edu.jas.util

Class DistHashTable<K,V>

java.lang.Object

java.util.AbstractMap<K,V>

edu.jas.util.DistHashTable<K,V>

All Implemented Interfaces:

java.util.Map<K,V>

public class DistHashTable<K,V>
extends java.util.AbstractMap<K,V>

Distributed version of a HashTable. Implemented with a SortedMap / TreeMap to keep the sequence order of elements.

Author:

Heinz Kredel

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

java.util.AbstractMap.SimpleEntry<K,V>, java.util.AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

java.util.Map.Entry<K,V>

Field Summary

Fields

Modifier and Type	Field and Description
protected ChannelFactory	cf
protected SocketChannel	channel
protected edu.jas.util.DHTListener<K,V>	listener
protected java.util.SortedMap<K,V>	theList

Constructor Summary

Constructors

Constructor and Description
DistHashTable(ChannelFactory cf, java.lang.String host, int port) DistHashTable.
DistHashTable(SocketChannel sc) DistHashTable.
DistHashTable(java.lang.String host) Constructs a new DistHashTable.
DistHashTable(java.lang.String host, int port) DistHashTable.

Method Summary

Modifier and Type	Method and Description
void	clear() Clear the List.
boolean	containsKey(java.lang.Object o) Contains key.
boolean	containsValue(java.lang.Object o) Contains value.
java.util.Set<java.util.Map.Entry<K,V>>	entrySet() Get the entries as Set.
boolean	equals(java.lang.Object o) Equals.
V	get(java.lang.Object key) Get value under key from DHT.
java.util.SortedMap<K,V>	getList() Get the internal sorted map.
java.util.List<V>	getValueList() Get the internal list, convert from Collection.
V	getWait(K key) Get value under key from DHT.
int	hashCode() Hash code.
void	init() Initialize and start the list thread.
boolean	isEmpty() Is the List empty?
java.util.Iterator<K>	iterator() List key iterator.
java.util.Set<K>	keySet() Get the keys as set.
V	put(K key, V value) Put object to the distributed hash table.
void	putWait(K key, V value) Put object to the distributed hash table.
int	size() Size of the (local) list.
void	terminate() Terminate the list thread.
java.util.Iterator<V>	valueIterator() List value iterator.
java.util.Collection<V>	values() Get the values as Collection.

Methods inherited from class java.util.AbstractMap

clone, putAll, remove, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll

Field Detail

theList

protected final java.util.SortedMap<K,V> theList

cf

protected final ChannelFactory cf

channel

protected SocketChannel channel

listener

protected edu.jas.util.DHTListener<K,V> listener

Constructor Detail

DistHashTable

public DistHashTable(java.lang.String host)

Constructs a new DistHashTable.

Parameters:

host - name or IP of server host.

DistHashTable

public DistHashTable(java.lang.String host,
                     int port)

DistHashTable.

Parameters:

host - name or IP of server host.

port - on server.

DistHashTable

public DistHashTable(ChannelFactory cf,
                     java.lang.String host,
                     int port)

DistHashTable.

Parameters:

cf - ChannelFactory to use.

host - name or IP of server host.

port - on server.

DistHashTable

public DistHashTable(SocketChannel sc)

DistHashTable.

Parameters:

sc - SocketChannel to use.

Method Detail

hashCode

public int hashCode()

Hash code.

Specified by:

hashCode in interface java.util.Map<K,V>

Overrides:

hashCode in class java.util.AbstractMap<K,V>

equals

public boolean equals(java.lang.Object o)

Equals.

Specified by:

equals in interface java.util.Map<K,V>

Overrides:

equals in class java.util.AbstractMap<K,V>

containsKey

public boolean containsKey(java.lang.Object o)

Contains key.

Specified by:

containsKey in interface java.util.Map<K,V>

Overrides:

containsKey in class java.util.AbstractMap<K,V>

containsValue

public boolean containsValue(java.lang.Object o)

Contains value.

Specified by:

containsValue in interface java.util.Map<K,V>

Overrides:

containsValue in class java.util.AbstractMap<K,V>

values

public java.util.Collection<V> values()

Get the values as Collection.

Specified by:

values in interface java.util.Map<K,V>

Overrides:

values in class java.util.AbstractMap<K,V>

keySet

public java.util.Set<K> keySet()

Get the keys as set.

Specified by:

keySet in interface java.util.Map<K,V>

Overrides:

keySet in class java.util.AbstractMap<K,V>

entrySet

public java.util.Set<java.util.Map.Entry<K,V>> entrySet()

Get the entries as Set.

Specified by:

entrySet in interface java.util.Map<K,V>

Specified by:

entrySet in class java.util.AbstractMap<K,V>

getValueList

public java.util.List<V> getValueList()

Get the internal list, convert from Collection.

getList

public java.util.SortedMap<K,V> getList()

Get the internal sorted map. For synchronization purpose in normalform.

size

public int size()

Size of the (local) list.

Specified by:

size in interface java.util.Map<K,V>

Overrides:

size in class java.util.AbstractMap<K,V>

isEmpty

public boolean isEmpty()

Is the List empty?

Specified by:

isEmpty in interface java.util.Map<K,V>

Overrides:

isEmpty in class java.util.AbstractMap<K,V>

iterator

public java.util.Iterator<K> iterator()

List key iterator.

valueIterator

public java.util.Iterator<V> valueIterator()

List value iterator.

putWait

public void putWait(K key,
                    V value)

Put object to the distributed hash table. Blocks until the key value pair is send and received from the server.

Parameters:

key -

value -

put

public V put(K key,
             V value)

Put object to the distributed hash table. Returns immediately after sending, does not block.

Specified by:

put in interface java.util.Map<K,V>

Overrides:

put in class java.util.AbstractMap<K,V>

Parameters:

key -

value -

getWait

public V getWait(K key)

Get value under key from DHT. Blocks until the object is send and received from the server (actually it blocks until some value under key is received).

Parameters:

key -

Returns:

the value stored under the key.

get

public V get(java.lang.Object key)

Get value under key from DHT. If no value is jet available null is returned.

Specified by:

get in interface java.util.Map<K,V>

Overrides:

get in class java.util.AbstractMap<K,V>

Parameters:

key -

Returns:

the value stored under the key.

clear

public void clear()

Clear the List. Clearance request is distributed to all clients.

Specified by:

clear in interface java.util.Map<K,V>

Overrides:

clear in class java.util.AbstractMap<K,V>

init

public void init()

Initialize and start the list thread.

terminate

public void terminate()

Terminate the list thread.