1 /*
2  * Copyright 2022 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 androidx.camera.camera2.pipe.testing
18 
19 import android.os.Handler
20 import android.os.HandlerThread
21 import androidx.camera.camera2.pipe.core.Threads
22 import kotlinx.coroutines.CoroutineDispatcher
23 import kotlinx.coroutines.CoroutineName
24 import kotlinx.coroutines.CoroutineScope
25 import kotlinx.coroutines.asExecutor
26 import kotlinx.coroutines.test.StandardTestDispatcher
27 import kotlinx.coroutines.test.TestScope
28 
29 public object FakeThreads {
fromDispatchernull30     public fun fromDispatcher(
31         dispatcher: CoroutineDispatcher,
32         blockingDispatcher: CoroutineDispatcher? = null,
33     ): Threads {
34         val scope = CoroutineScope(dispatcher + CoroutineName("CXCP-TestScope"))
35         return create(scope, dispatcher, blockingDispatcher)
36     }
37 
fromTestScopenull38     public fun fromTestScope(
39         scope: TestScope,
40         blockingDispatcher: CoroutineDispatcher? = null,
41     ): Threads {
42         val dispatcher = StandardTestDispatcher(scope.testScheduler, "CXCP-TestScope")
43         return create(scope, dispatcher, blockingDispatcher)
44     }
45 
createnull46     private fun create(
47         scope: CoroutineScope,
48         dispatcher: CoroutineDispatcher,
49         blockingDispatcher: CoroutineDispatcher?,
50     ): Threads {
51         val executor = dispatcher.asExecutor()
52 
53         @Suppress("deprecation")
54         val fakeHandler = {
55             val handlerThread = HandlerThread("FakeHandlerThread").apply { start() }
56             Handler(handlerThread.looper)
57         }
58 
59         return Threads(
60             scope,
61             blockingExecutor = blockingDispatcher?.asExecutor() ?: executor,
62             blockingDispatcher = blockingDispatcher ?: dispatcher,
63             backgroundExecutor = executor,
64             backgroundDispatcher = dispatcher,
65             lightweightExecutor = executor,
66             lightweightDispatcher = dispatcher,
67             camera2Handler = fakeHandler,
68             camera2Executor = { executor }
69         )
70     }
71 }
72