1 /* 2 * Copyright (C) 2024 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.example.tracing.demo.experiments 17 18 import com.android.app.tracing.coroutines.createCoroutineTracingContext 19 import com.example.tracing.demo.FixedThreadA 20 import javax.inject.Inject 21 import javax.inject.Singleton 22 import kotlinx.coroutines.CoroutineDispatcher 23 import kotlinx.coroutines.CoroutineScope 24 import kotlinx.coroutines.coroutineScope 25 import kotlinx.coroutines.flow.SharingStarted 26 import kotlinx.coroutines.flow.shareIn 27 28 @Singleton 29 class LeakySharedFlow 30 @Inject 31 constructor(@FixedThreadA private var dispatcherA: CoroutineDispatcher) : Experiment { 32 33 override val description: String = "Create a shared flow that cannot be cancelled by the caller" 34 35 private val leakedScope = 36 CoroutineScope(dispatcherA + createCoroutineTracingContext("flow-scope")) 37 startnull38 override suspend fun start() { 39 // BAD - does not follow structured concurrency. This creates a new job each time it is 40 // called. There is no way to cancel the shared flow because the parent does not know about 41 // it 42 coldCounterFlow("leaky1").shareIn(leakedScope, SharingStarted.Eagerly, replay = 10) 43 44 // BAD - this also leaks 45 coroutineScope { 46 coldCounterFlow("leaky2").shareIn(leakedScope, SharingStarted.Eagerly, replay = 10) 47 } 48 } 49 } 50