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- å¹çã®åäžïŒ ã·ã¹ãã ã¯ãªãœãŒã¹ã广çã«å©çšããã³ã¹ããæå°éã«æããããã©ãŒãã³ã¹ãæå€§éã«é«ããŸãã
- ã³ã©ãã¬ãŒã·ã§ã³ã®æ¹åïŒ æç¢ºã«å®çŸ©ãããã¢ãŒããã¯ãã£ã¯ãéçºããŒã éã®ã³ãã¥ãã±ãŒã·ã§ã³ãšã³ã©ãã¬ãŒã·ã§ã³ãä¿é²ããŸãã
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ã·ã¹ãã ãèšèšããéã«èæ ®ãã¹ãåºæ¬çãªã·ã¹ãã èšèšååãããã€ã玹ä»ããŸãïŒ
1. é¢å¿ã®åé¢ (SoC)
æŠå¿µïŒ ã·ã¹ãã ãããããããç¹å®ã®æ©èœãåŽé¢ãæ åœããåå¥ã®ã¢ãžã¥ãŒã«ãŸãã¯ã³ã³ããŒãã³ãã«åå²ããŸãããã®ååã¯ãã¢ãžã¥ãŒã«æ§ãšä¿å®æ§ãéæããããã®åºæ¬ã§ããåã¢ãžã¥ãŒã«ã¯æç¢ºã«å®çŸ©ãããç®çãæã¡ãä»ã®ã¢ãžã¥ãŒã«ãžã®äŸåãæå°éã«æããã¹ãã§ããããã«ããããã¹ãã®å®¹ææ§ãåå©çšæ§ãããã³ã·ã¹ãã å šäœã®æç¢ºããåäžããŸãã
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- ã¢ãžã¥ãŒã«æ§ã®åäžïŒ åã¢ãžã¥ãŒã«ã¯ç¬ç«ããŠãããèªå·±å®çµããŠããŸãã
- ä¿å®æ§ã®åŒ·åïŒ ããã¢ãžã¥ãŒã«ãžã®å€æŽãä»ã®ã¢ãžã¥ãŒã«ã«äžãã圱é¿ãæå°éã«ãªããŸãã
- åå©çšæ§ã®åäžïŒ ã¢ãžã¥ãŒã«ã¯ã·ã¹ãã ã®ç°ãªãéšåãä»ã®ã·ã¹ãã ã§åå©çšã§ããŸãã
- ãã¹ãã®ç°¡çŽ åïŒ ã¢ãžã¥ãŒã«ã¯ç¬ç«ããŠãã¹ãã§ããŸãã
äŸïŒ Eã³ããŒã¹ã¢ããªã±ãŒã·ã§ã³ã§ã¯ããŠãŒã¶ãŒèªèšŒãååã«ã¿ãã°ç®¡çãæ³šæåŠçãããã³æ±ºæžã²ãŒããŠã§ã€çµ±åã®ããã®åå¥ã®ã¢ãžã¥ãŒã«ãäœæããããšã§é¢å¿ãåé¢ããŸãããŠãŒã¶ãŒèªèšŒã¢ãžã¥ãŒã«ã¯ãŠãŒã¶ãŒã®ãã°ã€ã³ãšèªå¯ãåŠçããååã«ã¿ãã°ã¢ãžã¥ãŒã«ã¯ååæ å ±ã管çããæ³šæåŠçã¢ãžã¥ãŒã«ã¯æ³šæã®äœæãšå±¥è¡ãåŠçããæ±ºæžã²ãŒããŠã§ã€çµ±åã¢ãžã¥ãŒã«ã¯æ¯æãåŠçãåŠçããŸãã
2. åäžè²¬ä»»ã®åå (SRP)
æŠå¿µïŒ ã¢ãžã¥ãŒã«ãã¯ã©ã¹ã倿Žãããçç±ã¯1ã€ã ãã§ããã¹ãã§ãããã®ååã¯SoCãšå¯æ¥ã«é¢é£ããŠãããåã¢ãžã¥ãŒã«ãã¯ã©ã¹ãåäžã®æç¢ºã«å®çŸ©ãããç®çãæã€ããšãä¿èšŒããããšã«çŠç¹ãåœãŠãŠããŸããã¢ãžã¥ãŒã«ãè€æ°ã®è²¬ä»»ãæã€ãšãä¿å®ãé£ãããªããã·ã¹ãã ã®ä»ã®éšåã®å€æŽã®åœ±é¿ãåãããããªããŸãã責任ãæå°ã®æ©èœåäœã«åããããã«ã¢ãžã¥ãŒã«ãæŽç·ŽãããããšãéèŠã§ãã
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- åé床ã®åäžïŒ ã¢ãžã¥ãŒã«ã¯åäžã®ç®çã«éäžããŸãã
- ãã¹ãå®¹ææ§ã®åäžïŒ ã¢ãžã¥ãŒã«ã®ãã¹ãã容æã«ãªããŸãã
äŸïŒ ã¬ããŒãã·ã¹ãã ã«ãããŠã1ã€ã®ã¯ã©ã¹ãã¬ããŒãã®çæãšã¡ãŒã«ã§ã®éä¿¡ã®äž¡æ¹ãæ åœãã¹ãã§ã¯ãããŸããã代ããã«ãã¬ããŒãçæçšãšã¡ãŒã«éä¿¡çšã«å¥ã ã®ã¯ã©ã¹ãäœæããŸããããã«ãããã¡ãŒã«éä¿¡æ©èœã«åœ±é¿ãäžããããšãªãã¬ããŒãçæããžãã¯ã倿Žã§ãããã®éãåæ§ã§ããããã¯ãã¬ããŒãã¢ãžã¥ãŒã«å šäœã®ä¿å®æ§ãšä¿ææ§ããµããŒãããŸãã
3. Don't Repeat Yourself (DRY) / ç¹°ãè¿ããé¿ãã
æŠå¿µïŒ ã³ãŒããããžãã¯ã®éè€ãé¿ããŸãã代ããã«ãå ±éã®æ©èœãåå©çšå¯èœãªã³ã³ããŒãã³ãã颿°ã«ã«ãã»ã«åããŸããéè€ã¯ã倿Žãè€æ°ç®æã§è¡ãå¿ èŠããããããä¿å®ã³ã¹ãã®å¢å ã«ã€ãªãããŸããDRYã¯ãã³ãŒãã®åå©çšæ§ãäžè²«æ§ãããã³ä¿å®æ§ãä¿é²ããŸããå ±éã®ã«ãŒãã³ãã³ã³ããŒãã³ããžã®æŽæ°ã倿Žã¯ãã¢ããªã±ãŒã·ã§ã³å šäœã«èªåçã«é©çšãããŸãã
å©ç¹ïŒ
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- äžè²«æ§ã®åäžïŒ 倿Žãã·ã¹ãã å šäœã§äžè²«ããŠé©çšãããŸãã
- ä¿å®ã³ã¹ãã®åæžïŒ ã·ã¹ãã ã®ä¿å®ãšæŽæ°ã容æã«ãªããŸãã
äŸïŒ è€æ°ã®ã¢ãžã¥ãŒã«ãããŒã¿ããŒã¹ã«ã¢ã¯ã»ã¹ããå¿ èŠãããå ŽåãããŒã¿ããŒã¹æ¥ç¶ããžãã¯ãã«ãã»ã«åããå ±éã®ããŒã¿ããŒã¹ã¢ã¯ã»ã¹ã¬ã€ã€ãŒãŸãã¯ãŠãŒãã£ãªãã£ã¯ã©ã¹ãäœæããŸããããã«ãããåã¢ãžã¥ãŒã«ã§ããŒã¿ããŒã¹æ¥ç¶ã³ãŒããéè€ãããããšãé¿ãããã¹ãŠã®ã¢ãžã¥ãŒã«ãåãæ¥ç¶ãã©ã¡ãŒã¿ãšãšã©ãŒåŠçã¡ã«ããºã ã䜿çšããããšãä¿èšŒããŸããå¥ã®ã¢ãããŒããšããŠãEntity FrameworkãHibernateã®ãããªORM (Object-Relational Mapper) ã䜿çšããæ¹æ³ããããŸãã
4. Keep It Simple, Stupid (KISS) / ã·ã³ãã«ã«ä¿ã€
æŠå¿µïŒ ã·ã¹ãã ãã§ããã ãã·ã³ãã«ã«èšèšããŸããäžå¿ èŠãªè€éããé¿ããåçŽããšæç¢ºãã远æ±ããŸããè€éãªã·ã¹ãã ã¯ãçè§£ãä¿å®ããããã°ãå°é£ã§ããKISSã¯ãéå°ãªèšèšãäžå¿ èŠãªæœè±¡åãå°å ¥ããã®ã§ã¯ãªããèŠä»¶ãæºããæãåçŽãªè§£æ±ºçãéžæããããšã奚å±ããŸããã³ãŒãã®äžè¡äžè¡ããã°ã®çºçæ©äŒã§ãããããã£ãŠãã·ã³ãã«ã§çŽæ¥çãªã³ãŒãã¯ãè€éã§çè§£ãã«ããã³ãŒããããã¯ããã«åªããŠããŸãã
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- ä¿¡é Œæ§ã®åäžïŒ ããã·ã³ãã«ãªã·ã¹ãã ã¯ãšã©ãŒãçºçãã«ããã§ãã
- éçºã®é«éåïŒ ããã·ã³ãã«ãªã·ã¹ãã ã¯éçºãéããªããŸãã
äŸïŒ APIãèšèšããéãJSONãèŠä»¶ãæºããã®ã§ããã°ãXMLã®ãããªããè€éãªãã©ãŒããããããJSONã®ãããªã·ã³ãã«ã§çŽæ¥çãªããŒã¿ãã©ãŒããããéžæããŸããåæ§ã«ãããã·ã³ãã«ãªã¢ãããŒãã§ååãªå Žåã¯ãé床ã«è€éãªãã¶ã€ã³ãã¿ãŒã³ãã¢ãŒããã¯ãã£ã¹ã¿ã€ã«ã䜿çšããªãã§ãã ãããæ¬çªç°å¢ã®åé¡ããããã°ããéã¯ããããããè€éãªåé¡ã§ãããšä»®å®ããåã«ããŸãçŽæ¥çãªã³ãŒããã¹ã確èªããŠãã ããã
5. You Ain't Gonna Need It (YAGNI) / å¿ èŠã«ãªããŸã§äœããª
æŠå¿µïŒ å®éã«å¿ èŠã«ãªããŸã§æ©èœã远å ããŸãããæ©ãããæé©åãé¿ããå°æ¥çã«ã¯åœ¹ç«ã€ãããããªãã仿¥å¿ èŠãšãããŠããªãæ©èœã远å ããèªæã«æµæããŸããYAGNIã¯ã䟡å€ã段éçã«æäŸããäžå¿ èŠãªè€éããé¿ããããšã«çŠç¹ãåœãŠãããªãŒã³ã§ã¢ãžã£ã€ã«ãªéçºã¢ãããŒããä¿é²ããŸããããã«ãããæ¶ç©ºã®å°æ¥ã®åé¡ã§ã¯ãªããå®éã®åé¡ã«å¯ŸåŠããããšã匷å¶ãããŸããæªæ¥ãããçŸåšãäºæž¬ããæ¹ããã°ãã°å®¹æã§ãã
å©ç¹ïŒ
- è€éãã®è»œæžïŒ ã·ã¹ãã ã¯ããã·ã³ãã«ã§ä¿å®ã容æã«ãªããŸãã
- éçºã®é«éåïŒ è¿ éã«äŸ¡å€ãæäŸããããšã«éäžã§ããŸãã
- ãªã¹ã¯ã®è»œæžïŒ 決ããŠäœ¿ãããªããããããªãæ©èœã«æéãæµªè²»ããããšãé¿ããŸãã
äŸïŒ ãã®æ±ºæžã²ãŒããŠã§ã€ã䜿ããããšããå®éã®é¡§å®¢ãçŸãããŸã§ãEã³ããŒã¹ã¢ããªã±ãŒã·ã§ã³ã«æ°ããæ±ºæžã²ãŒããŠã§ã€ã®ãµããŒãã远å ããªãã§ãã ãããåæ§ã«ããã®èšèªã話ããŠãŒã¶ãŒãçžåœæ°ã«ãªããŸã§ããŠã§ããµã€ãã«æ°ããèšèªã®ãµããŒãã远å ããªãã§ãã ãããå®éã®ãŠãŒã¶ãŒã®ããŒãºãšããžãã¹èŠä»¶ã«åºã¥ããŠæ©èœã®åªå é äœãä»ããŸãã
6. ãã¡ãã«ã®æ³å (LoD)
æŠå¿µïŒ ã¢ãžã¥ãŒã«ã¯ããã®çŽæ¥ã®ååè ãšã®ã¿å¯Ÿè©±ãã¹ãã§ããã¡ãœããåŒã³åºãã®é£éãä»ããŠãªããžã§ã¯ãã«ã¢ã¯ã»ã¹ããããšãé¿ããŸããLoDã¯ççµåãä¿é²ããã¢ãžã¥ãŒã«éã®äŸåé¢ä¿ãæžãããŸããå éšç¶æ ã«æãåºãã®ã§ã¯ãªããçŽæ¥ã®ååè ã«è²¬ä»»ãå§ä»»ããããšã奚å±ããŸããããã¯ãã¢ãžã¥ãŒã«ã以äžã®ã¡ãœããã®ã¿ãåŒã³åºãã¹ãã§ããããšãæå³ããŸãïŒ
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- ãã®ãã©ã¡ãŒã¿ãªããžã§ã¯ã
- ãããäœæããä»»æã®ãªããžã§ã¯ã
- ãã®çŽæ¥ã®ã³ã³ããŒãã³ããªããžã§ã¯ã
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- çµå床ã®äœæžïŒ ã¢ãžã¥ãŒã«å士ã®äŸå床ãäœããªããŸãã
- ä¿å®æ§ã®åäžïŒ ããã¢ãžã¥ãŒã«ãžã®å€æŽãä»ã®ã¢ãžã¥ãŒã«ã«äžãã圱é¿ãæå°éã«ãªããŸãã
- åå©çšæ§ã®åäžïŒ ã¢ãžã¥ãŒã«ã¯ç°ãªãã³ã³ããã¹ãã§ãã容æã«åå©çšã§ããŸãã
äŸïŒ `Customer` ãªããžã§ã¯ãã `Order` ãªããžã§ã¯ãã®äœæã«çŽæ¥ã¢ã¯ã»ã¹ããã®ã§ã¯ãªãããã®è²¬ä»»ã `Order` ãªããžã§ã¯ãèªäœã«å§ä»»ããŸãã`Customer` ãªããžã§ã¯ã㯠`Order` ãªããžã§ã¯ãã®å ¬éã€ã³ã¿ãŒãã§ãŒã¹ãšã®ã¿å¯Ÿè©±ãã¹ãã§ããããã®å éšç¶æ ãšã¯å¯Ÿè©±ãã¹ãã§ã¯ãããŸãããããã¯ãå°ãããªãåœããïŒtell, don't askïŒããšåŒã°ããããšããããŸãã
7. ãªã¹ã³ãã®çœ®æåå (LSP)
æŠå¿µïŒ ãµãã¿ã€ãã¯ãããã°ã©ã ã®æ£åœæ§ãå€ããããšãªãããã®ããŒã¹ã¿ã€ãã«çœ®æå¯èœã§ãªããã°ãªããŸããããã®ååã¯ãç¶æ¿ãæ£ãã䜿çšããããµãã¿ã€ããäºæž¬å¯èœãªæ¹æ³ã§åäœããããšãä¿èšŒããŸãããµãã¿ã€ããLSPã«éåãããšãäºæããªãåäœããšã©ãŒã«ã€ãªããå¯èœæ§ããããŸããLSPã¯ãã³ãŒãã®åå©çšæ§ãæ¡åŒµæ§ãä¿å®æ§ãä¿é²ããããã®éèŠãªååã§ããããã«ãããéçºè ã¯äºæããªãå¯äœçšãå°å ¥ããããšãªããèªä¿¡ãæã£ãŠã·ã¹ãã ãæ¡åŒµããã³å€æŽã§ããŸãã
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- æ¡åŒµæ§ã®åŒ·åïŒ æ¢åã®ã³ãŒãã«åœ±é¿ãäžããããšãªããæ°ãããµãã¿ã€ãã远å ã§ããŸãã
- ãªã¹ã¯ã®è»œæžïŒ ãµãã¿ã€ããäºæž¬å¯èœãªæ¹æ³ã§åäœããããšãä¿èšŒãããŸãã
äŸïŒ å¹ ãšé«ããèšå®ããã¡ãœãããæã€ `Rectangle` ãšããåºåºã¯ã©ã¹ãããå Žåã`Square` ãšãããµãã¿ã€ãã¯ã`Rectangle` ã®å¥çŽã«éåããæ¹æ³ã§ãããã®ã¡ãœããããªãŒããŒã©ã€ããã¹ãã§ã¯ãããŸãããããšãã°ã`Square` ã®å¹ ãèšå®ãããšãé«ããåãå€ã«èšå®ããããããæ£æ¹åœ¢ã§ããç¶ããããšãä¿èšŒããå¿ èŠããããŸããããã§ãªãå ŽåãLSPã«éåããŸãã
8. ã€ã³ã¿ãŒãã§ãŒã¹åé¢ã®åå (ISP)
æŠå¿µïŒ ã¯ã©ã€ã¢ã³ãã¯ã䜿çšããªãã¡ãœããã«äŸåããããšã匷å¶ãããã¹ãã§ã¯ãããŸããããã®ååã¯ãå€§èŠæš¡ã§äžæå²©ã®ã€ã³ã¿ãŒãã§ãŒã¹ã§ã¯ãªããããå°ãããããçŠç¹ãçµã£ãã€ã³ã¿ãŒãã§ãŒã¹ãäœæããããšã奚å±ããŸããããã«ããããœãããŠã§ã¢ã·ã¹ãã ã®æè»æ§ãšåå©çšæ§ãåäžããŸããISPã«ãããã¯ã©ã€ã¢ã³ãã¯èªåã«é¢é£ããã¡ãœããã«ã®ã¿äŸåã§ããã€ã³ã¿ãŒãã§ãŒã¹ã®ä»ã®éšåãžã®å€æŽã®åœ±é¿ãæå°éã«æããããšãã§ããŸãããŸããççµåãä¿é²ããã·ã¹ãã ã®ä¿å®ãšé²åã容æã«ããŸãã
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