Java tutorial
/* Copyright 2008-2010 Gephi Authors : Mathieu Bastian <mathieu.bastian@gephi.org>, Andre Panisson <panisson@gmail.com> Website : http://www.gephi.org This file is part of Gephi. DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. Copyright 2011 Gephi Consortium. All rights reserved. The contents of this file are subject to the terms of either the GNU General Public License Version 3 only ("GPL") or the Common Development and Distribution License("CDDL") (collectively, the "License"). You may not use this file except in compliance with the License. You can obtain a copy of the License at http://gephi.org/about/legal/license-notice/ or /cddl-1.0.txt and /gpl-3.0.txt. See the License for the specific language governing permissions and limitations under the License. When distributing the software, include this License Header Notice in each file and include the License files at /cddl-1.0.txt and /gpl-3.0.txt. If applicable, add the following below the License Header, with the fields enclosed by brackets [] replaced by your own identifying information: "Portions Copyrighted [year] [name of copyright owner]" If you wish your version of this file to be governed by only the CDDL or only the GPL Version 3, indicate your decision by adding "[Contributor] elects to include this software in this distribution under the [CDDL or GPL Version 3] license." If you do not indicate a single choice of license, a recipient has the option to distribute your version of this file under either the CDDL, the GPL Version 3 or to extend the choice of license to its licensees as provided above. However, if you add GPL Version 3 code and therefore, elected the GPL Version 3 license, then the option applies only if the new code is made subject to such option by the copyright holder. Contributor(s): Portions Copyrighted 2011 Gephi Consortium. */ package org.gephi.streaming.impl; import java.io.IOException; import java.io.OutputStream; import java.net.Authenticator; import java.net.HttpURLConnection; import java.net.PasswordAuthentication; import java.net.URL; import java.net.URLConnection; import java.net.UnknownServiceException; import java.util.Collection; import java.util.Date; import java.util.HashSet; import java.util.Set; import java.util.logging.Level; import java.util.logging.Logger; import org.apache.commons.codec.binary.Base64; import org.gephi.data.attributes.api.AttributeController; import org.gephi.graph.api.Graph; import org.gephi.streaming.api.Graph2EventListener; import org.gephi.streaming.api.GraphEventHandler; import org.gephi.streaming.api.StreamingEndpoint; import org.gephi.streaming.api.GraphUpdaterEventHandler; import org.gephi.streaming.api.Report; import org.gephi.streaming.api.StreamReader; import org.gephi.streaming.api.StreamReaderFactory; import org.gephi.streaming.api.StreamType; import org.gephi.streaming.api.StreamWriter; import org.gephi.streaming.api.StreamWriterFactory; import org.gephi.streaming.api.StreamingConnection; import org.gephi.streaming.api.StreamingController; import org.gephi.streaming.api.event.ElementEvent; import org.gephi.streaming.api.event.ElementType; import org.gephi.streaming.api.event.EventType; import org.gephi.streaming.api.event.GraphEvent; import org.gephi.streaming.api.event.GraphEventBuilder; import org.openide.util.Lookup; import org.openide.util.lookup.ServiceProvider; /** * * @author panisson */ @ServiceProvider(service = StreamingController.class) public class StreamingControllerImpl implements StreamingController { private static final Logger logger = Logger.getLogger(StreamingControllerImpl.class.getName()); @Override public StreamType getStreamType(String streamType) { Collection<? extends StreamType> streamTypes = Lookup.getDefault().lookupAll(StreamType.class); for (StreamType type : streamTypes) { if (type.getType().equalsIgnoreCase(streamType)) { return type; } } return null; } @Override public StreamingConnection connect(StreamingEndpoint endpoint, Graph graph) throws IOException { return connect(endpoint, graph, new Report()); } @Override public StreamingConnection connect(StreamingEndpoint endpoint, final Graph graph, Report report) throws IOException { logger.log(Level.FINE, "Connecting to url {0}", endpoint.getUrl().toString()); final Set<FilteredEventEntry> filterededIds = new HashSet<FilteredEventEntry>(); // Register listener for graph events ClientEventHandler handler = new ClientEventHandler(endpoint, filterededIds); final Graph2EventListener graph2EventListener = new Graph2EventListener(graph, handler); graph.getModel().addGraphListener(graph2EventListener); AttributeController ac = Lookup.getDefault().lookup(AttributeController.class); ac.getModel().addAttributeListener(graph2EventListener); if (report != null) { report.setSource(endpoint.getUrl().toString()); } // Connect to stream final GraphUpdaterEventHandler graphUpdaterHandler = new GraphUpdaterEventHandler(graph); graphUpdaterHandler.setReport(report); GraphEventHandler filteredHandler = new GraphEventHandler() { @Override public void handleGraphEvent(GraphEvent event) { logger.log(Level.INFO, "Received event {0}", event.toString()); if (event instanceof ElementEvent) { ElementEvent elementEvent = (ElementEvent) event; if (elementEvent.getElementId() != null) { filterededIds.add(new FilteredEventEntry(elementEvent.getElementId(), elementEvent.getElementType(), 0)); } } graphUpdaterHandler.handleGraphEvent(event); } }; final GraphEventContainer container = new GraphEventContainer(filteredHandler); GraphEventBuilder eventBuilder = new GraphEventBuilder(endpoint.getUrl()); StreamReaderFactory readerFactory = Lookup.getDefault().lookup(StreamReaderFactory.class); StreamReader reader = readerFactory.createStreamReader(endpoint.getStreamType(), container, eventBuilder); reader.setReport(report); StreamingConnection connection = new StreamingConnectionImpl(endpoint, reader, report); connection.addStatusListener(new StreamingConnection.StatusListener() { @Override public void onConnectionClosed(StreamingConnection connection) { graph.getModel().removeGraphListener(graph2EventListener); AttributeController ac = Lookup.getDefault().lookup(AttributeController.class); ac.getModel().removeAttributeListener(graph2EventListener); container.waitForDispatchAllEvents(); container.stop(); logger.log(Level.INFO, "Connecion closed"); } @Override public void onDataReceived(StreamingConnection connection) { } @Override public void onError(StreamingConnection connection) { } }); logger.log(Level.INFO, "Connected to url {0}", endpoint.getUrl().toString()); return connection; } private class ClientEventHandler implements GraphEventHandler { private StreamingEndpoint endpoint; private Set<FilteredEventEntry> filteredEvents; public ClientEventHandler(StreamingEndpoint endpoint, Set<FilteredEventEntry> filterededEvents) { this.endpoint = endpoint; this.filteredEvents = filterededEvents; } @Override public void handleGraphEvent(GraphEvent event) { logger.log(Level.INFO, "{0};{1};Sending event {2}", new Object[] { Thread.currentThread().getId(), System.currentTimeMillis(), event.toString() }); if (event instanceof ElementEvent) { ElementEvent elementEvent = (ElementEvent) event; FilteredEventEntry entry = new FilteredEventEntry(elementEvent.getElementId(), elementEvent.getElementType(), 0); if (!filteredEvents.contains(entry)) { sendEvent(endpoint, event); } else { filteredEvents.remove(entry); } } } } private void sendEvent(final StreamingEndpoint endpoint, GraphEvent event) { logger.log(Level.FINE, "Sending event {0}", event.toString()); try { URL url = new URL(endpoint.getUrl(), endpoint.getUrl().getFile() + "?operation=updateGraph&format=" + endpoint.getStreamType().getType()); URLConnection connection = url.openConnection(); // Workaround for Bug https://issues.apache.org/jira/browse/CODEC-89 String base64Encoded = Base64 .encodeBase64String((endpoint.getUser() + ":" + endpoint.getPassword()).getBytes()); base64Encoded = base64Encoded.replaceAll("\r\n?", ""); connection.setRequestProperty("Authorization", "Basic " + base64Encoded); connection.setDoOutput(true); connection.connect(); StreamWriterFactory writerFactory = Lookup.getDefault().lookup(StreamWriterFactory.class); OutputStream out = null; try { out = connection.getOutputStream(); } catch (UnknownServiceException e) { // protocol doesn't support output return; } StreamWriter writer = writerFactory.createStreamWriter(endpoint.getStreamType(), out); writer.handleGraphEvent(event); out.flush(); out.close(); connection.getInputStream().close(); } catch (IOException ex) { logger.log(Level.FINE, null, ex); } } private class FilteredEventEntry { private final String elementId; private final ElementType elementType; private final long timestamp; public FilteredEventEntry(String elementId, ElementType elementType, long timestamp) { this.elementId = elementId; this.elementType = elementType; if (timestamp <= 0) { this.timestamp = System.currentTimeMillis(); } else { this.timestamp = timestamp; } } @Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null || obj.getClass() != this.getClass()) return false; FilteredEventEntry e = (FilteredEventEntry) obj; return this.elementType == e.elementType && this.elementId.equals(e.elementId); } @Override public int hashCode() { return this.elementType.hashCode() * 31 + this.elementId.hashCode(); } } }