| /* |
| * Copyright 2018 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 androidx.lifecycle |
| |
| import kotlinx.coroutines.CoroutineScope |
| import kotlinx.coroutines.Dispatchers |
| import kotlinx.coroutines.SupervisorJob |
| import kotlinx.coroutines.cancel |
| import java.io.Closeable |
| import kotlin.coroutines.CoroutineContext |
| |
| private const val JOB_KEY = "androidx.lifecycle.ViewModelCoroutineScope.JOB_KEY" |
| |
| /** |
| * [CoroutineScope] tied to this [ViewModel]. |
| * This scope will be canceled when ViewModel will be cleared, i.e [ViewModel.onCleared] is called |
| * |
| * This scope is bound to [Dispatchers.Main] |
| */ |
| val ViewModel.viewModelScope: CoroutineScope |
| get() { |
| val scope: CoroutineScope? = this.getTag(JOB_KEY) |
| if (scope != null) { |
| return scope |
| } |
| return setTagIfAbsent(JOB_KEY, |
| CloseableCoroutineScope(SupervisorJob() + Dispatchers.Main)) |
| } |
| |
| internal class CloseableCoroutineScope(context: CoroutineContext) : Closeable, CoroutineScope { |
| override val coroutineContext: CoroutineContext = context |
| |
| override fun close() { |
| coroutineContext.cancel() |
| } |
| } |