Java tutorial
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(By way * of non-limiting example, you will not contribute any code obtained by you under the GNU General Public License or other * so-called "reciprocal" license.) *******************************************************************************/ package edu.stanford.epad.epadws.processing.pipeline.watcher; import java.io.File; import java.util.Calendar; import java.util.concurrent.TimeUnit; import org.apache.commons.io.FileSystemUtils; import edu.stanford.epad.common.util.EPADConfig; import edu.stanford.epad.common.util.EPADLogger; import edu.stanford.epad.epadws.EPadWebServerVersion; import edu.stanford.epad.epadws.epaddb.EpadDatabase; import edu.stanford.epad.epadws.epaddb.EpadDatabaseOperations; import edu.stanford.epad.epadws.processing.pipeline.task.CleanupTempTask; import edu.stanford.epad.epadws.processing.pipeline.task.EpadStatisticsTask; import edu.stanford.epad.epadws.processing.pipeline.threads.ShutdownSignal; import edu.stanford.epad.epadws.security.EPADSessionOperations; import edu.stanford.epad.epadws.service.DefaultEpadProjectOperations; import edu.stanford.epad.epadws.service.EpadProjectOperations; import edu.stanford.epad.epadws.service.RemotePACService; import edu.stanford.epad.epadws.service.UserProjectService; /** * Times out EPAD sessions * * @author dev * */ public class EPADSessionWatcher implements Runnable { private static final EPADLogger log = EPADLogger.getInstance(); public static final int CHECK_INTERVAL = 1000 * 60; // Check every minute. private final ShutdownSignal shutdownSignal = ShutdownSignal.getInstance(); public static boolean diskspacealert = false; public static final int MIN_DISKSPACE = 500; private String jsessionID = null; public EPADSessionWatcher() { log.info("Starting the EPAD Session Timer"); } @Override public void run() { EpadProjectOperations projectOperations = DefaultEpadProjectOperations.getInstance(); EpadDatabaseOperations epadDatabaseOperations = EpadDatabase.getInstance().getEPADDatabaseOperations(); Calendar prevTime = null; long count = 0; while (!shutdownSignal.hasShutdown()) { try { long freeHeap = Runtime.getRuntime().freeMemory(); long totalHeap = Runtime.getRuntime().totalMemory(); count++; if (freeHeap < totalHeap / 8 && count % 5 == 0) log.info("Total Heap = " + totalHeap + ", Free Heap = " + freeHeap); // Timeout expired sessions EPADSessionOperations.checkSessionTimeout(); Calendar now = Calendar.getInstance(); // every 15 minutes if (now.get(Calendar.MINUTE) % 15 == 0) { diskspacealert = false; try { long dcm4cheeMb = FileSystemUtils.freeSpaceKb(EPADConfig.dcm4cheeDirRoot) / 1024; long epadMb = FileSystemUtils.freeSpaceKb(EPADConfig.getEPADWebServerBaseDir()) / 1024; long tmpMb = FileSystemUtils.freeSpaceKb(System.getProperty("java.io.tmpdir")) / 1024; long mysqlMb = MIN_DISKSPACE; if (new File("/var/lib/mysql").exists()) mysqlMb = FileSystemUtils.freeSpaceKb("/var/lib/mysql") / 1024; if (dcm4cheeMb < MIN_DISKSPACE || epadMb < MIN_DISKSPACE || tmpMb < MIN_DISKSPACE || mysqlMb < MIN_DISKSPACE) { diskspacealert = true; projectOperations.createEventLog("system", null, null, null, null, null, null, null, "Disk Space", "Server running out of disk space", true); epadDatabaseOperations.insertEpadEvent("admin", "Server running out of disk space", "", "", "", "", "", "", "Server running out of disk space"); } if (EPadWebServerVersion.restartRequired) { epadDatabaseOperations.insertEpadEvent("admin", "Software updated, Please restart ePAD", "", "", "", "", "", "", "Please restart ePAD"); } } catch (Exception x) { log.warning("Exception checking disk space", x); } } // Once a day if (prevTime == null || (now.get(Calendar.HOUR_OF_DAY) == 0 && prevTime != null && prevTime.get(Calendar.HOUR_OF_DAY) != 0)) { if (projectOperations.getCacheSize() > 1000 && UserProjectService.pendingPNGs.isEmpty() && RemotePACService.pendingTransfers.isEmpty()) projectOperations.clearCache(); epadDatabaseOperations.deleteOldEvents(); try { if (!"true".equalsIgnoreCase(EPADConfig.getParamValue("DISABLE_STATISTICS"))) { EpadStatisticsTask est = new EpadStatisticsTask(); new Thread(est).start(); } } catch (Exception x) { log.warning("Exception running statistics", x); } try { CleanupTempTask ctt = new CleanupTempTask(); new Thread(ctt).start(); } catch (Exception x) { log.warning("Exception running cleanup", x); } } prevTime = now; TimeUnit.MILLISECONDS.sleep(CHECK_INTERVAL); } catch (Exception e) { log.severe("Exception in EPAD Session Timer thread", e); } } log.info("Warning: EPADSessionWatcher shutting down."); } }