Examples of edu.emory.mathcs.backport.java.util.concurrent.CopyOnWriteArraySet

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

Examples of edu.emory.mathcs.backport.java.util.concurrent.CopyOnWriteArraySet

edu.emory.mathcs.backport.java.util.concurrent.CopyOnWriteArraySet
A {@link java.util.Set} that uses an internal {@link CopyOnWriteArrayList}for all of its operations. Thus, it shares the same basic properties:
- It is best suited for applications in which set sizes generally stay small, read-only operations vastly outnumber mutative operations, and you need to prevent interference among threads during traversal.
- It is thread-safe.
- Mutative operations (add, set, remove, etc.) are expensive since they usually entail copying the entire underlying array.
- Iterators do not support the mutative remove operation.
- Traversal via iterators is fast and cannot encounter interference from other threads. Iterators rely on unchanging snapshots of the array at the time the iterators were constructed.
Sample Usage. The following code sketch uses a copy-on-write set to maintain a set of Handler objects that perform some action upon state updates.
```
 class Handler { void handle(); ... } class X { private final CopyOnWriteArraySet<Handler> handlers = new CopyOnWriteArraySet<Handler>(); public void addHandler(Handler h) { handlers.add(h); } private long internalState; private synchronized void changeState() { internalState = ...; } public void update() { changeState(); for (Handler handler : handlers) handler.handle(); } } 
```
This class is a member of the Java Collections Framework. @see CopyOnWriteArrayList @since 1.5 @author Doug Lea


    private void addRemotePacket(String containerName, ComponentPacket packet) {
        networkComponentKeyMap.put(packet.getComponentNameSpace(), containerName);
        Set set = (Set) networkNodeKeyMap.get(containerName);
        if (set == null) {
            set = new CopyOnWriteArraySet();
            networkNodeKeyMap.put(containerName, set);
        }
        ComponentConnector cc = new ComponentConnector(packet);
        log.info("Adding Remote Component: " + cc);
        broker.getRegistry().addRemoteComponentConnector(cc);

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    private void addRemotePacket(Destination nodeName, ComponentPacket packet) {
        clusterComponentKeyMap.put(packet.getComponentNameSpace(), nodeName);
        Set set = (Set) clusterNodeKeyMap.get(nodeName);
        if (set == null) {
            set = new CopyOnWriteArraySet();
            clusterNodeKeyMap.put(nodeName, set);
            ComponentConnector cc = new ComponentConnector(packet);
            log.info("Adding Remote Component: " + cc);
            broker.getRegistry().addRemoteComponentConnector(cc);
        }

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    private void addRemotePacket(String containerName, ComponentPacket packet) {
        networkComponentKeyMap.put(packet.getComponentNameSpace(), containerName);
        Set set = (Set) networkNodeKeyMap.get(containerName);
        if (set == null) {
            set = new CopyOnWriteArraySet();
            networkNodeKeyMap.put(containerName, set);
        }
        ComponentConnector cc = new ComponentConnector(packet);
        log.info("Adding Remote Component: " + cc);
        broker.getRegistry().addRemoteComponentConnector(cc);

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    public void stop() throws Exception {
        this.subscriptionRecoveryPolicy.stop();
    }
    
    public Message[] browse(){
        final Set result=new CopyOnWriteArraySet();
        try{
            if(store!=null){
                store.recover(new MessageRecoveryListener(){
                    public void recoverMessage(Message message) throws Exception{
                        result.add(message);
                    }


                    public void recoverMessageReference(String messageReference) throws Exception{}


                    public void finished(){}
                });
                Message[] msgs=subscriptionRecoveryPolicy.browse(getActiveMQDestination());
                if(msgs!=null){
                    for(int i=0;i<msgs.length;i++){
                        result.add(msgs[i]);
                    }
                }
            }
        }catch(Throwable e){
            log.warn("Failed to browse Topic: "+getActiveMQDestination().getPhysicalName(),e);
        }
        return (Message[]) result.toArray(new Message[result.size()]);
    }

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    private Set flowLinks;
    
    public DotViewFlowListener() {
        setFile("ServiceMixFlow.dot");
        flow = new ConcurrentHashMap();
        flowLinks = new CopyOnWriteArraySet();
    }

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    private boolean displayComponents = true;
    
    public DotViewFlowListener() {
        setFile("ServiceMixFlow.dot");
        flow = new ConcurrentHashMap();
        flowLinks = new CopyOnWriteArraySet();
        usedComponents = new CopyOnWriteArraySet();
        componentsAsConsumer = new CopyOnWriteArraySet();
    }

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    public void stop() throws Exception {
        this.subscriptionRecoveryPolicy.stop();
    }
    
    public Message[] browse(){
        final Set result=new CopyOnWriteArraySet();
        try{
            if(store!=null){
                store.recover(new MessageRecoveryListener(){
                    public void recoverMessage(Message message) throws Exception{
                        result.add(message);
                    }


                    public void recoverMessageReference(String messageReference) throws Exception{}


                    public void finished(){}
                });
                Message[] msgs=subscriptionRecoveryPolicy.browse(getActiveMQDestination());
                if(msgs!=null){
                    for(int i=0;i<msgs.length;i++){
                        result.add(msgs[i]);
                    }
                }
            }
        }catch(Throwable e){
            log.warn("Failed to browse Topic: "+getActiveMQDestination().getPhysicalName(),e);
        }
        return (Message[]) result.toArray(new Message[result.size()]);
    }

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