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Kotlin Coroutineを使ったタイムアウト付きのリトライ処理の方法

Last updated at Posted at 2022-09-15

KotlinCoroutineを使ったタイムアウト付きのリトライ処理の方法

APIリクエスト失敗時にタイムアウト付きでリトライする場合

main.kt

class ApiService() {

    //通信処理用スコープ
    private val ioScope by lazy { CoroutineScope(Job() + Dispatchers.IO) }

    suspend fun request(): Boolean {
        return try {

            //通信するため、IOスコープに切り替える
            withContext(ioScope.coroutineContext) {
                //Timeoutを設定
                //Timeout時はTimeoutCancellationExceptionが吐かれる
                withTimeout(10 * 1000) {

                    //リクエスト結果
                    var result = false

                    while(!result) {
                        //ここでリクエスト
                        result = RequestApi()
                        //1秒後にリトライ
                        delay(1000)
                    }

                    return@withTimeout result

                }

            }

        } catch(ex: Exception) {
            when(ex) {
                is TimeoutCancellationException -> {
                    //タイムアウト時
                }
                else-> {
                    //その他エラー
                }
            }
            false
        }        
    }
    
}

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