code: package com.lody.virtual.server.location;
  
  import android.os.Parcel;
  import android.os.Parcelable;
  import android.os.RemoteException;
  
  import com.lody.virtual.helper.PersistenceLayer;
  import com.lody.virtual.helper.collection.SparseArray;
  import com.lody.virtual.os.VEnvironment;
  import com.lody.virtual.remote.vloc.VCell;
  import com.lody.virtual.remote.vloc.VLocation;
  import com.lody.virtual.server.interfaces.IVirtualLocationManager;
  
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  /**
   * @author Lody
   */
  
  public class VirtualLocationService implements IVirtualLocationManager {
  
      private static final VirtualLocationService sInstance = new VirtualLocationService();
      private final SparseArray<Map<String, VLocConfig>> mLocConfigs = new SparseArray<>();
      private final VLocConfig mGlobalConfig = new VLocConfig();
  
      private static final int MODE_CLOSE = 0;
      private static final int MODE_USE_GLOBAL = 1;
      private static final int MODE_USE_SELF = 2;
  
      private static class VLocConfig implements Parcelable {
          int mode;
          VCell cell;
          List<VCell> allCell;
          List<VCell> neighboringCell;
          VLocation location;
  
          public void set(VLocConfig other) {
              this.mode = other.mode;
              this.cell = other.cell;
              this.allCell = other.allCell;
              this.neighboringCell = other.neighboringCell;
              this.location = other.location;
          }
  
          VLocConfig() {
          }
  
          @Override
          public int describeContents() {
              return 0;
          }
  
          @Override
          public void writeToParcel(Parcel dest, int flags) {
              dest.writeInt(this.mode);
              dest.writeParcelable(this.cell, flags);
              dest.writeTypedList(this.allCell);
              dest.writeTypedList(this.neighboringCell);
              dest.writeParcelable(this.location, flags);
          }
  
          VLocConfig(Parcel in) {
              this.mode = in.readInt();
              this.cell = in.readParcelable(VCell.class.getClassLoader());
              this.allCell = in.createTypedArrayList(VCell.CREATOR);
              this.neighboringCell = in.createTypedArrayList(VCell.CREATOR);
              this.location = in.readParcelable(VLocation.class.getClassLoader());
          }
  
          public static final Creator<VLocConfig> CREATOR = new Creator<VLocConfig>() {
              @Override
              public VLocConfig createFromParcel(Parcel source) {
                  return new VLocConfig(source);
              }
  
              @Override
              public VLocConfig[] newArray(int size) {
                  return new VLocConfig[size];
              }
          };
      }
  
      private final PersistenceLayer mPersistenceLayer = new PersistenceLayer(VEnvironment.getVirtualLocationFile()) {
          @Override
          public int getCurrentVersion() {
              return 1;
          }
  
          @Override
          public void writePersistenceData(Parcel p) {
              mGlobalConfig.writeToParcel(p, 0);
              p.writeInt(mLocConfigs.size());
              for (int i = 0; i < mLocConfigs.size(); i++) {
                  int userId = mLocConfigs.keyAt(i);
                  Map<String, VLocConfig> pkgs = mLocConfigs.valueAt(i);
                  p.writeInt(userId);
                  p.writeMap(pkgs);
              }
          }
  
          @Override
          public void readPersistenceData(Parcel p) {
              mGlobalConfig.set(new VLocConfig(p));
              mLocConfigs.clear();
              int size = p.readInt();
              while (size-- > 0) {
                  int userId = p.readInt();
                  //noinspection unchecked
                  Map<String, VLocConfig> pkgs = p.readHashMap(getClass().getClassLoader());
                  mLocConfigs.put(userId, pkgs);
              }
          }
      };
  
      public static VirtualLocationService get() {
          return sInstance;
      }
  
      private VirtualLocationService() {
          mPersistenceLayer.read();
      }
  
      @Override
      public int getMode(int userId, String pkg) {
          synchronized (mLocConfigs) {
              VLocConfig config = getOrCreateConfig(userId, pkg);
              mPersistenceLayer.save();
              return config.mode;
          }
      }
  
      @Override
      public void setMode(int userId, String pkg, int mode) {
          synchronized (mLocConfigs) {
              getOrCreateConfig(userId, pkg).mode = mode;
              mPersistenceLayer.save();
          }
      }
  
      private VLocConfig getOrCreateConfig(int userId, String pkg) {
          Map<String, VLocConfig> pkgs = mLocConfigs.get(userId);
          if (pkgs == null) {
              pkgs = new HashMap<>();
              mLocConfigs.put(userId, pkgs);
          }
          VLocConfig config = pkgs.get(pkg);
          if (config == null) {
              config = new VLocConfig();
              config.mode = MODE_CLOSE;
              pkgs.put(pkg, config);
          }
          return config;
      }
  
      @Override
      public void setCell(int userId, String pkg, VCell cell) {
          getOrCreateConfig(userId, pkg).cell = cell;
          mPersistenceLayer.save();
      }
  
      @Override
      public void setAllCell(int userId, String pkg, List<VCell> cell) {
          getOrCreateConfig(userId, pkg).allCell = cell;
          mPersistenceLayer.save();
      }
  
      @Override
      public void setNeighboringCell(int userId, String pkg, List<VCell> cell) {
          getOrCreateConfig(userId, pkg).neighboringCell = cell;
          mPersistenceLayer.save();
      }
  
      @Override
      public void setGlobalCell(VCell cell) {
          mGlobalConfig.cell = cell;
          mPersistenceLayer.save();
      }
  
      @Override
      public void setGlobalAllCell(List<VCell> cell) {
          mGlobalConfig.allCell = cell;
          mPersistenceLayer.save();
      }
  
      @Override
      public void setGlobalNeighboringCell(List<VCell> cell) {
          mGlobalConfig.neighboringCell = cell;
          mPersistenceLayer.save();
      }
  
      @Override
      public VCell getCell(int userId, String pkg) {
          VLocConfig config = getOrCreateConfig(userId, pkg);
          mPersistenceLayer.save();
          switch (config.mode) {
              case MODE_USE_SELF:
                  return config.cell;
              case MODE_USE_GLOBAL:
                  return mGlobalConfig.cell;
              case MODE_CLOSE:
              default:
                  return null;
          }
      }
  
      @Override
      public List<VCell> getAllCell(int userId, String pkg) {
          VLocConfig config = getOrCreateConfig(userId, pkg);
          mPersistenceLayer.save();
          switch (config.mode) {
              case MODE_USE_SELF:
                  return config.allCell;
              case MODE_USE_GLOBAL:
                  return mGlobalConfig.allCell;
              case MODE_CLOSE:
              default:
                  return null;
          }
      }
  
      @Override
      public List<VCell> getNeighboringCell(int userId, String pkg) {
          VLocConfig config = getOrCreateConfig(userId, pkg);
          mPersistenceLayer.save();
          switch (config.mode) {
              case MODE_USE_SELF:
                  return config.neighboringCell;
              case MODE_USE_GLOBAL:
                  return mGlobalConfig.neighboringCell;
              case MODE_CLOSE:
              default:
                  return null;
          }
      }
  
      @Override
      public void setLocation(int userId, String pkg, VLocation loc) {
          getOrCreateConfig(userId, pkg).location = loc;
          mPersistenceLayer.save();
      }
  
      @Override
      public VLocation getLocation(int userId, String pkg) {
          VLocConfig config = getOrCreateConfig(userId, pkg);
          mPersistenceLayer.save();
          switch (config.mode) {
              case MODE_USE_SELF:
                  return config.location;
              case MODE_USE_GLOBAL:
                  return mGlobalConfig.location;
              case MODE_CLOSE:
              default:
                  return null;
          }
      }
  
      @Override
      public void setGlobalLocation(VLocation loc) {
          mGlobalConfig.location = loc;
      }
  
      @Override
      public VLocation getGlobalLocation() {
          return mGlobalConfig.location;
      }
  
  }
  