@Override
public void handle(final DatagramChannel datagramChannel, final long deadline)
throws IOException {
try (ByteArrayBuilder bos = new ByteArrayBuilder();
OutputStreamWriter os = new OutputStreamWriter(bos, Charsets.UTF_8)) {
int msgStart = 0, msgEnd = 0, prevEnd = 0;
for (int i = 0; i < measurements.length; i++) {
writeMetric(
measurementInfo,
measurementInfo.getMeasurementName(i),
measurements[i],
timeStampMillis,
os);
os.flush();
msgEnd = bos.size();
int length = msgEnd - msgStart;
if (length > MAX_UDP_MSG_SIZE) {
ByteBuffer byteBuffer = ByteBuffer.wrap(bos.getBuffer(), msgStart, prevEnd - msgStart);
datagramChannel.write(byteBuffer);
msgStart = prevEnd;
}
prevEnd = msgEnd;
}
if (msgEnd > msgStart) {
ByteBuffer byteBuffer = ByteBuffer.wrap(bos.getBuffer(), msgStart, msgEnd - msgStart);
datagramChannel.write(byteBuffer);
}
}
}
/**
* Write with the plaintext protocol:
* https://graphite.readthedocs.io/en/0.9.10/feeding-carbon.html
*
* @param measurementInfo measuremrnt info
* @param measurementName measurement name
* @param measurement measurement value
* @param timeStampMillis timestamp millis since epoch.
* @param os the output writer to write to.
* @throws IOException
*/
public static void writeMetric(
final MeasurementsInfo measurementInfo,
final String measurementName,
final long measurement,
final long timeStampMillis,
final Writer os)
throws IOException {
Strings.writeReplaceWhitespaces(measurementInfo.getMeasuredEntity().toString(), '-', os);
os.append('/');
Strings.writeReplaceWhitespaces(measurementName, '-', os);
os.append(' ');
os.append(Long.toString(measurement));
os.append(' ');
os.append(Long.toString(timeStampMillis));
os.append('\n');
}