Examples of com.sun.jts.CosTransactions.RWLock$Queue

com.deitel.jhtp6.ch17.Queue

A RWLock provides concurrency control for multiple readers single writer access patterns. This lock can provide access to multiple reader threads simultaneously as long as there are no writer threads. Once a writer thread gains access to the instance locked by a RWLock, all the reader threads wait till the writer completes accessing the instance in question.

A RWLock is extremely useful in scenarios where there are lots more readers and very few writers to a data structure. Also if the read operation by the reader thread could take significant amount of time (binary search etc.)

The usage of Lock can be see as under:

 public class MyBTree { private RWLock lock = new Lock(); ..... ..... public Object find(Object o) { try { lock.acquireReadLock(); ....perform complex search to get the Object ... return result; } finally { lock.releaseReadLock(); } } public void insert(Object o) { try { lock.acquireWriteLock(); ....perform complex operation to insert object ... } finally { lock.releaseWriteLock(); } } }

@author Dhiru Pandey 8/7/2000


public class QueueTest 
{
   public static void main( String args[] )
   {
      Queue queue = new Queue();  


      // use enqueue method
      queue.enqueue( -1 );
      queue.print();
      queue.enqueue( 0 );
      queue.print();
      queue.enqueue( 1 );
      queue.print();
      queue.enqueue( 5 );
      queue.print();


      // remove objects from queue
      try 
      {
         Object removedObject = null;


         while ( true ) 
         {
            removedObject = queue.dequeue(); // use dequeue method
            System.out.printf( "%s dequeued\n", removedObject );
            queue.print();
         } // end while
      } // end try
      catch ( EmptyListException emptyListException ) 
      {
         emptyListException.printStackTrace();

Examples of com.sun.jts.CosTransactions.RWLock$Queue

Related Classes of com.sun.jts.CosTransactions.RWLock$Queue