com.netflix.turbine.utils

Class ThreadSafeMultiMap<K,V>

java.lang.Object

com.netflix.turbine.utils.ThreadSafeMultiMap<K,V>

Type Parameters:

K -

V -

public class ThreadSafeMultiMap<K,V>
extends java.lang.Object

A simple implementation of a map of maps, where each inner map is a concurrent hashmap and the outer map is also a concurrent hashmap

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ThreadSafeMultiMap.UnitTest

Constructor Summary

Constructors

Constructor and Description
ThreadSafeMultiMap() Constructor

Method Summary

Methods

Modifier and Type	Method and Description
V	getValue(K key, V value) Return value V that matches key K
java.util.List<V>	getValues(K key) Return the list of values that map to the key K
java.util.Set<K>	keySet() Returns all keys associated with the map
V	putIfAbsent(K key, V value) Put the specified key value, only if both K,V do not previously exist
V	remove(K key, V value) Best effort attempt to remove the K,V from the map of maps

Methods inherited from class java.lang.Object

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

Constructor Detail

ThreadSafeMultiMap

public ThreadSafeMultiMap()

Constructor

Method Detail

putIfAbsent

public V putIfAbsent(K key,
            V value)

Put the specified key value, only if both K,V do not previously exist

Parameters:

key -

value -

Returns:

V if V previously existed

remove

public V remove(K key,
       V value)

Best effort attempt to remove the K,V from the map of maps

Parameters:

key -

value -

Returns:

V if V was actually removed

keySet

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

Returns all keys associated with the map

Returns:

Set

getValues

public java.util.List<V> getValues(K key)

Return the list of values that map to the key K

Parameters:

key -

Returns:

List

getValue

public V getValue(K key,
         V value)

Return value V that matches key K

Parameters:

key -

value -

Returns:

V or null if V is missing