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java.lang.Object
   |
   +----edu.utah.janos.route.RouteTable
           |
           +----edu.utah.janos.route.WriteableRouteTable
                   |
                   +----edu.utah.janos.antsr.route.DynamicRouteTable

Summary

public class  DynamicRouteTable
     extends edu.utah.janos.route.WriteableRouteTable
     implements edu.utah.janos.antsr.core.RouteTable
{
          // Fields 3
     public static final int INFINITY;
     private final Hashtable gateways;
     private final Hashtable gcPool;

          // Constructors 1
     public DynamicRouteTable();

          // Methods 11
     public void addRoute(RouteEntry);
     public void addRoute(int, int, String) throws NoSuchNodeAddress, AddressFormatException;
     public void configure(int, boolean, String) throws IOException, AddressFormatException, NoSuchNodeAddress;
     Hashtable gcPool();
     public Enumeration getGateways();
     public Enumeration getNeighbors();
     public RouteEntry getRoute(int);
     public RouteEntry getRoute(Integer);
     public boolean isGateway(int);
     public int neighborCount();
     public void removeRoute(RouteEntry);
}

The ANTSR DynamicRouteTable contains all of the state and code for maintaining a dynamic routing table. This includes sending out periodic updates, sending out immediate updates, (and receiving both). GC'ing stale routes, etc.

I think there are some problems in here for a node that has more than one physical address. It will probably send the wrong info out to the other nodes...

Based very strongly on the dynamic route table from the original MIT ANTS. I renamed and moved a lot of things around, but I (hopefully) didn't change the update algorithm.

XXX access control issues.

Fields

· INFINITY

Summary  |  Top

   public static final int INFINITY

Maximum cost of travelling to a node. Dunno why 16 is a good number.

   private final Hashtable gcPool

GC pool; unavailable for retrieving routes from.

DynamicRouteEntries are added to the GC pool when they "expire". Later, they will be deleted from the GC pool, for good. DynamicRouteEntries might get "resuscitated" from the pool.

Maps Integer() wrapped destintion addresses to RouteEntries. XXX this is actually another RouteTable instance...

   private final Hashtable gateways

Gateways: hardwired connections to other networks. This map contains *only* immediate neighbors, but can be changed if new neighbors are found or if neighbors expire.

Maps Integer() wrapped destintion addresses to DynamicRouteEntries. XXX this is actually another RouteTable instance...

Only really used in the sendRouteMessages() function.

See Also: sendRouteMessages

Constructors

· DynamicRouteTable

Summary  |  Top

   public DynamicRouteTable() 

   public void configure(int nodeAddr, 
                         boolean doUpdates, 
                         String configFile)  throws IOException, AddressFormatException, NoSuchNodeAddress

XXX one-time function.

Implements:

configure in interface RouteTable

   public RouteEntry getRoute(int activeDest) 

Retrive the current route to get to the given active address.

Overrides:

getRoute in class WriteableRouteTable

Implements:

getRoute in interface RouteTable

   public RouteEntry getRoute(Integer activeDest) 

Overrides:

getRoute in class WriteableRouteTable

   Hashtable gcPool() 

   public Enumeration getNeighbors() 

Overrides:

getNeighbors in class RouteTable

Implements:

getNeighbors in interface RouteTable

   public Enumeration getGateways() 

   public boolean isGateway(int addr) 

   public int neighborCount() 

Overrides:

neighborCount in class RouteTable

Implements:

neighborCount in interface RouteTable

   public void addRoute(int activeDest, 
                        int activeNext, 
                        String physNext)  throws NoSuchNodeAddress, AddressFormatException

Add a route to the table.

XXX this is only invoked by RouteTableReader. Don't call internally...

Overrides:

addRoute in class WriteableRouteTable

   public void addRoute(RouteEntry re) 

Add a route to the table. If it is a neighbor, add it to the gateways

Overrides:

addRoute in class WriteableRouteTable

   public void removeRoute(RouteEntry re) 

Remove a route from the table. If it is a neighbor, then drop it from the gateways table

Overrides:

removeRoute in class WriteableRouteTable

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