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Error Handling in
RxJava
DroidKaigi 2017
yuyakaido
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ࣗݾհ
• ւ౻༏ʢ͔͍Ͳ͏Ώ͏ʣ
• AndroidΤϯδχΞ
yuyakaido
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ձࣾհ
• גࣜձࣾΤϨΧ
• ࣗࣾΞϓϦͷاըɾ։ൃɾӡӦ
• ΦϯϥΠϯσʔςΟϯά
• Χοϓϧίϛϡχέʔγϣϯ
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ຊηογϣϯͰ͓͍͑ͨ͜͠ͱ
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ຊηογϣϯͰ͓͍͑ͨ͜͠ͱ
• RxJavaͬͯOperator͕ଟͯͦ͘͠͏
• ΤϥʔϋϯυϦϯά༻ͷOperatorଟ͋͘Γ·ͤΜ
• Ϣʔεέʔε͔Βߟ͑ͯΈΔͱ͍͍͔
• RxJavaΛΘͣʹ࣮͢Δ߹ͱൺֱͨ͠ϝϦοτʁ
• OperatorΛΈ߹ΘͤΔ͜ͱͰॊೈͳΤϥʔϋϯυϦ
ϯάΛ࣮͢Δ͜ͱ͕ग़དྷ·͢
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ຊηογϣϯͰ͓͍͑ͨ͜͠ͱ
• RxJavaͬͯOperator͕ଟͯͦ͘͠͏
• ΤϥʔϋϯυϦϯά༻ͷOperatorଟ͋͘Γ·ͤΜ
• Ϣʔεέʔε͔Βߟ͑ͯΈΔͱ͍͍͔
• RxJavaΛΘͣʹ࣮͢Δ߹ͱൺֱͨ͠ϝϦοτʁ
• OperatorΛΈ߹ΘͤΔ͜ͱͰॊೈͳΤϥʔϋϯυϦ
ϯάΛ࣮͢Δ͜ͱ͕ग़དྷ·͢
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ຊηογϣϯͰ͓͍͑ͨ͜͠ͱ
• RxJavaͬͯOperator͕ଟͯͦ͘͠͏
• ΤϥʔϋϯυϦϯά༻ͷOperatorଟ͋͘Γ·ͤΜ
• Ϣʔεέʔε͔Βߟ͑ͯΈΔͱ͍͍͔
• RxJavaΛΘͣʹ࣮͢Δ߹ͱൺֱͨ͠ϝϦοτʁ
• OperatorΛΈ߹ΘͤΔ͜ͱͰॊೈͳΤϥʔϋϯυϦ
ϯάΛ࣮͢Δ͜ͱ͕ग़དྷ·͢
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࣍
• RxJavaͷ͓͞Β͍
• RxJavaʹ͓͚ΔΤϥʔϋϯυϦϯά
• جຊฤ
• Ԡ༻ฤ
• ࣮ફฤ
• ·ͱΊ
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࣍ɿجຊฤ
• αϯϓϧɿެࣜΞϓϦͷContributorΛදࣔ͢Δ
• ΤϥʔΛτʔετͰදࣔ͢Δ
• ΘΓͷσʔλΛදࣔ͢Δ
• ΤϥʔͷछྨͰॲཧΛذ͢Δ
• ϦτϥΠ͢Δ
• ϦτϥΠ͢Δ͔ΛϢʔβʔʹਘͶΔ
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࣍ɿԠ༻ฤ
• جຊฤͰొͨ͠ΤϥʔϋϯυϦϯάΛΈ߹ΘͤΔ
• Ϣʔεέʔε1
• ϦτϥΠΛ3ճߦ͏
• μϝͳΒΩϟογϡΛදࣔ͢Δ
• Ϣʔεέʔε2
• ϦτϥΠΛ3ճߦ͏
• μϝͳΒΩϟογϡΛදࣔ͢Δ
• Ωϟογϡ͕ͳ͍߹τʔετΛදࣔ͢Δ
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࣍ɿ࣮ફฤ
• RetrofitͷΤϥʔϋϯυϦϯά
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࣍
• RxJavaͷ͓͞Β͍
• RxJavaʹ͓͚ΔΤϥʔϋϯυϦϯά
• جຊฤ
• Ԡ༻ฤ
• ࣮ફฤ
• ·ͱΊ
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RxJavaͷ͓͞Β͍
• Reactive Extension for Java
• ඇಉظετϦʔϜ
• σʔλϑϩʔΛఆٛͯ͠ɺมߋΛൖͤ͞Δ
ग़యɿhttp://reactivex.io/
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࣍
• RxJavaͷ͓͞Β͍
• RxJavaʹ͓͚ΔΤϥʔϋϯυϦϯά
• جຊฤ
• Ԡ༻ฤ
• ࣮ફฤ
• ·ͱΊ
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RxJavaʹ͓͚ΔΤϥʔϋϯυϦϯά
• Catch
• Τϥʔൃੜ࣌ʹϦΧόϦʔΛߦ͏
• onError, onErrorReturn, onErrorResumeNext
• Retry
• Τϥʔൃੜ࣌ʹresubscribe͢Δ
• retry, retryWhen
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Catch
• onError
• onErrorReturn
• onErrorResumeNext
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Catch
• onError
• onErrorReturn
• onErrorResumeNext
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onError
• Τϥʔ͕Τϛοτ͞Εͨͱ͖ʹݺͼग़͞ΕΔ
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onError
Observable.create(new Action1>() {
@Override
public void call(Emitter emitter) {
emitter.onNext("onNext");
emitter.onError(new RuntimeException("Something went wrong"));
}
}, Emitter.BackpressureMode.NONE)
.subscribe(new Subscriber() {
@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);
}
});
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onError
Observable.create(new Action1>() {
@Override
public void call(Emitter emitter) {
emitter.onNext("onNext");
emitter.onError(new RuntimeException("Something went wrong"));
}
}, Emitter.BackpressureMode.NONE)
.subscribe(new Subscriber() {
@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);
}
});
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onError
Observable.create(new Action1>() {
@Override
public void call(Emitter emitter) {
emitter.onNext("onNext");
emitter.onError(new RuntimeException("Something went wrong"));
}
}, Emitter.BackpressureMode.NONE)
.subscribe(new Subscriber() {
@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);
}
});
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onError
Observable.create(new Action1>() {
@Override
public void call(Emitter emitter) {
emitter.onNext("onNext");
emitter.onError(new RuntimeException("Something went wrong"));
}
}, Emitter.BackpressureMode.NONE)
.subscribe(new Subscriber() {
@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);
}
});
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onError
Observable.create(new Action1>() {
@Override
public void call(Emitter emitter) {
emitter.onNext("onNext");
emitter.onError(new RuntimeException("Something went wrong"));
}
}, Emitter.BackpressureMode.NONE)
.subscribe(new Subscriber() {
@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);
}
});
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onError
Observable.create(new Action1>() {
@Override
public void call(Emitter emitter) {
emitter.onNext("onNext");
emitter.onError(new RuntimeException("Something went wrong"));
}
}, Emitter.BackpressureMode.NONE)
.subscribe(new Subscriber() {
@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
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onError
Observable.create(new Action1>() {
@Override
public void call(Emitter emitter) {
emitter.onNext("onNext");
emitter.onError(new RuntimeException("Something went wrong"));
}
}, Emitter.BackpressureMode.NONE)
.subscribe(new Subscriber() {
@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
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onError
Observable.create(new Action1>() {
@Override
public void call(Emitter emitter) {
emitter.onNext("onNext");
emitter.onError(new RuntimeException("Something went wrong"));
}
}, Emitter.BackpressureMode.NONE)
.subscribe(new Subscriber() {
@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
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onError
Observable.create(new Action1>() {
@Override
public void call(Emitter emitter) {
emitter.onNext("onNext");
emitter.onError(new RuntimeException("Something went wrong"));
}
}, Emitter.BackpressureMode.NONE)
.subscribe(new Subscriber() {
@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
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onError
• Τϥʔ͕Τϛοτ͞Εͨͱ͖ʹݺͼग़͞ΕΔ
• Τϥʔ༰͕Throwableͱͯ͠͞ΕΔ
• ThrowableΛͬͯΤϥʔϋϯυϦϯάΛߦ͏
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Catch
• onError
• onErrorReturn
• onErrorResumeNext
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onErrorReturn
• Τϥʔ͕Τϛοτ͞Εͨ߹ʹΘΓͷσʔλΛฦ͢
ग़యɿhttp://reactivex.io/
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onErrorReturn
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorReturn(new Func1() {
@Override
public String call(Throwable throwable) {
return "onErrorReturn";
}
})
.subscribe(new LoggingSubscriber());
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onErrorReturn
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorReturn(new Func1() {
@Override
public String call(Throwable throwable) {
return "onErrorReturn";
}
})
.subscribe(new LoggingSubscriber());
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NextThenError
public class NextThenError implements Action1> {
@Override
public void call(Emitter emitter) {
emitter.onNext("onNext");
emitter.onError(new RuntimeException("Something went wrong"));
}
}
1ͭͷΞΠςϜͱͯ͠ʮonNextʯΛΤϛοτ͢Δ
2ͭͷΞΠςϜͱͯ͠ʮRuntimeExceptionʯΛΤϛοτ͢Δ
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LoggingSubscriber
public class LoggingSubscriber extends Subscriber {
@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
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onErrorReturn
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorReturn(new Func1() {
@Override
public String call(Throwable throwable) {
return "onErrorReturn";
}
})
.subscribe(new LoggingSubscriber());
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onErrorReturn
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorReturn(new Func1() {
@Override
public String call(Throwable throwable) {
return "onErrorReturn";
}
})
.subscribe(new LoggingSubscriber());
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onErrorReturn
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorReturn(new Func1() {
@Override
public String call(Throwable throwable) {
return "onErrorReturn";
}
})
.subscribe(new LoggingSubscriber());
onErrorReturn( )
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onErrorReturn
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorReturn(new Func1() {
@Override
public String call(Throwable throwable) {
return "onErrorReturn";
}
})
.subscribe(new LoggingSubscriber());
onErrorReturn( )
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onErrorReturn
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorReturn(new Func1() {
@Override
public String call(Throwable throwable) {
return "onErrorReturn";
}
})
.subscribe(new LoggingSubscriber());
D/ErrorHandlingInRxJava: onNext
onErrorReturn( )
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onErrorReturn
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorReturn(new Func1() {
@Override
public String call(Throwable throwable) {
return "onErrorReturn";
}
})
.subscribe(new LoggingSubscriber());
D/ErrorHandlingInRxJava: onNext
onErrorReturn( )
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onErrorReturn
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorReturn(new Func1() {
@Override
public String call(Throwable throwable) {
return "onErrorReturn";
}
})
.subscribe(new LoggingSubscriber());
D/ErrorHandlingInRxJava: onNext
onErrorReturn( )
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onErrorReturn
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorReturn(new Func1() {
@Override
public String call(Throwable throwable) {
return "onErrorReturn";
}
})
.subscribe(new LoggingSubscriber());
D/ErrorHandlingInRxJava: onNext
onErrorReturn( )
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onErrorReturn
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorReturn(new Func1() {
@Override
public String call(Throwable throwable) {
return "onErrorReturn";
}
})
.subscribe(new LoggingSubscriber());
D/ErrorHandlingInRxJava: onNext
D/ErrorHandlingInRxJava: onErrorReturn
onErrorReturn( )
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onErrorReturn
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorReturn(new Func1() {
@Override
public String call(Throwable throwable) {
return "onErrorReturn";
}
})
.subscribe(new LoggingSubscriber());
D/ErrorHandlingInRxJava: onNext
D/ErrorHandlingInRxJava: onErrorReturn
D/ErrorHandlingInRxJava: onCompleted
onErrorReturn( )
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onErrorReturn
• Τϥʔ͕ൃੜͨ͠߹ʹΘΓͷσʔλΛฦ͢
• Τϥʔ༰Throwableͱͯ͠͞ΕΔ
• ThrowableΛͱʹΘΓͷσʔλΛฦ͢
• ͱͷObservableComplete͢Δ
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Catch
• onError
• onErrorReturn
• onErrorResumeNext
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onErrorResumeNext
• Τϥʔ͕Τϛοτ͞Εͨ߹ʹΘΓͷObservableΛ
ฦ͢
ग़యɿhttp://reactivex.io/
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onErrorResumeNext
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorResumeNext(
new Func1>() {
@Override
public Observable call(
Throwable throwable) {
return Observable.just("onErrorResumeNext");
}
}
)
.subscribe(new LoggingSubscriber());
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onErrorResumeNext
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorResumeNext(
new Func1>() {
@Override
public Observable call(
Throwable throwable) {
return Observable.just("onErrorResumeNext");
}
}
)
.subscribe(new LoggingSubscriber());
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onErrorResumeNext
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorResumeNext(
new Func1>() {
@Override
public Observable call(
Throwable throwable) {
return Observable.just("onErrorResumeNext");
}
}
)
.subscribe(new LoggingSubscriber());
onErrorResumeNext( )
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onErrorResumeNext
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorResumeNext(
new Func1>() {
@Override
public Observable call(
Throwable throwable) {
return Observable.just("onErrorResumeNext");
}
}
)
.subscribe(new LoggingSubscriber());
onErrorResumeNext( )
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onErrorResumeNext
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorResumeNext(
new Func1>() {
@Override
public Observable call(
Throwable throwable) {
return Observable.just("onErrorResumeNext");
}
}
)
.subscribe(new LoggingSubscriber());
D/ErrorHandlingInRxJava: onNext
onErrorResumeNext( )
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onErrorResumeNext
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorResumeNext(
new Func1>() {
@Override
public Observable call(
Throwable throwable) {
return Observable.just("onErrorResumeNext");
}
}
)
.subscribe(new LoggingSubscriber());
D/ErrorHandlingInRxJava: onNext
onErrorResumeNext( )
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onErrorResumeNext
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorResumeNext(
new Func1>() {
@Override
public Observable call(
Throwable throwable) {
return Observable.just("onErrorResumeNext");
}
}
)
.subscribe(new LoggingSubscriber());
D/ErrorHandlingInRxJava: onNext
onErrorResumeNext( )
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onErrorResumeNext
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorResumeNext(
new Func1>() {
@Override
public Observable call(
Throwable throwable) {
return Observable.just("onErrorResumeNext");
}
}
)
.subscribe(new LoggingSubscriber());
D/ErrorHandlingInRxJava: onNext
onErrorResumeNext( )
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onErrorResumeNext
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorResumeNext(
new Func1>() {
@Override
public Observable call(
Throwable throwable) {
return Observable.just("onErrorResumeNext");
}
}
)
.subscribe(new LoggingSubscriber());
D/ErrorHandlingInRxJava: onNext
D/ErrorHandlingInRxJava: onErrorResumeNext
onErrorResumeNext( )
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onErrorResumeNext
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.onErrorResumeNext(
new Func1>() {
@Override
public Observable call(
Throwable throwable) {
return Observable.just("onErrorResumeNext");
}
}
)
.subscribe(new LoggingSubscriber());
D/ErrorHandlingInRxJava: onNext
D/ErrorHandlingInRxJava: onErrorResumeNext
D/ErrorHandlingInRxJava: onCompleted
onErrorResumeNext( )
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onErrorResumeNext
• Τϥʔ͕ൃੜͨ͠߹ʹΘΓͷObservableΛฦ͢
• Τϥʔ༰Throwableͱͯ͠͞ΕΔ
• ThrowableΛͱʹΘΓͷObservableΛฦ͢
• ͱͷObservableComplete͢Δ
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Retry
• retry
• retryWhen
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Retry
• retry
• retryWhen
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retry
• Τϥʔ͕Τϛοτ͞Εͨ߹ʹresubscribe͢Δ
ग़యɿhttp://reactivex.io/
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retry
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retry(1)
.subscribe(new LoggingSubscriber());
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retry
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retry(1)
.subscribe(new LoggingSubscriber());
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retry
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retry(1)
.subscribe(new LoggingSubscriber());
retry(1)
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retry
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retry(1)
.subscribe(new LoggingSubscriber());
retry(1)
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retry
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retry(1)
.subscribe(new LoggingSubscriber());
D/ErrorHandlingInRxJava: onNext
retry(1)
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retry
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retry(1)
.subscribe(new LoggingSubscriber());
D/ErrorHandlingInRxJava: onNext
retry(1)
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retry
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retry(1)
.subscribe(new LoggingSubscriber());
D/ErrorHandlingInRxJava: onNext
retry(1)
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retry
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retry(1)
.subscribe(new LoggingSubscriber());
D/ErrorHandlingInRxJava: onNext
retry(1)
subscribe
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retry
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retry(1)
.subscribe(new LoggingSubscriber());
D/ErrorHandlingInRxJava: onNext
retry(1)
subscribe
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retry
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retry(1)
.subscribe(new LoggingSubscriber());
D/ErrorHandlingInRxJava: onNext
D/ErrorHandlingInRxJava: onNext
retry(1)
subscribe
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retry
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retry(1)
.subscribe(new LoggingSubscriber());
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retry(1)
subscribe
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retry
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retry(1)
.subscribe(new LoggingSubscriber());
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D/ErrorHandlingInRxJava: Something went wrong
retry(1)
subscribe
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retry
• Τϥʔ͕Τϛοτ͞Εͨ߹ʹresubscribe͢Δ
• Τϥʔ͕Τϛοτ͞Εͨ߹ʹଈ࠲ʹresubscribe͢Δ
• ҾͰճΛࢦఆ͢Δ͜ͱ͕ग़དྷΔ
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Retry
• retry
• retryWhen
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retryWhen
• resubscribe͢Δ݅Λࡉ੍͔͘ޚͰ͖Δ
• resubscribe͢ΔͨΊͷτϦΨʔͱͳΔObservableΛฦ͢
• τϦΨʔʹNextΛΤϛοτ͢Δͱresubscribe
• τϦΨʔʹCompleteΛΤϛοτ͢ΔͱComplete
• τϦΨʔʹErrorΛΤϛοτ͢ΔͱError
ग़యɿhttp://reactivex.io/
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retryWhen
• ϚʔϒϧμΠΞάϥϜͰߟ͑ͯΈΔ
ग़యɿhttp://reactivex.io/
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retryWhen
• Τϥʔͷ··ऴྃ͢Δ
• Τϥʔ࣌ʹComplete͢Δ
• গ࣌ؒ͠Λ͓͍ͯϦτϥΠ͢Δ
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retryWhen
• Τϥʔͷ··ऴྃ͢Δ
• Τϥʔ࣌ʹComplete͢Δ
• গ࣌ؒ͠Λ͓͍ͯϦτϥΠ͢Δ
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Τϥʔͷ··ऴྃ͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.flatMap(Observable::error)
)
.subscribe(new LoggingSubscriber());
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Τϥʔͷ··ऴྃ͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.flatMap(Observable::error)
)
.subscribe(new LoggingSubscriber());
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Τϥʔͷ··ऴྃ͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.flatMap(Observable::error)
)
.subscribe(new LoggingSubscriber());
retryWhen ( )
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Τϥʔͷ··ऴྃ͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.flatMap(Observable::error)
)
.subscribe(new LoggingSubscriber());
retryWhen ( )
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Τϥʔͷ··ऴྃ͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.flatMap(Observable::error)
)
.subscribe(new LoggingSubscriber());
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retryWhen ( )
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Τϥʔͷ··ऴྃ͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.flatMap(Observable::error)
)
.subscribe(new LoggingSubscriber());
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retryWhen ( )
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Τϥʔͷ··ऴྃ͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.flatMap(Observable::error)
)
.subscribe(new LoggingSubscriber());
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retryWhen ( )
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Τϥʔͷ··ऴྃ͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.flatMap(Observable::error)
)
.subscribe(new LoggingSubscriber());
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retryWhen ( )
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Τϥʔͷ··ऴྃ͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.flatMap(Observable::error)
)
.subscribe(new LoggingSubscriber());
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D/ErrorHandlingInRxJava: Something went wrong
retryWhen ( )
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retryWhen
• Τϥʔͷ··ऴྃ͢Δ
• Τϥʔ࣌ʹComplete͢Δ
• গ࣌ؒ͠Λ͓͍ͯϦτϥΠ͢Δ
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Τϥʔ࣌ʹComplete͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.first().ignoreElements()
)
.subscribe(new LoggingSubscriber());
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Τϥʔ࣌ʹComplete͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.first().ignoreElements()
)
.subscribe(new LoggingSubscriber());
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Τϥʔ࣌ʹComplete͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.first().ignoreElements()
)
.subscribe(new LoggingSubscriber());
retryWhen ( )
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Τϥʔ࣌ʹComplete͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.first().ignoreElements()
)
.subscribe(new LoggingSubscriber());
retryWhen ( )
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Τϥʔ࣌ʹComplete͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.first().ignoreElements()
)
.subscribe(new LoggingSubscriber());
retryWhen ( )
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Τϥʔ࣌ʹComplete͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.first().ignoreElements()
)
.subscribe(new LoggingSubscriber());
retryWhen ( )
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Τϥʔ࣌ʹComplete͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.first().ignoreElements()
)
.subscribe(new LoggingSubscriber());
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retryWhen ( )
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Τϥʔ࣌ʹComplete͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.first().ignoreElements()
)
.subscribe(new LoggingSubscriber());
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retryWhen ( )
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Τϥʔ࣌ʹComplete͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.first().ignoreElements()
)
.subscribe(new LoggingSubscriber());
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retryWhen ( )
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Τϥʔ࣌ʹComplete͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.first().ignoreElements()
)
.subscribe(new LoggingSubscriber());
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retryWhen ( )
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Τϥʔ࣌ʹComplete͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.first().ignoreElements()
)
.subscribe(new LoggingSubscriber());
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retryWhen ( )
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࣌ؒΛ͓͍ͯϦτϥΠ͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.first().flatMap(throwable ->
Observable.timer(3, TimeUnit.SECONDS)
)
)
.subscribe(new LoggingSubscriber());
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࣌ؒΛ͓͍ͯϦτϥΠ͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.first().flatMap(throwable ->
Observable.timer(3, TimeUnit.SECONDS)
)
)
.subscribe(new LoggingSubscriber());
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࣌ؒΛ͓͍ͯϦτϥΠ͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.first().flatMap(throwable ->
Observable.timer(3, TimeUnit.SECONDS)
)
)
.subscribe(new LoggingSubscriber());
retryWhen ( )
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࣌ؒΛ͓͍ͯϦτϥΠ͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.first().flatMap(throwable ->
Observable.timer(3, TimeUnit.SECONDS)
)
)
.subscribe(new LoggingSubscriber());
retryWhen ( )
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࣌ؒΛ͓͍ͯϦτϥΠ͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.first().flatMap(throwable ->
Observable.timer(3, TimeUnit.SECONDS)
)
)
.subscribe(new LoggingSubscriber());
retryWhen ( )
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࣌ؒΛ͓͍ͯϦτϥΠ͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.first().flatMap(throwable ->
Observable.timer(3, TimeUnit.SECONDS)
)
)
.subscribe(new LoggingSubscriber());
retryWhen ( )
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࣌ؒ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 ( )
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࣌ؒ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 ( )
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࣌ؒ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 ( )
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࣌ؒΛ͓͍ͯϦτϥΠ͢Δ
Observable.create(new NextThenError(), Emitter.BackpressureMode.NONE)
.retryWhen(observable ->
observable.first().flatMap(throwable ->
Observable.timer(3, TimeUnit.SECONDS)
)
)
.subscribe(new LoggingSubscriber());
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retryWhen ( )
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࣌ؒ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
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࣌ؒ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
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࣌ؒ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
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࣌ؒ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
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࣌ؒ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
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࣌ؒ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
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࣍
• RxJavaͷ͓͞Β͍
• RxJavaʹ͓͚ΔΤϥʔϋϯυϦϯά
• جຊฤ
• Ԡ༻ฤ
• ࣮ફฤ
• ·ͱΊ
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جຊฤ
• ΤϥʔΛτʔετͰදࣔ͢Δ
• ΘΓͷσʔλΛදࣔ͢Δ
• ΤϥʔͷछྨͰॲཧΛذ͢Δ
• ϦτϥΠ͢Δ
• ϦτϥΠ͢Δ͔ΛϢʔβʔʹਘͶΔ
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جຊฤ
• ΤϥʔΛτʔετͰදࣔ͢Δ
• ΘΓͷσʔλΛදࣔ͢Δ
• ΤϥʔͷछྨͰॲཧΛذ͢Δ
• ϦτϥΠ͢Δ
• ϦτϥΠ͢Δ͔ΛϢʔβʔʹਘͶΔ
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ΤϥʔΛτʔετͰදࣔ͢Δ
• Ϣʔεέʔε
• ΤϥʔϝοηʔδΛදࣔ͢Δ
• ࣮ํ
• ObservableʹྲྀΕͨΤϥʔΛΩϟον͢Δ
• onError
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ΤϥʔΛτʔετͰදࣔ͢Δ
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ΤϥʔΛτʔετͰදࣔ͢Δ
githubRepository.getDroidKaigiContributors()
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Subscriber>() {
@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 githubContributors) {
// Write your awesome logic
}
});
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ΤϥʔΛτʔετͰදࣔ͢Δ
githubRepository.getDroidKaigiContributors()
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Subscriber>() {
@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 githubContributors) {
// Write your awesome logic
}
});
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ΤϥʔΛτʔετͰදࣔ͢Δ
githubRepository.getDroidKaigiContributors()
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Subscriber>() {
@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 githubContributors) {
// Write your awesome logic
}
});
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ΤϥʔΛτʔετͰදࣔ͢Δ
githubRepository.getDroidKaigiContributors()
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Subscriber>() {
@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 githubContributors) {
// Write your awesome logic
}
});
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ΤϥʔΛτʔετͰදࣔ͢Δ
githubRepository.getDroidKaigiContributors()
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Subscriber>() {
@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 githubContributors) {
// Write your awesome logic
}
});
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جຊฤ
• ΤϥʔΛτʔετͰදࣔ͢Δ
• ΘΓͷσʔλΛදࣔ͢Δ
• ΤϥʔͷछྨͰॲཧΛذ͢Δ
• ϦτϥΠ͢Δ
• ϦτϥΠ͢Δ͔ΛϢʔβʔʹਘͶΔ
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ΘΓͷσʔλΛදࣔ͢Δ
• Ϣʔεέʔε
• αʔόʔ͔Βσʔλ͕औಘͰ͖ͳ͔ͬͨ߹ʹɺΩϟο
γϡ͍ͯ͠ΔσʔλΛදࣔ͢Δ
• ࣮ํ
• ObservableʹྲྀΕͨΤϥʔΛΩϟον͢Δ
• ΘΓʹΩϟογϡ͔ΒऔΓग़ͨ͠σʔλΛྲྀ͢
• onErrorReturn
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ΘΓͷσʔλΛදࣔ͢Δ
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ΘΓͷσʔλΛදࣔ͢Δ
client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
.doOnNext(new Action1>() {
@Override
public void call(List githubContributors) {
dao.insertAll(githubContributors); // DBʹอଘ
}
})
.onErrorReturn(new Func1>() {
@Override
public List call(Throwable throwable) {
return dao.findAll(); // DB͔Βऔಘ
}
});
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ΘΓͷσʔλΛදࣔ͢Δ
client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
.doOnNext(new Action1>() {
@Override
public void call(List githubContributors) {
dao.insertAll(githubContributors); // DBʹอଘ
}
})
.onErrorReturn(new Func1>() {
@Override
public List call(Throwable throwable) {
return dao.findAll(); // DB͔Βऔಘ
}
});
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ΘΓͷσʔλΛදࣔ͢Δ
client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
.doOnNext(new Action1>() {
@Override
public void call(List githubContributors) {
dao.insertAll(githubContributors); // DBʹอଘ
}
})
.onErrorReturn(new Func1>() {
@Override
public List call(Throwable throwable) {
return dao.findAll(); // DB͔Βऔಘ
}
});
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ΘΓͷσʔλΛදࣔ͢Δ
client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
.doOnNext(new Action1>() {
@Override
public void call(List githubContributors) {
dao.insertAll(githubContributors); // DBʹอଘ
}
})
.onErrorReturn(new Func1>() {
@Override
public List call(Throwable throwable) {
return dao.findAll(); // DB͔Βऔಘ
}
});
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جຊฤ
• ΤϥʔΛτʔετͰදࣔ͢Δ
• ΘΓͷσʔλΛදࣔ͢Δ
• ΤϥʔͷछྨͰॲཧΛذ͢Δ
• ϦτϥΠ͢Δ
• ϦτϥΠ͢Δ͔ΛϢʔβʔʹਘͶΔ
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ΤϥʔͷछྨͰॲཧΛذ͢Δ
• Ϣʔεέʔε
• αʔόʔ͕ฦͨ͠ΤϥʔίʔυʹΑͬͯॲཧΛذ͢
Δ
• ࣮ํ
• ObservableʹྲྀΕͨΤϥʔΛΩϟον͢Δ
• ΤϥʔͷछྨΛͱʹॲཧΛذ͢Δ
• onErrorResumeNext
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ΤϥʔͷछྨͰॲཧΛذ͢Δ
client.getDroidKaigiContributors()
.onErrorResumeNext(
new Func1>>() {
@Override
public Observable> call(
Throwable throwable) {
if (throwable instanceof AccessTokenExpiredException) {
// ϩάΞτ
}
if (throwable instanceof MaintenanceModeException) {
// ϝϯςφϯεϞʔυ
}
return Observable.error(throwable);
}
}
);
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ΤϥʔͷछྨͰॲཧΛذ͢Δ
client.getDroidKaigiContributors()
.onErrorResumeNext(
new Func1>>() {
@Override
public Observable> call(
Throwable throwable) {
if (throwable instanceof AccessTokenExpiredException) {
// ϩάΞτ
}
if (throwable instanceof MaintenanceModeException) {
// ϝϯςφϯεϞʔυ
}
return Observable.error(throwable);
}
}
);
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ΤϥʔͷछྨͰॲཧΛذ͢Δ
client.getDroidKaigiContributors()
.onErrorResumeNext(
new Func1>>() {
@Override
public Observable> call(
Throwable throwable) {
if (throwable instanceof AccessTokenExpiredException) {
// ϩάΞτ
}
if (throwable instanceof MaintenanceModeException) {
// ϝϯςφϯεϞʔυ
}
return Observable.error(throwable);
}
}
);
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ΤϥʔͷछྨͰॲཧΛذ͢Δ
client.getDroidKaigiContributors()
.onErrorResumeNext(
new Func1>>() {
@Override
public Observable> call(
Throwable throwable) {
if (throwable instanceof AccessTokenExpiredException) {
// ϩάΞτ
}
if (throwable instanceof MaintenanceModeException) {
// ϝϯςφϯεϞʔυ
}
return Observable.error(throwable);
}
}
);
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ΤϥʔͷछྨͰॲཧΛذ͢Δ
client.getDroidKaigiContributors()
.onErrorResumeNext(
new Func1>>() {
@Override
public Observable> call(
Throwable throwable) {
if (throwable instanceof AccessTokenExpiredException) {
// ϩάΞτ
}
if (throwable instanceof MaintenanceModeException) {
// ϝϯςφϯεϞʔυ
}
return Observable.error(throwable);
}
}
);
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ΤϥʔͷछྨͰॲཧΛذ͢Δ
client.getDroidKaigiContributors()
.onErrorResumeNext(
new Func1>>() {
@Override
public Observable> call(
Throwable throwable) {
if (throwable instanceof AccessTokenExpiredException) {
// ϩάΞτ
}
if (throwable instanceof MaintenanceModeException) {
// ϝϯςφϯεϞʔυ
}
return Observable.error(throwable);
}
}
);
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جຊฤ
• ΤϥʔΛτʔετͰදࣔ͢Δ
• ΘΓͷσʔλΛදࣔ͢Δ
• ΤϥʔͷछྨͰॲཧΛذ͢Δ
• ϦτϥΠ͢Δ
• ϦτϥΠ͢Δ͔ΛϢʔβʔʹਘͶΔ
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ϦτϥΠ͢Δ
• Ϣʔεέʔε
• αʔόʔ͕ΤϥʔΛฦͨ͠߹ʹϦτϥΠ͢Δ
• ࣮ํ
• ObservableʹΤϥʔ͕ྲྀΕͨ߹ʹresubscribe͢Δ
• retry
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ϦτϥΠ͢Δ
client.getDroidKaigiContributors()
.retry(3);
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جຊฤ
• ΤϥʔΛτʔετͰදࣔ͢Δ
• ΘΓͷσʔλΛදࣔ͢Δ
• ΤϥʔͷछྨͰॲཧΛذ͢Δ
• ϦτϥΠ͢Δ
• ϦτϥΠ͢Δ͔ΛϢʔβʔʹਘͶΔ
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ϦτϥΠ͢Δ͔Ͳ͏͔ΛϢʔβʔʹਘͶΔ
• Ϣʔεέʔε
• αʔόʔ͕ΤϥʔΛฦͨ͠߹ʹSnackbarΛදࣔ͠
ͯɺϦτϥΠ͢Δ͔ΛਘͶΔ
• ࣮ํ
• ObservableʹΤϥʔ͕ྲྀΕͨΒSnackbarΛදࣔ͢Δ
• Ϣʔβʔ͕ϦτϥΠΛԡͨ͠߹ʹresubscribe͢Δ
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ϦτϥΠ͢Δ͔Ͳ͏͔ΛϢʔβʔʹਘͶΔ
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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))
)
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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))
)
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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))
)
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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))
)
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࣍
• RxJavaͷ͓͞Β͍
• RxJavaʹ͓͚ΔΤϥʔϋϯυϦϯά
• جຊฤ
• Ԡ༻ฤ
• ࣮ફฤ
• ·ͱΊ
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Ԡ༻ฤ
• جຊฤͰొͨ͠ΤϥʔϋϯυϦϯάΛΈ߹ΘͤΔ
• Ϣʔεέʔε1
• ϦτϥΠΛ3ճߦ͏
• μϝͳΒΩϟογϡΛදࣔ͢Δ
• Ϣʔεέʔε2
• ϦτϥΠΛ3ճߦ͏
• μϝͳΒΩϟογϡΛදࣔ͢Δ
• Ωϟογϡ͕ͳ͍߹τʔετΛදࣔ͢Δ
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Ϣʔεέʔε1ɿϦτϥΠˍΩϟογϡ
client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
.retry(3)
.doOnNext(new Action1>() {
@Override
public void call(List githubContributors) {
dao.insertAll(githubContributors); // DBʹอଘ
}
})
.onErrorReturn(new Func1>() {
@Override
public List call(Throwable throwable) {
return dao.findAll(); // DB͔Βऔಘ
}
});
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Ϣʔεέʔε1ɿϦτϥΠˍΩϟογϡ
client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
.retry(3)
.doOnNext(new Action1>() {
@Override
public void call(List githubContributors) {
dao.insertAll(githubContributors); // DBʹอଘ
}
})
.onErrorReturn(new Func1>() {
@Override
public List call(Throwable throwable) {
return dao.findAll(); // DB͔Βऔಘ
}
});
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Ϣʔεέʔε1ɿϦτϥΠˍΩϟογϡ
client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
.retry(3)
.doOnNext(new Action1>() {
@Override
public void call(List githubContributors) {
dao.insertAll(githubContributors); // DBʹอଘ
}
})
.onErrorReturn(new Func1>() {
@Override
public List call(Throwable throwable) {
return dao.findAll(); // DB͔Βऔಘ
}
});
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Ϣʔεέʔε1ɿϦτϥΠˍΩϟογϡ
client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
.retry(3)
.doOnNext(new Action1>() {
@Override
public void call(List githubContributors) {
dao.insertAll(githubContributors); // DBʹอଘ
}
})
.onErrorReturn(new Func1>() {
@Override
public List call(Throwable throwable) {
return dao.findAll(); // DB͔Βऔಘ
}
});
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Ϣʔεέʔε1ɿϦτϥΠˍΩϟογϡ
client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
.retry(3)
.doOnNext(new Action1>() {
@Override
public void call(List githubContributors) {
dao.insertAll(githubContributors); // DBʹอଘ
}
})
.onErrorReturn(new Func1>() {
@Override
public List call(Throwable throwable) {
return dao.findAll(); // DB͔Βऔಘ
}
});
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Ϣʔεέʔε2ɿϦτϥΠˍΩϟογϡˍτʔετ
client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
.retry(3)
.doOnNext(new Action1>() {
@Override
public void call(List githubContributors) {
dao.insertAll(githubContributors); // DBʹอଘ
}
})
.onErrorResumeNext(
new Func1>>() {
@Override
public Observable> call(
Throwable throwable) {
if (dao.exists()) {
return Observable.just(dao.findAll());
}
return Observable.error(throwable);
}
}
);
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Ϣʔεέʔε2ɿϦτϥΠˍΩϟογϡˍτʔετ
client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
.retry(3)
.doOnNext(new Action1>() {
@Override
public void call(List githubContributors) {
dao.insertAll(githubContributors); // DBʹอଘ
}
})
.onErrorResumeNext(
new Func1>>() {
@Override
public Observable> call(
Throwable throwable) {
if (dao.exists()) {
return Observable.just(dao.findAll());
}
return Observable.error(throwable);
}
}
);
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Ϣʔεέʔε2ɿϦτϥΠˍΩϟογϡˍτʔετ
client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
.retry(3)
.doOnNext(new Action1>() {
@Override
public void call(List githubContributors) {
dao.insertAll(githubContributors); // DBʹอଘ
}
})
.onErrorResumeNext(
new Func1>>() {
@Override
public Observable> call(
Throwable throwable) {
if (dao.exists()) {
return Observable.just(dao.findAll());
}
return Observable.error(throwable);
}
}
);
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Ϣʔεέʔε2ɿϦτϥΠˍΩϟογϡˍτʔετ
client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
.retry(3)
.doOnNext(new Action1>() {
@Override
public void call(List githubContributors) {
dao.insertAll(githubContributors); // DBʹอଘ
}
})
.onErrorResumeNext(
new Func1>>() {
@Override
public Observable> call(
Throwable throwable) {
if (dao.exists()) {
return Observable.just(dao.findAll());
}
return Observable.error(throwable);
}
}
);
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Ϣʔεέʔε2ɿϦτϥΠˍΩϟογϡˍτʔετ
client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
.retry(3)
.doOnNext(new Action1>() {
@Override
public void call(List githubContributors) {
dao.insertAll(githubContributors); // DBʹอଘ
}
})
.onErrorResumeNext(
new Func1>>() {
@Override
public Observable> call(
Throwable throwable) {
if (dao.exists()) {
return Observable.just(dao.findAll());
}
return Observable.error(throwable);
}
}
);
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Ϣʔεέʔε2ɿϦτϥΠˍΩϟογϡˍτʔετ
client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
.retry(3)
.doOnNext(new Action1>() {
@Override
public void call(List githubContributors) {
dao.insertAll(githubContributors); // DBʹอଘ
}
})
.onErrorResumeNext(
new Func1>>() {
@Override
public Observable> call(
Throwable throwable) {
if (dao.exists()) {
return Observable.just(dao.findAll());
}
return Observable.error(throwable);
}
}
);
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Ϣʔεέʔε2ɿϦτϥΠˍΩϟογϡˍτʔετ
client.getDroidKaigiContributors() // αʔόʔ͔Βऔಘ
.retry(3)
.doOnNext(new Action1>() {
@Override
public void call(List githubContributors) {
dao.insertAll(githubContributors); // DBʹอଘ
}
})
.onErrorResumeNext(
new Func1>>() {
@Override
public Observable> call(
Throwable throwable) {
if (dao.exists()) {
return Observable.just(dao.findAll());
}
return Observable.error(throwable);
}
}
);
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࣍
• RxJavaͷ͓͞Β͍
• RxJavaʹ͓͚ΔΤϥʔϋϯυϦϯά
• جຊฤ
• Ԡ༻ฤ
• ࣮ફฤ
• ·ͱΊ
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࣍ɿ࣮ફฤ
• RetrofitͷΤϥʔϋϯυϦϯά
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RetrofitͷΤϥʔϋϯυϦϯά
• جຊฤͰհͨ͠ʮΤϥʔͷछྨͰॲཧΛذ͢ΔʯΛ
શAPIʹࠐΈ͍ͨ
client.getDroidKaigiContributors()
.onErrorResumeNext(
new Func1>>() {
@Override
public Observable> call(
Throwable throwable) {
if (throwable instanceof AccessTokenExpiredException) {
// ϩάΞτ
}
if (throwable instanceof MaintenanceModeException) {
// ϝϯςφϯεϞʔυ
}
return Observable.error(throwable);
}
}
);
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RetrofitͷΤϥʔϋϯυϦϯά
• ઌͷΤϥʔॲཧΛશAPIʹࠐΉʹ
• ίϐϖ
• ΫϥεʹΓग़ͯ͠ɺͦΕΛશAPIʹࠐΉ
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RetrofitͷΤϥʔϋϯυϦϯά
• ઌͷΤϥʔॲཧΛશAPIʹࠐΉʹ
• ίϐϖ
• ΫϥεʹΓग़ͯ͠ɺͦΕΛશAPIʹࠐΉ
• RxJavaCallAdapterFactoryͷ֦ு
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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
implements CallAdapter> {
private final CallAdapter original;
public RxJavaCallAdapterWrapper(CallAdapter original) {
this.original = original;
}
@Override
public Type responseType() {
return original.responseType();
}
@Override
public Observable adapt(Call call) {
return ((Observable) original.adapt(call))
.onErrorResumeNext(new ErrorHandler<>());
}
}
}
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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
implements CallAdapter> {
private final CallAdapter original;
public RxJavaCallAdapterWrapper(CallAdapter original) {
this.original = original;
}
@Override
public Type responseType() {
return original.responseType();
}
@Override
public Observable adapt(Call call) {
return ((Observable) original.adapt(call))
.onErrorResumeNext(new ErrorHandler<>());
}
}
}
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RetrofitͷΤϥʔϋϯυϦϯά
private static class RxJavaCallAdapterWrapper
implements CallAdapter> {
private final CallAdapter original;
public RxJavaCallAdapterWrapper(CallAdapter original) {
this.original = original;
}
@Override
public Type responseType() {
return original.responseType();
}
@Override
public Observable adapt(Call call) {
return ((Observable) original.adapt(call))
.onErrorResumeNext(new ErrorHandler<>());
}
}
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RetrofitͷΤϥʔϋϯυϦϯά
private static class RxJavaCallAdapterWrapper
implements CallAdapter> {
private final CallAdapter original;
public RxJavaCallAdapterWrapper(CallAdapter original) {
this.original = original;
}
@Override
public Type responseType() {
return original.responseType();
}
@Override
public Observable adapt(Call call) {
return ((Observable) original.adapt(call))
.onErrorResumeNext(new ErrorHandler<>());
}
}
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RetrofitͷΤϥʔϋϯυϦϯά
Retrofit.Builder()
.baseUrl(BuildConfig.API_ENDPOINT)
.client(okHttpClient)
.addCallAdapterFactory(RxJavaErrorHandlingCallAdapterFactory.create(application))
.addConverterFactory(GsonConverterFactory.create())
.build()
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RetrofitͷΤϥʔϋϯυϦϯά
Retrofit.Builder()
.baseUrl(BuildConfig.API_ENDPOINT)
.client(okHttpClient)
.addCallAdapterFactory(RxJavaErrorHandlingCallAdapterFactory.create(application))
.addConverterFactory(GsonConverterFactory.create())
.build()
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࣍
• RxJavaͷ͓͞Β͍
• RxJavaʹ͓͚ΔΤϥʔϋϯυϦϯά
• جຊฤ
• Ԡ༻ฤ
• ࣮ફฤ
• ·ͱΊ
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·ͱΊ
• RxJavaʹ͓͚ΔΤϥʔϋϯυϦϯά
• Catch
• onError, onErrorReturn, onErrorResumeNext
• Retry
• retry, retryWhen
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·ͱΊ
• جૅฤ
• ΤϥʔΛτʔετͰදࣔ͢ΔɿonError
• ΘΓͷσʔλΛදࣔ͢ΔɿonErrorReturn
• ΤϥʔͷछྨͰॲཧΛذ͢ΔɿonErrorResumeNext
• ϦτϥΠ͢Δɿretry
• ϦτϥΠ͢Δ͔ΛϢʔβʔʹਘͶΔɿretryWhen
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·ͱΊ
• Ԡ༻ฤ
• ϦτϥΠˍΩϟογϡɿretry, onErrorReturn
• ϦτϥΠˍΩϟογϡˍτʔετɿretry,
onErrorReturn, onError
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·ͱΊ
• ࣮ફฤ
• RetrofitͷΤϥʔϋϯυϦϯά
• RxJavaCallAdapterFactoryͷ֦ு
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Thank you :)
Credit: NASA Earth Observatory/NOAA NGDC