PHPエンジニアによるScalaエンジニアへの転身とその手引き

Transcript

1. ݪాਅޗ 1)1ΤϯδχΞʹΑΔ4DBMBΤϯδ χΞ΁ͷస਎ͱͦͷखҾ͖ 4DBMBؔ੢
   4VNNJU
   

2. 2017/11/11 © ChatWork All rights reserved. 2 ࣗݾ঺հ ‣ $IBU8PSLגࣜձࣾ
   αʔόʔαΠυ։ൃ෦
   
   

   ‣ ೖࣾ ݱࡏͰஸ౓೥͙Β͍
   ‣ 1)1ΤϯδχΞͱͯ͠ೖࣾ
   ‣ ࠷ۙ4DBMBϓϩμΫτʹ΋KPJO 4DBMBྺϲ݄͙Β͍ɺ +BWBະܦݧ

3. 2017/11/11 © ChatWork All rights reserved. 3 $IBU8PSLʹ͍ͭͯ ‣ ϏδωενϟοταʔϏε
   

   ‣ λεΫ؅ཧɾϏσΦ௨࿩
   ‣ ಋೖاۀ
    ࣾҎ্

4. 2017/11/11 © ChatWork All rights reserved. 4 5PQJDT ‣ $IBU8PSLͰͷ4DBMBͷऔΓ૊Έ
   

   ‣ 4DBMBϓϩμΫτ΁ͷࢀՃɻֶशͷ͖᪴ͱղܾํ๏
   ‣ 4DBMBΤϯδχΞʹస਎ͯ͠Έͨ݁Ռ

5. 2017/11/11 © ChatWork All rights reserved. 5 $IBU8PSLͱ4DBMBͷؔ܎ɾ։ൃܦҢ

6. 2017/11/11 © ChatWork All rights reserved. 6 1)1։ൃ͔Β4DBMB։ൃ΁ ‣ ೥ࠒ͔Β1)1͚ͩͰͳ͘4DBMBϓϩμΫτ΋։ൃ
   

   ‣ 4DBMBϓϩμΫτͷ૿Ճ
   ‣ 0"VUI
   ‣ 8FCIPPL
   ‣ #PY࿈ܞ
   ‣ *'555࿈ܞ

7. 2017/11/11 © ChatWork All rights reserved. 7 $IBU8PSLͱ4DBMBͷؔ܎ ‣ $IBU8PSLͷ4DBMB࠾༻ϓϩμΫτ
   l'BMDPOz
   ϦϦʔε·Ͱͷࣦഊͱ

   ੒ޭͷྺ࢙
   4DBMB.BUTVSJ
   
   w IUUQTTQFBLFSEFDLDPNKJLPIJTUPSZPGGBMDPOUIFXBZUPQSPEVDUJPOSFMFBTF ‣ $IBU8PSLͷ৽ϝοηʔδϯάγεςϜΛࢧ͑Δٕज़
   "84
   %FW
   %BZ
   5PLZP
   
   w IUUQTTQFBLFSEFDLDPNKJLPDIBUXPSLGBMTFYJONFUVTF[JOHVTJTVUFNVXP[IJ FSVKJTIV
   ‣ 4DBMB
   BOE
   "LLB
   BQQT
   PO
   ,VCFSOFUFT
   JO
   $IBU8PSL
   4DBMBؔ੢
   4VNNJU
   
   w IUUQTTQFBLFSEFDLDPNIBZBTTIJTDBMBBOEBLLBBQQTPOLVCFSOFUFTJO DIBUXPSL

8. 2017/11/11 © ChatWork All rights reserved. 8 4DBMBϓϩμΫτ΁ͷࢀՃ
   ֶशͷ͖᪴ͱղܾ๏

9. 2017/11/11 © ChatWork All rights reserved. 9 4DBMBϓϩδΣΫτͰ࢖ΘΕ͍ͯͨ஌ࣝ ͱֶशঢ়گ ‣

   ࢖ΘΕ͍ͯͨϥΠϒϥϦͱݴޠͷဃ཭
   w TDBMB[
   "LLB
   LBNPO
   DJSDF
   FUDʜ
   ‣ ࠓ·Ͱܦݧͨ͠ϓϩάϥϛϯάݴޠ
   w 1)1ɺ1ZUIPOɺ$ʜ

10. 2017/11/11 © ChatWork All rights reserved. 10 1)1ˠ4DBMBֶशͷ݁Ռ

11. 2017/11/11 © ChatWork All rights reserved. 11 *'555࿈ܞΛ4DBMBͰ։ൃˍϦϦʔε ‣ ࢖༻ͯ͠ΔϥΠϒϥϦ
    

    w "LLB
    )UUQ
    w "LLB
    4USFBN
    w TDBMB[
    w DJSDF
    w FUD

12. 2017/11/11 © ChatWork All rights reserved. 12 *'555࿈ܞ
    ެࣜυΩϡϝϯτ
    IUUQTQMBUGPSNJGUUUDPNEPDT

13. 2017/11/11 © ChatWork All rights reserved. 13 4DBMBϓϩμΫτʹࢀՃ

14. 2017/11/11 © ChatWork All rights reserved. 14 େ͖ͳน ϓϩμΫτίʔυͱ஌ࣝͷဃ཭ def

    create(implicit scheduler: Scheduler): Flow[CreateUserAccountRequest, CreateUserAccountResponse, NotUsed] = Flow[CreateUserAccountRequest].mapAsync(1) { userAccount => (for { id <- userIdGenerator.generateId() result <- userRepository.store( UserAccount( id, Status.Active, EmailAddress(userAccount.emailAddress), HashedPassword(userAccount.password), userAccount.firstName, userAccount.lastName, Clock.now, None ) ) } yield CreateUserAccountResponse(id.value)).runAsync }

15. 2017/11/11 © ChatWork All rights reserved. 15 େ͖ͳน ϓϩμΫτίʔυͱ஌ࣝͷဃ཭ def

    create(implicit scheduler: Scheduler): Flow[CreateUserAccountRequest, CreateUserAccountResponse, NotUsed] = Flow[CreateUserAccountRequest].mapAsync(1) { userAccount => (for { id <- userIdGenerator.generateId() result <- userRepository.store( UserAccount( id, Status.Active, EmailAddress(userAccount.emailAddress), HashedPassword(userAccount.password), userAccount.firstName, userAccount.lastName, Clock.now, None ) ) } yield CreateUserAccountResponse(id.value)).runAsync }

16. 2017/11/11 © ChatWork All rights reserved. 16 ͳͥ೉͘͠ײͨ͡ͷ͔ ‣ 4DBMB͓Αͼؔ਺ܕݴޠʹ׳Ε͍ͯͳ͍
    

    w লུه๏ɺߴ֊ؔ਺ɺ҉໧ͷύϥϝʔλɺΧϦʔԽɺFUDʜ
    ‣ +BWBपΓͷ஌ࣝ
    ‣ ετϦʔϛϯάɺฒߦॲཧʹؔ͢Δ஌ࣝ

17. 2017/11/11 © ChatWork All rights reserved. 17 1)1ͱ4DBMBͷൺֱ 1)1 4DBMB

    ܕ෇͚ ಈత ੩త ϓϩάϥϜύϥμΠϜ खଓ͖ܕ
    ΦϒδΣΫτࢦ޲ ؔ਺ܕ
    ΦϒδΣΫτࢦ޲ ӨڹΛड͚ͨݴޠ 1FSM
    $ +BWB IUUQTKBXJLJQFEJBPSHXJLJϓϩάϥϛϯάݴޠͷൺֱ

18. 2017/11/11 © ChatWork All rights reserved. 18 ྫ ؔ਺ͷهड़ελΠϧ͕ෳ਺͋Δ //

    ܕΞϊςʔγϣϯΛ࢖͏ val toInt: (String => Int) = (s: String) => s.toInt // ܕΞϊςʔγϣϯΛলུ((Ҿ਺) => ຊମ) val toInt2 = (s: String) => s.toInt // ϓϨʔεϗϧμʔΛ࢖༻ͨ͠ܗ val toInt3: (String => Int) = _.toInt w FY
    TUSJOHΛҾ਺ʹͱͬͯɺJOUʹมߋ͢Δؔ਺ͷهड़ελΠϧʹͯ͠΋਺ύλʔϯ͋ΔΑ͏ ʹࢥ͑ͨ
    w 1)1ͷ৔߹
    w 4DBMBͷ৔߹
    $toInt = function(string $s) {return (int)$s;}; ‣ ࢀߟ
    w IUUQTHJTUHJUIVCDPNHBLV[[[[
    w IUUQTRJJUBDPNOFTIFFQJUFNTBFDFFGEG

19. 2017/11/11 © ChatWork All rights reserved. 19 ྫ ؔ਺ܕ ‣

    FY 
    UP
    ·Ͱͷ੔਺Ͱۮ਺ͷ΋ͷ͚ͩ ح਺͸আ͘ Λഒͯ͠ɺ ͦͷ૯࿨ΛٻΊΔ
    w 1)1ͷ৔߹
    // ᶃarray_**ܥͷؔ਺Λ࢖ͬͨ৔߹ $result = array_sum(
 array_map( function ($i) {
 return $i * 10;
 },
 array_filter(range(1, 10), function ($i) {
 return ($i % 2 === 0);
 })
 )
 ); // ᶄ݁ہ͜͏ͳΓͦ͏
 $result = 0;
 foreach (range(1, 10) as $int) {
 if ($int % 2 === 0) {
 $result += $int * 10;
 }
 }

20. 2017/11/11 © ChatWork All rights reserved. 20 ྫ ؔ਺ܕ def

    stringMatching(matcher: (String) => Boolean) = matcher("sample text") def stringStart(query: String) = stringMatching(_.startsWith(query)) // ҎԼͱಉٛ // strMatching((str: String) => str.startsWith(query)) def stringContain(query: String) = stringMatching(_.contains(query)) ‣ 4DBMBͷ৔߹ ϫϯϥΠφʔͰهड़Մೳ
    ‣ ଞͷྫɿ4USJOHΛҾ਺ʹͱΓɺCPPMFBOΛฦؔ͢਺Λ౉͢
    (1 to 10).withFilter(_ % 2 == 0).map(_ * 10).sum

21. 2017/11/11 © ChatWork All rights reserved. 21 +BWBपΓͷ஌ࣝ ‣ OVMM΁ͷߟྀ
    

    w /VMM1PJOUFS&YDFQUJPO͕ൃੜͯ͠͠·͏
    w SFUVSO
    WBMVF
    PS
    OVMMͷ+BWBϝιουΛݺͼग़࣌͢ʹ͸0QUJPOBQQMZͰғͬͯ͋ ͛Δ
    ‣ +BWBϥΠϒϥϦɺύοέʔδͷཧղ
    w MPHCBDLɺKBWBYDSZQUP
    w εϨουϓʔϧͷ෼ׂ
    ‣ FUDʜ
    akka { dispatcher { type = Dispatcher executor = "thread-pool-executor" thread-pool-executor { fixed-pool-size = 32 } throughput = 1 } }

22. 2017/11/11 © ChatWork All rights reserved. 22 ղܾํ๏ ‣ ஈ֊తʹֶΜͰ͍͘

    Ұ౓ʹଟ͘ͷ͜ͱΛֶ͹ͳ͍
    ‣ ݱঢ়ࠔ೉ͱͳΔཁҼΛ෼ׂͯ͠ ̍ͭͣͭ ֶͿ
    w ؔ਺ܕݴޠ
    w "LLB
    TUSFBN
    w +BWBͷ஌ࣝ
    w FUDʜ

23. 2017/11/11 © ChatWork All rights reserved. 23 ॻ੶ɾXFC ڭࡐͰֶश ‣

    ݴޠ࢓༷ɺؔ਺ܕ΍ετϦʔϜͷ֓೦ͳͲΛॏ఺తʹֶश
    ‣ XFC্Ͱͷ৘ใ
    w 4DBMBશൠ
    w IUUQTEXBOHPHJUIVCJPTDBMB@UFYU
    w IUUQTHJUIVCDPNIBUFOB)BUFOB5FYUCPPLCMPCNBTUFS GPVOEBUJPOPGQSPHSBNNJOHTDBMBNE
    w "LLB
    4USFBN
    w IUUQTUIJOLJUDPKQBSUJDMF

24. 2017/11/11 © ChatWork All rights reserved. 24 4DBMB ࣾ಺ڭࡐͷ׆༻ ‣

    ԋश՝୊Ͱ࣮ࡍʹखΛಈֶ͔ͭͭ͠श

25. 2017/11/11 © ChatWork All rights reserved. 25 ࣾ಺ͷϦιʔεΛ׆༻͢Δ ‣ ༗ࣝऀʹώΞϦϯάˍϖΞϓϩ
    

    ‣ 4DBMBઐ༻νϟοτ 4DBMB෦ ͷ׆༻

26. 2017/11/11 © ChatWork All rights reserved. 26 श࡞ͰຒΊΔ ‣ ΑΓ࣮ફతͳ಺༰ͰϓϩμΫτίʔυͱͷࠩ෼ΛঃʑʹຒΊΔ
    

    ‣ श࡞ ՝୊ͷ࣮ࢪ
    w 4DBMB ࣾ಺ڭࡐ
    w FY
    1MBZ
    'SBNFXPSLͷԋश՝୊
    w "LLB (SBQI4UBHFΛ࢖༻ͯ͠ϑΝΠϧˠ%#΁ͷ؆୯ͳॲཧ
    w SBNM
    QBSTFSͷ࡞੒
    w FUD
    ‣ ϥΠϒϥϦ࡞੒ˍΞϓϦέʔγϣϯ։ൃ

27. 2017/11/11 © ChatWork All rights reserved. 27 ஈ֊Λ౿ΜͰ੒Ռ෺ͷϦϦʔε ੒Ռ෺ϦϦʔε श࡞՝୊

    4DBMB ݴޠֶश ϓϩμΫτࢀՃ ࣌ܥྻ

28. 2017/11/11 © ChatWork All rights reserved. 28 4DBMB։ൃͷײ૝ ‣ ੩తܕɺؔ਺ܕͷԸܙ
    

    w 1)1Ͱ͸ػೳ௥ՃʹΑΔςετ΍֬ೝ࡞ۀ͕େม Өڹൣғ͕ݟ͑ʹ͍͘
    w ϞσϦϯάɺϦϑΝΫλ͠΍͍͢
    ‣ ֶश͕ਐΉʹͭΕརศੑΛ࣮ײ
    w ঺հग़དྷͳ͔͚ͬͨͲ NBUDI
    DBTF
    'VUVSFɺ&JUIFSɺ0QUJPOɺFUDʜ
    ‣ +BWBͷ๛෋ͳࢿ࢈Λ׆༻Ͱ͖Δ

29. 2017/11/11 © ChatWork All rights reserved. 29 ·ͱΊ ‣ 4DBMBΛֶश͔Βೖͬͯ։ൃग़དྷΔ؀ڥ͕͋Δ
    

    ‣ ΩϟονΞοϓɺ੒௕ग़དྷΔ؀ڥ͕͋Δ
    ‣ ʮֶशʯˠʮश࡞ʯˠʮϓϩμΫτʯͱ͍ͬͨΑ͏ʹஈ֊Λ౿Ή͜ ͱ͕Ͱ͖ͨ
    ‣ ඼࣭͕୲อ͞Εอकɾӡ༻͕͠΍͘͢ͳΔ
    ‣ ৽ͨͳߟ͑ΛऔΓೖΕΒΕΔ
    ‣ ੩తɺؔ਺ܕɺඇಉظɺฒߦϓϩάϥϛϯάɺFUDʜ

30. 2017/11/11 © ChatWork All rights reserved. 30 ҰॹʹνϟοτϫʔΫΛྑ͍͖ͯͨ͘͠ ͍ΤϯδχΞͷํΛืूʂ IUUQTDPSQDIBUXPSLDPNKBSFDSVJUFOHJOFFS

31. 2017/11/11 © ChatWork All rights reserved. 31 ͝ਗ਼ௌ͋Γ͕ͱ͏ޚ࠲͍·ͨ͠