Javaユーザに伝えたいGuava Cache入門

Java Do #08
https://javado.connpass.com/event/47668/

Transcript

1. !HJTIJ@ZBNB +BWBϢʔβʹ఻͍͑ͨ
   (VBWB
   $BDIF
   ೖ໳ 
2. 
3. IUUQTDPEFSEPKPTBQQPSPDPOOQBTTDPNFWFOU 
4. &BSMZ  IUUQXXXUPPDPNTVQQPSUBQQMFOFXTIUNM জᢣᦍᣀ
5. όεϩέʔγϣϯγεςϜͷ։ൃʹͯ ᣪఞⷭӒҵヹ➥ᕕ࿼ӒҵѬᥥ᡾㛯ᏌҶ৵ҮԯդԧӼ
 Ტ༪%#ҵӳ4FMFDUҿӅӵԛԡ԰ӬӍӉҮӔҮӲҰӔ᳈ҶӃӵ
   ȤѫԕՋԫԟՍӁӐөӵҵ 
6. ǖ +BWBӘԕՋԫԟՍՑԌԾՑՒ
 (PPHMFӘ+BWB᳣⇹ՑԌԾՑՒ(VBWBӘकᮿ⥎㮣
   ǖ ⼀ᇰԽԉԌՓՔԡ㮢ԛդԱञӑ⼀ᇰ㮣ӑಌਃ
   ǖ IUUQTHJUIVCDPNHPPHMFHVBWBXJLJ$BDIFT&YQMBJOFE
   ǖ NBWFO (VBWB
   $BDIF EFQFOEFODZ
   
   
   HSPVQ*EDPNHPPHMFHVBWBHSPVQ*E
   
   
   BSUJGBDU*EHVBWBBSUJGBDU*E
   
   
   WFSTJPOWFSTJPO
   EFQFOEFODZ 
7. 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 
8. 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,FZӼਜӍӉ௡ⅈӑ⇰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 
9. 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
   
   LFZӼਜҰ௡ⅈ
   
   
   4VQQMJFS
   
   
   
   LFZӼਜӹӔҮ௡ⅈ
   -BNCEBᐛӼਜҰ࿾൶Ѭ&YDFQUJPOҶԡՕդҿӶӔҮӘӑѬHFU6ODIFDLFE ,FZ ӼਜҰѭ
 㮢⼳✦әᒁ㈨ѭӉӊӁHFUӘӨӨӑӬහӝ௲Ӂ୤ӕਦႌ௡ⅈҶᒨ⺙ӔҽӒলႌәใ㛸әᾩҮ㮣 Integer v1 = randomIntCache.getUnchecked(”foo”); ← ExceptionͷνΣοΫΛ͠ͳ͍৔߹ Integer v2 = randomIntCache.getUnchecked(”foo”); 
10. ΩϟογϡͰ͖Δσʔλͷߏ଄ɿ&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՛ԡ
    ӘՂԊӼԐ՛԰ՒӒӁӐᩈ✊ӑҷӵѭ
 㮢.BQӒൺӂ㮣 Ȕ
    Ԑ՛԰Ւ 
11. ΤϯτϦͷഁغ৚݅ɿ&WJDUJPO ǖ FYQJSF"GUFS8SJUF MPOH
    EVSBUJPO
    5JNF6OJU
    VOJU 
 Ԑ՛԰ՒӼਃᘻӁӐҵӳ⏺᪨ҿӶӵӨӑӘ᥶౵ᦆ㖟ѭ
    ǖ FYQJSF"GUFS"DDFTT MPOH
    EVSBUJPO
    5JNF6OJU
    VOJU 
 Ԑ՛԰ՒӕᥰᒁӘԊԗԣԡҶҬӍӐҵӳ⏺᪨ҿӶӵӨӑӘ᥶౵ᦆ㖟ѭ
    ǖ NBYJNVN4J[F MPOH
    TJ[F 
 Ԑ՛԰ՒӼ੢ᛝӃӵᡔѭᛡᇰᡔলञӘԐ՛԰ՒᡔӕӔӵӒѬ'*'0ӑ⏺᪨ѭ
    ǖ NBYJNVN8FJHIU㮢MPOH
    TJ[F 
 Ԑ՛԰ՒӼ੢ᛝӃӵᡔѭৼҵҶᛡᇰলञӘᡔӕӔӵӒѬ'*'0ӑ⏺᪨ѭ
 ѷৼҵѸӘ☑௲ՓդՓә8FJHIFSԒԾԠԏԗ԰ӑḉӃѭ
 㮢ਦҲӚѬԕՋԫԟՍӃӵ7BMVFӘ➜൶ᡡᆻᡔѬ-JTUᡔӔӓ㮣 
12. ΤϯτϦͷഁغ৚݅ɿ3FGSFTI ǖ SFGSFTI"GUFS8SJUF MPOH
    EVSBUJPO
    5JNF6OJU
    VOJU 
 Ԑ՛԰ՒӼਃᘻӁӐҵӳ᡾Ӊӕ7BMVFӼᥥ᡾Ӂ⍃ӃӨӑӘ᥶౵ᦆ㖟ѭ
 
 FYQJSF9999
    ӒӘ㉹Ү㮴
 FYQJSFәѬᦴঽӼṅӉӃӒԐ՛԰ՒӼ⏺᪨Ӄӵ
 ⏺᪨ӘҬӒѬൺӂԕդӑHFUҿӶӵӒѬ7BMVFҶṍ૨ҿӶӵӨӑ⽠ө㈆өᑻӋӕӔӵ
 
 SFGSFTIәѬԕդӕሽӁӐ᡾ӁҮ7BMVFӼṍ૨ӃӵӨӑѬ൜Ү7BMVFӼ㈘Ӂ❰һӵ
 㮢⽠ө㈆өᑻӋӕӁӔҮ㮣 
13. ͦͷ΄͔ͷઃఆɿΨϕʔδίϨΫγϣϯͱͷ݉Ͷ߹͍ ǖ TPGU7BMVFT 
 WBMVFӼ
    4PGU3FGFSFODF
    ӕӃӵ
    ǖ XFBL,FZT 
 ,FZӼ
    8FBL3FGFSFODF
    ӕӃӵ
    ǖ XFBL7BMVFT 
 WBMVFӼ
    8FBL3FGFSFODF
    ӕӃӵ ԕդӬӁҹә7BMVFӼᐹീ῍㮢($ҿӶӮӃҹ㮣ӕӃӵѭ
    8FBLӒ4PGUӘ㉹ҮәতӘねᡭӔӓӕ⽟ᣀӼ⿤ӴӉҮҶѬ
 Ԍ՛ԡԧ՛ԡҶീ῍ҿӶӔҹӔӍӉ㗖Ә($ҿӶӮӃҿӒ⢰ҲӶӚӲҮ
    㮢8FBLӘᢅҶ($ҿӶӮӃҹѬ4PGUӘᢅҶԕՋԫԟՍൿҷ㮣 
14. αϯϓϧɿࣗ෼ͰΤϯτϦΛొ࿥͢Δ Cache<String, Integer> origCache = CacheBuilder.newBuilder() .expireAfterWrite(5, TimeUnit.SECONDS) .build(); ⧞ಌ⋵ӕ7BMVFӼՕդԱӁӔҮ$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
15. ΤϯτϦͷഁغɿJOWBMJEBUF $BDIF-PBEJOH$BDIFӘႁᡔӕᇴ⷗ӑҷӵ
    ǖ JOWBMJEBUF LFZ 
 ᛡᇰҿӶӉԕդӘԐ՛԰ՒӼ⏺᪨Ӄӵ
    ǖ JOWBMJEBUF"-- LFZT 
 ᛡᇰҿӶӉ஁ӐӘԕդӘԐ՛԰ՒӼ⏺᪨Ӄӵ
    ǖ JOWBMJEBUF"-- 
 ஁ӐӘԐ՛԰ՒӼ⏺᪨Ӄӵ 
16. HFUͷछྨͱ࢖͍෼͚ ǖ HFU ,
    LFZ 
 -PBEJOH$BDIFӑѬLFZӕሽӃӵ7BMVFӼ൐ᒉӃӵѭ
 7BMVFӘՕդԱसӕԐՑդҶ⋬⇰ӃӵӒѬ&YFDVUJPO&YDFQUJPOӼUISPXӃӵѭ
    ǖ HFU6ODIFDLFE ,
    LFZ 
 -PBEJOH$BDIFӑѬLFZӕሽӃӵ7BMVFӼ൐ᒉӃӵѭ
 HFUӒൺӂӊҶѬ$BDIF-PBEFS஗ӑԩԏԫԗਦႌӼ⋬ӁӔҮ࿾൶ӕਜҲӵѭ
 ਦ㮣$BDIF-PBEFSӑMBNCEBᐛӼਜҰᣪ
    ǖ HFU*G1SFTFOU 0CKFDU
    LFZ 
 $BDIFӑѬLFZӒӁӐᢡӕᆼཡӁӐҮӵӬӘҶҬӶӚ7BMVFӼ൐ᒉӃӵѭᾩһӶӚOVMMѭ  ӇӘӥҵѬ஁ӐӘԐ՛԰ՒӼ.BQӒӁӐ㈘Ӄ
    BT.BQ
    
    
    HFU"MM1SFTFOU
    ӔӓӬҬӵѭ
17. ·ͱΊ  (VBWB
    $BDIF
    ӼਜҰӒѬᡔ⷗ӑԊԿՒ૏ӕԕՋԫԟՍӘণ✵өӼ⇹ᖌӑҷӵѭ
    Ԑ՛԰Ւ㮢LFZӒWBMVFӘՂԊ㮣ҶԕՋԫԟՍҿӶѬLFZӑWBMVFӼහӝ௲Ӄѭ
    -PBEJOH$BDIFӑәѬLFZӕሽӃӵWBMVFӼ$BDIF-PBEFSӑ⇰ᘻӃӵѭ
    
 $BDIFӑәѬ⧞௻ӑLFZӕሽӃӵWBMVFӼQVUӃӵѭ
    FYQJSF9999
    NBYJNVN9999
    SFGSFTI9999
    ӔӓӑѬ
 Ԑ՛԰ՒӘ⏺᪨Ӯᥥ᡾Әᦆ㖟ӮᦴঽӼᴀӫӵҽӒҶ௲ᦸӵѭ
    $BDIFӘ┣㜇Ӯ$BDIF-PBEFSӘਃӴᢅ ਦႌӘ᥶ᾩ㮣ӑHFUӘᢅᴿҶႁӹӵ
18. αϯϓϧίʔυ IUUQTHJUIVCDPNHJTIJZBNBKBWBEP
    4UBSUԗՑԡӼゼಌӁӐԾՑԎԞӑ␼⽇ӃӵҵѬ
    0UIFS4BNQMFTԗՑԡӼಌਃҿӅӐҹӊҿҮѭ
    ⋬ⷭ஗ሉӘ஁Ӑә➃⡣ӁӐҮӨӅӽҶѬᒁӑԝ՛ԿՓӒӁӐビӁӉҮӔӒᓤӍӐҮӨӃѭ
    ӨӉѬീ⢰ᡡ⃀ӘҶѬ⪙⽓ӑӃҶԛդԱਦҶӹҵӴӮӃҹ୦ᇴӁӐӨӃѭ
19. ࢀߟจݙ !LB[VIJSB@S
    +BWBӑਜҲӵԒդԿ՛ԥդԡգԕՋԫԟՍՑԌԾՑՒ
 
    IUUQEIBUFOBOFKQ,B[VIJSB
    
    !BLJSBLPZBTV
    ㉜ೂӃӵ+BWBՑԌԾՑՒѬ(VBWB
 
    IUUQXXXBLJSBLPZBTVOFUHVBWBKBWB MJCSBSJFTFWPMWJOH
    
    !CBFMEVOH
    (VBWB
    $BDIF
 
    IUUQXXXCBFMEVOHDPNHVBWBDBDIF
    
    HPPHMF
    $BDIFT&YQMBJOFE
 
    IUUQTHJUIVCDPNHPPHMFHVBWBXJLJ$BDIFT&YQMBJOFE