1 /* 2 * Copyright (C) 2023 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 package com.android.server.bluetooth 17 18 import android.bluetooth.BluetoothAdapter 19 import android.bluetooth.BluetoothAdapter.STATE_OFF 20 import kotlin.time.Duration 21 import kotlin.time.toKotlinDuration 22 import kotlinx.coroutines.flow.MutableSharedFlow 23 import kotlinx.coroutines.flow.filter 24 import kotlinx.coroutines.flow.first 25 import kotlinx.coroutines.runBlocking 26 import kotlinx.coroutines.withTimeoutOrNull 27 28 /** Thread safe class that allow waiting on a specific state change */ 29 class BluetoothAdapterState { 30 // MutableStateFlow cannot be used because it is conflated (See official doc) 31 private val _uiState = MutableSharedFlow<Int>(1 /* replay only most recent value*/) 32 33 init { 34 set(STATE_OFF) 35 } 36 <lambda>null37 fun set(s: Int) = runBlocking { _uiState.emit(s) } 38 getnull39 fun get(): Int = _uiState.replayCache.get(0) 40 41 fun oneOf(vararg states: Int): Boolean = states.contains(get()) 42 43 override fun toString() = BluetoothAdapter.nameForState(get()) 44 45 fun waitForState(timeout: java.time.Duration, vararg states: Int) = runBlocking { 46 waitForState(timeout.toKotlinDuration(), *states) 47 } 48 waitForStatenull49 suspend fun waitForState(timeout: Duration, vararg states: Int): Boolean = 50 withTimeoutOrNull(timeout) { _uiState.filter { states.contains(it) }.first() } != null 51 } 52