Accumulator (apache-cassandra API)

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 Description

Accumulator(int size)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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).