/** Close events has the cumulative checksum value */
public Event closeEvent() {
Event e = new EventImpl(new byte[0]);
e.set(ATTR_ACK_TYPE, CHECKSUM_STOP);
e.set(ATTR_ACK_HASH, ByteBuffer.allocate(8).putLong(checksum).array());
e.set(ATTR_ACK_TAG, tag);
return e;
}
/**
* Open event starts with a random value that the checksum will be based off of.
*
* <p>Use the host and the nanos as a tag at the collector side.
*/
public Event openEvent() {
Event e = new EventImpl(new byte[0]);
e.set(ATTR_ACK_TYPE, CHECKSUM_START);
checksum = e.getTimestamp();
e.set(ATTR_ACK_HASH, ByteBuffer.allocate(8).putLong(checksum).array());
e.set(ATTR_ACK_TAG, tag);
return e;
}
/** Calculate the crc based on the body of the message and xor it into the checksum. */
public void append(Event e) throws IOException, InterruptedException {
chk.reset();
chk.update(e.getBody());
long curchk = chk.getValue();
checksum ^= curchk; // update but do not send.
e.set(ATTR_ACK_TYPE, CHECKSUM_MSG);
e.set(ATTR_ACK_TAG, tag);
e.set(ATTR_ACK_HASH, ByteBuffer.allocate(8).putLong(curchk).array());
super.append(e);
}
@Before
public void setUp() {
testEvent = new EventImpl();
testEvent.set("one", "one".getBytes());
testEvent.set("two", "two".getBytes());
}