wu-sheng

package io.opentracing.contrib;

import io.opentracing.NoopTracerFactory;
import io.opentracing.Tracer;

import java.util.Iterator;
import java.util.ServiceLoader;
import java.util.logging.Level;
import java.util.logging.Logger;

wu-sheng

public final class TraceIdGenerator {
    private static final ThreadLocal<Integer> ThreadTraceIdSequence = new ThreadLocal<Integer>(){
        @Override
        protected Integer initialValue() {
            return 0;
        }
    };

    private static final int PROCESS_UUID;

wu-sheng

/**
 * Code from 
 *  https://github.com/Nike-Inc/wingtips/blob/38d8ce83207ffee3d638bf7466b8f7058bb36498/wingtips-core/src/main/java/com/nike/wingtips/TraceAndSpanIdGenerator.java#L60
 * Thanks to @adriancole
 */

public static long generate64BitRandomLong() {
    byte[] random8Bytes = new byte[8];
    random.nextBytes(random8Bytes);

wu-sheng

• My laptop benchmarks normal random long (including work to create the java object representing a context) is something like 40 per microsecond
• Desktop: 2.8Ghz macbook pro
• Using threadlocalrandom

wu-sheng

/**
 * Created by wusheng on 2016/12/21.
 */
public class Transaction {
    // 当前线程事务GUID
    private java.lang.String traceId;
    // 相关性上级GUID
    private java.lang.String refTraceId;
    // 全局 GUID
    private java.lang.String tripId;

wu-sheng

 /**
   * https://github.com/stagemonitor/stagemonitor/blob/80793ac6c582944c9078b420138dda4d23517a69/stagemonitor-core/src/main/java/org/stagemonitor/core/instrument/AgentAttacher.java#L149-L166
   */
  private static ClassFileTransformer initByteBuddyClassFileTransformer(AutoEvictingCachingBinaryLocator binaryLocator) {
		AgentBuilder agentBuilder = createAgentBuilder(binaryLocator);
		for (StagemonitorByteBuddyTransformer transformer : getStagemonitorByteBuddyTransformers()) {
			agentBuilder = agentBuilder
					.type(transformer.getMatcher())
					.transform(transformer.getTransformer())
					.asDecorator();

wu-sheng

//Type.java
public enum Type { A, B, C, D, E, F, G, H, I, J };


// Base.java
public abstract class Base {
    int i = 1;
    final Type type;
    
    public Base(Type type) {

wu-sheng

// Copyright 2016 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,

wu-sheng

package veddan.physicalcores;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringWriter;
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;

wu-sheng

package net.bytebuddy;

import net.bytebuddy.agent.ByteBuddyAgent;
import net.bytebuddy.agent.builder.AgentBuilder;
import net.bytebuddy.description.type.TypeDescription;
import net.bytebuddy.dynamic.ClassFileLocator;
import net.bytebuddy.dynamic.DynamicType;
import net.bytebuddy.dynamic.loading.ClassInjector;
import net.bytebuddy.implementation.MethodDelegation;
import net.bytebuddy.implementation.bind.annotation.SuperCall;