Domain Logic Patterns

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Domain Logic Patterns
Class Fowler

• ??? ???? ??????...

???? ?? 031996275 ???? ???? 032185035
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Three Primary Layers

• Presentation
• Interacts with the user of the application
• eg rich client, HTML browser, web service
• Domain
• Business rules, validations, calculations
• Data Source
• Connects to the rest of the enterprise
  environment
• Persistence RDBMs
• Messaging, TP monitors, legacy apps.

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Domain ??????
4
???????? ?? ???????? ?????

• ?????? ????? ??????
• ???? ??
• ???????? ????? ???????? ???? ????????? ????
  ??????????
• ?????? ???????? ?????
• ???????? ????? ??????

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????? ?????

• Transaction Script
• Domain Model
• Table Module
• Service Layer

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Transaction Script

• ????? ?? ??????? ?????? ?"? ????????? ???? ??
  ???????? ????? ????? ?????? ????? ?????.
• ??????? ????? ???? ???? ?????????.
• ???? ???? ???? ?????? ??? ?? ????? ????? ???? ??
  ?????.
• ??????? ????? ???? ????? ?????.
• ????? ?????? ???? ?????????? ?? ?????? ?????
  ?????.

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Transaction Script

• ???????
• ???? ?????
• ??? ???? ??? ?????????
• ?? ??????? ??????? ?? ???? ????
• ???????
• ???? ??????? ?????? ??? ????? ??? ??? ???????
• ?? ????? ??????? ??? ??????

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????? ????? ????? ??????

• ?????? ????? ?? ????? ?????? ???? ????? ???
  ?????? ?????? ??"? ?????????? ????? (??????
  ??...)
• ????? 3 ??????
• Word Processor WP
• ?? ????? ???? ???? ?????
• Spread Sheet SS
• 1/3 ???? ???? ????? 1/3 ???? 60 ??? ?- 1/3 ????
  90 ???
• Database DB
• 1/3 ???? ???? ????? 1/3 ???? 30 ??? ?- 1/3 ????
  60 ???

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???? ??????
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????? ????? ?????? Transaction Script

• ???? 2 ?????? ??????? ????? Transaction Script
• ????? ???? ????? ????? ??????? ??"? ??????
• calculateRevenueRecognitions(contractID)
• ????? ????? ????? ???? ?????? ?? ?????? ?????.
• RecognizedRevenue(contractID,date)

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Transaction Script
12
????? Transaction Script

• ????? ??????? ?????? ????? ???????????.
• ????? ?????????? ????? ?????? ????? ?????.
• ???? ????? ??????
• ?????? ???? ????????? ???? ??????? ??????

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Domain Model

• ???? ?????? ?? ??????? ?????
• ??????? ????? ??????? ?????????? ??????? ??????.
• ?? ??????? ????? ???? ?? ???? ??????
• ???? ?????
• ???? ?????
• ???? ?????? ???? ?? ?????????? ??????? ?????????
  ????

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Domain Model

• ???????
• ????? ??????? ?? ?????? ????? ??????
• ????? ?? ??????? ?????????? (?????? ???????)
  ????? ?????
• ????? ???? ??????? (????? ?? ???????)
• scalability
• ???????
• ????? ???????? ??????? ???? ????? ???? ??????
  ????? ?? ?? ?-instances ???????
• ???? ?????? ???????? ??????
• ????? ??????? ????? ??????? ???? ????? ?????
  ?????

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????? ????? ?????? Domain Module

• ???? 2 ?????? ??????? ????? Domain Module
• ????? ???? ????? ????? ??????? ??"? ??????
• contract.calculateRecognitions ()
• ????? ????? ????? ???? ?????? ?? ?????? ?????
• Contract.recognizedReveneu (date)

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Domain Model class diagram
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Domain Model Sequence
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Class RevenueRecognition.

• private Money amount
• private MfDate date
• public RevenueRecognition(Money amount, MfDate
  date)
• this.amountamount
• this.datedate
• public Money getAmount() return amount
• Public boolean isRecognizableBy (MdDate asOf)
• return asOf.after(date) asOf.equals(date)

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Strategy classes

• Abstract Class RecoginitionStrategy
• abstract void calculateRevenueRecognitions
  (Contract contract)

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class CompleteRecoginitionStrategy

• public void calculateRevenueRecognitions
  (Contract contract)
• contract.addRevenueRecognition (new
  RevenueRecognition(contract.getRevenue() contrac
  t.getWhenSigned()))

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class ThreeWayRecoginitionStrategy

• private int firstRecognitionOffset
• private int secondRecognitionOffset
• public ThreeWayRecoginitionStategy (int
  firstRecognitionOffset,
• int secondRecognitionOffset)
• this.firstRecognitionOffset
  firstRecognitionOffset
• this.secondRecognitionOffset
  secondRecognitionOffset

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class ThreeWayRecoginitionStrategy ..cont

• void calculateRevenueRecognitions (Contract
  contract)
• Money allocation contract.getRevenue().alloca
  te(3)
• contract.addRevenueRecognition (new
  RevenueRecognition(allocation0,
• contract.getWhenSigned()))
• contract.addRevenueRecognition (new
  RevenueRecognition(allocation0,
• contract.getWhenSigned().addDays(firstRecogniti
  onOffset)))
• contract.addRevenueRecognition (new
  RevenueRecognition(allocation0,
• contract.getWhenSigned().addDays(secondRecognit
  ionOffset)))

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class Product

• private String name
• private RecognitionStrategy recognitionStrategy
• public Product(String name, RecognitionStrategy
  recognitionStrategy)
• this.name name
• this.recognitionStrategy recognitionStrategy
• public static Product newWordProcessor (String
  name)
• return new Product(name, new CompleteRecognitionS
  trategy())

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class Productcont

• public static Product newSpreadsheet (String
  name)
• return new Product(name, new ThreeWayRecognitionS
  trategy(60, 90))
• public static Product newDatabase (String name)
• return new Product(name, new ThreeWayRecognitionS
  trategy(30, 60))
• Public void calculateRevenueRecognitions
  (Contract contract)
• recognitionStrategy.calculateRevenueRecognition(c
  ontract)

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Class Contract

• private Product product
• private Money revenue
• private MfDate whenSigned
• private Long id
• private List revenueRecognitions new
  ArrayList()
• public addRevenueRecognition (RevenueRecognition
  rr)
• revenueRecognitions.add(rr)

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class Contractcont

• public Contract (Product product, Money revenue,
  MfDate whenSigned)
• this.product product
• this.revenue revenue
• this.whenSigned whenSigned
• public void calculateRecognitions ()
• product.calculateRevenueRecognitions(this)

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class Contractcont

• public Money recognizedReveneu (MfDate asOf)
• Money result Money.dollars(0)
• Itrator it revenueRecognitions.itrator()
• While (it.hasNext())
• RevenueRecognition r (RevenueRecognition)
  it.next()
• if (r.isRecognizableBy(asOf))
• result result.add(r.getAmount())
• return result

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Domain Model Sequence
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????? ???????? ????

• class DelayedRecoginitionStrategy
• private MfDate date
• public void calculateRevenueRecognitions
  (Contract contract)
• date contract.getWhenSigned()month.add(1)
• contract.addRevenueRecognition (new
  RevenueRecognition(contract.getRevenue()
  ,date))

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????? Product ???

• Class Product
• public static Product newEditor (String name)
• return new Product(name, new DelayedRecoginitionS
  trategy())

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????? ???? ????? ????

• public Product editorProduct. newEditor(word2000
  )
• public Contract cnew
• Contract (editor, amount, 21/3/75)

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????? Domain Module

• ??????? ????? ??????? ?????????? ??????? ??????.
• ????? ??????? ?? ?????? ????? ??????
• ????? ?? ??????? ?????????? (?????? ???????)
  ????? ?????
• ????? ??????? ????? ??????? ???? ????? ????? ?????

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Table Module

• Instance ???? ????? ?? ??????? ????? ???? ?? ????
• ???? ?? ???? ????? ????? ??? ?????? ???? Instance
  ????
• ???? ?????? ?-Domain Module ???
• ??? ???? ??????? Instance
• ??????? ???? ???? ??? ???????

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Table Module

• ?? ????? ????? ???? ???? ???? ?? ??? ????? ?????
  ?????
• ?? ???? OO ??????? ??? ?????? ?-.net ??????
• ?? ?????? ????? ?? ???? ??????? ????? ???? ??-
  Domain Module ?? ???? ???? ????? ???? ???????.

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Table Module

• ???????
• ??? ?? ?????? ? DB.
• ???? ??? ?????? ??????? PLSQL??? ???? ??????
  ???????.
• ????? ????? ?? ???? ?????? ???????? ????? ????,
  ???? VB ???????? ??? ?? ?????? RS.

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Table Module

• ???????
• ???? ???? ????? OO.
• ??????????? ???? ???? ??? ????? ??.
• ??? ???? ??????? ???????.
• ???? ?? ????? ??????.
• ???? ????? ????? ?? ???? ???????.

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Table Module
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Table Module Sequence
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Table Module - Example

• ????? ?????? ?? ????? ??????
• ????? ????????? ?? Table Module
• class Table Module
• protected DataTable table
• protected TableModule (DataSet ds, String
  tableName)
• table ds.TablestableName

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Table Module - Example

• ????? ??? ????? ?constructor ?? ? superclass ??
  ?? ????? ??????
• Class contract
• public Contract (DataSet ds) base (ds,
  contracts)
• ????? ????? Table module ??? ?????, ?"? ?????
  Data Set ? constractor.
• Contract new contract (dataset)

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Class Contract

• ??????? ?????? ???? ??????? contract ??? ????
  ??? ??????? ??? ???? ? Domain Module - ???? ??
  ?????.
• Public void CalculateRecognition (long
  contractID)
• If (prod.GetProductType(prodID)
  productType.wp)
• ..
• else if (prod.GetProductType(prodID)
  productType.ss)

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Table Module - Example

• ????? ?? ??????? ???????? ?????? ?????, ?????
  ??????? ??????? RevenueRecognition ????? ?? ????
  ????? ??????.
• ????? ? Domain Module, ?? ?????? ????? ????????
  Contract.

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????? Table Module

• ??????? ????? ???? ????????? ?????? ??????.
• ???? ??????? ???? ?? ???? ???????
• ????? ??????? ????? ??????? ???? ????
• ???? ?????? OO ???????

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???????? ?? ???????? ?????

• ????? ???????
• ?????? ????? ??????
• ???? ??
• ???????? ????? ???????? ???? ????????? ????
  ??????????
• ?????? ???????? ?????
• ???????? ????? ??????

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Service Layer

• ????? ???? ?? ? Business logic ???? ?????
• Domain logic ???? ????? ???? ?????? ?? ?
  business ???? ????????? ?????? ??????.
• Application logic ???? ??????? ?? ?????? ????
  ???? ????? ?????, ????????? ?? ?????? ????? ?????
  ????? ?????
• ???? ???????? Application logic ???????Workflow
  ??????? ???? ?????? ??????

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Service Layer
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Service Layer

• ?? ????? ?????? ? Application logic ??? ???????
  ?? Domain Model ? Table Module
• ??????? ???? ?????? ?????? ???? ?? ?? ?????
  Application logic ?????
• ????? ???? ??????? Service Layer ?????? ?? ????
  Domain Logic
• ?"? ?? ????? ?????? ??????? ?? ?-Domain Logic ????

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?????
49
?????

• ????? 3 ????? ???? ?? ???? ??????? ??????
• ???? ??????????? Transaction Script Module
• ???? ?????? ????? Domain Module
• ???? ??????? Table Module
• ???????? ???????? ?????? ??? ??????
• ??????? ???????
• ?????? ?????? ??????
• ????? ????? ?????? ?? ??????? ????? ???? ?????
  ????? ?-Service Layer