Java tutorial
/* ************************************************************************ ******************* CANADIAN ASTRONOMY DATA CENTRE ******************* ************** CENTRE CANADIEN DE DONNES ASTRONOMIQUES ************** * * (c) 2009. (c) 2009. * Government of Canada Gouvernement du Canada * National Research Council Conseil national de recherches * Ottawa, Canada, K1A 0R6 Ottawa, Canada, K1A 0R6 * All rights reserved Tous droits rservs * * NRC disclaims any warranties, Le CNRC dnie toute garantie * expressed, implied, or nonce, implicite ou lgale, * statutory, of any kind with de quelque nature que ce * respect to the software, soit, concernant le logiciel, * including without limitation y compris sans restriction * any warranty of merchantability toute garantie de valeur * or fitness for a particular marchande ou de pertinence * purpose. NRC shall not be pour un usage particulier. * liable in any event for any Le CNRC ne pourra en aucun cas * damages, whether direct or tre tenu responsable de tout * indirect, special or general, dommage, direct ou indirect, * consequential or incidental, particulier ou gnral, * arising from the use of the accessoire ou fortuit, rsultant * software. Neither the name de l'utilisation du logiciel. Ni * of the National Research le nom du Conseil National de * Council of Canada nor the Recherches du Canada ni les noms * names of its contributors may de ses participants ne peuvent * be used to endorse or promote tre utiliss pour approuver ou * products derived from this promouvoir les produits drivs * software without specific prior de ce logiciel sans autorisation * written permission. pralable et particulire * par crit. * * This file is part of the Ce fichier fait partie du projet * OpenCADC project. OpenCADC. * * OpenCADC is free software: OpenCADC est un logiciel libre ; * you can redistribute it and/or vous pouvez le redistribuer ou le * modify it under the terms of modifier suivant les termes de * the GNU Affero General Public la GNU Affero General Public * License as published by the License? telle que publie * Free Software Foundation, par la Free Software Foundation * either version 3 of the : soit la version 3 de cette * License, or (at your option) licence, soit ( votre gr) * any later version. toute version ultrieure. * * OpenCADC is distributed in the OpenCADC est distribu * hope that it will be useful, dans lespoir quil vous * but WITHOUT ANY WARRANTY; sera utile, mais SANS AUCUNE * without even the implied GARANTIE : sans mme la garantie * warranty of MERCHANTABILITY implicite de COMMERCIALISABILIT * or FITNESS FOR A PARTICULAR ni dADQUATION UN OBJECTIF * PURPOSE. See the GNU Affero PARTICULIER. Consultez la Licence * General Public License for Gnrale Publique GNU Affero * more details. pour plus de dtails. * * You should have received Vous devriez avoir reu une * a copy of the GNU Affero copie de la Licence Gnrale * General Public License along Publique GNU Affero avec * with OpenCADC. If not, see OpenCADC ; si ce nest * <http://www.gnu.org/licenses/>. pas le cas, consultez : * <http://www.gnu.org/licenses/>. * * $Revision: 4 $ * ************************************************************************ */ package ca.nrc.cadc.vosi.avail; import ca.nrc.cadc.vosi.VOSI; import ca.nrc.cadc.vosi.util.WebGet; import ca.nrc.cadc.xml.XmlUtil; import org.apache.log4j.Logger; import org.jdom2.Document; import org.jdom2.Element; import org.jdom2.JDOMException; import org.jdom2.Namespace; import org.jdom2.filter.Filters; import org.jdom2.xpath.XPathBuilder; import org.jdom2.xpath.XPathExpression; import org.jdom2.xpath.XPathFactory; import java.io.IOException; import java.io.StringReader; import java.net.MalformedURLException; import java.util.HashMap; import java.util.Map; /** * Check the /availability resource of another web service. * * @author zhangsa * */ public class CheckWebService implements CheckResource { private static Logger log = Logger.getLogger(CheckWebService.class); private Map<String, String> schemaMap = new HashMap<String, String>(); private String wsURL; /** * @param url the URL of availability checking, e.g. http://www.sample.com/myservice/availability */ public CheckWebService(String url) { wsURL = url; this.schemaMap.put(VOSI.AVAILABILITY_NS_URI, XmlUtil.getResourceUrlString(VOSI.AVAILABILITY_SCHEMA, CheckWebService.class)); } /* (non-Javadoc) * @see java.lang.Runnable#run() */ @Override public void check() throws CheckException { String wgReturn = null; try { WebGet webGet = new WebGet(wsURL); wgReturn = webGet.submit(); checkReturnedXml(wgReturn); log.debug("test succeeded: " + wsURL); } catch (MalformedURLException e) { log.warn("test failed: " + wsURL); throw new RuntimeException("test URL is malformed: " + wsURL, e); } catch (IOException e) { log.warn("test failed: " + wsURL); throw new CheckException("service not responding: " + wsURL, e); } } void checkReturnedXml(String strXml) throws CheckException { Document doc; String xpathStr; try { StringReader reader = new StringReader(strXml); doc = XmlUtil.buildDocument(reader, schemaMap); //get namespace and/or prefix from Document, then create xpath based on the prefix String nsp = doc.getRootElement().getNamespacePrefix(); //Namespace Prefix if (nsp != null && nsp.length() > 0) nsp = nsp + ":"; else nsp = ""; xpathStr = "/" + nsp + "availability/" + nsp + "available"; XPathBuilder<Element> builder = new XPathBuilder<Element>(xpathStr, Filters.element()); Namespace ns = Namespace.getNamespace(VOSI.NS_PREFIX, VOSI.AVAILABILITY_NS_URI); builder.setNamespace(ns); XPathExpression<Element> xpath = builder.compileWith(XPathFactory.instance()); Element eleAvail = xpath.evaluateFirst(doc); log.debug(eleAvail); String textAvail = eleAvail.getText(); // TODO: is this is actually valid? is the content not constrained by the schema? if (textAvail == null) throw new CheckException(wsURL + " output is invalid: no content in <available> element", null); if (!textAvail.equalsIgnoreCase("true")) { xpathStr = "/" + nsp + "availability/" + nsp + "note"; builder = new XPathBuilder<Element>(xpathStr, Filters.element()); builder.setNamespace(ns); xpath = builder.compileWith(XPathFactory.instance()); Element eleNotes = xpath.evaluateFirst(doc); String textNotes = eleNotes.getText(); throw new CheckException("service " + wsURL + " is not available, reported reason: " + textNotes, null); } } catch (IOException e) { // probably an incorrect setup or bug in the checks throw new RuntimeException("failed to test " + wsURL, e); } catch (JDOMException e) { throw new CheckException(wsURL + " output is invalid", e); } } }