1 /* 2 * Copyright 2022 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.server.bluetooth; 18 19 import android.provider.DeviceConfig; 20 import android.provider.DeviceConfig.Properties; 21 import android.util.Log; 22 23 import java.util.ArrayList; 24 import java.util.HashMap; 25 26 /** 27 * The BluetoothDeviceConfigChangeTracker receives changes to the DeviceConfig for 28 * NAMESPACE_BLUETOOTH, and determines whether we should queue a restart, if any Bluetooth-related 29 * INIT_ flags have been changed. 30 * 31 * <p>The initialProperties should be fetched from the BLUETOOTH namespace in DeviceConfig 32 */ 33 public final class BluetoothDeviceConfigChangeTracker { 34 private static final String TAG = "BluetoothDeviceConfigChangeTracker"; 35 36 private final HashMap<String, String> mCurrFlags; 37 BluetoothDeviceConfigChangeTracker(Properties initialProperties)38 public BluetoothDeviceConfigChangeTracker(Properties initialProperties) { 39 mCurrFlags = getFlags(initialProperties); 40 } 41 42 /** 43 * Updates the instance state tracking the latest init flag values, and determines whether an 44 * init flag has changed (requiring a restart at some point) 45 */ shouldRestartWhenPropertiesUpdated(Properties newProperties)46 public boolean shouldRestartWhenPropertiesUpdated(Properties newProperties) { 47 if (!newProperties.getNamespace().equals(DeviceConfig.NAMESPACE_BLUETOOTH)) { 48 return false; 49 } 50 ArrayList<String> flags = new ArrayList<>(); 51 for (String name : newProperties.getKeyset()) { 52 flags.add(name + "='" + newProperties.getString(name, "") + "'"); 53 } 54 Log.d(TAG, "shouldRestartWhenPropertiesUpdated: " + String.join(",", flags)); 55 boolean shouldRestart = false; 56 for (String name : newProperties.getKeyset()) { 57 if (!isInitFlag(name)) { 58 continue; 59 } 60 var oldValue = mCurrFlags.get(name); 61 var newValue = newProperties.getString(name, ""); 62 if (newValue.equals(oldValue)) { 63 continue; 64 } 65 Log.d(TAG, "Property " + name + " changed from " + oldValue + " -> " + newValue); 66 mCurrFlags.put(name, newValue); 67 shouldRestart = true; 68 } 69 return shouldRestart; 70 } 71 getFlags(Properties initialProperties)72 private HashMap<String, String> getFlags(Properties initialProperties) { 73 var out = new HashMap(); 74 for (var name : initialProperties.getKeyset()) { 75 if (isInitFlag(name)) { 76 out.put(name, initialProperties.getString(name, "")); 77 } 78 } 79 return out; 80 } 81 isInitFlag(String flagName)82 private Boolean isInitFlag(String flagName) { 83 return flagName.startsWith("INIT_"); 84 } 85 } 86