IRingbuffer(T).Add Method

IRingbufferTAdd Method

Hazelcast .Net Client Class Library

Adds an item to the tail of the Ringbuffer.

Namespace: Hazelcast.Core
Assembly: Hazelcast.Net (in Hazelcast.Net.dll) Version: 3.6.2.0

Syntax

long Add(
	T item
)

Function Add ( 
	item As T
) As Long

long long Add(
	T item
)

abstract Add : 
        item : 'T -> int64

Parameters

item: Type: T
the item to add.

Return Value

Type: Int64
the sequence of the added item.

Exceptions

Exception	Condition
ArgumentNullException	if item is null.

Remarks

Adds an item to the tail of the Ringbuffer. If there is no space in the Ringbuffer, the add will overwrite the oldest item in the ringbuffer no matter what the ttl is. For more control on this behavior, check the AddAsync(T, OverflowPolicy) and the OverflowPolicy . The returned value is the sequence of the added item. Using this sequence you can read the added item.

Using the sequence as id

This sequence will always be unique for this Ringbuffer instance so it can be used as a unique id generator if you are publishing items on this Ringbuffer. However you need to take care of correctly determining an initial id when any node uses the ringbuffer for the first time. The most reliable way to do that is to write a dummy item into the ringbuffer and use the returned sequence as initial id. On the reading side, this dummy item should be discard. Please keep in mind that this id is not the sequence of the item you are about to publish but from a previously published item. So it can't be used to find that item.

Reference

IRingbufferT Interface

Hazelcast.Core Namespace

IRingbufferTAddAsync(T, OverflowPolicy)