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java.lang.Object | +--org.javagroups.util.LinkedListQueue
LinkedListQueue implementation based on java.util.Queue. Can be renamed to Queue.java and compiled if someone wants to use this implementation rather than the original Queue. However, a simple insertion and removal of 1 million objects into this queue shoed that it was ca. 15-20% slower than the original queue. We just include it in the JavaGroups distribution to maybe use it at a later point when it has become faster.
Constructor Summary | |
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LinkedListQueue()
creates an empty queue |
Method Summary | |
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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. |
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. |
void |
close(boolean flush_entries)
Marks the queues as closed. |
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. |
java.util.Vector |
getContents()
returns a vector with all the objects currently in the queue |
java.lang.Object |
peek()
returns the first object on the queue, without removing it. |
java.lang.Object |
peek(long timeout)
returns the first object on the queue, without removing it. |
java.lang.Object |
remove()
Removes 1 element from head or blocks until next element has been added |
java.lang.Object |
remove(long timeout)
Removes 1 element from the head. |
void |
removeElement(java.lang.Object obj)
removes a specific object from the queue. |
void |
reset()
resets the queue. |
int |
size()
returns the number of objects that are currently in the queue |
java.lang.String |
toString()
prints the size of the queue |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
public LinkedListQueue()
Method Detail |
public boolean closed()
public void add(java.lang.Object obj) throws QueueClosedException
obj
- - the object to be added to the queue
QueueClosed
- exception if closed() returns true
QueueClosedException
public void addAtHead(java.lang.Object obj) throws QueueClosedException
obj
- - the object to be added to the queue
QueueClosed
- exception if closed() returns true
QueueClosedException
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 out
QueueClosedException
TimeoutException
public void removeElement(java.lang.Object obj) throws QueueClosedException
obj
- the actual object to be removed from the queue
QueueClosedException
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 out
QueueClosedException
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()
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