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/**
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* '$RCSfile$'
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* Purpose: A Class that tracks sessions for MetaCatServlet users.
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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: Matt Jones
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* Release: @release@
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*
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* '$Author: sgarg $'
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* '$Date: 2005-11-11 10:00:54 -0800 (Fri, 11 Nov 2005) $'
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* '$Revision: 2733 $'
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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;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.util.Vector;
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import java.util.HashMap;
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import java.lang.Comparable;
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import edu.ucsb.nceas.metacat.MetaCatUtil;
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import org.apache.log4j.Logger;
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public class IndexingQueue {
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private Logger logMetacat = Logger.getLogger(IndexingQueue.class);
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// Map used to keep tracks of docids to be indexed
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private HashMap indexingMap = new HashMap();
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private Vector currentThreads = new Vector();
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public Vector currentDocidsBeingIndexed = new Vector();
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private static IndexingQueue instance = null;
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final static int NUMBEROFINDEXINGTHREADS =
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Integer.parseInt(MetaCatUtil.getOption("numberOfIndexingThreads"));
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private int sleepTime = 2000;
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public IndexingQueue() {
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for (int i = 0; i < NUMBEROFINDEXINGTHREADS; i++) {
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Thread thread = new IndexingTask();
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thread.start();
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}
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}
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public static synchronized IndexingQueue getInstance(){
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if (instance == null) {
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instance = new IndexingQueue();
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}
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return instance;
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}//getInstance
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public void add(String docid, String rev) {
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add(new IndexingQueueObject(docid, rev, 0));
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}
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protected void add(IndexingQueueObject queueObject) {
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synchronized (indexingMap) {
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if(!indexingMap.containsKey(queueObject.getDocid())){
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indexingMap.put(queueObject.getDocid(), queueObject);
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indexingMap.notify();
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} else {
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IndexingQueueObject oldQueueObject =
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(IndexingQueueObject) indexingMap.get(queueObject.getDocid());
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if(oldQueueObject.compareTo(queueObject) < 0){
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indexingMap.put(queueObject.getDocid(), queueObject);
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indexingMap.notify();
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}
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}
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}
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}
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protected IndexingQueueObject getNext() {
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IndexingQueueObject returnVal = null;
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synchronized (indexingMap) {
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while (indexingMap.isEmpty()) {
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try {
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indexingMap.wait();
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} catch (InterruptedException ex) {
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System.err.println("Interrupted");
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}
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}
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String docid = (String) indexingMap.keySet().iterator().next();
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returnVal = (IndexingQueueObject)indexingMap.get(docid);
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indexingMap.remove(docid);
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}
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return returnVal;
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}
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}
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class IndexingTask extends Thread {
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private Logger logMetacat = Logger.getLogger(IndexingTask.class);
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protected final long MAXIMUMINDEXDELAY = Integer.
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parseInt(MetaCatUtil.getOption("maximumIndexDelay"));;
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public void run() {
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while (true) {
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// blocks until job
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IndexingQueueObject returnVal =
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IndexingQueue.getInstance().getNext();
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if(!IndexingQueue.getInstance().
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currentDocidsBeingIndexed.contains(returnVal.getDocid())){
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try {
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IndexingQueue.getInstance().
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currentDocidsBeingIndexed.add(returnVal.getDocid());
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String docid = returnVal.getDocid() + "." + returnVal.getRev();
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checkDocumentTable(docid, "xml_documents");
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DocumentImpl doc = new DocumentImpl(docid, false);
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logMetacat.warn("Calling buildIndex for " + docid);
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doc.buildIndex();
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} catch (Exception e) {
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logMetacat.warn("Exception: " + e);
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e.printStackTrace();
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if(returnVal.getCount() < 25){
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returnVal.setCount(returnVal.getCount()+1);
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// add the docid back to the list
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IndexingQueue.getInstance().add(returnVal);
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} else {
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logMetacat.fatal("Docid " + returnVal.getDocid()
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+ " has been inserted to IndexingQueue "
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+ "more than 25 times. Not adding the docid to"
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+ " the queue again.");
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}
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} finally {
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IndexingQueue.getInstance().currentDocidsBeingIndexed
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.remove(returnVal.getDocid());
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}
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} else {
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returnVal.setCount(returnVal.getCount()+1);
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IndexingQueue.getInstance().add(returnVal);
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}
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}
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}
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private void checkDocumentTable(String docid, String tablename) throws Exception{
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DBConnection dbConn = null;
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int serialNumber = -1;
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String revision = docid.substring(docid.lastIndexOf(".")+1,docid.length());
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docid = docid.substring(0,docid.lastIndexOf("."));
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logMetacat.warn("docid is " + docid
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+ " and revision is " + revision);
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try {
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// Opening separate db connection for writing XML Index
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dbConn = DBConnectionPool
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.getDBConnection("DBSAXHandler.checkDocumentTable");
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serialNumber = dbConn.getCheckOutSerialNumber();
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// the following while loop construct checks to make sure that
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// the docid of the document that we are trying to index is already
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// in the xml_documents table. if this is not the case, the foreign
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// key relationship between xml_documents and xml_index is
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// temporarily broken causing multiple problems.
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boolean inxmldoc = false;
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long startTime = System.currentTimeMillis();
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while (!inxmldoc) {
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String xmlDocumentsCheck = "select distinct docid from " + tablename
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+ " where docid ='"
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+ docid
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+ "' and "
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+ " rev ='"
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+ revision + "'";
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PreparedStatement xmlDocCheck = dbConn
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.prepareStatement(xmlDocumentsCheck);
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// Increase usage count
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dbConn.increaseUsageCount(1);
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xmlDocCheck.execute();
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ResultSet doccheckRS = xmlDocCheck.getResultSet();
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boolean tableHasRows = doccheckRS.next();
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if (tableHasRows) {
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inxmldoc = true;
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}
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doccheckRS.close();
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xmlDocCheck.close();
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// make sure the while loop will be ended in reseaonable time
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long stopTime = System.currentTimeMillis();
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if ((stopTime - startTime) > MAXIMUMINDEXDELAY) {
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logMetacat.warn("Couldn't find the docid:" + docid
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+ " for indexing in "
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+ "reseaonable time!");
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throw new Exception(
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"Couldn't find the docid for index build in "
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+ "reseaonable time!");
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}
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}//while
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} catch (SQLException e) {
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e.printStackTrace();
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} finally {
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DBConnectionPool.returnDBConnection(dbConn, serialNumber);
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}//finally
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}
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}
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class IndexingQueueObject implements Comparable{
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// the docid of the document to be indexed.
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private String docid;
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// the docid of the document to be indexed.
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private String rev;
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// the count of number of times the document has been in the queue
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private int count;
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IndexingQueueObject(String docid, String rev, int count){
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this.docid = docid;
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this.rev = rev;
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this.count = count;
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}
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public int getCount(){
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return count;
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}
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public String getDocid(){
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return docid;
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}
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public String getRev(){
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return rev;
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}
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public void setCount(int count){
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this.count = count;
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}
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public void setDocid(String docid){
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this.docid = docid;
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}
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public void setRev(String rev){
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this.rev = rev;
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}
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public int compareTo(Object o){
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if(o instanceof IndexingQueueObject){
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int revision = Integer.parseInt(rev);
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int oRevision = Integer.parseInt(((IndexingQueueObject)o).getRev());
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if(revision == oRevision) {
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return 0;
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} else if (revision > oRevision) {
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return 1;
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} else {
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return -1;
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}
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} else {
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throw new java.lang.ClassCastException();
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}
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}
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}
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