ePOST API

rice.pastry
Class PastryNodeFactory

java.lang.Object
  extended by rice.pastry.PastryNodeFactory
Direct Known Subclasses:
DirectPastryNodeFactory, DistPastryNodeFactory

public abstract class PastryNodeFactory
extends java.lang.Object

The interface to an object which can construct PastryNodes.

Version:
$Id: PastryNodeFactory.java 2904 2006-01-10 21:50:37Z jeffh $
Author:
Andrew Ladd, Alan Mislove, Merziyah Poonawala, Abhishek Ray

Field Summary
protected  Environment environment
           
protected  Logger logger
           
protected  int lSetSize
           
protected  java.util.Hashtable pingCache
          Hashtable which keeps track of temporary ping values, which are only used during the getNearest() method
protected  int rtBase
           
protected  int rtMax
           
 
Constructor Summary
PastryNodeFactory(Environment env)
           
 
Method Summary
 Environment getEnvironment()
           
abstract  LeafSet getLeafSet(NodeHandle handle)
          This method returns the remote leafset of the provided handle to the caller, in a protocol-dependent fashion.
abstract  CancellableTask getLeafSet(NodeHandle handle, Continuation c)
          Non-blocking version.
 NodeHandle getNearest(NodeHandle local, NodeHandle seed)
          This method implements the algorithm in the Pastry locality paper for finding a close node the the current node through iterative leafset and route row requests.
abstract  int getProximity(NodeHandle local, NodeHandle handle)
          This method determines and returns the proximity of the current local node the provided NodeHandle.
abstract  RouteSet[] getRouteRow(NodeHandle handle, int row)
          This method returns the remote route row of the provided handle to the caller, in a protocol-dependent fashion.
abstract  CancellableTask getRouteRow(NodeHandle handle, int row, Continuation c)
          Non-blocking version.
abstract  PastryNode newNode(NodeHandle bootstrap)
          Call this to construct a new node of the type chosen by the factory.
abstract  PastryNode newNode(NodeHandle bootstrap, NodeId nodeId)
          Call this to construct a new node of the type chosen by the factory, with the given nodeId.
protected  int proximity(NodeHandle local, NodeHandle handle)
          Method which checks to see if we have a cached value of the remote ping, and if not, initiates a ping and then caches the value
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

rtMax

protected final int rtMax

lSetSize

protected final int lSetSize

rtBase

protected final int rtBase

pingCache

protected java.util.Hashtable pingCache
Hashtable which keeps track of temporary ping values, which are only used during the getNearest() method


environment

protected Environment environment

logger

protected Logger logger
Constructor Detail

PastryNodeFactory

public PastryNodeFactory(Environment env)
Method Detail

newNode

public abstract PastryNode newNode(NodeHandle bootstrap)
Call this to construct a new node of the type chosen by the factory.

Parameters:
bootstrap - The node handle to bootstrap off of

newNode

public abstract PastryNode newNode(NodeHandle bootstrap,
                                   NodeId nodeId)
Call this to construct a new node of the type chosen by the factory, with the given nodeId.

Parameters:
bootstrap - The node handle to bootstrap off of
nodeId - The nodeId of the new node

getLeafSet

public abstract LeafSet getLeafSet(NodeHandle handle)
                            throws java.io.IOException
This method returns the remote leafset of the provided handle to the caller, in a protocol-dependent fashion. Note that this method may block while sending the message across the wire.

Parameters:
handle - The node to connect to
Returns:
The leafset of the remote node
Throws:
java.io.IOException

getLeafSet

public abstract CancellableTask getLeafSet(NodeHandle handle,
                                           Continuation c)
Non-blocking version.

Parameters:
handle -
c -
Returns:
Throws:
java.io.IOException

getRouteRow

public abstract RouteSet[] getRouteRow(NodeHandle handle,
                                       int row)
                                throws java.io.IOException
This method returns the remote route row of the provided handle to the caller, in a protocol-dependent fashion. Note that this method may block while sending the message across the wire.

Parameters:
handle - The node to connect to
row - The row number to retrieve
Returns:
The route row of the remote node
Throws:
java.io.IOException

getRouteRow

public abstract CancellableTask getRouteRow(NodeHandle handle,
                                            int row,
                                            Continuation c)
Non-blocking version.

Parameters:
handle -
row -
c -
Returns:
Throws:
java.io.IOException

getProximity

public abstract int getProximity(NodeHandle local,
                                 NodeHandle handle)
This method determines and returns the proximity of the current local node the provided NodeHandle. This will need to be done in a protocol- dependent fashion and may need to be done in a special way.

Parameters:
handle - The handle to determine the proximity of
Returns:
The proximity of the provided handle

getEnvironment

public Environment getEnvironment()

proximity

protected int proximity(NodeHandle local,
                        NodeHandle handle)
Method which checks to see if we have a cached value of the remote ping, and if not, initiates a ping and then caches the value

Parameters:
handle - The handle to ping
Returns:
The proximity of the handle

getNearest

public NodeHandle getNearest(NodeHandle local,
                             NodeHandle seed)
This method implements the algorithm in the Pastry locality paper for finding a close node the the current node through iterative leafset and route row requests. The seed node provided is any node in the network which is a member of the pastry ring. This algorithm is designed to work in a protocol-independent manner, using the getResponse(Message) method provided by subclasses.

Parameters:
seed - Any member of the pastry ring
Returns:
A node suitable to boot off of (which is close the this node)

ePOST API

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