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Class magician.Node.HashQueue 

java.lang.Object
   |
   +----java.util.Dictionary
           |
           +----java.util.Hashtable
                   |
                   +----magician.Node.HashQueue
public class HashQueue
extends Hashtable
A blocking queue of elements. Readers of the queue block when attempting to read when the queue is empty. The readers are woken up when an element is inserted into the queue.

Constructor Index

o HashQueue()
constructs an empty queue
o HashQueue(int)
constructs a queue of the specified size

Method Index

o delete(Object)
retrieves the element of the queue specified by given key.
o fetch(Object)
returns a reference to the element specified by given key but does not remove the element from the queue.
o insert(Object, Object)
inserts an object into the queue.

Constructors

o HashQueue 
 public HashQueue()
constructs an empty queue

o HashQueue 
 public HashQueue(int size)
constructs a queue of the specified size

Parameters:
size - the initial size of the queue

Methods

o insert 
 public synchronized Object insert(Object key,
                                   Object element)
inserts an object into the queue. If the queue was previously empty, wakes up any sleeping readers

Parameters:
key - the key under which data object is to be stored
element - the data object to be placed on the queue
o delete 
 public synchronized Object delete(Object key)
retrieves the element of the queue specified by given key. If the queue is empty, this method blocks until one is available.

Parameters:
key - key for the requiree element
Returns:
s the first element of the queue
Throws: InterruptedException
if operation is interrupted
o fetch 
 public synchronized Object fetch(Object key) throws InterruptedException
returns a reference to the element specified by given key but does not remove the element from the queue. If the queue is empty, it returns null.

Parameters:
key - key for the required element
Returns:
s the element or null if there is no element associated by that key 
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