telephony/java/android/telephony/data/QualifiedNetworksService.java - platform/frameworks/base - Git at Google

 /*
  * Copyright 2018 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.telephony.data;

 import android.annotation.CallbackExecutor;
 import android.annotation.FlaggedApi;
 import android.annotation.NonNull;
 import android.annotation.SystemApi;
 import android.app.Service;
 import android.content.Intent;
 import android.os.Handler;
 import android.os.HandlerThread;
 import android.os.IBinder;
 import android.os.Looper;
 import android.os.Message;
 import android.os.RemoteException;
 import android.telephony.AccessNetworkConstants;
 import android.telephony.AccessNetworkConstants.AccessNetworkType;
 import android.telephony.Annotation.ApnType;
 import android.telephony.Annotation.NetCapability;
 import android.telephony.PreciseDataConnectionState;
 import android.util.Log;
 import android.util.SparseArray;

 import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.telephony.IIntegerConsumer;
 import com.android.internal.telephony.flags.FeatureFlags;
 import com.android.internal.telephony.flags.FeatureFlagsImpl;
 import com.android.internal.telephony.flags.Flags;
 import com.android.internal.util.FunctionalUtils;
 import com.android.telephony.Rlog;

 import java.util.List;
 import java.util.Objects;
 import java.util.concurrent.Executor;
 import java.util.function.Consumer;

 /**
  * Base class of the qualified networks service, which is a vendor service providing up-to-date
  * qualified network information to the frameworks for data handover control. A qualified network
  * is defined as an access network that is ready for bringing up data connection for given APN
  * types.
  *
  * Services that extend QualifiedNetworksService must register the service in their AndroidManifest
  * to be detected by the framework. They must be protected by the permission
  * "android.permission.BIND_TELEPHONY_DATA_SERVICE". The qualified networks service definition in
  * the manifest must follow the following format:
  * ...
  * <service android:name=".xxxQualifiedNetworksService"
  * android:permission="android.permission.BIND_TELEPHONY_DATA_SERVICE" >
  * <intent-filter>
  * <action android:name="android.telephony.data.QualifiedNetworksService" />
  * </intent-filter>
  * </service>
  * @hide
  */
 @SystemApi
 public abstract class QualifiedNetworksService extends Service {
  private static final String TAG = QualifiedNetworksService.class.getSimpleName();

  public static final String QUALIFIED_NETWORKS_SERVICE_INTERFACE =
  "android.telephony.data.QualifiedNetworksService";

  private static final int QNS_CREATE_NETWORK_AVAILABILITY_PROVIDER = 1;
  private static final int QNS_REMOVE_NETWORK_AVAILABILITY_PROVIDER = 2;
  private static final int QNS_REMOVE_ALL_NETWORK_AVAILABILITY_PROVIDERS = 3;
  private static final int QNS_UPDATE_QUALIFIED_NETWORKS = 4;
  private static final int QNS_APN_THROTTLE_STATUS_CHANGED = 5;
  private static final int QNS_EMERGENCY_DATA_NETWORK_PREFERRED_TRANSPORT_CHANGED = 6;
  private static final int QNS_REQUEST_NETWORK_VALIDATION = 7;

  /** Feature flags */
  private static final FeatureFlags sFeatureFlag = new FeatureFlagsImpl();

  private final HandlerThread mHandlerThread;

  private final QualifiedNetworksServiceHandler mHandler;

  private final SparseArray<NetworkAvailabilityProvider> mProviders = new SparseArray<>();

  /** @hide */
  @VisibleForTesting
  public final IQualifiedNetworksServiceWrapper mBinder = new IQualifiedNetworksServiceWrapper();

  /**
  * The abstract class of the network availability provider implementation. The vendor qualified
  * network service must extend this class to report the available networks for data
  * connection setup. Note that each instance of network availability provider is associated with
  * one physical SIM slot.
  */
  public abstract class NetworkAvailabilityProvider implements AutoCloseable {
  private final int mSlotIndex;

  private IQualifiedNetworksServiceCallback mCallback;

  /**
  * Qualified networks for each APN type. Key is the {@link ApnType}, value is the array
  * of available networks.
  */
  private SparseArray<int[]> mQualifiedNetworkTypesList = new SparseArray<>();

  /**
  * Constructor
  * @param slotIndex SIM slot index the network availability provider associated with.
  */
  public NetworkAvailabilityProvider(int slotIndex) {
  mSlotIndex = slotIndex;
  }

  /**
  * @return SIM slot index the network availability provider associated with.
  */
  public final int getSlotIndex() {
  return mSlotIndex;
  }

  private void registerForQualifiedNetworkTypesChanged(
  IQualifiedNetworksServiceCallback callback) {
  mCallback = callback;

  // Force sending the qualified networks upon registered.
  if (mCallback != null) {
  for (int i = 0; i < mQualifiedNetworkTypesList.size(); i++) {
  try {
  mCallback.onQualifiedNetworkTypesChanged(
  mQualifiedNetworkTypesList.keyAt(i),
  mQualifiedNetworkTypesList.valueAt(i));
  } catch (RemoteException e) {
  loge("Failed to call onQualifiedNetworksChanged. " + e);
  }
  }
  }
  }

  /**
  * Update the suggested qualified networks list. Network availability provider must invoke
  * this method whenever the suggested qualified networks changes. If this method is never
  * invoked for certain APN types, then frameworks uses its own logic to determine the
  * transport to setup the data network.
  *
  * For example, QNS can suggest frameworks setting up IMS data network on IWLAN by
  * specifying {@link ApnSetting#TYPE_IMS} with a list containing
  * {@link AccessNetworkType#IWLAN}.
  *
  * If QNS considers multiple access networks qualified for certain APN type, it can
  * suggest frameworks by specifying the APN type with multiple access networks in the list,
  * for example {{@link AccessNetworkType#EUTRAN}, {@link AccessNetworkType#IWLAN}}.
  * Frameworks will then first attempt to setup data on LTE network, and If the device moves
  * from LTE to UMTS, then frameworks will perform handover the data network to the second
  * preferred access network if available.
  *
  * If the {@code qualifiedNetworkTypes} list is empty, it means QNS has no suggestion to the
  * frameworks, and for that APN type frameworks will route the corresponding network
  * requests to {@link AccessNetworkConstants#TRANSPORT_TYPE_WWAN}.
  *
  * @param apnTypes APN type(s) of the qualified networks. This must be a bitmask combination
  * of {@link ApnType}. The same qualified networks will be applicable to all APN types
  * specified here.
  * @param qualifiedNetworkTypes List of access network types which are qualified for data
  * connection setup for {@code apnTypes} in the preferred order. Empty list means QNS has no
  * suggestion to the frameworks, and for that APN type frameworks will route the
  * corresponding network requests to {@link AccessNetworkConstants#TRANSPORT_TYPE_WWAN}.
  *
  * If one of the element is invalid, for example, {@link AccessNetworkType#UNKNOWN}, then
  * this operation becomes a no-op.
  */
  public final void updateQualifiedNetworkTypes(
  @ApnType int apnTypes, @NonNull List<Integer> qualifiedNetworkTypes) {
  int[] qualifiedNetworkTypesArray =
  qualifiedNetworkTypes.stream().mapToInt(i->i).toArray();
  mHandler.obtainMessage(QNS_UPDATE_QUALIFIED_NETWORKS, mSlotIndex, apnTypes,
  qualifiedNetworkTypesArray).sendToTarget();
  }

  private void onUpdateQualifiedNetworkTypes(@ApnType int apnTypes,
  int[] qualifiedNetworkTypes) {
  mQualifiedNetworkTypesList.put(apnTypes, qualifiedNetworkTypes);
  if (mCallback != null) {
  try {
  mCallback.onQualifiedNetworkTypesChanged(apnTypes, qualifiedNetworkTypes);
  } catch (RemoteException e) {
  loge("Failed to call onQualifiedNetworksChanged. " + e);
  }
  }
  }

  /**
  * The framework calls this method when the throttle status of an APN changes.
  *
  * This method is meant to be overridden.
  *
  * @param statuses the statuses that have changed
  */
  public void reportThrottleStatusChanged(@NonNull List<ThrottleStatus> statuses) {
  Log.d(TAG, "reportThrottleStatusChanged: statuses size=" + statuses.size());
  }

  /**
  * The framework calls this method when the preferred transport type used to set up
  * emergency data network is changed.
  *
  * This method is meant to be overridden.
  *
  * @param transportType transport type changed to be preferred
  */
  public void reportEmergencyDataNetworkPreferredTransportChanged(
  @AccessNetworkConstants.TransportType int transportType) {
  Log.d(TAG, "reportEmergencyDataNetworkPreferredTransportChanged: "
  + AccessNetworkConstants.transportTypeToString(transportType));
  }

  /**
  * Request network validation to the connected data network for given a network capability.
  *
  * <p>This network validation can only be performed when a data network is in connected
  * state, and will not be triggered if the data network does not support network validation
  * feature or network validation is not in connected state.
  *
  * <p>See {@link DataServiceCallback.ResultCode} for the type of response that indicates
  * whether the request was successfully submitted or had an error.
  *
  * <p>If network validation is requested, monitor network validation status in {@link
  * PreciseDataConnectionState#getNetworkValidationStatus()}.
  *
  * @param networkCapability A network capability. (Note that only APN-type capabilities are
  * supported.
  * @param executor executor The callback executor that responds whether the request has been
  * successfully submitted or not.
  * @param resultCodeCallback A callback to determine whether the request was successfully
  * submitted or not.
  */
  @FlaggedApi(Flags.FLAG_NETWORK_VALIDATION)
  public void requestNetworkValidation(
  @NetCapability int networkCapability,
  @NonNull @CallbackExecutor Executor executor,
  @NonNull @DataServiceCallback.ResultCode Consumer<Integer> resultCodeCallback) {
  Objects.requireNonNull(executor, "executor cannot be null");
  Objects.requireNonNull(resultCodeCallback, "resultCodeCallback cannot be null");

  if (!sFeatureFlag.networkValidation()) {
  loge("networkValidation feature is disabled");
  executor.execute(
  () ->
  resultCodeCallback.accept(
  DataServiceCallback.RESULT_ERROR_UNSUPPORTED));
  return;
  }

  IIntegerConsumer callback = new IIntegerConsumer.Stub() {
  @Override
  public void accept(int result) {
  executor.execute(() -> resultCodeCallback.accept(result));
  }
  };

  // Move to the internal handler and process it.
  mHandler.obtainMessage(
  QNS_REQUEST_NETWORK_VALIDATION,
  mSlotIndex,
  0,
  new NetworkValidationRequestData(networkCapability, callback))
  .sendToTarget();
  }

  /** Process a network validation request on the internal handler. */
  private void onRequestNetworkValidation(NetworkValidationRequestData data) {
  try {
  log("onRequestNetworkValidation");
  // Callback to request a network validation.
  mCallback.onNetworkValidationRequested(data.mNetworkCapability, data.mCallback);
  } catch (RemoteException | NullPointerException e) {
  loge("Failed to call onRequestNetworkValidation. " + e);
  FunctionalUtils.ignoreRemoteException(data.mCallback::accept)
  .accept(DataServiceCallback.RESULT_ERROR_UNSUPPORTED);
  }
  }

  /**
  * Called when the qualified networks provider is removed. The extended class should
  * implement this method to perform cleanup works.
  */
  @Override
  public abstract void close();
  }

  private class QualifiedNetworksServiceHandler extends Handler {
  QualifiedNetworksServiceHandler(Looper looper) {
  super(looper);
  }

  @Override
  public void handleMessage(Message message) {
  IQualifiedNetworksServiceCallback callback;
  final int slotIndex = message.arg1;
  NetworkAvailabilityProvider provider = mProviders.get(slotIndex);

  switch (message.what) {
  case QNS_CREATE_NETWORK_AVAILABILITY_PROVIDER:
  if (mProviders.get(slotIndex) != null) {
  loge("Network availability provider for slot " + slotIndex
  + " already existed.");
  return;
  }

  provider = onCreateNetworkAvailabilityProvider(slotIndex);
  if (provider != null) {
  mProviders.put(slotIndex, provider);

  callback = (IQualifiedNetworksServiceCallback) message.obj;
  provider.registerForQualifiedNetworkTypesChanged(callback);
  } else {
  loge("Failed to create network availability provider. slot index = "
  + slotIndex);
  }
  break;
  case QNS_APN_THROTTLE_STATUS_CHANGED:
  if (provider != null) {
  List<ThrottleStatus> statuses = (List<ThrottleStatus>) message.obj;
  provider.reportThrottleStatusChanged(statuses);
  }
  break;

  case QNS_EMERGENCY_DATA_NETWORK_PREFERRED_TRANSPORT_CHANGED:
  if (provider != null) {
  int transportType = (int) message.arg2;
  provider.reportEmergencyDataNetworkPreferredTransportChanged(transportType);
  }
  break;

  case QNS_REMOVE_NETWORK_AVAILABILITY_PROVIDER:
  if (provider != null) {
  provider.close();
  mProviders.remove(slotIndex);
  }
  break;

  case QNS_REMOVE_ALL_NETWORK_AVAILABILITY_PROVIDERS:
  for (int i = 0; i < mProviders.size(); i++) {
  provider = mProviders.get(i);
  if (provider != null) {
  provider.close();
  }
  }
  mProviders.clear();
  break;

  case QNS_UPDATE_QUALIFIED_NETWORKS:
  if (provider == null) break;
  provider.onUpdateQualifiedNetworkTypes(message.arg2, (int[]) message.obj);
  break;

  case QNS_REQUEST_NETWORK_VALIDATION:
  if (provider == null) break;
  provider.onRequestNetworkValidation((NetworkValidationRequestData) message.obj);
  }
  }
  }

  /**
  * Default constructor.
  */
  public QualifiedNetworksService() {
  mHandlerThread = new HandlerThread(TAG);
  mHandlerThread.start();

  mHandler = new QualifiedNetworksServiceHandler(mHandlerThread.getLooper());
  log("Qualified networks service created");
  }

  /**
  * Create the instance of {@link NetworkAvailabilityProvider}. Vendor qualified network service
  * must override this method to facilitate the creation of {@link NetworkAvailabilityProvider}
  * instances. The system will call this method after binding the qualified networks service for
  * each active SIM slot index.
  *
  * @param slotIndex SIM slot index the qualified networks service associated with.
  * @return Qualified networks service instance
  */
  @NonNull
  public abstract NetworkAvailabilityProvider onCreateNetworkAvailabilityProvider(int slotIndex);

  /** @hide */
  @Override
  public IBinder onBind(Intent intent) {
  if (intent == null || !QUALIFIED_NETWORKS_SERVICE_INTERFACE.equals(intent.getAction())) {
  loge("Unexpected intent " + intent);
  return null;
  }
  return mBinder;
  }

  /** @hide */
  @Override
  public boolean onUnbind(Intent intent) {
  mHandler.obtainMessage(QNS_REMOVE_ALL_NETWORK_AVAILABILITY_PROVIDERS).sendToTarget();
  return false;
  }

  /** @hide */
  @Override
  public void onDestroy() {
  mHandlerThread.quit();
  }

  /**
  * A wrapper around IQualifiedNetworksService that forwards calls to implementations of
  * {@link QualifiedNetworksService}.
  */
  private class IQualifiedNetworksServiceWrapper extends IQualifiedNetworksService.Stub {
  @Override
  public void createNetworkAvailabilityProvider(int slotIndex,
  IQualifiedNetworksServiceCallback callback) {
  mHandler.obtainMessage(QNS_CREATE_NETWORK_AVAILABILITY_PROVIDER, slotIndex, 0,
  callback).sendToTarget();
  }

  @Override
  public void removeNetworkAvailabilityProvider(int slotIndex) {
  mHandler.obtainMessage(QNS_REMOVE_NETWORK_AVAILABILITY_PROVIDER, slotIndex, 0)
  .sendToTarget();
  }

  @Override
  public void reportThrottleStatusChanged(int slotIndex,
  List<ThrottleStatus> statuses) {
  mHandler.obtainMessage(QNS_APN_THROTTLE_STATUS_CHANGED, slotIndex, 0, statuses)
  .sendToTarget();
  }

  @Override
  public void reportEmergencyDataNetworkPreferredTransportChanged(int slotIndex,
  @AccessNetworkConstants.TransportType int transportType) {
  mHandler.obtainMessage(
  QNS_EMERGENCY_DATA_NETWORK_PREFERRED_TRANSPORT_CHANGED,
  slotIndex, transportType).sendToTarget();
  }
  }

  private static final class NetworkValidationRequestData {
  final @NetCapability int mNetworkCapability;
  final IIntegerConsumer mCallback;

  private NetworkValidationRequestData(@NetCapability int networkCapability,
  @NonNull IIntegerConsumer callback) {
  mNetworkCapability = networkCapability;
  mCallback = callback;
  }
  }

  private void log(String s) {
  Rlog.d(TAG, s);
  }

  private void loge(String s) {
  Rlog.e(TAG, s);
  }
 }
	/*
	* Copyright 2018 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.telephony.data;

	import android.annotation.CallbackExecutor;
	import android.annotation.FlaggedApi;
	import android.annotation.NonNull;
	import android.annotation.SystemApi;
	import android.app.Service;
	import android.content.Intent;
	import android.os.Handler;
	import android.os.HandlerThread;
	import android.os.IBinder;
	import android.os.Looper;
	import android.os.Message;
	import android.os.RemoteException;
	import android.telephony.AccessNetworkConstants;
	import android.telephony.AccessNetworkConstants.AccessNetworkType;
	import android.telephony.Annotation.ApnType;
	import android.telephony.Annotation.NetCapability;
	import android.telephony.PreciseDataConnectionState;
	import android.util.Log;
	import android.util.SparseArray;

	import com.android.internal.annotations.VisibleForTesting;
	import com.android.internal.telephony.IIntegerConsumer;
	import com.android.internal.telephony.flags.FeatureFlags;
	import com.android.internal.telephony.flags.FeatureFlagsImpl;
	import com.android.internal.telephony.flags.Flags;
	import com.android.internal.util.FunctionalUtils;
	import com.android.telephony.Rlog;

	import java.util.List;
	import java.util.Objects;
	import java.util.concurrent.Executor;
	import java.util.function.Consumer;

	/**
	* Base class of the qualified networks service, which is a vendor service providing up-to-date
	* qualified network information to the frameworks for data handover control. A qualified network
	* is defined as an access network that is ready for bringing up data connection for given APN
	* types.
	*
	* Services that extend QualifiedNetworksService must register the service in their AndroidManifest
	* to be detected by the framework. They must be protected by the permission
	* "android.permission.BIND_TELEPHONY_DATA_SERVICE". The qualified networks service definition in
	* the manifest must follow the following format:
	* ...
	* <service android:name=".xxxQualifiedNetworksService"
	* android:permission="android.permission.BIND_TELEPHONY_DATA_SERVICE" >
	* <intent-filter>
	* <action android:name="android.telephony.data.QualifiedNetworksService" />
	* </intent-filter>
	* </service>
	* @hide
	*/
	@SystemApi
	public abstract class QualifiedNetworksService extends Service {
	private static final String TAG = QualifiedNetworksService.class.getSimpleName();

	public static final String QUALIFIED_NETWORKS_SERVICE_INTERFACE =
	"android.telephony.data.QualifiedNetworksService";

	private static final int QNS_CREATE_NETWORK_AVAILABILITY_PROVIDER = 1;
	private static final int QNS_REMOVE_NETWORK_AVAILABILITY_PROVIDER = 2;
	private static final int QNS_REMOVE_ALL_NETWORK_AVAILABILITY_PROVIDERS = 3;
	private static final int QNS_UPDATE_QUALIFIED_NETWORKS = 4;
	private static final int QNS_APN_THROTTLE_STATUS_CHANGED = 5;
	private static final int QNS_EMERGENCY_DATA_NETWORK_PREFERRED_TRANSPORT_CHANGED = 6;
	private static final int QNS_REQUEST_NETWORK_VALIDATION = 7;

	/** Feature flags */
	private static final FeatureFlags sFeatureFlag = new FeatureFlagsImpl();

	private final HandlerThread mHandlerThread;

	private final QualifiedNetworksServiceHandler mHandler;

	private final SparseArray<NetworkAvailabilityProvider> mProviders = new SparseArray<>();

	/** @hide */
	@VisibleForTesting
	public final IQualifiedNetworksServiceWrapper mBinder = new IQualifiedNetworksServiceWrapper();

	/**
	* The abstract class of the network availability provider implementation. The vendor qualified
	* network service must extend this class to report the available networks for data
	* connection setup. Note that each instance of network availability provider is associated with
	* one physical SIM slot.
	*/
	public abstract class NetworkAvailabilityProvider implements AutoCloseable {
	private final int mSlotIndex;

	private IQualifiedNetworksServiceCallback mCallback;

	/**
	* Qualified networks for each APN type. Key is the {@link ApnType}, value is the array
	* of available networks.
	*/
	private SparseArray<int[]> mQualifiedNetworkTypesList = new SparseArray<>();

	/**
	* Constructor
	* @param slotIndex SIM slot index the network availability provider associated with.
	*/
	public NetworkAvailabilityProvider(int slotIndex) {
	mSlotIndex = slotIndex;
	}

	/**
	* @return SIM slot index the network availability provider associated with.
	*/
	public final int getSlotIndex() {
	return mSlotIndex;
	}

	private void registerForQualifiedNetworkTypesChanged(
	IQualifiedNetworksServiceCallback callback) {
	mCallback = callback;

	// Force sending the qualified networks upon registered.
	if (mCallback != null) {
	for (int i = 0; i < mQualifiedNetworkTypesList.size(); i++) {
	try {
	mCallback.onQualifiedNetworkTypesChanged(
	mQualifiedNetworkTypesList.keyAt(i),
	mQualifiedNetworkTypesList.valueAt(i));
	} catch (RemoteException e) {
	loge("Failed to call onQualifiedNetworksChanged. " + e);
	}
	}
	}
	}

	/**
	* Update the suggested qualified networks list. Network availability provider must invoke
	* this method whenever the suggested qualified networks changes. If this method is never
	* invoked for certain APN types, then frameworks uses its own logic to determine the
	* transport to setup the data network.
	*
	* For example, QNS can suggest frameworks setting up IMS data network on IWLAN by
	* specifying {@link ApnSetting#TYPE_IMS} with a list containing
	* {@link AccessNetworkType#IWLAN}.
	*
	* If QNS considers multiple access networks qualified for certain APN type, it can
	* suggest frameworks by specifying the APN type with multiple access networks in the list,
	* for example {{@link AccessNetworkType#EUTRAN}, {@link AccessNetworkType#IWLAN}}.
	* Frameworks will then first attempt to setup data on LTE network, and If the device moves
	* from LTE to UMTS, then frameworks will perform handover the data network to the second
	* preferred access network if available.
	*
	* If the {@code qualifiedNetworkTypes} list is empty, it means QNS has no suggestion to the
	* frameworks, and for that APN type frameworks will route the corresponding network
	* requests to {@link AccessNetworkConstants#TRANSPORT_TYPE_WWAN}.
	*
	* @param apnTypes APN type(s) of the qualified networks. This must be a bitmask combination
	* of {@link ApnType}. The same qualified networks will be applicable to all APN types
	* specified here.
	* @param qualifiedNetworkTypes List of access network types which are qualified for data
	* connection setup for {@code apnTypes} in the preferred order. Empty list means QNS has no
	* suggestion to the frameworks, and for that APN type frameworks will route the
	* corresponding network requests to {@link AccessNetworkConstants#TRANSPORT_TYPE_WWAN}.
	*
	* If one of the element is invalid, for example, {@link AccessNetworkType#UNKNOWN}, then
	* this operation becomes a no-op.
	*/
	public final void updateQualifiedNetworkTypes(
	@ApnType int apnTypes, @NonNull List<Integer> qualifiedNetworkTypes) {
	int[] qualifiedNetworkTypesArray =
	qualifiedNetworkTypes.stream().mapToInt(i->i).toArray();
	mHandler.obtainMessage(QNS_UPDATE_QUALIFIED_NETWORKS, mSlotIndex, apnTypes,
	qualifiedNetworkTypesArray).sendToTarget();
	}

	private void onUpdateQualifiedNetworkTypes(@ApnType int apnTypes,
	int[] qualifiedNetworkTypes) {
	mQualifiedNetworkTypesList.put(apnTypes, qualifiedNetworkTypes);
	if (mCallback != null) {
	try {
	mCallback.onQualifiedNetworkTypesChanged(apnTypes, qualifiedNetworkTypes);
	} catch (RemoteException e) {
	loge("Failed to call onQualifiedNetworksChanged. " + e);
	}
	}
	}

	/**
	* The framework calls this method when the throttle status of an APN changes.
	*
	* This method is meant to be overridden.
	*
	* @param statuses the statuses that have changed
	*/
	public void reportThrottleStatusChanged(@NonNull List<ThrottleStatus> statuses) {
	Log.d(TAG, "reportThrottleStatusChanged: statuses size=" + statuses.size());
	}

	/**
	* The framework calls this method when the preferred transport type used to set up
	* emergency data network is changed.
	*
	* This method is meant to be overridden.
	*
	* @param transportType transport type changed to be preferred
	*/
	public void reportEmergencyDataNetworkPreferredTransportChanged(
	@AccessNetworkConstants.TransportType int transportType) {
	Log.d(TAG, "reportEmergencyDataNetworkPreferredTransportChanged: "
	+ AccessNetworkConstants.transportTypeToString(transportType));
	}

	/**
	* Request network validation to the connected data network for given a network capability.
	*
	* <p>This network validation can only be performed when a data network is in connected
	* state, and will not be triggered if the data network does not support network validation
	* feature or network validation is not in connected state.
	*
	* <p>See {@link DataServiceCallback.ResultCode} for the type of response that indicates
	* whether the request was successfully submitted or had an error.
	*
	* <p>If network validation is requested, monitor network validation status in {@link
	* PreciseDataConnectionState#getNetworkValidationStatus()}.
	*
	* @param networkCapability A network capability. (Note that only APN-type capabilities are
	* supported.
	* @param executor executor The callback executor that responds whether the request has been
	* successfully submitted or not.
	* @param resultCodeCallback A callback to determine whether the request was successfully
	* submitted or not.
	*/
	@FlaggedApi(Flags.FLAG_NETWORK_VALIDATION)
	public void requestNetworkValidation(
	@NetCapability int networkCapability,
	@NonNull @CallbackExecutor Executor executor,
	@NonNull @DataServiceCallback.ResultCode Consumer<Integer> resultCodeCallback) {
	Objects.requireNonNull(executor, "executor cannot be null");
	Objects.requireNonNull(resultCodeCallback, "resultCodeCallback cannot be null");

	if (!sFeatureFlag.networkValidation()) {
	loge("networkValidation feature is disabled");
	executor.execute(
	() ->
	resultCodeCallback.accept(
	DataServiceCallback.RESULT_ERROR_UNSUPPORTED));
	return;
	}

	IIntegerConsumer callback = new IIntegerConsumer.Stub() {
	@Override
	public void accept(int result) {
	executor.execute(() -> resultCodeCallback.accept(result));
	}
	};

	// Move to the internal handler and process it.
	mHandler.obtainMessage(
	QNS_REQUEST_NETWORK_VALIDATION,
	mSlotIndex,
	0,
	new NetworkValidationRequestData(networkCapability, callback))
	.sendToTarget();
	}

	/** Process a network validation request on the internal handler. */
	private void onRequestNetworkValidation(NetworkValidationRequestData data) {
	try {
	log("onRequestNetworkValidation");
	// Callback to request a network validation.
	mCallback.onNetworkValidationRequested(data.mNetworkCapability, data.mCallback);
	} catch (RemoteException \| NullPointerException e) {
	loge("Failed to call onRequestNetworkValidation. " + e);
	FunctionalUtils.ignoreRemoteException(data.mCallback::accept)
	.accept(DataServiceCallback.RESULT_ERROR_UNSUPPORTED);
	}
	}

	/**
	* Called when the qualified networks provider is removed. The extended class should
	* implement this method to perform cleanup works.
	*/
	@Override
	public abstract void close();
	}

	private class QualifiedNetworksServiceHandler extends Handler {
	QualifiedNetworksServiceHandler(Looper looper) {
	super(looper);
	}

	@Override
	public void handleMessage(Message message) {
	IQualifiedNetworksServiceCallback callback;
	final int slotIndex = message.arg1;
	NetworkAvailabilityProvider provider = mProviders.get(slotIndex);

	switch (message.what) {
	case QNS_CREATE_NETWORK_AVAILABILITY_PROVIDER:
	if (mProviders.get(slotIndex) != null) {
	loge("Network availability provider for slot " + slotIndex
	+ " already existed.");
	return;
	}

	provider = onCreateNetworkAvailabilityProvider(slotIndex);
	if (provider != null) {
	mProviders.put(slotIndex, provider);

	callback = (IQualifiedNetworksServiceCallback) message.obj;
	provider.registerForQualifiedNetworkTypesChanged(callback);
	} else {
	loge("Failed to create network availability provider. slot index = "
	+ slotIndex);
	}
	break;
	case QNS_APN_THROTTLE_STATUS_CHANGED:
	if (provider != null) {
	List<ThrottleStatus> statuses = (List<ThrottleStatus>) message.obj;
	provider.reportThrottleStatusChanged(statuses);
	}
	break;

	case QNS_EMERGENCY_DATA_NETWORK_PREFERRED_TRANSPORT_CHANGED:
	if (provider != null) {
	int transportType = (int) message.arg2;
	provider.reportEmergencyDataNetworkPreferredTransportChanged(transportType);
	}
	break;

	case QNS_REMOVE_NETWORK_AVAILABILITY_PROVIDER:
	if (provider != null) {
	provider.close();
	mProviders.remove(slotIndex);
	}
	break;

	case QNS_REMOVE_ALL_NETWORK_AVAILABILITY_PROVIDERS:
	for (int i = 0; i < mProviders.size(); i++) {
	provider = mProviders.get(i);
	if (provider != null) {
	provider.close();
	}
	}
	mProviders.clear();
	break;

	case QNS_UPDATE_QUALIFIED_NETWORKS:
	if (provider == null) break;
	provider.onUpdateQualifiedNetworkTypes(message.arg2, (int[]) message.obj);
	break;

	case QNS_REQUEST_NETWORK_VALIDATION:
	if (provider == null) break;
	provider.onRequestNetworkValidation((NetworkValidationRequestData) message.obj);
	}
	}
	}

	/**
	* Default constructor.
	*/
	public QualifiedNetworksService() {
	mHandlerThread = new HandlerThread(TAG);
	mHandlerThread.start();

	mHandler = new QualifiedNetworksServiceHandler(mHandlerThread.getLooper());
	log("Qualified networks service created");
	}

	/**
	* Create the instance of {@link NetworkAvailabilityProvider}. Vendor qualified network service
	* must override this method to facilitate the creation of {@link NetworkAvailabilityProvider}
	* instances. The system will call this method after binding the qualified networks service for
	* each active SIM slot index.
	*
	* @param slotIndex SIM slot index the qualified networks service associated with.
	* @return Qualified networks service instance
	*/
	@NonNull
	public abstract NetworkAvailabilityProvider onCreateNetworkAvailabilityProvider(int slotIndex);

	/** @hide */
	@Override
	public IBinder onBind(Intent intent) {
	if (intent == null \|\| !QUALIFIED_NETWORKS_SERVICE_INTERFACE.equals(intent.getAction())) {
	loge("Unexpected intent " + intent);
	return null;
	}
	return mBinder;
	}

	/** @hide */
	@Override
	public boolean onUnbind(Intent intent) {
	mHandler.obtainMessage(QNS_REMOVE_ALL_NETWORK_AVAILABILITY_PROVIDERS).sendToTarget();
	return false;
	}

	/** @hide */
	@Override
	public void onDestroy() {
	mHandlerThread.quit();
	}

	/**
	* A wrapper around IQualifiedNetworksService that forwards calls to implementations of
	* {@link QualifiedNetworksService}.
	*/
	private class IQualifiedNetworksServiceWrapper extends IQualifiedNetworksService.Stub {
	@Override
	public void createNetworkAvailabilityProvider(int slotIndex,
	IQualifiedNetworksServiceCallback callback) {
	mHandler.obtainMessage(QNS_CREATE_NETWORK_AVAILABILITY_PROVIDER, slotIndex, 0,
	callback).sendToTarget();
	}

	@Override
	public void removeNetworkAvailabilityProvider(int slotIndex) {
	mHandler.obtainMessage(QNS_REMOVE_NETWORK_AVAILABILITY_PROVIDER, slotIndex, 0)
	.sendToTarget();
	}

	@Override
	public void reportThrottleStatusChanged(int slotIndex,
	List<ThrottleStatus> statuses) {
	mHandler.obtainMessage(QNS_APN_THROTTLE_STATUS_CHANGED, slotIndex, 0, statuses)
	.sendToTarget();
	}

	@Override
	public void reportEmergencyDataNetworkPreferredTransportChanged(int slotIndex,
	@AccessNetworkConstants.TransportType int transportType) {
	mHandler.obtainMessage(
	QNS_EMERGENCY_DATA_NETWORK_PREFERRED_TRANSPORT_CHANGED,
	slotIndex, transportType).sendToTarget();
	}
	}

	private static final class NetworkValidationRequestData {
	final @NetCapability int mNetworkCapability;
	final IIntegerConsumer mCallback;

	private NetworkValidationRequestData(@NetCapability int networkCapability,
	@NonNull IIntegerConsumer callback) {
	mNetworkCapability = networkCapability;
	mCallback = callback;
	}
	}

	private void log(String s) {
	Rlog.d(TAG, s);
	}

	private void loge(String s) {
	Rlog.e(TAG, s);
	}
	}