Class RequestManager

library/src/main/java/com/bumptech/glide/RequestManager.java:57–772

A class for managing and starting requests for Glide. Can use activity, fragment and connectivity lifecycle events to intelligently stop, start, and restart requests. Retrieve either by instantiating a new object, or to take advantage built in Activity and Fragment lifecycle handling, use the static

 * @see Glide#with(Context)
 */
public class RequestManager
    implements ComponentCallbacks2, LifecycleListener, ModelTypes<RequestBuilder<Drawable>> {
  private static final RequestOptions DECODE_TYPE_BITMAP = decodeTypeOf(Bitmap.class).lock();
  private static final RequestOptions DECODE_TYPE_GIF = decodeTypeOf(GifDrawable.class).lock();
  private static final RequestOptions DOWNLOAD_ONLY_OPTIONS =
      diskCacheStrategyOf(DiskCacheStrategy.DATA).priority(Priority.LOW).skipMemoryCache(true);

  protected final Glide glide;
  protected final Context context;

  @SuppressWarnings("WeakerAccess")
  @Synthetic
  final Lifecycle lifecycle;

  @GuardedBy("this")
  private final RequestTracker requestTracker;

  @GuardedBy("this")
  private final RequestManagerTreeNode treeNode;

  @GuardedBy("this")
  private final TargetTracker targetTracker = new TargetTracker();

  private final Runnable addSelfToLifecycle =
      new Runnable() {
        @Override
        public void run() {
          lifecycle.addListener(RequestManager.this);
        }
      };
  private final ConnectivityMonitor connectivityMonitor;
  // Adding default listeners should be much less common than starting new requests. We want
  // some way of making sure that requests don't mutate our listeners without creating a new copy of
  // the list each time a request is started.
  private final CopyOnWriteArrayList<RequestListener<Object>> defaultRequestListeners;

  @GuardedBy("this")
  private RequestOptions requestOptions;

  private boolean pauseAllRequestsOnTrimMemoryModerate;

  private boolean clearOnStop;

  public RequestManager(
      @NonNull Glide glide,
      @NonNull Lifecycle lifecycle,
      @NonNull RequestManagerTreeNode treeNode,
      @NonNull Context context) {
    this(
        glide,
        lifecycle,
        treeNode,
        new RequestTracker(),
        glide.getConnectivityMonitorFactory(),
        context);
  }

  // Our usage is safe here.