com.rabbitmq.client.impl
T
- type of elements in the queuepublic class SetQueue<T> extends java.lang.Object
addIfNotPresent
,
poll
, contains
, and isEmpty
)
which restricts a queue element to appear at most once.
If the element is already present addIfNotPresent(T)
returns false
.
Elements must not be null
.
Concurrent SemanticsConstructor and Description |
---|
SetQueue() |
Modifier and Type | Method and Description |
---|---|
boolean |
addIfNotPresent(T item)
Add an element to the back of the queue and return
true , or else return false . |
void |
clear()
Remove all items from the queue.
|
boolean |
contains(T item) |
boolean |
isEmpty() |
T |
poll()
Remove the head of the queue and return it.
|
boolean |
remove(T item)
Remove item from queue, if present.
|
public boolean addIfNotPresent(T item)
true
, or else return false
.item
- to addtrue
if the element was added, false
if it is already present.public T poll()
null
if the queue is empty.public boolean contains(T item)
item
- to look for in queuetrue
if and only if item is in the queue.public boolean isEmpty()
true
if and only if the queue is empty.public boolean remove(T item)
item
- to removetrue
if and only if item was initially present and was removed.public void clear()