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packetmanager.monkey
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packetmanager.monkey
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Strict
Public
' Imports (Public):
Import packet
' Imports (Private):
Private
Import brl.pool
Import brl.socket
Import brl.databuffer
'Import brl.datastream
Public
' This handles the storage of 'Packet' objects,
' as well as their "transmission states".
Class PacketManager Extends Pool<Packet>
' Constant variable(s):
' Defaults:
Const Default_PacketSize:= 1024 ' 4096
Const Defaulk_PacketPoolSize:= 4 ' 8 ' 16
' Constructor(s):
Method New(PacketSize:Int=Default_PacketSize, InitialCapacity:Int=Defaulk_PacketPoolSize)
Construct()
Self.PacketSize = PacketSize
GenerateInitialPackets(InitialCapacity)
End
Method Construct:Void()
InTransit = New Stack<Packet>()
Pool = New Stack<T>()
Return
End
' Constructor(s) (Protected):
Protected
Method GenerateInitialPackets:Void(InitialCapacity:Int)
For Local I:= 1 To InitialCapacity
Pool.Push(GeneratePacket())
Next
Return
End
Public
' Desturctor(s):
' Calling this method is considered unsafe.
' Use with caution, or not at all.
Method Discard:Void()
For Local P:= Eachin InTransit
Free(FinishTransmission(P))
Next
InTransit.Clear()
Return
End
' Methods (Public):
Method AllocatePacket:Packet()
If (Pool.IsEmpty) Then
Return GeneratePacket()
Endif
Return Pool.Pop()
End
' This resets a 'Packet', allowing it to be used again via 'Allocate'.
' If 'P' is 'Null', this will do nothing.
Method Free:Void(P:Packet)
If (P = Null) Then
Return
Endif
P.Reset()
Pool.Push(P)
Return
End
' This marks a 'Packet' as currently "in transit".
' This means the 'Data' property of 'P' is in use by 'brl.socket'.
Method MarkTransmission:Void(P:Packet)
InTransit.Push(P)
Return
End
' This removes the "transmission state" from 'P'.
' After calling this, it's a good idea to call 'Free' on this 'Packet'.
' The return-value is 'P' if the operation was successful.
Method FinishTransmission:Packet(P:Packet)
InTransit.RemoveEach(P)
Return P
End
' This calls the main overload with the result of 'GetTransmission'.
' If the 'CanDiscardData' argument is enabled, 'Buffer' may
' be freed if we couldn't find an associated 'Packet'.
' The return-value is the 'Packet' found, if any.
Method FinishTransmission:Packet(Buffer:DataBuffer, CanDiscardData:Bool)
Local P:= GetTransmission(Buffer, CanDiscardData)
If (P = Null) Then
Return Null
Endif
FinishTransmission(P)
Return P
End
' This retrieves a 'Packet' that is "in transit", using its 'DataBuffer' as an identifier.
' If a 'Packet' could not be found, 'Null' is returned.
Method GetTransmission:Packet(Buffer:DataBuffer, CanDiscard:Bool)
For Local P:= Eachin InTransit
If (P.Data = Buffer) Then
Return P
Endif
Next
If (CanDiscard) Then
Buffer.Discard()
Return Null
Endif
Return Null
End
' Macros:
#Rem
This command relinquishes control over 'P', as well as its storage.
This is useful for ending a controlled pattern,
like 'AcceptMessagesWith' in the 'NetworkManager' class.
#End
Method KillTransmission:Bool(S:Socket, P:Packet)
Return KillTransmission(P)
End
Method KillTransmission:Bool(P:Packet)
Local Output:= FinishTransmission(P)
If (Output <> Null) Then
Free(Output)
Return True
Endif
' Return the default response.
Return False
End
Method KillTransmission:Bool(Data:DataBuffer, CanDiscard:Bool)
Local P:= FinishTransmission(Data, CanDiscard)
If (P <> Null) Then
Free(P)
Return True
Endif
' Return the default response.
Return False
End
' Methods (Protected):
Protected
Method GeneratePacket:Packet()
Return New Packet(PacketSize)
End
Public
' Properties (Public):
' This holds handles to 'Packet' objects that are in transit.
' For details, see 'MarkTransmission' above.
Method InTransit:Stack<Packet>() Property
Return Self._InTransit
End
Method PacketSize:Int() Property
Return Self._PacketSize
End
' Properties (Protected):
Protected
Method InTransit:Void(Input:Stack<Packet>) Property
Self._InTransit = Input
Return
End
Method Pool:Stack<Packet>() Property
Return Self._Pool
End
Method Pool:Void(Input:Stack<Packet>) Property
Self._Pool = Input
Return
End
Method PacketSize:Void(Input:Int) Property
Self._PacketSize = Input
Return
End
Public
' Fields (Public):
' Nothing so far.
' Fields (Protected):
Protected
Field _InTransit:Stack<Packet>
Field _Pool:Stack<Packet>
Field _PacketSize:Int
Public
End