Kotlinのcoroutine、async/awaitと同じでしょ？って思ってたけど意外と洗練されててすごいなぁって思った話をさせてほしい

2019-10-25 VALU社内LT資料です

Transcript

1. ,PUMJOͷDPSPVUJOFɺBTZODBXBJUͱಉ ͡Ͱ͠ΐʁͬͯࢥ͚ͬͯͨͲҙ֎ͱચ࿅ ͞Ε͍ͯͯ͢͝ͳ͊ͬͯࢥͬͨ࿩Λͤ͞ ͯ΄͍͠ 5BLVZB
   ,JLVDIJ
2. ಺༰ w $Ͱ͓ͳ͡Έͷ
   BTZODBXBJU
   ʹ͋ͨΔ΋ͷ͕,PUMJOͰ΋ ࢖͑ΔΑ͏ʹͳͬͯخ͍͠ͳ
   w ,PUMJOͷDPSPVUJOF͸ɺจ๏͕ͪΐͬͱચ࿅͞Εͯͯૉఢ ͩͳͬͯࢥͬͨ
   w ʮؒҧ͍ʹ͍͘ʢFSSPSQSPOFͰ͸ͳ͍ʣʯจ๏ʹͯ͋͠ ΔɺͬͯυΩϡϝϯτʹ܁Γฦ͠ॻ͍ͯ͋Δɻ޷͖
3. BTZODBXBJU
   $ private static async Task<int> HeavyWork() { // ͳΜ͔͍͢͝ॏ͍ͨॲཧ await Task.Delay(1000); Console.WriteLine("done!"); return 0; } static void Main(string[] args) { Task.Run(async () => { await HeavyWork(); await HeavyWork(); await HeavyWork(); }).Wait(); } > done! done! done!
4. ,PUMJO
   DPSPVUJOF suspend fun heavyWork(): Int { /// ॏ͍ॲཧ sleep(1000) println("done!") return 0 } fun main() { GlobalScope.launch { heavyWork() heavyWork() heavyWork() } } > done! done! done!
5. ݟൺ΂ͯΈΔ private static async Task<int> HeavyWork() { // ͳΜ͔͍͢͝ॏ͍ͨॲཧ await Task.Delay(1000); Console.WriteLine("done!"); return 0; } static void Main(string[] args) { Task.Run(async () => { await HeavyWork(); await HeavyWork(); await HeavyWork(); }).Wait(); } suspend fun heavyWork(): Int { /// ॏ͍ॲཧ sleep(1000) println("done!") return 0 } fun main() { GlobalScope.launch { heavyWork() heavyWork() heavyWork() } }
6. ݟൺ΂ͯΈΔ private static async Task<int> HeavyWork() { // ͳΜ͔͍͢͝ॏ͍ͨॲཧ await Task.Delay(1000); Console.WriteLine("done!"); return 0; } static void Main(string[] args) { Task.Run(async () => { await HeavyWork(); await HeavyWork(); await HeavyWork(); }).Wait(); } suspend fun heavyWork(): Int { /// ॏ͍ॲཧ sleep(1000) println("done!") return 0 } fun main() { GlobalScope.launch { heavyWork() heavyWork() heavyWork() } }
7. ͬ͘͟Γͨ͠ϧʔϧ w BTZODBXBJU
   ʢ$ʣ
   w ඇಉظ࣮ߦ͍ͨؔ͠਺͸5BTL5Λฦ͢Α͏ʹ࣮૷͢Δ
   w BTZODؔ਺͸ඞͣ5BTL5ܕΛฦ͢
   w BTZOD
   ؔ਺಺ͰͷΈɺ5BTL5ΛBXBJUՄೳ
   w BXBJU͠ͳ͔ͬͨ৔߹͸ɺ'JSF'PSHFU
   w DPSPVUJOF
   LPUMJO
   w ඇಉظ࣮ߦ͍ͨؔ͠਺͸
   TVTQFOE
   GVODUJPOʢதஅؔ਺ʣͱͯ͠ఆٛ͢Δ
   w TVTQFOE
   GVODUJPOͷ໭Γ஋ͷܕʹറΓ͸ͳ͠
   w TVTQFOE
   GVODUJPO͸ɺTVTQFOE
   GVODUJPO಺෦ͰͷΈݺͼग़ͤΔ private static async Task<int> HeavyWork() { // ͳΜ͔͍͢͝ॏ͍ͨॲཧ await Task.Delay(1000); Console.WriteLine("done!"); return 0; } static void Main(string[] args) { Task.Run(async () => { await HeavyWork(); await HeavyWork(); await HeavyWork(); }).Wait(); } suspend fun heavyWork(): Int { /// ॏ͍ॲཧ sleep(1000) println("done!") return 0 } fun main() { GlobalScope.launch { heavyWork() heavyWork() heavyWork() } }
8. BTZODBXBJUͰ͋Γ͕ͪͳࣄނ w BXBJU͠๨Ε
   w BTZODؔ਺֎Ͱ΋ɺBXBJUͳ͠ͳΒݺ΂ͪΌ͏
   w ҙຯΛΑ͘ཧղͤͣʹίʔυॻ͍ͯͨΓ͢Δͱ΍Γ͕ͪ
   w େ఍ࣄނΔ static void Main(string[] args) { Task.Run(async () => { HeavyWork(); HeavyWork(); HeavyWork(); }).Wait(); } static void Main(string[] args) { HeavyWork(); HeavyWork(); HeavyWork(); }
9. ҰํLPUMJOͰ͸ w TVTQFOE
   GVODUJPOΛɺඇTVTQFOE
   GVODUJPO͔Β
 ݺͼग़ͦ͏ͱ͢ΔͱίϯύΠϧΤϥʔͩΑ
10. w $΋͍͍͚Ͳ,PUMJO΋Α͍
    w ޙൃ͸ڧ͍