How to use

update

method

in

org.rrd4j.core.Sample

/**
 * Creates sample with the timestamp and data source values supplied
 * in the argument string and stores sample in the corresponding RRD.
 * This method is just a shortcut for:
 * <pre>
 *     set(timeAndValues);
 *     update();
 * </pre>
 *
 * @param timeAndValues String made by concatenating sample timestamp with corresponding
 *                      data source values delmited with colons. For example:<br>
 *                      <code>1005234132:12.2:35.6:U:24.5</code><br>
 *                      <code>NOW:12.2:35.6:U:24.5</code>
 * @throws java.io.IOException Thrown in case of I/O error.
 */
public void setAndUpdate(String timeAndValues) throws IOException {
  set(timeAndValues);
  update();
}

/**
 * <p>Creates sample with the timestamp and data source values supplied
 * in the argument string and stores sample in the corresponding RRD.
 * This method is just a shortcut for:</p>
 * <pre>
 *     set(timeAndValues);
 *     update();
 * </pre>
 *
 * @param timeAndValues String made by concatenating sample timestamp with corresponding
 *                      data source values delmited with colons. For example:<br>
 *                      <code>1005234132:12.2:35.6:U:24.5</code><br>
 *                      <code>NOW:12.2:35.6:U:24.5</code>
 * @throws IOException Thrown in case of I/O error.
 */
public void setAndUpdate(String timeAndValues) throws IOException {
  set(timeAndValues);
  update();
}

  @Override
  public void run() {
    try {
      long time = System.currentTimeMillis() / 1000;
      synchronized (statSample) {
        statSample.setTime(time);
        statSample.setValues(handler.triples);
        statSample.update();
      }
    } catch (Exception e) {
      log.warn("could not update statistics database: {}", e.getMessage());
    }
  }
}

  @Override
  public void run() {
    try {
      long time = System.currentTimeMillis() / 1000;
      synchronized (statSample) {
        statSample.setTime(time);
        statSample.setValues(handler.triples);
        statSample.update();
      }
    } catch (Exception e) {
      log.warn("could not update statistics database: {}", e.getMessage());
    }
  }
}

private void updateSample(long now, double val) throws IOException {
 LOGGER.debug(
   "Sample time is [{}], updating metric [{}] with value [{}]",
   MetricsUtil.getCalendarTime(now),
   mbeanName,
   val);
 sample.setTime(now);
 sample.setValue(rrdDataSourceName, val);
 sample.update();
}

public void commit(JrdsSample sample) {
  RrdDb rrdDb = null;
  try {
    rrdDb = factory.getRrd(getPath());
    Sample onesample = rrdDb.createSample(sample.getTime().getTime() / 1000);
    for(Map.Entry<String, Number> e: sample.entrySet()) {
      onesample.setValue(e.getKey(), e.getValue().doubleValue());
    }
    if(p.getNamedLogger().isDebugEnabled())
      log(Level.DEBUG, "%s", onesample.dump());
    onesample.update();
  } catch (IOException e) {
    log(Level.ERROR, e, "Error while collecting: %s", e.getMessage());
  } finally {
    if(rrdDb != null)
      factory.releaseRrd(rrdDb);
  }
}

protected void flushStatus() {
 if (transactions > 0) {
  try {
   Sample sample = db.createSample(endInterval);
   if (transactionsEnabled) {
    sample.setValue("transactions!", transactions);
   }
   if (minEnabled) {
    sample.setValue("min", min);
   }
   if (maxEnabled) {
    sample.setValue("max", max);
   }
   if (averageEnabled) {
    double value = total / (double) transactions;
    sample.setValue("average", value);
   }
   sample.update();
  } catch (IOException e) {
   throw new EtmException(e);
  }
 }
}

Sample sample = rrdDb.createSample(t);
sample.setValue("a", Math.sin(t / 3000.0) * 50 + 50);
sample.update();

sample.setValue("shade", shadeSource.getValue());
log.println(sample.dump());
sample.update();
t += RANDOM.nextDouble() * MAX_STEP + 1;
if (((++n) % 1000) == 0) {