“模”法无边—策略模式+简单工厂实现下机收费

2019-04-13 17:34发布

站内文章 / 模拟电子
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  下机收费是一种算法，临时用户和学生下机下机就是两种算法，让我想到了使用策略模式，根据是否为临时用户和学生，选择具体的算法，这属于简单工厂，好的，简单工厂+策略模式实现下机收费 策略类-封装具体的策略   '封装具体的算法，需要引用一个算法 Public Class consumeContext     Dim strategyconsume As Consume       Sub New(ByRef strategy As Consume)         Me.strategyconsume = strategy     End Sub       Public Function ContextInterface() As Double           Return strategyconsume.getConsume()     End Function   End Class 算法父类-提供可重写的方法和公共成员   Public Class Consume       Protected line As LineInfo     Protected consumemoney As Double     Protected chargestandard As ChargeStandardInfo     Protected count As Int16       Public Overridable Function getConsume() As Double       End Function End Class   算法A Public Class tempConsume       Inherits Consume       Sub New(ByRef line As LineInfo, ByRef chargestandard As ChargeStandardInfo)         Me.line = line           Me.chargestandard = chargestandard     End Sub       Public Overrides Function getConsume() As Double           If line.ConsumeTime Mod (Convert.ToInt16(chargestandard.UnitTime)) <> 0 Then             consumemoney = (line.ConsumeTime chargestandard.UnitTime + 1) * chargestandard.TempCharge         Else             consumemoney = (line.ConsumeTime chargestandard.UnitTime) * chargestandard.TempCharge         End If           Return consumemoney       End Function   End Class   算法B Public Class fixComsume       Inherits Consume       Sub New(ByRef line As LineInfo, ByRef chargestandard As ChargeStandardInfo)         Me.line = line           Me.chargestandard = chargestandard     End Sub       Public Overrides Function getConsume() As Double           If line.ConsumeTime Mod (Convert.ToInt16(chargestandard.UnitTime)) <> 0 Then             consumemoney = (line.ConsumeTime chargestandard.UnitTime + 1) * chargestandard.FixCharge         Else             consumemoney = (line.ConsumeTime chargestandard.UnitTime) * chargestandard.FixCharge         End If           Return consumemoney     End Function   End Class   客户端代码     ' 得到收费金额，虽然放在B层，但相当于客户端代码     Public Function getConsume(ByRef member As StudentInfo, ByRef line As LineInfo, ByRef chargestandard As ChargeStandardInfo) As Double           Select Case member.IsOnLine               Case "True"                   Dim stragey As New fixComsume(line, chargestandard)                   Dim cashcontext As New consumeContext(stragey)                   Return cashcontext.ContextInterface()               Case "False"                   Dim stragey As New tempConsume(line, chargestandard)                   Dim cashcontext As New consumeContext(stragey)                   Return cashcontext.ContextInterface()           End Select       End Function   End Class   设计模式在我看来是很高大上的东西，“只可远观不可亵玩”，这次在别的同学都用的情况下，自己也尝试使用了一下设计模式（虽然用的是最简单的），觉得设计模式也可以是很接地气的东西，大家，大胆的用啊！

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