rice.pastry.leafset
Class SimilarSet

java.lang.Object
  java.util.Observable
      rice.pastry.leafset.SimilarSet

All Implemented Interfaces:

java.io.Serializable, NodeSetEventSource

public class SimilarSet
extends java.util.Observable
implements NodeSetEventSource, java.io.Serializable

A set of nodes, ordered by numerical distance of their Id from the local Id

Version:

$Id: SimilarSet.java 4654 2009-01-08 16:33:07Z jeffh $

Author:

Andrew Ladd, Peter Druschel

See Also:

Serialized Form

Constructor Summary

SimilarSet(LeafSet leafSet, NodeHandle localNode, int size, boolean cw)
Constructor.

SimilarSet(LeafSet leafSet, NodeHandle localNode, int size, boolean cw, NodeHandle[] handles)

Method Summary

void	addNodeSetListener(NodeSetListener listener)
void	addObserver(java.util.Observer o) Deprecated. use addNodeSetListener
void	deleteObserver(java.util.Observer o) Deprecated. use removeNodeSetListener
void	destroy()
NodeHandle	get(Id nid) Finds the NodeHandle associated with the Id.
NodeHandle	get(int i) Gets the ith element in the set.
NodeHandle	get(NodeHandle nh)
java.util.Collection<NodeHandle>	getCollection() This is thread safe, in that it won't throw an error if not properly synchronized.
NodeHandle	getHandle(int i) Gets the ith element in the set.
int	getIndex(Id nid) Gets the index of the element with the given node id.
int	getIndex(NodeHandle nh)
int	getIndexHandle(Id id) Gets the index of the element with the given node id.
boolean	member(Id nid)
boolean	member(NodeHandle nid) Verifies if the set contains this particular id.
boolean	memberHandle(Id id) Verifies if the set contains this particular id.
int	mostSimilar(Id nid) Impl that doesn't produce garbage Numerically closest node to a given a node.
protected void	notifyListeners(NodeHandle handle, boolean added)
boolean	put(NodeHandle handle) Puts a NodeHandle into the set.
boolean	put(NodeHandle handle, boolean suppressNotify)
boolean	putHandle(NodeHandle handle) Puts a NodeHandle into the set.
NodeHandle	remove(Id nid) Removes a node id and its handle from the set.
protected NodeHandle	remove(int i) Removes a node id and its handle from the set.
NodeHandle	remove(NodeHandle nh)
NodeHandle	removeHandle(Id id) Removes a node id and its handle from the set.
void	removeNodeSetListener(NodeSetListener listener)
int	size() Gets the current size of this set.
protected void	swap(int i, int j) swap two elements
boolean	test(NodeHandle handle) Test if a NodeHandle belongs into the set.
java.lang.String	toString()

Methods inherited from class java.util.Observable

clearChanged, countObservers, deleteObservers, hasChanged, notifyObservers, notifyObservers, setChanged

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

SimilarSet

public SimilarSet(LeafSet leafSet,
                  NodeHandle localNode,
                  int size,
                  boolean cw)

Constructor.

Parameters:

localNode - the local node

size - the size of the similar set.

cw - true if this is the clockwise leafset half

SimilarSet

public SimilarSet(LeafSet leafSet,
                  NodeHandle localNode,
                  int size,
                  boolean cw,
                  NodeHandle[] handles)

Method Detail

swap

protected void swap(int i,
                    int j)

swap two elements

Parameters:

i - the index of the first element

j - the indes of the second element

test

public boolean test(NodeHandle handle)

Test if a NodeHandle belongs into the set. Predicts if a put would succeed.

Parameters:

handle - the handle to test.

Returns:

true if a put would succeed, false otherwise.

put

public boolean put(NodeHandle handle)

Puts a NodeHandle into the set.

Parameters:

handle - the handle to put.

Returns:

true if the put succeeded, false otherwise.

put

public boolean put(NodeHandle handle,
                   boolean suppressNotify)

addObserver

public void addObserver(java.util.Observer o)

Deprecated. use addNodeSetListener

Generates too many objects to use this interface

Overrides:

addObserver in class java.util.Observable

deleteObserver

public void deleteObserver(java.util.Observer o)

Deprecated. use removeNodeSetListener

Generates too many objects to use this interface

Overrides:

deleteObserver in class java.util.Observable

addNodeSetListener

public void addNodeSetListener(NodeSetListener listener)

Specified by:

addNodeSetListener in interface NodeSetEventSource

removeNodeSetListener

public void removeNodeSetListener(NodeSetListener listener)

Specified by:

removeNodeSetListener in interface NodeSetEventSource

notifyListeners

protected void notifyListeners(NodeHandle handle,
                               boolean added)

get

public NodeHandle get(Id nid)

Finds the NodeHandle associated with the Id.

Parameters:

nid - a node id.

Returns:

the handle associated with that id or null if no such handle is found.

get

public NodeHandle get(NodeHandle nh)

get

public NodeHandle get(int i)

Gets the ith element in the set.

Parameters:

i - an index. i == -1 refers to the local node

Returns:

the handle associated with that id or null if no such handle is found.

member

public boolean member(NodeHandle nid)

Verifies if the set contains this particular id.

Parameters:

nid - a node id.

Returns:

true if that node id is in the set, false otherwise.

member

public boolean member(Id nid)

remove

public NodeHandle remove(Id nid)

Removes a node id and its handle from the set.

Parameters:

nid - the node to remove.

Returns:

the node handle removed or null if nothing.

remove

public NodeHandle remove(NodeHandle nh)

remove

protected NodeHandle remove(int i)

Removes a node id and its handle from the set.

Parameters:

i - the index of the node to remove.

Returns:

the node handle removed or null if nothing.

getIndex

public int getIndex(Id nid)

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

Parameters:

nid - the node id.

Returns:

the index or -1 if the element does not exist.

getIndex

public int getIndex(NodeHandle nh)

size

public int size()

Gets the current size of this set.

Returns:

the size.

mostSimilar

public int mostSimilar(Id nid)

Impl that doesn't produce garbage Numerically closest node to a given a node. Returns -1 if the local Id is the most similar and returns an index otherwise.

Parameters:

nid - a node id.

Returns:

-1 if the local Id is most similar, else the index of the most similar node.

putHandle

public boolean putHandle(NodeHandle handle)

Puts a NodeHandle into the set.

Parameters:

handle - the handle to put.

Returns:

true if the put succeeded, false otherwise.

getHandle

public NodeHandle getHandle(int i)

Gets the ith element in the set.

Parameters:

i - an index.

Returns:

the handle associated with that id or null if no such handle is found.

memberHandle

public boolean memberHandle(Id id)

Verifies if the set contains this particular id.

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.

Parameters:

nid - the node to remove.

Returns:

the node handle removed or null if nothing.

getIndexHandle

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

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

Parameters:

id - the id.

Returns:

the index or throws a NoSuchElementException.

Throws:

java.util.NoSuchElementException

getCollection

public java.util.Collection<NodeHandle> getCollection()

This is thread safe, in that it won't throw an error if not properly synchronized.

Returns:

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

destroy

public void destroy()