public class LinkedListQueue
extends java.lang.Object
Modifier and Type | Field and Description |
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protected static org.apache.commons.logging.Log |
log |
Constructor and Description |
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LinkedListQueue()
creates an empty queue
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Modifier and Type | Method and Description |
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void |
add(java.lang.Object obj)
adds an object to the tail of this queue
If the queue has been closed with close(true) no exception will be
thrown if the queue has not been flushed yet.
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void |
addAtHead(java.lang.Object obj)
Adds a new object to the head of the queue
basically (obj.equals(LinkedListQueue.remove(LinkedListQueue.add(obj)))) returns true
If the queue has been closed with close(true) no exception will be
thrown if the queue has not been flushed yet.
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void |
close(boolean flush_entries)
Marks the queues as closed.
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boolean |
closed()
returns true if the Queue has been closed
however, this method will return false if the queue has been closed
using the close(true) method and the last element has yet not been received.
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java.util.Vector |
getContents()
returns a vector with all the objects currently in the queue
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java.lang.Object |
peek()
returns the first object on the queue, without removing it.
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java.lang.Object |
peek(long timeout)
returns the first object on the queue, without removing it.
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java.lang.Object |
remove()
Removes 1 element from head or blocks
until next element has been added
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java.lang.Object |
remove(long timeout)
Removes 1 element from the head.
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void |
removeElement(java.lang.Object obj)
removes a specific object from the queue.
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void |
reset()
resets the queue.
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int |
size()
returns the number of objects that are currently in the queue
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java.lang.String |
toString()
prints the size of the queue
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public boolean closed()
public void add(java.lang.Object obj) throws QueueClosedException
obj
- - the object to be added to the queueQueueClosed
- exception if closed() returns trueQueueClosedException
public void addAtHead(java.lang.Object obj) throws QueueClosedException
obj
- - the object to be added to the queueQueueClosed
- exception if closed() returns trueQueueClosedException
public java.lang.Object remove() throws QueueClosedException
QueueClosedException
public java.lang.Object remove(long timeout) throws QueueClosedException, TimeoutException
timeout
- - the number of milli seconds this operation will wait before it times outQueueClosedException
TimeoutException
public void removeElement(java.lang.Object obj) throws QueueClosedException
obj
- the actual object to be removed from the queueQueueClosedException
public java.lang.Object peek() throws QueueClosedException
QueueClosedException
public java.lang.Object peek(long timeout) throws QueueClosedException, TimeoutException
timeout
- how long in milli seconds will this operation wait for an object to be added to the queue
before it times outQueueClosedException
TimeoutException
public void close(boolean flush_entries)
add
or remove
operation is
attempted on a closed queue, an exception is thrown.flush_entries
- When true, a end-of-entries marker is added to the end of the queue.
Entries may be added and removed, but when the end-of-entries marker
is encountered, the queue is marked as closed. This allows to flush
pending messages before closing the queue.public void reset()
public int size()
public java.lang.String toString()
toString
in class java.lang.Object
public java.util.Vector getContents()
Copyright ? 1998-2006 Bela Ban. All Rights Reserved.