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## rice.pastry.routing
Class RouteSet

    java.lang.Object
      java.util.Observable
          rice.pastry.routing.RouteSet

All Implemented Interfaces:
  NodeHandleSet, NodeSetI, java.util.Observer, java.io.Serializable

public class RouteSet
extends java.util.Observable
implements NodeSetI, java.io.Serializable, java.util.Observer

A set of nodes typically stored in the routing table. The set contains a bounded number of the closest node handles. Since proximity value can change unpredictably, we don't keep the set in sorted order.

Version:
  $Id: RouteSet.java,v 1.26 2005/06/07 22:02:13 jeffh Exp $
Author:
  Andrew Ladd, Peter Druschel
See Also:
  Serialized Form

Constructor Summary
`RouteSet(int maxSize)` Constructor.

Method Summary
`NodeHandle` | `closestNode()` Return the closest live node in the set.
`NodeHandle` | `closestNode(int minLiveness)` Return the closest live node in the set.
`NodeHandle` | `get(int i)` Returns the node in the ith position in the set.
`NodeHandle` | `get(NodeId nid)` Returns the node handle with the matching node id or null if none exists.
`NodeHandle` | `getHandle(Id id)` Finds the NodeHandle associated with the NodeId.
`NodeHandle` | `getHandle(int i)` Gets the ith element in the set.
`int` | `getIndex(NodeHandle nh)` Get the index of the node id.
`int` | `getIndex(NodeId nid)` Get the index of the node id.
`int` | `getIndexHandle(Id id)` Gets the index of the element with the given node id.
`boolean` | `member(NodeHandle nh)` Membership test.
`boolean` | `member(NodeId nid)` Membership test.
`boolean` | `memberHandle(Id id)` Verifies if the set contains this particular id.
`void` | `pingAllNew()` Pings all new nodes in the RouteSet.
`boolean` | `put(NodeHandle handle)` Puts a node into the set.
`boolean` | `putHandle(NodeHandle handle)` Puts a NodeHandle into the set.
`NodeHandle` | `remove(NodeHandle nh)` Removes a node from a set.
`NodeHandle` | `remove(NodeId nid)` Removes a node from a set.
`NodeHandle` | `removeHandle(Id id)` Removes a node id and its handle from the set.
`int` | `size()` Return the current size of the set.
`void` | `update(java.util.Observable o, java.lang.Object arg)` Is called by the Observer pattern whenever the liveness or proximity of a registered node handle is changed.

Methods inherited from class java.util.Observable
`addObserver, clearChanged, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers, setChanged`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### RouteSet

    public RouteSet(int maxSize)

  Constructor.

Parameters:
  `maxSize` - the maximum number of nodes that fit in this set.

Method Detail

### get

    public NodeHandle get(int i)

  Returns the node in the ith position in the set.

  Specified by:
    `get` in interface `NodeSetI`
  Parameters:
    `i` - DESCRIBE THE PARAMETER
  Returns:
    the ith node.

### get

    public NodeHandle get(NodeId nid)

  Returns the node handle with the matching node id or null if none exists.

  Specified by:
    `get` in interface `NodeSetI`
  Parameters:
    `nid` - the node id.
  Returns:
    the node handle.

### getIndex

    public int getIndex(NodeId nid)

  Get the index of the node id.

  Specified by:
    `getIndex` in interface `NodeSetI`
  Parameters:
    `nid` - DESCRIBE THE PARAMETER
  Returns:
    the node.

### getIndex

    public int getIndex(NodeHandle nh)

  Get the index of the node id.

  Specified by:
    `getIndex` in interface `NodeSetI`
  Parameters:
    `nh` - DESCRIBE THE PARAMETER
  Returns:
    the node.

### getHandle

    public NodeHandle getHandle(Id id)

  Finds the NodeHandle associated with the NodeId.

  Specified by:
    `getHandle` in interface `NodeHandleSet`
  Parameters:
    `id` - a node id.
  Returns:
    the handle associated with that id or null if no such handle is found.

### getHandle

    public NodeHandle getHandle(int i)

  Gets the ith element in the set.

  Specified by:
    `getHandle` in interface `NodeHandleSet`
  Parameters:
    `i` - an index.
  Returns:
    the handle associated with that id or null if no such handle is found.

### getIndexHandle

    public int getIndexHandle(Id id)
                       throws java.util.NoSuchElementException

  Gets the index of the element with the given node id.

  Specified by:
    `getIndexHandle` in interface `NodeHandleSet`
  Parameters:
    `id` - the id.
  Returns:
    the index or throws a NoSuchElementException.
  Throws:
    `java.util.NoSuchElementException` - DESCRIBE THE EXCEPTION

### put

    public boolean put(NodeHandle handle)

  Puts a node into the set. The insertion succeeds either if the set is below is maximal size or if the handle is closer than the most distant member in the set.

  Specified by:
    `put` in interface `NodeSetI`
  Parameters:
    `handle` - the handle to put.
  Returns:
    true if the put succeeded, false otherwise.

### update

    public void update(java.util.Observable o,
                       java.lang.Object arg)

  Is called by the Observer pattern whenever the liveness or proximity of a registered node handle is changed.

  Specified by:
    `update` in interface `java.util.Observer`
  Parameters:
    `o` - The node handle
    `arg` - the event type (PROXIMITY_CHANGE, DECLARED_LIVE, DECLARED_DEAD)

### remove

    public NodeHandle remove(NodeId nid)

  Removes a node from a set.

  Parameters:
    `nid` - the node id to remove.
  Returns:
    the removed handle or null.

### remove

    public NodeHandle remove(NodeHandle nh)

  Removes a node from a set.

  Specified by:
    `remove` in interface `NodeSetI`
  Parameters:
    `nh` - DESCRIBE THE PARAMETER
  Returns:
    the removed handle or null.

### member

    public boolean member(NodeHandle nh)

  Membership test.

  Specified by:
    `member` in interface `NodeSetI`
  Parameters:
    `nh` - DESCRIBE THE PARAMETER
  Returns:
    true if it is a member, false otherwise.

### member

    public boolean member(NodeId nid)

  Membership test.

  Parameters:
    `nid` - the node id to membership of.
  Returns:
    true if it is a member, false otherwise.

### size

    public int size()

  Return the current size of the set.

  Specified by:
    `size` in interface `NodeSetI`
  Returns:
    the size.

### pingAllNew

    public void pingAllNew()

  Pings all new nodes in the RouteSet. No longer- Called from RouteMaintenance.

### closestNode

    public NodeHandle closestNode()

  Return the closest live node in the set.

  Returns:
    the closest node, or null if no live node exists in the set.

### closestNode

    public NodeHandle closestNode(int minLiveness)

  Return the closest live node in the set.

  Parameters:
    `minLiveness` - DESCRIBE THE PARAMETER
  Returns:
    the closest node, or null if no live node exists in the set.

### putHandle

    public boolean putHandle(NodeHandle handle)

  Puts a NodeHandle into the set.

  Specified by:
    `putHandle` in interface `NodeHandleSet`
  Parameters:
    `handle` - the handle to put.
  Returns:
    true if the put succeeded, false otherwise.

### memberHandle

    public boolean memberHandle(Id id)

  Verifies if the set contains this particular id.

  Specified by:
    `memberHandle` in interface `NodeHandleSet`
  Parameters:
    `id` - a node id.
  Returns:
    true if that node id is in the set, false otherwise.

### removeHandle

    public NodeHandle removeHandle(Id id)

  Removes a node id and its handle from the set.

  Specified by:
    `removeHandle` in interface `NodeHandleSet`
  Parameters:
    `id` - DESCRIBE THE PARAMETER
  Returns:
    the node handle removed or null if nothing.

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