{"id":1860,"date":"2026-03-25T13:53:00","date_gmt":"2026-03-25T13:53:00","guid":{"rendered":"https:\/\/www.tech-posts.com\/vi\/managing-coupling-and-cohesion-effectively\/"},"modified":"2026-03-25T13:53:00","modified_gmt":"2026-03-25T13:53:00","slug":"managing-coupling-and-cohesion-effectively","status":"publish","type":"post","link":"https:\/\/www.tech-posts.com\/vi\/managing-coupling-and-cohesion-effectively\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn OOAD: Qu\u1ea3n l\u00fd S\u1ef1 li\u00ean k\u1ebft v\u00e0 T\u00ednh g\u1eafn k\u1ebft m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3"},"content":{"rendered":"
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\"Child-drawing<\/figure>\n<\/div>\n

Trong b\u1ed1i c\u1ea3nh Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng, hai ch\u1ec9 s\u1ed1 \u0111\u1ecbnh ngh\u0129a s\u1ee9c kh\u1ecfe c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng: s\u1ef1 li\u00ean k\u1ebft v\u00e0 t\u00ednh g\u1eafn k\u1ebft. Nh\u1eefng kh\u00e1i ni\u1ec7m n\u00e0y kh\u00f4ng ch\u1ec9 l\u00e0 nh\u1eefng thu\u1eadt ng\u1eef h\u1ecdc thu\u1eadt; ch\u00fang l\u00e0 n\u1ec1n t\u1ea3ng cho ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m d\u1ec5 b\u1ea3o tr\u00ec, m\u1edf r\u1ed9ng v\u00e0 b\u1ec1n v\u1eefng. Khi c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n hi\u1ec3u \u0111\u01b0\u1ee3c c\u00e1ch c\u00e1c module t\u01b0\u01a1ng t\u00e1c v\u00e0 c\u00e1ch ph\u00e2n b\u1ed5 tr\u00e1ch nhi\u1ec7m, h\u1ecd s\u1ebd t\u1ea1o ra nh\u1eefng h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 th\u00edch nghi v\u1edbi thay \u0111\u1ed5i thay v\u00ec b\u1ecb g\u00e3y v\u1ee1 d\u01b0\u1edbi \u00e1p l\u1ef1c.<\/p>\n

H\u01b0\u1edbng d\u1eabn n\u00e0y kh\u00e1m ph\u00e1 c\u01a1 ch\u1ebf c\u1ee7a nh\u1eefng nguy\u00ean t\u1eafc n\u00e0y. Ch\u00fang ta s\u1ebd ph\u00e2n t\u00edch c\u00e1c lo\u1ea1i g\u1eafn k\u1ebft v\u00e0 s\u1ef1 li\u00ean k\u1ebft, \u0111\u00e1nh gi\u00e1 t\u00e1c \u0111\u1ed9ng c\u1ee7a ch\u00fang \u0111\u1ebfn v\u00f2ng \u0111\u1eddi ph\u00e1t tri\u1ec3n, v\u00e0 cung c\u1ea5p c\u00e1c chi\u1ebfn l\u01b0\u1ee3c th\u1ef1c t\u1ebf \u0111\u1ec3 tinh ch\u1ec9nh thi\u1ebft k\u1ebf c\u1ee7a b\u1ea1n. B\u1eb1ng c\u00e1ch t\u1eadp trung v\u00e0o nh\u1eefng y\u1ebfu t\u1ed1 c\u1ea5u tr\u00fac n\u00e0y, c\u00e1c \u0111\u1ed9i nh\u00f3m c\u00f3 th\u1ec3 gi\u1ea3m n\u1ee3 k\u1ef9 thu\u1eadt v\u00e0 c\u1ea3i thi\u1ec7n ch\u1ea5t l\u01b0\u1ee3ng m\u00e3 ngu\u1ed3n t\u1ed5ng th\u1ec3.<\/p>\n

Hi\u1ec3u v\u1ec1 T\u00ednh g\u1eafn k\u1ebft: S\u1ee9c m\u1ea1nh n\u1ed9i t\u1ea1i \ud83e\uddf1<\/h2>\n

T\u00ednh g\u1eafn k\u1ebft \u0111\u1ec1 c\u1eadp \u0111\u1ebfn m\u1ee9c \u0111\u1ed9 li\u00ean quan ch\u1eb7t ch\u1ebd gi\u1eefa c\u00e1c tr\u00e1ch nhi\u1ec7m b\u00ean trong m\u1ed9t module, l\u1edbp ho\u1eb7c th\u00e0nh ph\u1ea7n duy nh\u1ea5t. G\u1eafn k\u1ebft cao c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t module th\u1ef1c hi\u1ec7n m\u1ed9t nhi\u1ec7m v\u1ee5 duy nh\u1ea5t, r\u00f5 r\u00e0ng. G\u1eafn k\u1ebft th\u1ea5p ng\u1ee5 \u00fd r\u1eb1ng m\u1ed9t module \u0111ang c\u1ed1 g\u1eafng th\u1ef1c hi\u1ec7n qu\u00e1 nhi\u1ec1u vi\u1ec7c kh\u00f4ng li\u00ean quan.<\/p>\n

H\u00e3y ngh\u0129 \u0111\u1ebfn m\u1ed9t b\u1ed9 c\u00f4ng c\u1ee5. M\u1ed9t c\u00e1i b\u00faa c\u00f3 t\u00ednh g\u1eafn k\u1ebft r\u1ea5t cao; n\u00f3 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf cho m\u1ed9t c\u00f4ng vi\u1ec7c duy nh\u1ea5t. M\u1ed9t chi\u1ebfc dao \u0111a n\u0103ng Th\u1ee5y S\u0129 c\u00f3 t\u00ednh g\u1eafn k\u1ebft th\u1ea5p h\u01a1n v\u00ec n\u00f3 k\u1ebft h\u1ee3p c\u00e1c ch\u1ee9c n\u0103ng c\u1eaft, v\u1eb7n v\u00edt v\u00e0 m\u1edf v\u00e0o m\u1ed9t c\u00f4ng c\u1ee5 duy nh\u1ea5t. D\u00f9 t\u00ednh linh ho\u1ea1t c\u00f3 ch\u1ed7 \u0111\u1ee9ng c\u1ee7a n\u00f3, trong thi\u1ebft k\u1ebf ph\u1ea7n m\u1ec1m, ch\u00fang ta th\u01b0\u1eddng \u01b0u ti\u00ean c\u00e1ch ti\u1ebfp c\u1eadn gi\u1ed1ng nh\u01b0 c\u00e1i b\u00faa.<\/p>\n

C\u00e1c lo\u1ea1i g\u1eafn k\u1ebft<\/h3>\n

Kh\u00f4ng ph\u1ea3i m\u1ecdi g\u1eafn k\u1ebft n\u00e0o c\u0169ng nh\u01b0 nhau. B\u1ea3ng sau \u0111\u00e2y tr\u00ecnh b\u00e0y d\u1ea3i t\u1eeb g\u1eafn k\u1ebft th\u1ea5p \u0111\u1ebfn g\u1eafn k\u1ebft cao:<\/p>\n\n\n\n\n\n\n\n\n\n
M\u1ee9c \u0111\u1ed9<\/th>\nLo\u1ea1i<\/th>\nM\u00f4 t\u1ea3<\/th>\n<\/tr>\n
Th\u1ea5p<\/td>\nNg\u1eabu nhi\u00ean<\/td>\nC\u00e1c th\u00e0nh ph\u1ea7n \u0111\u01b0\u1ee3c nh\u00f3m l\u1ea1i m\u1ed9t c\u00e1ch ng\u1eabu nhi\u00ean m\u00e0 kh\u00f4ng c\u00f3 m\u1ed1i quan h\u1ec7 \u00fd ngh\u0129a n\u00e0o.<\/td>\n<\/tr>\n
Th\u1ea5p<\/td>\nLogic<\/td>\nC\u00e1c th\u00e0nh ph\u1ea7n \u0111\u01b0\u1ee3c nh\u00f3m l\u1ea1i v\u00ec ch\u00fang c\u00f3 t\u00ednh ch\u1ea5t logic t\u01b0\u01a1ng t\u1ef1 (v\u00ed d\u1ee5: t\u1ea5t c\u1ea3 c\u00e1c h\u00e0m in b\u00e1o c\u00e1o).<\/td>\n<\/tr>\n
Th\u1ea5p<\/td>\nTh\u1eddi gian<\/td>\nC\u00e1c th\u00e0nh ph\u1ea7n \u0111\u01b0\u1ee3c nh\u00f3m l\u1ea1i v\u00ec ch\u00fang \u0111\u01b0\u1ee3c th\u1ef1c thi c\u00f9ng m\u1ed9t l\u00fac (v\u00ed d\u1ee5: c\u00e1c th\u1ee7 t\u1ee5c kh\u1edfi t\u1ea1o).<\/td>\n<\/tr>\n
Trung b\u00ecnh<\/td>\nTh\u1ee7 t\u1ee5c<\/td>\nC\u00e1c th\u00e0nh ph\u1ea7n \u0111\u01b0\u1ee3c nh\u00f3m l\u1ea1i v\u00ec ch\u00fang ph\u1ea3i \u0111\u01b0\u1ee3c th\u1ef1c thi theo m\u1ed9t tr\u00ecnh t\u1ef1 c\u1ee5 th\u1ec3.<\/td>\n<\/tr>\n
Trung b\u00ecnh<\/td>\nGiao ti\u1ebfp<\/td>\nC\u00e1c th\u00e0nh ph\u1ea7n \u0111\u01b0\u1ee3c nh\u00f3m l\u1ea1i v\u00ec ch\u00fang thao t\u00e1c tr\u00ean c\u00f9ng m\u1ed9t d\u1eef li\u1ec7u.<\/td>\n<\/tr>\n
Cao<\/td>\nTheo th\u1ee9 t\u1ef1<\/td>\n\u0110\u1ea7u ra c\u1ee7a m\u1ed9t th\u00e0nh ph\u1ea7n l\u00e0 \u0111\u1ea7u v\u00e0o cho th\u00e0nh ph\u1ea7n ti\u1ebfp theo.<\/td>\n<\/tr>\n
Cao<\/td>\nCh\u1ee9c n\u0103ng<\/td>\nT\u1ea5t c\u1ea3 c\u00e1c th\u00e0nh ph\u1ea7n \u0111\u1ec1u \u0111\u00f3ng g\u00f3p v\u00e0o m\u1ed9t nhi\u1ec7m v\u1ee5 c\u1ee5 th\u1ec3 duy nh\u1ea5t.<\/td>\n<\/tr>\n<\/table>\n

Ch\u1ee9c n\u0103ng v\u00e0 s\u1ef1 g\u1eafn k\u1ebft theo th\u1ee9 t\u1ef1 l\u00e0 m\u1ee5c ti\u00eau c\u1ee7a c\u00e1c module \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf t\u1ed1t. Khi m\u1ed9t l\u1edbp th\u1ec3 hi\u1ec7n s\u1ef1 g\u1eafn k\u1ebft ch\u1ee9c n\u0103ng, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 m\u1ecdi ph\u01b0\u01a1ng th\u1ee9c trong l\u1edbp \u0111\u00f3 \u0111\u1ec1u \u0111\u00f3ng g\u00f3p v\u00e0o m\u1ed9t m\u1ee5c ti\u00eau c\u1ee5 th\u1ec3. \u0110i\u1ec1u n\u00e0y khi\u1ebfn l\u1edbp tr\u1edf n\u00ean d\u1ec5 hi\u1ec3u, d\u1ec5 ki\u1ec3m th\u1eed v\u00e0 d\u1ec5 s\u1eeda \u0111\u1ed5i h\u01a1n.<\/p>\n

L\u1ee3i \u00edch c\u1ee7a s\u1ef1 g\u1eafn k\u1ebft cao<\/h3>\n
    \n
  • Kh\u1ea3 n\u0103ng \u0111\u1ecdc hi\u1ec3u:<\/strong>C\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u00f3 th\u1ec3 hi\u1ec3u nhanh m\u1ee5c \u0111\u00edch c\u1ee7a m\u1ed9t module.<\/li>\n
  • Kh\u1ea3 n\u0103ng t\u00e1i s\u1eed d\u1ee5ng:<\/strong>M\u1ed9t module t\u1eadp trung c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c di chuy\u1ec3n sang c\u00e1c ph\u1ea7n kh\u00e1c c\u1ee7a h\u1ec7 th\u1ed1ng v\u1edbi \u00edt tr\u1edf ng\u1ea1i nh\u1ea5t.<\/li>\n
  • Kh\u1ea3 n\u0103ng ki\u1ec3m th\u1eed:<\/strong>Ch\u1ee9c n\u0103ng t\u00e1ch bi\u1ec7t d\u1ec5 ki\u1ec3m ch\u1ee9ng h\u01a1n b\u1eb1ng c\u00e1c b\u00e0i ki\u1ec3m th\u1eed \u0111\u01a1n v\u1ecb.<\/li>\n
  • Kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec:<\/strong>S\u1ef1 thay \u0111\u1ed5i \u1edf m\u1ed9t kh\u00eda c\u1ea1nh ch\u1ee9c n\u0103ng kh\u00f4ng lan truy\u1ec1n m\u1ed9t c\u00e1ch b\u1ea5t ng\u1edd qua c\u00e1c logic kh\u00f4ng li\u00ean quan.<\/li>\n<\/ul>\n

    Hi\u1ec3u v\u1ec1 s\u1ef1 li\u00ean k\u1ebft: K\u1ebft n\u1ed1i b\u00ean ngo\u00e0i \ud83d\udd17<\/h2>\n

    N\u1ebfu s\u1ef1 g\u1eafn k\u1ebft li\u00ean quan \u0111\u1ebfn s\u1ef1 th\u1ed1ng nh\u1ea5t b\u00ean trong, th\u00ec s\u1ef1 li\u00ean k\u1ebft l\u1ea1i li\u00ean quan \u0111\u1ebfn s\u1ef1 ph\u1ee5 thu\u1ed9c b\u00ean ngo\u00e0i. S\u1ef1 li\u00ean k\u1ebft \u0111o l\u01b0\u1eddng m\u1ee9c \u0111\u1ed9 ph\u1ee5 thu\u1ed9c l\u1eabn nhau gi\u1eefa c\u00e1c module ph\u1ea7n m\u1ec1m. Li\u00ean k\u1ebft th\u1ea5p c\u00f3 ngh\u0129a l\u00e0 c\u00e1c module \u0111\u1ed9c l\u1eadp v\u00e0 c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng m\u00e0 kh\u00f4ng c\u1ea7n bi\u1ebft chi ti\u1ebft n\u1ed9i b\u1ed9 c\u1ee7a nhau.<\/p>\n

    Li\u00ean k\u1ebft cao t\u1ea1o ra m\u1ed9t m\u1ea1ng l\u01b0\u1edbi ph\u1ee5 thu\u1ed9c. Vi\u1ec7c thay \u0111\u1ed5i m\u1ed9t module bu\u1ed9c ph\u1ea3i thay \u0111\u1ed5i nhi\u1ec1u module kh\u00e1c. \u0110i\u1ec1u n\u00e0y t\u1ea1o ra s\u1ef1 mong manh, n\u01a1i m\u1ed9t b\u1ea3n c\u1eadp nh\u1eadt \u0111\u01a1n gi\u1ea3n c\u00f3 th\u1ec3 l\u00e0m h\u1ecfng to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng.<\/p>\n

    C\u00e1c lo\u1ea1i li\u00ean k\u1ebft<\/h3>\n

    Gi\u1ed1ng nh\u01b0 s\u1ef1 g\u1eafn k\u1ebft, s\u1ef1 li\u00ean k\u1ebft n\u1eb1m tr\u00ean m\u1ed9t thang \u0111o. M\u1ee5c ti\u00eau l\u00e0 ti\u1ebfn t\u1edbi \u0111\u1ea7u th\u1ea5p h\u01a1n c\u1ee7a thang \u0111o n\u00e0y:<\/p>\n

      \n
    • Li\u00ean k\u1ebft n\u1ed9i dung (cao nh\u1ea5t):<\/strong>M\u1ed9t module thay \u0111\u1ed5i d\u1eef li\u1ec7u n\u1ed9i b\u1ed9 c\u1ee7a module kh\u00e1c. \u0110\u00e2y l\u00e0 h\u00ecnh th\u1ee9c li\u00ean k\u1ebft t\u1ec7 nh\u1ea5t.<\/li>\n
    • Li\u00ean k\u1ebft chung:<\/strong>C\u00e1c module chia s\u1ebb c\u1ea5u tr\u00fac d\u1eef li\u1ec7u to\u00e0n c\u1ee5c. Nh\u1eefng thay \u0111\u1ed5i v\u00e0o c\u1ea5u tr\u00fac to\u00e0n c\u1ee5c s\u1ebd \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ea5t c\u1ea3 ng\u01b0\u1eddi d\u00f9ng.<\/li>\n
    • Li\u00ean k\u1ebft \u0111i\u1ec1u khi\u1ec3n:<\/strong>M\u1ed9t module truy\u1ec1n m\u1ed9t c\u1edd \u0111i\u1ec1u khi\u1ec3n cho module kh\u00e1c, \u0111\u1ecbnh r\u00f5 lu\u1ed3ng logic n\u1ed9i b\u1ed9 c\u1ee7a n\u00f3.<\/li>\n
    • Li\u00ean k\u1ebft d\u1ea5u \u1ea5n:<\/strong>C\u00e1c module chia s\u1ebb m\u1ed9t c\u1ea5u tr\u00fac d\u1eef li\u1ec7u ph\u1ee9c t\u1ea1p (v\u00ed d\u1ee5: m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng) nh\u01b0ng ch\u1ec9 s\u1eed d\u1ee5ng m\u1ed9t v\u00e0i ph\u1ea7n c\u1ee7a n\u00f3.<\/li>\n
    • Li\u00ean k\u1ebft d\u1eef li\u1ec7u (th\u1ea5p nh\u1ea5t):<\/strong>C\u00e1c module ch\u1ec9 chia s\u1ebb d\u1eef li\u1ec7u c\u1ea7n thi\u1ebft cho ho\u1ea1t \u0111\u1ed9ng c\u1ee7a ch\u00fang. Ch\u00fang kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o c\u1edd \u0111i\u1ec1u khi\u1ec3n hay tr\u1ea1ng th\u00e1i to\u00e0n c\u1ee5c.<\/li>\n<\/ul>\n

      L\u1ee3i \u00edch c\u1ee7a s\u1ef1 li\u00ean k\u1ebft th\u1ea5p<\/h3>\n
        \n
      • T\u00ednh module:<\/strong>C\u00e1c module c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n, ki\u1ec3m th\u1eed v\u00e0 tri\u1ec3n khai \u0111\u1ed9c l\u1eadp.<\/li>\n
      • Ph\u00e1t tri\u1ec3n song song:<\/strong>C\u00e1c nh\u00f3m c\u00f3 th\u1ec3 l\u00e0m vi\u1ec7c tr\u00ean c\u00e1c module kh\u00e1c nhau m\u00e0 kh\u00f4ng l\u00e0m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn m\u00e3 ngu\u1ed3n c\u1ee7a nhau.<\/li>\n
      • T\u00ednh linh ho\u1ea1t:<\/strong>Vi\u1ec7c thay th\u1ebf m\u1ed9t module tr\u1edf n\u00ean d\u1ec5 d\u00e0ng h\u01a1n n\u1ebfu giao di\u1ec7n c\u1ee7a n\u00f3 duy tr\u00ec \u1ed5n \u0111\u1ecbnh.<\/li>\n
      • Kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng:<\/strong>C\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng m\u00e0 kh\u00f4ng tr\u1edf th\u00e0nh nh\u1eefng m\u1edb h\u1ed7n \u0111\u1ed9n kh\u00f3 ki\u1ec3m so\u00e1t v\u1ec1 c\u00e1c m\u1ed1i ph\u1ee5 thu\u1ed9c.<\/li>\n<\/ul>\n

        M\u1ed1i quan h\u1ec7 gi\u1eefa \u0111\u1ed9 g\u1eafn k\u1ebft v\u00e0 \u0111\u1ed9 li\u00ean k\u1ebft \ud83d\udd04<\/h2>\n

        C\u00f3 m\u1ed1i t\u01b0\u01a1ng quan tr\u1ef1c ti\u1ebfp gi\u1eefa hai kh\u00e1i ni\u1ec7m n\u00e0y. N\u00f3i chung, khi \u0111\u1ed9 g\u1eafn k\u1ebft t\u0103ng th\u00ec \u0111\u1ed9 li\u00ean k\u1ebft gi\u1ea3m. Khi m\u1ed9t module t\u1eadp trung v\u00e0o m\u1ed9t nhi\u1ec7m v\u1ee5 duy nh\u1ea5t (\u0111\u1ed9 g\u1eafn k\u1ebft cao), n\u00f3 c\u1ea7n \u00edt \u0111\u1ea7u v\u00e0o b\u00ean ngo\u00e0i h\u01a1n v\u00e0 t\u1ea1o ra \u00edt ph\u1ee5 thu\u1ed9c h\u01a1n (\u0111\u1ed9 li\u00ean k\u1ebft th\u1ea5p).<\/p>\n

        Ng\u01b0\u1ee3c l\u1ea1i, m\u1ed9t module c\u1ed1 g\u1eafng l\u00e0m m\u1ecdi th\u1ee9 (\u0111\u1ed9 g\u1eafn k\u1ebft th\u1ea5p) th\u01b0\u1eddng c\u1ea7n giao ti\u1ebfp v\u1edbi nhi\u1ec1u module kh\u00e1c \u0111\u1ec3 thu th\u1eadp d\u1eef li\u1ec7u ho\u1eb7c k\u00edch ho\u1ea1t c\u00e1c h\u00e0nh \u0111\u1ed9ng, d\u1eabn \u0111\u1ebfn \u0111\u1ed9 li\u00ean k\u1ebft cao.<\/p>\n

        C\u00e1c nh\u00e0 thi\u1ebft k\u1ebf n\u00ean h\u01b0\u1edbng \u0111\u1ebfn \u0111i\u1ec3m \u201c\u0111\u1ed9 g\u1eafn k\u1ebft cao, \u0111\u1ed9 li\u00ean k\u1ebft th\u1ea5p\u201d. S\u1ef1 k\u1ebft h\u1ee3p n\u00e0y t\u1ea1o ra m\u1ed9t h\u1ec7 th\u1ed1ng m\u00e0 c\u00e1c th\u00e0nh ph\u1ea7n t\u1ef1 ch\u1ee9a \u0111\u1ef1ng v\u00e0 ch\u1ec9 k\u1ebft n\u1ed1i v\u1edbi nhau th\u00f4ng qua c\u00e1c giao di\u1ec7n \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a r\u00f5 r\u00e0ng.<\/p>\n

        Chi\u1ebfn l\u01b0\u1ee3c c\u1ea3i thi\u1ec7n thi\u1ebft k\u1ebf \ud83d\udee0\ufe0f<\/h2>\n

        L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c s\u1ef1 c\u00e2n b\u1eb1ng n\u00e0y trong th\u1ef1c t\u1ebf? C\u00e1c chi\u1ebfn l\u01b0\u1ee3c sau \u0111\u00e2y h\u01b0\u1edbng d\u1eabn qu\u00e1 tr\u00ecnh thi\u1ebft k\u1ebf m\u00e0 kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c c\u00f4ng c\u1ee5 hay khung c\u00f4ng t\u00e1c c\u1ee5 th\u1ec3.<\/p>\n

        1. Nguy\u00ean t\u1eafc tr\u00e1ch nhi\u1ec7m duy nh\u1ea5t<\/h3>\n

        M\u1ed7i module n\u00ean ch\u1ec9 c\u00f3 m\u1ed9t l\u00fd do \u0111\u1ec3 thay \u0111\u1ed5i. N\u1ebfu m\u1ed9t l\u1edbp x\u1eed l\u00fd k\u1ebft n\u1ed1i c\u01a1 s\u1edf d\u1eef li\u1ec7u, x\u00e1c th\u1ef1c ng\u01b0\u1eddi d\u00f9ng v\u00e0 sinh b\u00e1o c\u00e1o, th\u00ec n\u00f3 vi ph\u1ea1m nguy\u00ean t\u1eafc n\u00e0y. H\u00e3y chia c\u00e1c v\u1ea5n \u0111\u1ec1 n\u00e0y th\u00e0nh c\u00e1c l\u1edbp ri\u00eang bi\u1ec7t. M\u1ed7i l\u1edbp t\u1eadp trung v\u00e0o m\u1ed9t tr\u00e1ch nhi\u1ec7m, t\u1ef1 nhi\u00ean l\u00e0m t\u0103ng \u0111\u1ed9 g\u1eafn k\u1ebft.<\/p>\n

        2. Bao \u0111\u00f3ng<\/h3>\n

        Che gi\u1ea5u tr\u1ea1ng th\u00e1i n\u1ed9i b\u1ed9 c\u1ee7a m\u1ed9t module. Ch\u1ec9 c\u00f4ng khai nh\u1eefng g\u00ec c\u1ea7n thi\u1ebft th\u00f4ng qua c\u00e1c giao di\u1ec7n c\u00f4ng khai. \u0110i\u1ec1u n\u00e0y ng\u0103n c\u00e1c module kh\u00e1c truy c\u1eadp v\u00e0 thay \u0111\u1ed5i d\u1eef li\u1ec7u n\u1ed9i b\u1ed9, gi\u1ea3m \u0111\u1ed9 li\u00ean k\u1ebft n\u1ed9i dung.<\/p>\n

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

        Kh\u00f4ng \u00e9p bu\u1ed9c kh\u00e1ch h\u00e0ng ph\u1ea3i ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c ph\u01b0\u01a1ng th\u1ee9c h\u1ecd kh\u00f4ng s\u1eed d\u1ee5ng. T\u1ea1o ra c\u00e1c giao di\u1ec7n nh\u1ecf, c\u1ee5 th\u1ec3 thay v\u00ec c\u00e1c giao di\u1ec7n l\u1edbn, \u0111\u01a1n th\u1ec3. \u0110i\u1ec1u n\u00e0y gi\u1ea3m \u0111\u1ed9 li\u00ean k\u1ebft d\u1ea5u \u1ea5n v\u00e0 \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c module ch\u1ec9 t\u01b0\u01a1ng t\u00e1c v\u1edbi d\u1eef li\u1ec7u m\u00e0 ch\u00fang c\u1ea7n.<\/p>\n

        4. Qu\u1ea3n l\u00fd ph\u1ee5 thu\u1ed9c<\/h3>\n

        S\u1eed d\u1ee5ng kh\u00e1i ni\u1ec7m ch\u00e8n ph\u1ee5 thu\u1ed9c \u0111\u1ec3 qu\u1ea3n l\u00fd c\u00e1c m\u1ed1i quan h\u1ec7. Thay v\u00ec c\u00e1c module t\u1ef1 t\u1ea1o ra c\u00e1c ph\u1ee5 thu\u1ed9c c\u1ee7a ch\u00fang, h\u00e3y cho ph\u00e9p ch\u00fang nh\u1eadn nh\u1eefng g\u00ec c\u1ea7n t\u1eeb b\u00ean ngo\u00e0i. \u0110i\u1ec1u n\u00e0y gi\u00fap d\u1ec5 d\u00e0ng thay th\u1ebf c\u00e1c tri\u1ec3n khai v\u00e0 ki\u1ec3m th\u1eed c\u00e1c th\u00e0nh ph\u1ea7n m\u1ed9t c\u00e1ch \u0111\u1ed9c l\u1eadp.<\/p>\n

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

        S\u1eed d\u1ee5ng c\u00e1c l\u1edbp tr\u1eebu t\u01b0\u1ee3ng ho\u1eb7c giao di\u1ec7n \u0111\u1ec3 \u0111\u1ecbnh ngh\u0129a h\u1ee3p \u0111\u1ed3ng. C\u00e1c tri\u1ec3n khai c\u1ee5 th\u1ec3 c\u00f3 th\u1ec3 thay \u0111\u1ed5i m\u00e0 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn m\u00e3 ngu\u1ed3n s\u1eed d\u1ee5ng ch\u00fang. \u0110i\u1ec1u n\u00e0y t\u00e1ch bi\u1ec7t logic kh\u1ecfi chi ti\u1ebft tri\u1ec3n khai c\u1ee5 th\u1ec3.<\/p>\n

        T\u00e1c \u0111\u1ed9ng \u0111\u1ebfn ki\u1ec3m th\u1eed v\u00e0 b\u1ea3o tr\u00ec \ud83e\uddea\ud83d\udcdd<\/h2>\n

        Ch\u1ea5t l\u01b0\u1ee3ng c\u1ea5u tr\u00fac v\u1ec1 \u0111\u1ed9 li\u00ean k\u1ebft v\u00e0 \u0111\u1ed9 g\u1eafn k\u1ebft \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn v\u00f2ng \u0111\u1eddi v\u1eadn h\u00e0nh c\u1ee7a ph\u1ea7n m\u1ec1m.<\/p>\n

        Hi\u1ec7u qu\u1ea3 ki\u1ec3m th\u1eed<\/h3>\n

        C\u00e1c module c\u00f3 \u0111\u1ed9 g\u1eafn k\u1ebft cao d\u1ec5 ki\u1ec3m th\u1eed h\u01a1n. B\u1ea1n c\u00f3 th\u1ec3 gi\u1ea3 l\u1eadp c\u00e1c ph\u1ee5 thu\u1ed9c v\u00e0 t\u1eadp trung v\u00e0o logic c\u1ee5 th\u1ec3 c\u1ee7a module \u0111\u00f3. \u0110\u1ed9 li\u00ean k\u1ebft th\u1ea5p \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c b\u00e0i ki\u1ec3m th\u1eed cho m\u1ed9t module kh\u00f4ng b\u1ecb h\u1ecfng khi module kh\u00e1c thay \u0111\u1ed5i. \u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn m\u1ed9t b\u1ed9 ki\u1ec3m th\u1eed \u1ed5n \u0111\u1ecbnh, mang l\u1ea1i s\u1ef1 t\u1ef1 tin trong qu\u00e1 tr\u00ecnh t\u00e1i c\u1ea5u tr\u00fac.<\/p>\n

        Chi ph\u00ed b\u1ea3o tr\u00ec<\/h3>\n

        B\u1ea3o tr\u00ec ph\u1ea7n m\u1ec1m th\u01b0\u1eddng l\u00e0 giai \u0111o\u1ea1n t\u1ed1n k\u00e9m nh\u1ea5t trong qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n. C\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 \u0111\u1ed9 g\u1eafn k\u1ebft th\u1ea5p v\u00e0 \u0111\u1ed9 li\u00ean k\u1ebft cao \u0111\u00f2i h\u1ecfi nhi\u1ec1u th\u1eddi gian h\u01a1n \u0111\u1ec3 hi\u1ec3u v\u00e0 s\u1eeda \u0111\u1ed5i. M\u1ed9t thay \u0111\u1ed5i \u1edf m\u1ed9t khu v\u1ef1c s\u1ebd lan truy\u1ec1n kh\u1eafp h\u1ec7 th\u1ed1ng, \u0111\u00f2i h\u1ecfi ki\u1ec3m th\u1eed h\u1ed3i quy k\u1ef9 l\u01b0\u1ee1ng. \u0110\u1ed9 g\u1eafn k\u1ebft cao v\u00e0 \u0111\u1ed9 li\u00ean k\u1ebft th\u1ea5p gi\u00fap gi\u1edbi h\u1ea1n c\u00e1c thay \u0111\u1ed5i, gi\u1ea3m b\u1edbt n\u1ed7 l\u1ef1c c\u1ea7n thi\u1ebft \u0111\u1ec3 s\u1eeda l\u1ed7i ho\u1eb7c th\u00eam t\u00ednh n\u0103ng.<\/p>\n

        K\u1ef9 thu\u1eadt t\u00e1i c\u1ea5u tr\u00fac<\/h3>\n

        Khi xem x\u00e9t m\u00e3 ngu\u1ed3n c\u0169, h\u00e3y t\u00ecm nh\u1eefng d\u1ea5u hi\u1ec7u c\u1ee7a \u0111\u1ed9 g\u1eafn k\u1ebft v\u00e0 \u0111\u1ed9 li\u00ean k\u1ebft k\u00e9m:<\/p>\n

          \n
        • L\u1edbp Th\u1ea7n:<\/strong>C\u00e1c l\u1edbp bi\u1ebft qu\u00e1 nhi\u1ec1u ho\u1eb7c l\u00e0m qu\u00e1 nhi\u1ec1u.<\/li>\n
        • Bi\u1ebfn to\u00e0n c\u1ee5c:<\/strong>Tr\u1ea1ng th\u00e1i \u0111\u01b0\u1ee3c chia s\u1ebb tr\u00ean to\u00e0n b\u1ed9 \u1ee9ng d\u1ee5ng.<\/li>\n
        • Danh s\u00e1ch tham s\u1ed1 d\u00e0i:<\/strong>C\u00e1c d\u1ea5u hi\u1ec7u c\u1ee7a s\u1ef1 li\u00ean k\u1ebft cao ho\u1eb7c bao \u0111\u00f3ng d\u1eef li\u1ec7u k\u00e9m.<\/li>\n
        • Logic b\u1ecb l\u1eb7p l\u1ea1i:<\/strong>M\u00e3 ngu\u1ed3n xu\u1ea5t hi\u1ec7n \u1edf nhi\u1ec1u n\u01a1i, cho th\u1ea5y nhu c\u1ea7u v\u1ec1 m\u1ed9t d\u1ecbch v\u1ee5 chung.<\/li>\n<\/ul>\n

          Vi\u1ec7c refactoring bao g\u1ed3m vi\u1ec7c di chuy\u1ec3n m\u00e3 \u0111\u1ec3 c\u1ea3i thi\u1ec7n t\u00ednh g\u1eafn k\u1ebft. V\u00ed d\u1ee5, n\u1ebfu m\u1ed9t ph\u01b0\u01a1ng th\u1ee9c ch\u1ec9 s\u1eed d\u1ee5ng m\u1ed9t n\u1eeda d\u1eef li\u1ec7u c\u1ee7a m\u1ed9t l\u1edbp, h\u00e3y di chuy\u1ec3n ph\u01b0\u01a1ng th\u1ee9c \u0111\u00f3 sang m\u1ed9t l\u1edbp m\u1edbi. N\u1ebfu m\u1ed9t l\u1edbp ph\u1ee5 thu\u1ed9c v\u00e0o l\u1edbp kh\u00e1c \u0111\u1ec3 c\u1ea5u h\u00ecnh, h\u00e3y gi\u1edbi thi\u1ec7u m\u1ed9t factory ho\u1eb7c injector.<\/p>\n

          Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u1ea7n tr\u00e1nh \u26a0\ufe0f<\/h2>\n

          Trong khi nh\u1eafm \u0111\u1ebfn t\u00ednh g\u1eafn k\u1ebft cao v\u00e0 li\u00ean k\u1ebft th\u1ea5p, \u0111i\u1ec1u quan tr\u1ecdng l\u00e0 tr\u00e1nh nh\u1eefng c\u1ef1c \u0111oan c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t ho\u1eb7c kh\u1ea3 n\u0103ng s\u1eed d\u1ee5ng.<\/p>\n

            \n
          • Qu\u00e1 m\u1ee9c tr\u1eebu t\u01b0\u1ee3ng:<\/strong>T\u1ea1o qu\u00e1 nhi\u1ec1u giao di\u1ec7n c\u00f3 th\u1ec3 khi\u1ebfn m\u00e3 ngu\u1ed3n kh\u00f3 thao t\u00e1c h\u01a1n. Gi\u1eef c\u00e1c tr\u1eebu t\u01b0\u1ee3ng \u0111\u01a1n gi\u1ea3n v\u00e0 c\u00f3 \u00fd ngh\u0129a.<\/li>\n
          • T\u1ed1i \u01b0u h\u00f3a vi m\u00f4:<\/strong>\u0110\u1eebng t\u00e1ch l\u1edbp ch\u1ec9 \u0111\u1ec3 gi\u1ea3m li\u00ean k\u1ebft n\u1ebfu l\u1ee3i \u00edch v\u1ec1 hi\u1ec7u su\u1ea5t l\u00e0 kh\u00f4ng \u0111\u00e1ng k\u1ec3. D\u1ec5 b\u1ea3o tr\u00ec quan tr\u1ecdng h\u01a1n nh\u1eefng c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t nh\u1ecf.<\/li>\n
          • Giao di\u1ec7n c\u1ee9ng nh\u1eafc:<\/strong>\u0110\u1ea3m b\u1ea3o c\u00e1c giao di\u1ec7n v\u1eabn linh ho\u1ea1t \u0111\u1ee7 \u0111\u1ec3 ch\u1ea5p nh\u1eadn nh\u1eefng thay \u0111\u1ed5i trong t\u01b0\u01a1ng lai m\u00e0 kh\u00f4ng l\u00e0m h\u1ecfng c\u00e1c tri\u1ec3n khai hi\u1ec7n t\u1ea1i.<\/li>\n
          • B\u1ecf qua logic kinh doanh:<\/strong>\u0110\u1eebng thi\u1ebft k\u1ebf ch\u1ec9 v\u00ec t\u00ednh thu\u1ea7n khi\u1ebft v\u1ec1 k\u1ef9 thu\u1eadt. C\u1ea5u tr\u00fac ph\u1ea3i h\u1ed7 tr\u1ee3 hi\u1ec7u qu\u1ea3 c\u00e1c y\u00eau c\u1ea7u kinh doanh.<\/li>\n<\/ul>\n

            K\u1ebft lu\u1eadn v\u1ec1 ch\u1ea5t l\u01b0\u1ee3ng thi\u1ebft k\u1ebf \ud83c\udfc1<\/h2>\n

            Qu\u1ea3n l\u00fd li\u00ean k\u1ebft v\u00e0 g\u1eafn k\u1ebft l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh li\u00ean t\u1ee5c, kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t nhi\u1ec7m v\u1ee5 m\u1ed9t l\u1ea7n. N\u00f3 \u0111\u00f2i h\u1ecfi s\u1ef1 c\u1ea3nh gi\u00e1c trong qu\u00e1 tr\u00ecnh xem x\u00e9t m\u00e3 ngu\u1ed3n, c\u00e1c bu\u1ed5i refactoring v\u00e0 l\u1eadp k\u1ebf ho\u1ea1ch ki\u1ebfn tr\u00fac. B\u1eb1ng c\u00e1ch \u01b0u ti\u00ean c\u00e1c nguy\u00ean t\u1eafc 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 l\u1ea1i s\u1ef1 thay \u0111\u1ed5i.<\/p>\n

            M\u1ee5c ti\u00eau kh\u00f4ng ph\u1ea3i l\u00e0 s\u1ef1 ho\u00e0n h\u1ea3o, m\u00e0 l\u00e0 ti\u1ebfn b\u1ed9. \u0110\u00e1nh gi\u00e1 th\u01b0\u1eddng xuy\u00ean c\u00e1c module c\u1ee7a b\u1ea1n. H\u1ecfi xem m\u1ed9t l\u1edbp c\u00f3 qu\u00e1 nhi\u1ec1u tr\u00e1ch nhi\u1ec7m hay kh\u00f4ng. H\u1ecfi xem m\u1ed9t ph\u1ee5 thu\u1ed9c c\u00f3 th\u1ef1c s\u1ef1 c\u1ea7n thi\u1ebft hay kh\u00f4ng. Nh\u1eefng \u0111i\u1ec1u ch\u1ec9nh nh\u1ecf theo th\u1eddi gian s\u1ebd d\u1eabn \u0111\u1ebfn m\u1ed9t ki\u1ebfn tr\u00fac v\u1eefng ch\u1eafc.<\/p>\n

            H\u00e3y nh\u1edb r\u1eb1ng nh\u1eefng nguy\u00ean t\u1eafc n\u00e0y l\u00e0 h\u01b0\u1edbng d\u1eabn, ch\u1ee9 kh\u00f4ng ph\u1ea3i lu\u1eadt c\u1ee9ng nh\u1eafc. S\u1eed d\u1ee5ng s\u1ef1 ph\u00e1n \u0111o\u00e1n c\u1ee7a b\u1ea1n \u0111\u1ec3 \u00e1p d\u1ee5ng ch\u00fang \u1edf nh\u1eefng n\u01a1i ch\u00fang mang l\u1ea1i gi\u00e1 tr\u1ecb. V\u1edbi s\u1ef1 t\u1eadp trung v\u00e0o tr\u00e1ch nhi\u1ec7m r\u00f5 r\u00e0ng v\u00e0 c\u00e1c ph\u1ee5 thu\u1ed9c t\u1ed1i thi\u1ec3u, b\u1ea1n s\u1ebd x\u00e2y d\u1ef1ng ph\u1ea7n m\u1ec1m v\u01b0\u1ee3t qua th\u1eed th\u00e1ch c\u1ee7a th\u1eddi gian.<\/p>\n","protected":false},"excerpt":{"rendered":"

            Trong b\u1ed1i c\u1ea3nh Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng, hai ch\u1ec9 s\u1ed1 \u0111\u1ecbnh ngh\u0129a s\u1ee9c kh\u1ecfe c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng: s\u1ef1 li\u00ean k\u1ebft v\u00e0 t\u00ednh g\u1eafn k\u1ebft. Nh\u1eefng…<\/p>\n","protected":false},"author":1,"featured_media":1861,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"Qu\u1ea3n l\u00fd li\u00ean k\u1ebft & g\u1eafn k\u1ebft trong OOAD \ud83d\udee0\ufe0f\ud83e\udde9","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1ch qu\u1ea3n l\u00fd li\u00ean k\u1ebft v\u00e0 g\u1eafn k\u1ebft hi\u1ec7u qu\u1ea3 trong Ph\u00e2n t\u00edch v\u00e0 Thi\u1ebft k\u1ebf H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. 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