Fat Modelに対処する 6つのリファクタリングパターン

'BU.PEFMʹରॲ͢Δ ͭͷϦϑΝΫλϦϯάύλʔϯ ,BPSV)PUBUF!QVSVOLBPSV .FE1FFS3VCZPO3BJMT&OHJOFFS େࡕ3VCZ,BJHJ PTSL

อཱ֜ ,BPSV)PUBUF !QVSVOLBPSV ੜ·ΕͯॳΊͯ େࡕʹདྷ·ͨ͠ʂ ࣗݾ঺հ

'BU.PEFMͱ͸ DMBTT"SUJDMF"QQMJDBUJPO3FDPSE ͨ͘͞Μͷؔ࿈෇͚ IBT@NBOZDPNNFOUT CFMPOHT@UPDBUFHPSZ ͨ͘͞Μͷείʔϓ TDPQFQVCMJTIFE \ ^
ͨ͘͞Μͷϝιου EFGQVCMJTIFE FOE FOE

"QQMJDBUJPO3FDPSEΛܧঝͨ͠Ϋϥε͕ ศརϝιουूʹͳΔ 'BU.PEFMͰਏ͍͜ͱ मਖ਼ൣғͷಛఆʹ͕͔͔࣌ؒΔ ςετ͕ॻ͖ͮΒ͍ ͓·͡ͳ͍͕ॻ͔Ε͍ͯΔ SVCPDPQEJTBCMF

'BU.PEFMʹͳͬͯ͠·͏ ٕज़తͳ໰୊ ࣌ؒɾ޻਺ͷ໰୊ 'BU.PEFMͰ΋Α͍ :"(/*ɾ,*44 'BU$POUSPMMFSʹൺ΂ͨΒ༏ઌ౓͕௿͘ͳΔ 'BU.PEFM͕ى͖Δɾ์ஔ͞ΕΔཧ༝

'BU.PEFMʹͳͬͯ͠·͏ ٕज़తͳ໰୊ ࣌ؒɾ޻਺ͷ໰୊ ύλʔϯԽɾٕज़ྗͷ޲্ 'BU.PEFMͰ΋Α͍ :"(/*ɾ,*44 'BU$POUSPMMFSʹൺ΂ͨΒ༏ઌ౓͕௿͘ͳΔ ϦϑΝΫλϦϯάͷश׳ 'BU.PEFMΛى͜͞ͳ͍ͨΊʹ͸ʁ

໰୊ΛఆܕԽͯ͠ଊ͑ΒΕΔ ղܾࡦΛ٬؍తʹൺֱͰ͖Δ ϝϯόʔͷڞ௨ݴޠͱͳΔ ύλʔϯԽͷϝϦοτ ʮJ04ΞϓϦઃܭύλʔϯʯୈষઃܭ͢Δͱ͍͏͜ͱΑΓ

ϋϯϚʔఝප ϋϯϚʔͷ࢖͍ํΛ֮͑ͨΒɺશ෦ఝʹݟ͑Δ ύλʔϯԽͷσϝϦοτɾ஫ҙ఺

ۜͷ஄ؙͰ͸ͳ͍ ଞͷύλʔϯ΋͋Δ͸ͣ ࠙਌ձ΍5XJUUFSͰڞ༗ͯ͠΋Β͑Δͱخ͍͠ʂ ࠓ೔࿩͢͜ͱ͸ਖ਼ղͰ͸ͳ͍Ͱ͢

ύλʔϯԽͷલʹɾɾɾ

'BU.PEFM΁ͷҙࣝͷ౷Ұ νʔϜͰཧ࿦ʹ͍ͭͯษڧ ໋໊ϧʔϧͷ࡞੒ ύλʔϯԽͷલʹνʔϜͰ΍ͬͨ͜ͱ

όάΛੜΈ΍͍͢ɾςετ͕ॻ͖ͮΒ͍৔߹ͷΈղফ͢Δ ʢඞཁ͕ͳ͚Ε͹ϦϑΝΫλϦϯάΛ͠ͳ͍ʣ 'BU.PEFM΁ͷҙࣝͷ౷Ұ طଘͷίʔυʹରͯ͠मਖ਼͢Δ৔߹͸ ϦϑΝΫλϦϯά΋ҰॹʹͰ͖ͳ͍͔ߟ͑ͯݟੵ΋Γ͢Δ

νʔϜͰཧ࿦ʹ͍ͭͯษڧ ΦϒδΣΫτࢦ޲ઃܭʹ͍ͭͯ ॻ੶ΛಡΜͰཧղΛਂΊΔ

ॲཧΛ੾Γग़͢͜ͱʹͳΔΫϥεΛ෼ྨ͠ɺ ಛఆͷ໋໊ɾωʔϜεϖʔεʹͳΔΑ͏ϧʔϧΛ࡞੒ ໋໊ϧʔϧͷ࡞੒ αʔϏεͷํ޲ʹΑͬͯมΘΔՄೳੑ΋͋ΔͨΊɺ ԾͰܾΊΔ͘Β͍ͷҐஔ͚ͮ

$PMMFDUPS0CKFDUΛ࢖͏ 7BMVF0CKFDUΛ࢖͏ 1PMJDZ0CKFDUΛ࢖͏ 2VFSZ#VJMEFSΛ࢖͏ 7BMJEBUPS$MBTTΛ࢖͏ ΦϒδΣΫτΛ૿΍ͯ͠ΦϒδΣΫτ಺ͷ෼ذΛݮΒ͢ ϦϑΝΫλϦϯάύλʔϯ

$PMMFDUPS0CKFDUΛ࢖͏ 1

ϦϑΝΫλϦϯάલͷίʔυྫʢهࣄͷҰཡը໘ʣ $PMMFDUPS0CKFDU DMBTT"SUJDMFT$POUSPMMFS"QQMJDBUJPO$POUSPMMFS EFGJOEFY !BSUJDMFT"SUJDMFQVCMJTIFE QBHF QBSBNT<QBHF> QFS
FOE FOE GJMUFSFE@CZ@DBUFHPSZ QBSBNT<DBUFHPSZ> PSEFSFE@CZ QBSBNT<PSEFS>

DMBTT"SUJDMF"QQMJDBUJPO3FDPSE CFMPOHT@UPDBUFHPSZ TDPQFGJMUFSFE@CZ@DBUFHPSZ DBUFHPSZ \ JGDBUFHPSZ KPJOT DBUFHPSZ NFSHF
$BUFHPSZXIFSF OBNFDBUFHPSZ FOE ^ FOE ϦϑΝΫλϦϯάલͷίʔυྫʢهࣄΫϥεʣ $PMMFDUPS0CKFDU

ݱঢ়ͷ໰୊఺ $PMMFDUPS0CKFDU ݕࡧ৚͕݅૿͑Δͨͼʹ.PEFMʹTDPQFΛ௥Ճ ෳ਺ͷը໘͔Βผͷ৚݅ʹΑΔݕࡧ͕͋Δ৔߹ɺ ͭͷ.PEFMʹશͯهࡌ͢Δ ଠΓ΍͍͢ମ࣭Ͱ͢

$PMMFDUPS0CKFDUΛ࢖͏ 1

ϦϑΝΫλϦϯάલ $PMMFDUPS0CKFDU "SUJDMFT$POUSPMMFS "SUJDMF "SUJDMFT$POUSPMMFS "SUJDMF'JMUFSJOH "SUJDMFT$PMMFDUPS "SUJDMF0SEFSJOH ϦϑΝΫλϦϯάޙ ϑΟϧλϦϯάΛ୲౰
ιʔτΛ୲౰

"SUJDMFT$POUSPMMFS"SUJDMFT$PMMFDUPS"SUJDMF'JMUFSJOH $PMMFDUPS0CKFDU DMBTT"SUJDMFT$POUSPMMFS"QQMJDBUJPO$POUSPMMFS EFGJOEFY !BSUJDMFT"SUJDMFT$PMMFDUPSOFX QBSBNTQBSBNT DBMM FOE FOE

DMBTT"SUJDMFT$PMMFDUPS EFGJOJUJBMJ[F QBSBNT !QBSBNTQBSBNT FOE EFGDBMM BSUJDMFT"SUJDMFQVCMJTIFE BSUJDMFTGJMUFSJOHDBMM
BSUJDMFT BSUJDMFTPSEFSJOHDBMM BSUJDMFT BSUJDMFTQBHF QBSBNT<QBHF> QFS FOE "SUJDMFT$POUSPMMFS"SUJDMFT$PMMFDUPS"SUJDMF'JMUFSJOH $PMMFDUPS0CKFDU QSJWBUF BUUS@SFBEFSQBSBNT EFGGJMUFSJOH "SUJDMF'JMUFSJOHOFX QBSBNTQFSNJU DBUFHPSZ FOE

DMBTT"SUJDMF'JMUFSJOH JODMVEF"DUJWF.PEFM.PEFM BUUS@BDDFTTPSDBUFHPSZ WBMJEBUFTDBUFHPSZ TPNFUIJOH@SVMF EFGDBMM SFTPVSDFT SFUVSOSFTPVSDFTJGDBUFHPSZCMBOL
KPJOT DBUFHPSZ NFSHF $BUFHPSZXIFSF OBNFDBUFHPSZ FOE FOE "SUJDMFT$POUSPMMFS"SUJDMFT$PMMFDUPS"SUJDMF'JMUFSJOH $PMMFDUPS0CKFDU

վળ݁Ռ $PMMFDUPS0CKFDU ݕࡧ৚͕݅૿͑ͯ΋ݕࡧ৚݅Λ؅ཧ͢Δ 'JMUFSJOHΫϥεʹίʔυΛ૿΍͢ 4Λ࣮ݱ ෳ਺ͷը໘͔Βผͷ৚݅ʹΑΔݕࡧ͕͋Δ৔߹ɺ ͦΕͧΕຖͷը໘༻ͷ$PMMFDUPSɾ'JMUFSJOHΫϥεʹ࣮૷ *Λ࣮ݱ

7BMVF0CKFDUΛ࢖͏ 2

DMBTT"DDPVOU"QQMJDBUJPO3FDPSE EFGUFM <UFM UFM UFM>KPJO FOE EFGUFM@XJUI@IZQIFO
<UFM UFM UFM>KPJO FOE EFGUFM@XJUI@IZQIFO@DPOWFSUFE@GVMM@XJEUI <UFM UFM UFM>KPJO US ̌̕ FOE FOE ϦϑΝΫλϦϯάલͷίʔυྫ 7BMVF0CKFDU

ݱঢ়ͷ໰୊఺ 7BMVF0CKFDU UFM͸ɺ൚༻తʹ࢖ΘΕΔ಺༰ͳͷͰɺՕॴʹ·ͱΊ͍ͨ ݱ࣮ੈքͰ͸ɺGBY΋ඞཁͩͬͨ

मਖ਼ํ๏ 7BMVF0CKFDU DPODFSOʹ੾Γग़͢ IFMQFSʹ੾Γग़͢ NPEFMʹ੾Γग़͢

IFMQFSΑΓ͸NPEFMʹ੾Γग़͍ͨ͠ 7BMVF0CKFDU DMBTT"DDPVOU"QQMJDBUJPO3FDPSE 7"-*%@5&-@-&/(5)< > WBMJEBUFGPSNBU@UFM@OVNCFS EFGGPSNBU@UFM@OVNCFS UFM<UFM UFM
UFM>KPJO 7"-*%@5&-@-&/(5)JODMVEF UFMMFOHUI FOE FOE

7BMVF0CKFDUΛ࢖͏ 2

DMBTT5FM BUUS@BDDFTTPSOVNCFS EFGJOJUJBMJ[F BSFB@DPEF DJUZ@DPEF EJSFDUPSZ@DPEF !OVNCFS<BSFB@DPEF DJUZ@DPEF
EJSFDUPSZ@DPEF>KPJO FOE FOE ి࿩൪߸ΫϥεΛ࡞੒ 7BMVF0CKFDU

DMBTT"DDPVOU"QQMJDBUJPO3FDPSE DPNQPTFE@PGUFM DMBTT@OBNF5FM NBQQJOH< <UFM DJUZ@DPEF> <UFM BSFB@DPEF>
<bUFM EJSFDUPSZ@DPEF> > WBMJEBUFGPSNBU@UFM@OVNCFS EFGGPSNBU@UFM@OVNCFS 7"-*%@5&-@-&/(5)JODMVEF UFMOVNCFSMFOHUI FOE FOE 7BMVF0CKFDU DPNQPTFE@PGΛ࢖ͬͯ7BMVF0CKFDUΛݺͼग़͢

DPNQPTFE@PGUFM DMBTT@OBNF5FM NBQQJOH<<UFM DJUZ@DPEF>ʜ> EFGUFM 5FMOFX DJUZ@DPEFUFM ʜ FOE
7BMVF0CKFDU DPNQPTFE@PGͱ͸

1PMJDZ0CKFDUΛ࢖͏ 3

DMBTT"SUJDMF"QQMJDBUJPO3FDPSE EFGFEJUJOH EFMFUFE QVCMJTIFE@BUCMBOL ccQVCMJTIFE@BU%BUF5JNFOPX FOE
EFGXBJU@SFWJFX EFMFUFEQVCMJTIFE@BUQVCMJTIFE@BU%BUF5JNFOPX SFWJFXFE FOE EFGQVCMJTIFE FOE ϦϑΝΫλϦϯάલͷίʔυྫ 1PMJDZ0CKFDU

ݱঢ়ͷ໰୊఺ 1PMJDZ0CKFDU ϏδωεϩδοΫ͕"3Λܧঝͨ͠Ϋϥεʹॻ͔Ε͍ͯΔ ݟ௨͕͠ѱ͘ͳΔ

1PMJDZ0CKFDUΛ࢖͏ 3

DMBTT"SUJDMF1PMJDZ EFGJOJUJBMJ[F BSUJDMF !BSUJDMFBSUJDMF FOE EFGFEJUJOH !BSUJDMFEFMFUFE
!BSUJDMFQVCMJTIFE@BUCMBOL cc !BSUJDMFQVCMJTIFE@BU%BUF5JNFOPX FOE FOE ෳ਺Ϩίʔυͷ7BMJEBUJPO΋੾Γग़ͤΔ 1PMJDZ0CKFDU

2VFSZ#VJMEFSʹ੾Γग़͢ 4

DMBTT"SUJDMF"QQMJDBUJPO3FDPSE TDPQFTDPQF@CZ@NBOZ@DPOEJUJPO@DPMVNOT QBSBNT \ XIFSF ৚݅" PS
XIFSF ৚݅# XIFSFOPU ৚݅$ ^ FOE ϦϑΝΫλϦϯάલͷίʔυྫ 2VFSZ#VJMEFS

ݱঢ়ͷ໰୊఺ 2VFSZ#VJMEFS TDPQFͷݟ௨͕͠ѱ͍ TDPQFͷதͰɺ3FMBUJPO$IBJO͍ͯ͠ΔՕॴΛ ৼΔ෣͍͝ͱʹॲཧΛ෼͚͍ͨ ผͷTDPQFʹ੾Γग़͢ͱɺେྔͷTDPQF͕Ͱ͖Δ

2VFSZ#VJMEFSʹ੾Γग़͢ 4

DMBTT"SUJDMF)PHF2VFSZ#VJMEFS EFGJOJUJBMJ[F QBSBNT !QBSBNTQBSBNT FOE EFGDBMM GPS@DPOEJUJPO@B PS
GPS@DPOEJUJPO@C@D FOE FOE "SUJDMF"SUJDMF)PHF2VFSZ#VJMEFS 2VFSZ#VJMEFS QSJWBUF EFGGPS@DPOEJUJPO@B "SUJDMFXIFSF ৚݅" FOE EFGGPS@DPOEJUJPO@C@D "SUJDMFXIFSF ৚݅# XIFSFOPU ৚݅$ FOE ͜͜͸ద੾ͳϝιου໊ʹ͢Δ

DMBTT"SUJDMF"QQMJDBUJPO3FDPSE TDPQFTDPQF@CZ@NBOZ@DPOEJUJPO@DPMVNOT QBSBNT \ "SUJDMF)PHF2VFSZ#VJMEFSOFX QBSBNTQBSBNT DBMM ^ FOE
"SUJDMF"SUJDMF)PHF2VFSZ#VJMEFS 2VFSZ#VJMEFS

7BMJEBUPS$MBTTΛ࢖͏ 5

DMBTT6TFS"QQMJDBUJPO3FDPSE WBMJEBUFLBOB@OBNF@TIPVME@POMZ@LBUBLBOB QSJWBUF EFGLBOB@OBNF@TIPVME@POMZ@LBUBLBOB SFUVSOJGLBOB@OBNFNBUDI ,"5","/"@3&(&9 FSSPSTBEE LBOB@OBNF
͕ෆਖ਼ͳܗࣜͰ͢ FOE FOE ϦϑΝΫλϦϯάલͷίʔυྫ 7BMJEBUPS$MBTT

ݱঢ়ͷ໰୊఺ 7BMJEBUPS$MBTT ֤Ϋϥεͷதʹॻ͘ͱɺڞ௨ԽͰ͖ͳ͍ 7BMJEBUJPOࣗମͷॲཧ͕ଟ͍ͱɺ .PEFMͷݟ௨͕͠ѱ͘ͳΔ

7BMJEBUPS$MBTTΛ࢖͏ 5

DMBTT6TFS"QQMJDBUJPO3FDPSE WBMJEBUFTLBOB@OBNF LBUBLBOBUSVF FOE DMBTT,BUBLBOB7BMJEBUPS"DUJWF.PEFM&BDI7BMJEBUPS EFGWBMJEBUF@FBDI SFDPSE BUUSJCVUF WBMVF
SFUVSOJGWBMVFNBUDI ,"5","/"@3&(&9 SFDPSEFSSPSTBEE LBOB@OBNF ͕ෆਖ਼ͳܗࣜͰ͢ FOE FOE ,BUBLBOB7BMJEBUPSΫϥεʹ੾Γग़͢ 7BMJEBUPS$MBTT

DMBTT6TFS"QQMJDBUJPO3FDPSE WBMJEBUFT@XJUI%BUF7BMJEBUPS FOE DMBTT%BUF7BMJEBUPS"DUJWF.PEFM7BMJEBUPS EFGWBMJEBUF SFDPSE EBUF%BUFQBSTF SFDPSEZFBS
SFDPSENPOUI SFDPSEEBZ SFTDVF"SHVNFOU&SSPS SFDPSEFSSPSTBEE CBTF ͕ਖ਼͋͘͠Γ·ͤΜ FOE FOE ෳ਺ଐੑͷ7BMJEBUJPO΋੾Γग़ͤΔ 7BMJEBUPS$MBTT

ΦϒδΣΫτΛ૿΍ͯ͠ ΦϒδΣΫτ಺ͷ෼ذΛݮΒ͢ 6

DMBTT"SUJDMF$SFBUPS FOVNCZ<VTFS BENJO> EFGTBWF QBSBNT CZCZ BSUJDMF"SUJDMFOFX QBSBNT
BSUJDMFTBWF Ϣʔβʔ͕࡞੒ͨ͠৔߹ɺطಡऀ؅ཧςʔϒϧʹ*/4&35͢Δ BSUJDMFWJFXFSTDSFBUF VTFSBSUJDMFPXOFS JGCZVTFS FOE FOE ϦϑΝΫλϦϯάલͷίʔυྫ ΦϒδΣΫτΛ૿΍ͯ͠෼ذΛݮΒ͢

ݱঢ়ͷ໰୊఺ ΦϒδΣΫτΛ૿΍ͯ͠෼ذΛݮΒ͢ FOVNCZ\VTFS BENJO^ͷ߲໨͕૿͑ͨ࣌ʹɺ ʮ˓˓ͷ͚࣮࣌ͩߦʯͷ෼ذ͕૿͑Δ ͦͷ෼ςετ΋૿͑Δ

ΦϒδΣΫτΛ૿΍ͯ͠ ΦϒδΣΫτ಺ͷ෼ذΛݮΒ͢ 6

DMBTT"SUJDMF$SFBUPS FOVNCZ<VTFS BENJO> EFGTBWF QBSBNT CZCZ BSUJDMF"SUJDMFOFX QBSBNT
BSUJDMFTBWF Ϣʔβʔ͕࡞੒ͨ͠৔߹ɺطಡऀ؅ཧςʔϒϧʹ*/4&35͢Δ BSUJDMFWJFXFSTDSFBUF VTFSBSUJDMFPXOFS JGCZVTFS FOE FOE ϦϑΝΫλϦϯάલͷίʔυྫ ΦϒδΣΫτΛ૿΍ͯ͠෼ذΛݮΒ͢ FOVNͷΞΠςϜ਺͚ͩ ΫϥεΛ࡞Δ

DMBTT"SUJDMF$SFBUPS#Z6TFS EFGTBWF QBSBNT TBWF@CZ@VTFSͷ಺༰͕ೖΔ FOE FOE 6TFS͕هࣄΛ࡞੒͢Δ$SFBUPSΫϥε ΦϒδΣΫτΛ૿΍ͯ͠෼ذΛݮΒ͢

मਖ਼݁Ռ ΦϒδΣΫτΛ૿΍ͯ͠෼ذΛݮΒ͢ ʮ˓˓ͷ͚࣮࣌ͩߦʯͷ෼ذ͕૿͑Δ ͦͷ෼ςετ΋૿͑Δ ʮ˓˓ͷ͚࣮࣌ͩߦʯͷ˓˓͝ͱʹΫϥε͕࡞ΒΕΔ ෼ذ͕গͳ͍ͷͰɺςετίʔυͷ਺΋ݮΔ 40-*%ݪଇͷ4ͱ0Λ࣮ݱ

·ͱΊʢ͕࣌ؒ͋Ε͹ɾɾɾʣ

w ύλʔϯԽ͢ΔϝϦοτ w ύλʔϯͷదԠલʹνʔϜͰ΍Δ΂͖͜ͱ w ύλʔϯͷ঺հ ·ͱΊ

໰୊ΛఆܕԽͯ͠ଊ͑ΒΕΔ ղܾࡦΛ٬؍తʹൺֱͰ͖Δ ϝϯόʔͷڞ௨ݴޠͱͳΔ ύλʔϯԽͷϝϦοτ ʮJ04ΞϓϦઃܭύλʔϯʯୈষઃܭ͢Δͱ͍͏͜ͱΑΓ

'BU.PEFM΁ͷҙࣝͷ౷Ұ νʔϜͰཧ࿦ʹ͍ͭͯษڧ ໋໊ϧʔϧͷ࡞੒ ύλʔϯͷదԠલʹνʔϜͰ΍Δ΂͖͜ͱ

$PMMFDUPS0CKFDUΛ࢖͏ 7BMVF0CKFDUΛ࢖͏ 1PMJDZ0CKFDUΛ࢖͏ 2VFSZ#VJMEFSΛ࢖͏ 7BMJEBUPS$MBTTΛ࢖͏ ΦϒδΣΫτΛ૿΍ͯ͠ΦϒδΣΫτ಺ͷ෼ذΛݮΒ͢ ϦϑΝΫλϦϯάύλʔϯ

w 1BUUFSOTUP3FGBDUPS'BU"DUJWF3FDPSE.PEFMT IUUQTDPEFDMJNBUFDPNCMPHXBZTUPEFDPNQPTFGBUBDUJWFSFDPSE NPEFMT w 3BJMTͷϑΝοτϞσϧ໰୊ʹରॲ͢ΔલʹಡΜͰ΄͍͠هࣄ IUUQTRJJUBDPNLMSJVUTBJUFNTEGDDBG w 3BJMTͰ΍ͬͯ͠·͍͕ͪͳอकੑΛԼ͛ͯ͠·͏ίʔυͱͦͷղܾࡦ IUUQTRJJUBDPNTIVOIJLJUBJUFNTGECEDFDGD
w J04ΞϓϦઃܭύλʔϯೖ໳ IUUQTQFBLTDDCPPLTJ04@BSDIJUFDUVSF w 4BOEJ.FU[ΦϒδΣΫτࢦ޲ઃܭ࣮ફΨΠυd3VCZͰΘ͔ΔਐԽ͚ͭͮ͠Δॊೈ ͳΞϓϦέʔγϣϯͷҭͯํ w 3PCFSU$.BSUJO$MFBO"SDIJUFDUVSFୡਓʹֶͿιϑτ΢ΣΞͷߏ଄ͱઃܭ ࢀߟจݙ

͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠

Fat Modelに対処する 6つのリファクタリングパターン

Fat Modelに対処する 6つのリファクタリングパターン

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Fat Modelに対処する 6つのリファクタリングパターン

Fat Modelに対処する 6つのリファクタリングパターン