Examples of org.jboss.dna.graph.request.CompositeRequestChannel

org.jboss.dna.graph.request.CompositeRequestChannel
A channel for Request objects that can be submitted to a consumer (typically a {@link RequestProcessor} or{@link RepositoryConnection}) while allowing the channel owner to continue adding more Request objects into the channel.
The owner of this channel is responsible for starting the processing using one of the two start(...) methods, adding {@link Request}s via add(...) methods, {@link #close() closing} the channel when there are no more requeststo be added, and finally {@link #await() awaiting} until all of the submitted requests have been processed. Note that the ownercan optionally pre-fill the channel with Request objects before calling start(...).

The consumer will be handed a {@link CompositeRequest}, and should use the {@link CompositeRequest#iterator()} method to obtainan Iterator<Request>. The {@link Iterator#hasNext()} method will block until there is another Request available in thechannel, or until the channel is closed (at which point {@link Iterator#hasNext()} will return false. (Notice that the{@link Iterator#next()} method will also block if it is not preceeded by a {@link Iterator#hasNext()}, but will throw a {@link NoSuchElementException} when there are no more Request objects and the channel is closed.)

Because the CompositeRequest's iterator will block, the consumer will block while processing the request. Therefore, this channel submits the CompositeRequest to the consumer asynchronously, via an {@link ExecutorService} supplied in one of the two{@link #start(ExecutorService,ExecutionContext,RepositoryConnectionFactory) start}{@link #start(ExecutorService,RequestProcessor,boolean) methods}.

        CheckArg.isNotNull(connectionFactory, "connectionFactory");
        this.context = context;
        this.searchEngine = searchEngine;
        this.sourceName = searchEngine.getSourceName();
        this.connectionFactory = connectionFactory;
        this.channel = new CompositeRequestChannel(this.sourceName);
        this.service = Executors.newSingleThreadExecutor(new NamedThreadFactory("search-" + sourceName));
        // Start the channel and search engine processor right away (this is why this object must be closed)
        this.channel.start(service, this.context, this.connectionFactory);
        this.processor = this.searchEngine.createProcessor(this.context, null, false);
    }

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                } finally {
                    searchProcessor.close();
                }
            } else if (request instanceof CompositeRequest) {
                CompositeRequest composite = (CompositeRequest)request;
                CompositeRequestChannel channel = null;
                RequestProcessor searchProcessor = null;
                try {
                    for (Request nested : composite) {
                        if (nested instanceof AccessQueryRequest) {
                            AccessQueryRequest queryRequest = (AccessQueryRequest)request;
                            if (searchProcessor == null) searchProcessor = searchEngine().createProcessor(context, null, true);
                            searchProcessor.process(queryRequest);
                        } else if (nested instanceof FullTextSearchRequest) {
                            FullTextSearchRequest searchRequest = (FullTextSearchRequest)request;
                            if (searchProcessor == null) searchProcessor = searchEngine().createProcessor(context, null, true);
                            searchProcessor.process(searchRequest);
                        } else {
                            // Delegate to the channel ...
                            if (channel == null) {
                                // Create a connection factory that always returns the delegate connection ...
                                RepositoryConnectionFactory connectionFactory = new RepositoryConnectionFactory() {
                                    /**
                                     * {@inheritDoc}
                                     * 
                                     * @see org.jboss.dna.graph.connector.RepositoryConnectionFactory#createConnection(java.lang.String)
                                     */
                                    public RepositoryConnection createConnection( String sourceName )
                                        throws RepositorySourceException {
                                        assert delegate().getName().equals(sourceName);
                                        return delegateConnection();
                                    }
                                };
                                channel = new CompositeRequestChannel(delegate().getName());
                                channel.start(executorService, context, connectionFactory);
                            }
                            channel.add(request);
                        }
                    }
                } finally {
                    try {
                        if (searchProcessor != null) {
                            searchProcessor.close();
                        }
                    } finally {
                        if (channel != null) {
                            try {
                                channel.close();
                            } finally {
                                try {
                                    channel.await();
                                } catch (CancellationException err) {
                                    composite.cancel();
                                } catch (ExecutionException err) {
                                    composite.setError(err);
                                } catch (InterruptedException err) {

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     * @see #submit(Request, String, CountDownLatch)
     */
    protected void submitAndAwait( Request request,
                                   String sourceName ) throws InterruptedException {
        assert request != null;
        CompositeRequestChannel channel = channelBySourceName.get(sourceName);
        if (channel == null) {
            channel = new CompositeRequestChannel(sourceName);
            channelBySourceName.put(sourceName, channel);
            channel.start(executor, getExecutionContext(), connectionFactory);
        }
        channel.addAndAwait(request);
    }

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     */
    protected void submit( Request request,
                           String sourceName,
                           CountDownLatch latch ) {
        assert request != null;
        CompositeRequestChannel channel = channelBySourceName.get(sourceName);
        if (channel == null) {
            channel = new CompositeRequestChannel(sourceName);
            channelBySourceName.put(sourceName, channel);
            channel.start(executor, getExecutionContext(), connectionFactory);
        }
        channel.add(request, latch);
    }

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     * @see #submit(Request, String, CountDownLatch)
     */
    protected void submit( Request request,
                           String sourceName ) {
        assert request != null;
        CompositeRequestChannel channel = channelBySourceName.get(sourceName);
        if (channel == null) {
            channel = new CompositeRequestChannel(sourceName);
            channelBySourceName.put(sourceName, channel);
            channel.start(executor, getExecutionContext(), connectionFactory);
        }
        channel.add(request);
    }

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Related Classes of org.jboss.dna.graph.request.CompositeRequestChannel

org.jboss.dna.graph.connector.federation.ForkRequestProcessor

org.jboss.dna.graph.connector.RepositoryConnection

org.jboss.dna.graph.search.SearchableRepositorySource$ParallelConnection

org.jboss.dna.graph.search.SearchEngineIndexer

java.util.NoSuchElementException

java.util.concurrent.CountDownLatch

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