traceId的生成

public String getTransactionId() {return TransactionIdUtils.formatString(agentId, agentStartTime, transactionSequence);}public static final String TRANSACTION_ID_DELIMITER = "^";public static String formatString(String agentId, long agentStartTime, long transactionSequence) {if (agentId == null) {throw new NullPointerException("agentId must not be null");}StringBuilder sb = new StringBuilder(64);sb.append(agentId);sb.append(TRANSACTION_ID_DELIMITER);sb.append(agentStartTime);sb.append(TRANSACTION_ID_DELIMITER);sb.append(transactionSequence);return sb.toString();}

spanId的生成

public class SpanId {public static final long NULL = -1;//    private static final Random seed = new Random();public static long newSpanId() {final Random random = getRandom();return createSpanId(random);}// Changed to ThreadLocalRandom because unique value per thread will be enough.// If you need to change Random implementation, modify this method.private static Random getRandom() {return ThreadLocalRandomUtils.current();}private static long createSpanId(Random seed) {long id = seed.nextLong();while (id == NULL) {id = seed.nextLong();}return id;}public static long nextSpanID(long spanId, long parentSpanId) {final Random seed = getRandom();long newId = createSpanId(seed);while (newId == spanId || newId == parentSpanId) {newId = createSpanId(seed);}return newId;}
}

docs

• TransactionIdUtils

• SpanId.java