KernelThread.java

   1 package org.argeo.cms.internal.kernel;
   2
   3 import java.io.File;
   4 import java.lang.management.ManagementFactory;
   5
   6 import org.apache.commons.logging.Log;
   7 import org.apache.commons.logging.LogFactory;
   8 import org.apache.jackrabbit.api.stats.RepositoryStatistics;
   9 import org.apache.jackrabbit.stats.RepositoryStatisticsImpl;
  10 import org.argeo.cms.CmsException;
  11 import org.argeo.cms.internal.auth.CmsSessionImpl;
  12
  13 /**
  14  * Background thread started by the {@link Kernel}, which gather statistics and
  15  * monitor/control other processes.
  16  */
  17 class KernelThread extends Thread {
  18         private RepositoryStatisticsImpl repoStats;
  19
  20         /** The smallest period of operation, in ms */
  21         private final long PERIOD = 60 * 1000l;
  22         /** One ms in ns */
  23         private final static long m = 1000l * 1000l;
  24         private final static long M = 1024l * 1024l;
  25
  26         private boolean running = true;
  27
  28         private Log kernelStatsLog = LogFactory.getLog("argeo.stats.kernel");
  29         private Log nodeStatsLog = LogFactory.getLog("argeo.stats.node");
  30
  31         @SuppressWarnings("unused")
  32         private long cycle = 0l;
  33
  34         public KernelThread(ThreadGroup threadGroup, String name) {
  35                 super(threadGroup, name);
  36         }
  37
  38         private void doSmallestPeriod() {
  39                 // Clean expired sessions
  40                 CmsSessionImpl.closeInvalidSessions();
  41
  42                 if (kernelStatsLog.isDebugEnabled()) {
  43                         StringBuilder line = new StringBuilder(64);
  44                         line.append("§\t");
  45                         long freeMem = Runtime.getRuntime().freeMemory() / M;
  46                         long totalMem = Runtime.getRuntime().totalMemory() / M;
  47                         long maxMem = Runtime.getRuntime().maxMemory() / M;
  48                         double loadAvg = ManagementFactory.getOperatingSystemMXBean().getSystemLoadAverage();
  49                         // in min
  50                         boolean min = true;
  51                         long uptime = ManagementFactory.getRuntimeMXBean().getUptime() / (1000 * 60);
  52                         if (uptime > 24 * 60) {
  53                                 min = false;
  54                                 uptime = uptime / 60;
  55                         }
  56                         line.append(uptime).append(min ? " min" : " h").append('\t');
  57                         line.append(loadAvg).append('\t').append(maxMem).append('\t').append(totalMem).append('\t').append(freeMem)
  58                                         .append('\t');
  59                         kernelStatsLog.debug(line);
  60                 }
  61
  62                 if (nodeStatsLog.isDebugEnabled()) {
  63                         File dataDir = KernelUtils.getOsgiInstanceDir();
  64                         long freeSpace = dataDir.getUsableSpace() / M;
  65                         // File currentRoot = null;
  66                         // for (File root : File.listRoots()) {
  67                         // String rootPath = root.getAbsolutePath();
  68                         // if (dataDir.getAbsolutePath().startsWith(rootPath)) {
  69                         // if (currentRoot == null
  70                         // || (rootPath.length() > currentRoot.getPath()
  71                         // .length())) {
  72                         // currentRoot = root;
  73                         // }
  74                         // }
  75                         // }
  76                         // long totalSpace = currentRoot.getTotalSpace();
  77                         StringBuilder line = new StringBuilder(128);
  78                         line.append("§\t").append(freeSpace).append(" MB left in " + dataDir);
  79                         line.append('\n');
  80                         if (repoStats != null)
  81                                 for (RepositoryStatistics.Type type : RepositoryStatistics.Type.values()) {
  82                                         long[] vals = repoStats.getTimeSeries(type).getValuePerMinute();
  83                                         long val = vals[vals.length - 1];
  84                                         line.append(type.name()).append('\t').append(val).append('\n');
  85                                 }
  86                         nodeStatsLog.debug(line);
  87                 }
  88         }
  89
  90         @Override
  91         public void run() {
  92                 final long periodNs = PERIOD * m;
  93                 while (running) {
  94                         long beginNs = System.nanoTime();
  95                         doSmallestPeriod();
  96
  97                         long waitNs = periodNs - (System.nanoTime() - beginNs);
  98                         if (waitNs < 0)
  99                                 continue;
 100                         // wait
 101                         try {
 102                                 sleep(waitNs / m, (int) (waitNs % m));
 103                         } catch (InterruptedException e) {
 104                                 // silent
 105                         }
 106                         cycle++;
 107                 }
 108         }
 109
 110         synchronized void destroyAndJoin() {
 111                 running = false;
 112                 notifyAll();
 113                 interrupt();
 114                 try {
 115                         join(PERIOD * 2);
 116                 } catch (InterruptedException e) {
 117                         throw new CmsException("Kernel thread destruction was interrupted");
 118                 }
 119         }
 120 }