{"id":1910,"date":"2026-03-23T19:13:59","date_gmt":"2026-03-23T19:13:59","guid":{"rendered":"https:\/\/www.tech-posts.com\/vi\/encapsulation-principles-object-oriented-design\/"},"modified":"2026-03-23T19:13:59","modified_gmt":"2026-03-23T19:13:59","slug":"encapsulation-principles-object-oriented-design","status":"publish","type":"post","link":"https:\/\/www.tech-posts.com\/vi\/encapsulation-principles-object-oriented-design\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn OOAD: C\u00e1c Nguy\u00ean t\u1eafc Bao \u0111\u00f3ng trong Thi\u1ebft k\u1ebf H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng"},"content":{"rendered":"
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<\/figure>\n<\/div>\n

Bao \u0111\u00f3ng \u0111\u1ee9ng v\u1eefng nh\u01b0 m\u1ed9t trong nh\u1eefng tr\u1ee5 c\u1ed9t n\u1ec1n t\u1ea3ng c\u1ee7a thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. \u0110\u00f3 l\u00e0 c\u01a1 ch\u1ebf cho ph\u00e9p c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ea7n m\u1ec1m qu\u1ea3n l\u00fd \u0111\u1ed9 ph\u1ee9c t\u1ea1p b\u1eb1ng c\u00e1ch gom d\u1eef li\u1ec7u v\u00e0 c\u00e1c ph\u01b0\u01a1ng th\u1ee9c thao t\u00e1c tr\u00ean d\u1eef li\u1ec7u \u0111\u00f3 v\u00e0o m\u1ed9t \u0111\u01a1n v\u1ecb duy nh\u1ea5t. Nguy\u00ean t\u1eafc n\u00e0y kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 che gi\u1ea5u th\u00f4ng tin; m\u00e0 c\u00f2n l\u00e0 vi\u1ec7c x\u00e1c \u0111\u1ecbnh r\u00f5 ranh gi\u1edbi cho c\u00e1ch c\u00e1c th\u00e0nh ph\u1ea7n t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau. B\u1eb1ng c\u00e1ch ki\u1ec3m so\u00e1t quy\u1ec1n truy c\u1eadp v\u00e0o tr\u1ea1ng th\u00e1i n\u1ed9i b\u1ed9, c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c duy tr\u00ec xuy\u00ean su\u1ed1t v\u00f2ng \u0111\u1eddi c\u1ee7a \u1ee9ng d\u1ee5ng.<\/p>\n

Trong ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m hi\u1ec7n \u0111\u1ea1i, m\u1ee5c ti\u00eau l\u00e0 t\u1ea1o ra c\u00e1c h\u1ec7 th\u1ed1ng b\u1ec1n v\u1eefng, d\u1ec5 b\u1ea3o tr\u00ec v\u00e0 m\u1edf r\u1ed9ng \u0111\u01b0\u1ee3c. Bao \u0111\u00f3ng g\u00f3p ph\u1ea7n tr\u1ef1c ti\u1ebfp v\u00e0o nh\u1eefng m\u1ee5c ti\u00eau n\u00e0y. N\u00f3 l\u00e0m gi\u1ea3m di\u1ec7n t\u00edch t\u00e1c \u0111\u1ed9ng m\u00e0 m\u00e3 b\u00ean ngo\u00e0i c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn, t\u1eeb \u0111\u00f3 h\u1ea1n ch\u1ebf kh\u1ea3 n\u0103ng x\u1ea3y ra c\u00e1c hi\u1ec7u \u1ee9ng ph\u1ee5 kh\u00f4ng mong mu\u1ed1n. Khi m\u1ed9t module \u0111\u01b0\u1ee3c bao \u0111\u00f3ng t\u1ed1t, vi\u1ec7c thay \u0111\u1ed5i tri\u1ec3n khai n\u1ed9i b\u1ed9 c\u1ee7a n\u00f3 kh\u00f4ng nh\u1ea5t thi\u1ebft \u0111\u00f2i h\u1ecfi thay \u0111\u1ed5i m\u00e3 s\u1eed d\u1ee5ng n\u00f3. S\u1ef1 t\u00e1ch bi\u1ec7t tr\u00e1ch nhi\u1ec7m n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u00e1c \u0111\u1ed9i ph\u00e1t tri\u1ec3n quy m\u00f4 l\u1edbn l\u00e0m vi\u1ec7c tr\u00ean c\u00e1c d\u1ef1 \u00e1n ph\u1ee9c t\u1ea1p.<\/p>\n

\ud83d\udce6 Hi\u1ec3u r\u00f5 Kh\u00e1i ni\u1ec7m C\u1ed1t l\u00f5i<\/h2>\n

\u1ede c\u1ed1t l\u00f5i, bao \u0111\u00f3ng l\u00e0 v\u1ec1 vi\u1ec7c gom nh\u00f3m l\u1ea1i. N\u00f3 k\u1ebft h\u1ee3p tr\u1ea1ng th\u00e1i (thu\u1ed9c t\u00ednh) v\u00e0 h\u00e0nh vi (ph\u01b0\u01a1ng th\u1ee9c) c\u1ee7a m\u1ed9t kh\u00e1i ni\u1ec7m th\u00e0nh m\u1ed9t \u0111\u01a1n v\u1ecb th\u1ed1ng nh\u1ea5t. H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng m\u1ed9t chi\u1ebfc h\u1ed9p v\u1eadt l\u00fd. B\u00ean trong h\u1ed9p, b\u1ea1n c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u v\u1eadt d\u1ee5ng, c\u00f4ng c\u1ee5 ho\u1eb7c t\u00e0i li\u1ec7u nh\u1ea1y c\u1ea3m. H\u1ed9p c\u00f3 n\u1eafp \u0111\u1eady \u0111\u1ec3 gi\u1eef c\u00e1c v\u1eadt n\u00e0y an to\u00e0n v\u00e0 \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp g\u1ecdn g\u00e0ng. Ng\u01b0\u1eddi d\u00f9ng b\u00ean ngo\u00e0i c\u00f3 th\u1ec3 t\u01b0\u01a1ng t\u00e1c v\u1edbi h\u1ed9p, nh\u01b0ng h\u1ecd kh\u00f4ng th\u1ec3 nh\u00ecn th\u1ea5y hay ch\u1ea1m tr\u1ef1c ti\u1ebfp v\u00e0o c\u00e1c v\u1eadt b\u00ean trong tr\u1eeb khi \u0111i qua c\u00e1c k\u00eanh h\u1ee3p l\u1ec7.<\/p>\n

Trong b\u1ed1i c\u1ea3nh l\u1eadp tr\u00ecnh, m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u00f3ng vai tr\u00f2 nh\u01b0 chi\u1ebfc h\u1ed9p \u0111\u00f3. N\u00f3 ch\u1ee9a c\u00e1c tr\u01b0\u1eddng d\u1eef li\u1ec7u v\u00e0 c\u00f4ng khai c\u00e1c ph\u01b0\u01a1ng th\u1ee9c cho ph\u00e9p c\u00e1c ph\u1ea7n kh\u00e1c trong h\u1ec7 th\u1ed1ng y\u00eau c\u1ea7u th\u00f4ng tin ho\u1eb7c th\u1ef1c hi\u1ec7n h\u00e0nh \u0111\u1ed9ng. Tuy nhi\u00ean, c\u00e1c tr\u01b0\u1eddng d\u1eef li\u1ec7u n\u1ed9i b\u1ed9 kh\u00f4ng th\u1ec3 truy c\u1eadp tr\u1ef1c ti\u1ebfp. S\u1ef1 h\u1ea1n ch\u1ebf n\u00e0y ng\u0103n c\u1ea3n m\u00e3 b\u00ean ngo\u00e0i \u0111\u1eb7t \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0o tr\u1ea1ng th\u00e1i kh\u00f4ng h\u1ee3p l\u1ec7.<\/p>\n

T\u1ea1i sao \u0111i\u1ec1u n\u00e0y l\u1ea1i quan tr\u1ecdng? \ud83e\udd14<\/h3>\n

Kh\u00f4ng c\u00f3 bao \u0111\u00f3ng, d\u1eef li\u1ec7u s\u1ebd b\u1ecb ph\u01a1i b\u00e0y t\u1ef1 do. B\u1ea5t k\u1ef3 ph\u1ea7n n\u00e0o trong ch\u01b0\u01a1ng tr\u00ecnh c\u0169ng c\u00f3 th\u1ec3 thay \u0111\u1ed5i n\u00f3 b\u1ea5t c\u1ee9 l\u00fac n\u00e0o. \u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn th\u1ee9 th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 “m\u00e3 spaghetti”, n\u01a1i c\u00e1c ph\u1ee5 thu\u1ed9c r\u1ed1i r\u1eafm v\u00e0 kh\u00f3 theo d\u00f5i. N\u1ebfu m\u1ed9t bi\u1ebfn thay \u0111\u1ed5i m\u1ed9t c\u00e1ch b\u1ea5t ng\u1edd, vi\u1ec7c t\u00ecm ra ngu\u1ed3n g\u1ed1c l\u1ed7i tr\u1edf th\u00e0nh \u00e1c m\u1ed9ng. Bao \u0111\u00f3ng mang l\u1ea1i s\u1ef1 k\u1ef7 lu\u1eadt.<\/p>\n

    \n
  • Ki\u1ec3m so\u00e1t:<\/strong> B\u1ea1n ki\u1ec3m so\u00e1t khi n\u00e0o v\u00e0 c\u00e1ch n\u00e0o d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c thay \u0111\u1ed5i.<\/li>\n
  • B\u1ea3o m\u1eadt:<\/strong> Th\u00f4ng tin nh\u1ea1y c\u1ea3m v\u1eabn \u0111\u01b0\u1ee3c gi\u1eef k\u00edn kh\u1ecfi truy c\u1eadp kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e9p.<\/li>\n
  • B\u1ea3o tr\u00ec:<\/strong> B\u1ea1n c\u00f3 th\u1ec3 thay \u0111\u1ed5i logic n\u1ed9i b\u1ed9 m\u00e0 kh\u00f4ng l\u00e0m h\u1ecfng ph\u1ea7n c\u00f2n l\u1ea1i c\u1ee7a h\u1ec7 th\u1ed1ng.<\/li>\n
  • G\u1ee1 l\u1ed7i:<\/strong> L\u1ed7i tr\u1edf n\u00ean d\u1ec5 c\u00f4 l\u1eadp h\u01a1n v\u00ec giao di\u1ec7n \u1ed5n \u0111\u1ecbnh.<\/li>\n<\/ul>\n

    \ud83d\udd12 C\u01a1 ch\u1ebf Ki\u1ec3m so\u00e1t Truy c\u1eadp<\/h2>\n

    \u0110\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c bao \u0111\u00f3ng, c\u00e1c ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh cung c\u1ea5p c\u00e1c t\u1eeb kh\u00f3a ki\u1ec3m so\u00e1t truy c\u1eadp. Nh\u1eefng t\u1eeb kh\u00f3a n\u00e0y x\u00e1c \u0111\u1ecbnh m\u1ee9c \u0111\u1ed9 hi\u1ec3n th\u1ecb c\u1ee7a c\u00e1c l\u1edbp, ph\u01b0\u01a1ng th\u1ee9c v\u00e0 tr\u01b0\u1eddng. M\u1eb7c d\u00f9 c\u00fa ph\u00e1p c\u1ee5 th\u1ec3 c\u00f3 th\u1ec3 kh\u00e1c nhau, nh\u01b0ng logic n\u1ec1n t\u1ea3ng v\u1eabn nh\u1ea5t qu\u00e1n trong ph\u1ea7n l\u1edbn c\u00e1c m\u00f4 h\u00ecnh h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng.<\/p>\n

    Ba M\u1ee9c \u0111\u1ed9 Hi\u1ec3n th\u1ecb<\/h3>\n\n\n\n\n\n
    Ch\u1ec9nh s\u1eeda<\/th>\nPh\u1ea1m vi Hi\u1ec3n th\u1ecb<\/th>\nTr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng<\/th>\n<\/tr>\n
    Ri\u00eang t\u01b0<\/strong><\/td>\nCh\u1ec9 c\u00f3 th\u1ec3 truy c\u1eadp trong c\u00f9ng m\u1ed9t l\u1edbp<\/td>\nTr\u1ea1ng th\u00e1i n\u1ed9i b\u1ed9 m\u00e0 kh\u00f4ng bao gi\u1edd \u0111\u01b0\u1ee3c thay \u0111\u1ed5i tr\u1ef1c ti\u1ebfp<\/td>\n<\/tr>\n
    B\u1ea3o v\u1ec7<\/strong><\/td>\nC\u00f3 th\u1ec3 truy c\u1eadp trong l\u1edbp v\u00e0 c\u00e1c l\u1edbp con c\u1ee7a n\u00f3<\/td>\nTr\u1ea1ng th\u00e1i c\u1ea7n \u0111\u01b0\u1ee3c k\u1ebf th\u1eeba nh\u01b0ng kh\u00f4ng \u0111\u01b0\u1ee3c c\u00f4ng khai<\/td>\n<\/tr>\n
    C\u00f4ng khai<\/strong><\/td>\nC\u00f3 th\u1ec3 truy c\u1eadp t\u1eeb b\u1ea5t k\u1ef3 \u0111\u00e2u<\/td>\nGiao di\u1ec7n d\u1ef1 ki\u1ebfn cho t\u01b0\u01a1ng t\u00e1c b\u00ean ngo\u00e0i<\/td>\n<\/tr>\n<\/table>\n

    S\u1eed d\u1ee5ng private<\/strong>S\u1eed d\u1ee5ng hi\u1ec7u qu\u1ea3 s\u1ebd l\u00e0 chi\u1ebfn l\u01b0\u1ee3c ph\u1ed5 bi\u1ebfn nh\u1ea5t cho vi\u1ec7c \u0111\u00f3ng g\u00f3i m\u1ea1nh m\u1ebd. Khi m\u1ed9t tr\u01b0\u1eddng l\u00e0 private, kh\u00f4ng l\u1edbp n\u00e0o kh\u00e1c c\u00f3 th\u1ec3 \u0111\u1ecdc ho\u1eb7c ghi n\u00f3 tr\u1ef1c ti\u1ebfp. Thay v\u00e0o \u0111\u00f3, ch\u00fang ph\u1ea3i g\u1ecdi m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c c\u00f4ng khai. Ph\u01b0\u01a1ng th\u1ee9c n\u00e0y, th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 getter ho\u1eb7c setter, ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t ng\u01b0\u1eddi ki\u1ec3m so\u00e1t ra v\u00e0o.<\/p>\n

    \ud83d\udee1\ufe0f T\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u v\u00e0 c\u00e1c b\u1ea5t bi\u1ebfn<\/h2>\n

    M\u1ed9t trong nh\u1eefng tr\u00e1ch nhi\u1ec7m ch\u00ednh c\u1ee7a \u0111\u00f3ng g\u00f3i l\u00e0 duy tr\u00ec c\u00e1c b\u1ea5t bi\u1ebfn d\u1eef li\u1ec7u. M\u1ed9t b\u1ea5t bi\u1ebfn l\u00e0 m\u1ed9t \u0111i\u1ec1u ki\u1ec7n ph\u1ea3i lu\u00f4n \u0111\u00fang \u0111\u1ec3 \u0111\u1ed1i t\u01b0\u1ee3ng ho\u1ea1t \u0111\u1ed9ng \u0111\u00fang c\u00e1ch. V\u00ed d\u1ee5, m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng t\u00e0i kho\u1ea3n ng\u00e2n h\u00e0ng kh\u00f4ng bao gi\u1edd \u0111\u01b0\u1ee3c c\u00f3 s\u1ed1 d\u01b0 \u00e2m n\u1ebfu quy t\u1eafc kinh doanh quy \u0111\u1ecbnh nh\u01b0 v\u1eady.<\/p>\n

    X\u00e1c th\u1ef1c \u0111\u1ea7u v\u00e0o<\/h3>\n

    B\u1eb1ng c\u00e1ch bu\u1ed9c m\u1ecdi thay \u0111\u1ed5i ph\u1ea3i \u0111i qua m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c c\u00f4ng khai, b\u1ea1n c\u00f3 th\u1ec3 x\u00e1c th\u1ef1c d\u1eef li\u1ec7u tr\u01b0\u1edbc khi l\u01b0u tr\u1eef. \u0110\u00e2y l\u00e0 n\u01a1i logic \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n. N\u1ebfu b\u1ea1n c\u1ed1 g\u1eafng \u0111\u1eb7t s\u1ed1 d\u01b0 th\u00e0nh m\u1ed9t con s\u1ed1 \u00e2m, ph\u01b0\u01a1ng th\u1ee9c c\u00f3 th\u1ec3 t\u1eeb ch\u1ed1i y\u00eau c\u1ea7u ho\u1eb7c n\u00e9m ra l\u1ed7i.<\/p>\n

      \n
    • X\u00e1c th\u1ef1c:<\/strong> Ki\u1ec3m tra xem gi\u00e1 tr\u1ecb c\u00f3 \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u hay kh\u00f4ng.<\/li>\n
    • Chu\u1ea9n h\u00f3a:<\/strong> Chuy\u1ec3n \u0111\u1ed5i d\u1eef li\u1ec7u th\u00e0nh \u0111\u1ecbnh d\u1ea1ng chu\u1ea9n tr\u01b0\u1edbc khi l\u01b0u tr\u1eef.<\/li>\n
    • Ghi nh\u1eadt k\u00fd:<\/strong> Ghi l\u1ea1i khi c\u00e1c thay \u0111\u1ed5i nh\u1ea1y c\u1ea3m x\u1ea3y ra \u0111\u1ec3 ph\u1ee5c v\u1ee5 ki\u1ec3m to\u00e1n.<\/li>\n<\/ul>\n

      H\u00e3y xem x\u00e9t m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng h\u1ed3 s\u01a1 ng\u01b0\u1eddi d\u00f9ng. N\u1ebfu h\u1ec7 th\u1ed1ng y\u00eau c\u1ea7u \u0111\u1ecba ch\u1ec9 email ph\u1ea3i h\u1ee3p l\u1ec7, ph\u01b0\u01a1ng th\u1ee9c setter n\u00ean ki\u1ec3m tra \u0111\u1ecbnh d\u1ea1ng. N\u1ebfu \u0111\u1ecbnh d\u1ea1ng sai, ph\u01b0\u01a1ng th\u1ee9c s\u1ebd t\u1eeb ch\u1ed1i c\u1eadp nh\u1eadt. \u0110i\u1ec1u n\u00e0y gi\u00fap c\u01a1 s\u1edf d\u1eef li\u1ec7u lu\u00f4n s\u1ea1ch s\u1ebd v\u00e0 ng\u0103n ng\u1eeba l\u1ed7i \u1edf c\u00e1c b\u01b0\u1edbc ti\u1ebfp theo khi \u0111\u1ecba ch\u1ec9 email \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 g\u1eedi th\u00f4ng b\u00e1o.<\/p>\n

      \ud83d\udd17 T\u00ednh li\u00ean k\u1ebft v\u00e0 t\u00ednh g\u1eafn k\u1ebft<\/h2>\n

      Vi\u1ec7c \u0111\u00f3ng g\u00f3i tr\u1ef1c ti\u1ebfp \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hai ch\u1ec9 s\u1ed1 quan tr\u1ecdng trong thi\u1ebft k\u1ebf ph\u1ea7n m\u1ec1m: t\u00ednh li\u00ean k\u1ebft v\u00e0 t\u00ednh g\u1eafn k\u1ebft.<\/p>\n

      Li\u00ean k\u1ebft th\u1ea5p<\/h3>\n

      Li\u00ean k\u1ebft \u0111\u1ec1 c\u1eadp \u0111\u1ebfn m\u1ee9c \u0111\u1ed9 ph\u1ee5 thu\u1ed9c l\u1eabn nhau gi\u1eefa c\u00e1c m\u00f4-\u0111un ph\u1ea7n m\u1ec1m. Li\u00ean k\u1ebft cao c\u00f3 ngh\u0129a l\u00e0 c\u00e1c m\u00f4-\u0111un ph\u1ee5 thu\u1ed9c m\u1ea1nh v\u00e0o chi ti\u1ebft n\u1ed9i b\u1ed9 c\u1ee7a nhau. \u0110i\u1ec1u n\u00e0y khi\u1ebfn h\u1ec7 th\u1ed1ng tr\u1edf n\u00ean mong manh. N\u1ebfu b\u1ea1n thay \u0111\u1ed5i m\u1ed9t m\u00f4-\u0111un, b\u1ea1n c\u00f3 th\u1ec3 l\u00e0m h\u1ecfng nhi\u1ec1u m\u00f4-\u0111un kh\u00e1c. Vi\u1ec7c \u0111\u00f3ng g\u00f3i l\u00e0m gi\u1ea3m li\u00ean k\u1ebft b\u1eb1ng c\u00e1ch che gi\u1ea5u chi ti\u1ebft tri\u1ec3n khai. C\u00e1c m\u00f4-\u0111un kh\u00e1c ch\u1ec9 bi\u1ebft \u0111\u1ebfn giao di\u1ec7n c\u00f4ng khai, ch\u1ee9 kh\u00f4ng bi\u1ebft \u0111\u1ebfn c\u00e1ch ho\u1ea1t \u0111\u1ed9ng b\u00ean trong.<\/p>\n

      G\u1eafn k\u1ebft cao<\/h3>\n

      T\u00ednh g\u1eafn k\u1ebft m\u00f4 t\u1ea3 m\u1ee9c \u0111\u1ed9 li\u00ean quan gi\u1eefa c\u00e1c tr\u00e1ch nhi\u1ec7m c\u1ee7a m\u1ed9t m\u00f4-\u0111un duy nh\u1ea5t. M\u1ed9t m\u00f4-\u0111un g\u1eafn k\u1ebft cao l\u00e0m m\u1ed9t vi\u1ec7c v\u00e0 l\u00e0m t\u1ed1t vi\u1ec7c \u0111\u00f3. Vi\u1ec7c \u0111\u00f3ng g\u00f3i gi\u00fap \u0111\u1ea1t \u0111\u01b0\u1ee3c t\u00ednh g\u1eafn k\u1ebft cao b\u1eb1ng c\u00e1ch nh\u00f3m d\u1eef li\u1ec7u v\u00e0 ph\u01b0\u01a1ng th\u1ee9c li\u00ean quan l\u1ea1i v\u1edbi nhau. V\u00ed d\u1ee5, m\u1ed9t l\u1edbp \u201cPaymentProcessor\u201d n\u00ean x\u1eed l\u00fd t\u1ea5t c\u1ea3 logic li\u00ean quan \u0111\u1ebfn vi\u1ec7c x\u1eed l\u00fd thanh to\u00e1n, ch\u1ee9 kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t bi\u1ebfn duy nh\u1ea5t.<\/p>\n

      Khi b\u1ea1n c\u00f3 t\u00ednh g\u1eafn k\u1ebft cao v\u00e0 li\u00ean k\u1ebft th\u1ea5p, h\u1ec7 th\u1ed1ng tr\u1edf n\u00ean c\u00f3 t\u00ednh module. B\u1ea1n c\u00f3 th\u1ec3 thay th\u1ebf m\u1ed9t m\u00f4-\u0111un b\u1eb1ng m\u1ed9t tri\u1ec3n khai t\u1ed1t h\u01a1n m\u00e0 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn ph\u1ea7n c\u00f2n l\u1ea1i c\u1ee7a \u1ee9ng d\u1ee5ng. \u0110\u00e2y ch\u00ednh l\u00e0 b\u1ea3n ch\u1ea5t c\u1ee7a thi\u1ebft k\u1ebf linh ho\u1ea1t.<\/p>\n

      \ud83d\udee0\ufe0f Chi\u1ebfn l\u01b0\u1ee3c tri\u1ec3n khai<\/h2>\n

      C\u00f3 m\u1ed9t s\u1ed1 m\u1eabu v\u00e0 k\u1ef9 thu\u1eadt \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 tri\u1ec3n khai vi\u1ec7c \u0111\u00f3ng g\u00f3i m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. Hi\u1ec3u r\u00f5 nh\u1eefng \u0111i\u1ec1u n\u00e0y gi\u00fap vi\u1ebft m\u00e3 s\u1ea1ch h\u01a1n.<\/p>\n

      1. M\u1eabu Getter v\u00e0 Setter<\/h3>\n

      \u0110\u00e2y l\u00e0 c\u00e1ch ti\u1ebfp c\u1eadn truy\u1ec1n th\u1ed1ng nh\u1ea5t. B\u1ea1n cung c\u1ea5p c\u00e1c ph\u01b0\u01a1ng th\u1ee9c c\u00f4ng khai \u0111\u1ec3 \u0111\u1ecdc v\u00e0 ghi c\u00e1c tr\u01b0\u1eddng private. Tuy nhi\u00ean, thi\u1ebft k\u1ebf hi\u1ec7n \u0111\u1ea1i khuy\u00ean n\u00ean th\u1eadn tr\u1ecdng. C\u00e1c setter kh\u00f4ng gi\u1edbi h\u1ea1n c\u00f3 th\u1ec3 nguy hi\u1ec3m. Ch\u00fang cho ph\u00e9p m\u00e3 b\u00ean ngo\u00e0i b\u1ecf qua logic x\u00e1c th\u1ef1c n\u1ebfu kh\u00f4ng \u0111\u01b0\u1ee3c tri\u1ec3n khai c\u1ea9n th\u1eadn.<\/p>\n

      Thay v\u00ec cung c\u1ea5p m\u1ed9t setter cho m\u1ed7i tr\u01b0\u1eddng, h\u00e3y c\u00e2n nh\u1eafc cung c\u1ea5p m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c c\u1eadp nh\u1eadt tr\u1ea1ng th\u00e1i m\u1ed9t c\u00e1ch h\u1ee3p l\u00fd. V\u00ed d\u1ee5, thay v\u00ec m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c g\u1ecdi l\u00e0setBalance<\/code>, b\u1ea1n c\u00f3 th\u1ec3 c\u00f3 m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c g\u1ecdi l\u00e0addFunds<\/code>. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o c\u00e1c quy t\u1eafc kinh doanh v\u00e0 ng\u0103n ch\u1eb7n c\u00e1c tr\u1ea1ng th\u00e1i kh\u00f4ng h\u1ee3p l\u1ec7 nh\u01b0 \u0111\u1eb7t s\u1ed1 d\u01b0 v\u1ec1 zero n\u1ebfu t\u00e0i kho\u1ea3n \u0111\u00e3 \u0111\u00f3ng.<\/p>\n

      2. \u0110\u1ed1i t\u01b0\u1ee3ng b\u1ea5t bi\u1ebfn<\/h3>\n

      T\u00ednh b\u1ea5t bi\u1ebfn l\u00e0 h\u00ecnh th\u1ee9c bao \u0111\u00f3ng t\u1ed1i \u01b0u. M\u1ed9t khi \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c t\u1ea1o, tr\u1ea1ng th\u00e1i c\u1ee7a n\u00f3 kh\u00f4ng th\u1ec3 thay \u0111\u1ed5i. \u0110i\u1ec1u n\u00e0y lo\u1ea1i b\u1ecf r\u1ee7i ro thay \u0111\u1ed5i v\u00f4 t\u00ecnh b\u1edfi c\u00e1c ph\u1ea7n kh\u00e1c trong h\u1ec7 th\u1ed1ng. C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng b\u1ea5t bi\u1ebfn t\u1ef1 nhi\u00ean an to\u00e0n khi \u0111a lu\u1ed3ng v\u00ec tr\u1ea1ng th\u00e1i c\u1ee7a ch\u00fang kh\u00f4ng thay \u0111\u1ed5i, do \u0111\u00f3 kh\u00f4ng c\u1ea7n kh\u00f3a.<\/p>\n

      \u0110\u1ec3 t\u1ea1o ra m\u1ed9t tr\u1ea1ng th\u00e1i m\u1edbi, b\u1ea1n t\u1ea1o m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng m\u1edbi. C\u00e1ch ti\u1ebfp c\u1eadn n\u00e0y \u0111\u01a1n gi\u1ea3n h\u00f3a vi\u1ec7c suy lu\u1eadn v\u1ec1 m\u00e3 ngu\u1ed3n, v\u00ec b\u1ea1n bi\u1ebft r\u1eb1ng m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng m\u00e0 b\u1ea1n \u0111ang gi\u1eef s\u1ebd kh\u00f4ng thay \u0111\u1ed5i trong khi b\u1ea1n \u0111ang s\u1eed d\u1ee5ng n\u00f3.<\/p>\n

      3. T\u00e1ch bi\u1ec7t giao di\u1ec7n<\/h3>\n

      \u0110\u1eebng ti\u1ebft l\u1ed9 m\u1ecdi th\u1ee9. T\u1ea1o c\u00e1c giao di\u1ec7n c\u1ee5 th\u1ec3 cho c\u00e1c nhu c\u1ea7u c\u1ee5 th\u1ec3. N\u1ebfu m\u1ed9t l\u1edbp c\u00f3 m\u01b0\u1eddi ph\u01b0\u01a1ng th\u1ee9c c\u00f4ng khai, nh\u01b0ng m\u1ed9t kh\u00e1ch h\u00e0ng c\u1ee5 th\u1ec3 ch\u1ec9 c\u1ea7n ba, h\u00e3y ti\u1ebft l\u1ed9 ch\u1ec9 ba ph\u01b0\u01a1ng th\u1ee9c \u0111\u00f3. \u0110i\u1ec1u n\u00e0y gi\u1ea3m di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t c\u00f3 th\u1ec3 b\u1ecb l\u1ea1m d\u1ee5ng v\u00e0 gi\u1eef cho h\u1ee3p \u0111\u1ed3ng r\u00f5 r\u00e0ng.<\/p>\n

      \u26a0\ufe0f Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn<\/h2>\n

      Ngay c\u1ea3 v\u1edbi nh\u1eefng \u00fd \u0111\u1ecbnh t\u1ed1t nh\u1ea5t, c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n th\u01b0\u1eddng r\u01a1i v\u00e0o nh\u1eefng c\u00e1i b\u1eaby l\u00e0m suy y\u1ebfu t\u00ednh bao \u0111\u00f3ng.<\/p>\n

        \n
      • \u0110\u1ed1i t\u01b0\u1ee3ng Th\u1ea7n (God Objects):<\/strong>C\u00e1c l\u1edbp bi\u1ebft qu\u00e1 nhi\u1ec1u v\u1ec1 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c. \u0110i\u1ec1u n\u00e0y t\u1ea1o ra s\u1ef1 g\u1eafn k\u1ebft ch\u1eb7t ch\u1ebd v\u00e0 vi ph\u1ea1m nguy\u00ean t\u1eafc t\u00e1ch bi\u1ec7t tr\u00e1ch nhi\u1ec7m.<\/li>\n
      • Tr\u01b0\u1eddng c\u00f4ng khai:<\/strong>Khai b\u00e1o c\u00e1c tr\u01b0\u1eddng l\u00e0 c\u00f4ng khai lo\u1ea1i b\u1ecf kh\u1ea3 n\u0103ng x\u00e1c th\u1ef1c ho\u1eb7c ghi nh\u1eadt k\u00fd truy c\u1eadp. \u0110i\u1ec1u n\u00e0y n\u00ean \u0111\u01b0\u1ee3c tr\u00e1nh.<\/li>\n
      • Bao \u0111\u00f3ng qu\u00e1 m\u1ee9c:<\/strong>Che gi\u1ea5u d\u1eef li\u1ec7u c\u1ea7n \u0111\u01b0\u1ee3c chia s\u1ebb gi\u1eefa c\u00e1c module c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn m\u00e3 ngu\u1ed3n d\u00e0i d\u00f2ng. H\u00e3y t\u00ecm s\u1ef1 c\u00e2n b\u1eb1ng gi\u1eefa b\u1ea3o m\u1eadt v\u00e0 kh\u1ea3 n\u0103ng s\u1eed d\u1ee5ng.<\/li>\n
      • Vi ph\u1ea1m c\u00e1c b\u1ea5t bi\u1ebfn:<\/strong>Cho ph\u00e9p m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c \u0111\u01b0a \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0o tr\u1ea1ng th\u00e1i vi ph\u1ea1m b\u1ea5t bi\u1ebfn, ngay c\u1ea3 t\u1ea1m th\u1eddi, c\u00f3 th\u1ec3 g\u00e2y ra c\u00e1c \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh ho\u1eb7c l\u1ed7i logic.<\/li>\n<\/ul>\n

        \ud83d\udd04 T\u01b0\u01a1ng t\u00e1c v\u1edbi c\u00e1c nguy\u00ean t\u1eafc kh\u00e1c<\/h2>\n

        T\u00ednh bao \u0111\u00f3ng kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng m\u1ed9t c\u00e1ch c\u00f4 l\u1eadp. N\u00f3 t\u01b0\u01a1ng t\u00e1c ch\u1eb7t ch\u1ebd v\u1edbi c\u00e1c nguy\u00ean t\u1eafc thi\u1ebft k\u1ebf kh\u00e1c.<\/p>\n

        Tr\u1eebu t\u01b0\u1ee3ng h\u00f3a<\/h3>\n

        Trong khi bao \u0111\u00f3ng che gi\u1ea5u chi ti\u1ebft tri\u1ec3n khai, tr\u1eebu t\u01b0\u1ee3ng h\u00f3a \u0111\u1ecbnh ngh\u0129a giao di\u1ec7n. Bao \u0111\u00f3ng l\u00e0 “c\u00e1ch th\u1ee9c” (che gi\u1ea5u d\u1eef li\u1ec7u), c\u00f2n tr\u1eebu t\u01b0\u1ee3ng h\u00f3a l\u00e0 “\u0111i\u1ec1u g\u00ec” (\u0111\u1ecbnh ngh\u0129a h\u00e0nh vi). B\u1ea1n kh\u00f4ng th\u1ec3 c\u00f3 tr\u1eebu t\u01b0\u1ee3ng h\u00f3a hi\u1ec7u qu\u1ea3 m\u00e0 kh\u00f4ng c\u00f3 bao \u0111\u00f3ng, v\u00ec tr\u1eebu t\u01b0\u1ee3ng h\u00f3a ph\u1ee5 thu\u1ed9c v\u00e0o vi\u1ec7c c\u00e1c chi ti\u1ebft n\u1ed9i b\u1ed9 \u0111\u01b0\u1ee3c che gi\u1ea5u.<\/p>\n

        K\u1ebf th\u1eeba<\/h3>\n

        K\u1ebf th\u1eeba cho ph\u00e9p m\u1ed9t l\u1edbp thu \u0111\u01b0\u1ee3c c\u00e1c thu\u1ed9c t\u00ednh t\u1eeb l\u1edbp kh\u00e1c. Bao \u0111\u00f3ng \u0111\u1ea3m b\u1ea3o r\u1eb1ng l\u1edbp cha kh\u00f4ng ti\u1ebft l\u1ed9 tri\u1ec3n khai n\u1ed9i b\u1ed9 c\u1ee7a n\u00f3 cho l\u1edbp con tr\u1eeb khi c\u1ea7n thi\u1ebft. N\u1ebfu l\u1edbp cha ph\u1ee5 thu\u1ed9c v\u00e0o c\u1ea5u tr\u00fac n\u1ed9i b\u1ed9 c\u1ee7a n\u00f3, l\u1edbp con s\u1ebd tr\u1edf n\u00ean ph\u1ee5 thu\u1ed9c v\u00e0o c\u1ea5u tr\u00fac \u0111\u00f3, l\u00e0m gi\u1ea3m t\u00ednh linh ho\u1ea1t.<\/p>\n

        \u0110a h\u00ecnh<\/h3>\n

        \u0110a h\u00ecnh cho ph\u00e9p c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c x\u1eed l\u00fd nh\u01b0 th\u1ec3 ch\u00fang l\u00e0 th\u1ec3 hi\u1ec7n c\u1ee7a l\u1edbp cha thay v\u00ec l\u1edbp th\u1ef1c s\u1ef1 c\u1ee7a ch\u00fang. Bao \u0111\u00f3ng \u0111\u1ea3m b\u1ea3o r\u1eb1ng giao di\u1ec7n chung \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a b\u1edfi l\u1edbp cha l\u00e0 c\u00e1ch duy nh\u1ea5t \u0111\u1ec3 t\u01b0\u01a1ng t\u00e1c v\u1edbi \u0111\u1ed1i t\u01b0\u1ee3ng. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p c\u00e1c tri\u1ec3n khai kh\u00e1c nhau \u0111\u01b0\u1ee3c thay th\u1ebf m\u00e0 kh\u00f4ng c\u1ea7n thay \u0111\u1ed5i m\u00e3 ngu\u1ed3n s\u1eed d\u1ee5ng ch\u00fang.<\/p>\n

        \ud83d\ude80 B\u1ea3o v\u1ec7 t\u01b0\u01a1ng lai v\u00e0 b\u1ea3o tr\u00ec<\/h2>\n

        C\u00e1c h\u1ec7 th\u1ed1ng ph\u1ea7n m\u1ec1m ph\u00e1t tri\u1ec3n theo th\u1eddi gian. Y\u00eau c\u1ea7u thay \u0111\u1ed5i. C\u00f4ng ngh\u1ec7 c\u1eadp nh\u1eadt. Bao \u0111\u00f3ng l\u00e0 m\u1ed9t chi\u1ebfn l\u01b0\u1ee3c cho s\u1ef1 b\u1ec1n v\u1eefng.<\/p>\n

        T\u00e1i c\u1ea5u tr\u00fac<\/h3>\n

        Khi b\u1ea1n c\u1ea7n t\u00e1i c\u1ea5u tr\u00fac m\u00e3 ngu\u1ed3n, bao \u0111\u00f3ng l\u00e0m cho vi\u1ec7c n\u00e0y an to\u00e0n h\u01a1n. N\u1ebfu logic n\u1ed9i b\u1ed9 c\u1ee7a m\u1ed9t l\u1edbp thay \u0111\u1ed5i, nh\u01b0ng giao di\u1ec7n c\u00f4ng khai v\u1eabn gi\u1eef nguy\u00ean, ph\u1ea7n c\u00f2n l\u1ea1i c\u1ee7a h\u1ec7 th\u1ed1ng s\u1ebd kh\u00f4ng b\u1ecb \u1ea3nh h\u01b0\u1edfng. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p c\u00e1c \u0111\u1ed9i c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t ho\u1eb7c s\u1eeda l\u1ed7i m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ea3i vi\u1ebft l\u1ea1i to\u00e0n b\u1ed9 m\u00e3 ngu\u1ed3n ph\u1ee5 thu\u1ed9c.<\/p>\n

        Ki\u1ec3m th\u1eed<\/h3>\n

        Ki\u1ec3m th\u1eed \u0111\u01a1n v\u1ecb d\u1ef1a v\u00e0o vi\u1ec7c t\u00e1ch bi\u1ec7t c\u00e1c th\u00e0nh ph\u1ea7n. Bao \u0111\u00f3ng h\u1ed7 tr\u1ee3 \u0111i\u1ec1u n\u00e0y b\u1eb1ng c\u00e1ch cho ph\u00e9p b\u1ea1n ki\u1ec3m th\u1eed m\u1ed9t l\u1edbp m\u1ed9t c\u00e1ch \u0111\u1ed9c l\u1eadp. B\u1ea1n kh\u00f4ng c\u1ea7n thi\u1ebft l\u1eadp to\u00e0n b\u1ed9 m\u00f4i tr\u01b0\u1eddng \u0111\u1ec3 ki\u1ec3m th\u1eed m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c duy nh\u1ea5t. B\u1ea1n c\u00f3 th\u1ec3 gi\u1ea3 l\u1eadp \u0111\u1ea7u v\u00e0o v\u00e0 x\u00e1c minh \u0111\u1ea7u ra m\u00e0 kh\u00f4ng c\u1ea7n lo l\u1eafng v\u1ec1 tr\u1ea1ng th\u00e1i n\u1ed9i b\u1ed9 c\u1ee7a c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c.<\/p>\n

        B\u1ea3o m\u1eadt<\/h3>\n

        Trong c\u00e1c \u1ee9ng d\u1ee5ng nh\u1ea1y c\u1ea3m v\u1ec1 b\u1ea3o m\u1eadt, vi\u1ec7c \u1ea9n d\u1eef li\u1ec7u l\u00e0 \u0111i\u1ec1u quan tr\u1ecdng. T\u00ednh \u0111\u00f3ng g\u00f3i ng\u0103n ch\u1eb7n truy c\u1eadp kh\u00f4ng \u0111\u01b0\u1ee3c ph\u00e9p v\u00e0o c\u00e1c tr\u01b0\u1eddng nh\u1ea1y c\u1ea3m nh\u01b0 m\u1eadt kh\u1ea9u, m\u00e3 th\u00f4ng b\u00e1o ho\u1eb7c th\u00f4ng tin c\u00e1 nh\u00e2n. N\u00f3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng ch\u1ec9 c\u00f3 c\u00e1c ph\u01b0\u01a1ng th\u1ee9c \u0111\u01b0\u1ee3c \u1ee7y quy\u1ec1n m\u1edbi c\u00f3 th\u1ec3 x\u1eed l\u00fd d\u1eef li\u1ec7u n\u00e0y, t\u1eeb \u0111\u00f3 gi\u1ea3m di\u1ec7n t\u00edch t\u1ea5n c\u00f4ng.<\/p>\n

        \ud83e\udde9 Nh\u1eefng c\u00e2n nh\u1eafc n\u00e2ng cao<\/h2>\n

        Khi h\u1ec7 th\u1ed1ng ph\u00e1t tri\u1ec3n, vi\u1ec7c \u00e1p d\u1ee5ng t\u00ednh \u0111\u00f3ng g\u00f3i tr\u1edf n\u00ean tinh t\u1ebf h\u01a1n.<\/p>\n

        An to\u00e0n khi \u0111a lu\u1ed3ng<\/h3>\n

        Trong m\u00f4i tr\u01b0\u1eddng \u0111\u1ed3ng th\u1eddi, nhi\u1ec1u lu\u1ed3ng c\u00f3 th\u1ec3 truy c\u1eadp c\u00f9ng m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng. T\u00ednh \u0111\u00f3ng g\u00f3i h\u1ed7 tr\u1ee3 b\u1eb1ng c\u00e1ch qu\u1ea3n l\u00fd truy c\u1eadp tr\u1ea1ng th\u00e1i th\u00f4ng qua c\u00e1c ph\u01b0\u01a1ng th\u1ee9c \u0111\u1ed3ng b\u1ed9. N\u1ebfu tr\u1ea1ng th\u00e1i n\u1ed9i b\u1ed9 \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 ri\u00eang t\u01b0 v\u00e0 ch\u1ec9 \u0111\u01b0\u1ee3c thay \u0111\u1ed5i th\u00f4ng qua c\u00e1c ph\u01b0\u01a1ng th\u1ee9c \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t, vi\u1ec7c \u0111\u1ea3m b\u1ea3o an to\u00e0n khi \u0111a lu\u1ed3ng s\u1ebd d\u1ec5 d\u00e0ng h\u01a1n.<\/p>\n

        Ch\u00e8n ph\u1ee5 thu\u1ed9c<\/h3>\n

        T\u00ednh \u0111\u00f3ng g\u00f3i ho\u1ea1t \u0111\u1ed9ng song song v\u1edbi ch\u00e8n ph\u1ee5 thu\u1ed9c. Thay v\u00ec t\u1ea1o ra c\u00e1c ph\u1ee5 thu\u1ed9c b\u00ean trong m\u1ed9t l\u1edbp, ch\u00fang \u0111\u01b0\u1ee3c truy\u1ec1n t\u1eeb b\u00ean ngo\u00e0i v\u00e0o. \u0110i\u1ec1u n\u00e0y gi\u00fap l\u1edbp duy tr\u00ec t\u1eadp trung v\u00e0o tr\u00e1ch nhi\u1ec7m ch\u00ednh c\u1ee7a n\u00f3. \u0110\u1ed3ng th\u1eddi, n\u00f3 c\u0169ng l\u00e0m cho l\u1edbp d\u1ec5 ki\u1ec3m th\u1eed h\u01a1n v\u00ec b\u1ea1n c\u00f3 th\u1ec3 ch\u00e8n c\u00e1c ph\u1ee5 thu\u1ed9c gi\u1ea3.<\/p>\n

        Thi\u1ebft k\u1ebf API<\/h3>\n

        Khi x\u00e2y d\u1ef1ng th\u01b0 vi\u1ec7n ho\u1eb7c API, t\u00ednh \u0111\u00f3ng g\u00f3i x\u00e1c \u0111\u1ecbnh h\u1ee3p \u0111\u1ed3ng. B\u1ea1n quy\u1ebft \u0111\u1ecbnh ph\u1ea7n n\u00e0o thu\u1ed9c API c\u00f4ng khai v\u00e0 ph\u1ea7n n\u00e0o l\u00e0 tri\u1ec3n khai n\u1ed9i b\u1ed9. Vi\u1ec7c thay \u0111\u1ed5i tri\u1ec3n khai n\u1ed9i b\u1ed9 c\u1ea7n ph\u1ea3i t\u01b0\u01a1ng th\u00edch ng\u01b0\u1ee3c v\u1edbi API c\u00f4ng khai. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o ng\u01b0\u1eddi d\u00f9ng th\u01b0 vi\u1ec7n c\u1ee7a b\u1ea1n kh\u00f4ng ph\u1ea3i c\u1eadp nh\u1eadt m\u00e3 ngu\u1ed3n m\u1ed7i khi b\u1ea1n c\u1ea3i thi\u1ec7n logic n\u1ed9i b\u1ed9.<\/p>\n

        \ud83d\udcdd T\u00f3m t\u1eaft c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t<\/h2>\n

        \u0110\u1ec3 tri\u1ec3n khai t\u00ednh \u0111\u00f3ng g\u00f3i m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3, h\u00e3y tu\u00e2n theo c\u00e1c h\u01b0\u1edbng d\u1eabn sau:<\/p>\n

          \n
        • M\u1eb7c \u0111\u1ecbnh l\u00e0 ri\u00eang t\u01b0:<\/strong>Gi\u1eef c\u00e1c tr\u01b0\u1eddng \u1edf ch\u1ebf \u0111\u1ed9 ri\u00eang t\u01b0 tr\u1eeb khi c\u00f3 l\u00fd do thuy\u1ebft ph\u1ee5c \u0111\u1ec3 c\u00f4ng khai ch\u00fang.<\/li>\n
        • X\u00e1c th\u1ef1c \u0111\u1ea7u v\u00e0o:<\/strong>\u0110\u1ea3m b\u1ea3o m\u1ecdi d\u1eef li\u1ec7u \u0111i v\u00e0o \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ec1u \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u.<\/li>\n
        • T\u1ed1i thi\u1ec3u h\u00f3a ph\u01b0\u01a1ng th\u1ee9c c\u00f4ng khai:<\/strong>Ch\u1ec9 c\u00f4ng khai nh\u1eefng g\u00ec c\u1ea7n thi\u1ebft cho giao di\u1ec7n.<\/li>\n
        • S\u1eed d\u1ee5ng \u0111\u1ed1i t\u01b0\u1ee3ng b\u1ea5t bi\u1ebfn:<\/strong>\u01afu ti\u00ean b\u1ea5t bi\u1ebfn khi c\u00f3 th\u1ec3 \u0111\u1ec3 gi\u1ea3m \u0111\u1ed9 ph\u1ee9c t\u1ea1p qu\u1ea3n l\u00fd tr\u1ea1ng th\u00e1i.<\/li>\n
        • T\u00e0i li\u1ec7u h\u00e0nh vi:<\/strong>Li\u00ean t\u1ee5c t\u00e0i li\u1ec7u r\u00f5 r\u00e0ng v\u1ec1 vi\u1ec7c c\u00e1c ph\u01b0\u01a1ng th\u1ee9c c\u00f4ng khai l\u00e0m g\u00ec, ch\u1ee9 kh\u00f4ng ph\u1ea3i c\u00e1ch ch\u00fang l\u00e0m \u0111i\u1ec1u \u0111\u00f3.<\/li>\n
        • Tr\u00e1nh r\u00f2 r\u1ec9:<\/strong>Kh\u00f4ng tr\u1ea3 v\u1ec1 tham chi\u1ebfu \u0111\u1ebfn c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng n\u1ed9i b\u1ed9 c\u00f3 th\u1ec3 thay \u0111\u1ed5i.<\/li>\n<\/ul>\n

          B\u1eb1ng c\u00e1ch tu\u00e2n th\u1ee7 c\u00e1c th\u1ef1c h\u00e0nh n\u00e0y, c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n t\u1ea1o ra c\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng ch\u1ecbu v\u1edbi s\u1ef1 thay \u0111\u1ed5i. T\u00ednh \u0111\u00f3ng g\u00f3i kh\u00f4ng ch\u1ec9 l\u00e0 y\u00eau c\u1ea7u k\u1ef9 thu\u1eadt; \u0111\u00f3 l\u00e0 m\u1ed9t k\u1ef7 lu\u1eadt d\u1eabn \u0111\u1ebfn ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m t\u1ed1t h\u01a1n. N\u00f3 bu\u1ed9c nh\u00e0 ph\u00e1t tri\u1ec3n ph\u1ea3i suy ngh\u0129 v\u1ec1 c\u00e1c ranh gi\u1edbi v\u00e0 t\u01b0\u01a1ng t\u00e1c, d\u1eabn \u0111\u1ebfn m\u00e3 ngu\u1ed3n \u0111\u01b0\u1ee3c t\u1ed5 ch\u1ee9c v\u00e0 logic h\u01a1n.<\/p>\n

          H\u00e3y nh\u1edb r\u1eb1ng m\u1ee5c ti\u00eau kh\u00f4ng ph\u1ea3i l\u00e0 che gi\u1ea5u m\u1ecdi th\u1ee9, m\u00e0 l\u00e0 ki\u1ec3m so\u00e1t lu\u1ed3ng th\u00f4ng tin. Khi d\u1eef li\u1ec7u ch\u1ea3y qua c\u00e1c k\u00eanh \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t, c\u00e1c l\u1ed7i s\u1ebd \u0111\u01b0\u1ee3c ph\u00e1t hi\u1ec7n s\u1edbm, v\u00e0 h\u1ec7 th\u1ed1ng duy tr\u00ec \u1ed5n \u0111\u1ecbnh. S\u1ef1 \u1ed5n \u0111\u1ecbnh n\u00e0y l\u00e0 n\u1ec1n t\u1ea3ng cho ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m \u0111\u00e1ng tin c\u1eady.<\/p>\n

          Khi b\u1ea1n ti\u1ebfp t\u1ee5c thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng, h\u00e3y lu\u00f4n ghi nh\u1edb nguy\u00ean t\u1eafc \u0111\u00f3ng g\u00f3i. \u0110\u00f3 l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5, khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u00fang c\u00e1ch, s\u1ebd \u0111\u01a1n gi\u1ea3n h\u00f3a \u0111\u1ed9 ph\u1ee9c t\u1ea1p v\u00e0 n\u00e2ng cao ch\u1ea5t l\u01b0\u1ee3ng c\u00f4ng vi\u1ec7c c\u1ee7a b\u1ea1n. N\u00f3 bi\u1ebfn m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c bi\u1ebfn v\u00e0 h\u00e0m th\u00e0nh m\u1ed9t th\u1ef1c th\u1ec3 c\u00f3 c\u1ea5u tr\u00fac, logic, ph\u1ee5c v\u1ee5 nhu c\u1ea7u c\u1ee7a \u1ee9ng d\u1ee5ng m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n","protected":false},"excerpt":{"rendered":"

          Bao \u0111\u00f3ng \u0111\u1ee9ng v\u1eefng nh\u01b0 m\u1ed9t trong nh\u1eefng tr\u1ee5 c\u1ed9t n\u1ec1n t\u1ea3ng c\u1ee7a thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. \u0110\u00f3 l\u00e0 c\u01a1 ch\u1ebf cho ph\u00e9p c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ea7n m\u1ec1m qu\u1ea3n…<\/p>\n","protected":false},"author":1,"featured_media":1911,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"Nguy\u00ean t\u1eafc \u0111\u00f3ng g\u00f3i trong thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng \ud83e\uddf1","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1c nguy\u00ean t\u1eafc c\u1ed1t l\u00f5i c\u1ee7a \u0111\u00f3ng g\u00f3i trong OOP. Hi\u1ec3u v\u1ec1 \u1ea9n d\u1eef li\u1ec7u, ki\u1ec3m so\u00e1t truy c\u1eadp v\u00e0 c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t cho ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m b\u1ec1n v\u1eefng.","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[94],"tags":[87,93],"class_list":["post-1910","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-object-oriented-analysis-and-design","tag-academic","tag-object-oriented-analysis-and-design"],"yoast_head":"\nNguy\u00ean t\u1eafc \u0111\u00f3ng g\u00f3i trong thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng \ud83e\uddf1<\/title>\n<meta name=\"description\" content=\"H\u1ecdc c\u00e1c nguy\u00ean t\u1eafc c\u1ed1t l\u00f5i c\u1ee7a \u0111\u00f3ng g\u00f3i trong OOP. 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