Java tutorial
/** * Copyright 2010-2015 Complex and Distributed IT Systems, TU Berlin * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package de.tu_berlin.cit.intercloud.xmpp.component; import java.util.ArrayList; import org.dom4j.Document; import org.dom4j.DocumentHelper; import org.dom4j.Element; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import de.tu_berlin.cit.intercloud.occi.core.OcciContainer; import de.tu_berlin.cit.intercloud.xmpp.core.component.AbstractComponent; import de.tu_berlin.cit.intercloud.xmpp.core.packet.IQ; import de.tu_berlin.cit.intercloud.xmpp.core.packet.Packet; import de.tu_berlin.cit.intercloud.xmpp.rest.ResourceContainer; import de.tu_berlin.cit.intercloud.xmpp.rest.xml.ResourceDocument; import de.tu_berlin.cit.intercloud.xmpp.rest.xwadl.ResourceTypeDocument; /** * TODO * * @author Alexander Stanik <alexander.stanik@tu-berlin.de> */ public abstract class ResourceContainerComponent extends AbstractComponent { protected final static Logger logger = LoggerFactory.getLogger(ResourceContainerComponent.class); /** * The 'XWADL' namespace * */ public static final String NAMESPACE_REST_XWADL = "urn:xmpp:rest-xwadl"; /** * The 'REST XML' namespace * */ public static final String NAMESPACE_REST_XML = "urn:xmpp:xml-rest"; private final ResourceContainer container; private final ResourceContainerSocketManager socketManager; /** * Optimal container component configuration: 24 threads, queue 100,000 * @param container */ protected ResourceContainerComponent(ResourceContainer container) { super(24, 100000, true); this.container = container; this.socketManager = ResourceContainerSocketManager.buildInstance(this); } @Override protected String[] discoInfoFeatureNamespaces() { ArrayList<String> features = new ArrayList<String>(); features.add(NAMESPACE_REST_XWADL); features.add(NAMESPACE_REST_XML); if (this.container instanceof OcciContainer) { features.addAll(((OcciContainer) this.container).getSupportedTypes()); } return features.toArray(new String[0]); } @Override protected String discoInfoIdentityCategory() { return ("automation"); } @Override protected String discoInfoIdentityCategoryType() { return ("rest"); } /** * Override this method to handle the IQ stanzas of type <tt>get</tt> that * could not be processed by the {@link AbstractComponent} implementation. * * Note that, as any IQ stanza of type <tt>get</tt> must be replied to, * returning <tt>null</tt> from this method equals returning an IQ error * stanza of type 'feature-not-implemented' (this behavior can be disabled * by setting the <tt>enforceIQResult</tt> argument in the constructor to * <tt>false</tt>). * * Note that if this method throws an Exception, an IQ stanza of type * <tt>error</tt>, condition 'internal-server-error' will be returned to the * sender of the original request. * * The default implementation of this method returns <tt>null</tt>. It is * expected that most child classes will override this method. * * @param iq * The IQ request stanza of type <tt>get</tt> that was received * by this component. * @return the response the to request stanza, or <tt>null</tt> to indicate * 'feature-not-available'. */ @Override protected IQ handleIQGet(IQ iq) throws Exception { logger.info("the following iq get stanza has been received:" + iq.toString()); Element child = iq.getChildElement(); String path = child.attribute("path").getValue(); ResourceTypeDocument xwadl = this.container.getXWADL(path); Document doc = DocumentHelper.parseText(xwadl.toString()); IQ response = IQ.createResultIQ(iq); response.setChildElement(doc.getRootElement()); logger.info("the following iq result stanza will be send:" + response.toString()); return response; } /** * Override this method to handle the IQ stanzas of type <tt>set</tt> that * could not be processed by the {@link AbstractComponent} implementation. * * Note that, as any IQ stanza of type <tt>set</tt> must be replied to, * returning <tt>null</tt> from this method equals returning an IQ error * stanza of type 'feature-not-implemented' {this behavior can be disabled * by setting the <tt>enforceIQResult</tt> argument in the constructor to * <tt>false</tt>). * * Note that if this method throws an Exception, an IQ stanza of type * <tt>error</tt>, condition 'internal-server-error' will be returned to the * sender of the original request. * * The default implementation of this method returns <tt>null</tt>. It is * expected that most child classes will override this method. * * @param iq * The IQ request stanza of type <tt>set</tt> that was received * by this component. * @return the response the to request stanza, or <tt>null</tt> to indicate * 'feature-not-available'. */ @Override protected IQ handleIQSet(IQ iq) throws Exception { logger.info("the following iq set stanza has been received:" + iq.toString()); Element child = iq.getChildElement(); ResourceDocument xmlRequest = ResourceDocument.Factory.parse(child.asXML()); ResourceDocument xmlResponse = this.container.execute(xmlRequest); Document doc = DocumentHelper.parseText(xmlResponse.toString()); IQ response = IQ.createResultIQ(iq); response.setChildElement(doc.getRootElement()); logger.info("the following iq result stanza will be send:" + response.toString()); return response; } /** * Override this method to handle the IQ stanzas of type <tt>result</tt> * that are received by the component. If you do not override this method, * the stanzas are ignored. * * @param iq * The IQ stanza of type <tt>result</tt> that was received by * this component. */ @Override protected void handleIQResult(IQ iq) { logger.info("the following iq result stanza has been received:" + iq.toString()); this.socketManager.handleIQResult(iq); } /** * Override this method to handle the IQ stanzas of type <tt>error</tt> that * are received by the component. If you do not override this method, the * stanzas are ignored. * * @param iq * The IQ stanza of type <tt>error</tt> that was received by this * component. */ @Override protected void handleIQError(IQ iq) { logger.info("the following iq error stanza has been received:" + iq.toString()); this.socketManager.handleIQError(iq); } /** * Helper method for socket manager to send packets. * * @param packet * The packet to send. */ protected void sendPacket(Packet packet) { send(packet); } }