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
  12 /**
  13  * Background thread started by the {@link Kernel}, which gather statistics and
  14  * monitor/control other processes.
  15  */
  16 class KernelThread extends Thread {
  17         @SuppressWarnings("unused")
  18         private final Kernel kernel;
  19         private final RepositoryStatisticsImpl repoStats;
  20
  21         /** The smallest period of operation, in ms */
  22         private final long PERIOD = 60 * 1000l;
  23         /** One ms in ns */
  24         private final static long m = 1000l * 1000l;
  25         private final static long M = 1024l * 1024l;
  26
  27         private boolean running = true;
  28
  29         private Log kernelStatsLog = LogFactory.getLog("argeo.stats.kernel");
  30         private Log nodeStatsLog = LogFactory.getLog("argeo.stats.node");
  31
  32         @SuppressWarnings("unused")
  33         private long cycle = 0l;
  34
  35         public KernelThread(Kernel kernel) {
  36                 super(kernel.threadGroup, kernel.getClass().getSimpleName());
  37                 this.kernel = kernel;
  38                 this.repoStats = kernel.node.getRepositoryStatistics();
  39         }
  40
  41         private void doSmallestPeriod() {
  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()
  49                                         .getSystemLoadAverage();
  50                         // in min
  51                         boolean min = true;
  52                         long uptime = ManagementFactory.getRuntimeMXBean().getUptime()
  53                                         / (1000 * 60);
  54                         if (uptime > 24 * 60) {
  55                                 min = false;
  56                                 uptime = uptime / 60;
  57                         }
  58                         line.append(uptime).append(min ? " min" : " h").append('\t');
  59                         line.append(loadAvg).append('\t').append(maxMem).append('\t')
  60                                         .append(totalMem).append('\t').append(freeMem).append('\t');
  61                         kernelStatsLog.debug(line);
  62                 }
  63
  64                 if (nodeStatsLog.isDebugEnabled()) {
  65                         File dataDir = KernelUtils.getOsgiInstanceDir();
  66                         long freeSpace = dataDir.getUsableSpace() / M;
  67                         // File currentRoot = null;
  68                         // for (File root : File.listRoots()) {
  69                         // String rootPath = root.getAbsolutePath();
  70                         // if (dataDir.getAbsolutePath().startsWith(rootPath)) {
  71                         // if (currentRoot == null
  72                         // || (rootPath.length() > currentRoot.getPath()
  73                         // .length())) {
  74                         // currentRoot = root;
  75                         // }
  76                         // }
  77                         // }
  78                         // long totalSpace = currentRoot.getTotalSpace();
  79                         StringBuilder line = new StringBuilder(128);
  80                         line.append("§\t").append(freeSpace)
  81                                         .append(" MB left in " + dataDir);
  82                         line.append('\n');
  83                         for (RepositoryStatistics.Type type : RepositoryStatistics.Type
  84                                         .values()) {
  85                                 long[] vals = repoStats.getTimeSeries(type).getValuePerMinute();
  86                                 long val = vals[vals.length - 1];
  87                                 line.append(type.name()).append('\t').append(val).append('\n');
  88                         }
  89                         nodeStatsLog.debug(line);
  90                 }
  91         }
  92
  93         @Override
  94         public void run() {
  95                 final long periodNs = PERIOD * m;
  96                 while (running) {
  97                         long beginNs = System.nanoTime();
  98                         doSmallestPeriod();
  99
 100                         long waitNs = periodNs - (System.nanoTime() - beginNs);
 101                         if (waitNs < 0)
 102                                 continue;
 103                         // wait
 104                         try {
 105                                 sleep(waitNs / m, (int) (waitNs % m));
 106                         } catch (InterruptedException e) {
 107                                 // silent
 108                         }
 109                         cycle++;
 110                 }
 111         }
 112
 113         synchronized void destroyAndJoin() {
 114                 running = false;
 115                 notifyAll();
 116                 interrupt();
 117                 try {
 118                         join(PERIOD * 2);
 119                 } catch (InterruptedException e) {
 120                         throw new CmsException("Kernel thread destruction was interrupted");
 121                 }
 122         }
 123 }