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/**
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* '$RCSfile$'
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* Purpose: Implements a service for managing object formats
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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: $'
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* '$Date: $'
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* '$Revision: $'
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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.service;
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import java.io.ByteArrayInputStream;
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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.sql.SQLException;
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import java.util.HashMap;
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import java.util.List;
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import edu.ucsb.nceas.metacat.DBUtil;
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import edu.ucsb.nceas.metacat.DocumentImpl;
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import edu.ucsb.nceas.metacat.McdbException;
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import edu.ucsb.nceas.metacat.properties.PropertyService;
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import edu.ucsb.nceas.metacat.McdbDocNotFoundException;
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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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import edu.ucsb.nceas.metacat.util.SystemUtil;
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import edu.ucsb.nceas.utilities.PropertyNotFoundException;
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import org.apache.log4j.Logger;
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import org.dataone.client.CNode;
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import org.dataone.client.D1Client;
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import org.dataone.client.ObjectFormatCache;
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import org.dataone.service.exceptions.InsufficientResources;
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import org.dataone.service.exceptions.InvalidRequest;
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import org.dataone.service.exceptions.NotFound;
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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.Identifier;
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import org.dataone.service.types.ObjectFormat;
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import org.dataone.service.types.ObjectFormatList;
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//import org.dataone.service.types.ObjectFormatList;
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import org.dataone.service.types.util.ServiceTypeUtil;
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import org.jibx.runtime.JiBXException;
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/**
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* The ObjectFormatService manages the list of object formats registered
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* within Metacat. This includes schema types, mime types, and other
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* information related to a particular format. The service provides
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* functionality for the DataONE MemberNode and CoordinatingNode components,
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* with CoordinatingNodes providing the authoritative list of object formats.
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*/
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public class ObjectFormatService extends BaseService {
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/* The instance of the logging class */
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private static Logger logMetacat = Logger.getLogger(ObjectFormatService.class);
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/* The singleton instance of the object format service */
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private static ObjectFormatService objectFormatService = null;
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/* The scope of the object formats docid used as the metacat identifier */
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private final String OBJECT_FORMAT_DOCID = "OBJECT_FORMAT_LIST.103";
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/* The revision of the object formats document */
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private int rev;
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/* The separator of the object formats document */
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private String separator = ".";
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/* The accession number of the object formats document */
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private String accNumber = null;
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/* The list of object formats */
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private static ObjectFormatList objectFormatList = null;
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/* the searchable map of object formats */
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private static HashMap<String, ObjectFormat> objectFormatMap =
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new HashMap<String, ObjectFormat>();
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/* A hash map of object format identifiers
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/* The D1 coordinating node reference object used for object format lookups */
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private String coordinatingNodeBaseURL = null;
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/* The D1 coordinating node reference object used for object format lookups */
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private CNode cn = null;
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/* The D1 node type for this instance of metacat */
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private String nodeType;
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/*
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* Constructor: Creates an instance of the object format 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 ObjectFormatService() {
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super();
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_serviceName="ObjectFormatService";
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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 ObjectFormatService. " +
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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 ObjectFormatService 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 objectFormatService - The instance of the object format service
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*/
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public static ObjectFormatService getInstance(){
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if ( objectFormatService == null ) {
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objectFormatService = new ObjectFormatService();
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}
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return objectFormatService;
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}
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/**
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* Refreshes the object format service by manually updating the object
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* format document.
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*/
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public void doRefresh() throws ServiceException {
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logMetacat.debug("ObjectFormatService.doRefresh() called.");
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logMetacat.info("Refreshing the object format list.");
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// create the in-memory list of object formats
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populateObjectFormatList();
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return;
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}
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/**
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* Populate the ObjectFormatService's objectFormatList. If this metacat
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* installation is a D1 Coordinating Node, object formats are populated
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* from a cached document in the Metacat database. Otherwise, if it is
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* a Member Node, it attempts to get the authoritative list from the
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* defined Coordinating Node, failing back to a cached version.
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*
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* @throws ServiceException
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*/
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private void populateObjectFormatList() throws ServiceException {
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try {
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coordinatingNodeBaseURL =
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PropertyService.getProperty("dataone.coordinatingNodeBaseURL");
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nodeType =
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PropertyService.getProperty("dataone.nodeType");
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} catch ( PropertyNotFoundException pnfe ) {
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String message = "There was a problem finding the coordinating node " +
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"URL in the properties file. The message was: " +
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pnfe.getMessage();
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logMetacat.error(message);
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throw new ServiceException(message);
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}
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this.getCachedList();
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}
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/**
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* Indicate whether or not this service is refreshable. In this case it is,
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* where the ObjectFormatService can manually get the latest object format
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* document from Metacat.
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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 true;
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}
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/**
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* Stop the ObjectFormatService. When stopped, the service will no longer
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* respond to requests. Not implemented yet.
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*/
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public void stop() throws ServiceException {
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// stub only
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return;
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}
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/**
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* List the object formats registered with the object format service.
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*
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* @return objectFormatList - the list of object formats
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*/
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public ObjectFormatList listFormats() {
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return ObjectFormatService.objectFormatList;
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}
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/**
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* Get the object format based on the given identifier as a string.
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*
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* @param format - the object format as a string
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* @return objectFormat - the ObjectFormat represented by the format string
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*/
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public static ObjectFormat getFormat(String format) {
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ObjectFormat objectFormat = null;
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objectFormat = ObjectFormatService.objectFormatMap.get(format);
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return objectFormat;
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}
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/**
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* Get the object format list cached in Metacat, or on failure, via a
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* cached file on disk
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*
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* @return objectFormatList - the cached object format list
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*/
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private void getCachedList()
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throws ServiceException {
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try {
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// reset the accession number separator in case it is
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// different than the default
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try {
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this.separator = PropertyService.getProperty("document.accNumSeparator");
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} catch ( PropertyNotFoundException pnfe ) {
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// use the default separator, but log the issue
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logMetacat.debug("There was a problem finding the document " +
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"separator property. The error message was: " + pnfe.getMessage());
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}
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// get the latest accession number if it is in Metacat
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this.rev =
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DBUtil.getLatestRevisionInDocumentTable(this.OBJECT_FORMAT_DOCID);
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if ( this.rev != -1 ) {
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this.accNumber = this.OBJECT_FORMAT_DOCID +
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this.separator +
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this.rev;
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DocumentImpl objectFormatsDocument = new DocumentImpl(accNumber, false);
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ByteArrayInputStream bais =
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new ByteArrayInputStream(objectFormatsDocument.toString().getBytes());
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ObjectFormatService.objectFormatList =
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this.deserializeObjectFormatList(bais);
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} else {
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logMetacat.info("The latest revision number of " +
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this.OBJECT_FORMAT_DOCID +
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" could not be found. Reverting to the on-disk " +
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"object format list");
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ObjectFormatService.objectFormatList = ObjectFormatCache.listFormats();
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}
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} catch ( SQLException sqle ) {
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// we either have a metacat error or the docid was not inserted yet
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logMetacat.info("The latest revision number of " +
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this.OBJECT_FORMAT_DOCID +
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" could not be found. Reverting to the on-disk " +
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"object format list");
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ObjectFormatService.objectFormatList = ObjectFormatCache.listFormats();
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} catch (McdbException mcdbe) {
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// we have a metacat doc not found error
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logMetacat.info( this.OBJECT_FORMAT_DOCID +
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" could not be found. Reverting to the on-disk " +
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"object format list");
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ObjectFormatService.objectFormatList = ObjectFormatCache.listFormats();
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}
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return;
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}
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/**
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* Deserialize the object format list file to an object format list object
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*
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* @param fileInputStream - the file input stream of the XML object format list file
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* @return objectFormatList - the ObjectFormatList object from the XML stream
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* @throws ServiceException
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*/
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private ObjectFormatList deserializeObjectFormatList(InputStream inputStream)
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throws ServiceException {
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ObjectFormatList objectFormatList;
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try {
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objectFormatList = (ObjectFormatList)
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ServiceTypeUtil.deserializeServiceType(ObjectFormatList.class, inputStream);
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} catch ( JiBXException jbxe ) {
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logMetacat.debug("There was an error deserializing the input stream. " +
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"The error was: " + jbxe.getMessage());
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jbxe.printStackTrace();
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throw new ServiceException(jbxe.getMessage());
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}
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return objectFormatList;
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}
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}
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