{"id":6131,"date":"2020-12-06T21:19:19","date_gmt":"2020-12-06T21:19:19","guid":{"rendered":"https:\/\/bentego.com\/pegada-declare-expression\/"},"modified":"2025-10-20T16:09:35","modified_gmt":"2025-10-20T16:09:35","slug":"pegada-declare-expression","status":"publish","type":"post","link":"https:\/\/bentego.com\/tr\/pegada-declare-expression\/","title":{"rendered":"Pega’da Declare Expression"},"content":{"rendered":"

[fusion_builder_container type=”flex” hundred_percent=”no” equal_height_columns=”no” menu_anchor=”” hide_on_mobile=”small-visibility,medium-visibility,large-visibility” class=”” id=”” background_color=”” background_image=”” background_position=”center center” background_repeat=”no-repeat” fade=”no” background_parallax=”none” parallax_speed=”0.3″ video_mp4=”” video_webm=”” video_ogv=”” video_url=”” video_aspect_ratio=”16:9″ video_loop=”yes” video_mute=”yes” overlay_color=”” video_preview_image=”” border_color=”” border_style=”solid” padding_top=”” padding_bottom=”” padding_left=”” padding_right=””][fusion_builder_row][fusion_builder_column type=”1_1″ layout=”1_1″ background_position=”left top” background_color=”” border_color=”” border_style=”solid” border_position=”all” spacing=”yes” background_image=”” background_repeat=”no-repeat” padding_top=”” padding_right=”” padding_bottom=”” padding_left=”” margin_top=”0px” margin_bottom=”0px” class=”” id=”” animation_type=”” animation_speed=”0.3″ animation_direction=”left” hide_on_mobile=”small-visibility,medium-visibility,large-visibility” center_content=”no” last=”true” min_height=”” hover_type=”none” link=”” border_sizes_top=”” border_sizes_bottom=”” border_sizes_left=”” border_sizes_right=”” first=”true”][fusion_text]<\/p>\n\n

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

 <\/p>\n\n

Merhaba, bu yaz\u0131mda Pega\u2019da otomatik hesaplamalar yapmak i\u00e7in kullan\u0131lan \u2018Declare Expression\u2019\u0131 ve bu hesaplamalar\u0131 yaparken hangi y\u00f6ntemlerin izlenebilece\u011fini anlataca\u011f\u0131m.<\/p>\n\n

 <\/p>\n\n

Declare Expression<\/strong>, expressions\u2019lara dayal\u0131 olarak property de\u011ferlerinin otomatik olarak hesaplanmas\u0131 i\u00e7in kullan\u0131lmaktad\u0131r. Ancak basit expressions\u2019lardan ziyade; sabit i\u00e7eren syntax, function \u00e7a\u011fr\u0131lar\u0131, operat\u00f6rler ve property referanslar\u0131 gibi bir\u00e7ok ek durumlarda ba\u015fvurulmaktad\u0131r.<\/p>\n\n

 <\/p>\n\n

Declare Expression rule\u2019lar\u0131 2 y\u00f6nteme g\u00f6re tetiklenmektedir:<\/p>\n\n

 <\/p>\n\n

1.Forward Chaining<\/p>\n\n

 <\/p>\n\n

2.Backward Chaining<\/p>\n\n

 <\/p>\n\n

Forward Chaining: <\/strong>Bir property de\u011ferindeki de\u011fi\u015fikliklerin di\u011fer taget property\u2019ler \u00fczerine otomatik olarak yay\u0131larak hesaplanmas\u0131n\u0131 sa\u011flayan yap\u0131d\u0131r. Default olarak expression\u2019lar Forward chaining ile \u00e7al\u0131\u015fmaktad\u0131r.<\/p>\n\n

 <\/p>\n\n

Backward Chaining: <\/strong>Girdiler de\u011fi\u015fti\u011finde de\u011fil, bir property i\u00e7in bir de\u011fer gerekti\u011finde kullan\u0131lan yap\u0131d\u0131r.<\/p>\n\n

 <\/p>\n\n

Declare Expression olu\u015ftururken, \u2018Change Tracking\u2019 sekmesinden manuel olarak farkl\u0131 hesaplama metotlar\u0131 kullan\u0131larak forward veya backward chaining se\u00e7ilebilmektedir.<\/p>\n\n

 <\/p>\n\n

Metotlar ve hangi chaining yap\u0131s\u0131na ait olduklar\u0131 \u015fu \u015fekildedir:<\/p>\n\n

\"\"<\/p>\n\n

 <\/p>\n\n

Whenever input changes: <\/strong>Forward chaining tipindedir. Source property her de\u011fi\u015fti\u011finde target property de\u011feri de de\u011fi\u015fmektedir.<\/p>\n\n

 <\/p>\n\n

When used, if property is missing: <\/strong>Backward chaining tipindedir. Target property yaln\u0131zca sistem clipboard\u2019da property\u2019nin eksik oldu\u011funu tespit etti\u011finde hesaplanacakt\u0131r.<\/p>\n\n

 <\/p>\n\n

When used, if no value present: <\/strong>Backward chaining tipindedir. De\u011fer s\u0131f\u0131r, null, bo\u015f veya sayfada hen\u00fcz g\u00f6r\u00fcnmedi\u011finde hesapla yap\u0131l\u0131r ve hesaplama yap\u0131ld\u0131ktan sonra giri\u015f de\u011fi\u015fse bile tekrar \u00e7al\u0131\u015fmayacakt\u0131r.<\/p>\n\n

 <\/p>\n\n

Whenever used: <\/strong>Backward chaining tipindedir. Sistem, giri\u015f de\u011fi\u015fmemi\u015f olsa bile target property de\u011ferini yeniden hesaplayan herhangi bir rule\u2019da target property\u2019ye ba\u015fvuruldu\u011funda hesaplamalar\u0131 \u00e7al\u0131\u015ft\u0131r\u0131r.<\/p>\n\n

 <\/p>\n\n

When applied by a rule collection: <\/strong>Backward chaining tipindedir. Sistem, bir property\u2019nin de\u011ferini yaln\u0131zca s\u00f6z konusu \u00f6zelli\u011fe Collection Rule taraf\u0131ndan ba\u015fvuruluyorsa hesaplama yapar.<\/p>\n\n

 <\/p>\n\n

When invoked procedurally: <\/strong>Backward chaining tipindedir. Target property yaln\u0131zca ba\u011f\u0131ms\u0131z bir Collection Rule, target property\u2019yi \u00e7a\u011f\u0131rd\u0131\u011f\u0131nda hesaplan\u0131r. Bu da bir Collection Rule\u2019da bu ifade prosed\u00fcrel olarak \u00e7a\u011fr\u0131l\u0131rsa chained ifadenin \u00e7al\u0131\u015fmayaca\u011f\u0131 anlam\u0131na gelmektedir.<\/p>\n\n

 <\/p>\n\n

Hesaplamalar yap\u0131l\u0131rken hangi chaining yap\u0131s\u0131n\u0131n se\u00e7ilmesi gerekti\u011fi, de\u011ferlerin de\u011fi\u015fme s\u0131kl\u0131klar\u0131 ve kullan\u0131mlar\u0131na ba\u011fl\u0131 olarak de\u011fi\u015febilmektedir.<\/p>\n\n

 <\/p>\n\n

\u00d6rnek olarak X = Y + Z \u015feklindeki bir toplama ifadesinde hem forward hem de backward chaining kullan\u0131labilir.<\/p>\n\n

 <\/p>\n\n

Y ve Z de\u011ferleri s\u0131k s\u0131k de\u011fi\u015fiyorsa ve X de\u011feri sonraki ad\u0131mlarda birka\u00e7 yerde kullan\u0131l\u0131yorsa Backward Chaining se\u00e7ilmesi daha kullan\u0131\u015fl\u0131d\u0131r.<\/p>\n\n

 <\/p>\n\n

E\u011fer girdi de\u011ferleri (Y,Z) s\u0131k de\u011fi\u015fmiyorsa ve target property (A) uygulamada s\u0131k kullan\u0131l\u0131yorsa da Forward Chaining daha kullan\u0131\u015fl\u0131 olacakt\u0131r.<\/p>\n\n

 <\/p>\n\n

Uygulama \u00dczerinde Forward ve Backward Chaining<\/strong><\/p>\n\n

 <\/p>\n\n

Forward ve Backward Chaining\u2019in bir arada kullan\u0131ld\u0131\u011f\u0131 ve de\u011ferlerin a\u015fa\u011f\u0131daki gibi oldu\u011fu bir uygulamaya g\u00f6z atal\u0131m.<\/p>\n\n

 <\/p>\n\n

    \n
  1. Total price = Quantity * Price<\/li>\n<\/ol>\n\n

     <\/p>\n\n

    \u00a0 \u00a0\u00a0Grand total = Total price + Packaging Charge<\/p>\n\n

     <\/p>\n\n

    2. Click Create >> Decision >> DeclareExpression yolunu izleyerek target property\u2019si Total Price olan Declare Expression\u2019\u0131 olu\u015ftural\u0131m.<\/p>\n\n\n\n

    <\/figure>\n

    \"\"<\/p>\n\n

     <\/p>\n\n

    3. Expressions sekmesinde ifade giri\u015flerini yapal\u0131m.<\/p>\n\n

     <\/p>\n\n

    \"\"\"\"<\/figure>\n\n

     <\/p>\n\n

    4. Change Tracking sekmesinde Forward Chaining tetiklenmesi i\u00e7in \u2018Whenever inputs change\u2019i se\u00e7elim.<\/p>\n\n

     <\/p>\n\n

    \"\"\"\"<\/figure>\n\n

     <\/p>\n\n

    5. Expression\u2019\u0131 save ederek, ayn\u0131 i\u015flemleri -Backward Chaining tetiklenmesi i\u00e7in Change Tracking sekmesinde \u2018Whenever used\u2019 kullanarak- Grand Total target property\u2019sine de uygulayarak case\u2019i save and run edelim.<\/p>\n\n

     <\/p>\n\n

    6. Price ve Quantity de\u011ferleri de\u011fi\u015fti\u011finde otomatik olarak Total Price de\u011ferinin de de\u011fi\u015fti\u011fini g\u00f6r\u00fcyoruz. Forward chaining\u2019in i\u015fleyi\u015fini g\u00f6rmek i\u00e7in Submit etmiyoruz.<\/p>\n\n

     <\/p>\n\n

    \"\"\"\"<\/figure>\n\n

     <\/p>\n\n

    7. Clipboard\u2019u a\u00e7arak PyWorkPage sayfas\u0131nda TotalPrice ve GrandTotal propertyleri\u2019nin de\u011ferlerini kontrol edelim.<\/p>\n\n

     <\/p>\n\n

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

    \"\"<\/p>\n

    \"\"\"\"<\/p>\n\n

     <\/p>\n\n

    TotalPrice de\u011ferinin hesapland\u0131\u011f\u0131n\u0131 ancak GrandTotal de\u011ferinin gerekli de\u011ferler mevcut oldu\u011fu halde tabloda olmad\u0131\u011f\u0131n\u0131 g\u00f6r\u00fcyoruz. Bunun sebebi GrandTotal\u2019in sadece property\u2019ye ba\u015fvuruldu\u011funda tetiklenmesidir (backward chaining).<\/p>\n\n

     <\/p>\n\n

    8. GrandTotal de\u011ferinin hesaplanmas\u0131 i\u00e7in Submit ederek tetiklenmesini sa\u011flar\u0131z. Bu sayede Submit edildikten sonra UI’da ve Clipboard\u2019da GrandTotal de\u011ferinin listelendi\u011fini g\u00f6rebiliriz.<\/p>\n\n\n\n

    \"\"<\/p>\n\n

    \"\"<\/figure>\n\n\n\n

    Forward ve Backward Chaining Aras\u0131ndaki Farklar<\/strong><\/p>\n\n

     <\/p>\n\n

    \n
    \n
    \n
    \n

    Forward Chaining<\/strong><\/p>\n\n\n\n

    1) Hesaplama; \u00e7a\u011fr\u0131lan property\u2019nin uygulamada herhangi bir yerde referans verilip verilmedi\u011fine bak\u0131lmaks\u0131z\u0131n yap\u0131lacakt\u0131r.<\/p>\n\n\n\n

    2) Sistemin kullan\u0131l\u0131p kullan\u0131lmad\u0131\u011f\u0131na bak\u0131lmaks\u0131z\u0131n hesaplamaya devam edilmesi gerekti\u011finden y\u00fcksek performans gerektirir.<\/p>\n\n\n\n

    3) Basit hesaplamalar ve kullan\u0131c\u0131n\u0131n daha az s\u0131kl\u0131kta de\u011fer de\u011fi\u015ftirdi\u011fi durumlarda kullan\u0131labilir.<\/p>\n\n\n\n

    Backward Chaining<\/strong><\/p>\n\n\n\n

    1) Hesaplama; rule veya decision table\u2019da, UI\u2019da veya uygulaman\u0131n herhangi bir yerinde property\u2019ye ba\u015fvuruldu\u011funda yap\u0131lmaktad\u0131r.<\/p>\n\n\n\n

    2) Gerekli olmayan hesaplamalar\u0131 yapmak i\u00e7in kaynaklar\u0131 kullanmak yerine; sistemden her kullan\u0131ld\u0131\u011f\u0131nda hesaplama yapmas\u0131 istenece\u011finden daha performans odakl\u0131d\u0131r.<\/p>\n\n\n\n

    3) Karma\u015f\u0131k hesaplamalarda ve birden fazla durum s\u00f6z konusu oldu\u011funda kullanmak daha uygundur.<\/p>\n\n\n\n

    Sonu\u00e7<\/strong><\/p>\n\n\n\n

    Declare Expression kullan\u0131m\u0131;<\/p>\n\n\n\n

    -Gerekli olan verileri dinamik olarak alma,<\/p>\n\n\n\n

    -Karma\u015f\u0131k prosed\u00fcr mant\u0131\u011f\u0131 ve manuel i\u015fleme ihtiyac\u0131n\u0131 azaltma,<\/p>\n\n\n\n

    -Karma\u015f\u0131k s\u00fcre\u00e7lerin otomatikle\u015ftirilmesini sa\u011flayarak kolayla\u015ft\u0131rma,<\/p>\n\n\n\n

    -BPM ve BRM \u00e7\u00f6z\u00fcmleri i\u00e7in zaman ve maliyet tasarrufu sa\u011flama,<\/p>\n\n\n\n

    -Declarative processing i\u00e7in gerekli olan yetenekleri sa\u011flama gibi bir\u00e7ok konuda avantaj sa\u011flamaktad\u0131r.<\/p>\n\n\n\n

    Zaman ay\u0131rd\u0131\u011f\u0131n\u0131z ve okudu\u011funuz i\u00e7in te\u015fekk\u00fcrler, bir sonraki yaz\u0131mda g\u00f6r\u00fc\u015fmek dile\u011fiyle\u2026<\/p>\n<\/div>\n<\/div>\n\n\n\n

    Referanslar<\/strong><\/p>\n\n\n\n

    https:\/\/www.linkedin.com\/pulse\/forward-chaining-backward-pega-shailendra-sankhala<\/a><\/p>\n\n\n\n

    https:\/\/www.pegaforengineers.com\/post\/declare-expression<\/a><\/p>\n\n\n\n

    https:\/\/community.pega.com\/sites\/default\/files\/help_v722\/rule-\/rule-declare-\/rule-declare-expressions\/main.htm<\/a><\/p>\n\n\n\n

    https:\/\/pegalive.wordpress.com\/tag\/declarative-rules\/<\/a><\/p>\n\n\n\n

    https:\/\/collaborate.pega.com\/question\/backward-chaining-vs-forward-chaining<\/a><\/p>\n<\/div>\n<\/div>\n\n

    [\/fusion_text][\/fusion_builder_column][\/fusion_builder_row][\/fusion_builder_container]<\/p>","protected":false},"excerpt":{"rendered":"

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