content: /*
   * Copyright 2019 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package android.webkit;
  
  import android.annotation.NonNull;
  import android.annotation.Nullable;
  
  /**
   * Used to receive callbacks on {@link WebView} renderer events.
   *
   * WebViewRenderProcessClient instances may be set or retrieved via {@link
   * WebView#setWebViewRenderProcessClient(WebViewRenderProcessClient)} and {@link
   * WebView#getWebViewRenderProcessClient()}.
   *
   * Instances may be attached to multiple WebViews, and thus a single renderer event may cause
   * a callback to be called multiple times with different WebView parameters.
   */
  public abstract class WebViewRenderProcessClient {
      /**
       * Called when the renderer currently associated with {@code view} becomes unresponsive as a
       * result of a long running blocking task such as the execution of JavaScript.
       *
       * <p>If a WebView fails to process an input event, or successfully navigate to a new URL within
       * a reasonable time frame, the renderer is considered to be unresponsive, and this callback
       * will be called.
       *
       * <p>This callback will continue to be called at regular intervals as long as the renderer
       * remains unresponsive. If the renderer becomes responsive again, {@link
       * WebViewRenderProcessClient#onRenderProcessResponsive} will be called once, and this method
       * will not subsequently be called unless another period of unresponsiveness is detected.
       *
       * <p>The minimum interval between successive calls to {@code onRenderProcessUnresponsive} is 5
       * seconds.
       *
       * <p>No action is taken by WebView as a result of this method call. Applications may
       * choose to terminate the associated renderer via the object that is passed to this callback,
       * if in multiprocess mode, however this must be accompanied by correctly handling
       * {@link WebViewClient#onRenderProcessGone} for this WebView, and all other WebViews associated
       * with the same renderer. Failure to do so will result in application termination.
       *
       * @param view The {@link WebView} for which unresponsiveness was detected.
       * @param renderer The {@link WebViewRenderProcess} that has become unresponsive,
       * or {@code null} if WebView is running in single process mode.
       */
      public abstract void onRenderProcessUnresponsive(
              @NonNull WebView view, @Nullable WebViewRenderProcess renderer);
  
      /**
       * Called once when an unresponsive renderer currently associated with {@code view} becomes
       * responsive.
       *
       * <p>After a WebView renderer becomes unresponsive, which is notified to the application by
       * {@link WebViewRenderProcessClient#onRenderProcessUnresponsive}, it is possible for the
       * blocking renderer task to complete, returning the renderer to a responsive state. In that
       * case, this method is called once to indicate responsiveness.
       *
       * <p>No action is taken by WebView as a result of this method call.
       *
       * @param view The {@link WebView} for which responsiveness was detected.
       *
       * @param renderer The {@link WebViewRenderProcess} that has become responsive, or {@code null}
       *                 if WebView is running in single process mode.
       */
      public abstract void onRenderProcessResponsive(
              @NonNull WebView view, @Nullable WebViewRenderProcess renderer);
  }
  