Exemplo n.º 1
1
  /** {@inheritDoc} */
  protected void getNewMonitors(Map<String, Monitor> map) throws MonitorException {
    assert Thread.holdsLock(this);

    int used = prologue.getUsed();
    long modificationTime = prologue.getModificationTimeStamp();

    if ((used > lastUsed) || (lastModificationTime > modificationTime)) {

      lastUsed = used;
      lastModificationTime = modificationTime;

      Monitor monitor = getNextMonitorEntry();
      while (monitor != null) {
        String name = monitor.getName();

        // guard against duplicate entries
        if (!map.containsKey(name)) {
          map.put(name, monitor);

          /*
           * insertedMonitors is null when called from pollFor()
           * via buildMonitorMap(). Since we update insertedMonitors
           * at the end of buildMonitorMap(), it's ok to skip the
           * add here.
           */
          if (insertedMonitors != null) {
            insertedMonitors.add(monitor);
          }
        }
        monitor = getNextMonitorEntry();
      }
    }
  }
Exemplo n.º 2
0
  /** {@inheritDoc} */
  protected MonitorStatus getMonitorStatus(Map<String, Monitor> map) throws MonitorException {
    assert Thread.holdsLock(this);
    assert insertedMonitors != null;

    // load any new monitors
    getNewMonitors(map);

    // current implementation doesn't support deletion or reuse of entries
    ArrayList removed = EMPTY_LIST;
    ArrayList inserted = insertedMonitors;

    insertedMonitors = new ArrayList<Monitor>();
    return new MonitorStatus(inserted, removed);
  }
Exemplo n.º 3
0
  /** {@inheritDoc} */
  protected void buildMonitorMap(Map<String, Monitor> map) throws MonitorException {
    assert Thread.holdsLock(this);

    // start at the beginning of the buffer
    buffer.rewind();

    // create pseudo monitors
    buildPseudoMonitors(map);

    // position buffer to start of the data section
    buffer.position(prologue.getSize());
    nextEntry = buffer.position();
    perfDataItem = 0;

    int used = prologue.getUsed();
    long modificationTime = prologue.getModificationTimeStamp();

    Monitor m = getNextMonitorEntry();
    while (m != null) {
      map.put(m.getName(), m);
      m = getNextMonitorEntry();
    }

    /*
     * set the last modification data. These are set to the values
     * recorded before parsing the data structure. This allows the
     * the data structure to be modified while the Map is being built.
     * The Map may contain more entries than indicated based on the
     * time stamp, but this is handled by ignoring duplicate entries
     * when the Map is updated in getNewMonitors().
     */
    lastUsed = used;
    lastModificationTime = modificationTime;

    // synchronize with the target jvm
    synchWithTarget(map);

    // work around 1.4.2 counter inititization bugs
    kludge(map);

    insertedMonitors = new ArrayList<Monitor>(map.values());
  }