org.apache.hadoop.hbase.util

Class PoolMap<K,V>

java.lang.Object

org.apache.hadoop.hbase.util.PoolMap<K,V>

Type Parameters:

K - the type of the key to the resource

V - the type of the resource being pooled

All Implemented Interfaces:

Map<K,V>

@InterfaceAudience.Private
public class PoolMap<K,V>
extends Object
implements Map<K,V>

The PoolMap maps a key to a collection of values, the elements of which are managed by a pool. In effect, that collection acts as a shared pool of resources, access to which is closely controlled as per the semantics of the pool.

In case the size of the pool is set to a non-zero positive number, that is used to cap the number of resources that a pool may contain for any given key. A size of Integer.MAX_VALUE is interpreted as an unbounded pool.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static interface	PoolMap.Pool<R>
static class	PoolMap.PoolType
static class	PoolMap.ReusablePool<R> The ReusablePool represents a PoolMap.Pool that builds on the LinkedList class.
(package private) static class	PoolMap.RoundRobinPool<R> The RoundRobinPool represents a PoolMap.Pool, which stores its resources in an ArrayList.
(package private) static class	PoolMap.ThreadLocalPool<R> The ThreadLocalPool represents a PoolMap.Pool that builds on the ThreadLocal class.

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

Map.Entry<K,V>

Field Summary

Fields

Modifier and Type	Field and Description
private int	poolMaxSize
private Map<K,PoolMap.Pool<V>>	pools
private PoolMap.PoolType	poolType

Constructor Summary

Constructors

Constructor and Description
PoolMap(PoolMap.PoolType poolType)
PoolMap(PoolMap.PoolType poolType, int poolMaxSize)

Method Summary

Modifier and Type	Method and Description
void	clear()
boolean	containsKey(Object key)
boolean	containsValue(Object value)
protected PoolMap.Pool<V>	createPool()
Set<Map.Entry<K,V>>	entrySet()
V	get(Object key)
boolean	isEmpty()
Set<K>	keySet()
V	put(K key, V value)
void	putAll(Map<? extends K,? extends V> map)
V	remove(Object key)
boolean	removeValue(K key, V value)
int	size()
int	size(K key)
Collection<V>	values()
Collection<V>	values(K key)

Methods inherited from class java.lang.Object

clone, equals, finalize, 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

Field Detail

poolType

private PoolMap.PoolType poolType

poolMaxSize

private int poolMaxSize

pools

private Map<K,PoolMap.Pool<V>> pools

Constructor Detail

PoolMap

public PoolMap(PoolMap.PoolType poolType)

PoolMap

public PoolMap(PoolMap.PoolType poolType,
               int poolMaxSize)

Method Detail

get

public V get(Object key)

Specified by:

get in interface Map<K,V>

put

public V put(K key,
             V value)

Specified by:

put in interface Map<K,V>

remove

public V remove(Object key)

Specified by:

remove in interface Map<K,V>

removeValue

public boolean removeValue(K key,
                           V value)

values

public Collection<V> values()

Specified by:

values in interface Map<K,V>

values

public Collection<V> values(K key)

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<K,V>

size

public int size()

Specified by:

size in interface Map<K,V>

size

public int size(K key)

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<K,V>

containsValue

public boolean containsValue(Object value)

Specified by:

containsValue in interface Map<K,V>

putAll

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

Specified by:

putAll in interface Map<K,V>

clear

public void clear()

Specified by:

clear in interface Map<K,V>

keySet

public Set<K> keySet()

Specified by:

keySet in interface Map<K,V>

entrySet

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

Specified by:

entrySet in interface Map<K,V>

createPool

protected PoolMap.Pool<V> createPool()