Queue (pvDataJava 6.1.4 API)

```
public interface Queue<T>
```
A finite Queue.

Author:

mrk

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`int`	`capacity()`	Get the queue capacity.
`void`	`clear()`	Set all elements free.
`QueueElement<T>`	`getFree()`	Get the next free element.
`int`	`getNumberFree()`	Get the number of free queue elements.
`QueueElement<T>`	`getUsed()`	Get the oldest used element.
`void`	`releaseUsed(QueueElement<T> queueElement)`	Release the getUsed structure.
`void`	`setUsed(QueueElement<T> queueElement)`	Set the getFree element to used.

- Method Detail
  - clear
```
void clear()
```
    Set all elements free.
  - getNumberFree
```
int getNumberFree()
```
    Get the number of free queue elements.
    
    Returns:
    
    The number.
  - capacity
```
int capacity()
```
    Get the queue capacity.
    
    Returns:
    
    the capacity
  - getFree
```
QueueElement<T> getFree()
```
    Get the next free element.
    
    Returns:
    
    the next free element or null if no free elements
  - setUsed
```
void setUsed(QueueElement<T> queueElement)
```
    Set the getFree element to used.
    
    Parameters:
    
    queueElement - the queueElement, which must be the element returned by the oldest call to getFree that was not setUsed
    
    Throws:
    
    IllegalStateException - if queueElement is not the element returned by the oldest call to getFree that was not setUsed
  - getUsed
```
QueueElement<T> getUsed()
```
    Get the oldest used element.
    
    Returns:
    
    The next used element or null if no used elements
  - releaseUsed
```
void releaseUsed(QueueElement<T> queueElement)
```
    Release the getUsed structure.
    
    Parameters:
    
    queueElement - the queueElement, which must be the element returned by the most recent call to getUsed
    
    Throws:
    
    IllegalStateException - if queueElement is not the element returned by the most recent call to getUsed