Package org.apache.bookkeeper.util

Class SnapshotMap<K,V>

java.lang.Object

org.apache.bookkeeper.util.SnapshotMap<K,V>

public class SnapshotMap<K,V>
extends Object

A snapshotable map.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) final ReentrantReadWriteLock	lock
(package private) NavigableMap<K,V>	snapshot
(package private) Map<K,V>	updates
(package private) Map<K,V>	updatesToMerge

Constructor Summary

Constructors

Constructor	Description
SnapshotMap()

Method Summary

Modifier and Type	Method	Description
boolean	containsKey(K key)	Returns true if this map contains a mapping for the specified key.
void	put(K key, V value)	Associates the specified value with the specified key in this map.
void	remove(K key)	Removes the mapping for the key from this map if it is present.
NavigableMap<K,V>	snapshot()	Create a snapshot of current map.

Methods inherited from class java.lang.Object

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

Field Details

updates

volatile Map<K,V> updates

updatesToMerge

volatile Map<K,V> updatesToMerge

snapshot

volatile NavigableMap<K,V> snapshot

lock

final ReentrantReadWriteLock lock

Constructor Details

SnapshotMap

public SnapshotMap()

Method Details

snapshot

public NavigableMap<K,V> snapshot()

Create a snapshot of current map.

Returns:

a snapshot of current map.

put

public void put(K key,
 V value)

Associates the specified value with the specified key in this map.

Parameters:

key - Key with which the specified value is to be associated.

value - Value to be associated with the specified key.

remove

public void remove(K key)

Removes the mapping for the key from this map if it is present.

Parameters:

key - Key whose mapping is to be removed from this map.

containsKey

public boolean containsKey(K key)

Returns true if this map contains a mapping for the specified key.

Parameters:

key - Key whose presence is in the map to be tested.

Returns:

true if the map contains a mapping for the specified key.