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117 lines
4.2 KiB
117 lines
4.2 KiB
Imports System.Threading
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Imports Microsoft.VisualBasic.Net
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Imports Microsoft.VisualBasic.Parallel.Tasks
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Namespace TaskHost
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Public Class LinqPool : Implements IDisposable
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''' <summary>
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''' linq池
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''' </summary>
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ReadOnly __linq As New Dictionary(Of String, LinqProvider)
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ReadOnly __openQuerys As New TaskQueue(Of IPEndPoint)
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Public Function GetLinq(uid As String) As LinqProvider
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Return __linq(uid)
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End Function
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''' <summary>
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''' uid参数是Linq Portal的Tostring函数的结果
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''' </summary>
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''' <param name="uid"></param>
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Public Sub Free(uid As String)
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If Not __linq.ContainsKey(uid) Then Return
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Dim x As LinqProvider = __linq(uid)
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Call x.Free ' 释放Linq数据源的指针
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SyncLock __linq
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Call __linq.Remove(uid) ' 从哈希表之中移除数据源释放服务器资源
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End SyncLock
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End Sub
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''' <summary>
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'''
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''' </summary>
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''' <param name="source"></param>
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''' <param name="type">
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''' 这里应该是集合的类型，函数会自动从这个类型信息之中得到元素的类型；
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''' 假若函数获取得到集合之中的元素的类型失败的话，则会直接使用所传入的类型参数作为集合之中的元素类型
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''' </param>
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''' <returns></returns>
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Public Function OpenQuery(source As IEnumerable, type As Type) As IPEndPoint
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Dim elType As Type = type.GetTypeElement(True)
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If elType Is Nothing Then
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elType = type
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End If
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Dim task As New __openTask(__linq) With {
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.elType = elType,
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.source = source
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}
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Return __openQuerys.Join(AddressOf task.OpenQuery)
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End Function
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Private Class __openTask
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ReadOnly __linq As Dictionary(Of String, LinqProvider)
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Public source As IEnumerable
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Public elType As Type
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Sub New(ByRef linq As Dictionary(Of String, LinqProvider))
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__linq = linq
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End Sub
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Public Function OpenQuery() As IPEndPoint
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Dim linq As New LinqProvider(source, elType) ' 创建 Linq 数据源
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Dim portal As IPEndPoint = linq.Portal
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Dim uid As String = portal.ToString
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Call __linq.Add(portal.ToString, linq) ' 数据源添加入哈希表之中
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Return portal
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End Function
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End Class
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#Region "IDisposable Support"
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Private disposedValue As Boolean ' To detect redundant calls
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' IDisposable
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Protected Overridable Sub Dispose(disposing As Boolean)
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If Not Me.disposedValue Then
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If disposing Then
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' TODO: dispose managed state (managed objects).
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For Each x In __linq
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Call Free(x.Key)
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Next
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Call __linq.Free
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End If
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' TODO: free unmanaged resources (unmanaged objects) and override Finalize() below.
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' TODO: set large fields to null.
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End If
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Me.disposedValue = True
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End Sub
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' TODO: override Finalize() only if Dispose(disposing As Boolean) above has code to free unmanaged resources.
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'Protected Overrides Sub Finalize()
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' ' Do not change this code. Put cleanup code in Dispose(disposing As Boolean) above.
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' Dispose(False)
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' MyBase.Finalize()
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'End Sub
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' This code added by Visual Basic to correctly implement the disposable pattern.
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Public Sub Dispose() Implements IDisposable.Dispose
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' Do not change this code. Put cleanup code in Dispose(disposing As Boolean) above.
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Dispose(True)
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' TODO: uncomment the following line if Finalize() is overridden above.
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' GC.SuppressFinalize(Me)
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End Sub
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#End Region
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End Class
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End Namespace |