RxJava学習のベストプラクティスっぽいもの

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3Y+BWBֶशͷϕετϓϥΫςΟεͬΆ͍΋ͷ 2015/03/17(Ր) ീ໦

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3Y+BWBJTUPPIVHF

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4UFQCZTUFQMFBSOJOH

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4UFQCZTUFQBQQMJDBUJPO

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w ֓೦ w ֓೦ͷ+BWBԽ w ίϨΫγϣϯૢ࡞ w 1SPNJTF w -JGU w 4VCKFDU 3Y+BWB͸͜ͷॱͰֶ΂ʂʁ

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3Y+BWBͱ͸ https://rx.codeplex.com/ https://github.com/ReactiveX/RxJava

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w 3FBDUJWF&YUFOTJPOT 3Y ͸ɺ؍ଌՄೳ PCTFSWBCMF ͳγʔέϯεͱ-*/2ελΠϧͷΫ ΤϦԋࢉࢠΛ࢖ͬͯɺඇಉظͳΠϕϯτϕʔεͷϓ ϩάϥϜΛ߹੒͢ΔϥΠϒϥϦͰ͢ɻ3YΛ࢖͏ͱɺ ։ൃऀ͸ඇಉظσʔλετϦʔϜΛ0CTFSWBCMF Ͱද͠ɺඇಉظσʔλετϦʔϜʹର͢ΔΫΤϦ ʹ-*/2ԋࢉࢠΛ࢖͍ɺඇಉظετϦʔϜͷฒߦ ੑΛ4DIFEVMFSͰύϥϝλԽ͠·͢ɻ؆୯ʹݴ͑ ͹ɺ3Y0CTFSWBCMF-*/24DIFEVMFSͰ͢ɻ 3Y+BWBͱ͸ http://okapies.hateblo.jp/entry/2015/03/04/031148

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w 0CTFSWBCMFͱ͸࣌ؒUʹྲྀΕΔ4USFBNͰ͋Δ ֓೦

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w 0CTFSWBCMFͱ͸࣌ؒUʹྲྀΕΔ4USFBNͰ͋Δ ֓೦ Event Array Async ͲΕ΋࣌ؒUʹྲྀΕΔ4USFBNͱͯ͠ߟ͑Δ

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w &WFOUϢʔβ͕ૢ࡞ͨ࣌͠ U ͳͲʹൃՐ͢ΔΠϕϯτ w "TZODඇಉظॲཧ͕׬ྃ U ͨ͠ΒൃՐ͢ΔΠϕϯτ w "SSBZ֤ཁૉͷִؒ U ͕ݶΓͳ͘ʹ͍ۙΠϕϯτ ֓೦

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֓೦ ؔ਺Λద༻ Ͱ͖Δ ม׵ɺ߹੒ɺ࿈݁ɺϑΟϧλɺ৞ࠐΈɺಉظɺඇಉظ

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֓೦ͷ+BWBԽ

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֓೦ͷ+BWBԽ ࣌ؒUΛྲྀΕΔJOUFHFSͷTUSFBN 0CTFSWBCMF*OUFHFSDPVOUFSDSFBUF$PVOUFS

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֓೦ͷ+BWBԽ ࣌ؒUΛྲྀΕΔJOUFHFSͷTUSFBN 0CTFSWBCMF*OUFHFSDPVOUFSDSFBUF$PVOUFS 1 2 3 4

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֓೦ͷ+BWBԽ ؍ଌ͢Δ DPVOUFSTVCTDSJCF OFX"DUJPO*OUFHFS \ !0WFSSJEF QVCMJDWPJEDBMM *OUFHFSJOUFHFS \ EPTPNFUIJOH ^ ^

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֓೦ͷ+BWBԽ ؍ଌ͢Δ DPVOUFSTVCTDSJCF OFX"DUJPO*OUFHFS \ !0WFSSJEF QVCMJDWPJEDBMM *OUFHFSJOUFHFS \ EPTPNFUIJOH ^ ^ 1 2 3 4

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֓೦ͷ+BWBԽ ࣌ؒUΛྲྀΕΔ5PVDI&WFOUͷTUSFBN 0CTFSWBCMF5PVDI&WFOUUPVDIFTWJFXUPVDIFT Down Move Move Up

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֓೦ͷ+BWBԽ ؔ਺Λద༻͢Δ 0CTFSWBCMF5PVDI&WFOUUPVDI&WFOU.PWF UPVDIFTpMUFS OFX'VOD5PVDI&WFOU #PPMFBO \ !0WFSSJEF QVCMJD#PPMFBODBMM 5PVDI&WFOUUPVDI&WFOU \ SFUVSOUPVDI&WFOUUZQF .PWF ^ ^ Down Move Move Up Move Move

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֓೦ͷ+BWBԽ ؔ਺Λద༻͢Δ 0CTFSWBCMF4USJOHUPVDI&WFOU-PH UPVDIFTNBQ OFX'VOD5PVDI&WFOU 4USJOH \ !0WFSSJEF QVCMJD4USJOHDBMM 5PVDI&WFOUUPVDI&WFOU \ SFUVSOUPVDI&WFOUUP4USJOH ^ ^ Down Move Move Up “Move” “Move” “Down” “Up”

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0CTFSWBCMFͷϊϦ͸Θ͔ͬͨɻ ͡Ό͋۩ମతʹԿʹ࢖͏ͷʁ

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w 0CTFSWBCMF͸Ϧονͳ*UFSBUPSͰ͋Δɻ ίϨΫγϣϯૢ࡞

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w 0CTFSWBCMF3FDJQFSFDJQFT0CTFSWBCMFGSPN SFDJQF-JTU w 0CTFSWBCMF*OUFHFSDPVOUFS0CTFSWBCMFSBOHF w ίϨΫγϣϯΛ0CTFSWBCMFԽ QVCMJDDMBTT999"EBQUFSFYUFOET"SSBZ"EBQUFS5\ QVCMJD0CTFSWBCMF5JUFNT \ SFUVSO0CTFSWBCMF SBOHF HFU$PVOU NBQ JHFU*UFN J XJOEPX HFU$PVOU UP#MPDLJOH TJOHMF ^ ^

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͋ͱ͸ԿͰ΋΍Γ์୊ 0CTFSWBCMF3FDJQFIJTUPSZ0CTFSWBCMFGSPN IJTUPSZ-JTU 0CTFSWBCMF4USJOHJETIJTUPSZ NBQ OFX'VOD3FDJQF -POH \ !0WFSSJEF QVCMJD-POHDBMM 3FDJQFSFDJQF \ SFUVSOSFDJQFHFU*E ^ ^ MJNJU SFEVDF OFX'VOD4USJOH -POH 4USJOH \ !0WFSSJEF QVCMJD4USJOHDBMM 4USJOHT -POHJE \ SFUVSO TOVMM JEUP4USJOH ^ ^ 4USJOHJET4USJETUP#MPDLJOH TJOHMF

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ίϨΫγϣϯૢ࡞Ͱ௿ϦεΫֶश w ίϨΫγϣϯૢ࡞ʹద༻ͯ͠௿ϦεΫͰಋೖɻҰ୴ 3Y+BWBਥԽͯ͠΋࣮֐͸গͳ͍ɻ w ౷Ұతͳه๏ΛֶͿɺద༻ՕॴΛݕ౼͢Δ w Մಡੑͷߴ͍3Y+BWBίʔυΛ໛ࡧ͢Δ ྫ͑͹લทͷSFEVDF͸DPNNPOTMBOHͷ 4USJOH6UJMTKPJOΛ࢖ͬͨํ͕Α͘ͳ͍ʁͱ͔ͳΜͱ͔ w ςετίʔυ௚ॻ͖Ͱࢼ͢ͱ௙Δ

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׳Ε͖ͯͨͧɺ΋ͬͱ࣮༻ੑΛʂ

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w 0CTFSWBCMF͸1SPNJTFͰ͋Δ 1SPNJTF

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1SPNJTF͸ͭͷ஋Λ࣋ͭ 0CTFSWBCMF http://ninjinkun.hatenablog.com/entry/introrxja

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4DIFEVMFSͰεϨουΛม͑Δ result Observer 5ISFBE .BJO5ISFBE

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&SSPSIBOEMJOH Observer 5ISFBE .BJO5ISFBE

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ͭͷ஋Λ࣋ͭ0CTFSWBCMFΛ࡞Δ QVCMJD0CTFSWBCMF3FDJQFSFDJQF pOBMMPOHSFDJQF*E \ SFUVSO0CTFSWBCMFDSFBUF OFX0CTFSWBCMF0O4VCTDSJCF3FDJQF \ !0WFSSJEF QVCMJDWPJEDBMM 4VCTDSJCFS TVQFS3FDJQFTVCTDSJCFS \ USZ\ 3FDJQFSFDJQFMPBE3FDJQF SFDJQF*E TVCTDSJCFSPO/FYU SFDJQF TVCTDSJCFSPO$PNQMFUFE ^DBUDI &YDFQUJPOF \ TVCTDSJCFSPO&SSPS F ^ ^ ^ ^

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4DIFEVMFSΛηοτ͢Δ 0CTFSWBCMF3FDJQFSFDJQF0CTFSWBCMFSFDJQF JE SFDJQF0CTFSWBCMF TVCTDSJCF0O 4DIFEVMFSTJP PCTFSWF0O "OESPJE4DIFEVMFSTNBJO5ISFBE 0CTFSWBCMFͷॲཧεϨου 0CTFSWFSͷॲཧεϨου ˞"OESPJE4DIFEVMFST͸3Y"OESPJE͕ఏڙ͢ΔΫϥε

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ΤϥʔϋϯυϦϯά͢Δ SFDJQF0CTFSWBCMFTVCTDSJCF OFX"DUJPO3FDJQF \ !0WFSSJEF QVCMJDWPJEDBMM 3FDJQFSFDJQF \ TVDDFTT TIPX3FDJQF SFDJQF ^ ^ OFX"DUJPO5ISPXBCMF \ !0WFSSJEF QVCMJDWPJEDBMM 5ISPXBCMFUISPXBCMF \ FSSPS TIPX&SSPS UISPXBCMF ^ ^ OFX"DUJPO \ !0WFSSJEF QVCMJDWPJEDBMM \ DPNQMFUF IJEF1SPHSFTT ^ ^ ˞͜ΕΒ͸಺෦తʹ4VCTDSJCFSʹϥοϓ͞Ε͍ͯΔɻ௚઀4VCTDSJCFSΛ౉ͯ͠΋͍͍͕MBNCEBΛߟ͑Δͱݸผͷํ͕͍͍ͱࢥ͏

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͞Β͹"TZOD5BTL http://qiita.com/KeithYokoma/items/1120ea1aacd6841d4e4d ຋༁ʳ"TZOD5BTLͱ"TZOD5BTL-PBEFSΛSY0CTFSWBCMFʹஔ͖׵͑Δ3Y+BWB"OESPJE1BUUFSOT 4VCTDSJQUJPOTVCTDSJQUJPO4VCTDSJQUJPOTFNQUZ !0WFSSJEF QSPUFDUFEWPJEPO$SFBUF \ TVCTDSJQUJPO"OESPJE0CTFSWBCMF UIJT SFDJQF JE TVCTDSJCF0O 4DIFEVMFSTJP NBQ TVCTDSJCF ^ !0WFSSJEF QSPUFDUFEWPJEPO%FTUSPZ \ TVQFSPO%FTUSPZ TVCTDSJQUJPOVOTVCTDSJCF ^

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1SPNJTFԽͰ͞ΑͳΒ"TZOD5BTL w ͭͷ஋Λ࣋ͭ0CTFSWBCMFΛ࡞Δ w 4DIFEVMFSͰ࣮ߦεϨουΛઃఆ͢Δ w ΤϥʔϋϯυϦϯάΛ͢Δ w "TZOD5BTLͱஔ͖׵͑Δ w ςετ΋؆୯ʹॻ͚ΔΑ IUUQTZTZBHJIBUFOBCMPHDPNFOUSZ 5FTU4VCTDSJCFSΛ࢖ͬͯ3Y+BWBͷTVCTDSJCFͷςετΛॻ͘

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w ͢΂ͯ͸0QFSBUPSͷ࿈݁Ͱ͋Δ -JGU

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NBQ Recipe “Recipe” NBQ 3FDJQFΛ4USJOHʹม׵͢Δɻ ಺෦ͰԿ͕ى͖͍ͯΔʁ

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QVCMJDpOBM30CTFSWBCMF3NBQ 'VOD TVQFS5 FYUFOET3GVOD \ SFUVSOMJGU OFX0QFSBUPS.BQ GVOD ^ NBQ

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QVCMJDpOBM30CTFSWBCMF3MJGU pOBM0QFSBUPS FYUFOET3 TVQFS5MJGU \ SFUVSOOFX0CTFSWBCMF OFX0O4VCTDSJCF \ QVCMJDWPJEDBMM 4VCTDSJCFS TVQFS3P \ USZ\ 4VCTDSJCFS TVQFS5TU 4VCTDSJCFS 0CTFSWBCMFIPPLPO-JGU MJGU DBMM P USZ\ TUPO4UBSU 0CTFSWBCMFUIJTPO4VCTDSJCFDBMM TU ^ DBUDI 5ISPXBCMFF \ ུ TUPO&SSPS F ^ ^ DBUDI 5ISPXBCMFF \ ུ PPO&SSPS F ^ ^ ^ ^ MJGU ৽͍͠0CTFSWBCMFʻ3ʼΛ࡞ͬ ͯฦ͍ͯ͠Δɻ0CTFSWBCMF5 ͷߪಡऀͱͯ͠ৼΔ෣͏

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MJGU Recipe “Recipe” MJGU OFX0QFSBUPS.BQ GVOD 4VCTDSJCFS3FDJQFʹݟ͑Δ 0CTFSWBCMF4USJOHʹݟ͑Δ

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QVCMJDpOBMDMBTT0QFSBUPS.BQ5 3JNQMFNFOUT0CTFSWBCMF0QFSBUPS3 5\ ུ QVCMJD4VCTDSJCFS TVQFS5DBMM pOBM4VCTDSJCFS TVQFS3P \ SFUVSOOFX4VCTDSJCFS P \ QVCMJDWPJEPO$PNQMFUFE \ PPO$PNQMFUFE ^ QVCMJDWPJEPO&SSPS 5ISPXBCMFF \ PPO&SSPS F ^ QVCMJDWPJEPO/FYU 5U \ USZ\ PPO/FYU 0QFSBUPS.BQUIJTUSBOTGPSNFSDBMM U ^ DBUDI 5ISPXBCMFF \ &YDFQUJPOTUISPX*G'BUBM F PO&SSPS 0O&SSPS5ISPXBCMFBEE7BMVF"T-BTU$BVTF F U ^ ^ ^ ^ ^ 0QFSBUPS.BQ 'VOD5 3Λద༻ͯ͠ 4VCTDSJCFS3PO/FYU ʹ౉͠ ͍ͯΔɻ

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TVCTDSJCF0O QVCMJDpOBM0CTFSWBCMF5TVCTDSJCF0O 4DIFEVMFSTDIFEVMFS \ JG UIJTJOTUBODFPG4DBMBS4ZODISPOPVT0CTFSWBCMF \ SFUVSO 4DBMBS4ZODISPOPVT0CTFSWBCMF5 UIJT TDBMBS4DIFEVMF0O TDIFEVMFS ^ SFUVSOOFTU MJGU OFX0QFSBUPS4VCTDSJCF0O5 TDIFEVMFS ^ ͋ʂ

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TVCTDSJCF0O OFTU Recipe MJGU OFX0QFSBUPS4VCTDSJCF0O TDIFEVMFS TDIFEVMFS͕ࢦఆͨ͠εϨου ͰTVCTDSJCF ͢Δ Recipe

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$VTUPN0QFSBUPS QVCMJDJOUFSGBDF0QFSBUPS3 5 FYUFOET'VOD4VCTDSJCFS TVQFS3 4VCTDSJCFS TVQFS5\ ^ ͨͩͷ'VOD

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$VTUPN0QFSBUPS OFX0CTFSWBCMF0QFSBUPS4USJOH *OUFHFS \ !0WFSSJEF QVCMJD4VCTDSJCFS TVQFS*OUFHFSDBMM 4VCTDSJCFS TVQFS4USJOHTVCTDSJCFS \ SFUVSOOFX4VCTDSJCFS*OUFHFS \ !0WFSSJEF QVCMJDWPJEPO$PNQMFUFE \ TVCTDSJCFSPO$PNQMFUFE ^ !0WFSSJEF QVCMJDWPJEPO&SSPS 5ISPXBCMFUISPXBCMF \ TVCTDSJCFSPO&SSPS UISPXBCMF ^ !0WFSSJEF QVCMJDWPJEPO/FYU *OUFHFSJOUFHFS \ TVCTDSJCFSPO/FYU JOUFHFSUP4USJOH ^ ^ ^ ^

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4FSJBM0QFSBUPS QVCMJDDMBTT4FSJBM0QFSBUPS3 5JNQMFNFOUT0CTFSWBCMF0QFSBUPS3 5\ "DUJPO4VCTDSJCFS TVQFS3 5UIFO 5OFYU 4FSJBM0QFSBUPS "DUJPO4VCTDSJCFS TVQFS3 5UIFO \ UIJTUIFOUIFO ^ !0WFSSJEF QVCMJD4VCTDSJCFS TVQFS5DBMM pOBM4VCTDSJCFS TVQFS3TVCTDSJCFS \ SFUVSOOFX4VCTDSJCFS5 \ !0WFSSJEF QVCMJDWPJEPO$PNQMFUFE \ UIFODBMM TVCTDSJCFS OFYU ^ !0WFSSJEF QVCMJDWPJEPO&SSPS 5ISPXBCMFUISPXBCMF \ TVCTDSJCFSPO&SSPS UISPXBCMF ^ !0WFSSJEF QVCMJDWPJEPO/FYU 5U \ OFYUU ^ ^ ^ ^

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4FSJBM0QFSBUPS BQJVTFS 0CTFSWBCMF6TFS MJGU OFX4FSJBM0QFSBUPS OFX"DUJPO4VCTDSJCFS TVQFS-JTU'FFE 6TFS \ !0WFSSJEF QVCMJDWPJEDBMM 4VCTDSJCFS TVQFS-JTU'FFETVCTDSJCFS 6TFSVTFS \ BQJVTFS'FFE VTFS TVCTDSJCF TVCTDSJCFS ^ ^ TVCTDSJCF OFX"DUJPO-JTU'FFE \ !0WFSSJEF QVCMJDWPJEDBMM -JTU'FFEGFFE-JTU \ EPTPNFUIJOH ^ ^ 0CTFSWBCMF6TFSͷऔಘΛ଴ͬ ͯɺVTFS'FFEΛऔΓʹߦ͖ɺ -JTU'FFEΛऔಘ͢Δɻ

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NFSHF QVCMJDTUBUJDpOBM50CTFSWBCMF5NFSHF 0CTFSWBCMF FYUFOET0CTFSWBCMF FYUFOET5TPVSDF \ SFUVSOTPVSDFMJGU OFX0QFSBUPS.FSHF ^

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NFSHF ࣌ؒ࣠͝ͱϚʔδɻͭ·ΓύϥϨϧ

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NFSHFΛ࢖ͬͨฒྻϦΫΤετ -JTU0CTFSWBCMF#PPMFBOPCTFSWBCMFTOFX"SSBZ-JTU PCTFSWBCMFTBEE SFDJQF 0CTFSWBCMF3FDJQF EP0O/FYU OFX"DUJPO3FDJQF \ !0WFSSJEF QVCMJDWPJEDBMM 3FDJQFSFDJQF \ TVDDFTT ^ ^ JT&NQUZ PCTFSWBCMFTBEE VTFS 0CTFSWBCMF6TFS EP0O/FYU OFX"DUJPO6TFS \ !0WFSSJEF QVCMJDWPJEDBMM 6TFSVTFS \ TVDDFTT ^ ^ JT&NQUZ 0CTFSWBCMF#PPMFBOQBSBMMFM0CTFSWBCMFNFSHF PCTFSWBCMFT

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NFSHFΛ࢖ͬͨฒྻϦΫΤετ QBSBMMFMTVCTDSJCF OFX"DUJPO#PPMFBO \ !0WFSSJEF QVCMJDWPJEDBMM #PPMFBOB#PPMFBO \ શ෦੒ޭ ^ ^ OFX"DUJPO5ISPXBCMF \ !0WFSSJEF QVCMJDWPJEDBMM 5ISPXBCMFUISPXBCMF \ ͍ͣΕ͔͕ࣦഊ ^ ^ ύϥϨϧʹ"1*ୟ͍ͯ଴ͪ߹Θͤͱ͔

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w શ෦0QFSBUPSͷ࿈݁ͩɻڪΖ͘͠ෳࡶͳʜ w ιʔεΛಡΉΜͩɻ w ॊೈʹͳΜͰ΋ߏஙՄೳͳͷͰઃܭ͕೉͍͠ w ૬ஊ͍ͨ͠ શ෦0QFSBUPS

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w 4VCKFDU͸0CTFSWFSͰ͋Γ0CTFSWBCMFͰ͋Δ 4VCKFDU

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w όΠύεͷΠϝʔδ͔ͳʔʁ 4VCKFDU Recipe “Recipe” 4VCKFDU

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w 3Y"OESPJE'SBNFXPSLͷ3Y"DUJWJUZ΍ -JGFDZDMF0CTFSWBCMF w 4VCKFDUΛ࢖ͬͨ-JTU7JFXͷ௥ՃಡΈࠐΈ൑ఆ w &WFOU#VT 4VCKFDU