''' <summary>
''' 生产统计类（当前类线程仅限同步中使用）
''' </summary>
Public Class Statistics
    ''' <summary>
    ''' 校验总数,包含有效校验与无效检验
    ''' </summary>
    Private _checkCount As Integer

    ''' <summary>
    ''' 检验有效总数中无效总数
    ''' </summary>
    Private _invalidCount As Integer

    ''' <summary>
    ''' 检验总数中有效总数
    ''' </summary>
    Private _validCount As Integer

    ''' <summary>
    ''' 检验有效总数中失败总数
    ''' </summary>
    Private _failCount As Integer
    ''' <summary>
    ''' 检验有效总数中通过总数
    ''' </summary>
    Private _passCount As Integer

    ''' <summary>
    ''' 产品运行时良品率,通过总数除以有效总数
    ''' </summary>
    Private _yield As Double

    Private ReadOnly _observerList As List(Of IStatisticsObserver)

    Sub New()
        _checkCount = 0
        _failCount = 0
        _passCount = 0

        _observerList = New List(Of IStatisticsObserver)()
    End Sub

    Public ReadOnly Property CheckCount() As Integer
        Get
            Return _checkCount
        End Get
    End Property

    Public ReadOnly Property InvalidCount() As Integer
        Get
            Return _invalidCount
        End Get
    End Property


    Public ReadOnly Property FailCount() As Integer
        Get
            Return _failCount
        End Get
    End Property

    Public ReadOnly Property PassCount() As Integer
        Get
            Return _passCount
        End Get
    End Property




    Public Sub AddFailCount()
        _failCount += 1
        UpdateFailCount(_failCount)

        _validCount +=1
        UpdateValidCount(_validCount)
        
        _checkCount += 1
        UpdateSumCount(_checkCount)


        _yield = (_passCount / _validCount) * 100
        UpdateYield(_yield)
    End Sub

    Public Sub AddPassCount()
        _passCount += 1
        UpdatePassCount(_passCount)

        _validCount +=1
        UpdateValidCount(_validCount)

        _checkCount += 1
        UpdateSumCount(_checkCount)

        _yield = (_passCount / _validCount) * 100
        UpdateYield(_yield)
    End Sub

    Public Sub AddInvalidCount()
        _invalidCount += 1
        UpdateInvalidCount(_invalidCount)

        _checkCount += 1
        UpdateSumCount(_checkCount)
    End Sub


    Public Sub AddStatisticsObserver(observer As IStatisticsObserver)
        _observerList.Add(observer)
    End Sub

    Public Sub RemoveStatisticsObserver(observer As IStatisticsObserver)
        _observerList.Remove(observer)
    End Sub

    Public Sub ClearStatisticsObserver()
        _observerList.Clear()
    End Sub


    Private Sub UpdateFailCount(count As Integer)
        For Each observer As IStatisticsObserver In _observerList
            observer.UpdateFailCount(count)
        Next
    End Sub

    Private Sub UpdatePassCount(count As Integer)
        For Each observer As IStatisticsObserver In _observerList
            observer.UpdatePassCount(count)
        Next
    End Sub


    Private Sub UpdateValidCount(count As Integer)
        For Each observer As IStatisticsObserver In _observerList
            observer.UpdateValidCount(count)
        Next
    End Sub

    Private Sub UpdateInvalidCount(count As Integer)
        For Each observer As IStatisticsObserver In _observerList
            observer.UpdateInvalidCount(count)
        Next
    End Sub


    Private Sub UpdateSumCount(count As Integer)
        For Each observer As IStatisticsObserver In _observerList
            observer.UpdateSumCount(count)
        Next
    End Sub

    Private Sub UpdateYield(yield As Double)
        For Each observer As IStatisticsObserver In _observerList
            observer.UpdateYield(yield)
        Next
    End Sub

End Class