RocketMQ学习笔记(一)eclipse版的quickstart

学而时习之,不亦说乎!

自己搭建个学习用的RocketMQ总是很麻烦,需要虚拟机环境,网络,需要安装rocketmq,启动。时间久了再去看,又不知道这个虚拟机是干嘛的了。

直接在eclipse中启动,简单省事,用的时候启动,用完关掉就行了。

先看下图,给还没开始的你一点信心。

RocketMQ学习笔记(一)eclipse版的quickstart_第1张图片

 

RocketMQ

  • 官网:http://rocketmq.apache.org/

  • 源码:https://github.com/apache/rocketmq

  • github:https://github.com/apache/rocketmq.git

  • 扩展源码:https://github.com/apache/rocketmq-externals

  • github:https://github.com/apache/rocketmq-externals.git

  • Apache RocketMQ™ is an open source distributed messaging and streaming data platform.

  • Apache RocketMQ™是一个开源分布式消息和流数据平台

Quick Start(先看看官网的怎么玩的)

This quick start guide is a detailed instruction of setting up RocketMQ messaging system on your local machine to send and receive messages.

这个快速启动指南详细说明了如何在本地机器上设置RocketMQ消息传递系统来发送和接收消息。

Prerequisite

The following softwares are assumed installed:

  1. 64bit OS, Linux/Unix/Mac is recommended;

  2. 64bit JDK 1.8+;

  3. Maven 3.2.x

  4. Git

Download & Build from Release

Click here to download the 4.3.0 source release. Also you could download a binary release from here.

Now execute the following commands to unpack 4.3.0 source release and build the binary artifact.

  > unzip rocketmq-all-4.3.0-source-release.zip
  > cd rocketmq-all-4.3.0/
  > mvn -Prelease-all -DskipTests clean install -U
  > cd distribution/target/apache-rocketmq

Start Name Server

  > nohup sh bin/mqnamesrv &
  > tail -f ~/logs/rocketmqlogs/namesrv.log
  The Name Server boot success...

Start Broker

  > nohup sh bin/mqbroker -n localhost:9876 &
  > tail -f ~/logs/rocketmqlogs/broker.log 
  The broker[%s, 172.30.30.233:10911] boot success...

Send & Receive Messages

Before sending/receiving messages, we need to tell clients the location of name servers. RocketMQ provides multiple ways to achieve this. For simplicity, we use environment variable NAMESRV_ADDR

 > export NAMESRV_ADDR=localhost:9876
 > sh bin/tools.sh org.apache.rocketmq.example.quickstart.Producer
 SendResult [sendStatus=SEND_OK, msgId= ...
​
 > sh bin/tools.sh org.apache.rocketmq.example.quickstart.Consumer
 ConsumeMessageThread_%d Receive New Messages: [MessageExt...

Shutdown Servers

> sh bin/mqshutdown broker
The mqbroker(36695) is running...
Send shutdown request to mqbroker(36695) OK
​
> sh bin/mqshutdown namesrv
The mqnamesrv(36664) is running...
Send shutdown request to mqnamesrv(36664) OK

Start In STS

参考官网的quick start,实现STS的quick start。以后再也不用去虚拟机找rocketmq了!

导入源码到STS

  1. 安装STS(Spring Tool Suite)或者Eclipse

  2. 下载rocketmq和rocketmq-externals源码

  3. 新建rocketmq和rocketmq-externals各自的Java Working Set

  4. 分别导入源码到各自的Java Working Set

  5. 解决报错,ignore或者update

  6. 修改下设置,比如字体什么的

接下来干什么?

要在STS中启动RocketMQ,那么首先分析下官方提供的脚本是怎么启动的。对照官网quick start开始下面的流程。

分析mqnamesrv

  • 位置:rocketmq\distribution\bin\

#!/bin/sh
#[ -z STRING ]  “STRING” 的长度为零则为真
# [ -h FILE ]  如果 FILE 存在且是一个符号连接则为真。
#$0 Shell本身的文件名
#$@ 是传给脚本的所有参数列表
if [ -z "$ROCKETMQ_HOME" ] ; then
  ## resolve links - $0 may be a link to maven's home
  PRG="$0"
​
  # need this for relative symlinks
  while [ -h "$PRG" ] ; do
    ls=`ls -ld "$PRG"`
    link=`expr "$ls" : '.*-> \(.*\)$'`
    if expr "$link" : '/.*' > /dev/null; then
      PRG="$link"
    else
      PRG="`dirname "$PRG"`/$link"
    fi
  done
​
  saveddir=`pwd`
​
  ROCKETMQ_HOME=`dirname "$PRG"`/..
​
  # make it fully qualified
  ROCKETMQ_HOME=`cd "$ROCKETMQ_HOME" && pwd`
​
  cd "$saveddir"
fi
#这个if的作用就是没有ROCKETMQ_HOME环境变量的时候,设置一个ROCKETMQ_HOME环境变量。明显我们进来的时候是没有的,通过一系列操作后,ROCKETMQ_HOME就被设置为当前文件所在目录的上层目录,这里就是rocketmq\distribution\bin
​
export ROCKETMQ_HOME
​
sh ${ROCKETMQ_HOME}/bin/runserver.sh org.apache.rocketmq.namesrv.NamesrvStartup $@
#这个shell的目的是在当前目录执行runserver.sh org.apache.rocketmq.namesrv.NamesrvStartup $@

 



分析NamesrvStartup

#!/bin/sh
#[ -e FILE ]  如果 FILE 存在则为真
error_exit ()
{
    echo "ERROR: $1 !!"
    exit 1
}
​
[ ! -e "$JAVA_HOME/bin/java" ] && JAVA_HOME=$HOME/jdk/java
[ ! -e "$JAVA_HOME/bin/java" ] && JAVA_HOME=/usr/java
[ ! -e "$JAVA_HOME/bin/java" ] && error_exit "Please set the JAVA_HOME variable in your environment, We need java(x64)!"
#这儿是确保找到AVA_HOME,不然就直接报错了
export JAVA_HOME
export JAVA="$JAVA_HOME/bin/java"
export BASE_DIR=$(dirname $0)/..
#BASE_DIR就是上一级的bin目录,也就是../bin
export CLASSPATH=.:${BASE_DIR}/conf:${CLASSPATH}
#把上级目录下的conf目录,也就是../conf加到CLASSPATH
​
#===========================================================================================
# JVM Configuration
#===========================================================================================
JAVA_OPT="${JAVA_OPT} -server -Xms4g -Xmx4g -Xmn2g -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=320m"
#运行在server模式;堆内存固定为4g,新生代2g,元空间128m,最大元空间320m
JAVA_OPT="${JAVA_OPT} -XX:+UseConcMarkSweepGC -XX:+UseCMSCompactAtFullCollection -XX:CMSInitiatingOccupancyFraction=70 -XX:+CMSParallelRemarkEnabled -XX:SoftRefLRUPolicyMSPerMB=0 -XX:+CMSClassUnloadingEnabled -XX:SurvivorRatio=8  -XX:-UseParNewGC"
#使用CMS垃圾收集器;在FULL GC的时候,对年老代的压缩;使用70%后开始CMS收集;降低标记停顿;每兆堆空闲空间中SoftReference的存活时间=0;新生代比例:1:1:8;新生代使用ParNew
JAVA_OPT="${JAVA_OPT} -verbose:gc -Xloggc:/dev/shm/rmq_srv_gc.log -XX:+PrintGCDetails"
#输出虚拟机中GC的详细情况;gc日志地址/dev/shm/rmq_srv_gc.log ;-XX:+PrintGCDetails
JAVA_OPT="${JAVA_OPT} -XX:-OmitStackTraceInFastThrow"
#禁用吃异常优化
JAVA_OPT="${JAVA_OPT}  -XX:-UseLargePages"
#启用大内存分页
JAVA_OPT="${JAVA_OPT} -Djava.ext.dirs=${JAVA_HOME}/jre/lib/ext:${BASE_DIR}/lib"
#指定扩展类加载器加载的包路径
#JAVA_OPT="${JAVA_OPT} -Xdebug -Xrunjdwp:transport=dt_socket,address=9555,server=y,suspend=n"
#开启远程debug
JAVA_OPT="${JAVA_OPT} ${JAVA_OPT_EXT}"
JAVA_OPT="${JAVA_OPT} -cp ${CLASSPATH}"
​
$JAVA ${JAVA_OPT} $@

 

那么我们要干什么呢?

  • 从shell看,我们要设置一个ROCKET_HOME,我们的启动类是org.apache.rocketmq.namesrv.NamesrvStartup

  • private String rocketmqHome = System.getProperty(MixAll.ROCKETMQ_HOME_PROPERTY, System.getenv(MixAll.ROCKETMQ_HOME_ENV));

  • ROCKET_HOME主要就是为了找到日志配置文件,那么可以手动指定一下环境

  • 查看日志配置文件,使用到了user.home,那么手动写一个

  • 虚拟机的启动优化,参数,可以在启动的时候加上,也可以不管

修改rocketmq-namesrv项目下的NamesrvStartup.java

    public static void main(String[] args) {
        System.setProperty("rocketmq.home.dir", "../distribution");//新增
        System.setProperty("user.home", ".");//新增
        main0(args);
    } 

接下来

Run As ->Java Application

The Name Server boot success. serializeType=JSON

然后用jconsole大致看一下,内存消耗的确不大,但是启动指定几个g是几个意思?

刷新一下,当前目录就可以看到日志了

同样的方法,启动brocker

shell文件大同小异,main方法如下,新增三行代码

rocketmq-brocker项目下的BrokerStartup.java

   public static void main(String[] args) {
        System.setProperty("rocketmq.home.dir", "../distribution");//新增
        System.setProperty("user.home", ".");//新增
        args=new String[]{"-n","localhost:9876"};//新增
        start(createBrokerController(args));
    }

Run As ->Java Application

启动后刷新当前项目,可以看到日志目录和数据目录

启动控制台

  1. 我们已经导入了rocketmq-externals,找到rocketmq-console-ng项目

  2. 修改aplication.properties:rocketmq.config.namesrvAddr=localhost:9876

  3. 运行App类的main方法:Run As ->Java Application

  4. 访问localhost:8080

  5. 至此,我们一共启动了三个项目,一个nameserver,一个broker,一个console;nameserver类似于zk,broker用于实际消息收发,console用于可视化监控查看。

生产消费消息

找到项目:rocketmq-example

启动生产者

打开org.apache.rocketmq.example.quickstart.Producer类,加上producer.setNamesrvAddr("localhost:9876");

运行

启动消费者

打开org.apache.rocketmq.example.quickstart.Consumer类,加上consumer.setNamesrvAddr("localhost:9876");

运行

 

 

转载于:https://www.cnblogs.com/zby9527/p/9977810.html

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