code: package io.virtualapp.home.repo;
  
  import com.lody.virtual.client.core.VirtualCore;
  import com.lody.virtual.remote.InstalledAppInfo;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import io.virtualapp.VApp;
  import io.virtualapp.abs.Callback;
  import io.virtualapp.abs.ui.VUiKit;
  import io.virtualapp.home.models.PackageAppData;
  
  /**
   * @author Lody
   *         <p>
   *         Cache the loaded PackageAppData.
   */
  public class PackageAppDataStorage {
  
      private static final PackageAppDataStorage STORAGE = new PackageAppDataStorage();
      private final Map<String, PackageAppData> packageDataMap = new HashMap<>();
  
      public static PackageAppDataStorage get() {
          return STORAGE;
      }
  
      public PackageAppData acquire(String packageName) {
          PackageAppData data;
          synchronized (packageDataMap) {
              data = packageDataMap.get(packageName);
              if (data == null) {
                  data = loadAppData(packageName);
              }
          }
          return data;
      }
  
      public void acquire(String packageName, Callback<PackageAppData> callback) {
          VUiKit.defer()
                  .when(() -> acquire(packageName))
                  .done(callback::callback);
      }
  
      private PackageAppData loadAppData(String packageName) {
          InstalledAppInfo setting = VirtualCore.get().getInstalledAppInfo(packageName, 0);
          if (setting != null) {
              PackageAppData data = new PackageAppData(VApp.getApp(), setting);
              synchronized (packageDataMap) {
                  packageDataMap.put(packageName, data);
              }
              return data;
          }
          return null;
      }
  
  }
  