{"id":618,"date":"2026-04-02T06:15:11","date_gmt":"2026-04-02T06:15:11","guid":{"rendered":"https:\/\/www.viz-tools.com\/vi\/uml-activity-diagrams-decision-nodes-branching-guide\/"},"modified":"2026-04-02T06:15:11","modified_gmt":"2026-04-02T06:15:11","slug":"uml-activity-diagrams-decision-nodes-branching-guide","status":"publish","type":"post","link":"https:\/\/www.viz-tools.com\/vi\/uml-activity-diagrams-decision-nodes-branching-guide\/","title":{"rendered":"Kh\u00e1m ph\u00e1 s\u00e2u v\u1ec1 s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng UML: N\u1eafm v\u1eefng c\u00e1c n\u00fat quy\u1ebft \u0111\u1ecbnh v\u00e0 nh\u00e1nh"},"content":{"rendered":"

S\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng \u0111\u00f3ng vai tr\u00f2 n\u1ec1n t\u1ea3ng \u0111\u1ec3 tr\u1ef1c quan h\u00f3a c\u00e1c kh\u00eda c\u1ea1nh \u0111\u1ed9ng c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng. Trong khi s\u01a1 \u0111\u1ed3 l\u01b0u \u0111\u1ed3 v\u00e0 m\u00e1y tr\u1ea1ng th\u00e1i cung c\u1ea5p c\u00e1i nh\u00ecn v\u1ec1 h\u00e0nh vi, s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng \u0111\u1eb7c bi\u1ec7t t\u1eadp trung v\u00e0o lu\u1ed3ng \u0111i\u1ec1u khi\u1ec3n v\u00e0 d\u1eef li\u1ec7u. \u1ede trung t\u00e2m c\u1ee7a lu\u1ed3ng n\u00e0y l\u00e0 n\u00fat quy\u1ebft \u0111\u1ecbnh. Vi\u1ec7c hi\u1ec3u r\u00f5 c\u00e1ch \u0111i\u1ec1u khi\u1ec3n ph\u00e2n nh\u00e1nh qua h\u1ec7 th\u1ed1ng l\u00e0 y\u1ebfu t\u1ed1 then ch\u1ed1t cho vi\u1ec7c m\u00f4 h\u00ecnh h\u00f3a ch\u00ednh x\u00e1c. H\u01b0\u1edbng d\u1eabn n\u00e0y kh\u00e1m ph\u00e1 c\u01a1 ch\u1ebf c\u1ee7a c\u00e1c n\u00fat quy\u1ebft \u0111\u1ecbnh, c\u00fa ph\u00e1p c\u1ee7a nh\u00e1nh, v\u00e0 nh\u1eefng tinh t\u1ebf c\u1ee7a \u0111i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7.<\/p>\n

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\"Hand-drawn<\/figure>\n<\/div>\n

\ud83d\udd0d N\u00fat quy\u1ebft \u0111\u1ecbnh l\u00e0 g\u00ec?<\/h2>\n

M\u1ed9t n\u00fat quy\u1ebft \u0111\u1ecbnh \u0111\u1ea1i di\u1ec7n cho m\u1ed9t \u0111i\u1ec3m trong ho\u1ea1t \u0111\u1ed9ng n\u01a1i lu\u1ed3ng \u0111i\u1ec1u khi\u1ec3n t\u00e1ch ra. N\u00f3 \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n tr\u1ef1c quan d\u01b0\u1edbi d\u1ea1ng h\u00ecnh thoi \u0111\u1eb7c. K\u00fd hi\u1ec7u n\u00e0y cho th\u1ea5y qu\u00e1 tr\u00ecnh ph\u1ea3i ch\u1ecdn m\u1ed9t \u0111\u01b0\u1eddng \u0111i duy nh\u1ea5t t\u1eeb nhi\u1ec1u l\u1ef1a ch\u1ecdn kh\u1ea3 d\u1ee5ng d\u1ef1a tr\u00ean c\u00e1c ti\u00eau ch\u00ed c\u1ee5 th\u1ec3. Kh\u00e1c v\u1edbi n\u00fat h\u1ee3p nh\u1ea5t, v\u1ed1n k\u1ebft h\u1ee3p c\u00e1c lu\u1ed3ng, n\u00fat quy\u1ebft \u0111\u1ecbnh l\u1ea1i chia t\u00e1ch ch\u00fang.<\/p>\n

M\u1ed7i n\u00fat quy\u1ebft \u0111\u1ecbnh \u0111\u1ec1u y\u00eau c\u1ea7u \u00edt nh\u1ea5t m\u1ed9t lu\u1ed3ng \u0111\u1ea7u v\u00e0o v\u00e0 hai ho\u1eb7c nhi\u1ec1u lu\u1ed3ng \u0111\u1ea7u ra. Vi\u1ec7c l\u1ef1a ch\u1ecdn \u0111\u01b0\u1eddng \u0111i \u0111\u1ea7u ra \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng c\u00e1ch \u0111\u00e1nh gi\u00e1 c\u00e1c \u0111i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7 \u0111\u01b0\u1ee3c g\u1eafn v\u00e0o c\u00e1c c\u1ea1nh \u0111\u1ea7u ra. N\u1ebfu kh\u00f4ng c\u00f3 \u0111i\u1ec1u ki\u1ec7n n\u00e0o \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh, lu\u1ed3ng \u0111\u01b0\u1ee3c gi\u1ea3 \u0111\u1ecbnh l\u00e0 kh\u00f4ng \u0111i\u1ec1u ki\u1ec7n, m\u1eb7c d\u00f9 \u0111i\u1ec1u n\u00e0y hi\u1ebfm khi x\u1ea3y ra trong m\u00f4 h\u00ecnh h\u00f3a ph\u1ee9c t\u1ea1p.<\/p>\n

    \n
  • Lu\u1ed3ng \u0111\u1ea7u v\u00e0o:<\/strong> M\u0169i t\u00ean duy nh\u1ea5t \u0111i v\u00e0o h\u00ecnh thoi.<\/li>\n
  • C\u00e1c lu\u1ed3ng \u0111\u1ea7u ra:<\/strong> Nhi\u1ec1u m\u0169i t\u00ean tho\u00e1t ra kh\u1ecfi h\u00ecnh thoi.<\/li>\n
  • C\u01a1 ch\u1ebf l\u1ef1a ch\u1ecdn:<\/strong> Logic \u0111\u00e1nh gi\u00e1 c\u00e1c \u0111i\u1ec1u ki\u1ec7n \u0111\u1ec3 ch\u1ecdn m\u1ed9t \u0111\u01b0\u1eddng \u0111i.<\/li>\n
  • \u0110\u1ed9ng t\u00e1c song song:<\/strong> M\u1ed9t n\u00fat quy\u1ebft \u0111\u1ecbnh duy nh\u1ea5t kh\u00f4ng t\u1ea1o ra c\u00e1c lu\u1ed3ng song song; n\u00f3 ch\u1ec9 ch\u1ecdn m\u1ed9t.<\/li>\n<\/ul>\n

    R\u1ea5t quan tr\u1ecdng khi ph\u00e2n bi\u1ec7t gi\u1eefa lu\u1ed3ng \u0111i\u1ec1u khi\u1ec3n v\u00e0 lu\u1ed3ng \u0111\u1ed1i t\u01b0\u1ee3ng. M\u1ed9t n\u00fat quy\u1ebft \u0111\u1ecbnh ho\u1ea1t \u0111\u1ed9ng tr\u00ean lu\u1ed3ng \u0111i\u1ec1u khi\u1ec3n. N\u00f3 quy\u1ebft \u0111\u1ecbnh xem m\u1ed9t ho\u1ea1t \u0111\u1ed9ng c\u00f3 n\u00ean ti\u1ebfp t\u1ee5c hay ho\u1ea1t \u0111\u1ed9ng n\u00e0o n\u00ean \u0111\u01b0\u1ee3c th\u1ef1c thi ti\u1ebfp theo. N\u00f3 kh\u00f4ng thao t\u00e1c tr\u1ef1c ti\u1ebfp v\u1edbi c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng d\u1eef li\u1ec7u, m\u1eb7c d\u00f9 d\u1eef li\u1ec7u c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn logic quy\u1ebft \u0111\u1ecbnh.<\/p>\n

    \ud83d\udee1\ufe0f Hi\u1ec3u v\u1ec1 \u0111i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7<\/h2>\n

    C\u00e1c \u0111i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7 l\u00e0 nh\u1eefng bi\u1ec3u th\u1ee9c logic x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1eddng \u0111i n\u00e0o s\u1ebd \u0111\u01b0\u1ee3c ch\u1ecdn. Ch\u00fang xu\u1ea5t hi\u1ec7n tr\u00ean c\u00e1c c\u1ea1nh \u0111\u1ea7u ra c\u1ee7a n\u00fat quy\u1ebft \u0111\u1ecbnh. Nh\u1eefng \u0111i\u1ec1u ki\u1ec7n n\u00e0y ph\u1ea3i \u0111\u01b0\u1ee3c vi\u1ebft theo c\u00e1ch r\u00f5 r\u00e0ng v\u00e0 kh\u00f4ng m\u01a1 h\u1ed3 \u0111\u1ec3 b\u1ea5t k\u1ef3 ai xem s\u01a1 \u0111\u1ed3 \u0111\u1ec1u c\u00f3 th\u1ec3 hi\u1ec3u.<\/p>\n

    C\u00e1c \u0111i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7 th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111\u00f3ng trong d\u1ea5u ngo\u1eb7c vu\u00f4ng. V\u00ed d\u1ee5, [status == 'approved']<\/code> cho th\u1ea5y lu\u1ed3ng ch\u1ec9 ti\u1ebfp t\u1ee5c n\u1ebfu tr\u1ea1ng th\u00e1i \u0111\u01b0\u1ee3c ph\u00ea duy\u1ec7t. N\u1ebfu \u0111i\u1ec1u ki\u1ec7n \u0111\u00e1nh gi\u00e1 l\u00e0 sai, \u0111\u01b0\u1eddng \u0111i \u0111\u00f3 s\u1ebd kh\u00f4ng \u0111\u01b0\u1ee3c ch\u1ecdn. H\u1ec7 th\u1ed1ng s\u1ebd t\u00ecm ki\u1ebfm \u0111i\u1ec1u ki\u1ec7n \u0111\u1ea7u ti\u00ean \u0111\u00e1nh gi\u00e1 l\u00e0 \u0111\u00fang.<\/p>\n

    \u0110\u1eb7c \u0111i\u1ec3m ch\u00ednh c\u1ee7a \u0111i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7<\/h3>\n
      \n
    • Logic nh\u1ecb ph\u00e2n:<\/strong> C\u00e1c \u0111i\u1ec1u ki\u1ec7n th\u01b0\u1eddng d\u1eabn \u0111\u1ebfn k\u1ebft qu\u1ea3 \u0111\u00fang ho\u1eb7c sai.<\/li>\n
    • T\u00ednh lo\u1ea1i tr\u1eeb:<\/strong> Trong m\u1ed9t n\u00fat quy\u1ebft \u0111\u1ecbnh ti\u00eau chu\u1ea9n, ch\u1ec9 c\u00f3 m\u1ed9t \u0111\u01b0\u1eddng \u0111i \u0111\u01b0\u1ee3c ch\u1ecdn trong m\u1ed7i l\u1ea7n th\u1ef1c thi.<\/li>\n
    • T\u00ednh \u0111\u1ea7y \u0111\u1ee7:<\/strong> V\u1ec1 l\u00fd t\u01b0\u1edfng, c\u00e1c \u0111i\u1ec1u ki\u1ec7n c\u1ea7n bao qu\u00e1t t\u1ea5t c\u1ea3 c\u00e1c t\u00ecnh hu\u1ed1ng kh\u1ea3 thi \u0111\u1ec3 ng\u0103n ch\u1eb7n c\u00e1c t\u00ecnh tr\u1ea1ng k\u1eb9t.<\/li>\n
    • T\u00ednh d\u1ec5 \u0111\u1ecdc:<\/strong> Tr\u00e1nh s\u1eed d\u1ee5ng logic nh\u1ecb ph\u00e2n qu\u00e1 ph\u1ee9c t\u1ea1p l\u00e0m m\u1edd m\u1ee5c \u0111\u00edch.<\/li>\n<\/ul>\n

      Khi m\u00f4 h\u00ecnh h\u00f3a c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p, c\u00e1c \u0111i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7 th\u01b0\u1eddng tham chi\u1ebfu \u0111\u1ebfn thu\u1ed9c t\u00ednh \u0111\u1ed1i t\u01b0\u1ee3ng ho\u1eb7c bi\u1ebfn h\u1ec7 th\u1ed1ng. V\u00ed d\u1ee5, m\u1ed9t quy tr\u00ecnh kho h\u00e0ng c\u00f3 th\u1ec3 ki\u1ec3m tra [inventory_level > 10]<\/code> \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh xem m\u1ed9t l\u00f4 h\u00e0ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c g\u1eedi \u0111i hay kh\u00f4ng.<\/p>\n

      V\u00ed d\u1ee5 v\u1ec1 \u0111i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7<\/h3>\n\n\n\n\n\n\n\n\n
      Ng\u1eef ph\u00e1p \u0111i\u1ec1u ki\u1ec7n<\/th>\n\u00dd ngh\u0129a<\/th>\nB\u1ed1i c\u1ea3nh v\u00ed d\u1ee5<\/th>\n<\/tr>\n<\/thead>\n
      [s\u1ed1 l\u01b0\u1ee3ng > 1000]<\/code><\/td>\nS\u1ed1 l\u01b0\u1ee3ng v\u01b0\u1ee3t ng\u01b0\u1ee1ng<\/td>\nPh\u00ea duy\u1ec7t cho c\u00e1c giao d\u1ecbch l\u1edbn<\/td>\n<\/tr>\n
      [vai tr\u00f2Ng\u01b0\u1eddiD\u00f9ng == 'admin']<\/code><\/td>\nNg\u01b0\u1eddi d\u00f9ng c\u00f3 vai tr\u00f2 c\u1ee5 th\u1ec3<\/td>\nQuy\u1ec1n ki\u1ec3m so\u00e1t truy c\u1eadp<\/td>\n<\/tr>\n
      [tr\u1ea1ng_th\u00e1i == '\u0111ang_ch\u1edd']<\/code><\/td>\nM\u1ee5c \u0111ang ch\u1edd<\/td>\n\u0110\u1ecbnh tuy\u1ebfn quy tr\u00ecnh l\u00e0m vi\u1ec7c<\/td>\n<\/tr>\n
      [!kh\u00f4ng_r\u1ed7ng]<\/code><\/td>\nGi\u00e1 tr\u1ecb kh\u00f4ng r\u1ed7ng<\/td>\nX\u00e1c th\u1ef1c bi\u1ec3u m\u1eabu<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      \ud83e\udded Ng\u1eef ph\u00e1p c\u1ee7a nh\u00e1nh<\/h2>\n

      Nh\u00e1nh \u0111\u1ec1 c\u1eadp \u0111\u1ebfn c\u00e1ch b\u1ed1 tr\u00ed c\u1ea5u tr\u00fac c\u1ee7a c\u00e1c \u0111\u01b0\u1eddng \u0111i xu\u1ea5t ph\u00e1t t\u1eeb m\u1ed9t \u0111i\u1ec3m quy\u1ebft \u0111\u1ecbnh. K\u00fd hi\u1ec7u UML ti\u00eau chu\u1ea9n s\u1eed d\u1ee5ng n\u00fat quy\u1ebft \u0111\u1ecbnh cho nh\u00e1nh lo\u1ea1i lo\u1ea1i tr\u1eeb. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 ch\u1ec9 c\u00f3 m\u1ed9t \u0111\u01b0\u1eddng \u0111i \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m.<\/p>\n

      Khi v\u1ebd c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y, c\u1ea7n ch\u00fa \u00fd \u0111\u1ebfn vi\u1ec7c g\u00e1n nh\u00e3n cho c\u00e1c lu\u1ed3ng. M\u1ed7i c\u1ea1nh ra ph\u1ea3i c\u00f3 nh\u00e3n ch\u1ec9 r\u00f5 \u0111i\u1ec1u ki\u1ec7n. N\u1ebfu \u0111i\u1ec1u ki\u1ec7n l\u00e0 sai, nh\u00e3n s\u1ebd b\u1ecb b\u1ecf qua m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3.<\/p>\n

      Nh\u00e1nh lo\u1ea1i tr\u1eeb so v\u1edbi nh\u00e1nh bao g\u1ed3m<\/h3>\n

      C\u00e1c n\u00fat quy\u1ebft \u0111\u1ecbnh ti\u00eau chu\u1ea9n ng\u1ee5 \u00fd nh\u00e1nh lo\u1ea1i tr\u1eeb. Tuy nhi\u00ean, trong m\u1ed9t s\u1ed1 t\u00ecnh hu\u1ed1ng m\u00f4 h\u00ecnh h\u00f3a, nhi\u1ec1u \u0111i\u1ec1u ki\u1ec7n c\u00f3 th\u1ec3 \u0111\u00fang \u0111\u1ed3ng th\u1eddi. Trong UML, \u0111i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c x\u1eed l\u00fd th\u00f4ng qua n\u00fat h\u1ee3p nh\u1ea5t sau n\u00e0y, nh\u01b0ng b\u1ea3n th\u00e2n quy\u1ebft \u0111\u1ecbnh v\u1eabn l\u00e0 lo\u1ea1i tr\u1eeb tr\u1eeb khi c\u00f3 ch\u1ec9 \u0111\u1ecbnh kh\u00e1c. \u0110\u1ec3 m\u00f4 h\u00ecnh h\u00f3a nh\u00e1nh bao g\u1ed3m n\u01a1i nhi\u1ec1u \u0111\u01b0\u1eddng \u0111i \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t, ng\u01b0\u1eddi ta th\u01b0\u1eddng s\u1eed d\u1ee5ng n\u00fat chia nh\u00e1nh theo sau l\u00e0 n\u00fat quy\u1ebft \u0111\u1ecbnh, ho\u1eb7c \u0111\u01a1n gi\u1ea3n l\u00e0 \u0111\u1ea3m b\u1ea3o logic x\u1eed l\u00fd vi\u1ec7c th\u1ef1c thi song song.<\/p>\n

      V\u00ec m\u1ee5c \u0111\u00edch c\u1ee7a c\u00e1c s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng ti\u00eau chu\u1ea9n, ch\u00fang ta gi\u1ea3 \u0111\u1ecbnh nh\u00e1nh lo\u1ea1i tr\u1eeb tr\u1eeb khi n\u00fat chia nh\u00e1nh \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u00f5 r\u00e0ng. S\u1ef1 ph\u00e2n bi\u1ec7t n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 duy tr\u00ec c\u00e1c m\u00f4 h\u00ecnh hi\u1ec7u su\u1ea5t v\u00e0 \u0111\u1ed3ng th\u1eddi ch\u00ednh x\u00e1c.<\/p>\n

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      • Nh\u00e1nh lo\u1ea1i tr\u1eeb:<\/strong> Ch\u1ec9 c\u00f3 m\u1ed9t \u0111\u01b0\u1eddng \u0111i. C\u1ea5u tr\u00fac if-else<\/code> c\u1ea5u tr\u00fac.<\/li>\n
      • Lu\u1ed3ng song song:<\/strong> Nhi\u1ec1u \u0111\u01b0\u1eddng \u0111i \u0111\u1ed3ng th\u1eddi. C\u1ea5u tr\u00fac fork<\/code> c\u1ea5u tr\u00fac.<\/li>\n
      • K\u1ebft h\u1ee3p:<\/strong>S\u1eed d\u1ee5ng m\u1ed9t n\u00fat quy\u1ebft \u0111\u1ecbnh \u0111\u1ec3 \u0111\u1ecbnh tuy\u1ebfn, sau \u0111\u00f3 d\u00f9ng n\u00fat chia \u0111\u1ec3 song song h\u00f3a.<\/li>\n<\/ul>\n

        \ud83d\udd04 N\u00fat quy\u1ebft \u0111\u1ecbnh so v\u1edbi n\u00fat h\u1ee3p nh\u1ea5t<\/h2>\n

        Hai n\u00fat n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng theo c\u1eb7p. N\u00fat quy\u1ebft \u0111\u1ecbnh chia lu\u1ed3ng, c\u00f2n n\u00fat h\u1ee3p nh\u1ea5t k\u1ebft h\u1ee3p l\u1ea1i. S\u1ef1 nh\u1ea7m l\u1eabn gi\u1eefa ch\u00fang c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn sai s\u00f3t m\u00f4 h\u00ecnh nghi\u00eam tr\u1ecdng.<\/p>\n

          \n
        • N\u00fat quy\u1ebft \u0111\u1ecbnh (H\u00ecnh thoi):<\/strong>Chia m\u1ed9t lu\u1ed3ng th\u00e0nh nhi\u1ec1u lu\u1ed3ng. Logic s\u1ebd x\u00e1c \u0111\u1ecbnh h\u01b0\u1edbng \u0111i.<\/li>\n
        • N\u00fat h\u1ee3p nh\u1ea5t (H\u00ecnh thoi):<\/strong>K\u1ebft h\u1ee3p nhi\u1ec1u lu\u1ed3ng th\u00e0nh m\u1ed9t lu\u1ed3ng. Kh\u00f4ng c\u00f3 logic n\u00e0o \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng \u1edf \u0111\u00e2y.<\/li>\n<\/ul>\n

          N\u00fat h\u1ee3p nh\u1ea5t kh\u00f4ng \u0111\u00e1nh gi\u00e1 \u0111i\u1ec1u ki\u1ec7n. N\u00f3 ch\u1ec9 \u0111\u01a1n gi\u1ea3n ch\u1edd b\u1ea5t k\u1ef3 lu\u1ed3ng n\u00e0o \u0111\u1ebfn v\u00e0 chuy\u1ec3n quy\u1ec1n \u0111i\u1ec1u khi\u1ec3n ti\u1ebfp t\u1ee5c. Logic ho\u00e0n to\u00e0n n\u1eb1m \u1edf \u0111i\u1ec3m quy\u1ebft \u0111\u1ecbnh.<\/p>\n\n\n\n\n\n\n\n\n\n
          T\u00ednh n\u0103ng<\/th>\nN\u00fat quy\u1ebft \u0111\u1ecbnh<\/th>\nN\u00fat h\u1ee3p nh\u1ea5t<\/th>\n<\/tr>\n<\/thead>\n
          H\u00ecnh d\u1ea1ng<\/td>\nH\u00ecnh thoi \u0111en<\/td>\nH\u00ecnh thoi tr\u1eafng<\/td>\n<\/tr>\n
          Lu\u1ed3ng \u0111\u1ea7u v\u00e0o<\/td>\n1 (ho\u1eb7c nhi\u1ec1u h\u01a1n trong c\u00e1c tr\u01b0\u1eddng h\u1ee3p ph\u1ee9c t\u1ea1p)<\/td>\n1 ho\u1eb7c nhi\u1ec1u h\u01a1n<\/td>\n<\/tr>\n
          Lu\u1ed3ng \u0111\u1ea7u ra<\/td>\n2 ho\u1eb7c nhi\u1ec1u h\u01a1n<\/td>\n1<\/td>\n<\/tr>\n
          Ch\u1ee9c n\u0103ng<\/td>\n\u0110\u1ecbnh tuy\u1ebfn d\u1ef1a tr\u00ean \u0111i\u1ec1u ki\u1ec7n<\/td>\nK\u1ebft h\u1ee3p c\u00e1c tuy\u1ebfn \u0111\u01b0\u1eddng<\/td>\n<\/tr>\n
          Logic<\/td>\nC\u00f3<\/td>\nKh\u00f4ng<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          \ud83d\udccb C\u00e1c m\u1eabu ph\u1ed5 bi\u1ebfn v\u00e0 v\u00ed d\u1ee5<\/h2>\n

          \u00c1p d\u1ee5ng c\u00e1c kh\u00e1i ni\u1ec7m n\u00e0y \u0111\u00f2i h\u1ecfi c\u00e1c v\u00ed d\u1ee5 th\u1ef1c t\u1ebf. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c t\u00ecnh hu\u1ed1ng ph\u1ed5 bi\u1ebfn n\u01a1i n\u00fat quy\u1ebft \u0111\u1ecbnh l\u00e0 thi\u1ebft y\u1ebfu cho vi\u1ec7c m\u00f4 h\u00ecnh h\u00f3a.<\/p>\n

          1. Lu\u1ed3ng X\u00e1c th\u1ef1c Ng\u01b0\u1eddi d\u00f9ng<\/h3>\n

          X\u00e9t m\u1ed9t qu\u00e1 tr\u00ecnh \u0111\u0103ng nh\u1eadp. Sau khi th\u00f4ng tin \u0111\u0103ng nh\u1eadp \u0111\u01b0\u1ee3c nh\u1eadp, h\u1ec7 th\u1ed1ng ph\u1ea3i x\u00e1c minh ch\u00fang. M\u1ed9t n\u00fat quy\u1ebft \u0111\u1ecbnh ki\u1ec3m tra t\u00ednh h\u1ee3p l\u1ec7 c\u1ee7a t\u00ean ng\u01b0\u1eddi d\u00f9ng v\u00e0 m\u1eadt kh\u1ea9u.<\/p>\n

            \n
          • \u0110\u1ea7u v\u00e0o:<\/strong>Ng\u01b0\u1eddi d\u00f9ng g\u1eedi bi\u1ec3u m\u1eabu \u0111\u0103ng nh\u1eadp.<\/li>\n
          • Quy\u1ebft \u0111\u1ecbnh:<\/strong>Th\u00f4ng tin \u0111\u0103ng nh\u1eadp c\u00f3 h\u1ee3p l\u1ec7 kh\u00f4ng?<\/li>\n
          • \u0110\u01b0\u1eddng d\u1eabn A (\u0110\u00fang):<\/strong>Chuy\u1ec3n h\u01b0\u1edbng \u0111\u1ebfn b\u1ea3ng \u0111i\u1ec1u khi\u1ec3n.<\/li>\n
          • \u0110\u01b0\u1eddng d\u1eabn B (Sai):<\/strong>Hi\u1ec3n th\u1ecb th\u00f4ng b\u00e1o l\u1ed7i.<\/li>\n<\/ul>\n

            Vi\u1ec7c nh\u00e1nh \u0111\u01a1n gi\u1ea3n n\u00e0y \u0111\u1ea3m b\u1ea3o ng\u01b0\u1eddi d\u00f9ng kh\u00f4ng th\u1ec3 truy c\u1eadp c\u00e1c khu v\u1ef1c \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 m\u00e0 kh\u00f4ng c\u00f3 x\u00e1c th\u1ef1c h\u1ee3p l\u1ec7.<\/p>\n

            2. H\u1ec7 th\u1ed1ng X\u1eed l\u00fd \u0110\u01a1n h\u00e0ng<\/h3>\n

            Trong b\u1ed1i c\u1ea3nh th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed, c\u00e1c \u0111\u01a1n h\u00e0ng kh\u00e1c nhau v\u1ec1 k\u00edch th\u01b0\u1edbc v\u00e0 t\u00ecnh tr\u1ea1ng t\u1ed3n kho. M\u1ed9t n\u00fat quy\u1ebft \u0111\u1ecbnh \u0111\u00e1nh gi\u00e1 chi ti\u1ebft \u0111\u01a1n h\u00e0ng.<\/p>\n

              \n
            • Quy\u1ebft \u0111\u1ecbnh:<\/strong>H\u00e0ng t\u1ed3n kho c\u00f3 s\u1eb5n kh\u00f4ng?<\/li>\n
            • Nh\u00e1nh 1:<\/strong>C\u00f3 \u2192 X\u1eed l\u00fd thanh to\u00e1n.<\/li>\n
            • Nh\u00e1nh 2:<\/strong>Kh\u00f4ng \u2192 Th\u00f4ng b\u00e1o cho kh\u00e1ch h\u00e0ng.<\/li>\n<\/ul>\n

              H\u01a1n n\u1eefa, m\u1ed9t n\u00fat quy\u1ebft \u0111\u1ecbnh th\u1ee9 hai c\u00f3 th\u1ec3 ki\u1ec3m tra tr\u1ea1ng th\u00e1i thanh to\u00e1n. N\u1ebfu thanh to\u00e1n th\u1ea5t b\u1ea1i, \u0111\u01a1n h\u00e0ng s\u1ebd b\u1ecb h\u1ee7y. N\u1ebfu th\u00e0nh c\u00f4ng, \u0111\u01a1n h\u00e0ng s\u1ebd \u0111\u01b0\u1ee3c giao. Vi\u1ec7c l\u1ed3ng gh\u00e9p c\u00e1c n\u00fat quy\u1ebft \u0111\u1ecbnh n\u00e0y cho ph\u00e9p c\u00e1c quy t\u1eafc kinh doanh ph\u1ee9c t\u1ea1p \u0111\u01b0\u1ee3c tr\u1ef1c quan h\u00f3a m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng.<\/p>\n

              3. X\u1eed l\u00fd Ngo\u1ea1i l\u1ec7<\/h3>\n

              C\u00e1c h\u1ec7 th\u1ed1ng m\u1ea1nh m\u1ebd ph\u1ea3i x\u1eed l\u00fd l\u1ed7i. M\u1ed9t n\u00fat quy\u1ebft \u0111\u1ecbnh c\u00f3 th\u1ec3 ki\u1ec3m tra c\u00e1c gi\u00e1 tr\u1ecb null ho\u1eb7c tr\u1ea1ng th\u00e1i kh\u00f4ng mong \u0111\u1ee3i tr\u01b0\u1edbc khi ti\u1ebfp t\u1ee5c.<\/p>\n

                \n
              • Ki\u1ec3m tra:<\/strong>D\u1eef li\u1ec7u c\u00f3 h\u1ee3p l\u1ec7 kh\u00f4ng?<\/li>\n
              • \u0110\u00fang:<\/strong>Ti\u1ebfp t\u1ee5c x\u1eed l\u00fd.<\/li>\n
              • Sai:<\/strong>Ghi l\u1ed7i v\u00e0 k\u1ebft th\u00fac ho\u1eb7c th\u1eed l\u1ea1i.<\/li>\n<\/ul>\n

                Vi\u1ec7c s\u1eed d\u1ee5ng c\u00e1c n\u00fat quy\u1ebft \u0111\u1ecbnh cho c\u00e1c \u0111\u01b0\u1eddng d\u1eabn ngo\u1ea1i l\u1ec7 gi\u00fap ng\u0103n h\u1ec7 th\u1ed1ng s\u1eadp khi g\u1eb7p d\u1eef li\u1ec7u kh\u00f4ng mong \u0111\u1ee3i.<\/p>\n

                \ud83e\udde0 X\u1eed l\u00fd Logic Ph\u1ee9c t\u1ea1p<\/h2>\n

                Khi c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e1t tri\u1ec3n, c\u00e1c n\u00fat quy\u1ebft \u0111\u1ecbnh c\u00f3 th\u1ec3 tr\u1edf n\u00ean qu\u00e1 t\u1ea3i. Khi m\u1ed9t n\u00fat c\u00f3 qu\u00e1 nhi\u1ec1u c\u1ea1nh ra, t\u00ednh d\u1ec5 \u0111\u1ecdc s\u1ebd b\u1ecb \u1ea3nh h\u01b0\u1edfng. Trong nh\u1eefng tr\u01b0\u1eddng h\u1ee3p nh\u01b0 v\u1eady, n\u00ean chia nh\u1ecf logic th\u00e0nh c\u00e1c ho\u1ea1t \u0111\u1ed9ng con ho\u1eb7c c\u00e1c s\u01a1 \u0111\u1ed3 l\u1ed3ng gh\u00e9p.<\/p>\n

                Chi\u1ebfn l\u01b0\u1ee3c cho nh\u00e1nh ph\u1ee9c t\u1ea1p<\/h3>\n
                  \n
                • Ho\u1ea1t \u0111\u1ed9ng con:<\/strong>Bao b\u1ecdc m\u1ed9t c\u00e2y quy\u1ebft \u0111\u1ecbnh ph\u1ee9c t\u1ea1p trong m\u1ed9t h\u1ed9p ho\u1ea1t \u0111\u1ed9ng duy nh\u1ea5t.<\/li>\n
                • S\u01a1 \u0111\u1ed3 ph\u00e2n c\u1ea5p:<\/strong>T\u1ea1o b\u1ea3n t\u1ed5ng quan c\u1ea5p cao v\u00e0 \u0111i s\u00e2u v\u00e0o logic chi ti\u1ebft trong c\u00e1c s\u01a1 \u0111\u1ed3 ri\u00eang bi\u1ec7t.<\/li>\n
                • B\u1ea3ng tr\u1ea1ng th\u00e1i:<\/strong>\u0110\u1ed1i v\u1edbi logic c\u1ef1c k\u1ef3 ph\u1ee9c t\u1ea1p, b\u1ea3ng tr\u1ea1ng th\u00e1i c\u00f3 th\u1ec3 b\u1ed5 sung cho s\u01a1 \u0111\u1ed3, m\u1eb7c d\u00f9 s\u01a1 \u0111\u1ed3 v\u1eabn l\u00e0 c\u00f4ng c\u1ee5 tr\u1ef1c quan ch\u00ednh.<\/li>\n<\/ul>\n

                  L\u00e0m ph\u1ee9c t\u1ea1p h\u00f3a qu\u00e1 m\u1ee9c m\u1ed9t n\u00fat quy\u1ebft \u0111\u1ecbnh duy nh\u1ea5t c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn v\u1ea5n \u0111\u1ec1 b\u1ea3o tr\u00ec. C\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n t\u01b0\u01a1ng lai c\u00f3 th\u1ec3 g\u1eb7p kh\u00f3 kh\u0103n trong vi\u1ec7c theo d\u00f5i logic n\u1ebfu h\u00ecnh thoi c\u00f3 m\u01b0\u1eddi \u0111\u01b0\u1eddng ra. Gi\u1eef cho h\u1ec7 s\u1ed1 nh\u00e1nh th\u1ea5p s\u1ebd c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec.<\/p>\n

                  L\u1ed3ng gh\u00e9p c\u00e1c n\u00fat quy\u1ebft \u0111\u1ecbnh<\/h3>\n

                  \u0110\u00f4i khi, m\u1ed9t quy\u1ebft \u0111\u1ecbnh ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u01b0a ra d\u1ef1a tr\u00ean k\u1ebft qu\u1ea3 c\u1ee7a m\u1ed9t quy\u1ebft \u0111\u1ecbnh tr\u01b0\u1edbc \u0111\u00f3. \u0110i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 l\u1ed3ng gh\u00e9p.<\/p>\n

                    \n
                  • B\u01b0\u1edbc 1:<\/strong>Ki\u1ec3m tra xem ng\u01b0\u1eddi d\u00f9ng \u0111\u00e3 \u0111\u0103ng nh\u1eadp hay ch\u01b0a.<\/li>\n
                  • B\u01b0\u1edbc 2:<\/strong>N\u1ebfu c\u00f3, ki\u1ec3m tra xem ng\u01b0\u1eddi d\u00f9ng c\u00f3 ph\u1ea3i l\u00e0 qu\u1ea3n tr\u1ecb vi\u00ean hay kh\u00f4ng.<\/li>\n<\/ul>\n

                    Vi\u1ec7c ki\u1ec3m tra theo th\u1ee9 t\u1ef1 n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng \u0111i\u1ec1u ki\u1ec7n th\u1ee9 hai ch\u1ec9 \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 khi \u0111i\u1ec1u ki\u1ec7n \u0111\u1ea7u ti\u00ean l\u00e0 \u0111\u00fang. \u0110i\u1ec1u n\u00e0y t\u1ed1i \u01b0u h\u00f3a quy tr\u00ecnh b\u1eb1ng c\u00e1ch tr\u00e1nh c\u00e1c ki\u1ec3m tra kh\u00f4ng c\u1ea7n thi\u1ebft.<\/p>\n

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

                    Ngay c\u1ea3 nh\u1eefng ng\u01b0\u1eddi m\u00f4 h\u00ecnh h\u00f3a c\u00f3 kinh nghi\u1ec7m c\u0169ng c\u00f3 th\u1ec3 m\u1eafc sai l\u1ea7m. Nh\u1eadn th\u1ee9c v\u1ec1 nh\u1eefng l\u1ed7i ph\u1ed5 bi\u1ebfn gi\u00fap duy tr\u00ec t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a s\u01a1 \u0111\u1ed3.<\/p>\n

                    1. C\u00e1c \u0111\u01b0\u1eddng \u0111i b\u1ecb thi\u1ebfu<\/h3>\n

                    N\u1ebfu m\u1ed9t n\u00fat quy\u1ebft \u0111\u1ecbnh c\u00f3 hai \u0111\u01b0\u1eddng ra, nh\u01b0ng ch\u1ec9 m\u1ed9t \u0111\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u00e1n \u0111i\u1ec1u ki\u1ec7n, \u0111\u01b0\u1eddng c\u00f2n l\u1ea1i \u0111\u01b0\u1ee3c gi\u1ea3 \u0111\u1ecbnh l\u00e0 m\u1eb7c \u0111\u1ecbnh (sai). Tuy nhi\u00ean, n\u1ebfu c\u00e1c \u0111i\u1ec1u ki\u1ec7n kh\u00f4ng bao qu\u00e1t h\u1ebft, lu\u1ed3ng c\u00f3 th\u1ec3 b\u1ecb d\u1eebng l\u1ea1i. M\u1ecdi k\u1ebft qu\u1ea3 kh\u1ea3 thi \u0111\u1ec1u ph\u1ea3i c\u00f3 m\u1ed9t \u0111\u01b0\u1eddng \u0111i \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh.<\/p>\n

                    2. V\u00f2ng l\u1eb7p v\u00f4 h\u1ea1n<\/h3>\n

                    C\u00e1c n\u00fat quy\u1ebft \u0111\u1ecbnh c\u00f3 th\u1ec3 t\u1ea1o ra v\u00f2ng l\u1eb7p. N\u1ebfu m\u1ed9t \u0111i\u1ec1u ki\u1ec7n lu\u00f4n \u0111\u00e1nh gi\u00e1 l\u00e0 \u0111\u00fang, quy tr\u00ecnh c\u00f3 th\u1ec3 l\u1eb7p v\u00f4 h\u1ea1n. \u0110\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c \u0111i\u1ec1u ki\u1ec7n v\u00f2ng l\u1eb7p \u0111\u1ec1u c\u00f3 \u0111\u01b0\u1eddng tho\u00e1t.<\/p>\n

                    3. Nh\u00e3n m\u01a1 h\u1ed3<\/h3>\n

                    Nh\u00e3n nh\u01b0 [OK]<\/code> ho\u1eb7c [C\u00f3]<\/code> qu\u00e1 m\u01a1 h\u1ed3. S\u1eed d\u1ee5ng c\u00e1c \u0111i\u1ec1u ki\u1ec7n c\u1ee5 th\u1ec3 nh\u01b0 [status == active]<\/code>. S\u1ef1 m\u01a1 h\u1ed3 d\u1eabn \u0111\u1ebfn hi\u1ec3u nh\u1ea7m v\u1ec1 h\u00e0nh vi c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n

                    4. Pha tr\u1ed9n \u0111i\u1ec1u khi\u1ec3n v\u00e0 lu\u1ed3ng \u0111\u1ed1i t\u01b0\u1ee3ng<\/h3>\n

                    Kh\u00f4ng s\u1eed d\u1ee5ng n\u00fat quy\u1ebft \u0111\u1ecbnh \u0111\u1ec3 t\u00e1ch lu\u1ed3ng \u0111\u1ed1i t\u01b0\u1ee3ng. Lu\u1ed3ng \u0111\u1ed1i t\u01b0\u1ee3ng bi\u1ec3u di\u1ec5n s\u1ef1 di chuy\u1ec3n d\u1eef li\u1ec7u. Lu\u1ed3ng \u0111i\u1ec1u khi\u1ec3n bi\u1ec3u di\u1ec5n logic. Vi\u1ec7c pha tr\u1ed9n ch\u00fang s\u1ebd l\u00e0m r\u1ed1i ng\u1eef ngh\u0129a bi\u1ec3u \u0111\u1ed3.<\/p>\n

                    5. Ch\u1ebft ch\u1eb7n<\/h3>\n

                    Ch\u1ebft ch\u1eb7n x\u1ea3y ra khi hai ho\u1eb7c nhi\u1ec1u ho\u1ea1t \u0111\u1ed9ng ch\u1edd nhau. \u0110\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c n\u00fat quy\u1ebft \u0111\u1ecbnh kh\u00f4ng t\u1ea1o ra c\u00e1c ph\u1ee5 thu\u1ed9c v\u00f2ng tr\u00f2n ng\u0103n c\u1ea3n ti\u1ebfn tri\u1ec3n.<\/p>\n

                    \u2728 C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o r\u00f5 r\u00e0ng<\/h2>\n

                    Bi\u1ec3u \u0111\u1ed3 r\u00f5 r\u00e0ng truy\u1ec1n \u0111\u1ea1t hi\u1ec7u qu\u1ea3. Tu\u00e2n theo c\u00e1c h\u01b0\u1edbng d\u1eabn n\u00e0y \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o bi\u1ec3u \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a b\u1ea1n chuy\u00ean nghi\u1ec7p v\u00e0 d\u1ec5 hi\u1ec3u.<\/p>\n

                      \n
                    • T\u00ean g\u1ecdi nh\u1ea5t qu\u00e1n:<\/strong> S\u1eed d\u1ee5ng thu\u1eadt ng\u1eef chu\u1ea9n cho c\u00e1c \u0111i\u1ec1u ki\u1ec7n. Tr\u00e1nh d\u00f9ng t\u1eeb l\u00f3ng.<\/li>\n
                    • Hi\u1ec3u bi\u1ebft v\u1ec1 th\u1ee9 t\u1ef1 h\u00ecnh \u1ea3nh:<\/strong> S\u1eafp x\u1ebfp c\u00e1c n\u00fat \u0111\u1ec3 gi\u1ea3m thi\u1ec3u vi\u1ec7c giao nhau c\u1ee7a c\u00e1c \u0111\u01b0\u1eddng n\u1ed1i. B\u1ed1 c\u1ee5c s\u1ea1ch s\u1ebd gi\u00fap d\u1ec5 hi\u1ec3u h\u01a1n.<\/li>\n
                    • C\u00e1c l\u00e0n b\u01a1i:<\/strong> S\u1eed d\u1ee5ng c\u00e1c l\u00e0n b\u01a1i \u0111\u1ec3 ch\u1ec9 ra ai l\u00e0 ng\u01b0\u1eddi ho\u1eb7c th\u00e0nh ph\u1ea7n ch\u1ecbu tr\u00e1ch nhi\u1ec7m cho quy\u1ebft \u0111\u1ecbnh. \u0110i\u1ec1u n\u00e0y l\u00e0m r\u00f5 quy\u1ec1n s\u1edf h\u1eefu logic.<\/li>\n
                    • T\u00e0i li\u1ec7u:<\/strong> Th\u00eam ghi ch\u00fa cho c\u00e1c \u0111i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7 ph\u1ee9c t\u1ea1p. Gi\u1ea3i th\u00edch ngu\u1ed3n g\u1ed1c d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong \u0111i\u1ec1u ki\u1ec7n.<\/li>\n
                    • Xem x\u00e9t l\u1ea1i:<\/strong> H\u00e3y \u0111\u1ec3 \u0111\u1ed3ng nghi\u1ec7p xem x\u00e9t bi\u1ec3u \u0111\u1ed3. \u00c1nh m\u1eaft m\u1edbi s\u1ebd ph\u00e1t hi\u1ec7n nh\u1eefng kho\u1ea3ng tr\u1ed1ng logic m\u00e0 ng\u01b0\u1eddi t\u1ea1o c\u00f3 th\u1ec3 b\u1ecf s\u00f3t.<\/li>\n<\/ul>\n

                      \ud83d\udcca C\u00e1c t\u00ecnh hu\u1ed1ng n\u00e2ng cao<\/h2>\n

                      M\u00f4 h\u00ecnh h\u00f3a n\u00e2ng cao th\u01b0\u1eddng bao g\u1ed3m vi\u1ec7c t\u00edch h\u1ee3p c\u00e1c n\u00fat quy\u1ebft \u0111\u1ecbnh v\u1edbi c\u00e1c th\u00e0nh ph\u1ea7n UML kh\u00e1c.<\/p>\n

                      T\u01b0\u01a1ng t\u00e1c v\u1edbi c\u00e1c n\u00fat \u0111\u1ed1i t\u01b0\u1ee3ng<\/h3>\n

                      C\u00e1c n\u00fat \u0111\u1ed1i t\u01b0\u1ee3ng bi\u1ec3u di\u1ec5n d\u1eef li\u1ec7u. M\u1ed9t n\u00fat quy\u1ebft \u0111\u1ecbnh c\u00f3 th\u1ec3 ki\u1ec3m tra m\u1ed9t n\u00fat \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh h\u01b0\u1edbng \u0111i. V\u00ed d\u1ee5, m\u1ed9t n\u00fat ki\u1ec3m tra thu\u1ed9c t\u00ednh \u0111\u1ed1i t\u01b0\u1ee3ng orderStatus<\/code> \u0111\u1ed1i t\u01b0\u1ee3ng. \u0110i\u1ec1u n\u00e0y li\u00ean k\u1ebft logic tr\u1ef1c ti\u1ebfp v\u1edbi tr\u1ea1ng th\u00e1i d\u1eef li\u1ec7u.<\/p>\n

                      T\u01b0\u01a1ng t\u00e1c v\u1edbi lu\u1ed3ng \u0111\u1ed1i t\u01b0\u1ee3ng<\/h3>\n

                      Trong khi c\u00e1c n\u00fat quy\u1ebft \u0111\u1ecbnh ki\u1ec3m so\u00e1t lu\u1ed3ng, ch\u00fang th\u01b0\u1eddng t\u00e1c \u0111\u1ed9ng \u0111\u1ebfn c\u00e1c lu\u1ed3ng \u0111\u1ed1i t\u01b0\u1ee3ng. D\u1eef li\u1ec7u di chuy\u1ec3n qua h\u1ec7 th\u1ed1ng, v\u00e0 n\u00fat quy\u1ebft \u0111\u1ecbnh \u0111\u1ecbnh h\u01b0\u1edbng d\u1eef li\u1ec7u n\u00e0y \u0111\u1ebfn c\u00e1c b\u01b0\u1edbc x\u1eed l\u00fd kh\u00e1c nhau.<\/p>\n

                      Xem x\u00e9t v\u1ec1 t\u00ednh \u0111\u1ed3ng th\u1eddi<\/h3>\n

                      Khi s\u1eed d\u1ee5ng c\u00e1c n\u00fat fork v\u00e0 join c\u00f9ng v\u1edbi c\u00e1c n\u00fat quy\u1ebft \u0111\u1ecbnh, h\u00e3y c\u1ea9n tr\u1ecdng v\u1ec1 \u0111\u1ed3ng b\u1ed9 h\u00f3a. M\u1ed9t n\u00fat fork t\u1ea1o ra c\u00e1c lu\u1ed3ng song song. M\u1ed9t n\u00fat quy\u1ebft \u0111\u1ecbnh ch\u1ecdn m\u1ed9t nh\u00e1nh duy nh\u1ea5t. Vi\u1ec7c k\u1ebft h\u1ee3p ch\u00fang \u0111\u00f2i h\u1ecfi \u0111\u1ea3m b\u1ea3o lu\u1ed3ng \u0111i\u1ec1u khi\u1ec3n ph\u00f9 h\u1ee3p v\u1edbi k\u1ef3 v\u1ecdng v\u1ec1 lu\u1ed3ng \u0111\u1ed1i t\u01b0\u1ee3ng.<\/p>\n

                      \ud83d\udee0\ufe0f C\u00e1c c\u00e2n nh\u1eafc v\u1ec1 tri\u1ec3n khai<\/h2>\n

                      Khi chuy\u1ec3n \u0111\u1ed5i bi\u1ec3u \u0111\u1ed3 th\u00e0nh m\u00e3, c\u00e1c n\u00fat quy\u1ebft \u0111\u1ecbnh tr\u1edf th\u00e0nh c\u00e1c c\u00e2u l\u1ec7nh \u0111i\u1ec1u ki\u1ec7n. M\u1ed9t h\u00ecnh thoi trong bi\u1ec3u \u0111\u1ed3 t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t c\u00e2u l\u1ec7nh if<\/code> ho\u1eb7c chuy\u1ec3n \u0111\u1ed5i<\/code>c\u00e2u l\u1ec7nh trong ph\u1ea7n m\u1ec1m.<\/p>\n

                        \n
                      • \u0110i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7:<\/strong>Tr\u1edf th\u00e0nh bi\u1ec3u th\u1ee9c boolean trong m\u00e3 ngu\u1ed3n.<\/li>\n
                      • C\u00e1c \u0111\u01b0\u1eddng \u0111i:<\/strong>Tr\u1edf th\u00e0nh c\u00e1c nh\u00e1nh trong c\u1ea5u tr\u00fac m\u00e3 ngu\u1ed3n.<\/li>\n
                      • C\u00e1c n\u00fat h\u1ee3p nh\u1ea5t:<\/strong>Bi\u1ec3u di\u1ec5n \u0111i\u1ec3m m\u00e0 c\u00e1c nh\u00e1nh t\u00e1i h\u1ee3p trong qu\u00e1 tr\u00ecnh th\u1ef1c thi.<\/li>\n<\/ul>\n

                        \u0110\u1ea3m b\u1ea3o m\u00e3 ngu\u1ed3n kh\u1edbp v\u1edbi s\u01a1 \u0111\u1ed3 l\u00e0 \u0111i\u1ec1u quan tr\u1ecdng. Nh\u1eefng kh\u00e1c bi\u1ec7t gi\u1eefa thi\u1ebft k\u1ebf v\u00e0 tri\u1ec3n khai s\u1ebd d\u1eabn \u0111\u1ebfn n\u1ee3 k\u1ef9 thu\u1eadt. Vi\u1ec7c ki\u1ec3m tra m\u00e3 ngu\u1ed3n \u0111\u1ecbnh k\u1ef3 theo s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng gi\u00fap duy tr\u00ec s\u1ef1 \u0111\u1ed3ng b\u1ed9.<\/p>\n

                        \ud83d\udcdd T\u00f3m t\u1eaft c\u00e1c kh\u00e1i ni\u1ec7m ch\u00ednh<\/h2>\n

                        S\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng cung c\u1ea5p m\u1ed9t c\u00e1ch m\u1ea1nh m\u1ebd \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a quy tr\u00ecnh l\u00e0m vi\u1ec7c. C\u00e1c n\u00fat quy\u1ebft \u0111\u1ecbnh l\u00e0 c\u01a1 ch\u1ebf \u0111\u1ec3 \u0111\u01b0a logic v\u00e0 nh\u00e1nh v\u00e0o. \u0110i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7 x\u00e1c \u0111\u1ecbnh c\u00e1c quy t\u1eafc cho c\u00e1c nh\u00e1nh n\u00e0y. Vi\u1ec7c s\u1eed d\u1ee5ng \u0111\u00fang c\u00e1c n\u00fat quy\u1ebft \u0111\u1ecbnh v\u00e0 h\u1ee3p nh\u1ea5t \u0111\u1ea3m b\u1ea3o m\u00f4 h\u00ecnh ph\u1ea3n \u00e1nh ch\u00ednh x\u00e1c h\u00e0nh vi c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n

                        B\u1eb1ng c\u00e1ch tu\u00e2n th\u1ee7 c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t v\u00e0 tr\u00e1nh nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn, b\u1ea1n c\u00f3 th\u1ec3 t\u1ea1o ra c\u00e1c s\u01a1 \u0111\u1ed3 v\u1eeba ch\u00ednh x\u00e1c v\u1ec1 m\u1eb7t k\u1ef9 thu\u1eadt v\u1eeba d\u1ec5 hi\u1ec3u. C\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y \u0111\u00f3ng vai tr\u00f2 nh\u01b0 b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf cho ph\u00e1t tri\u1ec3n, giao ti\u1ebfp v\u00e0 b\u1ea3o tr\u00ec.<\/p>\n

                          \n
                        • N\u00fat quy\u1ebft \u0111\u1ecbnh:<\/strong>Chia t\u00e1ch lu\u1ed3ng d\u1ef1a tr\u00ean logic.<\/li>\n
                        • N\u00fat h\u1ee3p nh\u1ea5t:<\/strong>K\u1ebft h\u1ee3p lu\u1ed3ng m\u00e0 kh\u00f4ng c\u1ea7n logic.<\/li>\n
                        • \u0110i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7:<\/strong>Quy t\u1eafc x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1eddng \u0111i.<\/li>\n
                        • Lu\u1ed3ng:<\/strong>S\u1ef1 di chuy\u1ec3n c\u1ee7a \u0111i\u1ec1u khi\u1ec3n v\u00e0 d\u1eef li\u1ec7u.<\/li>\n<\/ul>\n

                          N\u1eafm v\u1eefng c\u00e1ch bi\u1ec3u di\u1ec5n lu\u1ed3ng \u0111i\u1ec1u khi\u1ec3n l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ed1i v\u1edbi b\u1ea5t k\u1ef3 ki\u1ebfn tr\u00fac s\u01b0 h\u1ec7 th\u1ed1ng hay nh\u00e0 ph\u00e2n t\u00edch n\u00e0o. C\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y t\u1ea1o c\u1ea7u n\u1ed1i gi\u1eefa c\u00e1c y\u00eau c\u1ea7u tr\u1eebu t\u01b0\u1ee3ng v\u00e0 tri\u1ec3n khai c\u1ee5 th\u1ec3.<\/p>\n","protected":false},"excerpt":{"rendered":"

                          S\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng \u0111\u00f3ng vai tr\u00f2 n\u1ec1n t\u1ea3ng \u0111\u1ec3 tr\u1ef1c quan h\u00f3a c\u00e1c kh\u00eda c\u1ea1nh \u0111\u1ed9ng c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng. Trong khi s\u01a1 \u0111\u1ed3 l\u01b0u \u0111\u1ed3 v\u00e0 m\u00e1y tr\u1ea1ng…<\/p>\n","protected":false},"author":1,"featured_media":619,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"S\u01a1 \u0111\u1ed3 Ho\u1ea1t \u0111\u1ed9ng UML: H\u01b0\u1edbng d\u1eabn v\u1ec1 N\u00fat Quy\u1ebft \u0111\u1ecbnh v\u00e0 Nh\u00e1nh","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1ch s\u1eed d\u1ee5ng n\u00fat quy\u1ebft \u0111\u1ecbnh v\u00e0 \u0111i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7 trong s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng UML. M\u1ed9t h\u01b0\u1edbng d\u1eabn k\u1ef9 thu\u1eadt v\u1ec1 logic nh\u00e1nh, c\u00fa ph\u00e1p v\u00e0 c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t.","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[13],"tags":[39,44],"class_list":["post-618","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unified-modeling-language","tag-academic","tag-activity-diagram"],"yoast_head":"\nS\u01a1 \u0111\u1ed3 Ho\u1ea1t \u0111\u1ed9ng UML: H\u01b0\u1edbng d\u1eabn v\u1ec1 N\u00fat Quy\u1ebft \u0111\u1ecbnh v\u00e0 Nh\u00e1nh<\/title>\n<meta name=\"description\" content=\"H\u1ecdc c\u00e1ch s\u1eed d\u1ee5ng n\u00fat quy\u1ebft \u0111\u1ecbnh v\u00e0 \u0111i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7 trong s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng UML. 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