Java Sample.update方法代码示例

import org.jrobin.core.Sample; //导入方法依赖的package包/类
private void addValue(double value) throws IOException {
  try {
    // Open the existing file in r/w mode:
    RrdDb rrdDb = new RrdDb(_rrdPath, false, _rrdBackendFactory);
    try {
      // Create sample with the current timestamp:
      Sample sample = rrdDb.createSample();
      if (sample.getTime() > rrdDb.getLastUpdateTime()) {
        sample.setValue(_name, value);
        sample.update();
      }
    }
    finally {
      rrdDb.close();
    }
  }
  catch (RrdException e) {
    String msg = "Accessing JRobin statistics file '" + _rrdPath + "' failed! If the problem persists, delete the file so it will be recreated.";
    LOG.error(msg, e);
    throw new IOException(msg, e);
  }
}
 

import org.jrobin.core.Sample; //导入方法依赖的package包/类
/**
 * 通过RrdDef创建RRD文件并初始化数据
 */
private void createRRDInitData(long startTime, long endTime,
							   String rootPath, String rrdName, RrdDef rrdDef) {
	try {

		RrdDb rrdDb = new RrdDb(rrdDef);
		// / by this point, rrd file can be found on your disk

		// 模拟一些测试数据
		//Math.sin(2 * Math.PI * (t / 86400.0)) * baseval;
		int baseval = 50;
		for (long t = startTime; t < endTime; t += 300) {
			Sample sample = rrdDb.createSample(t);
			double tmpval = Math.random() * baseval;
			double tmpval2 = Math.random() * baseval;
			sample.setValue("input", tmpval + 50);
			sample.setValue("output", tmpval2 + 50);
			sample.update();
		}
		System.out.println("[RrdDb init data success]");
		System.out.println("[Rrd path]:" + rrdDef.getPath());

		// rrdDb.dumpXml(rootPath + rrdName + "_rrd.xml")
		rrdDb.exportXml(rootPath + rrdName + ".xml");

		// If your RRD files are updated rarely, open them only when
		// necessary and close them as soon as possible.
		rrdDb.close();

		System.out.println("[RrdDb export xml success]");
	} catch (Exception e) {
		e.printStackTrace();

	}
}
 

import org.jrobin.core.Sample; //导入方法依赖的package包/类
public void write(final RrdEntry entry) throws IOException, RrdException {
        final Sample s = m_rrd.createSample(entry.getTimestamp());
        final double[] values = new double[entry.getDsNames().size()];
        int i = 0;
        for (final String dsName : entry.getDsNames()) {
            if (dsName != null) {
                Double value = entry.getValue(dsName);
                final Datasource dataSource = m_rrd.getDatasource(dsName);
                if (value != null) {
                    if (dataSource.getDsType().equals("COUNTER")) {
                        final double counterValue = getLastValue(dsName) + (value * m_step);
                        if (Double.isInfinite(counterValue)) {
                            // if we've overrun the counter, calculate our own counter loop
                            final BigDecimal bigValue = BigDecimal.valueOf(value);
                            final BigDecimal bigLastValue = BigDecimal.valueOf(getLastValue(dsName));
                            final BigDecimal bigStep = BigDecimal.valueOf(m_step);
                            final BigDecimal newValue = bigLastValue.multiply(bigStep).add(bigValue).subtract(m_doubleMax);
                            value = newValue.doubleValue();
                        } else {
                            value = counterValue;
                        }
                    }
                    values[i] = value;
                    setLastValue(dsName, value);
                }
            }
            i++;
        }
        s.setValues(values);
//        LogUtils.debugf(this, "writing sample to %s: %s", outputRrd, s);
        s.update();
    }
 

import org.jrobin.core.Sample; //导入方法依赖的package包/类
Object execute() throws RrdException, IOException {
	String template = getOptionValue("t", "template");
	String[] dsNames = (template != null) ? new ColonSplitter(template).split() : null;
	String[] words = getRemainingWords();
	if (words.length < 3) {
		throw new RrdException("Insufficent number of parameters for rrdupdate command");
	}
	String path = words[1];
	RrdDb rrdDb = getRrdDbReference(path);
	try {
		if (dsNames != null) {
			// template specified, check datasource names
			for (String dsName : dsNames) {
				if (!rrdDb.containsDs(dsName)) {
					throw new RrdException("Invalid datasource name: " + dsName);
				}
			}
		}
		// parse update strings
		long timestamp = -1;
		for (int i = 2; i < words.length; i++) {
			String[] tokens = new ColonSplitter(words[i]).split();
			if (dsNames != null && dsNames.length + 1 != tokens.length) {
				throw new RrdException("Template requires " + dsNames.length + " values, " +
						(tokens.length - 1) + " value(s) found in: " + words[i]);
			}
			int dsCount = rrdDb.getHeader().getDsCount();
			if (dsNames == null && dsCount + 1 != tokens.length) {
				throw new RrdException("Expected " + dsCount + " values, " +
						(tokens.length - 1) + " value(s) found in: " + words[i]);
			}
			timestamp = Util.getTimestamp(tokens[0]);
			Sample sample = rrdDb.createSample(timestamp);
			for (int j = 1; j < tokens.length; j++) {
				if (dsNames == null) {
					sample.setValue(j - 1, parseDouble(tokens[j]));
				}
				else {
					sample.setValue(dsNames[j - 1], parseDouble(tokens[j]));
				}
			}
			sample.update();
		}
		return timestamp;
	}
	finally {
		releaseRrdDbReference(rrdDb);
	}
}