随记

......

发表于

DOCKER

查看指定服务名的日志（只有一个服务实列）
docker service ps t_mserv_espare|grep Running|awk '{print $1}'|xargs docker service logs -f

构建镜像

docker build -t <TAG_NAME> <Dockerfile_PATH>

运行镜像

docker run -d -p 3000:3000/tcp -v /d:\\test:/home/test gettingg-started

-d(etach) 后台模式运行 -p(ublish) <hostPort>:<containerPort>/<protocol[tpc,udp...]> 端口映射

-v(olume) 磁盘映射 hostPath:containerPath

查看镜像列表

docker images

查看容器实例列表

docker ps 或者 docker container ls

查看实例中运行的程序的STD_OUT(标准输出)(eg:c语言中的print/printf,node:console.log,java:System.out…)

docker logs <containerId>

运行当前运行中容器中的命令

docker exec [OPTIONS] CONTAINER COMMAND [ARG...]

Options:
  -d, --detach               Detached mode: run command in the background
      --detach-keys string   Override the key sequence for detaching a
                             container
  -e, --env list             Set environment variables
  -i, --interactive          Keep STDIN open even if not attached
      --privileged           Give extended privileges to the command
  -t, --tty                  Allocate a pseudo-TTY
  -u, --user string          Username or UID (format:
                             <name|uid>[:<group|gid>])
  -w, --workdir string       Working directory inside the container

eg: docker exec -it 12e /bin/sh

执行上述命令后会会自动连接到目标容易的终端

删除容器

`docker rm -f

创建服务

docker service create [OPTIONS] IMAGE [COMMAND] [ARG...]

强制重启服务

docker service update your_service_name --force

查看service的containerId

for f in $(docker service ps -q t_mserv_base_mq);do docker inspect --format '{{.ServiceID}} {{.NodeID}} {{.Status.ContainerStatus.ContainerID}} {{.DesiredState}}' $f; done

docker 容器可视化

docker pull dockersamples/visualizer:latest
docker service create \
--name=viz \
--publish=12306:8080/tcp \
--constraint=node.role==manager \
--mount=type=bind,src=/var/run/docker.sock,dst=/var/run/docker.sock \
dockersamples/visualizer:latest

DockerFile

COPY SRC DEST

复制src文件到dest

ADD SRC DEST

复制src文件到dest,如果src为压缩文件，怎复制和自动解压

CMD cmd args…

在docker run 时运行

RUN cmd args…

在docker build时运行，可能

HEX(NUM) -> DECIMAL
int r= (int)(NUM / 10)*16 + NUM%10

日志

docker service logs --help

Usage:  docker service logs [OPTIONS] SERVICE|TASK

Fetch the logs of a service or task

Options:
      --details        Show extra details provided to logs
  -f, --follow         Follow log output
      --no-resolve     Do not map IDs to Names in output
      --no-task-ids    Do not include task IDs in output
      --no-trunc       Do not truncate output
      --raw            Do not neatly format logs
      --since string   Show logs since timestamp (e.g. 2013-01-02T13:23:37Z) or relative (e.g. 42m for 42 minutes)
  -n, --tail string    Number of lines to show from the end of the logs (default "all")
  -t, --timestamps     Show timestamps

eg：

查询日志通过服务名

docker service logs t_mserv_xgb_project --since 2022-04-22

查询日志通过taskId

获取服务对应的taskId

docker service ps t_mserv_xgb_project

通过taskId获取日志输出

docker service logs taskId --since 2022-04-22

发表于

网上搜索了很多文章都没解决，只好自己动手排查

通过对比可以正常转换的m3u8文件，发现出现问题的文件里少了 #EXTM3U

如果你遇到类似问题不妨检查下你的m3u8文件首行是不是#EXTM3U

发表于

https://users.cs.fiu.edu/~downeyt/webdev/Hibernate_Validator_Reference_Guide.htm

https://docs.jboss.org/hibernate/stable/validator/reference/en-US/html_single/#section-method-validation-prerequisite-relaxation
https://my.oschina.net/u/4390157/blog/3476201
https://docs.spring.io/spring-framework/docs/current/reference/html/web.html#mvc-ann-initbinder

<?xml version="1.0" encoding="UTF-8"?>
<validation-config
        xmlns="http://jboss.org/xml/ns/javax/validation/configuration"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://jboss.org/xml/ns/javax/validation/configuration validation-configuration-1.0.xsd">
    <default-provider>org.hibernate.validator.HibernateValidator</default-provider>

    <property name="hibernate.validator.allow_parameter_constraint_override">true</property>
    <property name="hibernate.validator.allow_multiple_cascaded_validation_on_result">true</property>
    <property name="hibernate.validator.allow_parallel_method_parameter_constraint">true</property>
</validation-config>

发表于

ConditionalOnNacosDiscoveryEnabled
@ConditionalOnProperty(value = “spring.cloud.nacos.discovery.enabled”, matchIfMissing = true)
@ConditionalOnProperty(value = “spring.cloud.service-registry.auto-registration.enabled”, matchIfMissing = true)

发表于

thread join 实现(java层)

public final void join() throws InterruptedException {
        join(0);
}

public final synchronized void join(long millis)
    throws InterruptedException {
        long base = System.currentTimeMillis();
        long now = 0;

        if (millis < 0) {
            throw new IllegalArgumentException("timeout value is negative");
        }

        if (millis == 0) {
            while (isAlive()) {
                //等待唤醒
                wait(0);
            }
        } else {
            while (isAlive()) {
                long delay = millis - now;
                if (delay <= 0) {
                    break;
                }
                wait(delay);
                now = System.currentTimeMillis() - base;
            }
        }
}

什么时候被唤醒呢

Thread的c++实现


static void ensure_join(JavaThread* thread) {
  // We do not need to grap the Threads_lock, since we are operating on ourself.
  Handle threadObj(thread, thread->threadObj());
  assert(threadObj.not_null(), "java thread object must exist");
  ObjectLocker lock(threadObj, thread);
  // Ignore pending exception (ThreadDeath), since we are exiting anyway
  thread->clear_pending_exception();
  // Thread is exiting. So set thread_status field in  java.lang.Thread class to TERMINATED.
  java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED);
  // Clear the native thread instance - this makes isAlive return false and allows the join()
  // to complete once we've done the notify_all below
  java_lang_Thread::set_thread(threadObj(), NULL);
  //唤醒所有执行了wait方法的线程
  lock.notify_all(thread);
  // Ignore pending exception (ThreadDeath), since we are exiting anyway
  thread->clear_pending_exception();
}

ensure_join在什么时候执行呢

// For any new cleanup additions, please check to see if they need to be applied to
// cleanup_failed_attach_current_thread as well.
void JavaThread::exit(bool destroy_vm, ExitType exit_type) {
    //...
    // Notify waiters on thread object. This has to be done after exit() is called
    // on the thread (if the thread is the last thread in a daemon ThreadGroup the
    // group should have the destroyed bit set before waiters are notified).
    ensure_join(s)
}

线程执行完毕（退出时）

发表于 
public class TestVolatile1{
    public volatile static int i=0;
    /**
     * 0 getstatic #2 <online/githuboy/concurrent/TestVolatile1.i>
     * 3 iconst_1
     * 4 iadd
     * 5 putstatic #2 <online/githuboy/concurrent/TestVolatile1.i>
     * 8 return
     */
    public void add(){
        i++;
    }
     public static void main(String[] args) throws InterruptedException {
        Thread t1 = new Thread(() -> {
            for (int i = 0; i < 10000; i++) {
                add();
            }
        });
        Thread t2 = new Thread(() -> {
            for (int i = 0; i < 10000; i++) {
                add();
            }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println(i);
    }
}

i = 10
t1
int temp = i + 1
//ThreadContextSwitch t2
t2
int tmep = i+ 1
i = 11
//write result to main memory

t1
continue execute
reread from temp
write i = 11
sync to main memory

发表于

今天访问这个网站查看i7-10700F
查看性能参数,谁知道给我弹出一个密码输入框
p1

然后需要关注公众号，才能获取密码，我开始以为是免费的。结果需要3元RMB.
本着研究的精神，决定看下网站是如何验证的。

按F12本以为能打开浏览器调试工具，结果直接弹出一个新的window.

好吧那只能通过菜单栏打开调试工具了。

通过快捷按键无法打开调试工具，说明该网站拦截了keyDown事件.

关键代码如下:

document.onkeydown=function(){
    var e = window.event||arguments[0];
    if(e.keyCode==123){
		window.open('/huoqumima.html?requestname=123', "_blank", "scrollbars=yes,resizable=1,modal=false,alwaysRaised=yes");
        return false;
    }else if((e.ctrlKey)&&(e.shiftKey)&&(e.keyCode==73)){
		window.open('/huoqumima.html?requestname=73', "_blank", "scrollbars=yes,resizable=1,modal=false,alwaysRaised=yes");
        return false;
    }else if((e.ctrlKey)&&(e.keyCode==85)){
		window.open('/huoqumima.html?requestname=85', "_blank", "scrollbars=yes,resizable=1,modal=false,alwaysRaised=yes");
        return false;
    }else if((e.ctrlKey)&&(e.keyCode==83)){
		window.open('/huoqumima.html?requestname=83', "_blank", "scrollbars=yes,resizable=1,modal=false,alwaysRaised=yes");
        return false;
    }
}

试着删除密码输入框的元素，结果整个网页reload.
逻辑如下
p2

既然不能删除元素，那就加个样式吧display: none;

p3

结果还是模糊的。

审查元素发现加了模糊过滤

p4

基本分析差不多了，就开始写代码吧。

用的油猴脚本管理器

// ==UserScript==
// @name         xincanshu crack
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Hidden password login dialog and blur mask,just for personal use
// @author       githuboy
// @match        *://*.xincanshu.com/*
// @grant        GM_log
// @run-at       document-body
// ==/UserScript==

(function() {
    'use strict';
    console.log("script init success");
    setTimeout(function(){
        var $ = jq;
        $(".zheceng").remove();
        $("#chart-wrapper").css("filter","blur(0px)");
        $(".paofenjietu").css("filter","blur(0px)");
        $("#chart-wrapper").css("color","red");
        var t = $(".tishitubiao");
        if(t){
          $(t).parent().css("display","none");
        }
    },0);
})();

很简单的逻辑，就改下相关Element的样式

reference

Tampermonkey documentation

Match patterns

发表于

基础参数

java -XX:+PrintFlagsFinal -version 获取JVM 所有提供的参数选项

formats
Type | Name | Operator | Value | Application

[Global flags]
     #type name                                     # =defaultValue :=overrideValue        #{}
     intx ActiveProcessorCount                      = -1                                  {product}
    uintx AdaptiveSizeDecrementScaleFactor          = 4                                   {product}
    uintx AdaptiveSizeMajorGCDecayTimeScale         = 10                                  {product}

java -XX:+PrintCommandLineFlags 打印当前运行JVM的参数

运行时

-Xmx20M 设置堆内存最大为20M

-Xms20M 设置堆内存最小为20M

-Xmn10M 设置新生代内存为10M

-verbose:gc 打印GC日志

-XX:SurvivorRatio=8 edian = 8/10 survivorFrom = 1/10, survivorTo = 1/10

-XX:+PrintGCDetails 打印gc详细日志

-XX:+PrintGCTimeStamps 打印gc时间戳

-Xloggc:gc.log gc日志输出到文件

-XX:+PrintStringTableStatistics 打印StringTable 和SymbolTable统计信息

References

https://chriswhocodes.com/hotspot_option_differences.html

https://foojay.io/command-line-arguments/openjdk-8/?tab=alloptions

https://chenweixiang.github.io/2020/05/29/english.html

jvm-options-cheat-sheet

jvm-ergonomics

VM

Java Platform, Standard Edition HotSpot Virtual Machine Garbage Collection Tuning Guide

发表于 分类于

  1. request /actuator/bus-refresh

  2. BusRefreshEndpoint received request

  3. ApplicationEventPublisher.publish(RemoteApplicationEvent)

  4. BusAutoConfiguration#

@EventListener(classes = RemoteApplicationEvent.class)
	public void acceptLocal(RemoteApplicationEvent event) {
		if (this.serviceMatcher.isFromSelf(event)
				&& !(event instanceof AckRemoteApplicationEvent)) {
			if (log.isDebugEnabled()) {
				log.debug("Sending remote event on bus: " + event);
			}
			//rabitmqTemplate send messsage
			this.cloudBusOutboundChannel.send(MessageBuilder.withPayload(event).build());
		}
	}

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