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/*
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* Harvester.java
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*
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* Created on January 14, 2004, 4:44 PM
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*/
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package edu.ucsb.nceas.metacat.harvesterClient;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.sql.Connection;
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import java.sql.DriverManager;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.sql.SQLWarning;
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import java.sql.Statement;
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import java.util.ArrayList;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.Properties;
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import edu.ucsb.nceas.metacat.client.Metacat;
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import edu.ucsb.nceas.metacat.client.MetacatFactory;
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import edu.ucsb.nceas.metacat.client.MetacatInaccessibleException;
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/**
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* Harvester is the main class for the Harvester application. The main
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* method creates a single Harvester object which drives the application.
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*
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* @author costa
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*
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*/
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public class Harvester {
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/*
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* Class fields
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*/
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/*
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* Class methods
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*/
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/**
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* Constructor. Creates a new instance of Harvester.
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*/
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public Harvester() {
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}
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/**
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* Determines whether Harvester is running on a Win32 platform. Used
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* during development.
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*
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* @return true if this in Win32, false otherwise
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*/
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public static boolean isWin32 () {
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boolean isWin32;
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String osName = System.getProperty("os.name");
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isWin32 = (osName.startsWith("Windows"));
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return isWin32;
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}
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/**
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* Harvester main method.
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*
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* @param args the command line arguments
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* @throws SAXException
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* @throws IOException
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* @throws ParserConfigurationException
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*/
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public static void main(String[] args) {
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Harvester harvester = new Harvester();
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harvester.startup(); // Start up Harvester
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harvester.readHarvestSiteSchedule(); // Read the database table
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harvester.harvest(); // Harvest the documents
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harvester.shutdown(); // Shut down Harvester
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}
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/*
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* Object fields
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*/
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/** Database connection */
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Connection conn;
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/** Used during development to determine whether to connect to metacat */
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private boolean connectToMetacat;
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/** Highest DETAIL_LOG_ID primary key in the HARVEST_DETAIL_LOG table */
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private int detailLogID;
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/** Email address of the Harvester Administrator */
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private String harvesterAdministrator;
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/** Highest HARVEST_LOG_ID primary key in the HARVEST_LOG table */
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private int harvestLogID;
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/** End time of this harvest session */
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private Date harvestEndTime;
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/** List of HarvestLog objects. Stores log entries for report generation. */
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private ArrayList harvestLogList = new ArrayList();
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/** List of HarvestSiteSchedule objects */
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private ArrayList harvestSiteScheduleList = new ArrayList();
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/** Start time of this harvest session */
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private Date harvestStartTime;
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/** Number of days to save log records. Any that are older are purged. */
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int logPeriod;
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/** Metacat client object */
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Metacat metacat;
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/** Loads harvester properties from configuration file */
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Properties properties;
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/*
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* Object methods
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*/
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/*
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Harvester harvester,
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Date harvestDate,
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int status,
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String message,
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String harvestOperationCode,
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int siteScheduleID,
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HarvestDocument harvestDocument,
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String errorMessage
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*/
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/**
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* Creates a new HarvestLog object and adds it to the harvestLogList.
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*
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* @param status the status of the harvest operation
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* @param message the message text of the harvest operation
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* @param harvestOperationCode the harvest operation code
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* @param siteScheduleID the siteScheduleID for which this operation was
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* performed. 0 indicates that the operation did not
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* involve a particular harvest site.
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* @param harvestDocument the associated HarvestDocument object. May be null.
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* @param errorMessage additional error message pertaining to document
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* error.
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*/
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void addLogEntry(int status,
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String message,
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String harvestOperationCode,
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int siteScheduleID,
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HarvestDocument harvestDocument,
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String errorMessage
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) {
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HarvestLog harvestLog;
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/* If there is no associated harvest document, call the basic constructor;
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* else call the extended constructor.
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*/
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if (harvestDocument == null) {
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harvestLog = new HarvestLog(this, harvestStartTime, status, message,
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harvestOperationCode, siteScheduleID);
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}
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else {
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harvestLog = new HarvestLog(this, harvestStartTime, status, message,
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harvestOperationCode, siteScheduleID,
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harvestDocument, errorMessage);
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}
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harvestLogList.add(harvestLog);
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}
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/**
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* Determines whether Harvester should attempt to connect to Metacat.
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* Used during development and testing.
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*
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* @return true if Harvester should connect, otherwise false
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*/
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boolean connectToMetacat () {
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return connectToMetacat;
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}
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/**
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* Normalizes text prior to insertion into the HARVEST_LOG or
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* HARVEST_DETAIL_LOG tables. In particular, replaces the single quote
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* character with the double quote character. This prevents SQL errors
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* involving words that contain single quotes. Also removes \n and \r
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* characters from the text.
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*
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* @param text the original string
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* @return a string containing the normalized text
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*/
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String dequoteText(String text) {
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char c;
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StringBuffer stringBuffer = new StringBuffer();
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for (int i = 0; i < text.length(); i++) {
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c = text.charAt(i);
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switch (c) {
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case '\'':
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stringBuffer.append('\"');
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break;
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case '\r':
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case '\n':
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break;
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default:
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stringBuffer.append(c);
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break;
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}
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}
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return stringBuffer.toString();
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}
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/**
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* Gets the current value of the detailLogID for storage as a primary key in
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* the DETAIL_LOG_ID field of the HARVEST_DETAIL_LOG table.
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*
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* @return the current value of the detailLogID
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*/
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int getDetailLogID() {
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int currentValue = detailLogID;
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detailLogID++;
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return currentValue;
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}
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/**
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* Gets the current value of the harvestLogID for storage as a primary key in
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* the HARVEST_LOG_ID field of the HARVEST_LOG table.
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*
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* @return the current value of the detailLogID
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*/
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int getHarvestLogID() {
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int currentValue = harvestLogID;
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harvestLogID++;
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return currentValue;
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}
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/**
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* Gets the maximum value of an integer field from a table.
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*
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* @param tableName the database table name
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* @param fieldName the field name of the integer field in the table
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* @return the maximum integer stored in the fieldName field of tableName
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*/
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private int getMaxValue(String tableName, String fieldName) {
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int maxValue = 100;
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int fieldValue;
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String query = "SELECT " + fieldName + " FROM " + tableName;
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Statement stmt;
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try {
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stmt = conn.createStatement();
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ResultSet rs = stmt.executeQuery(query);
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while (rs.next()) {
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fieldValue = rs.getInt(fieldName);
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maxValue = Math.max(maxValue, fieldValue);
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}
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stmt.close();
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}
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catch(SQLException ex) {
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System.out.println("SQLException: " + ex.getMessage());
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}
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return maxValue;
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}
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/**
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* Gets the minimum value of an integer field from a table.
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*
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* @param tableName the database table name
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* @param fieldName the field name of the integer field in the table
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* @return the minimum integer stored in the fieldName field of tableName
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*/
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private int getMinValue(String tableName, String fieldName) {
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int minValue = 0;
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int fieldValue;
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String query = "SELECT " + fieldName + " FROM " + tableName;
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Statement stmt;
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try {
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stmt = conn.createStatement();
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ResultSet rs = stmt.executeQuery(query);
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while (rs.next()) {
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fieldValue = rs.getInt(fieldName);
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if (minValue == 0) {
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minValue = fieldValue;
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}
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else {
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minValue = Math.min(minValue, fieldValue);
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}
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}
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stmt.close();
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}
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catch(SQLException ex) {
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System.out.println("SQLException: " + ex.getMessage());
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}
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return minValue;
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}
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/**
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* For every Harvest site schedule in the database, harvest the
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* documents for that site if they are due to be harvested.
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*
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* @throws SAXException
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* @throws IOException
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* @throws ParserConfigurationException
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*/
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private void harvest() {
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HarvestSiteSchedule harvestSiteSchedule;
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for (int i = 0; i < harvestSiteScheduleList.size(); i++) {
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harvestSiteSchedule = (HarvestSiteSchedule)harvestSiteScheduleList.get(i);
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harvestSiteSchedule.harvestDocumentList();
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}
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}
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/**
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* Initializes the detailLogID and harvestLogID values to their current
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* maximums + 1.
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*/
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private void initLogIDs() {
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detailLogID = getMaxValue("HARVEST_DETAIL_LOG", "DETAIL_LOG_ID") + 1;
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harvestLogID = getMaxValue("HARVEST_LOG", "HARVEST_LOG_ID") + 1;
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}
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/**
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* Loads Harvester properties from a configuration file.
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*/
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private void loadProperties() {
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File configfile = new File("../../lib/harvester", "harvester.properties");
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properties = new Properties();
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try {
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properties.load(new FileInputStream(configfile));
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properties.list(System.out);
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}
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catch (IOException e) {
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System.out.println("IOException: " + e.getMessage());
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System.exit(1);
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}
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}
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void printHarvestSiteSchedule(int siteScheduleID) {
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HarvestSiteSchedule harvestSiteSchedule;
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for (int i = 0; i < harvestSiteScheduleList.size(); i++) {
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harvestSiteSchedule = (HarvestSiteSchedule)harvestSiteScheduleList.get(i);
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if (harvestSiteSchedule.siteScheduleID == siteScheduleID) {
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harvestSiteSchedule.printOutput();
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}
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}
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}
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/**
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* Prunes old records from the HARVEST_DETAIL_LOG table. Records are
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* removed if the HARVEST_LOG_ID foreign key is less than the lowest
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* HARVEST_LOG_ID primary key in the HARVEST_LOG table.
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*/
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private void pruneHarvestDetailLog() {
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String deleteString;
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int minHarvestLogID;
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int recordsDeleted;
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Statement stmt;
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minHarvestLogID = getMinValue("HARVEST_LOG", "HARVEST_LOG_ID");
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deleteString = "DELETE FROM HARVEST_DETAIL_LOG WHERE HARVEST_LOG_ID < " +
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minHarvestLogID;
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try {
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System.out.print("Pruning log entries from HARVEST_DETAIL_LOG: ");
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stmt = conn.createStatement();
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recordsDeleted = stmt.executeUpdate(deleteString);
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System.out.println(recordsDeleted + " records deleted");
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stmt.close();
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}
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catch(SQLException e) {
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System.out.println("SQLException: " + e.getMessage());
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}
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}
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/**
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* Prunes old records from the HARVEST_LOG table. Records are removed if
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* their HARVEST_DATE is older than a given number of days, as stored in the
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* logPeriod object field.
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*/
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private void pruneHarvestLog() {
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long currentTime = harvestStartTime.getTime(); // time in milliseconds
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Date dateLastLog; // Prune everything prior to this date
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String deleteString;
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long delta;
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final long millisecondsPerDay = (1000 * 60 * 60 * 24);
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int recordsDeleted;
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SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd-MMM-yyyy");
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String dateString;
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Statement stmt;
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long timeLastLog = 0;
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delta = logPeriod * millisecondsPerDay;
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deleteString = "DELETE FROM HARVEST_LOG WHERE HARVEST_DATE < ";
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timeLastLog = currentTime - delta;
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dateLastLog = new Date(timeLastLog);
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dateString = "'" + simpleDateFormat.format(dateLastLog) + "'";
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deleteString += dateString;
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try {
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System.out.print("Pruning log entries from HARVEST_LOG: ");
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stmt = conn.createStatement();
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recordsDeleted = stmt.executeUpdate(deleteString);
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System.out.println(recordsDeleted + " records deleted");
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stmt.close();
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}
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catch (SQLException e) {
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System.out.println("SQLException: " + e.getMessage());
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}
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}
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/**
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* Reads the HARVEST_SITE_SCHEDULE table in the database, creating
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* a HarvestSiteSchedule object for each row in the table.
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*/
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private void readHarvestSiteSchedule() {
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HarvestSiteSchedule harvestSiteSchedule;
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ResultSet rs;
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SQLWarning warn;
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Statement stmt;
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String contactEmail;
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String dateLastHarvest;
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String dateNextHarvest;
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String documentListURL;
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String ldapDN;
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String ldapPwd;
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int siteScheduleID;
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String unit;
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int updateFrequency;
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try {
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// Read the HARVEST_SITE_SCHEDULE table
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stmt = conn.createStatement();
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rs = stmt.executeQuery("SELECT * FROM HARVEST_SITE_SCHEDULE");
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warn = rs.getWarnings();
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if (warn != null) {
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System.out.println("\n---Warning---\n");
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475
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while (warn != null) {
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System.out.println("Message: " + warn.getMessage());
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System.out.println("SQLState: " + warn.getSQLState());
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System.out.print("Vendor error code: ");
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System.out.println(warn.getErrorCode());
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System.out.println("");
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warn = warn.getNextWarning();
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}
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484
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}
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485
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while (rs.next()) {
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siteScheduleID = rs.getInt("SITE_SCHEDULE_ID");
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documentListURL = rs.getString("DOCUMENTLISTURL");
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489
|
ldapDN = rs.getString("LDAPDN");
|
490
|
ldapPwd = rs.getString("LDAPPWD");
|
491
|
dateNextHarvest = rs.getString("DATENEXTHARVEST");
|
492
|
dateLastHarvest = rs.getString("DATELASTHARVEST");
|
493
|
updateFrequency = rs.getInt("UPDATEFREQUENCY");
|
494
|
unit = rs.getString("UNIT");
|
495
|
contactEmail = rs.getString("CONTACT_EMAIL");
|
496
|
|
497
|
warn = rs.getWarnings();
|
498
|
|
499
|
if (warn != null) {
|
500
|
System.out.println("\n---Warning---\n");
|
501
|
|
502
|
while (warn != null) {
|
503
|
System.out.println("Message: " + warn.getMessage());
|
504
|
System.out.println("SQLState: " + warn.getSQLState());
|
505
|
System.out.print("Vendor error code: ");
|
506
|
System.out.println(warn.getErrorCode());
|
507
|
System.out.println("");
|
508
|
warn = warn.getNextWarning();
|
509
|
}
|
510
|
}
|
511
|
|
512
|
harvestSiteSchedule = new HarvestSiteSchedule(this,
|
513
|
siteScheduleID,
|
514
|
documentListURL,
|
515
|
ldapDN,
|
516
|
ldapPwd,
|
517
|
dateNextHarvest,
|
518
|
dateLastHarvest,
|
519
|
updateFrequency,
|
520
|
unit,
|
521
|
contactEmail
|
522
|
);
|
523
|
harvestSiteScheduleList.add(harvestSiteSchedule);
|
524
|
}
|
525
|
|
526
|
rs.close();
|
527
|
stmt.close();
|
528
|
}
|
529
|
catch (SQLException e) {
|
530
|
System.out.println("Database access failed " + e);
|
531
|
System.exit(1);
|
532
|
}
|
533
|
|
534
|
}
|
535
|
|
536
|
|
537
|
/**
|
538
|
* Sends a report to the Harvester administrator.
|
539
|
*/
|
540
|
void reportToAdministrator() {
|
541
|
System.out.println("\nSending report to administrator.");
|
542
|
}
|
543
|
|
544
|
|
545
|
/**
|
546
|
* Shuts down Harvester. Performs cleanup operations such as logging out
|
547
|
* of Metacat and disconnecting from the database.
|
548
|
*/
|
549
|
private void shutdown() {
|
550
|
// Log shutdown operation
|
551
|
System.out.println("Shutting Down Harvester");
|
552
|
addLogEntry(0, "Shutting Down Harvester", "HarvesterShutdown", 0, null, "");
|
553
|
pruneHarvestLog();
|
554
|
pruneHarvestDetailLog();
|
555
|
|
556
|
try {
|
557
|
// Close the database connection
|
558
|
System.out.println("Closing the database connection");
|
559
|
conn.close();
|
560
|
}
|
561
|
catch (SQLException e) {
|
562
|
System.out.println("Database access failed " + e);
|
563
|
}
|
564
|
|
565
|
writeHarvestLog();
|
566
|
reportToAdministrator();
|
567
|
}
|
568
|
|
569
|
|
570
|
/**
|
571
|
* Initializes Harvester at startup. Connects to the database and to Metacat.
|
572
|
*/
|
573
|
private void startup() {
|
574
|
Boolean ctm;
|
575
|
String dbDriver;
|
576
|
Integer lp;
|
577
|
String metacatURL;
|
578
|
String osName = Harvester.isWin32() ? "Windows" : "Unix";
|
579
|
String password;
|
580
|
//String response;
|
581
|
String sessionId;
|
582
|
String url;
|
583
|
String user;
|
584
|
String userName = System.getProperty("user.name");
|
585
|
SQLWarning warn;
|
586
|
|
587
|
// Log startup operation
|
588
|
System.out.println("*****************************************************");
|
589
|
System.out.println("Starting Up Harvester");
|
590
|
loadProperties();
|
591
|
ctm = Boolean.valueOf(properties.getProperty("connectToMetacat", "true"));
|
592
|
connectToMetacat = ctm.booleanValue();
|
593
|
dbDriver = properties.getProperty("dbDriver");
|
594
|
harvesterAdministrator = properties.getProperty("harvesterAdministrator");
|
595
|
try {
|
596
|
lp = Integer.valueOf(properties.getProperty("logPeriod", "90"));
|
597
|
logPeriod = lp.intValue();
|
598
|
}
|
599
|
catch (NumberFormatException e) {
|
600
|
System.err.println("NumberFormatException: Error parsing logPeriod " +
|
601
|
logPeriod + e.getMessage());
|
602
|
System.err.println("Defaulting to logPeriod of 90 days");
|
603
|
logPeriod = 90;
|
604
|
}
|
605
|
metacatURL = properties.getProperty("metacatURL");
|
606
|
password = properties.getProperty("password");
|
607
|
url = properties.getProperty("url");
|
608
|
user = properties.getProperty("user");
|
609
|
|
610
|
// Load the jdbc driver
|
611
|
try {
|
612
|
Class.forName(dbDriver);
|
613
|
}
|
614
|
catch (ClassNotFoundException e) {
|
615
|
System.out.println("Can't load driver " + e);
|
616
|
System.exit(1);
|
617
|
}
|
618
|
|
619
|
// Make the database connection
|
620
|
try {
|
621
|
System.out.println("Getting connection to Harvester tables");
|
622
|
conn = DriverManager.getConnection(url, user, password);
|
623
|
|
624
|
// If a SQLWarning object is available, print its warning(s).
|
625
|
// There may be multiple warnings chained.
|
626
|
warn = conn.getWarnings();
|
627
|
|
628
|
if (warn != null) {
|
629
|
while (warn != null) {
|
630
|
System.out.println("SQLState: " + warn.getSQLState());
|
631
|
System.out.println("Message: " + warn.getMessage());
|
632
|
System.out.println("Vendor: " + warn.getErrorCode());
|
633
|
System.out.println("");
|
634
|
warn = warn.getNextWarning();
|
635
|
}
|
636
|
}
|
637
|
}
|
638
|
catch (SQLException e) {
|
639
|
System.out.println("Database access failed " + e);
|
640
|
System.exit(1);
|
641
|
}
|
642
|
|
643
|
initLogIDs();
|
644
|
harvestStartTime = new Date();
|
645
|
addLogEntry(0, "Starting Up Harvester", "HarvesterStartup", 0, null, "");
|
646
|
|
647
|
if (connectToMetacat()) {
|
648
|
try {
|
649
|
System.out.println("Connecting to Metacat: " + metacatURL);
|
650
|
metacat = MetacatFactory.createMetacatConnection(metacatURL);
|
651
|
}
|
652
|
catch (MetacatInaccessibleException e) {
|
653
|
System.out.println("Metacat connection failed." + e.getMessage());
|
654
|
}
|
655
|
catch (Exception e) {
|
656
|
System.out.println("Metacat connection failed." + e.getMessage());
|
657
|
}
|
658
|
}
|
659
|
}
|
660
|
|
661
|
|
662
|
/**
|
663
|
* Writes one or more log entries to the HARVEST_LOG table.
|
664
|
*/
|
665
|
private void writeHarvestLog() {
|
666
|
HarvestLog harvestLog;
|
667
|
|
668
|
for (int i = 0; i < harvestLogList.size(); i++) {
|
669
|
harvestLog = (HarvestLog) harvestLogList.get(i);
|
670
|
harvestLog.printOutput();
|
671
|
}
|
672
|
}
|
673
|
|
674
|
}
|