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java.lang.Object
   |
   +----edu.utah.janos.nodeos.pj_ProtocolLayer.PacketHandler
           |
           +----edu.utah.janos.nodeos.pj_InChannelDispatcher

Summary

class  pj_InChannelDispatcher
     extends edu.utah.janos.nodeos.pj_ProtocolLayer.PacketHandler
{
          // Fields 3
     private final Vector channels;
     private static final Hashtable dispatchers;
     private pj_ProtocolLayer protocolLayer;

          // Constructors 1
     public pj_InChannelDispatcher();

          // Methods 4
     static pj_InChannelDispatcher getDispatcher(pj_ProtocolLayer, pj_ProtocolLayer.PacketAddressMask) throws IOException;

     void addChannel(pj_InChannel);
     boolean handle(pj_BufferHandle);
     void remChannel(pj_InChannel);
}

Class that is used to dispatch packets from protocol layers to the appropriate InChannel.

Author:

Janos Ministry of Development

Cross Reference

Returned By:

pj_InChannelDispatcher.getDispatcher()

   private static final Hashtable dispatchers

The set of dispatchers for the system.

XXX global state?

   private pj_ProtocolLayer protocolLayer

The protocol layer that this dispatcher is attached to

   private final Vector channels

The set of channels that this handler can dispatch too. We only really care about their demultiplex keys since the rest of the demultiplex is done elsewhere.

Constructors

· pj_InChannelDispatcher

Summary  |  Top

   public pj_InChannelDispatcher() 

Default constructor

   static pj_InChannelDispatcher getDispatcher(pj_ProtocolLayer pl, 
                                               pj_ProtocolLayer.PacketAddressMask source)  throws IOException

Get the dispatcher that matches the given source mask.

Parameter	Description
pl	The protocol layer were packets are coming from
source	The source address mask packets are matched too

   void addChannel(pj_InChannel newChan) 

Add a channel to this dispatcher. The channel is placed in the selection line by how large its key is, the larger the key the earlier it will be checked.

   void remChannel(pj_InChannel deadChan) 

Remove a channel from this dispatcher.

   boolean handle(pj_BufferHandle pb) 

Handle a packet that came in through the transport layer. Returns true if the packet was handled.

The buffer is handled only if an InChannel can be found and that InChannel has buffers available to swap with.

Parameter	Description
pb	The system's receive pj_BufferHandle

Returns:

the input pb, perhaps with a different underlying buffer

Overrides:

handle in class pj_ProtocolLayer.PacketHandler

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