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/**
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* '$RCSfile$'
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* Purpose: Implements a service for managing a Hazelcast cluster member
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* Copyright: 2011 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* Authors: Christopher Jones
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*
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* '$Author: leinfelder $'
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* '$Date: 2011-09-08 14:23:40 -0700 (Thu, 08 Sep 2011) $'
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* '$Revision: 6399 $'
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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.dataone.hazelcast;
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import org.apache.log4j.Logger;
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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.Hazelcast;
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import com.hazelcast.core.IMap;
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import com.hazelcast.core.InstanceEvent;
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import com.hazelcast.core.InstanceListener;
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import edu.ucsb.nceas.metacat.shared.BaseService;
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import edu.ucsb.nceas.metacat.shared.ServiceException;
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/**
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* The Hazelcast service enables Metacat as a Hazelcast cluster member
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*/
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public class HazelcastService extends BaseService
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implements InstanceListener {
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/* The instance of the logging class */
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private static Logger logMetacat = Logger.getLogger(HazelcastService.class);
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/* The singleton instance of the hazelcast service */
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private static HazelcastService hazelcastService = null;
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/*The distributed DataONE system metadata map*/
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private IMap<Identifier, SystemMetadata> systemMetadata;
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/* the name of the system metadata map in hazelcast */
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private String systemMetadataMap = "hzSystemMetadata";
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/*
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* Constructor: Creates an instance of the hazelcast service. Since
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* this uses a singleton pattern, use getInstance() to gain the instance.
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*/
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private HazelcastService() {
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super();
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_serviceName="HazelcastService";
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try {
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doRefresh();
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} catch (ServiceException se) {
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logMetacat.debug("There was a problem creating the HazelcastService. " +
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"The error message was: " + se.getMessage());
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}
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}
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/**
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* Get the instance of the HazelcastService that has been instantiated,
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* or instantiate one if it has not been already.
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*
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* @return hazelcastService - The instance of the hazelcast service
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*/
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public static HazelcastService getInstance(){
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if ( hazelcastService == null ) {
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hazelcastService = new HazelcastService();
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}
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return hazelcastService;
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}
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/**
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* Refreshes the Hazelcast service
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*/
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public void doRefresh() throws ServiceException {
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logMetacat.debug("HazelcastService.doRefresh() called.");
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this.systemMetadata = Hazelcast.getMap(this.systemMetadataMap);
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return;
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}
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/**
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* Indicate whether or not this service is refreshable.
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*
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* @return refreshable - the boolean refreshable status
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*/
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public boolean refreshable() {
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return false; //right?
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}
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/**
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* Stop the HazelcastService. When stopped, the service will no longer
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* respond to requests.
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*/
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public void stop() throws ServiceException {
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Hazelcast.getLifecycleService().shutdown();
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}
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/**
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* Listen for new Hazelcast member events
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*/
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@Override
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public void instanceCreated(InstanceEvent event) {
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logMetacat.info("New Hazelcast instance created: " +
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event.getInstance().getId() + ", " +
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event.getInstance().getInstanceType());
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}
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@Override
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public void instanceDestroyed(InstanceEvent event) {
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logMetacat.info("Hazelcast instance removed: " +
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event.getInstance().getId() + ", " +
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event.getInstance().getInstanceType());
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}
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}
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