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java.lang.Object
   |
   +----edu.utah.janos.nodeos.InChannel

Summary

public final class  InChannel
     extends java.lang.Object
{
          // Fields 6
     private final DemultiplexKey classifier;
     private static final Vector classifierTable;
     private final DeliverFunc deliverFunc;
     public static final byte[] exitPacket;
     final Flow flow;
     private final ThreadPool threadPool;

          // Constructors 1
     public InChannel(Flow, DemultiplexKey, ThreadPool, DeliverFunc);

          // Methods 9
     private static synchronized void addClassifier(InChannel);
     static boolean demultiplex(UdpBuffer);
     public static void msgLoop(Address) throws IOException;
     public static void msgLoop(int) throws IOException;
     private static synchronized void remClassifier(InChannel);

     void destroy();
     protected void finalize();
     boolean scheduleDelivery(Buffer, int, int, int);
     public String toString();

          // Inner Classes 1
     private static class InChannel.PacketClassifierInfo
}

Java wrapper for an InChannel.

Implemented on top of UDP for the moment.

Author:

Janos Ministry of Development

See Also: CutThroughChannel, OutChannel

Cross Reference

Returned By:

UdpTest.makeInChannel()

   public static final byte[] exitPacket

Death Packet. XXX.

   private static final Vector classifierTable

This is a kernel-global variable. It maps Demultiplex keys to InChannels. XXX global variable

   final Flow flow

The flow this receive channel is associated with.

   private final DemultiplexKey classifier

The demultiplex key associated with this channel.

   private final ThreadPool threadPool

The ThreadPool to send incoming packets to. ThreadPool.addWork() had best be protected kernel code (i.e., final).

   private final DeliverFunc deliverFunc

The callback for delivery.

Constructors

· InChannel

Summary  |  Top

   public InChannel(Flow flow, 
                    DemultiplexKey classifier, 
                    ThreadPool threadPool, 
                    DeliverFunc deliverFunc) 

   private static synchronized void addClassifier(InChannel newChan) 

   private static synchronized void remClassifier(InChannel deadChan) 

   public static void msgLoop(Address localAddr)  throws IOException

XXX

See Also: msgLoop

   public static void msgLoop(int recvPort)  throws IOException

This must be run before any Channel objects are created.

XXX: shouldn't really be public

   static boolean demultiplex(UdpBuffer b) 

I sure hope this gets better

XXX I broke this. The return value is true if the packet was dispatched *and* the target had enough resources to handle the packet. It returns false if the packet wasn't matched *or* it was matched but the target didn't have enough resources.

   boolean scheduleDelivery(Buffer b, 
                            int packetStart, 
                            int packetLength, 
                            int payloadStart) 

Schedule the given buffer b for delivery to this InChannel. A BufferHandle wrapping the packet is set up (from packetStart to packetLength). The payloadStart parameter is just a *hint* passed to the delivery function. To be meaningful, it should be relative to the packetStart.

Called by demultiplex (above) and by InChannelHandle.push().

Returns:

true if the buffer was scheduled, false if the target had insuffient resources.

   public String toString() 

Overrides:

toString in class Object

   void destroy() 

   protected void finalize() 

Overrides:

finalize in class Object

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