Package org.eclipse.epsilon.common.concurrent

Class ConcurrentCASList<E>

  • All Implemented Interfaces:
    java.lang.Iterable<E>, java.util.Collection<E>, java.util.List<E>
    public class ConcurrentCASList<E>
extends java.lang.Object
implements java.util.List<E>
    A List implementation intended to be used in places where an API requires a List but doesn't actually use the indexes - it just needs ordering. In concurrent environments, Lists are highly inconvenient due to their sequential nature. This class therefore mimics a list when infact it's actually a ConcurrentLinkedDeque.

    AS A RESULT, USERS SHOULD NOT RELY ON INDEXES! THIS LIST IS SIMPLY A FACADE FOR POORLY DESIGNED / OVERSPECIFIED APIs WITH NO REGARDS FOR CONCURRENCY.
    Since:
    1.6
    Author:
    Sina Madani

    • Field Summary

      Fields 
      Modifier and Type Field Description
      protected java.util.concurrent.atomic.AtomicInteger cachedSize  
      protected java.util.concurrent.ConcurrentLinkedDeque<E> deque  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void add​(int index, E element)  
      boolean add​(E element)  
      boolean addAll​(int index, java.util.Collection<? extends E> col)  
      boolean addAll​(java.util.Collection<? extends E> elements)  
      void clear()  
      boolean contains​(java.lang.Object element)  
      boolean containsAll​(java.util.Collection<?> elements)  
      E get​(int index)  
      int indexOf​(java.lang.Object element)  
      boolean isEmpty()  
      java.util.Iterator<E> iterator()  
      int lastIndexOf​(java.lang.Object element)  
      java.util.ListIterator<E> listIterator()  
      java.util.ListIterator<E> listIterator​(int index)  
      E remove​(int index)  
      boolean remove​(java.lang.Object element)  
      boolean removeAll​(java.util.Collection<?> elements)  
      boolean retainAll​(java.util.Collection<?> elements)  
      E set​(int index, E element)  
      int size()  
      java.util.List<E> subList​(int from, int to)  
      java.lang.Object[] toArray()  
      <T> T[] toArray​(T[] arr)  
      protected boolean validateIndex​(int index)
      Checks whether index is 0 or the size of the list.

      • Methods inherited from class java.lang.Object

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

      • Methods inherited from interface java.util.Collection

        parallelStream, removeIf, stream, toArray

      • Methods inherited from interface java.lang.Iterable

        forEach

      • Methods inherited from interface java.util.List

        equals, hashCode, replaceAll, sort, spliterator

    • Field Detail

      • deque

        protected final java.util.concurrent.ConcurrentLinkedDeque<E> deque

      • cachedSize

        protected final java.util.concurrent.atomic.AtomicInteger cachedSize

    • Constructor Detail

      • ConcurrentCASList

        public ConcurrentCASList()

    • Method Detail

      • validateIndex

        protected final boolean validateIndex​(int index)
        Checks whether index is 0 or the size of the list.
        Returns:
        true means first, false means last.
        Throws:
        java.lang.UnsupportedOperationException - if index is not 0 or size().

      • get

        public E get​(int index)
        Specified by:
        get in interface java.util.List<E>

      • size

        public int size()
        Specified by:
        size in interface java.util.Collection<E>
        Specified by:
        size in interface java.util.List<E>

      • add

        public void add​(int index,
                E element)
        Specified by:
        add in interface java.util.List<E>

      • set

        public E set​(int index,
             E element)
        Specified by:
        set in interface java.util.List<E>

      • remove

        public E remove​(int index)
        Specified by:
        remove in interface java.util.List<E>

      • addAll

        public boolean addAll​(int index,
                      java.util.Collection<? extends E> col)
        Specified by:
        addAll in interface java.util.List<E>

      • add

        public boolean add​(E element)
        Specified by:
        add in interface java.util.Collection<E>
        Specified by:
        add in interface java.util.List<E>

      • addAll

        public boolean addAll​(java.util.Collection<? extends E> elements)
        Specified by:
        addAll in interface java.util.Collection<E>
        Specified by:
        addAll in interface java.util.List<E>

      • clear

        public void clear()
        Specified by:
        clear in interface java.util.Collection<E>
        Specified by:
        clear in interface java.util.List<E>

      • contains

        public boolean contains​(java.lang.Object element)
        Specified by:
        contains in interface java.util.Collection<E>
        Specified by:
        contains in interface java.util.List<E>

      • containsAll

        public boolean containsAll​(java.util.Collection<?> elements)
        Specified by:
        containsAll in interface java.util.Collection<E>
        Specified by:
        containsAll in interface java.util.List<E>

      • isEmpty

        public boolean isEmpty()
        Specified by:
        isEmpty in interface java.util.Collection<E>
        Specified by:
        isEmpty in interface java.util.List<E>

      • iterator

        public java.util.Iterator<E> iterator()
        Specified by:
        iterator in interface java.util.Collection<E>
        Specified by:
        iterator in interface java.lang.Iterable<E>
        Specified by:
        iterator in interface java.util.List<E>

      • remove

        public boolean remove​(java.lang.Object element)
        Specified by:
        remove in interface java.util.Collection<E>
        Specified by:
        remove in interface java.util.List<E>

      • removeAll

        public boolean removeAll​(java.util.Collection<?> elements)
        Specified by:
        removeAll in interface java.util.Collection<E>
        Specified by:
        removeAll in interface java.util.List<E>

      • toArray

        public java.lang.Object[] toArray()
        Specified by:
        toArray in interface java.util.Collection<E>
        Specified by:
        toArray in interface java.util.List<E>

      • toArray

        public <T> T[] toArray​(T[] arr)
        Specified by:
        toArray in interface java.util.Collection<E>
        Specified by:
        toArray in interface java.util.List<E>

      • retainAll

        public boolean retainAll​(java.util.Collection<?> elements)
        Specified by:
        retainAll in interface java.util.Collection<E>
        Specified by:
        retainAll in interface java.util.List<E>

      • indexOf

        public int indexOf​(java.lang.Object element)
        Specified by:
        indexOf in interface java.util.List<E>

      • lastIndexOf

        public int lastIndexOf​(java.lang.Object element)
        Specified by:
        lastIndexOf in interface java.util.List<E>

      • listIterator

        public java.util.ListIterator<E> listIterator()
        Specified by:
        listIterator in interface java.util.List<E>

      • listIterator

        public java.util.ListIterator<E> listIterator​(int index)
        Specified by:
        listIterator in interface java.util.List<E>

      • subList

        public java.util.List<E> subList​(int from,
                                 int to)
        Specified by:
        subList in interface java.util.List<E>