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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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* 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 org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.dataone.configuration.Settings;
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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.v2.SystemMetadata;
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import com.hazelcast.client.ClientConfig;
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import com.hazelcast.client.HazelcastClient;
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import com.hazelcast.config.Config;
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import com.hazelcast.config.FileSystemXmlConfig;
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import com.hazelcast.core.IMap;
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import com.hazelcast.core.ISet;
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import edu.ucsb.nceas.metacat.common.index.IndexTask;
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import edu.ucsb.nceas.metacat.common.index.event.IndexEvent;
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/**
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* A factory to get distributed maps from the haszel cast client.
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* @author tao
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*
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*/
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public class DistributedMapsFactory {
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private static final String IDENTIFIERSETNAME = "hzIdentifiers";
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private static Log log = LogFactory.getLog(DistributedMapsFactory.class);
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private static HazelcastClient hzClient = null;
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private static String hzSystemMetadata = null;
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private static String hzObjectPath = null;
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private static String hzIndexQueue = null;
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private static int waitingTime = IndexGeneratorTimerTask.WAITTIME;
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private static int maxAttempts = IndexGeneratorTimerTask.MAXWAITNUMBER;
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private static IMap<Identifier, SystemMetadata> systemMetadataMap = null;
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private static IMap<Identifier, String> objectPathMap = null;
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private static IMap<Identifier, IndexTask> indexQueue = null;
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/* The name of the identifiers set */
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private static String identifiersSetName = IDENTIFIERSETNAME;
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/* The Hazelcast distributed identifiers set */
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private static ISet<Identifier> identifiersSet = null;
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// for sending index events to metacat
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private static String hzIndexEventMap = null;
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private static IMap<Identifier, IndexEvent> indexEventMap = null;
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/**
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* Start the hazel cast client
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*/
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private static void startHazelCastClient() throws FileNotFoundException, ServiceFailure{
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try {
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waitingTime = Settings.getConfiguration().getInt(IndexGeneratorTimerTask.WAITIMEPOPERTYNAME);
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maxAttempts = Settings.getConfiguration().getInt(IndexGeneratorTimerTask.MAXATTEMPTSPROPERTYNAME);
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} catch (Exception e) {
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log.warn("DistributedMapFactory.startHazelCastClient - 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 = IndexGeneratorTimerTask.WAITTIME;
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maxAttempts = IndexGeneratorTimerTask.MAXWAITNUMBER;
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}
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try {
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identifiersSetName = Settings.getConfiguration().getString("dataone.hazelcast.storageCluster.identifiersSet");
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} catch (Exception e) {
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log.warn("DistributedMapFactory.startHazelCastClient - couldn't read the name of the identifiersSet from the metacat.properties file since : "+e.getMessage()+". Default values will be used");
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identifiersSetName = IDENTIFIERSETNAME;
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}
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// the index queue name to listen to
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hzIndexQueue = Settings.getConfiguration().getString("index.hazelcast.indexqueue");
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// the index event map name to send events to
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hzIndexEventMap = Settings.getConfiguration().getString("index.hazelcast.indexeventmap");
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// get config values
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hzSystemMetadata = Settings.getConfiguration().getString(
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"dataone.hazelcast.storageCluster.systemMetadataMap");
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hzObjectPath = Settings.getConfiguration().getString(
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"dataone.hazelcast.storageCluster.objectPathMap");
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String configFileName = Settings.getConfiguration().getString(
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"dataone.hazelcast.configFilePath");;
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Config hzConfig = null;
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try {
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hzConfig = new FileSystemXmlConfig(configFileName);
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} catch (FileNotFoundException e) {
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log.error("could not load hazelcast configuration file from: " + configFileName, e);
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throw e;
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}
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String hzGroupName = hzConfig.getGroupConfig().getName();
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String hzGroupPassword = hzConfig.getGroupConfig().getPassword();
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String hzAddress = hzConfig.getNetworkConfig().getInterfaces().getInterfaces().iterator().next() + ":" + hzConfig.getNetworkConfig().getPort();
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log.info("starting index entry listener...");
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log.info("System Metadata value: " + hzSystemMetadata);
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log.info("Object path value: " + hzObjectPath);
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log.info("Group Name: " + hzGroupName);
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log.info("Group Password: " + "*****"); // don't show value
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log.info("HZ Address: " + hzAddress);
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// connect to the HZ cluster
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ClientConfig cc = new ClientConfig();
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cc.getGroupConfig().setName(hzGroupName);
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cc.getGroupConfig().setPassword(hzGroupPassword);
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cc.addAddress(hzAddress);
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int times = 0;
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while(true) {
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//System.out.println("here ==================");
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try {
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hzClient = HazelcastClient.newHazelcastClient(cc);
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break;
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} catch (Exception e) {
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if(times <= maxAttempts) {
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log.warn("DistributedMapFactory.startHazelCastClient - the hazelcast service is not ready : "
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+e.getMessage()+"\nWe will try to access it "+waitingTime/1000+" seconds later ");
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try {
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Thread.sleep(waitingTime);
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} catch (Exception ee) {
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log.warn("DistributedMapFactory.startHazelCastClient - the thread can't sleep for "+waitingTime/1000+" seconds to wait the hazelcast service");
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}
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} else {
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throw new ServiceFailure("0000", "DistributedMapFactory.startHazelCastClient - the hazelcast service is not ready even though Metacat-index wailted for "+
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maxAttempts*waitingTime/1000+" seconds. We can't get the system metadata from it and the building index can't happen this time");
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}
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}
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times++;
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//System.out.println("here ==================2");
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}
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}
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/**
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* Get the system metadata map
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* @return
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* @throws FileNotFoundException
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* @throws ServiceFailure
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*/
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public static IMap<Identifier, SystemMetadata> getSystemMetadataMap() throws FileNotFoundException, ServiceFailure {
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if(hzClient == null) {
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startHazelCastClient();
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}
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systemMetadataMap = hzClient.getMap(hzSystemMetadata);
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return systemMetadataMap;
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}
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/**
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* Get the distributed object path map from the haszel cast client.
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* @return
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* @throws FileNotFoundException
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* @throws ServiceFailure
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*/
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public static IMap<Identifier, String> getObjectPathMap() throws FileNotFoundException, ServiceFailure {
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if(hzClient == null) {
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startHazelCastClient();
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}
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objectPathMap = hzClient.getMap(hzObjectPath);
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return objectPathMap;
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}
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/**
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* Get the SystemMetadata for the specified id. The null will be returned if there is no SystemMetadata found for this id
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* @param id the specified id.
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* @return the SystemMetadata for the id
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* @throws FileNotFoundException
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* @throws ServiceFailure
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*/
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public static SystemMetadata getSystemMetadata(String id) throws FileNotFoundException, ServiceFailure {
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if(systemMetadataMap == null) {
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getSystemMetadataMap();
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}
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SystemMetadata metadata = null;
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if(systemMetadataMap != null && id != null) {
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Identifier identifier = new Identifier();
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identifier.setValue(id);
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metadata = systemMetadataMap.get(identifier);
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}
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return metadata;
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}
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/**
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* Get the DataObject for the specified id. The null will be returned if not data object is found.
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* @param id the specified id
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* @return the InputStream of the data object for the specified id.
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* @throws FileNotFoundException
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* @throws ServiceFailure
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*/
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public static InputStream getDataObject(String id) throws FileNotFoundException, ServiceFailure {
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if(objectPathMap == null) {
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getObjectPathMap();
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}
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InputStream data = null;
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if(objectPathMap != null && id != null) {
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Identifier identifier = new Identifier();
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identifier.setValue(id);
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String objectPath = objectPathMap.get(identifier);
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if(objectPath != null) {
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data = new FileInputStream(objectPath);
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}
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}
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return data;
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}
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/**
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* Get the identifiers set in the hazelcast client. The null may be returned if we can't find the set.
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* @return the identifiersSet
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* @throws FileNotFoundException
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* @throws ServiceFailure
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*/
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public static ISet<Identifier> getIdentifiersSet() throws FileNotFoundException, ServiceFailure {
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if(hzClient== null) {
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startHazelCastClient();
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}
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identifiersSet= hzClient.getSet(identifiersSetName);
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return identifiersSet;
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}
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/**
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* Get the indexQueue set from hazelcast client
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* @return the indexQueue
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* @throws FileNotFoundException
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* @throws ServiceFailure
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*/
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public static IMap<Identifier, IndexTask> getIndexQueue() throws FileNotFoundException, ServiceFailure {
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if(hzClient== null) {
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startHazelCastClient();
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}
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indexQueue = hzClient.getMap(hzIndexQueue);
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return indexQueue;
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}
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/**
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* Get the index event map
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* @return the index event map for writing/reading events
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* @throws FileNotFoundException
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* @throws ServiceFailure
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*/
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public static IMap<Identifier, IndexEvent> getIndexEventMap() throws FileNotFoundException, ServiceFailure {
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if(hzClient == null) {
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startHazelCastClient();
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}
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indexEventMap = hzClient.getMap(hzIndexEventMap);
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return indexEventMap;
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}
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}
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