Examples of edu.emory.mathcs.backport.java.util.concurrent.CopyOnWriteArrayList$COWSubList

Package edu.emory.mathcs.backport.java.util.concurrent

Examples of edu.emory.mathcs.backport.java.util.concurrent.CopyOnWriteArrayList$COWSubList

edu.emory.mathcs.backport.java.util.concurrent.CopyOnWriteArrayList
Sublist for CopyOnWriteArrayList. This class extends AbstractList merely for convenience, to avoid having to define addAll, etc. This doesn't hurt, but is wasteful. This class does not need or use modCount mechanics in AbstractList, but does need to check for concurrent modification using similar mechanics. On each operation, the array that we expect the backing list to use is checked and updated. Since we do this for all of the base operations invoked by those defined in AbstractList, all is well. While inefficient, this is not worth improving. The kinds of list operations inherited from AbstractList are already so slow on COW sublists that adding a bit more space/time doesn't seem even noticeable.

        if (messageClients == null)
        {
            synchronized (lock)
            {
                if (messageClients == null)
                    messageClients = new CopyOnWriteArrayList();
            }
        }
        
        if (messageClients.addIfAbsent(messageClient))
        {

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            if (attributeListeners == null)
            {
                synchronized (lock)
                {
                    if (attributeListeners == null)
                        attributeListeners = new CopyOnWriteArrayList();
                }
            }
            
            attributeListeners.addIfAbsent(listener);
        }

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            if (destroyedListeners == null)
            {
                synchronized (lock)
                {
                    if (destroyedListeners == null)
                        destroyedListeners = new CopyOnWriteArrayList();
                }
            }
            
            destroyedListeners.addIfAbsent(listener);
        }

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        if (messageClients == null)
        {
            synchronized (lock)
            {
                if (messageClients == null)
                    messageClients = new CopyOnWriteArrayList();
            }
        }
        
        if (messageClients.addIfAbsent(messageClient))
            messageClient.addMessageClientDestroyedListener(this);

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            if (destroyedListeners == null)
            {
                synchronized (lock)
                {
                    if (destroyedListeners == null)
                        destroyedListeners = new CopyOnWriteArrayList();
                }
            }
                        
            destroyedListeners.addIfAbsent(listener);
        }

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