Java tutorial
/** * Heatmap Framework - Core * * Copyright (C) 2013 Martin Becker * becker@informatik.uni-wuerzburg.de * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as * published by the Free Software Foundation, either version 3 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public * License along with this program. If not, see * <http://www.gnu.org/licenses/gpl-3.0.html>. */ package de.uniwue.dmir.heatmap; import java.io.File; import java.io.IOException; import java.text.DateFormat; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import org.apache.commons.io.FileUtils; import org.apache.commons.io.filefilter.DirectoryFileFilter; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.context.support.FileSystemXmlApplicationContext; import de.uniwue.dmir.heatmap.incremental.IProcessLimiter; import de.uniwue.dmir.heatmap.incremental.IProcessManager; import de.uniwue.dmir.heatmap.incremental.IProcessManager.ProcessManagerEntry; public class EntryPointIncremental { public static final Logger LOGGER = LoggerFactory.getLogger(EntryPointIncremental.class); public static final String INCREMENTAL_FILE = "incremental.xml"; public static final String HEATMAP_PROCESSOR__FILE = "heatmap-processor.xml"; public static final String HEATMAP_BEAN = "heatmap"; public static final String WRITER_BEAN = "writer"; public static final String SEED_DIR = "seed"; public static final String CURRENT_DIR = "current"; public static final String BACKUP_DIR = "backup"; public static final String BACKUP_DATE_FORMAT = "yyyy-MM-dd_HH-mm-ss"; public static final String DATE_FORMAT = "yyyy-MM-dd HH:mm:ss"; @SuppressWarnings({ "rawtypes", "unchecked" }) public static void main(String[] args) throws IOException, ParseException { DateFormat df = new SimpleDateFormat(DATE_FORMAT); SimpleDateFormat backupDf = new SimpleDateFormat(BACKUP_DATE_FORMAT); String workDir = System.getProperty("workDir", "."); LOGGER.debug("Work dir: {}", workDir); String configDir = System.getProperty("configDir", "."); LOGGER.debug("Config dir: {}", configDir); File seedDir = new File(workDir, SEED_DIR); LOGGER.debug("Seed dir: {}", seedDir); File currentDir = new File(workDir, CURRENT_DIR); LOGGER.debug("Current dir: {}", currentDir); File backupDir = new File(workDir, BACKUP_DIR); LOGGER.debug("Backup dir: {}", backupDir); String initialMinTimeString = System.getProperty("minTime"); LOGGER.debug("Initial minimal time parameter: {}", initialMinTimeString); Date initialMinTime = initialMinTimeString == null ? new Date(0) : df.parse(initialMinTimeString); LOGGER.debug("Initial minimal time: {}", df.format(initialMinTime)); String absoluteMaxTimeString = System.getProperty("maxTime"); LOGGER.debug("Absolute maximal time parameter: {}", absoluteMaxTimeString); Date absoluteMaxTime = absoluteMaxTimeString == null ? new Date() : new SimpleDateFormat(DATE_FORMAT).parse(absoluteMaxTimeString); LOGGER.debug("Absolute maximal time: {}", df.format(absoluteMaxTime)); String incrementalFile = new File("file:" + configDir, INCREMENTAL_FILE).getPath(); String settingsFile = new File("file:" + configDir, HEATMAP_PROCESSOR__FILE).getPath(); LOGGER.debug("Initializing incremental control file: {}", incrementalFile); FileSystemXmlApplicationContext incrementalContext = new FileSystemXmlApplicationContext(incrementalFile); // get point limit int pointLimit = Integer .parseInt(incrementalContext.getBeanFactory().resolveEmbeddedValue("${point.limit}")); LOGGER.debug("Print limit: {}", pointLimit); // get backups to keep int backupsToKeep = Integer .parseInt(incrementalContext.getBeanFactory().resolveEmbeddedValue("${backups.to.keep}")); LOGGER.debug("Backups to keep: {}", pointLimit); LOGGER.debug("Initializing process components (manager and limiter)."); IProcessManager processManager = incrementalContext.getBean(IProcessManager.class); IProcessLimiter processLimiter = incrementalContext.getBean(IProcessLimiter.class); LOGGER.debug("Starting incremental loop."); while (true) { // break as soon as no new points are available // cleanup --- just in case LOGGER.debug("Deleting \"current\" dir."); FileUtils.deleteDirectory(currentDir); // copy from seed to current LOGGER.debug("Copying seed."); seedDir.mkdirs(); FileUtils.copyDirectory(seedDir, currentDir); // get min time LOGGER.debug("Getting minimal time ..."); Date minTime = initialMinTime; ProcessManagerEntry entry = processManager.getEntry(); if (entry != null && entry.getMaxTime() != null) { minTime = entry.getMaxTime(); } LOGGER.debug("Minimal time: {}", new SimpleDateFormat(DATE_FORMAT).format(minTime)); // break if we processed all available points (minTime is greater than or equal to absoluteMaxTime) if (minTime.getTime() >= absoluteMaxTime.getTime()) { LOGGER.debug("Processed all points."); break; } // get the maximal time LOGGER.debug("Get maximal time."); // get the time from the newest point in our point range (pointMaxTime) ... Date pointMaxTime = processLimiter.getMaxTime(minTime, pointLimit); // ... and possibly break the loop if no new points are available if (pointMaxTime == null) break; // set the max time and make sure we are not taking to many points // (set max time to the minimum of pointMaxTime and absoluteMaxTime) Date maxTime = pointMaxTime.getTime() > absoluteMaxTime.getTime() ? absoluteMaxTime : pointMaxTime; LOGGER.debug("Maximal time: {}", new SimpleDateFormat(DATE_FORMAT).format(maxTime)); // start process processManager.start(minTime); System.setProperty("minTimestamp", new SimpleDateFormat(DATE_FORMAT).format(minTime)); System.setProperty("maxTimestamp", new SimpleDateFormat(DATE_FORMAT).format(maxTime)); FileSystemXmlApplicationContext heatmapContext = new FileSystemXmlApplicationContext(settingsFile); IHeatmap heatmap = heatmapContext.getBean(HEATMAP_BEAN, IHeatmap.class); ITileProcessor tileProcessor = heatmapContext.getBean(WRITER_BEAN, ITileProcessor.class); heatmap.processTiles(tileProcessor); tileProcessor.close(); heatmapContext.close(); // finish process processManager.finish(maxTime); // move old seed if (backupsToKeep > 0) { FileUtils.moveDirectory(seedDir, new File(backupDir, backupDf.format(minTime))); // minTime is the maxTime of the seed // cleanup backups String[] backups = backupDir.list(DirectoryFileFilter.DIRECTORY); File oldestBackup = null; if (backups.length > backupsToKeep) { for (String bs : backups) { File b = new File(backupDir, bs); if (oldestBackup == null || oldestBackup.lastModified() > b.lastModified()) { oldestBackup = b; } } FileUtils.deleteDirectory(oldestBackup); } } else { FileUtils.deleteDirectory(seedDir); } // move new seed FileUtils.moveDirectory(currentDir, seedDir); } incrementalContext.close(); } }