service/src/com/android/server/bluetooth/BluetoothDeviceConfigListener.java

/*
 * Copyright 2020 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 com.android.server.bluetooth;

import android.provider.DeviceConfig;
import android.util.Log;

/**
 * The BluetoothDeviceConfigListener handles system device config change callback and checks
 * whether we need to inform BluetoothManagerService on this change.
 *
 * The information of device config change would not be passed to the BluetoothManagerService
 * when Bluetooth is on and Bluetooth is in one of the following situations:
 *   1. Bluetooth A2DP is connected.
 *   2. Bluetooth Hearing Aid profile is connected.
 */
public class BluetoothDeviceConfigListener {
    private static final String TAG = "BluetoothDeviceConfigListener";

    private final BluetoothManagerService mService;
    private final boolean mLogDebug;
    private final BluetoothDeviceConfigChangeTracker mConfigChangeTracker;

    BluetoothDeviceConfigListener(BluetoothManagerService service, boolean logDebug) {
        mService = service;
        mLogDebug = logDebug;
        mConfigChangeTracker =
                new BluetoothDeviceConfigChangeTracker(
                        DeviceConfig.getProperties(DeviceConfig.NAMESPACE_BLUETOOTH));
        DeviceConfig.addOnPropertiesChangedListener(
                DeviceConfig.NAMESPACE_BLUETOOTH,
                (Runnable r) -> r.run(),
                mDeviceConfigChangedListener);
    }

    private final DeviceConfig.OnPropertiesChangedListener mDeviceConfigChangedListener =
            new DeviceConfig.OnPropertiesChangedListener() {
                @Override
                public void onPropertiesChanged(DeviceConfig.Properties newProperties) {
                    if (mConfigChangeTracker.shouldRestartWhenPropertiesUpdated(newProperties)) {
                        Log.d(TAG, "Properties changed, enqueuing restart");
                        mService.onInitFlagsChanged();
                    } else {
                        Log.d(TAG, "All properties unchanged, skipping restart");
                    }
                }
            };
}