content: /*
   * Copyright (C) 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 com.android.server.wm;
  
  import static android.hardware.display.DisplayManager.DeviceConfig.KEY_HIGH_REFRESH_RATE_BLACKLIST;
  
  import android.annotation.NonNull;
  import android.annotation.Nullable;
  import android.content.res.Resources;
  import android.provider.DeviceConfig;
  import android.util.ArraySet;
  
  import com.android.internal.R;
  import com.android.internal.annotations.VisibleForTesting;
  import com.android.internal.os.BackgroundThread;
  
  import java.io.PrintWriter;
  import java.util.concurrent.Executor;
  
  /**
   * A Blacklist for packages that should force the display out of high refresh rate.
   */
  class HighRefreshRateBlacklist {
  
      private final ArraySet<String> mBlacklistedPackages = new ArraySet<>();
      @NonNull
      private final String[] mDefaultBlacklist;
      private final Object mLock = new Object();
  
      static HighRefreshRateBlacklist create(@NonNull Resources r) {
          return new HighRefreshRateBlacklist(r, new DeviceConfigInterface() {
              @Override
              public @Nullable String getProperty(@NonNull String namespace, @NonNull String name) {
                  return DeviceConfig.getProperty(namespace, name);
              }
              public void addOnPropertyChangedListener(@NonNull String namespace,
                      @NonNull Executor executor,
                      @NonNull DeviceConfig.OnPropertyChangedListener listener) {
                  DeviceConfig.addOnPropertyChangedListener(namespace, executor, listener);
              }
          });
      }
  
      @VisibleForTesting
      HighRefreshRateBlacklist(Resources r, DeviceConfigInterface deviceConfig) {
          mDefaultBlacklist = r.getStringArray(R.array.config_highRefreshRateBlacklist);
          deviceConfig.addOnPropertyChangedListener(DeviceConfig.NAMESPACE_DISPLAY_MANAGER,
                  BackgroundThread.getExecutor(), new OnPropertyChangedListener());
          final String property = deviceConfig.getProperty(DeviceConfig.NAMESPACE_DISPLAY_MANAGER,
                  KEY_HIGH_REFRESH_RATE_BLACKLIST);
          updateBlacklist(property);
      }
  
      private void updateBlacklist(@Nullable String property) {
          synchronized (mLock) {
              mBlacklistedPackages.clear();
              if (property != null) {
                  String[] packages = property.split(",");
                  for (String pkg : packages) {
                      String pkgName = pkg.trim();
                      if (!pkgName.isEmpty()) {
                          mBlacklistedPackages.add(pkgName);
                      }
                  }
              } else {
                  // If there's no config, or the config has been deleted, fallback to the device's
                  // default blacklist
                  for (String pkg : mDefaultBlacklist) {
                      mBlacklistedPackages.add(pkg);
                  }
              }
          }
      }
  
      boolean isBlacklisted(String packageName) {
          synchronized (mLock) {
              return mBlacklistedPackages.contains(packageName);
          }
      }
      void dump(PrintWriter pw) {
          pw.println("High Refresh Rate Blacklist");
          pw.println("  Packages:");
          synchronized (mLock) {
              for (String pkg : mBlacklistedPackages) {
                  pw.println("    " + pkg);
              }
          }
      }
  
      interface DeviceConfigInterface {
          @Nullable String getProperty(@NonNull String namespace, @NonNull String name);
          void addOnPropertyChangedListener(@NonNull String namespace, @NonNull Executor executor,
                  @NonNull DeviceConfig.OnPropertyChangedListener listener);
      }
  
      private class OnPropertyChangedListener implements DeviceConfig.OnPropertyChangedListener {
          public void onPropertyChanged(@NonNull String namespace, @NonNull String name,
                  @Nullable String value) {
              if (KEY_HIGH_REFRESH_RATE_BLACKLIST.equals(name)) {
                  updateBlacklist(value);
              }
          }
      }
  }
  
  