com.gargoylesoftware.base.trace
Class BlockingCircularQueue

java.lang.Object
  com.gargoylesoftware.base.trace.BlockingCircularQueue

All Implemented Interfaces:

Serializable

public class BlockingCircularQueue

extends Object

implements Serializable

Internal use only.

.

A circular queue with blocking semantics.

Version:

$Revision: 1.8 $

Author:

Mike Bowler

See Also:

Serialized Form

Constructor Summary

BlockingCircularQueue()
Create the queue with a capacity of 20

BlockingCircularQueue(int capacity)
Create the queue with the specified capacity

Method Summary

boolean	add(Object object) Add an object to the queue.
protected void	assertNotNull(String fieldName, Object fieldValue) Verify that the specified value is not null.
void	clear() Remove all items from the queue
boolean	isEmpty() Return true if the collection is empty.
Object	next() Return the next item in the queue.
int	size() Return the number of objects currently in the collection.
String	toString() Return a string representation of this object.

Methods inherited from class java.lang.Object

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

Constructor Detail

BlockingCircularQueue

public BlockingCircularQueue()

Create the queue with a capacity of 20

BlockingCircularQueue

public BlockingCircularQueue(int capacity)

Create the queue with the specified capacity

Parameters:

capacity - The size of the queue

Method Detail

clear

public void clear()

Remove all items from the queue

add

public boolean add(Object object)

Add an object to the queue. If the collection is currently full then block until an object is removed.

Parameters:

object - The object to add.

Returns:

true if the object was successfully added.

next

public Object next()

Return the next item in the queue. The returned item is removed from the collection. If no objects are present then block until an object has been added.

Returns:

The next item.

size

public int size()

Return the number of objects currently in the collection.

Returns:

The object count.

isEmpty

public boolean isEmpty()

Return true if the collection is empty.

Returns:

true if the collection is empty.

toString

public String toString()

Return a string representation of this object.

Returns:

a string representation of this object.

assertNotNull

protected final void assertNotNull(String fieldName,
                                   Object fieldValue)
                            throws DetailedNullPointerException

Verify that the specified value is not null. If it is then throw an exception

Parameters:

fieldName - The name of the field to check

fieldValue - The value of the field to check

Throws:

DetailedNullPointerException - If fieldValue is null