droidkaigi-2017

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1. Error Handling in RxJava DroidKaigi 2017 yuyakaido

2. ࣗݾ঺հ • ւ౻༏໻ʢ͔͍Ͳ͏Ώ͏΍ʣ • AndroidΤϯδχΞ yuyakaido

3. ձࣾ঺հ • גࣜձࣾΤ΢ϨΧ • ࣗࣾΞϓϦͷاըɾ։ൃɾӡӦ • ΦϯϥΠϯσʔςΟϯά • Χοϓϧίϛϡχέʔγϣϯ

4. ຊηογϣϯͰ͓఻͍͑ͨ͜͠ͱ

5. ຊηογϣϯͰ͓఻͍͑ͨ͜͠ͱ • RxJavaͬͯOperator͕ଟͯ͘೉ͦ͠͏ • ΤϥʔϋϯυϦϯά༻ͷOperator͸ଟ͋͘Γ·ͤΜ • Ϣʔεέʔε͔Βߟ͑ͯΈΔͱ͍͍͔΋ • RxJavaΛ࢖Θͣʹ࣮૷͢Δ৔߹ͱൺֱͨ͠ϝϦοτ͸ʁ •

   OperatorΛ૊Έ߹ΘͤΔ͜ͱͰॊೈͳΤϥʔϋϯυϦ ϯάΛ࣮૷͢Δ͜ͱ͕ग़དྷ·͢

6. ຊηογϣϯͰ͓఻͍͑ͨ͜͠ͱ • RxJavaͬͯOperator͕ଟͯ͘೉ͦ͠͏ • ΤϥʔϋϯυϦϯά༻ͷOperator͸ଟ͋͘Γ·ͤΜ • Ϣʔεέʔε͔Βߟ͑ͯΈΔͱ͍͍͔΋ • RxJavaΛ࢖Θͣʹ࣮૷͢Δ৔߹ͱൺֱͨ͠ϝϦοτ͸ʁ •

   OperatorΛ૊Έ߹ΘͤΔ͜ͱͰॊೈͳΤϥʔϋϯυϦ ϯάΛ࣮૷͢Δ͜ͱ͕ग़དྷ·͢

7. ຊηογϣϯͰ͓఻͍͑ͨ͜͠ͱ • RxJavaͬͯOperator͕ଟͯ͘೉ͦ͠͏ • ΤϥʔϋϯυϦϯά༻ͷOperator͸ଟ͋͘Γ·ͤΜ • Ϣʔεέʔε͔Βߟ͑ͯΈΔͱ͍͍͔΋ • RxJavaΛ࢖Θͣʹ࣮૷͢Δ৔߹ͱൺֱͨ͠ϝϦοτ͸ʁ •

   OperatorΛ૊Έ߹ΘͤΔ͜ͱͰॊೈͳΤϥʔϋϯυϦ ϯάΛ࣮૷͢Δ͜ͱ͕ग़དྷ·͢

8. ໨࣍ • RxJavaͷ͓͞Β͍ • RxJavaʹ͓͚ΔΤϥʔϋϯυϦϯά • جຊฤ • Ԡ༻ฤ •

   ࣮ફฤ • ·ͱΊ

9. ໨࣍ɿجຊฤ • αϯϓϧɿެࣜΞϓϦͷContributorΛදࣔ͢Δ • ΤϥʔΛτʔετͰදࣔ͢Δ • ୅ΘΓͷσʔλΛදࣔ͢Δ • ΤϥʔͷछྨͰॲཧΛ෼ذ͢Δ •

   ϦτϥΠ͢Δ • ϦτϥΠ͢Δ͔ΛϢʔβʔʹਘͶΔ

10. ໨࣍ɿԠ༻ฤ • جຊฤͰొ৔ͨ͠ΤϥʔϋϯυϦϯάΛ૊Έ߹ΘͤΔ • Ϣʔεέʔε1 • ϦτϥΠΛ3ճߦ͏ • μϝͳΒΩϟογϡΛදࣔ͢Δ •

    Ϣʔεέʔε2 • ϦτϥΠΛ3ճߦ͏ • μϝͳΒΩϟογϡΛදࣔ͢Δ • Ωϟογϡ͕ͳ͍৔߹͸τʔετΛදࣔ͢Δ

11. ໨࣍ɿ࣮ફฤ • RetrofitͷΤϥʔϋϯυϦϯά

12. ໨࣍ • RxJavaͷ͓͞Β͍ • RxJavaʹ͓͚ΔΤϥʔϋϯυϦϯά • جຊฤ • Ԡ༻ฤ •

    ࣮ફฤ • ·ͱΊ

13. RxJavaͷ͓͞Β͍ • Reactive Extension for Java • ඇಉظετϦʔϜ • σʔλϑϩʔΛఆٛͯ͠ɺมߋΛ఻ൖͤ͞Δ

    ग़యɿhttp://reactivex.io/

14. ໨࣍ • RxJavaͷ͓͞Β͍ • RxJavaʹ͓͚ΔΤϥʔϋϯυϦϯά • جຊฤ • Ԡ༻ฤ •

    ࣮ફฤ • ·ͱΊ

15. RxJavaʹ͓͚ΔΤϥʔϋϯυϦϯά • Catch • Τϥʔൃੜ࣌ʹϦΧόϦʔΛߦ͏ • onError, onErrorReturn, onErrorResumeNext •

    Retry • Τϥʔൃੜ࣌ʹresubscribe͢Δ • retry, retryWhen

16. Catch • onError • onErrorReturn • onErrorResumeNext

17. Catch • onError • onErrorReturn • onErrorResumeNext

18. onError • Τϥʔ͕Τϛοτ͞Εͨͱ͖ʹݺͼग़͞ΕΔ

19. onError Observable.create(new Action1<Emitter<String>>() {
 @Override
 public void call(Emitter<String> emitter) {


    emitter.onNext("onNext");
 emitter.onError(new RuntimeException("Something went wrong"));
 }
 }, Emitter.BackpressureMode.NONE)
 .subscribe(new Subscriber<String>() {
 @Override
 public void onCompleted() {
 Log.d("ErrorHandlingInRxJava", "onCompleted");
 }
 
 @Override
 public void onError(Throwable e) {
 Log.d("ErrorHandlingInRxJava", e.getMessage());
 }
 
 @Override
 public void onNext(String s) {
 Log.d("ErrorHandlingInRxJava", s);
 }
 });

20. onError Observable.create(new Action1<Emitter<String>>() {
 @Override
 public void call(Emitter<String> emitter) {


    emitter.onNext("onNext");
 emitter.onError(new RuntimeException("Something went wrong"));
 }
 }, Emitter.BackpressureMode.NONE)
 .subscribe(new Subscriber<String>() {
 @Override
 public void onCompleted() {
 Log.d("ErrorHandlingInRxJava", "onCompleted");
 }
 
 @Override
 public void onError(Throwable e) {
 Log.d("ErrorHandlingInRxJava", e.getMessage());
 }
 
 @Override
 public void onNext(String s) {
 Log.d("ErrorHandlingInRxJava", s);
 }
 });

21. onError Observable.create(new Action1<Emitter<String>>() {
 @Override
 public void call(Emitter<String> emitter) {


    emitter.onNext("onNext");
 emitter.onError(new RuntimeException("Something went wrong"));
 }
 }, Emitter.BackpressureMode.NONE)
 .subscribe(new Subscriber<String>() {
 @Override
 public void onCompleted() {
 Log.d("ErrorHandlingInRxJava", "onCompleted");
 }
 
 @Override
 public void onError(Throwable e) {
 Log.d("ErrorHandlingInRxJava", e.getMessage());
 }
 
 @Override
 public void onNext(String s) {
 Log.d("ErrorHandlingInRxJava", s);
 }
 });

22. onError Observable.create(new Action1<Emitter<String>>() {
 @Override
 public void call(Emitter<String> emitter) {


    emitter.onNext("onNext");
 emitter.onError(new RuntimeException("Something went wrong"));
 }
 }, Emitter.BackpressureMode.NONE)
 .subscribe(new Subscriber<String>() {
 @Override
 public void onCompleted() {
 Log.d("ErrorHandlingInRxJava", "onCompleted");
 }
 
 @Override
 public void onError(Throwable e) {
 Log.d("ErrorHandlingInRxJava", e.getMessage());
 }
 
 @Override
 public void onNext(String s) {
 Log.d("ErrorHandlingInRxJava", s);
 }
 });

23. onError Observable.create(new Action1<Emitter<String>>() {
 @Override
 public void call(Emitter<String> emitter) {


    emitter.onNext("onNext");
 emitter.onError(new RuntimeException("Something went wrong"));
 }
 }, Emitter.BackpressureMode.NONE)
 .subscribe(new Subscriber<String>() {
 @Override
 public void onCompleted() {
 Log.d("ErrorHandlingInRxJava", "onCompleted");
 }
 
 @Override
 public void onError(Throwable e) {
 Log.d("ErrorHandlingInRxJava", e.getMessage());
 }
 
 @Override
 public void onNext(String s) {
 Log.d("ErrorHandlingInRxJava", s);
 }
 });

24. onError Observable.create(new Action1<Emitter<String>>() {
 @Override
 public void call(Emitter<String> emitter) {


    emitter.onNext("onNext");
 emitter.onError(new RuntimeException("Something went wrong"));
 }
 }, Emitter.BackpressureMode.NONE)
 .subscribe(new Subscriber<String>() {
 @Override
 public void onCompleted() {
 Log.d("ErrorHandlingInRxJava", "onCompleted");
 }
 
 @Override
 public void onError(Throwable e) {
 Log.d("ErrorHandlingInRxJava", e.getMessage());
 }
 
 @Override
 public void onNext(String s) {
 Log.d("ErrorHandlingInRxJava", s);
 }
 }); D/ErrorHandlingInRxJava: onNext

25. onError Observable.create(new Action1<Emitter<String>>() {
 @Override
 public void call(Emitter<String> emitter) {


    emitter.onNext("onNext");
 emitter.onError(new RuntimeException("Something went wrong"));
 }
 }, Emitter.BackpressureMode.NONE)
 .subscribe(new Subscriber<String>() {
 @Override
 public void onCompleted() {
 Log.d("ErrorHandlingInRxJava", "onCompleted");
 }
 
 @Override
 public void onError(Throwable e) {
 Log.d("ErrorHandlingInRxJava", e.getMessage());
 }
 
 @Override
 public void onNext(String s) {
 Log.d("ErrorHandlingInRxJava", s);
 }
 }); D/ErrorHandlingInRxJava: onNext

26. onError Observable.create(new Action1<Emitter<String>>() {
 @Override
 public void call(Emitter<String> emitter) {


    emitter.onNext("onNext");
 emitter.onError(new RuntimeException("Something went wrong"));
 }
 }, Emitter.BackpressureMode.NONE)
 .subscribe(new Subscriber<String>() {
 @Override
 public void onCompleted() {
 Log.d("ErrorHandlingInRxJava", "onCompleted");
 }
 
 @Override
 public void onError(Throwable e) {
 Log.d("ErrorHandlingInRxJava", e.getMessage());
 }
 
 @Override
 public void onNext(String s) {
 Log.d("ErrorHandlingInRxJava", s);
 }
 }); D/ErrorHandlingInRxJava: onNext

27. onError Observable.create(new Action1<Emitter<String>>() {
 @Override
 public void call(Emitter<String> emitter) {


    emitter.onNext("onNext");
 emitter.onError(new RuntimeException("Something went wrong"));
 }
 }, Emitter.BackpressureMode.NONE)
 .subscribe(new Subscriber<String>() {
 @Override
 public void onCompleted() {
 Log.d("ErrorHandlingInRxJava", "onCompleted");
 }
 
 @Override
 public void onError(Throwable e) {
 Log.d("ErrorHandlingInRxJava", e.getMessage());
 }
 
 @Override
 public void onNext(String s) {
 Log.d("ErrorHandlingInRxJava", s);
 }
 }); D/ErrorHandlingInRxJava: onNext D/ErrorHandlingInRxJava: Something went wrong

28. onError • Τϥʔ͕Τϛοτ͞Εͨͱ͖ʹݺͼग़͞ΕΔ • Τϥʔ಺༰͕Throwableͱͯ͠౉͞ΕΔ • ThrowableΛ࢖ͬͯΤϥʔϋϯυϦϯάΛߦ͏

29. Catch • onError • onErrorReturn • onErrorResumeNext

30. onErrorReturn • Τϥʔ͕Τϛοτ͞Εͨ৔߹ʹ୅ΘΓͷσʔλΛฦ͢ ग़యɿhttp://reactivex.io/

31. onErrorReturn Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorReturn(new Func1<Throwable, String>() {
 @Override
 public

    String call(Throwable throwable) {
 return "onErrorReturn";
 }
 })
 .subscribe(new LoggingSubscriber());

32. onErrorReturn Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorReturn(new Func1<Throwable, String>() {
 @Override
 public

    String call(Throwable throwable) {
 return "onErrorReturn";
 }
 })
 .subscribe(new LoggingSubscriber());

33. NextThenError public class NextThenError implements Action1<Emitter<String>> {
 
 @Override
 public

    void call(Emitter<String> emitter) {
 emitter.onNext("onNext");
 emitter.onError(new RuntimeException("Something went wrong"));
 }
 
 } 1ͭ໨ͷΞΠςϜͱͯ͠ʮonNextʯΛΤϛοτ͢Δ 2ͭ໨ͷΞΠςϜͱͯ͠ʮRuntimeExceptionʯΛΤϛοτ͢Δ

34. LoggingSubscriber public class LoggingSubscriber extends Subscriber<String> {
 
 @Override
 public

    void onCompleted() {
 Log.d("ErrorHandlingInRxJava", "onCompleted");
 }
 
 @Override
 public void onError(Throwable e) {
 Log.d("ErrorHandlingInRxJava", e.getMessage());
 }
 
 @Override
 public void onNext(String s) {
 Log.d("ErrorHandlingInRxJava", s);
 }
 
 } Observable͔ΒྲྀΕ͖ͯͨΠϕϯτΛϩάʹදࣔ͢Δ

35. onErrorReturn Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorReturn(new Func1<Throwable, String>() {
 @Override
 public

    String call(Throwable throwable) {
 return "onErrorReturn";
 }
 })
 .subscribe(new LoggingSubscriber());

36. onErrorReturn Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorReturn(new Func1<Throwable, String>() {
 @Override
 public

    String call(Throwable throwable) {
 return "onErrorReturn";
 }
 })
 .subscribe(new LoggingSubscriber());

37. onErrorReturn Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorReturn(new Func1<Throwable, String>() {
 @Override
 public

    String call(Throwable throwable) {
 return "onErrorReturn";
 }
 })
 .subscribe(new LoggingSubscriber()); onErrorReturn( )

38. onErrorReturn Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorReturn(new Func1<Throwable, String>() {
 @Override
 public

    String call(Throwable throwable) {
 return "onErrorReturn";
 }
 })
 .subscribe(new LoggingSubscriber()); onErrorReturn( )

39. onErrorReturn Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorReturn(new Func1<Throwable, String>() {
 @Override
 public

    String call(Throwable throwable) {
 return "onErrorReturn";
 }
 })
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext onErrorReturn( )

40. onErrorReturn Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorReturn(new Func1<Throwable, String>() {
 @Override
 public

    String call(Throwable throwable) {
 return "onErrorReturn";
 }
 })
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext onErrorReturn( )

41. onErrorReturn Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorReturn(new Func1<Throwable, String>() {
 @Override
 public

    String call(Throwable throwable) {
 return "onErrorReturn";
 }
 })
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext onErrorReturn( )

42. onErrorReturn Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorReturn(new Func1<Throwable, String>() {
 @Override
 public

    String call(Throwable throwable) {
 return "onErrorReturn";
 }
 })
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext onErrorReturn( )

43. onErrorReturn Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorReturn(new Func1<Throwable, String>() {
 @Override
 public

    String call(Throwable throwable) {
 return "onErrorReturn";
 }
 })
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext D/ErrorHandlingInRxJava: onErrorReturn onErrorReturn( )

44. onErrorReturn Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorReturn(new Func1<Throwable, String>() {
 @Override
 public

    String call(Throwable throwable) {
 return "onErrorReturn";
 }
 })
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext D/ErrorHandlingInRxJava: onErrorReturn D/ErrorHandlingInRxJava: onCompleted onErrorReturn( )

45. onErrorReturn • Τϥʔ͕ൃੜͨ͠৔߹ʹ୅ΘΓͷσʔλΛฦ͢ • Τϥʔ಺༰͸Throwableͱͯ͠౉͞ΕΔ • ThrowableΛ΋ͱʹ୅ΘΓͷσʔλΛฦ͢ • ΋ͱͷObservable͸Complete͢Δ

46. Catch • onError • onErrorReturn • onErrorResumeNext

47. onErrorResumeNext • Τϥʔ͕Τϛοτ͞Εͨ৔߹ʹ୅ΘΓͷObservableΛ ฦ͢ ग़యɿhttp://reactivex.io/

48. onErrorResumeNext Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends String>>()

    {
 @Override
 public Observable<? extends String> call(
 Throwable throwable) {
 return Observable.just("onErrorResumeNext");
 }
 }
 )
 .subscribe(new LoggingSubscriber());

49. onErrorResumeNext Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends String>>()

    {
 @Override
 public Observable<? extends String> call(
 Throwable throwable) {
 return Observable.just("onErrorResumeNext");
 }
 }
 )
 .subscribe(new LoggingSubscriber());

50. onErrorResumeNext Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends String>>()

    {
 @Override
 public Observable<? extends String> call(
 Throwable throwable) {
 return Observable.just("onErrorResumeNext");
 }
 }
 )
 .subscribe(new LoggingSubscriber()); onErrorResumeNext( )

51. onErrorResumeNext Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends String>>()

    {
 @Override
 public Observable<? extends String> call(
 Throwable throwable) {
 return Observable.just("onErrorResumeNext");
 }
 }
 )
 .subscribe(new LoggingSubscriber()); onErrorResumeNext( )

52. onErrorResumeNext Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends String>>()

    {
 @Override
 public Observable<? extends String> call(
 Throwable throwable) {
 return Observable.just("onErrorResumeNext");
 }
 }
 )
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext onErrorResumeNext( )

53. onErrorResumeNext Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends String>>()

    {
 @Override
 public Observable<? extends String> call(
 Throwable throwable) {
 return Observable.just("onErrorResumeNext");
 }
 }
 )
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext onErrorResumeNext( )

54. onErrorResumeNext Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends String>>()

    {
 @Override
 public Observable<? extends String> call(
 Throwable throwable) {
 return Observable.just("onErrorResumeNext");
 }
 }
 )
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext onErrorResumeNext( )

55. onErrorResumeNext Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends String>>()

    {
 @Override
 public Observable<? extends String> call(
 Throwable throwable) {
 return Observable.just("onErrorResumeNext");
 }
 }
 )
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext onErrorResumeNext( )

56. onErrorResumeNext Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends String>>()

    {
 @Override
 public Observable<? extends String> call(
 Throwable throwable) {
 return Observable.just("onErrorResumeNext");
 }
 }
 )
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext D/ErrorHandlingInRxJava: onErrorResumeNext onErrorResumeNext( )

57. onErrorResumeNext Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends String>>()

    {
 @Override
 public Observable<? extends String> call(
 Throwable throwable) {
 return Observable.just("onErrorResumeNext");
 }
 }
 )
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext D/ErrorHandlingInRxJava: onErrorResumeNext D/ErrorHandlingInRxJava: onCompleted onErrorResumeNext( )

58. onErrorResumeNext • Τϥʔ͕ൃੜͨ͠৔߹ʹ୅ΘΓͷObservableΛฦ͢ • Τϥʔ಺༰͸Throwableͱͯ͠౉͞ΕΔ • ThrowableΛ΋ͱʹ୅ΘΓͷObservableΛฦ͢ • ΋ͱͷObservable͸Complete͢Δ

59. Retry • retry • retryWhen

60. Retry • retry • retryWhen

61. retry • Τϥʔ͕Τϛοτ͞Εͨ৔߹ʹresubscribe͢Δ ग़యɿhttp://reactivex.io/

62. retry Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retry(1)
 .subscribe(new LoggingSubscriber());

63. retry Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retry(1)
 .subscribe(new LoggingSubscriber());

64. retry Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retry(1)
 .subscribe(new LoggingSubscriber()); retry(1)

65. retry Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retry(1)
 .subscribe(new LoggingSubscriber()); retry(1)

66. retry Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retry(1)
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext retry(1)

67. retry Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retry(1)
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext retry(1)

68. retry Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retry(1)
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext retry(1)

69. retry Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retry(1)
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext retry(1)

    subscribe

70. retry Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retry(1)
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext retry(1)

    subscribe

71. retry Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retry(1)
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext D/ErrorHandlingInRxJava:

    onNext retry(1) subscribe

72. retry Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retry(1)
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext D/ErrorHandlingInRxJava:

    onNext retry(1) subscribe

73. retry Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retry(1)
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext D/ErrorHandlingInRxJava:

    onNext D/ErrorHandlingInRxJava: Something went wrong retry(1) subscribe

74. retry • Τϥʔ͕Τϛοτ͞Εͨ৔߹ʹresubscribe͢Δ • Τϥʔ͕Τϛοτ͞Εͨ৔߹ʹଈ࠲ʹresubscribe͢Δ • Ҿ਺Ͱճ਺Λࢦఆ͢Δ͜ͱ͕ग़དྷΔ

75. Retry • retry • retryWhen

76. retryWhen • resubscribe͢Δ৚݅Λࡉ੍͔͘ޚͰ͖Δ • resubscribe͢ΔͨΊͷτϦΨʔͱͳΔObservableΛฦ͢ • τϦΨʔʹNextΛΤϛοτ͢Δͱresubscribe • τϦΨʔʹCompleteΛΤϛοτ͢ΔͱComplete •

    τϦΨʔʹErrorΛΤϛοτ͢ΔͱError ग़యɿhttp://reactivex.io/

77. retryWhen • ϚʔϒϧμΠΞάϥϜͰߟ͑ͯΈΔ ग़యɿhttp://reactivex.io/

78. retryWhen • Τϥʔͷ··ऴྃ͢Δ • Τϥʔ࣌ʹComplete͢Δ • গ࣌ؒ͠Λ͓͍ͯϦτϥΠ͢Δ

79. retryWhen • Τϥʔͷ··ऴྃ͢Δ • Τϥʔ࣌ʹComplete͢Δ • গ࣌ؒ͠Λ͓͍ͯϦτϥΠ͢Δ

80. Τϥʔͷ··ऴྃ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable ->
 observable.flatMap(Observable::error)
 )
 .subscribe(new LoggingSubscriber());

81. Τϥʔͷ··ऴྃ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable ->
 observable.flatMap(Observable::error)
 )
 .subscribe(new LoggingSubscriber());

82. Τϥʔͷ··ऴྃ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable ->
 observable.flatMap(Observable::error)
 )
 .subscribe(new LoggingSubscriber());

    retryWhen ( )

83. Τϥʔͷ··ऴྃ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable ->
 observable.flatMap(Observable::error)
 )
 .subscribe(new LoggingSubscriber());

    retryWhen ( )

84. Τϥʔͷ··ऴྃ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable ->
 observable.flatMap(Observable::error)
 )
 .subscribe(new LoggingSubscriber());

    D/ErrorHandlingInRxJava: onNext retryWhen ( )

85. Τϥʔͷ··ऴྃ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable ->
 observable.flatMap(Observable::error)
 )
 .subscribe(new LoggingSubscriber());

    D/ErrorHandlingInRxJava: onNext retryWhen ( )

86. Τϥʔͷ··ऴྃ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable ->
 observable.flatMap(Observable::error)
 )
 .subscribe(new LoggingSubscriber());

    D/ErrorHandlingInRxJava: onNext retryWhen ( )

87. Τϥʔͷ··ऴྃ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable ->
 observable.flatMap(Observable::error)
 )
 .subscribe(new LoggingSubscriber());

    D/ErrorHandlingInRxJava: onNext retryWhen ( )

88. Τϥʔͷ··ऴྃ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable ->
 observable.flatMap(Observable::error)
 )
 .subscribe(new LoggingSubscriber());

    D/ErrorHandlingInRxJava: onNext D/ErrorHandlingInRxJava: Something went wrong retryWhen ( )

89. retryWhen • Τϥʔͷ··ऴྃ͢Δ • Τϥʔ࣌ʹComplete͢Δ • গ࣌ؒ͠Λ͓͍ͯϦτϥΠ͢Δ

90. Τϥʔ࣌ʹComplete͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable ->
 observable.first().ignoreElements()
 )
 .subscribe(new LoggingSubscriber());

91. Τϥʔ࣌ʹComplete͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable ->
 observable.first().ignoreElements()
 )
 .subscribe(new LoggingSubscriber());

92. Τϥʔ࣌ʹComplete͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable ->
 observable.first().ignoreElements()
 )
 .subscribe(new LoggingSubscriber());

    retryWhen ( )

93. Τϥʔ࣌ʹComplete͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable ->
 observable.first().ignoreElements()
 )
 .subscribe(new LoggingSubscriber());

    retryWhen ( )

94. Τϥʔ࣌ʹComplete͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable ->
 observable.first().ignoreElements()
 )
 .subscribe(new LoggingSubscriber());

    retryWhen ( )

95. Τϥʔ࣌ʹComplete͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable ->
 observable.first().ignoreElements()
 )
 .subscribe(new LoggingSubscriber());

    retryWhen ( )

96. Τϥʔ࣌ʹComplete͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable ->
 observable.first().ignoreElements()
 )
 .subscribe(new LoggingSubscriber());

    D/ErrorHandlingInRxJava: onNext retryWhen ( )

97. Τϥʔ࣌ʹComplete͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable ->
 observable.first().ignoreElements()
 )
 .subscribe(new LoggingSubscriber());

    D/ErrorHandlingInRxJava: onNext retryWhen ( )

98. Τϥʔ࣌ʹComplete͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable ->
 observable.first().ignoreElements()
 )
 .subscribe(new LoggingSubscriber());

    D/ErrorHandlingInRxJava: onNext retryWhen ( )

99. Τϥʔ࣌ʹComplete͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable ->
 observable.first().ignoreElements()
 )
 .subscribe(new LoggingSubscriber());

    D/ErrorHandlingInRxJava: onNext retryWhen ( )

100. Τϥʔ࣌ʹComplete͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable ->
 observable.first().ignoreElements()
 )
 .subscribe(new LoggingSubscriber());

     D/ErrorHandlingInRxJava: onNext D/ErrorHandlingInRxJava: onCompleted retryWhen ( )

101. ࣌ؒΛ͓͍ͯϦτϥΠ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable -> 
 observable.first().flatMap(throwable -> 


     Observable.timer(3, TimeUnit.SECONDS)
 )
 )
 .subscribe(new LoggingSubscriber());

102. ࣌ؒΛ͓͍ͯϦτϥΠ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable -> 
 observable.first().flatMap(throwable -> 


     Observable.timer(3, TimeUnit.SECONDS)
 )
 )
 .subscribe(new LoggingSubscriber());

103. ࣌ؒΛ͓͍ͯϦτϥΠ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable -> 
 observable.first().flatMap(throwable -> 


     Observable.timer(3, TimeUnit.SECONDS)
 )
 )
 .subscribe(new LoggingSubscriber()); retryWhen ( )

104. ࣌ؒΛ͓͍ͯϦτϥΠ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable -> 
 observable.first().flatMap(throwable -> 


     Observable.timer(3, TimeUnit.SECONDS)
 )
 )
 .subscribe(new LoggingSubscriber()); retryWhen ( )

105. ࣌ؒΛ͓͍ͯϦτϥΠ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable -> 
 observable.first().flatMap(throwable -> 


     Observable.timer(3, TimeUnit.SECONDS)
 )
 )
 .subscribe(new LoggingSubscriber()); retryWhen ( )

106. ࣌ؒΛ͓͍ͯϦτϥΠ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable -> 
 observable.first().flatMap(throwable -> 


     Observable.timer(3, TimeUnit.SECONDS)
 )
 )
 .subscribe(new LoggingSubscriber()); retryWhen ( )

107. ࣌ؒΛ͓͍ͯϦτϥΠ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable -> 
 observable.first().flatMap(throwable -> 


     Observable.timer(3, TimeUnit.SECONDS)
 )
 )
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext retryWhen ( )

108. ࣌ؒΛ͓͍ͯϦτϥΠ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable -> 
 observable.first().flatMap(throwable -> 


     Observable.timer(3, TimeUnit.SECONDS)
 )
 )
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext retryWhen ( )

109. ࣌ؒΛ͓͍ͯϦτϥΠ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable -> 
 observable.first().flatMap(throwable -> 


     Observable.timer(3, TimeUnit.SECONDS)
 )
 )
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext retryWhen ( )

110. ࣌ؒΛ͓͍ͯϦτϥΠ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable -> 
 observable.first().flatMap(throwable -> 


     Observable.timer(3, TimeUnit.SECONDS)
 )
 )
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext retryWhen ( )

111. ࣌ؒΛ͓͍ͯϦτϥΠ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable -> 
 observable.first().flatMap(throwable -> 


     Observable.timer(3, TimeUnit.SECONDS)
 )
 )
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext retryWhen ( ) subscribe

112. ࣌ؒΛ͓͍ͯϦτϥΠ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable -> 
 observable.first().flatMap(throwable -> 


     Observable.timer(3, TimeUnit.SECONDS)
 )
 )
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext retryWhen ( ) subscribe

113. ࣌ؒΛ͓͍ͯϦτϥΠ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable -> 
 observable.first().flatMap(throwable -> 


     Observable.timer(3, TimeUnit.SECONDS)
 )
 )
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext D/ErrorHandlingInRxJava: onNext retryWhen ( ) subscribe

114. ࣌ؒΛ͓͍ͯϦτϥΠ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable -> 
 observable.first().flatMap(throwable -> 


     Observable.timer(3, TimeUnit.SECONDS)
 )
 )
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext D/ErrorHandlingInRxJava: onNext retryWhen ( ) subscribe

115. ࣌ؒΛ͓͍ͯϦτϥΠ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable -> 
 observable.first().flatMap(throwable -> 


     Observable.timer(3, TimeUnit.SECONDS)
 )
 )
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext D/ErrorHandlingInRxJava: onNext retryWhen ( ) subscribe

116. ࣌ؒΛ͓͍ͯϦτϥΠ͢Δ Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
 .retryWhen(observable -> 
 observable.first().flatMap(throwable -> 


     Observable.timer(3, TimeUnit.SECONDS)
 )
 )
 .subscribe(new LoggingSubscriber()); D/ErrorHandlingInRxJava: onNext D/ErrorHandlingInRxJava: onNext D/ErrorHandlingInRxJava: onCompleted retryWhen ( ) subscribe

117. ໨࣍ • RxJavaͷ͓͞Β͍ • RxJavaʹ͓͚ΔΤϥʔϋϯυϦϯά • جຊฤ • Ԡ༻ฤ •

     ࣮ફฤ • ·ͱΊ

118. جຊฤ • ΤϥʔΛτʔετͰදࣔ͢Δ • ୅ΘΓͷσʔλΛදࣔ͢Δ • ΤϥʔͷछྨͰॲཧΛ෼ذ͢Δ • ϦτϥΠ͢Δ •

     ϦτϥΠ͢Δ͔ΛϢʔβʔʹਘͶΔ

119. جຊฤ • ΤϥʔΛτʔετͰදࣔ͢Δ • ୅ΘΓͷσʔλΛදࣔ͢Δ • ΤϥʔͷछྨͰॲཧΛ෼ذ͢Δ • ϦτϥΠ͢Δ •

     ϦτϥΠ͢Δ͔ΛϢʔβʔʹਘͶΔ

120. ΤϥʔΛτʔετͰදࣔ͢Δ • Ϣʔεέʔε • ΤϥʔϝοηʔδΛදࣔ͢Δ • ࣮૷ํ਑ • ObservableʹྲྀΕͨΤϥʔΛΩϟον͢Δ •

     onError

121. ΤϥʔΛτʔετͰදࣔ͢Δ

122. ΤϥʔΛτʔετͰදࣔ͢Δ githubRepository.getDroidKaigiContributors()
 .subscribeOn(Schedulers.io())
 .observeOn(AndroidSchedulers.mainThread())
 .subscribe(new Subscriber<List<GithubContributor>>() {
 @Override
 public void

     onCompleted() {}
 
 @Override
 public void onError(Throwable e) {
 Toast.makeText(MainActivity.this, e.getMessage(),
 Toast.LENGTH_SHORT).show();
 }
 
 @Override
 public void onNext(List<GithubContributor> githubContributors) {
 // Write your awesome logic
 }
 });

123. ΤϥʔΛτʔετͰදࣔ͢Δ githubRepository.getDroidKaigiContributors()
 .subscribeOn(Schedulers.io())
 .observeOn(AndroidSchedulers.mainThread())
 .subscribe(new Subscriber<List<GithubContributor>>() {
 @Override
 public void

     onCompleted() {}
 
 @Override
 public void onError(Throwable e) {
 Toast.makeText(MainActivity.this, e.getMessage(),
 Toast.LENGTH_SHORT).show();
 }
 
 @Override
 public void onNext(List<GithubContributor> githubContributors) {
 // Write your awesome logic
 }
 });

124. ΤϥʔΛτʔετͰදࣔ͢Δ githubRepository.getDroidKaigiContributors()
 .subscribeOn(Schedulers.io())
 .observeOn(AndroidSchedulers.mainThread())
 .subscribe(new Subscriber<List<GithubContributor>>() {
 @Override
 public void

     onCompleted() {}
 
 @Override
 public void onError(Throwable e) {
 Toast.makeText(MainActivity.this, e.getMessage(),
 Toast.LENGTH_SHORT).show();
 }
 
 @Override
 public void onNext(List<GithubContributor> githubContributors) {
 // Write your awesome logic
 }
 });

125. ΤϥʔΛτʔετͰදࣔ͢Δ githubRepository.getDroidKaigiContributors()
 .subscribeOn(Schedulers.io())
 .observeOn(AndroidSchedulers.mainThread())
 .subscribe(new Subscriber<List<GithubContributor>>() {
 @Override
 public void

     onCompleted() {}
 
 @Override
 public void onError(Throwable e) {
 Toast.makeText(MainActivity.this, e.getMessage(),
 Toast.LENGTH_SHORT).show();
 }
 
 @Override
 public void onNext(List<GithubContributor> githubContributors) {
 // Write your awesome logic
 }
 });

126. ΤϥʔΛτʔετͰදࣔ͢Δ githubRepository.getDroidKaigiContributors()
 .subscribeOn(Schedulers.io())
 .observeOn(AndroidSchedulers.mainThread())
 .subscribe(new Subscriber<List<GithubContributor>>() {
 @Override
 public void

     onCompleted() {}
 
 @Override
 public void onError(Throwable e) {
 Toast.makeText(MainActivity.this, e.getMessage(),
 Toast.LENGTH_SHORT).show();
 }
 
 @Override
 public void onNext(List<GithubContributor> githubContributors) {
 // Write your awesome logic
 }
 });

127. جຊฤ • ΤϥʔΛτʔετͰදࣔ͢Δ • ୅ΘΓͷσʔλΛදࣔ͢Δ • ΤϥʔͷछྨͰॲཧΛ෼ذ͢Δ • ϦτϥΠ͢Δ •

     ϦτϥΠ͢Δ͔ΛϢʔβʔʹਘͶΔ

128. ୅ΘΓͷσʔλΛදࣔ͢Δ • Ϣʔεέʔε • αʔόʔ͔Βσʔλ͕औಘͰ͖ͳ͔ͬͨ৔߹ʹɺΩϟο γϡ͍ͯ͠ΔσʔλΛදࣔ͢Δ • ࣮૷ํ਑ • ObservableʹྲྀΕͨΤϥʔΛΩϟον͢Δ

     • ୅ΘΓʹΩϟογϡ͔ΒऔΓग़ͨ͠σʔλΛྲྀ͢ • onErrorReturn

129. ୅ΘΓͷσʔλΛදࣔ͢Δ

130. ୅ΘΓͷσʔλΛදࣔ͢Δ client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
 .doOnNext(new Action1<List<GithubContributor>>() {
 @Override
 public void

     call(List<GithubContributor> githubContributors) {
 dao.insertAll(githubContributors); // DBʹอଘ
 }
 })
 .onErrorReturn(new Func1<Throwable, List<GithubContributor>>() {
 @Override
 public List<GithubContributor> call(Throwable throwable) {
 return dao.findAll(); // DB͔Βऔಘ
 }
 });

131. ୅ΘΓͷσʔλΛදࣔ͢Δ client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
 .doOnNext(new Action1<List<GithubContributor>>() {
 @Override
 public void

     call(List<GithubContributor> githubContributors) {
 dao.insertAll(githubContributors); // DBʹอଘ
 }
 })
 .onErrorReturn(new Func1<Throwable, List<GithubContributor>>() {
 @Override
 public List<GithubContributor> call(Throwable throwable) {
 return dao.findAll(); // DB͔Βऔಘ
 }
 });

132. ୅ΘΓͷσʔλΛදࣔ͢Δ client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
 .doOnNext(new Action1<List<GithubContributor>>() {
 @Override
 public void

     call(List<GithubContributor> githubContributors) {
 dao.insertAll(githubContributors); // DBʹอଘ
 }
 })
 .onErrorReturn(new Func1<Throwable, List<GithubContributor>>() {
 @Override
 public List<GithubContributor> call(Throwable throwable) {
 return dao.findAll(); // DB͔Βऔಘ
 }
 });

133. ୅ΘΓͷσʔλΛදࣔ͢Δ client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
 .doOnNext(new Action1<List<GithubContributor>>() {
 @Override
 public void

     call(List<GithubContributor> githubContributors) {
 dao.insertAll(githubContributors); // DBʹอଘ
 }
 })
 .onErrorReturn(new Func1<Throwable, List<GithubContributor>>() {
 @Override
 public List<GithubContributor> call(Throwable throwable) {
 return dao.findAll(); // DB͔Βऔಘ
 }
 });

134. جຊฤ • ΤϥʔΛτʔετͰදࣔ͢Δ • ୅ΘΓͷσʔλΛදࣔ͢Δ • ΤϥʔͷछྨͰॲཧΛ෼ذ͢Δ • ϦτϥΠ͢Δ •

     ϦτϥΠ͢Δ͔ΛϢʔβʔʹਘͶΔ

135. ΤϥʔͷछྨͰॲཧΛ෼ذ͢Δ • Ϣʔεέʔε • αʔόʔ͕ฦͨ͠ΤϥʔίʔυʹΑͬͯॲཧΛ෼ذ͢ Δ • ࣮૷ํ਑ • ObservableʹྲྀΕͨΤϥʔΛΩϟον͢Δ

     • ΤϥʔͷछྨΛ΋ͱʹॲཧΛ෼ذ͢Δ • onErrorResumeNext

136. ΤϥʔͷछྨͰॲཧΛ෼ذ͢Δ client.getDroidKaigiContributors()
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends List<GithubContributor>>>() {
 @Override


     public Observable<? extends List<GithubContributor>> call(
 Throwable throwable) {
 if (throwable instanceof AccessTokenExpiredException) {
 // ϩάΞ΢τ
 }
 
 if (throwable instanceof MaintenanceModeException) {
 // ϝϯςφϯεϞʔυ
 }
 
 return Observable.error(throwable);
 }
 }
 );

137. ΤϥʔͷछྨͰॲཧΛ෼ذ͢Δ client.getDroidKaigiContributors()
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends List<GithubContributor>>>() {
 @Override


     public Observable<? extends List<GithubContributor>> call(
 Throwable throwable) {
 if (throwable instanceof AccessTokenExpiredException) {
 // ϩάΞ΢τ
 }
 
 if (throwable instanceof MaintenanceModeException) {
 // ϝϯςφϯεϞʔυ
 }
 
 return Observable.error(throwable);
 }
 }
 );

138. ΤϥʔͷछྨͰॲཧΛ෼ذ͢Δ client.getDroidKaigiContributors()
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends List<GithubContributor>>>() {
 @Override


     public Observable<? extends List<GithubContributor>> call(
 Throwable throwable) {
 if (throwable instanceof AccessTokenExpiredException) {
 // ϩάΞ΢τ
 }
 
 if (throwable instanceof MaintenanceModeException) {
 // ϝϯςφϯεϞʔυ
 }
 
 return Observable.error(throwable);
 }
 }
 );

139. ΤϥʔͷछྨͰॲཧΛ෼ذ͢Δ client.getDroidKaigiContributors()
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends List<GithubContributor>>>() {
 @Override


     public Observable<? extends List<GithubContributor>> call(
 Throwable throwable) {
 if (throwable instanceof AccessTokenExpiredException) {
 // ϩάΞ΢τ
 }
 
 if (throwable instanceof MaintenanceModeException) {
 // ϝϯςφϯεϞʔυ
 }
 
 return Observable.error(throwable);
 }
 }
 );

140. ΤϥʔͷछྨͰॲཧΛ෼ذ͢Δ client.getDroidKaigiContributors()
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends List<GithubContributor>>>() {
 @Override


     public Observable<? extends List<GithubContributor>> call(
 Throwable throwable) {
 if (throwable instanceof AccessTokenExpiredException) {
 // ϩάΞ΢τ
 }
 
 if (throwable instanceof MaintenanceModeException) {
 // ϝϯςφϯεϞʔυ
 }
 
 return Observable.error(throwable);
 }
 }
 );

141. ΤϥʔͷछྨͰॲཧΛ෼ذ͢Δ client.getDroidKaigiContributors()
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends List<GithubContributor>>>() {
 @Override


     public Observable<? extends List<GithubContributor>> call(
 Throwable throwable) {
 if (throwable instanceof AccessTokenExpiredException) {
 // ϩάΞ΢τ
 }
 
 if (throwable instanceof MaintenanceModeException) {
 // ϝϯςφϯεϞʔυ
 }
 
 return Observable.error(throwable);
 }
 }
 );

142. جຊฤ • ΤϥʔΛτʔετͰදࣔ͢Δ • ୅ΘΓͷσʔλΛදࣔ͢Δ • ΤϥʔͷछྨͰॲཧΛ෼ذ͢Δ • ϦτϥΠ͢Δ •

     ϦτϥΠ͢Δ͔ΛϢʔβʔʹਘͶΔ

143. ϦτϥΠ͢Δ • Ϣʔεέʔε • αʔόʔ͕ΤϥʔΛฦͨ͠৔߹ʹϦτϥΠ͢Δ • ࣮૷ํ਑ • ObservableʹΤϥʔ͕ྲྀΕͨ৔߹ʹresubscribe͢Δ •

     retry

144. ϦτϥΠ͢Δ client.getDroidKaigiContributors()
 .retry(3);

145. جຊฤ • ΤϥʔΛτʔετͰදࣔ͢Δ • ୅ΘΓͷσʔλΛදࣔ͢Δ • ΤϥʔͷछྨͰॲཧΛ෼ذ͢Δ • ϦτϥΠ͢Δ •

     ϦτϥΠ͢Δ͔ΛϢʔβʔʹਘͶΔ

146. ϦτϥΠ͢Δ͔Ͳ͏͔ΛϢʔβʔʹਘͶΔ • Ϣʔεέʔε • αʔόʔ͕ΤϥʔΛฦͨ͠৔߹ʹSnackbarΛදࣔ͠ ͯɺϦτϥΠ͢Δ͔ΛਘͶΔ • ࣮૷ํ਑ • ObservableʹΤϥʔ͕ྲྀΕͨΒSnackbarΛදࣔ͢Δ

     • Ϣʔβʔ͕ϦτϥΠΛԡͨ͠৔߹ʹresubscribe͢Δ

147. ϦτϥΠ͢Δ͔Ͳ͏͔ΛϢʔβʔʹਘͶΔ

148. ϦτϥΠ͢Δ͔ΛϢʔβʔʹਘͶΔ .retryWhen(observable -> observable.flatMap(throwable ->
 Observable.create(emitter -> {
 Snackbar snackbar

     = Snackbar.make(
 getView(), "Retry?", Snackbar.LENGTH_INDEFINITE);
 snackbar.setAction("Yes", view -> emitter.onNext(null));
 snackbar.show();
 }, Emitter.BackpressureMode.NONE))
 )

149. ϦτϥΠ͢Δ͔ΛϢʔβʔʹਘͶΔ .retryWhen(observable -> observable.flatMap(throwable ->
 Observable.create(emitter -> {
 Snackbar snackbar

     = Snackbar.make(
 getView(), "Retry?", Snackbar.LENGTH_INDEFINITE);
 snackbar.setAction("Yes", view -> emitter.onNext(null));
 snackbar.show();
 }, Emitter.BackpressureMode.NONE))
 )

150. ϦτϥΠ͢Δ͔ΛϢʔβʔʹਘͶΔ .retryWhen(observable -> observable.flatMap(throwable ->
 Observable.create(emitter -> {
 Snackbar snackbar

     = Snackbar.make(
 getView(), "Retry?", Snackbar.LENGTH_INDEFINITE);
 snackbar.setAction("Yes", view -> emitter.onNext(null));
 snackbar.show();
 }, Emitter.BackpressureMode.NONE))
 )

151. ϦτϥΠ͢Δ͔ΛϢʔβʔʹਘͶΔ .retryWhen(observable -> observable.flatMap(throwable ->
 Observable.create(emitter -> {
 Snackbar snackbar

     = Snackbar.make(
 getView(), "Retry?", Snackbar.LENGTH_INDEFINITE);
 snackbar.setAction("Yes", view -> emitter.onNext(null));
 snackbar.show();
 }, Emitter.BackpressureMode.NONE))
 )

152. ໨࣍ • RxJavaͷ͓͞Β͍ • RxJavaʹ͓͚ΔΤϥʔϋϯυϦϯά • جຊฤ • Ԡ༻ฤ •

     ࣮ફฤ • ·ͱΊ

153. Ԡ༻ฤ • جຊฤͰొ৔ͨ͠ΤϥʔϋϯυϦϯάΛ૊Έ߹ΘͤΔ • Ϣʔεέʔε1 • ϦτϥΠΛ3ճߦ͏ • μϝͳΒΩϟογϡΛදࣔ͢Δ •

     Ϣʔεέʔε2 • ϦτϥΠΛ3ճߦ͏ • μϝͳΒΩϟογϡΛදࣔ͢Δ • Ωϟογϡ͕ͳ͍৔߹͸τʔετΛදࣔ͢Δ

154. Ϣʔεέʔε1ɿϦτϥΠˍΩϟογϡ client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
 .retry(3)
 .doOnNext(new Action1<List<GithubContributor>>() {
 @Override
 public

     void call(List<GithubContributor> githubContributors) {
 dao.insertAll(githubContributors); // DBʹอଘ
 }
 })
 .onErrorReturn(new Func1<Throwable, List<GithubContributor>>() {
 @Override
 public List<GithubContributor> call(Throwable throwable) {
 return dao.findAll(); // DB͔Βऔಘ
 }
 });

155. Ϣʔεέʔε1ɿϦτϥΠˍΩϟογϡ client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
 .retry(3)
 .doOnNext(new Action1<List<GithubContributor>>() {
 @Override
 public

     void call(List<GithubContributor> githubContributors) {
 dao.insertAll(githubContributors); // DBʹอଘ
 }
 })
 .onErrorReturn(new Func1<Throwable, List<GithubContributor>>() {
 @Override
 public List<GithubContributor> call(Throwable throwable) {
 return dao.findAll(); // DB͔Βऔಘ
 }
 });

156. Ϣʔεέʔε1ɿϦτϥΠˍΩϟογϡ client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
 .retry(3)
 .doOnNext(new Action1<List<GithubContributor>>() {
 @Override
 public

     void call(List<GithubContributor> githubContributors) {
 dao.insertAll(githubContributors); // DBʹอଘ
 }
 })
 .onErrorReturn(new Func1<Throwable, List<GithubContributor>>() {
 @Override
 public List<GithubContributor> call(Throwable throwable) {
 return dao.findAll(); // DB͔Βऔಘ
 }
 });

157. Ϣʔεέʔε1ɿϦτϥΠˍΩϟογϡ client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
 .retry(3)
 .doOnNext(new Action1<List<GithubContributor>>() {
 @Override
 public

     void call(List<GithubContributor> githubContributors) {
 dao.insertAll(githubContributors); // DBʹอଘ
 }
 })
 .onErrorReturn(new Func1<Throwable, List<GithubContributor>>() {
 @Override
 public List<GithubContributor> call(Throwable throwable) {
 return dao.findAll(); // DB͔Βऔಘ
 }
 });

158. Ϣʔεέʔε1ɿϦτϥΠˍΩϟογϡ client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
 .retry(3)
 .doOnNext(new Action1<List<GithubContributor>>() {
 @Override
 public

     void call(List<GithubContributor> githubContributors) {
 dao.insertAll(githubContributors); // DBʹอଘ
 }
 })
 .onErrorReturn(new Func1<Throwable, List<GithubContributor>>() {
 @Override
 public List<GithubContributor> call(Throwable throwable) {
 return dao.findAll(); // DB͔Βऔಘ
 }
 });

159. Ϣʔεέʔε2ɿϦτϥΠˍΩϟογϡˍτʔετ client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
 .retry(3)
 .doOnNext(new Action1<List<GithubContributor>>() {
 @Override
 public

     void call(List<GithubContributor> githubContributors) {
 dao.insertAll(githubContributors); // DBʹอଘ
 }
 })
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends List<GithubContributor>>>() {
 @Override
 public Observable<? extends List<GithubContributor>> call(
 Throwable throwable) {
 if (dao.exists()) {
 return Observable.just(dao.findAll());
 }
 return Observable.error(throwable);
 }
 }
 );

160. Ϣʔεέʔε2ɿϦτϥΠˍΩϟογϡˍτʔετ client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
 .retry(3)
 .doOnNext(new Action1<List<GithubContributor>>() {
 @Override
 public

     void call(List<GithubContributor> githubContributors) {
 dao.insertAll(githubContributors); // DBʹอଘ
 }
 })
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends List<GithubContributor>>>() {
 @Override
 public Observable<? extends List<GithubContributor>> call(
 Throwable throwable) {
 if (dao.exists()) {
 return Observable.just(dao.findAll());
 }
 return Observable.error(throwable);
 }
 }
 );

161. Ϣʔεέʔε2ɿϦτϥΠˍΩϟογϡˍτʔετ client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
 .retry(3)
 .doOnNext(new Action1<List<GithubContributor>>() {
 @Override
 public

     void call(List<GithubContributor> githubContributors) {
 dao.insertAll(githubContributors); // DBʹอଘ
 }
 })
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends List<GithubContributor>>>() {
 @Override
 public Observable<? extends List<GithubContributor>> call(
 Throwable throwable) {
 if (dao.exists()) {
 return Observable.just(dao.findAll());
 }
 return Observable.error(throwable);
 }
 }
 );

162. Ϣʔεέʔε2ɿϦτϥΠˍΩϟογϡˍτʔετ client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
 .retry(3)
 .doOnNext(new Action1<List<GithubContributor>>() {
 @Override
 public

     void call(List<GithubContributor> githubContributors) {
 dao.insertAll(githubContributors); // DBʹอଘ
 }
 })
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends List<GithubContributor>>>() {
 @Override
 public Observable<? extends List<GithubContributor>> call(
 Throwable throwable) {
 if (dao.exists()) {
 return Observable.just(dao.findAll());
 }
 return Observable.error(throwable);
 }
 }
 );

163. Ϣʔεέʔε2ɿϦτϥΠˍΩϟογϡˍτʔετ client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
 .retry(3)
 .doOnNext(new Action1<List<GithubContributor>>() {
 @Override
 public

     void call(List<GithubContributor> githubContributors) {
 dao.insertAll(githubContributors); // DBʹอଘ
 }
 })
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends List<GithubContributor>>>() {
 @Override
 public Observable<? extends List<GithubContributor>> call(
 Throwable throwable) {
 if (dao.exists()) {
 return Observable.just(dao.findAll());
 }
 return Observable.error(throwable);
 }
 }
 );

164. Ϣʔεέʔε2ɿϦτϥΠˍΩϟογϡˍτʔετ client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
 .retry(3)
 .doOnNext(new Action1<List<GithubContributor>>() {
 @Override
 public

     void call(List<GithubContributor> githubContributors) {
 dao.insertAll(githubContributors); // DBʹอଘ
 }
 })
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends List<GithubContributor>>>() {
 @Override
 public Observable<? extends List<GithubContributor>> call(
 Throwable throwable) {
 if (dao.exists()) {
 return Observable.just(dao.findAll());
 }
 return Observable.error(throwable);
 }
 }
 );

165. Ϣʔεέʔε2ɿϦτϥΠˍΩϟογϡˍτʔετ client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
 .retry(3)
 .doOnNext(new Action1<List<GithubContributor>>() {
 @Override
 public

     void call(List<GithubContributor> githubContributors) {
 dao.insertAll(githubContributors); // DBʹอଘ
 }
 })
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends List<GithubContributor>>>() {
 @Override
 public Observable<? extends List<GithubContributor>> call(
 Throwable throwable) {
 if (dao.exists()) {
 return Observable.just(dao.findAll());
 }
 return Observable.error(throwable);
 }
 }
 );

166. ໨࣍ • RxJavaͷ͓͞Β͍ • RxJavaʹ͓͚ΔΤϥʔϋϯυϦϯά • جຊฤ • Ԡ༻ฤ •

     ࣮ફฤ • ·ͱΊ

167. ໨࣍ɿ࣮ફฤ • RetrofitͷΤϥʔϋϯυϦϯά

168. RetrofitͷΤϥʔϋϯυϦϯά • جຊฤͰ঺հͨ͠ʮΤϥʔͷछྨͰॲཧΛ෼ذ͢ΔʯΛ શAPIʹ࢓ࠐΈ͍ͨ client.getDroidKaigiContributors()
 .onErrorResumeNext(
 new Func1<Throwable, Observable<? extends

     List<GithubContributor>>>() {
 @Override
 public Observable<? extends List<GithubContributor>> call(
 Throwable throwable) {
 if (throwable instanceof AccessTokenExpiredException) {
 // ϩάΞ΢τ
 }
 
 if (throwable instanceof MaintenanceModeException) {
 // ϝϯςφϯεϞʔυ
 }
 
 return Observable.error(throwable);
 }
 }
 );

169. RetrofitͷΤϥʔϋϯυϦϯά • ઌͷΤϥʔॲཧΛશAPIʹ࢓ࠐΉʹ͸ • ίϐϖ • Ϋϥεʹ੾Γग़ͯ͠ɺͦΕΛશAPIʹ࢓ࠐΉ

170. RetrofitͷΤϥʔϋϯυϦϯά • ઌͷΤϥʔॲཧΛશAPIʹ࢓ࠐΉʹ͸ • ίϐϖ • Ϋϥεʹ੾Γग़ͯ͠ɺͦΕΛશAPIʹ࢓ࠐΉ • RxJavaCallAdapterFactoryͷ֦ு

171. RetrofitͷΤϥʔϋϯυϦϯά public class RxJavaErrorHandlingCallAdapterFactory extends CallAdapter.Factory {
 
 public static

     RxJavaErrorHandlingCallAdapterFactory create() {
 return new RxJavaErrorHandlingCallAdapterFactory();
 }
 
 private final CallAdapter.Factory original = RxJavaCallAdapterFactory.create();
 
 @Override
 public CallAdapter<?, ?> get(Type returnType, Annotation[] annotations, Retrofit retrofit) {
 return new RxJavaCallAdapterWrapper(original.get(returnType, annotations, retrofit));
 }
 
 private static class RxJavaCallAdapterWrapper<R>
 implements CallAdapter<R, Observable<?>> {
 private final CallAdapter<R, ?> original;
 
 public RxJavaCallAdapterWrapper(CallAdapter<R, ?> original) {
 this.original = original;
 }
 
 @Override
 public Type responseType() {
 return original.responseType();
 }
 
 @Override
 public Observable<?> adapt(Call<R> call) {
 return ((Observable<?>) original.adapt(call))
 .onErrorResumeNext(new ErrorHandler<>());
 }
 }
 }

172. RetrofitͷΤϥʔϋϯυϦϯά public class RxJavaErrorHandlingCallAdapterFactory extends CallAdapter.Factory {
 
 public static

     RxJavaErrorHandlingCallAdapterFactory create() {
 return new RxJavaErrorHandlingCallAdapterFactory();
 }
 
 private final CallAdapter.Factory original = RxJavaCallAdapterFactory.create();
 
 @Override
 public CallAdapter<?, ?> get(Type returnType, Annotation[] annotations, Retrofit retrofit) {
 return new RxJavaCallAdapterWrapper(original.get(returnType, annotations, retrofit));
 }
 
 private static class RxJavaCallAdapterWrapper<R>
 implements CallAdapter<R, Observable<?>> {
 private final CallAdapter<R, ?> original;
 
 public RxJavaCallAdapterWrapper(CallAdapter<R, ?> original) {
 this.original = original;
 }
 
 @Override
 public Type responseType() {
 return original.responseType();
 }
 
 @Override
 public Observable<?> adapt(Call<R> call) {
 return ((Observable<?>) original.adapt(call))
 .onErrorResumeNext(new ErrorHandler<>());
 }
 }
 }

173. RetrofitͷΤϥʔϋϯυϦϯά private static class RxJavaCallAdapterWrapper<R>
 implements CallAdapter<R, Observable<?>> {
 private

     final CallAdapter<R, ?> original;
 
 public RxJavaCallAdapterWrapper(CallAdapter<R, ?> original) {
 this.original = original;
 }
 
 @Override
 public Type responseType() {
 return original.responseType();
 }
 
 @Override
 public Observable<?> adapt(Call<R> call) {
 return ((Observable<?>) original.adapt(call))
 .onErrorResumeNext(new ErrorHandler<>());
 }
 }

174. RetrofitͷΤϥʔϋϯυϦϯά private static class RxJavaCallAdapterWrapper<R>
 implements CallAdapter<R, Observable<?>> {
 private

     final CallAdapter<R, ?> original;
 
 public RxJavaCallAdapterWrapper(CallAdapter<R, ?> original) {
 this.original = original;
 }
 
 @Override
 public Type responseType() {
 return original.responseType();
 }
 
 @Override
 public Observable<?> adapt(Call<R> call) {
 return ((Observable<?>) original.adapt(call))
 .onErrorResumeNext(new ErrorHandler<>());
 }
 }

175. RetrofitͷΤϥʔϋϯυϦϯά Retrofit.Builder()
 .baseUrl(BuildConfig.API_ENDPOINT)
 .client(okHttpClient)
 .addCallAdapterFactory(RxJavaErrorHandlingCallAdapterFactory.create(application))
 .addConverterFactory(GsonConverterFactory.create())
 .build()

176. RetrofitͷΤϥʔϋϯυϦϯά Retrofit.Builder()
 .baseUrl(BuildConfig.API_ENDPOINT)
 .client(okHttpClient)
 .addCallAdapterFactory(RxJavaErrorHandlingCallAdapterFactory.create(application))
 .addConverterFactory(GsonConverterFactory.create())
 .build()

177. ໨࣍ • RxJavaͷ͓͞Β͍ • RxJavaʹ͓͚ΔΤϥʔϋϯυϦϯά • جຊฤ • Ԡ༻ฤ •

     ࣮ફฤ • ·ͱΊ

178. ·ͱΊ • RxJavaʹ͓͚ΔΤϥʔϋϯυϦϯά • Catch • onError, onErrorReturn, onErrorResumeNext •

     Retry • retry, retryWhen

179. ·ͱΊ • جૅฤ • ΤϥʔΛτʔετͰදࣔ͢ΔɿonError • ୅ΘΓͷσʔλΛදࣔ͢ΔɿonErrorReturn • ΤϥʔͷछྨͰॲཧΛ෼ذ͢ΔɿonErrorResumeNext •

     ϦτϥΠ͢Δɿretry • ϦτϥΠ͢Δ͔ΛϢʔβʔʹਘͶΔɿretryWhen

180. ·ͱΊ • Ԡ༻ฤ • ϦτϥΠˍΩϟογϡɿretry, onErrorReturn • ϦτϥΠˍΩϟογϡˍτʔετɿretry, onErrorReturn, onError

181. ·ͱΊ • ࣮ફฤ • RetrofitͷΤϥʔϋϯυϦϯά • RxJavaCallAdapterFactoryͷ֦ு

182. Thank you :) Credit: NASA Earth Observatory/NOAA NGDC