droidkaigi-2017

Transcript

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