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cachectldã§OSã®ãƒšãƒ¼ã‚¸ã‚ãƒ£ãƒƒã‚·ãƒ¥å‰Šé™¤ã‚’è‡ªå‹•åŒ– - Qiita
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maisenakajima 2015/04/18
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Java ã§ã‚ªãƒ³ãƒ¡ãƒ¢ãƒªã‚ãƒ£ãƒƒã‚·ãƒ¥ã‚’å®Ÿè£…ã™ã‚‹ã¨ãã«ã‚¹ãƒ¬ãƒƒãƒ‰ã«ã¤ã„ã¦æ°—ã‚’ã¤ã‘ã‚‹ã¹ãã“ã¨ - Qiita
ã®ã‚ˆã†ã«ï½¤Collections.synchronizedMap() ã§ã‚ˆã—ãªã«ã™ã‚‹æ–¹æ³•ãŒã‚ã‚‹ï½¡ã“ã®æ–¹æ³•ã§ãƒ©ãƒƒãƒ—ã™ã‚‹ã¨ï½¤ãƒ¡ã‚½ãƒƒãƒ‰ã‚¢ã‚¯ã‚»ã‚¹ã®éš›ã« synchronized ãŒã‹ã‹ã‚‹ã®ã§å®‰å…¨ã«ãªã‚‹ï½¡ ConcurrentHashMap ã¨ HashMap HashMap ã‚’ãƒžãƒ«ãƒã‚¹ãƒ¬ãƒƒãƒ‰ã‹ã‚‰ã‚¢ã‚¯ã‚»ã‚¹ã™ã‚‹å ´åˆï½¤get ãƒ¡ã‚½ãƒƒãƒ‰ã‚’ä½¿ã£ãŸå ´åˆã§ã‚‚ synchronized ã‚’ã‹ã‘ã–ã‚‹ã‚’ãˆãšï½¤ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ãŒå‡ºãªã„ï½¡ ConcurrentHashMap ãªã‚‰ã°ï½¤å–å¾—æ™‚ã«ã¯ãƒãƒƒã‚¯ãŒã‹ã‹ã‚‰ãªã„ã®ã§ï½¤ã‚ãƒ£ãƒƒã‚·ãƒ¥ã«ã¯ ConcurrentHashMap ã‚’ä½¿ã†ã“ã¨ãŒæœ›ã¾ã—ã„ï½¡ Java 8 ä»¥å¾Œã«ãŠã‘ã‚‹ ConcurrentHashMap ã«ã‚ˆã‚‹ã‚ãƒ£ãƒƒã‚·ãƒ¥å®Ÿè£… Java 8 ã§ã¯ ConcurrentHashMap ã« computeIfAbsent ãƒ¡ã‚½ãƒƒãƒ‰ãŒè¿½åŠ ã•ã‚Œã¦ã„ã‚‹ï½¡ã“ã‚Œã‚’åˆ©ç”¨ã™ã‚Œã°ç°¡å˜ã«ã‚ãƒ£ãƒƒã‚·ãƒ¥
maisenakajima 2014/09/21
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7. ãŸã¾ã«ã¿ã‚‹å®Ÿè£… static Map<BigInteger, List<BigInteger>> cache = new HashMap<>; void doGet(â€¦) { BigInteger n = â€¦; List<BigInteger> result = cache.get(n); if (result == null) { result = PrimeFactor.divide(n); // ç´ å› æ•°åˆ†è§£ cache.put(n, result); } // â€¦ } 8. ãŸã¾ã«ã¿ã‚‹å®Ÿè£… static Map<BigInteger, List<BigInteger>> cache = new HashMap<>; void doGet(â€¦) { BigInteger n = â€¦; List<BigInteger> result = cache.get(n); if (resu
maisenakajima 2014/09/17
ConcurrentHashMap#putIfAbsent + FutureTaskã§åŠ¹çŽ‡çš„ãªãƒªã‚¶ãƒ«ãƒˆã‚ãƒ£ãƒƒã‚·ãƒ¥ ã‚’å®Ÿè£…ã§ãã‚‹ã€‚JDK8ã‹ã‚‰ã¯ ConcurrentHashMap#computeIfAbsent()ã‚’ä½¿ç”¨ã™ã‚‹ã€‚

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maisenakajima 2014/04/27
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