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Javaユーザに伝えたいGuava Cache入門
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Hiroto YAMAKAWA
January 15, 2017
Technology
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Javaユーザに伝えたいGuava Cache入門
Java Do #08
https://javado.connpass.com/event/47668/
Hiroto YAMAKAWA
January 15, 2017
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Transcript
!HJTIJ@ZBNB +BWBϢʔβʹ͍͑ͨ (VBWB$BDIFೖ
IUUQTDPEFSEPKPTBQQPSPDPOOQBTTDPNFWFOU
&BSMZ IUUQXXXUPPDPNTVQQPSUBQQMFOFXTIUNM জᢣᦍᣀ
όεϩέʔγϣϯγεςϜͷ։ൃʹͯ ᣪఞⷭӒҵヹ➥ᕕӒҵѬᥥ㛯ᏌҶ৵ҮԯդԧӼ Ტ༪%#ҵӳ4FMFDUҿӅӵԛԡӬӍӉҮӔҮӲҰӔҶӃӵ ȤѫԕՋԫԟՍӁӐөӵҵ
ǖ +BWBӘԕՋԫԟՍՑԌԾՑՒ (PPHMFӘ+BWB᳣⇹ՑԌԾՑՒ(VBWBӘकᮿ⥎㮣 ǖ ⼀ᇰԽԉԌՓՔԡ㮢ԛդԱञӑ⼀ᇰ㮣ӑಌਃ ǖ IUUQTHJUIVCDPNHPPHMFHVBWBXJLJ$BDIFT&YQMBJOFE ǖ NBWFO (VBWB$BDIF
EFQFOEFODZ HSPVQ*EDPNHPPHMFHVBWBHSPVQ*E BSUJGBDU*EHVBWBBSUJGBDU*E WFSTJPOWFSTJPO EFQFOEFODZ
αϯϓϧɿΩʔΛ༩͑ΔͱࣗಈతʹΩϟογϡσʔλΛੜ LoadingCache<String, Integer> randomIntCache = CacheBuilder.newBuilder() .expireAfterWrite(5, TimeUnit.SECONDS) .build(new CacheLoader<String,
Integer>() { @Override public Integer load(String key) throws Exception { return getRandomInt(); } }); HFU ǒGPPǒ ӑѬMPBE ǒGPPǒ Әᇴ✿᧠ӼǒGPPǒӒҮҰԕդӑԕՋԫԟՍӃӵѭ ⓬ᒁӉӍӉӳѬԕՋԫԟՍӁӉԌ՛ԡԧ՛ԡӼ⏺᪨Ӄӵ Integer v1 = randomIntCache.get(”foo”); ← (1) loadϝιουΛ࣮ߦ͠ɺ݁ՌΛΩϟογϡ Integer v2 = randomIntCache.get(”foo”); ← (2) (1)ͷ࣮ߦ݁Ռͱશ͘ಉ͡ΠϯελϯεΛฦ͢
LoadingCache<String, Integer> randomIntCache = CacheBuilder.newBuilder() .expireAfterWrite(5, TimeUnit.SECONDS) .build(new CacheLoader<String, Integer>()
{ @Override public Integer load(String key) throws Exception { return getRandomInt(); } }); ԕՋԫԟՍӘ⻎ᠶᦴঽӔӓ LFZ 7BMVF ԕՋԫԟՍӃӵ7BMVFྞԌ՛ԡԧ՛ԡӘ⇰ᘻᢅᴿѭ,FZӼਜӍӉⅈӑ⇰ᘻӬ൧⥎ѭ ,FZ 7BMVFәԗՑԡѭ $BDIF-PBEFSәѬ,FZҾӒӕԕՋԫԟՍӃӵ7BMVFԌ՛ԡԧ՛ԡӘ⇰ᘻᢅᴿӼఙᒐӃӵѭ ԕՋԫԟՍӘ⻎ᠶᦴঽӔӓә⹋ᡔ⼀ᇰӑҷӵѭ㮢ఙ㖟ᣪ㔿ѬԕդӘᡔӔӓ㮣 $BDIF-PEFSӼ ਜҰӒҷә -PBEJOH$BDIF αϯϓϧɿΩʔΛ༩͑ΔͱࣗಈతʹΩϟογϡσʔλΛੜ LFZ 7BMVF LFZ 7BMVF
αϯϓϧɿΩʔΛ༩͑ΔͱࣗಈతʹΩϟογϡσʔλΛੜ LoadingCache<String, Integer> randomIntCache = CacheBuilder.newBuilder() .expireAfterWrite(5, TimeUnit.SECONDS) .build(CacheLoader.from(() ->
getRandomInt())); +BWBӘMBNCEBᐛ㮢'VODUJPO 4VQQMJFS㮣ӼਜӍӐ$BDIF-PBEFSӼਃӶӵѭѫ 'VODUJPO LFZ LFZӼਜҰⅈ 4VQQMJFS LFZӼਜӹӔҮⅈ -BNCEBᐛӼਜҰ൶Ѭ&YDFQUJPOҶԡՕդҿӶӔҮӘӑѬHFU6ODIFDLFE ,FZ ӼਜҰѭ 㮢⼳✦әᒁ㈨ѭӉӊӁHFUӘӨӨӑӬහӝ௲ӁӕਦႌⅈҶᒨ⺙ӔҽӒলႌәใ㛸әᾩҮ㮣 Integer v1 = randomIntCache.getUnchecked(”foo”); ← ExceptionͷνΣοΫΛ͠ͳ͍߹ Integer v2 = randomIntCache.getUnchecked(”foo”);
ΩϟογϡͰ͖Δσʔλͷߏɿ&OUSZ ,FZԌ՛ԡԧ՛ԡ 7BMVFԌ՛ԡԧ՛ԡ Ǒ"ǒ ǑҴәӲҰǒ Ǒ#ǒ ǑҽӽӕӋәǒ Ǒ$ǒ ǑҿӲҰӔӳǒ ,FZԌ՛ԡԧ՛ԡ
7BMVFԒԾԠԏԗ ǑBǒ ǑCǒ ǑDǒ ǑFǒ ǑGǒ ǑHǒ ǑIǒ ǑJǒ ǑKǒ ,FZԌ՛ԡԧ՛ԡ㮴7BMVFԌ՛ԡԧ՛ԡӘՂԊӼԐ՛ՒӒӁӐᩈ✊ӑҷӵѭ 㮢.BQӒൺӂ㮣 ȔԐ՛Ւ
ΤϯτϦͷഁغ݅ɿ&WJDUJPO ǖ FYQJSF"GUFS8SJUF MPOHEVSBUJPO 5JNF6OJUVOJU Ԑ՛ՒӼਃᘻӁӐҵӳ⏺᪨ҿӶӵӨӑӘᦆ㖟ѭ ǖ FYQJSF"GUFS"DDFTT MPOHEVSBUJPO
5JNF6OJUVOJU Ԑ՛ՒӕᥰᒁӘԊԗԣԡҶҬӍӐҵӳ⏺᪨ҿӶӵӨӑӘᦆ㖟ѭ ǖ NBYJNVN4J[F MPOHTJ[F Ԑ՛ՒӼᛝӃӵᡔѭᛡᇰᡔলञӘԐ՛ՒᡔӕӔӵӒѬ'*'0ӑ⏺᪨ѭ ǖ NBYJNVN8FJHIU㮢MPOHTJ[F Ԑ՛ՒӼᛝӃӵᡔѭৼҵҶᛡᇰলञӘᡔӕӔӵӒѬ'*'0ӑ⏺᪨ѭ ѷৼҵѸӘ☑௲ՓդՓә8FJHIFSԒԾԠԏԗӑḉӃѭ 㮢ਦҲӚѬԕՋԫԟՍӃӵ7BMVFӘ➜൶ᡡᆻᡔѬ-JTUᡔӔӓ㮣
ΤϯτϦͷഁغ݅ɿ3FGSFTI ǖ SFGSFTI"GUFS8SJUF MPOHEVSBUJPO 5JNF6OJUVOJU Ԑ՛ՒӼਃᘻӁӐҵӳӉӕ7BMVFӼᥥӁ⍃ӃӨӑӘᦆ㖟ѭ FYQJSF9999ӒӘ㉹Ү㮴 FYQJSFәѬᦴঽӼṅӉӃӒԐ՛ՒӼ⏺᪨Ӄӵ
⏺᪨ӘҬӒѬൺӂԕդӑHFUҿӶӵӒѬ7BMVFҶṍ૨ҿӶӵӨӑ⽠ө㈆өᑻӋӕӔӵ SFGSFTIәѬԕդӕሽӁӐӁҮ7BMVFӼṍ૨ӃӵӨӑѬ൜Ү7BMVFӼ㈘Ӂ❰һӵ 㮢⽠ө㈆өᑻӋӕӁӔҮ㮣
ͦͷ΄͔ͷઃఆɿΨϕʔδίϨΫγϣϯͱͷ݉Ͷ߹͍ ǖ TPGU7BMVFT WBMVFӼ4PGU3FGFSFODFӕӃӵ ǖ XFBL,FZT ,FZӼ8FBL3FGFSFODFӕӃӵ ǖ
XFBL7BMVFT WBMVFӼ8FBL3FGFSFODFӕӃӵ ԕդӬӁҹә7BMVFӼᐹീ῍㮢($ҿӶӮӃҹ㮣ӕӃӵѭ 8FBLӒ4PGUӘ㉹ҮәতӘねᡭӔӓӕ⽟ᣀӼӴӉҮҶѬ Ԍ՛ԡԧ՛ԡҶീ῍ҿӶӔҹӔӍӉ㗖Ә($ҿӶӮӃҿӒ⢰ҲӶӚӲҮ 㮢8FBLӘᢅҶ($ҿӶӮӃҹѬ4PGUӘᢅҶԕՋԫԟՍൿҷ㮣
αϯϓϧɿࣗͰΤϯτϦΛొ͢Δ Cache<String, Integer> origCache = CacheBuilder.newBuilder() .expireAfterWrite(5, TimeUnit.SECONDS) .build(); ⧞ಌ⋵ӕ7BMVFӼՕդԱӁӔҮ$BDIFԌ՛ԧդԽԏդԡྞӘԕՋԫԟՍӼਃӴѬ
QVU LFZ 7BMVF㮣ӑѬ⧞ӑԐ՛ՒӼ⋭㑤ӃӵҽӒӬӑҷӵ &YQJSFӔӓӘ⼀ᇰӬ-PBEJOH$BDIFൺ᭦ѭ origCache.put(”foo”, 1); origCache.put(”bar”, 2); Integer v1 = origCache.getIfPresent(”foo”); $BDIF-PEFSӼਜӹӔҮӒҷә$BDIF
ΤϯτϦͷഁغɿJOWBMJEBUF $BDIF-PBEJOH$BDIFӘႁᡔӕᇴӑҷӵ ǖ JOWBMJEBUF LFZ ᛡᇰҿӶӉԕդӘԐ՛ՒӼ⏺᪨Ӄӵ ǖ JOWBMJEBUF"-- LFZT
ᛡᇰҿӶӉӐӘԕդӘԐ՛ՒӼ⏺᪨Ӄӵ ǖ JOWBMJEBUF"-- ӐӘԐ՛ՒӼ⏺᪨Ӄӵ
HFUͷछྨͱ͍͚ ǖ HFU ,LFZ -PBEJOH$BDIFӑѬLFZӕሽӃӵ7BMVFӼᒉӃӵѭ 7BMVFӘՕդԱसӕԐՑդҶ⋬⇰ӃӵӒѬ&YFDVUJPO&YDFQUJPOӼUISPXӃӵѭ ǖ HFU6ODIFDLFE ,LFZ
-PBEJOH$BDIFӑѬLFZӕሽӃӵ7BMVFӼᒉӃӵѭ HFUӒൺӂӊҶѬ$BDIF-PBEFSӑԩԏԫԗਦႌӼ⋬ӁӔҮ൶ӕਜҲӵѭ ਦ㮣$BDIF-PBEFSӑMBNCEBᐛӼਜҰᣪ ǖ HFU*G1SFTFOU 0CKFDULFZ $BDIFӑѬLFZӒӁӐᢡӕᆼཡӁӐҮӵӬӘҶҬӶӚ7BMVFӼᒉӃӵѭᾩһӶӚOVMMѭ ӇӘӥҵѬӐӘԐ՛ՒӼ.BQӒӁӐ㈘ӃBT.BQ HFU"MM1SFTFOUӔӓӬҬӵѭ
·ͱΊ (VBWB$BDIFӼਜҰӒѬᡔӑԊԿՒӕԕՋԫԟՍӘণ✵өӼ⇹ᖌӑҷӵѭ Ԑ՛Ւ㮢LFZӒWBMVFӘՂԊ㮣ҶԕՋԫԟՍҿӶѬLFZӑWBMVFӼහӝ௲Ӄѭ -PBEJOH$BDIFӑәѬLFZӕሽӃӵWBMVFӼ$BDIF-PBEFSӑ⇰ᘻӃӵѭ $BDIFӑәѬ⧞ӑLFZӕሽӃӵWBMVFӼQVUӃӵѭ FYQJSF9999 NBYJNVN9999SFGSFTI9999ӔӓӑѬ Ԑ՛ՒӘ⏺᪨ӮᥥӘᦆ㖟ӮᦴঽӼᴀӫӵҽӒҶ௲ᦸӵѭ
$BDIFӘ┣㜇Ӯ$BDIF-PBEFSӘਃӴᢅ ਦႌӘᾩ㮣ӑHFUӘᢅᴿҶႁӹӵ
αϯϓϧίʔυ IUUQTHJUIVCDPNHJTIJZBNBKBWBEP 4UBSUԗՑԡӼゼಌӁӐԾՑԎԞӑ⽇ӃӵҵѬ 0UIFS4BNQMFTԗՑԡӼಌਃҿӅӐҹӊҿҮѭ ⋬ⷭሉӘӐә➃⡣ӁӐҮӨӅӽҶѬᒁӑԝ՛ԿՓӒӁӐビӁӉҮӔӒᓤӍӐҮӨӃѭ ӨӉѬീ⢰ᡡ⃀ӘҶѬ⪙⽓ӑӃҶԛդԱਦҶӹҵӴӮӃҹ୦ᇴӁӐӨӃѭ
ࢀߟจݙ !LB[VIJSB@S+BWBӑਜҲӵԒդԿ՛ԥդԡգԕՋԫԟՍՑԌԾՑՒ IUUQEIBUFOBOFKQ,B[VIJSB !BLJSBLPZBTV㉜ೂӃӵ+BWBՑԌԾՑՒѬ(VBWB IUUQXXXBLJSBLPZBTVOFUHVBWBKBWB MJCSBSJFTFWPMWJOH !CBFMEVOH(VBWB$BDIF IUUQXXXCBFMEVOHDPNHVBWBDBDIF HPPHMF$BDIFT&YQMBJOFE IUUQTHJUIVCDPNHPPHMFHVBWBXJLJ$BDIFT&YQMBJOFE