{"id":648,"date":"2026-03-30T04:48:57","date_gmt":"2026-03-30T04:48:57","guid":{"rendered":"https:\/\/www.viz-tools.com\/vi\/resolving-race-conditions-uml-activity-diagram-logic\/"},"modified":"2026-03-30T04:48:57","modified_gmt":"2026-03-30T04:48:57","slug":"resolving-race-conditions-uml-activity-diagram-logic","status":"publish","type":"post","link":"https:\/\/www.viz-tools.com\/vi\/resolving-race-conditions-uml-activity-diagram-logic\/","title":{"rendered":"Nghi\u00ean c\u1ee9u tr\u01b0\u1eddng h\u1ee3p: Gi\u1ea3i quy\u1ebft c\u00e1c \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh b\u1eb1ng logic s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng UML"},"content":{"rendered":"

T\u00ednh \u0111\u1ed3ng th\u1eddi trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ea7n m\u1ec1m hi\u1ec7n \u0111\u1ea1i mang l\u1ea1i s\u1ef1 ph\u1ee9c t\u1ea1p \u0111\u00e1ng k\u1ec3. Khi nhi\u1ec1u lu\u1ed3ng ho\u1eb7c ti\u1ebfn tr\u00ecnh c\u00f9ng c\u1ed1 g\u1eafng truy c\u1eadp c\u00e1c t\u00e0i nguy\u00ean chung, h\u1ec7 th\u1ed1ng tr\u1edf n\u00ean d\u1ec5 b\u1ecb t\u1ed5n th\u01b0\u01a1ng tr\u01b0\u1edbc c\u00e1c \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh. Nh\u1eefng l\u1ed7i n\u00e0y th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n m\u1ed9t c\u00e1ch kh\u00f4ng l\u01b0\u1eddng tr\u01b0\u1edbc, khi\u1ebfn vi\u1ec7c t\u00e1i hi\u1ec7n v\u00e0 g\u1ee1 l\u1ed7i tr\u1edf n\u00ean kh\u00f3 kh\u0103n. \u0110\u1ec3 gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 n\u00e0y, c\u00e1c k\u1ef9 thu\u1eadt m\u00f4 h\u00ecnh h\u00f3a tr\u1ef1c quan tr\u1edf th\u00e0nh c\u00f4ng c\u1ee5 thi\u1ebft y\u1ebfu cho c\u00e1c ki\u1ebfn tr\u00fac s\u01b0 v\u00e0 nh\u00e0 ph\u00e1t tri\u1ec3n. C\u1ee5 th\u1ec3, s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng UML cung c\u1ea5p c\u00e1ch th\u1ee9c c\u00f3 c\u1ea5u tr\u00fac \u0111\u1ec3 bi\u1ec3u di\u1ec5n lu\u1ed3ng \u0111i\u1ec1u khi\u1ec3n v\u00e0 x\u00e1c \u0111\u1ecbnh c\u00e1c \u0111i\u1ec3m \u0111\u1ed3ng b\u1ed9 h\u00f3a tr\u01b0\u1edbc khi vi\u1ebft m\u00e3 ngu\u1ed3n.<\/p>\n

H\u01b0\u1edbng d\u1eabn n\u00e0y kh\u00e1m ph\u00e1 m\u1ed9t t\u00ecnh hu\u1ed1ng th\u1ef1c t\u1ebf n\u01a1i c\u00e1c \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh v\u00e0 gi\u1ea3i quy\u1ebft b\u1eb1ng logic s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng UML. Ch\u00fang ta s\u1ebd \u0111i qua qu\u00e1 tr\u00ecnh m\u00f4 h\u00ecnh h\u00f3a, ph\u00e2n t\u00edch c\u00e1c r\u1ee7i ro \u0111\u1ed3ng th\u1eddi, v\u00e0 tri\u1ec3n khai c\u00e1c thao t\u00e1c \u0111\u1ed3ng b\u1ed9 d\u1ef1a tr\u00ean m\u00f4 h\u00ecnh tr\u1ef1c quan. Tr\u1ecdng t\u00e2m v\u1eabn n\u1eb1m \u1edf s\u1ef1 r\u00f5 r\u00e0ng v\u1ec1 ki\u1ebfn tr\u00fac v\u00e0 t\u00ednh nh\u1ea5t qu\u00e1n v\u1ec1 m\u1eb7t logic ch\u1ee9 kh\u00f4ng ph\u1ea3i v\u00e0o ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh hay c\u00f4ng c\u1ee5 c\u1ee5 th\u1ec3.<\/p>\n

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\"Cute<\/figure>\n<\/div>\n

Hi\u1ec3u r\u00f5 c\u00e1c r\u1ee7i ro v\u1ec1 \u0111\u1ed3ng th\u1eddi \u26a0\ufe0f<\/h2>\n

Tr\u01b0\u1edbc khi b\u01b0\u1edbc v\u00e0o nghi\u00ean c\u1ee9u tr\u01b0\u1eddng h\u1ee3p, c\u1ea7n ph\u1ea3i x\u00e1c \u0111\u1ecbnh r\u00f5 v\u1ea5n \u0111\u1ec1 c\u1ed1t l\u00f5i. M\u1ed9t \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh x\u1ea3y ra khi k\u1ebft qu\u1ea3 c\u1ee7a m\u1ed9t qu\u00e1 tr\u00ecnh ph\u1ee5 thu\u1ed9c v\u00e0o th\u1ee9 t\u1ef1 ho\u1eb7c th\u1eddi \u0111i\u1ec3m c\u1ee7a c\u00e1c s\u1ef1 ki\u1ec7n kh\u00f4ng th\u1ec3 ki\u1ec3m so\u00e1t kh\u00e1c. Trong b\u1ed1i c\u1ea3nh s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng, \u0111i\u1ec1u n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c d\u1ecbch th\u00e0nh c\u00e1c nh\u00e1nh song song t\u01b0\u01a1ng t\u00e1c v\u1edbi m\u1ed9t tr\u1ea1ng th\u00e1i chung m\u00e0 kh\u00f4ng c\u00f3 s\u1ef1 ph\u1ed1i h\u1ee3p ph\u00f9 h\u1ee3p.<\/p>\n

C\u00e1c lo\u1ea1i \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh ph\u1ed5 bi\u1ebfn<\/h3>\n
    \n
  • \u0110i\u1ec1u ki\u1ec7n c\u1ea1nh tranh d\u1eef li\u1ec7u:<\/strong>Hai ho\u1eb7c nhi\u1ec1u h\u00e0nh \u0111\u1ed9ng truy c\u1eadp c\u00f9ng m\u1ed9t d\u1eef li\u1ec7u, v\u00e0 \u00edt nh\u1ea5t m\u1ed9t h\u00e0nh \u0111\u1ed9ng l\u00e0 thao t\u00e1c ghi, m\u00e0 kh\u00f4ng c\u00f3 s\u1ef1 \u0111\u1ed3ng b\u1ed9.<\/li>\n
  • \u0110i\u1ec1u ki\u1ec7n c\u1ea1nh tranh logic:<\/strong>Th\u1ee9 t\u1ef1 th\u1ef1c hi\u1ec7n c\u00e1c thao t\u00e1c l\u00e0 quan tr\u1ecdng, nh\u01b0ng lu\u1ed3ng th\u1ef1c thi cho ph\u00e9p c\u00e1c ho\u00e1n v\u1ecb kh\u00f4ng h\u1ee3p l\u1ec7.<\/li>\n
  • C\u1ea1nh tranh t\u00e0i nguy\u00ean:<\/strong>Nhi\u1ec1u lu\u1ed3ng c\u1ea1nh tranh \u0111\u1ec3 s\u1eed d\u1ee5ng m\u1ed9t t\u00e0i nguy\u00ean h\u1ea1n ch\u1ebf, d\u1eabn \u0111\u1ebfn t\u00ecnh tr\u1ea1ng b\u1ecb b\u1ecf r\u01a1i ho\u1eb7c k\u1eb9t ch\u1edd.<\/li>\n<\/ul>\n

    Vi\u1ec7c ph\u00e1t hi\u1ec7n nh\u1eefng v\u1ea5n \u0111\u1ec1 n\u00e0y trong m\u00e3 ngu\u1ed3n th\u01b0\u1eddng l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh ph\u1ea3n \u1ee9ng. Ph\u00e1t hi\u1ec7n ch\u00fang trong m\u00f4 h\u00ecnh l\u00e0 m\u1ed9t h\u00e0nh \u0111\u1ed9ng ch\u1ee7 \u0111\u1ed9ng. B\u1eb1ng c\u00e1ch tr\u1ef1c quan h\u00f3a lu\u1ed3ng, c\u00e1c ki\u1ebfn tr\u00fac s\u01b0 c\u00f3 th\u1ec3 nh\u1eadn ra n\u01a1i m\u00e0 nhi\u1ec1u lu\u1ed3ng c\u00f3 th\u1ec3 h\u1ed9i t\u1ee5 t\u1ea1i m\u1ed9t n\u00fat chung m\u00e0 kh\u00f4ng c\u00f3 c\u01a1 ch\u1ebf trao \u0111\u1ed5i r\u00f5 r\u00e0ng.<\/p>\n

    Vai tr\u00f2 c\u1ee7a s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng UML \ud83d\udcca<\/h2>\n

    S\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng UML \u0111\u1eb7c bi\u1ec7t ph\u00f9 h\u1ee3p \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a t\u00ednh \u0111\u1ed3ng th\u1eddi v\u00ec ch\u00fang h\u1ed7 tr\u1ee3 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng lu\u1ed3ng \u0111i\u1ec1u khi\u1ec3n \u0111\u1ea1i di\u1ec7n cho vi\u1ec7c th\u1ef1c thi song song. C\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh bao g\u1ed3m:<\/p>\n

      \n
    • N\u00fat chia nh\u00e1nh:<\/strong>\u0110\u1ea1i di\u1ec7n cho vi\u1ec7c chia m\u1ed9t lu\u1ed3ng duy nh\u1ea5t th\u00e0nh nhi\u1ec1u lu\u1ed3ng \u0111\u1ed3ng th\u1eddi.<\/li>\n
    • N\u00fat h\u1ee3p nh\u1ea5t:<\/strong>\u0110\u1ea1i di\u1ec7n cho \u0111i\u1ec3m \u0111\u1ed3ng b\u1ed9 h\u00f3a n\u01a1i c\u00e1c lu\u1ed3ng \u0111\u1ed3ng th\u1eddi h\u1ed9i t\u1ee5.<\/li>\n
    • Lu\u1ed3ng \u0111i\u1ec1u khi\u1ec3n:<\/strong>X\u00e1c \u0111\u1ecbnh th\u1ee9 t\u1ef1 c\u00e1c ho\u1ea1t \u0111\u1ed9ng.<\/li>\n
    • Lu\u1ed3ng \u0111\u1ed1i t\u01b0\u1ee3ng:<\/strong>Hi\u1ec3n th\u1ecb s\u1ef1 di chuy\u1ec3n d\u1eef li\u1ec7u gi\u1eefa c\u00e1c n\u00fat.<\/li>\n<\/ul>\n

      Khi m\u00f4 h\u00ecnh h\u00f3a m\u1ed9t h\u1ec7 th\u1ed1ng, c\u00e1c n\u00fat n\u00e0y \u0111\u00f3ng vai tr\u00f2 nh\u01b0 b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf cho qu\u1ea3n l\u00fd lu\u1ed3ng. N\u1ebfu m\u1ed9t n\u00fat chia nh\u00e1nh t\u1ea1o ra hai nh\u00e1nh \u0111\u1ec1u ghi v\u00e0o c\u00f9ng m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng tr\u01b0\u1edbc khi x\u1ea3y ra n\u00fat h\u1ee3p nh\u1ea5t, th\u00ec \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh c\u00f3 kh\u1ea3 n\u0103ng cao \u0111ang t\u1ed3n t\u1ea1i trong thi\u1ebft k\u1ebf.<\/p>\n

      B\u1ed1i c\u1ea3nh nghi\u00ean c\u1ee9u tr\u01b0\u1eddng h\u1ee3p: X\u1eed l\u00fd giao d\u1ecbch ph\u00e2n t\u00e1n \ud83d\udd04<\/h2>\n

      X\u00e9t m\u1ed9t h\u1ec7 th\u1ed1ng x\u1eed l\u00fd \u0111\u01a1n h\u00e0ng t\u1ed5ng qu\u00e1t. H\u1ec7 th\u1ed1ng n\u00e0y x\u1eed l\u00fd c\u00e1c y\u00eau c\u1ea7u \u0111\u1ea7u v\u00e0o, x\u00e1c th\u1ef1c d\u1eef li\u1ec7u, c\u1eadp nh\u1eadt kho h\u00e0ng v\u00e0 ghi nh\u1eadn c\u00e1c giao d\u1ecbch t\u00e0i ch\u00ednh. Ki\u1ebfn tr\u00fac d\u1ef1a v\u00e0o x\u1eed l\u00fd song song \u0111\u1ec3 duy tr\u00ec \u0111\u1ed9 tr\u1ec5 th\u1ea5p. Nhi\u1ec1u t\u00e1c nh\u00e2n x\u1eed l\u00fd c\u00e1c giai \u0111o\u1ea1n kh\u00e1c nhau trong v\u00f2ng \u0111\u1eddi \u0111\u01a1n h\u00e0ng \u0111\u1ed3ng th\u1eddi.<\/p>\n

      Y\u00eau c\u1ea7u h\u1ec7 th\u1ed1ng<\/h3>\n
        \n
      • T\u1ed1c \u0111\u1ed9 x\u1eed l\u00fd cao cho vi\u1ec7c ti\u1ebfp nh\u1eadn \u0111\u01a1n h\u00e0ng.<\/li>\n
      • T\u00ednh nh\u1ea5t qu\u00e1n nghi\u00eam ng\u1eb7t cho m\u1ee9c t\u1ed3n kho.<\/li>\n
      • T\u00ednh nguy\u00ean t\u1eed cho c\u00e1c h\u1ed3 s\u01a1 t\u00e0i ch\u00ednh.<\/li>\n
      • C\u1eadp nh\u1eadt tr\u1ea1ng th\u00e1i th\u1eddi gian th\u1ef1c cho giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng.<\/li>\n<\/ul>\n

        Thi\u1ebft k\u1ebf ban \u0111\u1ea7u gi\u1ea3 \u0111\u1ecbnh r\u1eb1ng c\u00e1c lu\u1ed3ng song song s\u1ebd kh\u00f4ng xung \u0111\u1ed9t. Tuy nhi\u00ean, trong qu\u00e1 tr\u00ecnh ki\u1ec3m th\u1eed t\u1ea3i, s\u1ed1 l\u01b0\u1ee3ng t\u1ed3n kho th\u1ec9nh tho\u1ea3ng gi\u1ea3m xu\u1ed1ng d\u01b0\u1edbi m\u1ee9c zero, v\u00e0 h\u1ed3 s\u01a1 t\u00e0i ch\u00ednh cho th\u1ea5y c\u00e1c kho\u1ea3n ph\u00ed b\u1ecb tr\u00f9ng l\u1eb7p. Nguy\u00ean nh\u00e2n g\u1ed1c r\u1ec5 l\u00e0 m\u1ed9t \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh trong logic c\u1eadp nh\u1eadt t\u1ed3n kho.<\/p>\n

        M\u00f4 h\u00ecnh ban \u0111\u1ea7u: Lu\u1ed3ng b\u1ecb l\u1ed7i \ud83e\udde9<\/h2>\n

        B\u01b0\u1edbc \u0111\u1ea7u ti\u00ean trong vi\u1ec7c gi\u1ea3i quy\u1ebft l\u00e0 chuy\u1ec3n \u0111\u1ed5i logic hi\u1ec7n c\u00f3 th\u00e0nh s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng UML. M\u1ee5c ti\u00eau l\u00e0 tr\u1ef1c quan h\u00f3a lu\u1ed3ng \u0111i\u1ec1u khi\u1ec3n t\u1eeb l\u00fac nh\u1eadn \u0111\u01a1n h\u00e0ng \u0111\u1ebfn l\u00fac x\u00e1c nh\u1eadn \u0111\u01a1n h\u00e0ng.<\/p>\n

        C\u00e1c th\u00e0nh ph\u1ea7n s\u01a1 \u0111\u1ed3 \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh<\/h3>\n
          \n
        • N\u00fat b\u1eaft \u0111\u1ea7u:<\/strong> Ti\u1ebfp nh\u1eadn \u0111\u01a1n h\u00e0ng.<\/li>\n
        • N\u00fat chia nh\u00e1nh:<\/strong> Chia th\u00e0nh X\u00e1c minh, Ki\u1ec3m tra t\u1ed3n kho v\u00e0 X\u1eed l\u00fd thanh to\u00e1n.<\/li>\n
        • Ho\u1ea1t \u0111\u1ed9ng song song:<\/strong> M\u1ed7i nh\u00e1nh ch\u1ea1y \u0111\u1ed9c l\u1eadp.<\/li>\n
        • N\u00fat h\u1ee3p nh\u1ea5t:<\/strong> T\u1ea5t c\u1ea3 c\u00e1c nh\u00e1nh ph\u1ea3i ho\u00e0n th\u00e0nh tr\u01b0\u1edbc khi x\u00e1c nh\u1eadn.<\/li>\n<\/ul>\n

          Sau khi xem x\u00e9t s\u01a1 \u0111\u1ed3, v\u1ea5n \u0111\u1ec1 sau \u0111\u00e2y \u0111\u00e3 xu\u1ea5t hi\u1ec7n. Nh\u00e1nh Ki\u1ec3m tra t\u1ed3n kho<\/em> \u0111\u1ecdc m\u1ee9c t\u1ed3n kho hi\u1ec7n t\u1ea1i. \u0110\u1ed3ng th\u1eddi, nh\u00e1nh X\u1eed l\u00fd thanh to\u00e1n<\/em> c\u00f3 th\u1ec3 k\u00edch ho\u1ea1t vi\u1ec7c \u0111\u1eb7t c\u1ecdc cho s\u1ed1 t\u1ed3n kho \u0111\u00f3. N\u1ebfu c\u1ea3 hai lu\u1ed3ng \u0111\u1ec1u \u0111\u1ecdc t\u1ed3n kho l\u00e0 10, v\u00e0 c\u1ea3 hai c\u00f9ng c\u1ed1 g\u1eafng \u0111\u1eb7t c\u1ecdc, th\u00ec s\u1ed1 l\u01b0\u1ee3ng cu\u1ed1i c\u00f9ng c\u00f3 th\u1ec3 sai.<\/p>\n

          Tr\u1ef1c quan h\u00f3a xung \u0111\u1ed9t<\/h3>\n\n\n\n\n\n\n\n
          Nh\u00e1nh ho\u1ea1t \u0111\u1ed9ng<\/th>\nThao t\u00e1c<\/th>\nT\u00e0i nguy\u00ean chung<\/th>\nR\u1ee7i ro v\u1ec1 th\u1eddi gian<\/th>\n<\/tr>\n<\/thead>\n
          Ki\u1ec3m tra t\u1ed3n kho<\/td>\n\u0110\u1ecdc m\u1ee9c t\u1ed3n kho<\/td>\nD\u00f2ng c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/td>\nCao (tr\u01b0\u1edbc khi ghi)<\/td>\n<\/tr>\n
          X\u1eed l\u00fd thanh to\u00e1n<\/td>\n\u0110\u1eb7t c\u1ecdc t\u1ed3n kho<\/td>\nD\u00f2ng c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/td>\nCao (ghi \u0111\u1ed3ng th\u1eddi)<\/td>\n<\/tr>\n
          X\u1eed l\u00fd \u0111\u01a1n h\u00e0ng<\/td>\nC\u1eadp nh\u1eadt tr\u1ea1ng th\u00e1i<\/td>\nGhi ch\u00e9p nh\u1eadt k\u00fd<\/td>\nTrung b\u00ecnh (ch\u1ec9 th\u00eam)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          B\u1ea3ng n\u00e0y l\u00e0m n\u1ed5i b\u1eadt n\u01a1i t\u00e0i nguy\u00ean chung \u0111\u01b0\u1ee3c truy c\u1eadp. L\u1ed7 h\u1ed5ng nghi\u00eam tr\u1ecdng n\u1eb1m \u1edf ph\u1ea7nKi\u1ec3m tra t\u1ed3n kho<\/strong> v\u00e0 X\u1eed l\u00fd thanh to\u00e1n<\/strong> c\u00e1c nh\u00e1nh t\u01b0\u01a1ng t\u00e1c v\u1edbi c\u00f9ng m\u1ed9t h\u00e0ng c\u01a1 s\u1edf d\u1eef li\u1ec7u m\u00e0 kh\u00f4ng c\u00f3 lo\u1ea1i tr\u1eeb l\u1eabn nhau.<\/p>\n

          Tinh ch\u1ec9nh logic: M\u00f4 h\u00ecnh \u0111\u1ed3ng b\u1ed9 h\u00f3a \ud83d\udee0\ufe0f<\/h2>\n

          \u0110\u1ec3 gi\u1ea3i quy\u1ebft \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh, s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1eeda \u0111\u1ed5i \u0111\u1ec3 bao g\u1ed3m c\u00e1c c\u01a1 ch\u1ebf \u0111\u1ed3ng b\u1ed9 h\u00f3a r\u00f5 r\u00e0ng. M\u1ee5c ti\u00eau l\u00e0 \u0111\u1ea3m b\u1ea3o r\u1eb1ng vi\u1ec7c c\u1eadp nh\u1eadt t\u1ed3n kho x\u1ea3y ra m\u1ed9t c\u00e1ch nguy\u00ean t\u1eed c\u00f9ng v\u1edbi x\u00e1c nh\u1eadn thanh to\u00e1n.<\/p>\n

          Tri\u1ec3n khai \u0111i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7<\/h3>\n

          C\u00e1c \u0111i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7 trong s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng cho ph\u00e9p ch\u00fang ta x\u00e1c \u0111\u1ecbnh c\u00e1c y\u00eau c\u1ea7u logic cho c\u00e1c chuy\u1ec3n ti\u1ebfp. Ch\u00fang t\u00f4i \u0111\u00e3 \u0111\u01b0a v\u00e0o m\u1ed9t \u0111i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7 cho nh\u00e1nhX\u1eed l\u00fd thanh to\u00e1n<\/em> nh\u00e1nh. \u0110i\u1ec1u ki\u1ec7n n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng vi\u1ec7c \u0111\u1eb7t gi\u1eef h\u00e0ng ch\u1ec9 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n n\u1ebfu ki\u1ec3m tra t\u1ed3n kho x\u00e1c nh\u1eadn s\u1ef1 s\u1eb5n c\u00f3.<\/p>\n

            \n
          • \u0110i\u1ec1u ki\u1ec7n:<\/strong> if (s\u1ed1 l\u01b0\u1ee3ngHi\u1ec7nT\u1ea1i > 0)<\/code><\/li>\n
          • T\u00e1c \u0111\u1ed9ng:<\/strong> Ng\u0103n ch\u1eb7n lu\u1ed3ng \u0111\u1eb7t gi\u1eef h\u00e0ng ti\u1ebfp t\u1ee5c n\u1ebfu t\u1ed3n kho kh\u00f4ng \u0111\u1ee7.<\/li>\n
          • H\u1ea1n ch\u1ebf:<\/strong> \u0110i\u1ec1u n\u00e0y ri\u00eang l\u1ebb kh\u00f4ng ng\u0103n \u0111\u01b0\u1ee3c t\u00ecnh tr\u1ea1ng c\u1ea1nh tranh n\u1ebfu s\u1ed1 l\u01b0\u1ee3ng t\u1ed3n kho thay \u0111\u1ed5i gi\u1eefa l\u00fac ki\u1ec3m tra v\u00e0 l\u00fac ghi.<\/li>\n<\/ul>\n

            Gi\u1edbi thi\u1ec7u ng\u1eef ngh\u0129a Mutex<\/h3>\n

            \u0110\u1ec3 \u0111\u1ea3m b\u1ea3o an to\u00e0n, s\u01a1 \u0111\u1ed3 \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt \u0111\u1ec3 ph\u1ea3n \u00e1nh m\u1ed9t kh\u00f3a mutex. Trong b\u1ed1i c\u1ea3nh s\u01a1 \u0111\u1ed3, \u0111i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng m\u1ed9t n\u00fat ho\u1ea1t \u0111\u1ed9ng c\u1ee5 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u00e1nh nh\u00e3nKh\u00f3a t\u1ed3n kho<\/em>. N\u00fat n\u00e0y ho\u1ea1t \u0111\u1ed9ng nh\u01b0 m\u1ed9t r\u00e0o c\u1ea3n.<\/p>\n

            Lu\u1ed3ng \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1eeda \u0111\u1ed5i tr\u00f4ng nh\u01b0 sau:<\/p>\n

              \n
            1. \u0110\u01a1n h\u00e0ng \u0111\u00e3 nh\u1eadn.<\/li>\n
            2. Chia th\u00e0nh X\u00e1c minh v\u00e0 Thanh to\u00e1n.<\/li>\n
            3. Nh\u00e1nh Thanh to\u00e1n b\u01b0\u1edbc v\u00e0oKh\u00f3a kho h\u00e0ng<\/strong> ho\u1ea1t \u0111\u1ed9ng.<\/li>\n
            4. Trong khi b\u1ecb kh\u00f3a, h\u1ec7 th\u1ed1ng th\u1ef1c hi\u1ec7n ki\u1ec3m tra v\u00e0 c\u1eadp nh\u1eadt.<\/li>\n
            5. Kh\u00f3a \u0111\u01b0\u1ee3c gi\u1ea3i ph\u00f3ng sau khi c\u1eadp nh\u1eadt ho\u00e0n t\u1ea5t.<\/li>\n
            6. Nh\u00e1nh x\u00e1c minh ch\u1edd kh\u00f3a ho\u1eb7c ti\u1ebfp t\u1ee5c \u0111\u1ed9c l\u1eadp n\u1ebfu kh\u00f4ng c\u1ea7n thay \u0111\u1ed5i kho h\u00e0ng.<\/li>\n<\/ol>\n

              C\u00e1c thay \u0111\u1ed5i trong bi\u1ec3u di\u1ec5n tr\u1ef1c quan<\/h3>\n

              N\u00fat chia \u0111\u00e3 \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh. Thay v\u00ec m\u1ed9t s\u1ef1 t\u00e1ch r\u1eddi t\u1ef1 do, n\u00fat n\u1ed1i gi\u1edd y\u00eau c\u1ea7u m\u1ed9t t\u00edn hi\u1ec7u \u0111\u1ed3ng b\u1ed9 c\u1ee5 th\u1ec3. T\u00edn hi\u1ec7u n\u00e0y cho bi\u1ebft ph\u1ea7n quan tr\u1ecdng (c\u1eadp nh\u1eadt kho h\u00e0ng) \u0111\u00e3 ho\u00e0n t\u1ea5t m\u1ed9t c\u00e1ch an to\u00e0n.<\/p>\n

              X\u00e1c \u0111\u1ecbnh \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh trong s\u01a1 \u0111\u1ed3 \ud83d\udd0d<\/h2>\n

              S\u1eed d\u1ee5ng m\u00f4 h\u00ecnh \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1eeda \u0111\u1ed5i, ch\u00fang ta c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh r\u00f5 r\u00e0ng n\u01a1i x\u1ea3y ra \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh v\u00e0 c\u00e1ch s\u1eeda l\u1ed7i l\u00e0m thay \u0111\u1ed5i lu\u1ed3ng.<\/p>\n

              M\u1eabu v\u1ea5n \u0111\u1ec1<\/h3>\n
                \n
              • Hai nh\u00e1nh song song truy c\u1eadp v\u00e0o m\u1ed9t n\u00fat d\u1eef li\u1ec7u chung.<\/li>\n
              • Kh\u00f4ng c\u00f3 n\u00fat n\u1ed1i n\u00e0o t\u1ed3n t\u1ea1i gi\u1eefa c\u00e1c \u0111i\u1ec3m truy c\u1eadp.<\/li>\n
              • Th\u1ee9 t\u1ef1 th\u1ef1c thi l\u00e0 kh\u00f4ng x\u00e1c \u0111\u1ecbnh.<\/li>\n<\/ul>\n

                M\u1eabu \u0111\u00e3 \u0111\u01b0\u1ee3c gi\u1ea3i quy\u1ebft<\/h3>\n
                  \n
                • M\u1ed9t nh\u00e1nh \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n tu\u1ea7n t\u1ef1 th\u00f4ng qua n\u00fat kh\u00f3a.<\/li>\n
                • C\u00e1c nh\u00e1nh kh\u00e1c ch\u1edd ho\u1eb7c b\u1ecb b\u1ecf qua cho \u0111\u1ebfn khi kh\u00f3a \u0111\u01b0\u1ee3c gi\u1ea3i ph\u00f3ng.<\/li>\n
                • M\u1ed9t n\u00fat n\u1ed1i \u0111\u1ea3m b\u1ea3o t\u1ea5t c\u1ea3 c\u00e1c c\u1eadp nh\u1eadt quan tr\u1ecdng \u0111\u01b0\u1ee3c ho\u00e0n t\u1ea5t tr\u01b0\u1edbc khi ti\u1ebfp t\u1ee5c.<\/li>\n<\/ul>\n

                  S\u1ef1 ph\u00e2n bi\u1ec7t tr\u1ef1c quan n\u00e0y l\u00e0m r\u00f5 chi\u1ebfn l\u01b0\u1ee3c \u0111\u1ed3ng th\u1eddi cho c\u00e1c b\u00ean li\u00ean quan. N\u00f3 chuy\u1ec3n cu\u1ed9c th\u1ea3o lu\u1eadn t\u1eeb m\u00e3 tr\u1eebu t\u01b0\u1ee3ng sang logic lu\u1ed3ng c\u1ee5 th\u1ec3.<\/p>\n

                  Chi\u1ebfn l\u01b0\u1ee3c x\u00e1c minh v\u00e0 ki\u1ec3m th\u1eed \ud83e\uddea<\/h2>\n

                  Sau khi s\u01a1 \u0111\u1ed3 \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt, chi\u1ebfn l\u01b0\u1ee3c ki\u1ec3m th\u1eed \u0111\u00e3 \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ec9nh ph\u00f9 h\u1ee3p v\u1edbi m\u00f4 h\u00ecnh. S\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng \u0111\u00f3ng vai tr\u00f2 l\u00e0 ngu\u1ed3n tin c\u1eady cho c\u00e1c tr\u01b0\u1eddng h\u1ee3p ki\u1ec3m th\u1eed.<\/p>\n

                  Ki\u1ec3m th\u1eed d\u1ef1a tr\u00ean m\u00f4 h\u00ecnh<\/h3>\n

                  Ng\u01b0\u1eddi ki\u1ec3m th\u1eed s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 \u0111\u1ec3 t\u1ea1o ra c\u00e1c t\u00ecnh hu\u1ed1ng ki\u1ec3m th\u1eed c\u00e1c nh\u00e1nh song song. S\u1ef1 ch\u00fa \u00fd \u0111\u1eb7c bi\u1ec7t \u0111\u01b0\u1ee3c d\u00e0nh choKh\u00f3a kho h\u00e0ng<\/em> n\u00fat.<\/p>\n

                    \n
                  • Ki\u1ec3m th\u1eed t\u1ea3i tr\u1ecdng:<\/strong> Ch\u1ea1y nhi\u1ec1u lu\u1ed3ng c\u00f9ng l\u00fac c\u1ed1 g\u1eafng truy c\u1eadp n\u00fat kho h\u00e0ng.<\/li>\n
                  • Ki\u1ec3m th\u1eed th\u1eddi gian ch\u1edd:<\/strong> X\u00e1c minh r\u1eb1ng n\u1ebfu kh\u00f3a \u0111\u01b0\u1ee3c gi\u1eef qu\u00e1 l\u00e2u, h\u1ec7 th\u1ed1ng s\u1ebd kh\u00f4ng b\u1ecb k\u1eb9t.<\/li>\n
                  • Ki\u1ec3m th\u1eed ch\u00e8n l\u1ed7i:<\/strong> M\u00f4 ph\u1ecfng m\u1ed9t s\u1ef1 c\u1ed1 x\u1ea3y ra trong qu\u00e1 tr\u00ecnh kh\u00f3a \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o kh\u00f3a \u0111\u01b0\u1ee3c gi\u1ea3i ph\u00f3ng.<\/li>\n<\/ul>\n

                    Ma tr\u1eadn truy xu\u1ea5t ngu\u1ed3n g\u1ed1c<\/h3>\n

                    Ma tr\u1eadn truy xu\u1ea5t ngu\u1ed3n g\u1ed1c li\u00ean k\u1ebft m\u1ed7i n\u00fat ho\u1ea1t \u0111\u1ed9ng trong s\u01a1 \u0111\u1ed3 v\u1edbi m\u1ed9t tr\u01b0\u1eddng h\u1ee3p ki\u1ec3m th\u1eed c\u1ee5 th\u1ec3. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u1ecdi \u0111i\u1ec3m \u0111\u1ed3ng b\u1ed9 h\u00f3a \u0111\u1ec1u \u0111\u01b0\u1ee3c x\u00e1c minh.<\/p>\n\n\n\n\n\n\n\n
                    N\u00fat s\u01a1 \u0111\u1ed3<\/th>\nB\u1ed1i c\u1ea3nh ki\u1ec3m th\u1eed<\/th>\nK\u1ebft qu\u1ea3 mong \u0111\u1ee3i<\/th>\nTr\u1ea1ng th\u00e1i<\/th>\n<\/tr>\n<\/thead>\n
                    N\u00fat chia nh\u00e1nh<\/td>\nNh\u1eadp d\u1eef li\u1ec7u song song<\/td>\nC\u1ea3 hai lu\u1ed3ng \u0111\u1ec1u b\u1eaft \u0111\u1ea7u \u0111\u1ed3ng th\u1eddi<\/td>\n\u0110\u1ea1t<\/td>\n<\/tr>\n
                    Kh\u00f3a kho h\u00e0ng<\/td>\nTruy c\u1eadp \u0111\u1ed3ng th\u1eddi<\/td>\nCh\u1ec9 m\u1ed9t lu\u1ed3ng gi\u1eef kh\u00f3a<\/td>\n\u0110\u1ea1t<\/td>\n<\/tr>\n
                    N\u00fat h\u1ee3p nh\u1ea5t<\/td>\nHo\u00e0n t\u1ea5t<\/td>\n\u0110\u01a1n h\u00e0ng ch\u1ec9 \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn sau khi t\u1ea5t c\u1ea3 c\u00e1c ki\u1ec3m tra ho\u00e0n t\u1ea5t<\/td>\n\u0110\u1ea1t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                    B\u1ea3o tr\u00ec v\u00e0 ph\u00e1t tri\u1ec3n \ud83d\udcc8<\/h2>\n

                    C\u00e1c h\u1ec7 th\u1ed1ng ph\u1ea7n m\u1ec1m ph\u00e1t tri\u1ec3n theo th\u1eddi gian. C\u00e1c t\u00ednh n\u0103ng m\u1edbi \u0111\u01b0\u1ee3c th\u00eam v\u00e0o, v\u00e0 y\u00eau c\u1ea7u thay \u0111\u1ed5i. S\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng ph\u1ea3i \u0111\u01b0\u1ee3c b\u1ea3o tr\u00ec \u0111\u1ec3 ph\u1ea3n \u00e1nh nh\u1eefng thay \u0111\u1ed5i n\u00e0y. N\u1ebfu logic \u0111\u1ed3ng b\u1ed9 h\u00f3a thay \u0111\u1ed5i, s\u01a1 \u0111\u1ed3 c\u1ea7n \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt tr\u01b0\u1edbc ti\u00ean.<\/p>\n

                    Quy tr\u00ecnh qu\u1ea3n l\u00fd thay \u0111\u1ed5i<\/h3>\n
                      \n
                    • Ph\u00e2n t\u00edch t\u00e1c \u0111\u1ed9ng:<\/strong> Khi th\u00eam t\u00ednh n\u0103ng m\u1edbi, h\u00e3y ki\u1ec3m tra xem n\u00f3 c\u00f3 gi\u1edbi thi\u1ec7u t\u00e0i nguy\u00ean chung m\u1edbi hay kh\u00f4ng.<\/li>\n
                    • C\u1eadp nh\u1eadt s\u01a1 \u0111\u1ed3:<\/strong> S\u1eeda \u0111\u1ed5i s\u01a1 \u0111\u1ed3 UML \u0111\u1ec3 th\u1ec3 hi\u1ec7n lu\u1ed3ng m\u1edbi v\u00e0 c\u00e1c \u0111i\u1ec3m \u0111\u1ed3ng b\u1ed9 h\u00f3a.<\/li>\n
                    • Xem x\u00e9t m\u00e3 ngu\u1ed3n:<\/strong> C\u00e1c nh\u00e0 ki\u1ec3m tra xem x\u00e9t m\u00e3 ngu\u1ed3n d\u1ef1a tr\u00ean s\u01a1 \u0111\u1ed3 \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o vi\u1ec7c tri\u1ec3n khai ph\u00f9 h\u1ee3p v\u1edbi m\u00f4 h\u00ecnh.<\/li>\n<\/ul>\n

                      Quy tr\u00ecnh n\u00e0y ng\u0103n ng\u1eeba n\u1ee3 k\u1ef9 thu\u1eadt li\u00ean quan \u0111\u1ebfn \u0111\u1ed3ng th\u1eddi. C\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n th\u01b0\u1eddng t\u1ed1i \u01b0u cho t\u1ed1c \u0111\u1ed9 v\u00e0 qu\u00ean c\u1eadp nh\u1eadt logic \u0111\u1ed3ng b\u1ed9 h\u00f3a. M\u1ed9t m\u00f4 h\u00ecnh tr\u1ef1c quan \u0111\u00f3ng vai tr\u00f2 nh\u01b0 m\u1ed9t l\u1eddi nh\u1eafc nh\u1edf.<\/p>\n

                      L\u1ee3i \u00edch v\u1ec1 t\u00e0i li\u1ec7u<\/h3>\n

                      S\u01a1 \u0111\u1ed3 \u0111\u00f3ng vai tr\u00f2 l\u00e0 t\u00e0i li\u1ec7u s\u1ed1ng \u0111\u1ed9ng. N\u00f3 gi\u1ea3i th\u00edch “l\u00e0m th\u1ebf n\u00e0o<\/em>h\u1ec7 th\u1ed1ng x\u1eed l\u00fd \u0111\u1ed3ng th\u1eddi m\u00e0 kh\u00f4ng y\u00eau c\u1ea7u c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n ph\u1ea3i \u0111\u1ecdc c\u00e1c ch\u00fa th\u00edch m\u00e3 ngu\u1ed3n ph\u1ee9c t\u1ea1p.<\/p>\n

                        \n
                      • C\u00e1c th\u00e0nh vi\u00ean m\u1edbi trong nh\u00f3m c\u00f3 th\u1ec3 hi\u1ec3u lu\u1ed3ng nhanh ch\u00f3ng.<\/li>\n
                      • C\u00e1c ki\u1ec3m to\u00e1n vi\u00ean c\u00f3 th\u1ec3 x\u00e1c minh s\u1ef1 tu\u00e2n th\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n to\u00e0n v\u1eb9n d\u1eef li\u1ec7u.<\/li>\n
                      • C\u00e1c ki\u1ebfn tr\u00fac s\u01b0 c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n c\u00e1c \u0111i\u1ec3m ngh\u1ebdn trong lu\u1ed3ng \u0111i\u1ec1u khi\u1ec3n.<\/li>\n<\/ul>\n

                        Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn khi m\u00f4 h\u00ecnh h\u00f3a t\u00ednh \u0111\u1ed3ng th\u1eddi \ud83d\udeab<\/h2>\n

                        M\u1eb7c d\u00f9 s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng UML r\u1ea5t m\u1ea1nh m\u1ebd, nh\u01b0ng ch\u00fang kh\u00f4ng th\u1ec3 tr\u00e1nh kh\u1ecfi vi\u1ec7c b\u1ecb l\u1ea1m d\u1ee5ng. C\u00f3 nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn s\u1ef1 hi\u1ec3u l\u1ea7m th\u00eam ho\u1eb7c c\u00e1c v\u1ea5n \u0111\u1ec1 ch\u01b0a \u0111\u01b0\u1ee3c gi\u1ea3i quy\u1ebft.<\/p>\n

                        \u0110\u01a1n gi\u1ea3n h\u00f3a qu\u00e1 m\u1ee9c<\/h3>\n

                        Vi\u1ec7c m\u00f4 h\u00ecnh h\u00f3a t\u1eebng d\u00f2ng m\u00e3 ngu\u1ed3n l\u00e0 kh\u00f4ng c\u1ea7n thi\u1ebft v\u00e0 t\u1ea1o ra s\u1ef1 l\u1ed9n x\u1ed9n. H\u00e3y t\u1eadp trung v\u00e0o lu\u1ed3ng \u0111i\u1ec1u khi\u1ec3n v\u00e0 lu\u1ed3ng d\u1eef li\u1ec7u \u1edf c\u1ea5p \u0111\u1ed9 ki\u1ebfn tr\u00fac.<\/p>\n

                        B\u1ecf qua c\u00e1c t\u00ecnh tr\u1ea1ng k\u1eb9t ch\u1ebft<\/h3>\n

                        M\u1ed9t n\u00fat k\u1ebft h\u1ee3p kh\u00f4ng \u0111\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng kh\u00f4ng c\u00f3 k\u1eb9t ch\u1ebft. N\u1ebfu hai lu\u1ed3ng ch\u1edd nhau gi\u1ea3i ph\u00f3ng kh\u00f3a, h\u1ec7 th\u1ed1ng s\u1ebd b\u1ecb treo. S\u01a1 \u0111\u1ed3 ph\u1ea3i ch\u1ec9 ra c\u00e1c tr\u1ea1ng th\u00e1i ch\u1edd ti\u1ec1m \u1ea9n.<\/p>\n

                        Thi\u1ebfu lu\u1ed3ng \u0111\u1ed1i t\u01b0\u1ee3ng<\/h3>\n

                        Lu\u1ed3ng \u0111i\u1ec1u khi\u1ec3n th\u1ec3 hi\u1ec7n th\u1ee9 t\u1ef1 th\u1ef1c thi, nh\u01b0ng lu\u1ed3ng \u0111\u1ed1i t\u01b0\u1ee3ng th\u1ec3 hi\u1ec7n s\u1ef1 di chuy\u1ec3n d\u1eef li\u1ec7u. Vi\u1ec7c thi\u1ebfu lu\u1ed3ng \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 che gi\u1ea5u c\u00e1c ph\u1ee5 thu\u1ed9c d\u1eef li\u1ec7u g\u00e2y ra c\u00e1c t\u00ecnh tr\u1ea1ng c\u1ea1nh tranh.<\/p>\n

                        Gi\u1ea3 \u0111\u1ecbnh th\u1ef1c thi tu\u1ea7n t\u1ef1<\/h3>\n

                        Ch\u1ec9 v\u00ec c\u00e1c ho\u1ea1t \u0111\u1ed9ng \u0111\u01b0\u1ee3c v\u1ebd theo th\u1ee9 t\u1ef1 tu\u1ea7n t\u1ef1 kh\u00f4ng c\u00f3 ngh\u0129a l\u00e0 ch\u00fang th\u1ef1c thi tu\u1ea7n t\u1ef1. S\u01a1 \u0111\u1ed3 ph\u1ea3i hi\u1ec3n th\u1ecb r\u00f5 r\u00e0ng c\u00e1c n\u00fat chia v\u00e0 n\u00fat k\u1ebft h\u1ee3p \u0111\u1ec3 ch\u1ec9 ra t\u00ednh song song.<\/p>\n

                        T\u00f3m t\u1eaft nh\u1eefng \u0111i\u1ec3m ch\u00ednh c\u1ea7n l\u01b0u \u00fd \u2705<\/h2>\n

                        Vi\u1ec7c gi\u1ea3i quy\u1ebft c\u00e1c \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh \u0111\u00f2i h\u1ecfi s\u1ef1 chuy\u1ec3n d\u1ecbch t\u1eeb vi\u1ec7c g\u1ee1 l\u1ed7i sang thi\u1ebft k\u1ebf. B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng UML, c\u00e1c nh\u00f3m c\u00f3 th\u1ec3 tr\u1ef1c quan h\u00f3a c\u00e1c r\u1ee7i ro v\u1ec1 t\u00ednh \u0111\u1ed3ng th\u1eddi tr\u01b0\u1edbc khi ch\u00fang tr\u1edf th\u00e0nh v\u1ea5n \u0111\u1ec1 trong m\u00f4i tr\u01b0\u1eddng s\u1ea3n xu\u1ea5t.<\/p>\n

                          \n
                        • Tr\u1ef1c quan h\u00f3a tr\u01b0\u1edbc ti\u00ean:<\/strong>B\u1ea3n \u0111\u1ed3 h\u00f3a lu\u1ed3ng \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c \u0111\u01b0\u1eddng \u0111i song song.<\/li>\n
                        • X\u00e1c \u0111\u1ecbnh tr\u1ea1ng th\u00e1i chung:<\/strong>T\u00ecm c\u00e1c n\u00fat n\u01a1i nhi\u1ec1u lu\u1ed3ng truy c\u1eadp v\u00e0o c\u00f9ng m\u1ed9t d\u1eef li\u1ec7u.<\/li>\n
                        • M\u00f4 h\u00ecnh h\u00f3a \u0111\u1ed3ng b\u1ed9 h\u00f3a:<\/strong>S\u1eed d\u1ee5ng c\u00e1c n\u00fat chia v\u00e0 n\u00fat k\u1ebft h\u1ee3p \u0111\u1ec3 bi\u1ec3u di\u1ec5n c\u00e1c kh\u00f3a v\u00e0 r\u00e0o c\u1ea3n.<\/li>\n
                        • Ki\u1ec3m th\u1eed d\u1ef1a tr\u00ean m\u00f4 h\u00ecnh:<\/strong>\u0110\u1ea3m b\u1ea3o ph\u1ea7n tri\u1ec3n khai ph\u00f9 h\u1ee3p v\u1edbi s\u01a1 \u0111\u1ed3.<\/li>\n
                        • Duy tr\u00ec s\u01a1 \u0111\u1ed3:<\/strong>Gi\u1eef cho m\u00f4 h\u00ecnh \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt khi h\u1ec7 th\u1ed1ng ph\u00e1t tri\u1ec3n.<\/li>\n<\/ul>\n

                          Nghi\u00ean c\u1ee9u tr\u01b0\u1eddng h\u1ee3p \u0111\u00e3 ch\u1ee9ng minh r\u1eb1ng m\u1ed9t m\u00f4 h\u00ecnh r\u00f5 r\u00e0ng c\u00f3 th\u1ec3 l\u00e0m n\u1ed5i b\u1eadt c\u00e1c \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh \u1ea9n trong h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd t\u1ed3n kho. B\u1eb1ng c\u00e1ch \u0111\u01b0a v\u00e0o m\u1ed9t n\u00fat kh\u00f3a trong s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng, nh\u00f3m \u0111\u00e3 \u0111\u1ea3m b\u1ea3o c\u00e1c c\u1eadp nh\u1eadt t\u1ed3n kho l\u00e0 nguy\u00ean t\u1eed v\u00e0 nh\u1ea5t qu\u00e1n.<\/p>\n

                          Suy ngh\u0129 cu\u1ed1i c\u00f9ng v\u1ec1 t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a h\u1ec7 th\u1ed1ng \ud83c\udf1f<\/h2>\n

                          X\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng \u0111\u1ed3ng th\u1eddi \u0111\u00e1ng tin c\u1eady l\u00e0 m\u1ed9t l\u0129nh v\u1ef1c k\u1ebft h\u1ee3p gi\u1eefa l\u1eadp lu\u1eadn, m\u00f4 h\u00ecnh h\u00f3a v\u00e0 ki\u1ec3m th\u1eed. S\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng cung c\u1ea5p c\u1ea5u tr\u00fac c\u1ea7n thi\u1ebft \u0111\u1ec3 t\u1ed5 ch\u1ee9c c\u00e1c n\u1ed7 l\u1ef1c n\u00e0y. N\u00f3 bi\u1ebfn c\u00e1c kh\u00e1i ni\u1ec7m \u0111\u1ed3ng th\u1eddi tr\u1eebu t\u01b0\u1ee3ng th\u00e0nh c\u00e1c bi\u1ec3u di\u1ec5n tr\u1ef1c quan c\u1ee5 th\u1ec3.<\/p>\n

                          Khi c\u00e1c ki\u1ebfn tr\u00fac s\u01b0 \u01b0u ti\u00ean logic c\u1ee7a lu\u1ed3ng, h\u1ecd s\u1ebd gi\u1ea3m kh\u1ea3 n\u0103ng x\u1ea3y ra c\u00e1c \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh. C\u00e1ch ti\u1ebfp c\u1eadn n\u00e0y d\u1eabn \u0111\u1ebfn c\u00e1c h\u1ec7 th\u1ed1ng kh\u00f4ng ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng \u0111\u01b0\u1ee3c m\u00e0 c\u00f2n c\u00f3 th\u1ec3 d\u1ef1 \u0111o\u00e1n \u0111\u01b0\u1ee3c v\u00e0 d\u1ec5 b\u1ea3o tr\u00ec. Vi\u1ec7c \u0111\u1ea7u t\u01b0 v\u00e0o m\u00f4 h\u00ecnh h\u00f3a s\u1ebd mang l\u1ea1i l\u1ee3i \u00edch trong giai \u0111o\u1ea1n b\u1ea3o tr\u00ec, khi hi\u1ec3u \u0111\u01b0\u1ee3c m\u1ee5c \u0111\u00edch thi\u1ebft k\u1ebf ban \u0111\u1ea7u l\u00e0 \u0111i\u1ec1u then ch\u1ed1t.<\/p>\n

                          \u0110\u1ed1i v\u1edbi c\u00e1c \u0111\u1ed9i ng\u0169 mu\u1ed1n c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng x\u1eed l\u00fd \u0111\u1ed3ng th\u1eddi, b\u1eaft \u0111\u1ea7u b\u1eb1ng m\u00f4 h\u00ecnh l\u00e0 b\u01b0\u1edbc \u0111\u1ea7u ti\u00ean hi\u1ec7u qu\u1ea3 nh\u1ea5t. \u0110i\u1ec1u n\u00e0y t\u1ea1o n\u1ec1n t\u1ea3ng cho m\u00e3 ngu\u1ed3n v\u1eefng ch\u1eafc v\u00e0 c\u00e1c thao t\u00e1c \u1ed5n \u0111\u1ecbnh.<\/p>\n","protected":false},"excerpt":{"rendered":"

                          T\u00ednh \u0111\u1ed3ng th\u1eddi trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ea7n m\u1ec1m hi\u1ec7n \u0111\u1ea1i mang l\u1ea1i s\u1ef1 ph\u1ee9c t\u1ea1p \u0111\u00e1ng k\u1ec3. Khi nhi\u1ec1u lu\u1ed3ng ho\u1eb7c ti\u1ebfn tr\u00ecnh c\u00f9ng c\u1ed1 g\u1eafng truy c\u1eadp c\u00e1c…<\/p>\n","protected":false},"author":1,"featured_media":649,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"Gi\u1ea3i quy\u1ebft c\u00e1c \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh b\u1eb1ng s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng UML","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1ch ph\u00e1t hi\u1ec7n v\u00e0 kh\u1eafc ph\u1ee5c c\u00e1c \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh trong c\u00e1c h\u1ec7 th\u1ed1ng \u0111\u1ed3ng th\u1eddi b\u1eb1ng s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng UML. M\u1ed9t cu\u1ed9c kh\u1ea3o s\u00e1t k\u1ef9 thu\u1eadt s\u00e2u v\u1ec1 logic \u0111\u1ed3ng b\u1ed9 h\u00f3a v\u00e0 m\u00f4 h\u00ecnh h\u00f3a.","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[13],"tags":[39,44],"class_list":["post-648","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unified-modeling-language","tag-academic","tag-activity-diagram"],"yoast_head":"\nGi\u1ea3i quy\u1ebft c\u00e1c \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh b\u1eb1ng s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng UML<\/title>\n<meta name=\"description\" content=\"H\u1ecdc c\u00e1ch ph\u00e1t hi\u1ec7n v\u00e0 kh\u1eafc ph\u1ee5c c\u00e1c \u0111i\u1ec1u ki\u1ec7n c\u1ea1nh tranh trong c\u00e1c h\u1ec7 th\u1ed1ng \u0111\u1ed3ng th\u1eddi b\u1eb1ng s\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng UML. 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