Package org.jgroups.util

Class ConcurrentLinkedBlockingQueue<T>

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Iterable<T>, java.util.Collection<T>, java.util.concurrent.BlockingQueue<T>, java.util.Queue<T>
    public class ConcurrentLinkedBlockingQueue<T>
extends java.util.concurrent.ConcurrentLinkedQueue<T>
implements java.util.concurrent.BlockingQueue<T>
    Attempt at writing a fast transfer queue, which is bounded. The take() method blocks until there is an element, but the offer() method drops the element and returns if the queue is full (doesn't block). I thought this class would be useful in ThreadPoolExecutor, as a replacement for LinkedBlockingQueue, but the perf didn't change. I'll keep it for later reference ...
    See Also:
    Serialized Form

    • Field Summary

      Fields 
      Modifier and Type Field Description
      private int capacity  
      private java.util.concurrent.locks.Lock lock  
      private java.util.concurrent.locks.Condition not_empty  
      private static long serialVersionUID  
      private java.util.concurrent.atomic.AtomicInteger waiting_takers  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      int drainTo​(java.util.Collection<? super T> c)  
      int drainTo​(java.util.Collection<? super T> c, int maxElements)  
      boolean offer​(T t)
      Drops elements if capacity has been reached.
      boolean offer​(T t, long timeout, java.util.concurrent.TimeUnit unit)  
      T poll()  
      T poll​(long timeout, java.util.concurrent.TimeUnit unit)  
      void put​(T t)  
      int remainingCapacity()  
      boolean remove​(java.lang.Object o)  
      T take()  

      • Methods inherited from class java.util.concurrent.ConcurrentLinkedQueue

        add, addAll, clear, contains, forEach, isEmpty, iterator, peek, removeAll, removeIf, retainAll, size, spliterator, toArray, toArray, toString

      • Methods inherited from class java.util.AbstractQueue

        element, remove

      • Methods inherited from class java.util.AbstractCollection

        containsAll

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

      • Methods inherited from interface java.util.concurrent.BlockingQueue

        add, contains

      • Methods inherited from interface java.util.Collection

        addAll, clear, containsAll, equals, hashCode, isEmpty, iterator, parallelStream, removeAll, removeIf, retainAll, size, spliterator, stream, toArray, toArray, toArray

      • Methods inherited from interface java.lang.Iterable

        forEach

      • Methods inherited from interface java.util.Queue

        element, peek, remove

    • Field Detail

      • capacity

        private final int capacity

      • lock

        private final java.util.concurrent.locks.Lock lock

      • not_empty

        private final java.util.concurrent.locks.Condition not_empty

      • waiting_takers

        private final java.util.concurrent.atomic.AtomicInteger waiting_takers

    • Constructor Detail

      • ConcurrentLinkedBlockingQueue

        public ConcurrentLinkedBlockingQueue​(int capacity)

    • Method Detail

      • offer

        public boolean offer​(T t)
        Drops elements if capacity has been reached. That's OK for the ThreadPoolExecutor as dropped messages will get retransmitted
        Specified by:
        offer in interface java.util.concurrent.BlockingQueue<T>
        Specified by:
        offer in interface java.util.Queue<T>
        Overrides:
        offer in class java.util.concurrent.ConcurrentLinkedQueue<T>
        Parameters:
        t -
        Returns:

      • take

        public T take()
       throws java.lang.InterruptedException
        Specified by:
        take in interface java.util.concurrent.BlockingQueue<T>
        Throws:
        java.lang.InterruptedException

      • poll

        public T poll()
        Specified by:
        poll in interface java.util.Queue<T>
        Overrides:
        poll in class java.util.concurrent.ConcurrentLinkedQueue<T>

      • poll

        public T poll​(long timeout,
              java.util.concurrent.TimeUnit unit)
       throws java.lang.InterruptedException
        Specified by:
        poll in interface java.util.concurrent.BlockingQueue<T>
        Throws:
        java.lang.InterruptedException

      • remove

        public boolean remove​(java.lang.Object o)
        Specified by:
        remove in interface java.util.concurrent.BlockingQueue<T>
        Specified by:
        remove in interface java.util.Collection<T>
        Overrides:
        remove in class java.util.concurrent.ConcurrentLinkedQueue<T>

      • remainingCapacity

        public int remainingCapacity()
        Specified by:
        remainingCapacity in interface java.util.concurrent.BlockingQueue<T>

      • drainTo

        public int drainTo​(java.util.Collection<? super T> c)
        Specified by:
        drainTo in interface java.util.concurrent.BlockingQueue<T>

      • put

        public void put​(T t)
         throws java.lang.InterruptedException
        Specified by:
        put in interface java.util.concurrent.BlockingQueue<T>
        Throws:
        java.lang.InterruptedException

      • offer

        public boolean offer​(T t,
                     long timeout,
                     java.util.concurrent.TimeUnit unit)
              throws java.lang.InterruptedException
        Specified by:
        offer in interface java.util.concurrent.BlockingQueue<T>
        Throws:
        java.lang.InterruptedException

      • drainTo

        public int drainTo​(java.util.Collection<? super T> c,
                   int maxElements)
        Specified by:
        drainTo in interface java.util.concurrent.BlockingQueue<T>