Java tutorial
/* * ==================================================================== * This file is part of the ebXML Registry by Icar Cnr v3.2 * ("eRICv32" in the following disclaimer). * * "eRICv32" is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * "eRICv32" is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License Version 3 * along with "eRICv32". If not, see <http://www.gnu.org/licenses/>. * * eRICv32 is a forked, derivative work, based on: * - freebXML Registry, a royalty-free, open source implementation of the ebXML Registry standard, * which was published under the "freebxml License, Version 1.1"; * - ebXML OMAR v3.2 Edition, published under the GNU GPL v3 by S. Krushe & P. Arwanitis. * * All derivative software changes and additions are made under * * Copyright (C) 2013 Ing. Antonio Messina <messina@pa.icar.cnr.it> * * This software consists of voluntary contributions made by many * individuals on behalf of the freebxml Software Foundation. For more * information on the freebxml Software Foundation, please see * "http://www.freebxml.org/". * * This product includes software developed by the Apache Software * Foundation (http://www.apache.org/). * * ==================================================================== */ package it.cnr.icar.eric.server.query.federation; import it.cnr.icar.eric.client.xml.registry.BulkResponseImpl; import it.cnr.icar.eric.client.xml.registry.ClientRequestContext; import it.cnr.icar.eric.client.xml.registry.ConnectionImpl; import it.cnr.icar.eric.client.xml.registry.DeclarativeQueryManagerImpl; import it.cnr.icar.eric.common.BindingUtility; import it.cnr.icar.eric.common.IterativeQueryParams; import it.cnr.icar.eric.server.common.ConnectionManager; import it.cnr.icar.eric.server.common.ServerRequestContext; import it.cnr.icar.eric.server.util.ServerResourceBundle; import java.util.HashMap; import java.util.Map; import javax.xml.registry.Connection; import javax.xml.registry.JAXRException; import javax.xml.registry.RegistryService; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import javax.xml.registry.RegistryException; import org.oasis.ebxml.registry.bindings.query.AdhocQueryRequest; import org.oasis.ebxml.registry.bindings.query.AdhocQueryResponse; import org.oasis.ebxml.registry.bindings.query.ResponseOptionType.ReturnType; import org.oasis.ebxml.registry.bindings.rim.RegistryType; import org.oasis.ebxml.registry.bindings.rim.UserType; import java.util.concurrent.BrokenBarrierException; //import EDU.oswego.cs.dl.util.concurrent.BrokenBarrierException; //import EDU.oswego.cs.dl.util.concurrent.CyclicBarrier; import java.util.concurrent.CyclicBarrier; /** * Handles dispatching of a federated query to a registry and processes its results. * * @author Fabian Ritzmann * @author <a href="mailto:Farrukh.Najmi@Sun.COM">Farrukh S. Najmi</a> */ public class FederatedQueryWorker implements Runnable { private static Log log = LogFactory.getLog(FederatedQueryWorker.class); BindingUtility bu = BindingUtility.getInstance(); private final CyclicBarrier barrier; private final RegistryType registry; private final long timeout; private final UserType user; private final AdhocQueryRequest queryRequest; private AdhocQueryResponse response = null; private Exception exception = null; private Map<String, Object> repositoryItemsMap = null; protected DeclarativeQueryManagerImpl dqm = null; protected Connection connection = null; /** * TODO Document me */ FederatedQueryWorker(java.util.concurrent.CyclicBarrier barrier2, RegistryType destination, long timeout, UserType user, AdhocQueryRequest partAdhocQueryRequest) { this.barrier = barrier2; this.registry = destination; this.timeout = timeout; this.user = user; this.queryRequest = partAdhocQueryRequest; } /* * @see java.lang.Runnable#run() */ public void run() { try { setUpConnection(); // Send the actual request here AdhocQueryResponse result = sendRequestToDestination(registry, user, queryRequest, timeout); this.response = result; // And return the result // We are not using a timeout here. A timeout should only happen if we have a lingering request // and we need to stop such requests before entering the rendezous, // otherwise we will accumulate hanging threads. //barrier.barrier(); barrier.await(); } catch (BrokenBarrierException e) { // Well, I cannot think of anything to do here except log a big, fat error. } catch (RegistryException re) { try { // If the request failed, return the exception instead of a result this.exception = re; //barrier.barrier(); barrier.await(); } catch (InterruptedException | BrokenBarrierException ie) { // log this } } catch (JAXRException re) { try { // If the request failed, return the exception instead of a result this.exception = re; //barrier.barrier(); barrier.await(); } catch (InterruptedException | BrokenBarrierException ie) { // log this } } catch (InterruptedException ie) { // log this } } /** * @param registry * @param user * @param queryRequest * @param timeout * @return */ @SuppressWarnings("static-access") private AdhocQueryResponse sendRequestToDestination(RegistryType registry, UserType user, AdhocQueryRequest queryRequest, long timeout) throws RegistryException { AdhocQueryResponse resp = null; try { /* AdhocQueryType ahq = queryRequest.getAdhocQuery(); QueryExpressionType queryExp = ahq.getQueryExpression(); String queryLang = queryExp.getQueryLanguage(); String queryStr = (String)queryExp.getContent().get(0); Query query = null; if (queryLang.equals(BindingUtility.CANONICAL_QUERY_LANG_ID_SQL_92)) { query = dqm.createQuery(Query.QUERY_TYPE_SQL, queryStr); } else { //TODO: filter query throw new JAXRException("No support for Query Language: " + queryLang + " in persistent queries."); } */ //If registry is local (connection == null) then use local call. //Otherwise use JAXR connection / SOAP if (connection == null) { try { it.cnr.icar.eric.common.spi.QueryManager qm = it.cnr.icar.eric.common.spi.QueryManagerFactory .getInstance().getQueryManager(); ServerRequestContext context = new ServerRequestContext( "FederatedQueryWorker:sendRequestToDestination", queryRequest); context.setUser(user); resp = qm.submitAdhocQuery(context); repositoryItemsMap = new HashMap<String, Object>(); } catch (JAXRException e) { String msg = ServerResourceBundle.getInstance().getString("message.error.localQuery", new Object[] { registry.getId(), bu.getInternationalStringAsString(registry.getName()) }); throw new RegistryException(msg, e); } } else { //Using impl specific convenient constructor try { HashMap<String, String> queryParams = new HashMap<String, String>(); String returnType = ReturnType.LEAF_CLASS_WITH_REPOSITORY_ITEM.toString(); queryParams.put(dqm.CANONICAL_SLOT_RESPONSEOPTION_RETURN_TYPE, returnType); ClientRequestContext context = new ClientRequestContext( "it.cnr.icar.eric.client.xml.registry.DeclarativeQueryManagerImpl:executeQuery", queryRequest); BulkResponseImpl br = (BulkResponseImpl) dqm.executeQuery(context, queryParams, new IterativeQueryParams()); log.trace("Registry id: " + registry.getId() + " name: " + bu.getInternationalStringAsString(registry.getName()) + " returned the following objects: " + br.getCollection()); resp = (AdhocQueryResponse) br.getRegistryResponse(); bu.convertRepositoryItemMapForServer(context.getRepositoryItemsMap()); this.repositoryItemsMap = context.getRepositoryItemsMap(); } catch (Exception e) { String msg = ServerResourceBundle.getInstance().getString("message.error.remoteQuery", new Object[] { registry.getId(), bu.getInternationalStringAsString(registry.getName()) }); throw new RegistryException(msg, e); } } } catch (JAXRException e) { //This exception is thrown potentially (unlikely) by bu.getInternationalStringAsString throw new RegistryException(e); } return resp; } /** * @return */ public Exception getException() { return this.exception; } /** * @return */ public AdhocQueryResponse getResponse() { return this.response; } public Map<String, Object> getRepositoryItemsMap() { return this.repositoryItemsMap; } /** Setup JAXR Connection for target registry */ protected void setUpConnection() throws JAXRException { String home = registry.getHome(); if ((home != null) && (connection == null)) { connection = ConnectionManager.getInstance().getConnection(home); ((ConnectionImpl) connection).setLocalCallMode(false); RegistryService service = connection.getRegistryService(); dqm = (DeclarativeQueryManagerImpl) service.getDeclarativeQueryManager(); } } }