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/**
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* '$RCSfile$'
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* Purpose: A class that gets Accession Number, check for uniqueness
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* and register it into db
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* Copyright: 2000 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* Authors: Jivka Bojilova, Matt Jones
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*
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* '$Author: leinfelder $'
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* '$Date: 2011-11-02 20:40:12 -0700 (Wed, 02 Nov 2011) $'
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* '$Revision: 6595 $'
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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.Date;
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import java.util.List;
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import java.util.TimerTask;
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import java.util.Vector;
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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.apache.solr.client.solrj.SolrServerException;
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import org.dataone.client.MNode;
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import org.dataone.configuration.Settings;
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import org.dataone.service.exceptions.InvalidRequest;
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import org.dataone.service.exceptions.InvalidToken;
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import org.dataone.service.exceptions.NotAuthorized;
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import org.dataone.service.exceptions.NotImplemented;
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import org.dataone.service.exceptions.ServiceFailure;
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import org.dataone.service.types.v1.Identifier;
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import org.dataone.service.types.v1.ObjectFormatIdentifier;
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import org.dataone.service.types.v1.ObjectInfo;
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import org.dataone.service.types.v1.ObjectList;
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import org.dataone.service.types.v1.SystemMetadata;
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import com.hazelcast.core.IMap;
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/**
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* A class represents the object to generate massive solr indexes.
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* This can happen during an update of Metacat (generating index for all existing documents)
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* or regenerate index for those documents
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* failing to build index during the insert or update.
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*
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* @author tao
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*
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*/
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public class IndexGenerator extends TimerTask {
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private static final int FIRST =0;
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private static final int SECOND =1;
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public static final int WAITTIME = 10000;
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public static final int MAXWAITNUMBER = 180;
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private static final String HTTP = "http://";
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private static final String MNAPPENDIX = "/d1/mn";
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private static final String RESOURCEMAPPROPERYNAME = "index.resourcemap.namespace";
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public static final String WAITIMEPOPERTYNAME = "index.regenerate.start.waitingtime";
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public static final String MAXATTEMPTSPROPERTYNAME = "index.regenerate.start.maxattempts";
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private static int waitingTime = WAITTIME;
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private static int maxAttempts = MAXWAITNUMBER;
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private SolrIndex solrIndex = null;
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//private SystemMetadataEventListener systemMetadataListener = null;
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private IMap<Identifier, SystemMetadata> systemMetadataMap;
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private IMap<Identifier, String> objectPathMap;
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private Log log = LogFactory.getLog(IndexGenerator.class);
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private MNode mNode = null;
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private static List<String> resourceMapNamespaces = null;
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/**
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* Constructor
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* @param solrIndex
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* @param systemMetadataListener
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*/
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public IndexGenerator(SolrIndex solrIndex) {
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this.solrIndex = solrIndex;
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resourceMapNamespaces = Settings.getConfiguration().getList(RESOURCEMAPPROPERYNAME);
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//this.systemMetadataListener = systemMetadataListener;
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this.mNode = new MNode(buildMNBaseURL());
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try {
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waitingTime = Settings.getConfiguration().getInt(WAITIMEPOPERTYNAME);
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maxAttempts = Settings.getConfiguration().getInt(MAXATTEMPTSPROPERTYNAME);
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} catch (Exception e) {
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log.warn("IndexGenerator.constructor - couldn't read the waiting time or maxattempts from the metacat.properties file since : "+e.getMessage()+". Default values will be used");
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waitingTime = WAITTIME;
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maxAttempts = MAXWAITNUMBER;
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}
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}
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/**
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* Build the index for all documents in Metacat without overwriting.
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* @throws SolrServerException
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* @throws ServiceFailure
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* @throws NotImplemented
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* @throws NotAuthorized
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* @throws InvalidToken
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* @throws InvalidRequest
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*/
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public void indexAll() throws InvalidRequest, InvalidToken, NotAuthorized,
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NotImplemented, ServiceFailure, SolrServerException, FileNotFoundException {
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boolean force = false;
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indexAll(force);
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}
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/**
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* Build the index for all documents. If force is true, the existed index for documents
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* will be overwritten.
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* @param force
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* @throws SolrServerException
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* @throws ServiceFailure
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* @throws NotImplemented
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* @throws NotAuthorized
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* @throws InvalidToken
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* @throws InvalidRequest
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*/
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135 |
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public void indexAll(boolean force) throws InvalidRequest, InvalidToken,
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NotAuthorized, NotImplemented, ServiceFailure, SolrServerException, FileNotFoundException {
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Date since = null;
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Date until = null;
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index(since, until, force);
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}
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/**
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* Build the index for the docs which have been modified since the specified date.
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* @param since
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* @param force
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* @throws SolrServerException
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147 |
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* @throws ServiceFailure
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148 |
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* @throws NotImplemented
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149 |
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* @throws NotAuthorized
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150 |
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* @throws InvalidToken
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151 |
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* @throws InvalidRequest
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152 |
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*/
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153 |
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public void index(Date since, boolean force) throws InvalidRequest, InvalidToken,
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NotAuthorized, NotImplemented, ServiceFailure, SolrServerException, FileNotFoundException {
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Date until = null;
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156 |
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index(since, until, force);
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157 |
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}
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159 |
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/**
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160 |
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* Build the index for the docs which have been modified between the specified date.s
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161 |
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* @param since
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162 |
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* @param until
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163 |
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* @param force
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* @throws SolrServerException
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165 |
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* @throws ServiceFailure
|
166 |
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* @throws NotImplemented
|
167 |
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* @throws NotAuthorized
|
168 |
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* @throws InvalidToken
|
169 |
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* @throws InvalidRequest
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170 |
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* @throws FileNotFoundException
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171 |
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*/
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172 |
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public void index(Date since, Date until, boolean force) throws SolrServerException, InvalidRequest,
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173 |
7691
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InvalidToken, NotAuthorized, NotImplemented, ServiceFailure, FileNotFoundException {
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174 |
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List<String> solrIds = null;
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175 |
7740
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initSystemMetadataMap();
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176 |
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initObjectPathMap();
|
177 |
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List[] allMetacatIds = getMetadataIds(since, until);
|
178 |
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List<String> otherMetacatIds = allMetacatIds[FIRST];
|
179 |
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List<String> resourceMapIds = allMetacatIds[SECOND];
|
180 |
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log.info("the metacat ids (exception resource map -----------------------------"+otherMetacatIds);
|
181 |
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log.info("the metacat resroucemap ids -----------------------------"+resourceMapIds);
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182 |
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if(!force) {
|
183 |
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solrIds = getSolrDocIds();
|
184 |
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}
|
185 |
7607
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tao
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log.info("the solr ids -----------------------------"+solrIds);
|
186 |
7740
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tao
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index(otherMetacatIds, solrIds, force);
|
187 |
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index(resourceMapIds, solrIds, force);
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188 |
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189 |
7734
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tao
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190 |
7740
|
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}
|
191 |
|
|
|
192 |
|
|
/*
|
193 |
|
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* Doing index when it is necessary when compare metacatids and solrids.
|
194 |
|
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*/
|
195 |
|
|
private void index(List<String> metacatIds, List<String>solrIds, boolean force) {
|
196 |
7688
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tao
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if(metacatIds != null) {
|
197 |
7606
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for(String metacatId : metacatIds) {
|
198 |
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if(metacatId != null) {
|
199 |
|
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boolean buildIndex = true;
|
200 |
|
|
if(!force && solrIds != null && solrIds.contains(metacatId)) {
|
201 |
|
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//solr already indexs the id and we don't force it to rebuild it, so set the buildIndex to be false
|
202 |
|
|
buildIndex = false;
|
203 |
|
|
}
|
204 |
|
|
if(buildIndex) {
|
205 |
|
|
try {
|
206 |
|
|
generateIndex(metacatId);
|
207 |
|
|
} catch (Exception e) {
|
208 |
|
|
log.error("IndexGenerator.index - Metacat Index couldn't generate the index for the id - "+metacatId+" because "+e.getMessage());
|
209 |
|
|
}
|
210 |
|
|
|
211 |
|
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}
|
212 |
|
|
}
|
213 |
|
|
}
|
214 |
7688
|
tao
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}
|
215 |
7606
|
tao
|
}
|
216 |
|
|
|
217 |
7613
|
tao
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public void run() {
|
218 |
|
|
try {
|
219 |
|
|
indexAll();
|
220 |
|
|
} catch (InvalidRequest e) {
|
221 |
|
|
// TODO Auto-generated catch block
|
222 |
|
|
//e.printStackTrace();
|
223 |
|
|
log.error("IndexGenerator.run - Metadata-Index couldn't generate indexes for those documents which haven't been indexed : "+e.getMessage());
|
224 |
|
|
} catch (InvalidToken e) {
|
225 |
|
|
// TODO Auto-generated catch block
|
226 |
|
|
//e.printStackTrace();
|
227 |
|
|
log.error("IndexGenerator.run - Metadata-Index couldn't generate indexes for those documents which haven't been indexed : "+e.getMessage());
|
228 |
|
|
} catch (NotAuthorized e) {
|
229 |
|
|
// TODO Auto-generated catch block
|
230 |
|
|
//e.printStackTrace();
|
231 |
|
|
} catch (NotImplemented e) {
|
232 |
|
|
// TODO Auto-generated catch block
|
233 |
|
|
//e.printStackTrace();
|
234 |
|
|
log.error("IndexGenerator.run - Metadata-Index couldn't generate indexes for those documents which haven't been indexed : "+e.getMessage());
|
235 |
|
|
} catch (ServiceFailure e) {
|
236 |
|
|
// TODO Auto-generated catch block
|
237 |
|
|
//e.printStackTrace();
|
238 |
|
|
log.error("IndexGenerator.run - Metadata-Index couldn't generate indexes for those documents which haven't been indexed : "+e.getMessage());
|
239 |
|
|
} catch (SolrServerException e) {
|
240 |
|
|
// TODO Auto-generated catch block
|
241 |
|
|
//e.printStackTrace();
|
242 |
|
|
log.error("IndexGenerator.run - Metadata-Index couldn't generate indexes for those documents which haven't been indexed : "+e.getMessage());
|
243 |
7691
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tao
|
} catch (FileNotFoundException e) {
|
244 |
|
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log.error("IndexGenerator.run - Metadata-Index couldn't generate indexes for those documents which haven't been indexed : "+e.getMessage());
|
245 |
7613
|
tao
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}
|
246 |
|
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}
|
247 |
|
|
|
248 |
7606
|
tao
|
/*
|
249 |
|
|
* Get the indexed ids list from the solr server.
|
250 |
|
|
* An empty list will be returned if there is no ids.
|
251 |
|
|
*/
|
252 |
|
|
private List<String> getSolrDocIds() throws SolrServerException {
|
253 |
|
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List<String> ids = solrIndex.getSolrIds();
|
254 |
|
|
return ids;
|
255 |
|
|
}
|
256 |
|
|
|
257 |
|
|
/*
|
258 |
7740
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tao
|
* Get an array of the list of ids of the metacat. If since and util are null, it will return all of them.
|
259 |
|
|
* The first element of the list is the ids except the resource map. The second elements of the list is the ids of the resource map.
|
260 |
|
|
* The reason to split them is when we index the resource map, we need the index of the document in the resource map ready.
|
261 |
7606
|
tao
|
*/
|
262 |
7740
|
tao
|
private List[] getMetadataIds(Date since, Date until) throws InvalidRequest,
|
263 |
7606
|
tao
|
InvalidToken, NotAuthorized, NotImplemented, ServiceFailure {
|
264 |
7740
|
tao
|
|
265 |
|
|
List<String> resourceMapIds = new ArrayList();
|
266 |
|
|
List<String> otherIds = new ArrayList();
|
267 |
|
|
List[] ids = new List[2];
|
268 |
|
|
ids[FIRST]= otherIds;
|
269 |
|
|
ids[SECOND] = resourceMapIds;
|
270 |
7606
|
tao
|
ObjectList objects = null;
|
271 |
7687
|
tao
|
int times = 0;
|
272 |
|
|
while (true) {
|
273 |
|
|
try {
|
274 |
|
|
mNode.ping();
|
275 |
|
|
break;
|
276 |
|
|
} catch (Exception e) {
|
277 |
7748
|
tao
|
if(times <= maxAttempts) {
|
278 |
7687
|
tao
|
log.warn("IndexGenerator.getMetadataIds - the mnode "+ mNode.getNodeBaseServiceUrl()+
|
279 |
7748
|
tao
|
" is not ready :" +e.getMessage()+"\nWe will try to access it "+waitingTime/1000+" seconds later ");
|
280 |
7687
|
tao
|
try {
|
281 |
7748
|
tao
|
Thread.sleep(waitingTime);
|
282 |
7687
|
tao
|
} catch (Exception ee) {
|
283 |
7748
|
tao
|
log.warn("IndexGenerator.getMetadataIds - the thread can't sleep for "+ waitingTime/1000+" seconds to wait the MNode");
|
284 |
7687
|
tao
|
}
|
285 |
|
|
|
286 |
|
|
} else {
|
287 |
7691
|
tao
|
throw new ServiceFailure("0000", "IndexGenerator.getMetadataIds - the mnode "+ mNode.getNodeBaseServiceUrl()+
|
288 |
7748
|
tao
|
" is not ready even though Metacat-index wailted for "+maxAttempts*waitingTime/1000+" seconds. We can't get the objects list from it and the building index can't happen this time");
|
289 |
7687
|
tao
|
}
|
290 |
|
|
|
291 |
|
|
}
|
292 |
|
|
times++;
|
293 |
|
|
}
|
294 |
7606
|
tao
|
if(since == null && until == null) {
|
295 |
|
|
objects = mNode.listObjects();
|
296 |
|
|
} else {
|
297 |
|
|
objects = mNode.listObjects(since, until, null, true, 0, Integer.MAX_VALUE);
|
298 |
|
|
}
|
299 |
7607
|
tao
|
if(objects != null) {
|
300 |
|
|
List<ObjectInfo> objectInfoList = objects.getObjectInfoList();
|
301 |
|
|
if(objectInfoList != null) {
|
302 |
|
|
for(ObjectInfo info : objectInfoList) {
|
303 |
|
|
if(info != null) {
|
304 |
|
|
Identifier identifier = info.getIdentifier();
|
305 |
|
|
if(identifier != null && identifier.getValue() != null && !identifier.getValue().equals("")) {
|
306 |
7740
|
tao
|
SystemMetadata sysmeta = getSystemMetadata(identifier.getValue());
|
307 |
|
|
if(sysmeta != null && !sysmeta.getArchived()) {
|
308 |
|
|
ObjectFormatIdentifier formatId =sysmeta.getFormatId();
|
309 |
|
|
//System.out.println("the object format id is "+formatId.getValue());
|
310 |
|
|
//System.out.println("the ============ resourcMapNamespaces"+resourceMapNamespaces);
|
311 |
|
|
if(formatId != null && formatId.getValue() != null && resourceMapNamespaces != null && isResourceMap(formatId)) {
|
312 |
|
|
resourceMapIds.add(identifier.getValue());
|
313 |
|
|
} else {
|
314 |
|
|
otherIds.add(identifier.getValue());
|
315 |
|
|
}
|
316 |
|
|
}
|
317 |
|
|
//ids.add(identifier.getValue());
|
318 |
7607
|
tao
|
}
|
319 |
|
|
}
|
320 |
|
|
}
|
321 |
|
|
}
|
322 |
|
|
}
|
323 |
7606
|
tao
|
return ids;
|
324 |
|
|
}
|
325 |
|
|
|
326 |
|
|
/*
|
327 |
7740
|
tao
|
* If the specified ObjectFormatIdentifier is a resrouce map namespace.
|
328 |
|
|
*/
|
329 |
7786
|
tao
|
public static boolean isResourceMap(ObjectFormatIdentifier formatId) {
|
330 |
7740
|
tao
|
boolean isResourceMap = false;
|
331 |
|
|
if(formatId != null && resourceMapNamespaces != null) {
|
332 |
|
|
for(String namespace : resourceMapNamespaces) {
|
333 |
|
|
if(namespace != null && formatId.getValue() != null && !formatId.getValue().trim().equals("") && formatId.getValue().equals(namespace)) {
|
334 |
|
|
isResourceMap = true;
|
335 |
|
|
break;
|
336 |
|
|
}
|
337 |
|
|
}
|
338 |
|
|
}
|
339 |
|
|
return isResourceMap;
|
340 |
|
|
}
|
341 |
|
|
|
342 |
|
|
/*
|
343 |
7606
|
tao
|
* Build up the mn base url
|
344 |
|
|
*/
|
345 |
|
|
private String buildMNBaseURL() {
|
346 |
7691
|
tao
|
String httpPort = Settings.getConfiguration().getString("server.httpPort");
|
347 |
|
|
String serverURL = "http://";
|
348 |
|
|
if(httpPort.equals("443") || httpPort.equals("8443"))
|
349 |
|
|
{
|
350 |
|
|
serverURL = "https://";
|
351 |
|
|
}
|
352 |
|
|
serverURL = serverURL+Settings.getConfiguration().getString("server.name");
|
353 |
|
|
if (!httpPort.equals("80")) {
|
354 |
|
|
serverURL += ":" + httpPort;
|
355 |
|
|
}
|
356 |
|
|
serverURL = serverURL +"/"+ Settings.getConfiguration().getString("application.context")+MNAPPENDIX;
|
357 |
|
|
log.info("IndexGenerator.buildMNBaseURL - the base url of MNode is "+serverURL);
|
358 |
|
|
return serverURL;
|
359 |
7606
|
tao
|
}
|
360 |
|
|
|
361 |
|
|
|
362 |
|
|
/*
|
363 |
|
|
* Generate index for the id.
|
364 |
|
|
*/
|
365 |
|
|
private void generateIndex(String id) throws Exception {
|
366 |
|
|
if(id != null) {
|
367 |
7691
|
tao
|
SystemMetadata sysmeta = getSystemMetadata(id);
|
368 |
|
|
//only update none-archived id.
|
369 |
|
|
if(sysmeta != null && !sysmeta.getArchived()) {
|
370 |
|
|
InputStream data = getDataObject(id);
|
371 |
7606
|
tao
|
Identifier obsolete = sysmeta.getObsoletes();
|
372 |
7627
|
tao
|
List<String> obsoleteChain = null;
|
373 |
7606
|
tao
|
if(obsolete != null) {
|
374 |
7691
|
tao
|
obsoleteChain = getObsoletes(id);
|
375 |
7627
|
tao
|
}
|
376 |
|
|
solrIndex.update(id, obsoleteChain, sysmeta, data);
|
377 |
7606
|
tao
|
} else {
|
378 |
|
|
throw new Exception("IndexGenerator.generate - there is no found SystemMetadata associated with the id "+id);
|
379 |
|
|
}
|
380 |
|
|
|
381 |
|
|
}
|
382 |
|
|
}
|
383 |
7691
|
tao
|
|
384 |
|
|
/*
|
385 |
|
|
* Initialize the system metadata map
|
386 |
|
|
*/
|
387 |
|
|
private void initSystemMetadataMap() throws FileNotFoundException, ServiceFailure{
|
388 |
|
|
int times = 0;
|
389 |
|
|
if(systemMetadataMap == null) {
|
390 |
7774
|
tao
|
systemMetadataMap = DistributedMapsFactory.getSystemMetadataMap();
|
391 |
|
|
/*while(true) {
|
392 |
7691
|
tao
|
try {
|
393 |
|
|
systemMetadataMap = DistributedMapsFactory.getSystemMetadataMap();
|
394 |
|
|
break;
|
395 |
|
|
} catch (FileNotFoundException e) {
|
396 |
|
|
throw e;
|
397 |
|
|
} catch (ServiceFailure e) {
|
398 |
7748
|
tao
|
if(times <= maxAttempts) {
|
399 |
7691
|
tao
|
log.warn("IndexGenerator.initSystemMetadataMap - the hazelcast service is not ready : "
|
400 |
7748
|
tao
|
+e.getMessage()+"\nWe will try to access it "+waitingTime/1000+" seconds later ");
|
401 |
7691
|
tao
|
try {
|
402 |
7748
|
tao
|
Thread.sleep(waitingTime);
|
403 |
7691
|
tao
|
} catch (Exception ee) {
|
404 |
7748
|
tao
|
log.warn("IndexGenerator.initSystemMetadataMap - the thread can't sleep for "+waitingTime/1000+" seconds to wait the hazelcast service");
|
405 |
7691
|
tao
|
}
|
406 |
|
|
|
407 |
|
|
} else {
|
408 |
7748
|
tao
|
throw new ServiceFailure("0000", "IndexGenerator.initSystemMetadataMap - the hazelcast service is not ready even though Metacat-index wailted for "+maxAttempts*waitingTime/1000+" seconds. We can't get the system metadata from it and the building index can't happen this time");
|
409 |
7691
|
tao
|
}
|
410 |
|
|
}
|
411 |
|
|
times++;
|
412 |
7774
|
tao
|
}*/
|
413 |
7691
|
tao
|
}
|
414 |
|
|
}
|
415 |
|
|
|
416 |
|
|
/*
|
417 |
|
|
* We should call this method after calling initSystemMetadataMap since this method doesn't have the mechanism to wait the readiness of the hazelcast service
|
418 |
|
|
*/
|
419 |
|
|
private void initObjectPathMap() throws FileNotFoundException, ServiceFailure {
|
420 |
|
|
if(objectPathMap == null) {
|
421 |
|
|
objectPathMap = DistributedMapsFactory.getObjectPathMap();
|
422 |
|
|
}
|
423 |
|
|
}
|
424 |
|
|
/**
|
425 |
|
|
* Get an InputStream as the data object for the specific pid.
|
426 |
|
|
* @param pid
|
427 |
|
|
* @return
|
428 |
|
|
* @throws FileNotFoundException
|
429 |
|
|
*/
|
430 |
|
|
private InputStream getDataObject(String pid) throws FileNotFoundException {
|
431 |
|
|
Identifier identifier = new Identifier();
|
432 |
|
|
identifier.setValue(pid);
|
433 |
|
|
String objectPath = objectPathMap.get(identifier);
|
434 |
|
|
InputStream data = null;
|
435 |
|
|
data = new FileInputStream(objectPath);
|
436 |
|
|
return data;
|
437 |
|
|
|
438 |
|
|
}
|
439 |
|
|
|
440 |
|
|
/**
|
441 |
|
|
* Get the SystemMetadata for the specified id from the distributed Map.
|
442 |
|
|
* The null maybe is returned if there is no system metadata found.
|
443 |
|
|
* @param id the specified id.
|
444 |
|
|
* @return the SystemMetadata associated with the id.
|
445 |
|
|
*/
|
446 |
|
|
private SystemMetadata getSystemMetadata(String id) {
|
447 |
|
|
SystemMetadata metadata = null;
|
448 |
|
|
if(systemMetadataMap != null && id != null) {
|
449 |
|
|
Identifier identifier = new Identifier();
|
450 |
|
|
identifier.setValue(id);
|
451 |
|
|
metadata = systemMetadataMap.get(identifier);
|
452 |
|
|
}
|
453 |
|
|
return metadata;
|
454 |
|
|
}
|
455 |
|
|
|
456 |
|
|
/**
|
457 |
|
|
* Get the obsoletes chain of the specified id. The returned list doesn't include
|
458 |
|
|
* the specified id itself. The newer version has the lower index number in the list.
|
459 |
|
|
* Empty list will be returned if there is no document to be obsoleted by this id.
|
460 |
|
|
* @param id
|
461 |
|
|
* @return
|
462 |
|
|
*/
|
463 |
|
|
private List<String> getObsoletes(String id) {
|
464 |
|
|
List<String> obsoletes = new ArrayList<String>();
|
465 |
|
|
while (id != null) {
|
466 |
|
|
SystemMetadata metadata = getSystemMetadata(id);
|
467 |
|
|
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.
|
468 |
|
|
if(metadata != null) {
|
469 |
|
|
Identifier identifier = metadata.getObsoletes();
|
470 |
|
|
if(identifier != null && identifier.getValue() != null && !identifier.getValue().trim().equals("")) {
|
471 |
|
|
obsoletes.add(identifier.getValue());
|
472 |
|
|
id = identifier.getValue();
|
473 |
|
|
}
|
474 |
|
|
}
|
475 |
|
|
}
|
476 |
|
|
return obsoletes;
|
477 |
|
|
}
|
478 |
7788
|
tao
|
|
479 |
|
|
/**
|
480 |
|
|
* Overwrite and do nothing
|
481 |
|
|
*/
|
482 |
|
|
public boolean cancel() {
|
483 |
|
|
return true;
|
484 |
|
|
}
|
485 |
7691
|
tao
|
|
486 |
7606
|
tao
|
}
|