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Java Source Code / Java Documentation » Testing » DbUnit » org.dbunit.util.concurrent 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.dbunit.util.concurrent.LinkedQueue

LinkedQueue
public class LinkedQueue implements Channel(Code)
A linked list based channel implementation. The algorithm avoids contention between puts and takes when the queue is not empty. Normally a put and a take can proceed simultaneously. (Although it does not allow multiple concurrent puts or takes.) This class tends to perform more efficently than other Channel implementations in producer/consumer applications.

[ Introduction to this package. ]



Field Summary
protected  LinkedNodehead_
     Dummy header node of list.
protected  LinkedNodelast_
     The last node of list.
final protected  ObjectputLock_
     Helper monitor for managing access to last node.
protected  intwaitingForTake_
     The number of threads waiting for a take.

Constructor Summary
public  LinkedQueue()
    

Method Summary
protected synchronized  Objectextract()
    
protected  voidinsert(Object x)
    
public  booleanisEmpty()
    
public  booleanoffer(Object x, long msecs)
    
public  Objectpeek()
    
public  Objectpoll(long msecs)
    
public  voidput(Object x)
    
public  Objecttake()
    

Field Detail
head_
protected LinkedNode head_(Code)
Dummy header node of list. The first actual node, if it exists, is always at head_.next. After each take, the old first node becomes the head.



last_
protected LinkedNode last_(Code)
The last node of list. Put() appends to list, so modifies last_



putLock_
final protected Object putLock_(Code)
Helper monitor for managing access to last node.



waitingForTake_
protected int waitingForTake_(Code)
The number of threads waiting for a take. Notifications are provided in put only if greater than zero. The bookkeeping is worth it here since in reasonably balanced usages, the notifications will hardly ever be necessary, so the call overhead to notify can be eliminated.




Constructor Detail
LinkedQueue
public LinkedQueue()(Code)




Method Detail
extract
protected synchronized Object extract()(Code)
Main mechanics for take/poll *



insert
protected void insert(Object x)(Code)
Main mechanics for put/offer *



isEmpty
public boolean isEmpty()(Code)



offer
public boolean offer(Object x, long msecs) throws InterruptedException(Code)



peek
public Object peek()(Code)



poll
public Object poll(long msecs) throws InterruptedException(Code)



put
public void put(Object x) throws InterruptedException(Code)



take
public Object take() throws InterruptedException(Code)



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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