Androidアプリ開発からみた RxJavaの使いどころ

Transcript

1. "OESPJEΞϓϦ։ൃ͔ΒΈͨ
   3Y+BWBͷ࢖͍Ͳ͜Ζ 
   ++6(
   $$$
   
   4QSJOH
   
   /BPLJ
   .PSJPLB

2. ΤϯδχΞྺ
   ೥໨
   
   
   
   $ݴޠΛ೥΄Ͳɺޙ͸΄ͱΜͲ+BWB
   
   
   
   ࠷ۙ͸"OEPSJEJ04
   ΞϓϦ։ൃ ੝Ԭ
   ঘه
   !O@NPSJPLB
   IUUQTHJUIVCDPNONPSJPLB "CPVU
   .F ϑϦϡʔגࣜձࣾۈ຿
   ژ౎ࡏॅ

3. ࢲͷ3Y+BWB΁ͷϞνϕʔγϣϯ w ؔ਺ܕzతzͳॲཧͷѻ͍͕Մೳ
   
   খ͍͞ॲཧΛ૊Έ߹Θͤͯେ͖ͳॲཧΛهड़͍ͯ͘͠
   
   +BWBͰهड़ग़དྷͯ΄Ͳྑ͍όϥϯεײ֮
   w ࢖ͬͯΈΔͱ৭ʑͱ৽͍͠ൃݟ͕͋Δ
   
   qBU.BQ
   
   [JQ
   
   DPNCJOF-BUFTU
   ͳͲͷར༻

4. ར༻͍ͯ͠Δόʔδϣϯ w +%,
   
   @
   w 3Y+BWB
   
   
   w 4QSJOH
   #PPU
   #6*-%4/"14)05
   w 3FBDUPSɿ#6*-%4/"14)05

5. ΞδΣϯμ w 3Y+BWBͷ֓ཁ
   w 3Y+BWBͷجຊ
   w "OESPJEΞϓϦͰͷར༻ʹ͍ͭͯ
   w αʔόαΠυͰͷར༻ʹ͍ͭͯ
   w

   ·ͱΊ

6. w +BWB
   7.্Ͱಈ࡞͢Δ؍ଌՄೳ 0CTFSWBCMF ͳ࣌ܥྻσʔλ Λ༻͍ͨɺඇಉظͳΠϕϯτϕʔεͷϓϩάϥϛϯά ϦΞΫςΟ ϒϓϩάϥϛϯά ΛՄೳʹ͢ΔϥΠϒϥϦ
   w +BWBҎ্Ͱར༻Մೳ
   

   w ݱঢ়ͷϝΠϯ͸
   3Y+BWB
   ܥ
   w 3Y+BWB
   
   
   3FBDUJWF
   &YUFOTJPOT
   
   3FBDUJWF
   4USFBNT 8IBU`T
   3Y+BWBʁ

7. ϦΞΫςΟϒϓϩάϥϛϯάᶃ w ͋ΔσʔλετϦʔϜʹରͯ͠ ͍ͭ͘Δ͔Θ͔Βͳ͍ σʔ λʹ൓ԠతʹϓϩάϥϛϯάΛߦ͏͜ͱ σʔλ ࣌ܥྻʹԊͬͨ
   ྲྀΕ
   
   ετϦʔϜ
   σʔλ ʜ

8. ϦΞΫςΟϒϓϩάϥϛϯάᶄ w 3Y+BWBʹ͓͍ͯ͸+BWBΠϯελϯεͷ͕ͭͭσʔλ 4USFBN
   "1*ͱಉ͡ " # $ 4USJOHσʔλ " "

   " # $ # # $ $ # $ " # $ " # $ -JTUσʔλ

9. ϦΞΫςΟϒϓϩάϥϛϯάᶅ w σʔλετϦʔϜͷੜ੒΍ɺม׵ɺ߹੒Λߦ͏
   w ετϦʔϜ͔ΒདྷΔσʔλΛड͚औͬͨॲཧ ߪಡ Λهࡌ͢Δ " # $

   Πϕϯτ " " Πϕϯτ ʜ B C D B B 4USJOH ͂
   
   
   
   TUP-PXFS$BTF ม׵ 4ZTUFNPVUQSJOUMO ߪಡ B
   C
   D
   ʜ

10. w ϚΠΫϩιϑτࣾʹΑͬͯఏএ͞Εͨɺෳࡶͳඇಉظॲཧ΍Πϕ ϯτॲཧɺ͕࣌ؒؔ܎͢ΔॲཧͳͲΛهड़Ͱ͖Δ"1*܊ͷ࢓༷
    w /&5΍+4ͳͲ֤छ࣮૷͕͋Δ
    w େ͖͍࢓༷ 3FBDUJWF
    &YUFOTJPOT 3Y IUUQTHJUIVCDPN3FBDUJWF&YUFOTJPOT

11. w ϊϯϒϩοΩϯάͳ#BDL
    1SFTTVSFΛ༻͍ͨඇಉظετϦʔϜॲཧͷ࢓༷
    w ͭͷΠϯλʔϑΣʔεఆٛͷఏڙ
    
    1VCMJTIFS
    
    
    
    
    
    4VCTDSJCFS
    
    
    
    
    4VCTDSJQUJPO
    
    
    1SPDFTTPS
    
    w 5FTU
    4VJUFͷఏڙ

    5$,
    w খ͍͞࢓༷ 3FBDUJWF
    4USFBNT

12. 3FBDUJWF
    4USFBNT
    ΠϯλʔϑΣʔε Publisher public void subscribe(Subscriber<? super T> s); Subscriber public

    void onSubscribe(Subscription s); public void onNext(T t); public void onError(Throwable t); public void onComplete(); /
    EBUB
    SFRVFTU /
    EBUB
    TUSFBNJOH TVCTDSJCF Subscription public void request(long n); public void cancel(); 1VCMJTIFS͕σʔλΛྲྀ͠4VCTDSJCFS͕σʔλΛड͚औΔॲཧ͕جຊ Processor public interface Processor<T, R> extends Subscriber<T>, Publisher<R> { }

13. #BDL
    1SFTTVSF w ड৴ଆ͔Βૹ৴ଆ΁ͷσʔλϑϩʔ੍ޚ
    w ॲཧ͕ऴΘͬͨ͜ͱΛ఻͑ͯ࣍ͷσʔλΛऔಘ͢Δ
    w ૹ৴ଆͷσʔλੜ੒ͷํ͕଎͍৔߹͸4USBUFHZʹैͬͨॲཧ࣮ࢪ
    w ࿈݁΍߹੒΋Մೳ ॲཧ͖ͬͨ͠ͷͰ࣍Լ͍͞

    data 0, #BDL1SFTTVSF
    4USBUFHZ #6''&3 %301 -"5&45 &3303 /0/& Publisher Subscriber

14. ΞδΣϯμ w 3Y+BWBͷ֓ཁ
    w 3Y+BWBͷجຊ
    w "OESPJEΞϓϦͰͷར༻ʹ͍ͭͯ
    w αʔόαΠυͰͷར༻ʹ͍ͭͯ
    w

    ·ͱΊ

15. 3Y+BWBͷίΞ
    'MPXBCMF
    
    0CTFSWBCMF

16. 'MPXBCMF0CTFSWBCMFͱ͸Կ͔ʁ w σʔλͷετϦʔϜΛੜ࢈ͯ͠ɺอ࣋͢ΔೖΕ෺ͷΑ͏ͳ΋ͷɻ ߪಡ TVCTDSJCF Մೳ
    
    'MPXBCMF͸1VCMJTIFSΛ࣮૷ɺ#BDL
    1SFTTVSF੍ޚ͋Γɹ
    
    0CTFSWBCMF͸#BDL
    1SFTTVSF੍ޚͳ͠ɻύϑΥʔϚϯε͸ྑ͍
    w ͭͷঢ়ଶΛߪಡऀʹ఻͑Δɹ
    

    
    4VCTDSJCF
    
    /FYU
    
    $PNQMFUF
    
    &SSPS
    w ͭͷੑ࣭Λ࣋ͭ
    
    )PU
    
    $PME

17. ̐ͭͷঢ়ଶ w 4VCTDSJCF͸௨஌ͷ४උ͕ग़དྷͨঢ়ଶ
    w /FYU͸σʔλ͕ྲྀΕ͍ͯΔঢ়ଶɻσʔλ಺༰͕ϋϯυϦϯά͞ΕΔ
    w $PNQMFUF͸ਖ਼ৗऴྃɻετϦʔϜʹσʔλ͕ྲྀΕͳ͘ͳΔ
    w &SSPS͸ҟৗऴྃɻετϦʔϜʹσʔλ͸ྲྀΕͳ͘ͳΔ
    OFYU

    OFYU OFYU OFYU OFYU DPNQMFUF OFYU OFYU FSSPS TVCTDSJCF TVCTDSJCF

18. ߪಡॲཧ Flowable.just("1", "2", "3", "4") .subscribe(new Subscriber<String>() { public void

    onSubscribe(Subscription subscription) { subscription.request(Long.MAX_VALUE); System.out.println("subscribed"); } public void onNext(String s) { int num = Integer.parseInt(s); System.out.println(num); } public void onError(Throwable throwable) { System.out.println("error"); } public void onComplete() { System.out.println("completed"); } }); TVCTDSJCFE
    
    
    
    
    DPNQMFUFE SFTVMU ੜ੒ ᶃ։࢝ ᶄσʔλऔಘ ᶅਖ਼ৗऴྃ

19. ߪಡॲཧ ؔ਺ܕ*OUFSGBDF +BWB Flowable.just("1", "2", "3", "4")
 .subscribe(s -> {


    int num = Integer.parseInt(s);
 System.out.println(num);
 }, throwable -> {
 System.out.println("error : " + throwable.getMessage());
 }); 
    
    
     SFTVMU /FYUॲཧϋϯυϦϯά Τϥʔॲཧ

20. ߪಡॲཧ ؔ਺ܕ*OUFSGBDF +BWB public final Disposable subscribe(Consumer<? super T> onNext,

    Consumer<? super Throwable> onError, Action onComplete, Consumer<? super Subscription> onSubscribe) { LambdaSubscriber<T> ls = new LambdaSubscriber( onNext, onError, onComplete, onSubscribe); this.subscribe((FlowableSubscriber)ls); return ls; } ಺෦తʹ4VCTDSJCFSΛ࡞੒ͯ͠ॲཧ͍ͯ͠Δ

21. 'MPXBCMFͱ+BWB
    4USFBN
    "1*ͱͷҧ͍ w 'MPXBCMF͸࠶ར༻Մೳ
    w 'MPXBCMF͸࣮ߦ5ISFBEΛॲཧ్தͰ੾Γସ͑Մೳ
    w ྫ֎ͷѻ͍
    
    4USFBN
    "1*͸֎ଆʹ఻ൖ͢Δ
    
    'MPXBCMF͸಺෦Ͱॲཧ͢Δ͜ͱ͕Մೳ

22. 4USFBN
    "1* ࠶ར༻ෆՄ Stream<String> st = Arrays.asList("1", "2", "3", "4").stream();
 st.forEach(s

    -> {
 System.out.println(s);
 }); System.out.println(“next"); 
 st.forEach(s -> {
 System.out.println(s);
 }); 
    
    
    
    OFYU
    KBWBMBOH*MMFHBM4UBUF&YDFQUJPO
    TUSFBN
    IBT
    BMSFBEZ
    CFFO
    PQFSBUFE
    VQPO
    PS
    DMPTFE
    
    BU
    KBWBVUJMTUSFBN"CTUSBDU1JQFMJOFJOJU "CTUSBDU1JQFMJOFKBWB
    
    
    
    
    
    
    
    
    ʜ SFTVMU

23. 'MPXBCMF ࠶ར༻Մೳ Flowable<String> flowable = Flowable.just("1", "2", "3", "4"); flowable.subscribe(s

    -> { System.out.println(s); }); System.out.println("next"); flowable.subscribe(s -> { System.out.println(s); }); 
    
    
    
    OFYU
    
    
    
     SFTVMU

24. 'MPXBCMF ྫ֎ͷѻ͍ Flowable.just("1", "2", "three", “4") .map(Integer::parseInt)
 .subscribe(num -> {


    System.out.println(num);
 }
 , throwable -> {
 System.out.println("error : " + throwable.getMessage());
 }); 
    
    FSSPS
    
    'PS
    JOQVU
    TUSJOH
    UISFF SFTVMU /VNCFS'PSNBU&YDFQUJPO Τϥʔऴྃ

25. 'MPXBCMF ࣮ߦ5ISFBE੍ޚ Flowable.just("a", "b", "c", "d") .map(s -> { System.out.println(Thread.currentThread().getName()

    + " : " + s); return s.toUpperCase(); }) .subscribeOn(Schedulers.newThread()) .observeOn(Schedulers.computation()) .blockingSubscribe(s -> { System.out.println(Thread.currentThread().getName() + " : " + s); }); 3Y/FX5ISFBE4DIFEVMFS
    
    B
    3Y/FX5ISFBE4DIFEVMFS
    
    C
    3Y/FX5ISFBE4DIFEVMFS
    
    D
    3Y/FX5ISFBE4DIFEVMFS
    
    E
    3Y$PNQVUBUJPO5ISFBE1PPM
    
    "
    3Y$PNQVUBUJPO5ISFBE1PPM
    
    #
    3Y$PNQVUBUJPO5ISFBE1PPM
    
    $
    3Y$PNQVUBUJPO5ISFBE1PPM
    
    % SFTVMU TVCTDSJCF0O
    
    'MPXBCMF
    
    0CTFSWFCMFॲཧͷ࣮ߦεϨου
    PCTFSWF0O
    
    
    
    
    ͦΕҎ߱ͷ࣮ߦεϨου ݩͷ'MPXBCMFͷ࣮ߦεϨουΛࢦఆ ͜͜Ҏ߱ͷ࣮ߦεϨουΛࢦఆ

26. ม׵ॲཧ NBQ Flowable.just(1, 2, 3, 4) .map(num -> num *

    num)
 .subscribe(num -> {
 System.out.println(num);
 }); 
    
    
     SFTVMU NBQ͸ετϦʔϜ಺ͷσʔλͦͷ΋ͷΛม׵͢Δ

27. ม׵ॲཧ qBU.BQ Flowable.just(1, 2) .flatMap(v -> { // new flowable

    return Flowable.just(v, 2 * v); }) .subscribe(System.out::println); 
    
    
     SFTVMU qBU.BQ͸σʔλ͔Β'MPXBCMFΛ࡞੒ͯ͠
    ࠷ऴతʹl'MPXBCMFΛऔΓ෷ͬͯzετϦʔϜΛߏங͢Δ " 'MPXBCMF "
    " # $ 'MPXBCMF #
    # 'MPXBCMF $
    $ " # $ " # $

28. ม׵ॲཧ qBU.BQ public Flowable<Integer> square(int v) { return Flowable.just(v).map(w ->

    w * w); } public Flowable<Integer> twin(int v) { return Flowable.just(v, v); }; Flowable<Integer> f1 = Flowable.just(1,2); Flowable<Integer> f2 = f1.flatMap(v -> square(v)); Flowable<Integer> f3 = f2.flatMap(v -> twin(v)); f1.subscribe(v1 -> System.out.println("f1 : " + v1)); f2.subscribe(v1 -> System.out.println("f2 : " + v1)); f3.subscribe(v1 -> System.out.println("f3 : " + v1)); G
    
    
    G
    
    
    G
    
    
    G
    
    
    G
    
    
    G
    
    
    G
    
    
    G
    
     SFTVMU 'MPXBCMF͸ʮ͋Δঢ়ଶʯͷσʔλετ ϦʔϜΛఆٛ͠
    ม਺ͷΑ͏ʹѻ͑Δ
    

29. w ετϦʔϜͷੜ੒ॲཧ
    
    KVTU
    
    GSPN$BMMBCMF
    
    GSPN"SSBZ
    ͳͲ
    w σʔλม׵ॲཧ
    
    pMUFS
    NBQ
    
    qBU.BQ
    ͳͲ
    w ߹੒ॲཧ
    
    NFSHF
    
    [JQ
    
    DPNCJOF-BUFTU
    ͳͲ
    w

    ෭࡞༻ ߪಡऀ΁ͷ௨஌ͱ͸ผͷॲཧ
    
    EP0O4VCTDSJCF
    
    EP0O/FYU
    
    EP0O$PNQMFUF
    ͳͲ ΦϖϨʔλͷछผ ม׵ ੜ੒ TVCTDSJCF ߹੒ ෭࡞༻ ੜ੒ ม׵

30. )PU
    
    $PME

31. )PU
    
    $PME
    ͱ͍͏ੑ࣭ w ੜ࢈ऀ 'MPXBCMF
    
    0CTFSWBCMF ͷੑ࣭
    w $PME͸ճ͝ͱͷར༻
    
    ߪಡ͞Εͳ͍ͱՔಇͤͣɺߪಡ͝ͱʹ৽͍͠ετϦʔϜ͕࠶ੜ͞ΕΔ
    
    'MPXBCMF
    
    0CTFSWBCMF͸େମ$PME
    
    ಈըͰݴ͏ͱ:PV5VCFͷ࠶ੜͷΑ͏ͳײ͡
    

    w )PU͸ܧଓతͳར༻
    
    ετϦʔϜ͔Β஋ΛৗʹਨΕྲྀ͢
    
    ෳ਺ͷߪಡऀʹಉ࣌ʹσʔλΛ௨஌͢Δ
    
    ಈըͰݴ͏ͱςϨϏͷΑ͏ͳײ͡

32. 3Y+BWBͷ)PU$PME OFYU OFYU OFYU $PME 4VCTDSJCFS OFYU OFYU OFYU $PMEͷετϦʔϜ͸ߪಡऀ͝ͱʹ࠶౓࠶ੜ͞ΕΔΑ͏ͳΠϝʔδ

    4VCTDSJCFS

33. 3Y+BWBͷ)PU$PME OFYU OFYU OFYU )PU )PUͷߪಡ͸ߪಡऀ͕ਨΕྲྀ͞ΕΔσʔλΛͦΕͧΕಡΉΠϝʔδ ਨΕྲྀ͠ 4VCTDSJCFS 4VCTDSJCFS

34. )PUͳੜ࢈ऀ 1SPDFTTPS PublishProcessor<Integer> processor = PublishProcessor.create(); processor.subscribe(num -> { System.out.println("number1

    : " + num); }); processor.subscribe(num -> { System.out.println("number2 : " + num); }); processor.onNext(1); processor.onNext(2); processor.onNext(3); processor.onNext(4); OVNCFS
    
    
    OVNCFS
    
    
    OVNCFS
    
    
    OVNCFS
    
    
    OVNCFS
    
    
    OVNCFS
    
    
    OVNCFS
    
    
    OVNCFS
    
     SFTVMU ߪಡొ࿥ ෳ਺ొ࿥Մೳ σʔλొ࿥
    1SPDFTTPSʹ͸ड͚ޱ΋༻ҙ͞Ε͍ͯΔ

35. ΞδΣϯμ w 3Y+BWBͷ֓ཁ
    w 3Y+BWBͷجຊ
    w "OESPJEΞϓϦͰͷར༻ʹ͍ͭͯ
    w αʔόαΠυͰͷར༻ʹ͍ͭͯ
    w

    ·ͱΊ

36. ϢʔβʔΞΫγϣϯͰͷ׆༻ྫ RxTextView.textChanges(a1Text) .subscribe(e -> { b1Text.setText( “” + (Long.parseLong(e.text) +

    Long.parseLong(a2Text.getText()))); }); RxView.clicks(button) .debounce(1L, TimeUnit.SECONDS) .subscribe(x -> { // ੍ݶ͞Εͨೖྗ }) 3Y+BWBͷαϯϓϧͱͯ͠ग़ͯདྷΔ͕
    ඞਢͱ͍͏Θ͚Ͱ΋ͳ͍ ݸਓతҙݟ

37. "OESPJEͰ3Y+BWB͕
    ࠷΋࢖ΘΕ͍Δ৔໘
    ωοτϫʔΫ௨৴

38. લఏͱͯ͠"OESPJEΞϓϦͷ੍ݶ w ϘλϯλοϓͰը໘ΛϩοΫ͠ͳ͍͜ͱ͕ਪ঑͞ΕΔ
    w ը໘ૢ࡞͸6*εϨου ϝΠϯεϨου ͰͷΈ࣮ࢪՄೳ
    w ωοτϫʔΫ௨৴͸6*εϨουʮҎ֎ʯͰ࣮ࢪՄೳ 6*
    5ISFBE

    *0
    5ISFBE 7JFX
    ߋ৽ "1*
    $BMM
    

39. ඪ४ͷ"TZOD5BTL-PBEFSαϯϓϧ public class MainActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks<Bitmap> { //

    ActivityͷͲ͔͜ʹ͋ΔϘλϯλοϓίʔυ button.setOnClickListener(new OnSingleClickListener() {
 @Override
 public void onSingleClick(View view) {
 Bundle args = new Bundle(); args.putString("url", url); // ඇಉظॲཧΛґཔ getSupportLoaderManager().initLoader(0, args, this); } }); @Override public void Loader<Bitmap> onCreateLoader(int id, Bundle args) { return new ImageAsyncTaskLoader(this, args.getString("url")); } @Override public void onLoadFinished(Loader<Bitmap> arg0, Bitmap arg1) { imageView.setImageDrawable(new BitmapDrawable(getResources(), bmp)); } } Ϋϥογϡ͢ΔՄೳੑ͋Γ σʔλऔಘґཔ ݁Ռ$BMMCBDLΛड͚ͯ7JFXߋ৽
    

40. "TZOD5BTLதʹ"DUJWJUZ͕ফ͑ڈΔ w ωοτϫʔΫ௨৴தʹผͷը໘͕ىಈ͢Δ
    - ϝϞϦ͕গͳ͍ͱόοΫάϥϯυͷActivity͸kill͞ΕΔ w ωοτϫʔΫ௨৴தʹը໘͕ճస͞ΕΔ
    - ը໘͕ճస͞ΕΔͱActivity͸࠶࡞੒͞ΕΔ w

    جຊతʹʮফ͑Δ͜ͱલఏʹ࡞Δʯͱ͍͏ελϯε

41. "OESPJEΞϓϦͷωοτϫʔΫ௨৴ w ໰୊
    - AsyncTaskॲཧͰ͸ਖ਼࣮͘͠૷͢Δίετ͕ߴ͍ - Callback੍ޚ͕ෳࡶʹͳΓ1 ActivityͰ࢖͑ΔAPIΛ૿΍͠ʹ͍͘ • ཧ૝తͳॲཧ

    - ࣮ߦεϨουͷ੍ޚΛ؆୯ʹߦ͍͍ͨ - Activityͷഁغ࣌ʹ͸ߋ৽ॲཧΛࢭΊ͍ͨ - ෳ਺ͷAPIΛݺͼग़͢৔߹ʹ΋͏·͘ॲཧ͍ͨ͠

42. 3Y+BWB
    
    3Y"OESPJE
    
    3Y-JGFDZDMF

43. 3Y+BWBͰ؆ܿʹهࡌ public class MainActivity extends RxActivity { // ActivityͷͲ͔͜ʹ͋ΔϘλϯλοϓίʔυ button.setOnClickListener(()

    -> {
 Flowable.fromCallable(() -> { return userModel.get(userId); }) .compose(bindToLifecycle()) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(user -> { textView.setText(user.getName())); }); } } Ϣʔβʔ৘ใऔಘ "DUJWJUZ͕ഁغ͞ΕͨΒॲཧΛ΍ΊΔ 5ISFBE੍ޚ 7JFXߋ৽

44. ࠶ར༻ͷͨΊʹ'MPXBCMFʹ͓͖͍ͯͨ͠ public class UserModel { public User get(String userId) {


    …
 } } public class UserModel { public Flowable<User> get(String userId) {
 …
 } } 'MPXBCMFϕʔεͷ໭Γ஋Λ࡞੒

45. public class MainActivity extends RxActivity { button.setOnClickListener(() -> { userModel.get(userId)


    .flatMap(user -> imageMode.loadBitmap(user.getProfileUrl)) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(bmp -> { imageView.setImageDrawable(new BitmapDrawable(getResources(), bmp)); }); } } ࠶ར༻ɿͭͷॲཧΛ߹੒ͯ݁͠ՌΛऔಘ ม׵࣌ʹՄಡੑ͕ߴ·Δ Ϣʔβʔ৘ใΛऔಘͯ͠
    ϓϩϑΟʔϧը૾औಘ

46. ࠶ར༻ɿҰׅऔಘ [JQ public class MainActivity extends RxActivity { button.setOnClickListener(() ->

    { Flowable.zip( userModel.get(userId), imageModel.get(url) )
 .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe((user, bmp) -> { textView.setText(user.name); imageView.setImageDrawable(new BitmapDrawable(getResources(), bmp)); }); } } ෳ਺ͷॲཧΛҰؾʹཁٻͯ͠
    ݁Ռ͕ͦΖͬͨஈ֊Ͱ7JFXߋ৽
    

47. ϦτϥΠ public class MainActivity extends RxActivity { button.setOnClickListener(() -> {

    userModel.get(userId)
 .flatMap(user -> imageMode.loadBitmap(this.user.profileUrl)) .retry(3, throwable -> { // retryՄ൱ίʔυ return true; }) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(bmp -> { imageView.setImageDrawable(new BitmapDrawable(getResources(), bmp)); }); } } qBU.BQͨ͠ॲཧશମ͕Τϥʔ࣌࠶࣮ߦ͞ΕΔ
    

48. 3Y+BWB͸
    ෳ਺ͷը໘ͷҰׅߋ৽ʹ΋࢖ΘΕΔ

49. ಉҰσʔλΛࢀর͢Δෳ਺ͷը໘ w ϝϞϦ͕͋Ε͹"DUJWJUZ͕ελοΫ͞Ε͍ͯͯ࢒͍ͬͯΔ
    w ΠϯελάϥϜͷz͍͍ͶzͳͲ͸ɺλοϓ͞Εͨॠؒʹશը ໘ʹσʔλΛ൓өͤ͞Δඞཁ͕͋Δ IUUQTTIPNBEBOFUXQDPOUFOUVQMPBETTJOHMF5BTLYKQH

50. 1SPDFTTPSΛར༻ͨ͠ߋ৽Πϕϯτϋϒ w 1SPDFTTPSʹྲྀΕΔσʔλΛߪಡ͢Δ͜ͱͰෳ਺ͷ7JFXΛ ߋ৽ग़དྷΔ 1SPDFTTPS 7JFXߋ৽ 7JFXߋ৽ %BUB
    $IBOHF
    &WFOU

    PO/FYU TVCTDSJCF TVCTDSJCF

51. w ͭલʹྲྀΕͨσʔλΛอ࣋͢Δ#FIBWJPS1SPDFTTPS
    w ྫ͑͹࠷৽ͷϩάΠϯϢʔβʔσʔλΛΩϟογϡ͓ͯ͘͠ ͳͲͷ࢖͍ํ͕ग़དྷΔ #FIBWJPS
    1SPDFTTPS ৽ن7JFX 7JFXߋ৽ TVCTDSJCF

    TVCTDSJCF ࠷৽ͷ݅Λอ࣋ %BUB
    $IBOHF
    &WFOU PO/FYU ৽͘͠TVCTDSJCF͞Εͨ΋ͷʹΩϟογϡ͞Εͨ݅Λྲྀ͢ ༷ʑͳ1SPDFTTPS

52. w "OESPJEಛ༗ͷ໰୊ʹΑΓωοτϫʔΫ௨৴Ͱඞཁ
    
    3Y+BWBΛߴ౓ͳ1SPNJTFతʹར༻
    w .PEFM૚ͷ໭Γ஋Λ'MPXBCMFԽ
    
    খ͞ͳॲཧΛ߹੒༷ͯ͠ʑͳॲཧΛੜΈग़͢
    
    มߋͷଟ͍ϞόΠϧΞϓϦͰ͸ॏๅ͢Δ
    "OESPJEΞϓϦ։ൃͰͷ͔͍ͭͲ͜Ζ

53. ΞδΣϯμ w 3Y+BWBͷ֓ཁ
    w 3Y+BWBͷجຊ
    w "OESPJEΞϓϦͰͷར༻ʹ͍ͭͯ
    w αʔόαΠυͰͷར༻ʹ͍ͭͯ
    w

    ·ͱΊ

54. αʔόαΠυͰͷར༻Ҋ w ϚΠΫϩαʔϏεͰͷ"1*
    $BMM
    - ࣮ߦεϨου੍ޚ - Back PressureʹΑΔ੍ޚ - ෳ਺αʔϏεݺͼग़͠ͷ߹੒

    - ϦτϥΠͳͲͷ੍ޚ ϑϩϯτ޲͚"1* Ϣʔβʔ৘ใαʔϏε ը૾৘ใαʔϏε "1*
    $BMM "1*
    $BMM "1*
    $BMM Ґஔ৘ใαʔϏε

55. 3FBDUJWF
    8FC
    1SPHSBNNJOH

56. w Ϟσϧ૚ͷॲཧ %#ΞΫηεɺ"1*
    $BMM ΛετϦʔϜԽ
    w ίϯτϩʔϥͰϨεϙϯεΛੜ੒͢Δ࣌ʹϒϩοΩϯά͞ ΕΔ Ϟσϧ૚͚ͩϦΞΫςΟϒରԠʁ $POUSPMMFS ετϦʔϜ࡞੒

    CMPDLJOH4VCTDSJCF .PEFM CMPDLJOH SFRVFTU SFTQPOTF

57. w ίϯτϩʔϥͰετϦʔϜΛߪಡ͠ͳ͍ͷͰϊϯϒϩοΩϯάͰॲཧՄೳ
    - ߴύϑΥʔϚϯε͕ظ଴Ͱ͖Δ - εϨουͷ༗ޮར༻͕ظ଴Ͱ͖Δ w )551ΫΤετͷड͚ޱʹ֤ͯσʔλͷੜ੒΍ग़ྗ·ͰͷzྲྀΕzΛ؆ܿʹ هड़ग़དྷΔ ίϯτϩʔϥ૚ͷϦΞΫςΟϒରԠ

    $POUSPMMFS ετϦʔϜ࡞੒ TVCTDSJCF .PEFM 'SBNFXPSL ετϦʔϜ࡞੒ ετϦʔϜ
    ߹੒ɾม׵

58. 4QSJOH
    #PPU
    Ͱ࣮ݱՄೳ

59. 4QSJOHͰ͸3FBDUPS͕࢖ΘΕΔ w 3YʹӨڹΛड͚ͨϦΞΫςΟϒϥΠϒϥϦ
    
    3Y+BWBͱಉ͡ΦϖϨʔλ΋ଟ਺͋Γ
    w 3FBDUJWF
    4USFBNTʹ४ڌ 3Y+BWB 3FBDUPS ରԠ+BWBόʔδϣϯ +BWB
    

    +BWB
     0CTFSWBCMFγʔέϯε 'MPXBCMF 'MVY εϨου੍ޚϝιου TVCTDSJCF0O
 PCTFSWF0O TVCTDSJCF0O
    QVCMJTI0O 3Y+BWBͱ3FBDUPSͰେ͖͘ҧ͏ͱ͜Ζ

60. 4QSJOH
    8FC
    3FBDUJWFͷαϯϓϧ @GetMapping(value = "/github_user", produces = "application/json") public Flux<GithubUser> githubUser()

    { return httpGet("https://api.github.com/users?slice=1") .flatMapMany(response -> response.bodyToFlux(GithubUser.class)) .take(5); } public Mono<ClientResponse> httpGet(String url) { WebClient client = WebClient.create(url); return client.get().uri("").exchange(); } public class GithubUser { public String login; public String avatar_url; public String toString() { return "[login : " + login + ", avator_url : " + avatar_url + "]"; } } > curl http://localhost/github_user [{"login":"mojombo","avatar_url":"https://avatars3.githubusercontent.com/u/1?v=3"}, {"login":"defunkt","avatar_url":"https://avatars3.githubusercontent.com/u/2?v=3"}, {"login":"pjhyett","avatar_url":"https://avatars3.githubusercontent.com/u/3?v=3"}, {"login":"wycats","avatar_url":"https://avatars3.githubusercontent.com/u/4?v=3"}, {"login":"ezmobius","avatar_url":"https://avatars3.githubusercontent.com/u/5?v=3"}] SFTVMU 'MVYϕʔεͷϨεϙϯε 3FBDUJWF
    8FC
    $MJFOU

61. ΋͔ͨ͠͠Βศརͳ࢖͍ํ w σʔλ഑৴੍ޚ
    - σʔλΛอ࣋͢ΔετϦʔϜ - λΠϛϯάΛ੍ޚ͢ΔΞΫγϣϯετϦʔϜ - 2ͭΛ෼͚ͯετϦʔϜԽͯ͠߹੒͢Δ͜ͱͰෳࡶͳ੍ޚΛ࣮ݱ σʔλετϦʔϜ

    ΞΫγϣϯετϦʔϜ
    ఆظ࣮ߦ΍ඇಉظΠϕϯτ ߹੒ 
    [JQ
    
    DPNCJOF-BUFTU σʔλ഑৴੍ޚ

62. [JQ w ̎ͭҎ্ ͭҎԼ ͷετϦʔϜΛʮ߹੒ʯ͢Δ
    w σʔλ͕ྲྀΕΔλΠϛϯά͸֤ετϦʔϜͷσʔλ͕ἧͬ ͨͱ͖
    [JQ Y

    
    Z
    
    lz
    
    Y
    
    Z     " # $ " ߹੒݁Ռ # $

63. " # $ DPNCJOF-BUFTU w ̎ͭҎ্ ͭҎԼ ͷετϦʔϜΛʮ߹੒ʯ͢Δ
    w σʔλྲྀΕΔλΠϛϯά͸ετϦʔϜͷͲΕ͔ʹz/FYUz͕ൃߦͨ͞ͱ͖
    

    w /FYU͕ൃߦ͞Εͳ͔ͬͨํ͸લճྲྀͨ͠σʔλ -BUFTU Λ࠶౓ྲྀ͢
    DPNCJOF-BUFTU Y
    Z
    
    lz
    
    Y
    
    Z     " ߹੒݁Ռ # # $ $

64. 4FSWFS4FOU
    &WFOUTͰ߹੒Λ࢖͏ @GetMapping(value = "/stream_data/", produces = "text/event-stream") public Flux<GithubUser> streamData()

    { Flux<Long> interval = Flux.interval(Duration.ofSeconds(1)); Flux<GithubUser> results = httpGet("https://api.github.com/users?slice=1") .flatMapMany(response -> response.bodyToFlux(GithubUser.class)) .take(5); return Flux.zip(interval, results) .map(Tuple2::getT2); } λΠϛϯάΛ͸͔Δ'MVY σʔλΛੜ੒͢Δ'MVY

65. [JQͨ݁͠Ռ ඵ͝ͱʹ̍ߦ௥Ճ͞Ε͍ͯ͘

66. ΞδΣϯμ w 3Y+BWBͷ֓ཁ
    w 3Y+BWBͷجຊ
    w "OESPJEΞϓϦͰͷར༻
    w αʔόαΠυͰͷར༻ʹ͍ͭͯ
    w

    ·ͱΊ

67. ࣮ࡍʹͲ͏΍ͬͯಋೖ͔ͨ͠ʁ w "OESPJEΞϓϦʹ೥Ҏ্લʹಋೖ
    w J04։ൃऀͰϦΞΫςΟϒϓϩάϥϛϯά࣮ફऀ͕νʔϜʹ δϣΠϯͨ͠ͷ͕͖͔͚ͬ
    w ޱ಄ʹΑΔઆ໌΍13ϨϏϡʔΛ௨ͯ͡νʔϜʹ఻ൖ
    w ઃܭʹ͍ͭͯ͸τϥΠΞϯυΤϥʔ

    Ұੲલ͸Ұॹʹٞ࿦ग़དྷΔਓ͕ډͳ͍ͱಋೖ͠ʹ͍͘ঢ়ଶͩͬͨ

68. ࠓͳΒಠश͸ՄೳͰ͸ʁ w ʮ3Y+BWBϦΞΫςΟϒϓϩάϥϛϯάʯ͕ૉ੖Β͍͠
    w ࣮ࡍʹखΛಈ͔༷ͯ͠ʑͳಈ࡞Λ֬ೝͯ͠ΈΔͷ͕ཧղ΁ͷۙಓ
    
    IUUQSYNBSCMFTDPN
    ΋ࢀߟʹ
    w ઃܭ࿦ͳͲ΋೔ຊޠจݙ͕2JJUBʹͨ͘͞Μ্͕͍ͬͯΔ

69. 3Y+BWBͰؾΛ͚ͭΔ͜ͱ w QVCMJDͳϝιουΛ'MPXBCMF0CTFSWBCMFʹґଘͤͨ͞৔ ߹ͷةݥੑ
    
    όʔδϣϯΞοϓ࣌ͷޙํޓ׵ੑͷةݥੑ
    
    ଞͷϑϨʔϜϫʔΫ΁ͷ৐Γ׵͑ΒΕͳ͍ةݥੑ

70. $PODMVTJPO w 3Y+BWB͸ඇಉظͳσʔλετϦʔϜΛॲཧ͢ΔϥΠϒϥϦɻεϨου੍ޚ͕ಛ ௃తͰؔ਺ܕతͳΦϖϨʔλΛଟ࣋ͭ͘
    w 3Y+BWBͷ࢖͍ॴɿ"OESPJEΞϓϦͷͷωοτϫʔΫ௨৴ॲཧΛ؆ܿʹهड़ग़དྷ Δ
    w 8FCϓϩάϥϛϯάʹ͓͍ͯ΋ϦΞΫςΟϒϓϩάϥϛϯά͸ॏཁ౓Λ૿ͯ͠ ͖ͦ͏
    

    w "OESPJEΞϓϦ։ൃҎ֎ͳΒ3FBDUPS͕ྑ͍બ୒ࢶͰ͸
    
    ͨͩ͠೔ຊޠจݙͷଟ͔͞Β3Y+BWBͰษڧ͓ͯ͘͠ͱ͍͏ͷ΋ΞϦͰ͸

71. ϦΞΫςΟϒϓϩάϥϛϯάͰ
    ͖ͬͱϓϩάϥϛϯά͕
    ΋ͬͱָ͘͠ͳΔ͸ͣʂ

72. ॕ"OESPJEͰ,PUMJO͕ਖ਼ࣜαϙʔτʂʂ w 3Y+BWB͸,PUMJOͰ΋࢖͑Δ
    w 3Y,PUMJO΋͋Δ val list = listOf("Alpha", "Beta",

    "Gamma", "Delta", "Epsilon") list.toObservable() // extension function for Iterables

73. ࢀߟจݙ w IUUQOJOKJOLVOIBUFOBCMPHDPNFOUSZJOUSPSYKB
    ʲ຋༁ʳ͋ͳ͕ͨٻΊ͍ͯͨϦΞΫςΟϒϓϩάϥϛϯάೖ໳
    w IUUQPLBQJFTIBUFCMPKQFOUSZ
    ؔ਺ܕϓϩάϥϚͷͨΊͷ
    3Y
    ೖ໳
    w IUUQRJJUBDPNZVZB@QSFTUPJUFNTGBEEDGD
    3Y+BWBʹ೔Ͱೖ໳͠ɺ"OESPJEΞϓϦͷϦετૢ࡞ɺඇಉظॲཧɺมߋ௨஌ͷ՝୊Λղܾͨ͠࿩
    

    w IUUQTCMPHJLBNFOUSJFT
    3Y+BWBϦΞΫςΟϒϓϩάϥϛϯάʯ͸4QSJOH
    
    
    3FBDUPSΛษڧ͢Δͷʹ΋໾ʹཱͭॻ੶
    w IUUQTHJUIVCDPNKZVLVUZPTQSJOHSFBDUJWFFYBNQMF