org.apache.cassandra.utils.concurrent

Class Accumulator<E>

java.lang.Object

org.apache.cassandra.utils.concurrent.Accumulator<E>

Type Parameters:

E -

public class Accumulator<E>
extends java.lang.Object

A simple append-only collection supporting an unbounded number of concurrent readers/writers, but a bounded number of items.

Constructor Summary

Constructors

Constructor and Description
Accumulator(int size)

Method Summary

Modifier and Type	Method and Description
void	add(E item) Adds an item to the collection.
int	capacity()
void	clearUnsafe(int i) Removes element at the speficied index from this accumulator.
E	get(int i)
boolean	isEmpty()
int	size()
java.util.Collection<E>	snapshot()

Methods inherited from class java.lang.Object

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

Constructor Detail

Accumulator

public Accumulator(int size)

Method Detail

add

public void add(E item)

Adds an item to the collection. Note it is not guaranteed to be visible on exiting the method, if another add was happening concurrently; it will be visible once all concurrent adds (which are non-blocking) complete, but it is not guaranteed that any size change occurs during the execution of any specific call.

Parameters:

item - add to collection

isEmpty

public boolean isEmpty()

size

public int size()

Returns:

the size of guaranteed-to-be-visible portion of the list

capacity

public int capacity()

get

public E get(int i)

snapshot

public java.util.Collection<E> snapshot()

clearUnsafe

public void clearUnsafe(int i)

Removes element at the speficied index from this accumulator. This method is not thread-safe when used concurrently with add(Object).