jadex.commons.collection

Class PersistentMap2<K,V>

java.lang.Object

jadex.commons.collection.PersistentMap2<K,V>

All Implemented Interfaces:

Map<K,V>

public class PersistentMap2<K,V>
extends Object
implements Map<K,V>

A map implementation supporting automatic serialization its data and persisting it on disk.

Nested Class Summary

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

Map.Entry<K,V>

Constructor Summary

Constructors

Constructor and Description
PersistentMap2(File file, boolean synchronous, ClassLoader classloader) Creates the map.

Method Summary

Modifier and Type	Method and Description
void	clear() Removes all of the entries from this map.
void	close() Closes the persistence file.
void	compact() Removes stale entries and compacts the map.
boolean	containsKey(Object key) Returns whether this map contains the specified key.
boolean	containsValue(Object value) Returns whether the map contains the specified value.
V	doRemove(Object key)
Set<Map.Entry<K,V>>	entrySet() Returns the map's entry set.
V	get(Object key) Returns the value for a specified key.
long	getDirtyBytes() Returns the bytes wasted due to stale entries.
boolean	isEmpty() Returns whether this map is empty.
Set<K>	keySet() Returns the keys of the map.
static void	main(String[] args) Test main method.
V	put(K key, V value) Puts a new value in the map.
void	putAll(Map<? extends K,? extends V> m) Copies entries from the specified map to this map,
V	remove(Object key) Removes a map entry.
void	setAutoCompactionThreshold(long threshold) Sets the threshold of stale bytes before auto-compaction is executed.
int	size() Returns the size of the map.
Collection<V>	values() Returns the values of the map.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Map

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

Constructor Detail

PersistentMap2

public PersistentMap2(File file,
                      boolean synchronous,
                      ClassLoader classloader)

Creates the map.

Parameters:

file - File used for persistent data.

Method Detail

main

public static void main(String[] args)

Test main method.

Parameters:

args - Arguments.

size

public int size()

Returns the size of the map.

Specified by:

size in interface Map<K,V>

isEmpty

public boolean isEmpty()

Returns whether this map is empty.

Specified by:

isEmpty in interface Map<K,V>

containsKey

public boolean containsKey(Object key)

Returns whether this map contains the specified key.

Specified by:

containsKey in interface Map<K,V>

containsValue

public boolean containsValue(Object value)

Returns whether the map contains the specified value. NOTE: This is very slow, use with caution.

Specified by:

containsValue in interface Map<K,V>

get

public V get(Object key)

Returns the value for a specified key.

Specified by:

get in interface Map<K,V>

put

public V put(K key,
             V value)

Puts a new value in the map.

Specified by:

put in interface Map<K,V>

remove

public V remove(Object key)

Removes a map entry.

Specified by:

remove in interface Map<K,V>

putAll

public void putAll(Map<? extends K,? extends V> m)

Copies entries from the specified map to this map,

Specified by:

putAll in interface Map<K,V>

clear

public void clear()

Removes all of the entries from this map.

Specified by:

clear in interface Map<K,V>

keySet

public Set<K> keySet()

Returns the keys of the map. Note: Unlike other maps, this is the preferred (fastest mode) for iteration.

Specified by:

keySet in interface Map<K,V>

values

public Collection<V> values()

Returns the values of the map. NOTE: This is very slow, use with caution.

Specified by:

values in interface Map<K,V>

entrySet

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

Returns the map's entry set. Warning: SLOW!

Specified by:

entrySet in interface Map<K,V>

compact

public void compact()

Removes stale entries and compacts the map.

close

public void close()

Closes the persistence file. The map ceases to function after calling this.

getDirtyBytes

public long getDirtyBytes()

Returns the bytes wasted due to stale entries.

setAutoCompactionThreshold

public void setAutoCompactionThreshold(long threshold)

Sets the threshold of stale bytes before auto-compaction is executed. Setting the threshold to Long.MAX_VALUE disables auto-compaction.

doRemove

public V doRemove(Object key)