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/**
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* Copyright: 2013 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat.index;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.InputStream;
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import java.util.ArrayList;
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import java.util.Calendar;
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import java.util.List;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.dataone.service.exceptions.ServiceFailure;
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import org.dataone.service.types.v1.Event;
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import org.dataone.service.types.v1.Identifier;
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import org.dataone.service.types.v1.SystemMetadata;
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import com.hazelcast.core.IMap;
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import com.hazelcast.core.ISet;
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import com.hazelcast.core.ItemEvent;
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import com.hazelcast.core.ItemListener;
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import edu.ucsb.nceas.metacat.common.index.event.IndexEvent;
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import edu.ucsb.nceas.metacat.index.event.EventlogFactory;
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public class SystemMetadataEventListener implements ItemListener<SystemMetadata> {
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private static Log log = LogFactory.getLog(SystemMetadataEventListener.class);
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private SolrIndex solrIndex = null;
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private ISet<SystemMetadata> source = null;
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/**
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* Default constructor - caller needs to initialize manually
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* @see setSolrIndex()
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* @see start()
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*/
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public SystemMetadataEventListener() {
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}
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/**
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* Sets the SolrIndex instance and initializes the listener
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* @param solrIndex
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*/
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public SystemMetadataEventListener(SolrIndex solrIndex) {
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this.solrIndex = solrIndex;
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try {
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start();
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} catch (Exception e) {
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log.error(e.getMessage(), e);
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}
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}
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/**
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* Get the SolrIndex that this listener communicates with
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* @return a SolrIndex instance that indexes the content being listened to
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*/
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public SolrIndex getSolrIndex() {
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return solrIndex;
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}
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/**
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* Set the SolrIndex instance that the listener modifies
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* @param solrIndex
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*/
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public void setSolrIndex(SolrIndex solrIndex) {
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this.solrIndex = solrIndex;
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}
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/**
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* Registers this instance as a system metadata map event listener
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* @throws ServiceFailure
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* @throws FileNotFoundException
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*/
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public void start() throws FileNotFoundException, ServiceFailure {
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// get shared structures and add listener
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IMap<Identifier, String> objectPathMap = DistributedMapsFactory.getObjectPathMap();
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ISet<SystemMetadata> indexQueue = DistributedMapsFactory.getIndexQueue();
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indexQueue.addItemListener(this, true);
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this.source = indexQueue;
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log.info("System Metadata size: " + indexQueue.size());
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log.info("Object path size:" + objectPathMap.size());
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}
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/**
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* Removes this instance as a system metadata map event listener
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* @throws ServiceFailure
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* @throws FileNotFoundException
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*/
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public void stop() throws FileNotFoundException, ServiceFailure {
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log.info("stopping index entry listener...");
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DistributedMapsFactory.getIndexQueue().removeItemListener(this);
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}
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/**
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* Get the obsoletes chain of the specified id. The returned list doesn't include
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* the specified id itself. The newer version has the lower index number in the list.
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* Empty list will be returned if there is no document to be obsoleted by this id.
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* @param id
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* @return
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* @throws ServiceFailure
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* @throws FileNotFoundException
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*/
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private List<String> getObsoletes(String id) throws FileNotFoundException, ServiceFailure {
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List<String> obsoletes = new ArrayList<String>();
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while (id != null) {
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SystemMetadata metadata = DistributedMapsFactory.getSystemMetadata(id);
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id = null;//set it to be null in order to stop the while loop if the id can't be assinged to a new value in the following code.
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if(metadata != null) {
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Identifier identifier = metadata.getObsoletes();
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if(identifier != null && identifier.getValue() != null && !identifier.getValue().trim().equals("")) {
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obsoletes.add(identifier.getValue());
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id = identifier.getValue();
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}
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}
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}
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return obsoletes;
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}
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public void itemRemoved(ItemEvent<SystemMetadata> entryEvent) {
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// do nothing - indexing acts on added objects, even if they need to be deleted
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}
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public void itemAdded(ItemEvent<SystemMetadata> entryEvent) {
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//System.out.println("===================================calling entryUpdated method ");
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log.info("===================================calling SystemMetadataEventListener.itemAdded method ");
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// add to the index
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Identifier pid = entryEvent.getItem().getIdentifier();
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//System.out.println("===================================update the document "+pid.getValue());
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log.info("===================================adding the document "+pid.getValue());
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SystemMetadata systemMetadata = entryEvent.getItem();
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/*if(systemMetadata == null) {
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writeEventLog(systemMetadata, pid, "SystemMetadataEventListener.itemAdded -could not get the SystemMetadata");
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return;
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}*/
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// make sure we remove this object so that it can be re-added in the future
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if (source != null && systemMetadata != null) {
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source.remove(systemMetadata);
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}
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solrIndex.update(pid, systemMetadata);
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//Identifier obsoletes = systemMetadata.getObsoletes();
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//List<String> obsoletesChain = null;
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/*if (obsoletes != null) {
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try {
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obsoletesChain = getObsoletes(pid.getValue());
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} catch (Exception e) {
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String error = "SystemMetadataEventListener.itemAdded -could not look up revision history " + e.getMessage();
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writeEventLog(systemMetadata, pid, error);
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log.error(error, e);
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return;
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}
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}*/
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/*if(objectPath != null) {
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InputStream data = null;
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try {
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data = new FileInputStream(objectPath);
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solrIndex.update(pid.getValue(), systemMetadata, data);
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EventlogFactory.createIndexEventLog().remove(pid);
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} catch (Exception e) {
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String error = "SystemMetadataEventListener.itemAdded - could not comit the index into the solr server since " + e.getMessage();
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writeEventLog(systemMetadata, pid, error);
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log.error(error, e);
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}
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}*/
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}
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}
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