1 /* 2 * Copyright (C) 2021 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.systemui.util.concurrency 18 19 import android.os.Looper 20 import javax.inject.Inject 21 22 /** 23 * Methods to check or assert that we're on the main thread 24 */ 25 interface Execution { assertIsMainThreadnull26 fun assertIsMainThread() 27 fun isMainThread(): Boolean 28 } 29 30 class ExecutionImpl @Inject constructor() : Execution { 31 private val mainLooper = Looper.getMainLooper() 32 33 override fun assertIsMainThread() { 34 if (!mainLooper.isCurrentThread) { 35 throw IllegalStateException("should be called from the main thread." + 36 " Main thread name=" + mainLooper.thread.name + 37 " Thread.currentThread()=" + Thread.currentThread().name) 38 } 39 } 40 41 override fun isMainThread(): Boolean { 42 return mainLooper.isCurrentThread 43 } 44 } 45 46 class FakeExecution : Execution { 47 var simulateMainThread = true 48 assertIsMainThreadnull49 override fun assertIsMainThread() { 50 if (!simulateMainThread) { 51 throw IllegalStateException("should be called from the main thread") 52 } 53 } 54 isMainThreadnull55 override fun isMainThread(): Boolean { 56 return simulateMainThread 57 } 58 } 59