[Android] WorkManager - 병렬 Chaining

깨알 개념 📑/Android

[Android] WorkManager - 병렬 Chaining

interfacer_han 2024. 6. 17. 20:29

#1 이전 글

[Android] WorkManager - 작업 연쇄하기(Chaining)

#1 이전 글 [Android] WorkManager - 기초#1 이전 글 [Android] WorkManager - 개요#1 WorkManager는 '지연 가능한 백그라운드 작업'의 관리자 WorkManager를 사용한 백그라운드 작업 - Kotlin | Android DevelopersAndroid에는

kenel.tistory.com

위 게시글의 완성된 앱을 일부 수정해서, Worker의 Chaining을 병렬로 구성해본다.

#2 Parallel Chaining

이전 게시글의 Work Chaining의 심화판이다. 파란 네모끼리는 실행 순서가 보장되지만, 파란 네모 안의 Worker들끼리는 실행 순서가 보장되지 않는다. 즉, 파란 네모 안의 Worker들은 동시다발적으로 뒤죽박죽 실행된다 (#4의 로그 메시지 참조).

#3 코드 수정

#3-1 OtherWorker2.kt 생성

...

class OtherWorker2(context: Context, params: WorkerParameters) : Worker(context, params) {
    ...
}

UploadWorker.kt와 파일 이름 및 클래스 이름을 제외하고 모두 동일한 Worker 클래스를 만든다.

#3-2 AnotherWorker2.kt 생성

...

class AnotherWorker2(context: Context, params: WorkerParameters) : Worker(context, params) {
    ...
}

#3-1과 같은 과정으로 수정한다.

#3-3 AnotherWorker3.kt 생성

...

class AnotherWorker3(context: Context, params: WorkerParameters) : Worker(context, params) {
    ...
}

#3-1과 같은 과정으로 수정한다.

#3-4 MainActivity.kt

...

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        ...
    }

    private fun setOneTimeWorkRequest() {
        // WorkRequest 객체 만들기
        val uploadRequest = OneTimeWorkRequest
            .Builder(UploadWorker::class.java)
            .build()

        val otherWorker = OneTimeWorkRequest
            .Builder(OtherWorker::class.java)
            .build()

        val otherWorker2 = OneTimeWorkRequest
            .Builder(OtherWorker2::class.java)
            .build()

        val anotherWorker = OneTimeWorkRequest
            .Builder(AnotherWorker::class.java)
            .build()

        val anotherWorker2 = OneTimeWorkRequest
            .Builder(AnotherWorker2::class.java)
            .build()

        val anotherWorker3 = OneTimeWorkRequest
            .Builder(AnotherWorker3::class.java)
            .build()

        val parallelChain1 = mutableListOf<OneTimeWorkRequest>().apply {
            add(otherWorker)
            add(otherWorker2)
        }

        val parallelChain2 = mutableListOf<OneTimeWorkRequest>().apply {
            add(anotherWorker)
            add(anotherWorker2)
            add(anotherWorker3)
        }

        // WorkManager 객체의 작업 큐(Job queue)에 WorkRequest 등록
        workManager
            .beginWith(parallelChain1)
            .then(parallelChain2)
            .then(uploadRequest)
            .enqueue()

        // WorkInfo는 작업에 대한 정보를 담은 객체.
        // WorkManager.getWorkInfoByIdLiveData()는 LiveData<WorkInfo>를 반환.
        ...
    }

    private fun setPeriodicWorkRequest() {
        ...
    }
}

이전 게시글과의 차이는, WorkManager.beginWith() 자리 및 WorkManager.then() 자리에 OneTimeWorkRequest 대신 MutableList<OneTimeWorkRequest>가 들어간다는 점이다.

#3-5 ChainInitiationWorker

...

class ChainInitiationWorker(context: Context, params: WorkerParameters) : Worker(context, params) {
    override fun doWork(): Result {
        try {
            val workManager = ...

            // WorkRequest 객체 만들기
            val downloadRequest = OneTimeWorkRequest
                .Builder(DownloadWorker::class.java)
                .build()

            val otherWorker = OneTimeWorkRequest
                .Builder(OtherWorker::class.java)
                .build()

            val otherWorker2 = OneTimeWorkRequest
                .Builder(OtherWorker2::class.java)
                .build()

            val anotherWorker = OneTimeWorkRequest
                .Builder(AnotherWorker::class.java)
                .build()

            val anotherWorker2 = OneTimeWorkRequest
                .Builder(AnotherWorker2::class.java)
                .build()

            val anotherWorker3 = OneTimeWorkRequest
                .Builder(AnotherWorker3::class.java)
                .build()

            val parallelChain1 = mutableListOf<OneTimeWorkRequest>().apply {
                add(otherWorker)
                add(otherWorker2)
            }

            val parallelChain2 = mutableListOf<OneTimeWorkRequest>().apply {
                add(anotherWorker)
                add(anotherWorker2)
                add(anotherWorker3)
            }

            Log.i(...)

            workManager
                .beginWith(parallelChain1)
                .then(parallelChain2)
                .then(downloadRequest)
                .enqueue()

            Log.i(...)
            return Result.success()

        } catch (e: Exception) {
            return Result.failure()
        }
    }

    private fun getNowTime(): String {
        ...
    }
}

#3-4와 마찬가지로 이전 게시글과의 차이는, WorkManager.beginWith() 자리 및 WorkManager.then() 자리에 OneTimeWorkRequest 대신 MutableList<OneTimeWorkRequest>가 들어간다는 점이다.

#4 작동 확인

#4-1 'One Time Request' 버튼을 클릭했을 때의 로그 메시지

(MainActivity) UploadWorker's state: BLOCKED
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(AnotherWorker3) Started at 2024/06/17 10:28:08
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(AnotherWorker2) Finished at 2024/06/17 10:28:08
(MainActivity) UploadWorker's state: ENQUEUED
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(MainActivity) UploadWorker's state: RUNNING
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(UploadWorker) Finished at 2024/06/17 10:28:08
(MainActivity) UploadWorker's state: SUCCEEDED

UploadWorker의 상태가 BLOCKED인 것을 확인할 수 있다. BLOCKED는 B 작업의 선행 작업 A가 완료되지 않아서 순서 상 A에게 종속된(= 뒤에 있는) B의 실행이 유예된 상태를 의미한다 (이 게시글 참조).

#4-2 'Periodic Request' 버튼을 클릭했을 때의 로그 메시지

(MainActivity) ChainInitiationWorker's state: ENQUEUED
(ChainInitiationWorker) Started at 2024/06/17 10:33:59
(MainActivity) ChainInitiationWorker's state: RUNNING
(ChainInitiationWorker) Finished at 2024/06/17 10:33:59
(OtherWorker) Started at 2024/06/17 10:33:59
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(OtherWorker) Progress: 100/100
(OtherWorker) Finished at 2024/06/17 10:33:59
(MainActivity) ChainInitiationWorker's state: ENQUEUED
(OtherWorker2) Started at 2024/06/17 10:33:59
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(OtherWorker2) Progress: 100/100
(OtherWorker2) Finished at 2024/06/17 10:33:59
(AnotherWorker) Started at 2024/06/17 10:33:59
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(AnotherWorker2) Started at 2024/06/17 10:33:59
(AnotherWorker) Progress: 41/100
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(AnotherWorker2) Progress: 43/100
(AnotherWorker) Finished at 2024/06/17 10:33:59
(AnotherWorker2) Progress: 44/100
(AnotherWorker3) Started at 2024/06/17 10:33:59
(AnotherWorker3) Progress: 0/100
(AnotherWorker2) Progress: 45/100
(AnotherWorker3) Progress: 1/100
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(AnotherWorker3) Progress: 2/100
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(AnotherWorker2) Progress: 50/100
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(AnotherWorker3) Progress: 6/100
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(AnotherWorker3) Progress: 10/100
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(AnotherWorker3) Progress: 11/100
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(AnotherWorker3) Progress: 18/100
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(AnotherWorker3) Progress: 19/100
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(AnotherWorker3) Progress: 34/100
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(AnotherWorker3) Progress: 35/100
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(AnotherWorker3) Progress: 37/100
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(AnotherWorker2) Progress: 78/100
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(AnotherWorker3) Progress: 40/100
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(AnotherWorker2) Progress: 82/100
(AnotherWorker3) Progress: 41/100
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(AnotherWorker3) Progress: 43/100
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(AnotherWorker3) Progress: 44/100
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(AnotherWorker3) Progress: 49/100
(AnotherWorker2) Finished at 2024/06/17 10:33:59
(AnotherWorker3) Progress: 50/100
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(AnotherWorker3) Finished at 2024/06/17 10:34:00
(DownloadWorker) Started at 2024/06/17 10:34:00
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(DownloadWorker) Finished at 2024/06/17 10:34:00

이하 생략

ChainInitiationWorker가 RUNNING 상태 후 굉장히 빨리 ENQUEUED로 전환(위 코드에서 108번째 줄)되었는데, 이는 ChainInitiationWorker의 스레드와 다른 별도의 스레드에서 ChainInitiationWorker 내부의 WorkRequest가 진행되었기 때문으로 보인다.

#5 요약

Worker의 Chaining을 병렬로 구성함으로써, 코드의 유연성을 극대화한다.

#6 완성된 앱

android-practice/work-manager/ParallelChaining at master · Kanmanemone/android-practice

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현재글[Android] WorkManager - 병렬 Chaining

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Baekjoon

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workmanager, 오블완, Jetpack Compose, flow, Unit Testing, retrofit, Coroutines, Data Binding, Notifications, Navigation, ViewModel, 티스토리챌린지, livedata, dagger2, Room, hilt, recyclerview,

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