22 public void removeRequest(Request request) { 23 requests.remove(request); 24 } 25 26 /** 27 * Stops any in progress requests. 28 */ pauseRequests()29 public void pauseRequests() { 30 for (Request request : requests) { 31 if (!request.isComplete() && !request.isFailed()) { 32 request.clear(); 33 } 34 } 35 } 36 37 /** 38 * Starts any not yet completed or failed requests. 39 */ resumeRequests()40 public void resumeRequests() { 41 for (Request request : requests) { 42 if (!request.isComplete() && !request.isRunning()) { 43 request.run(); 44 } 45 } 46 } 47 48 /** 49 * Cancels all requests and clears their resources. 50 */ clearRequests()51 public void clearRequests() { 52 for (Request request : requests) { 53 request.clear(); 54 } 55 } 56 57 /** 58 * Restarts failed requests and cancels and restarts in progress requests. 59 */ restartRequests()60 public void restartRequests() { 61 for (Request request : requests) { 62 if (request.isFailed()) { 63 request.run(); 64 } else if (!request.isComplete()) { 65 request.clear(); 66 request.run(); 67 } 68 } 69 } 70 } 71