| /* |
| * 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 android.net.util; |
| |
| import android.annotation.NonNull; |
| import android.content.Context; |
| import android.net.ConnectivityManager; |
| import android.net.NetworkCapabilities; |
| |
| /** |
| * Collection of utilities for socket keepalive offload. |
| * |
| * @hide |
| */ |
| public final class KeepaliveUtils { |
| |
| public static final String TAG = "KeepaliveUtils"; |
| |
| /** |
| * Read supported keepalive count for each transport type from overlay resource. This should be |
| * used to create a local variable store of resource customization, and use it as the input for |
| * {@link #getSupportedKeepalivesForNetworkCapabilities}. |
| * |
| * @param context The context to read resource from. |
| * @return An array of supported keepalive count for each transport type. |
| * @deprecated This is used by CTS 13, but can be removed after switching it to |
| * {@link ConnectivityManager#getSupportedKeepalives()}. |
| */ |
| @NonNull |
| @Deprecated |
| public static int[] getSupportedKeepalives(@NonNull Context context) { |
| return context.getSystemService(ConnectivityManager.class).getSupportedKeepalives(); |
| } |
| |
| /** |
| * Get supported keepalive count for the given {@link NetworkCapabilities}. |
| * |
| * @param supportedKeepalives An array of supported keepalive count for each transport type. |
| * @param nc The {@link NetworkCapabilities} of the network the socket keepalive is on. |
| * |
| * @return Supported keepalive count for the given {@link NetworkCapabilities}. |
| */ |
| public static int getSupportedKeepalivesForNetworkCapabilities( |
| @NonNull int[] supportedKeepalives, @NonNull NetworkCapabilities nc) { |
| final int[] transports = nc.getTransportTypes(); |
| if (transports.length == 0) return 0; |
| int supportedCount = supportedKeepalives[transports[0]]; |
| // Iterate through transports and return minimum supported value. |
| for (final int transport : transports) { |
| if (supportedCount > supportedKeepalives[transport]) { |
| supportedCount = supportedKeepalives[transport]; |
| } |
| } |
| return supportedCount; |
| } |
| } |