com.ptc.windchill.upgrade.util
Class FixedLengthQueue

java.lang.Object
  com.ptc.windchill.upgrade.util.FixedLengthQueue

public class FixedLengthQueue

extends Object

Threadsafe queue of fixed length that blocks on put when queue is full until room frees up and blocks on get when queue is empty until an element is added.

Field Summary

private Object[]	elements_
private int	getIndex_
private int	numElements_
private int	putIndex_

Constructor Summary

FixedLengthQueue(int capacity)
Create a queue with the specified maximum capacity.

Method Summary

Object	get() Gets the next element in the queue.
int	getCapacity() The largest number of elements that the queue can hold.
int	getCount() The number of elements currently in the queue.
void	put(Object o) Pushes a new element into the end of the queue.

Methods inherited from class java.lang.Object

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

Field Detail

elements_

private Object[] elements_

putIndex_

private int putIndex_

getIndex_

private int getIndex_

numElements_

private int numElements_

Constructor Detail

FixedLengthQueue

public FixedLengthQueue(int capacity)
                 throws IllegalArgumentException

Create a queue with the specified maximum capacity.

Throws:

IllegalArgumentException - if the capacity is set to zero or smaller

Method Detail

get

public Object get()

Gets the next element in the queue. Blocks when queue is empty until an element is added.

getCapacity

public int getCapacity()

The largest number of elements that the queue can hold.

getCount

public int getCount()

The number of elements currently in the queue.

put

public void put(Object o)

Pushes a new element into the end of the queue. Blocks when queue is full until an element is removed.