2 安装

2.1 准备环境

rocketmq-client-cpp 的安装是通过脚本 build.sh 实现的，不过在安装之前，需要确保开发环境中已经安装了下表所需的编译软件和库：

软件/库名版本号
操作系统CentOS Linux release 7.5.1804
gcc-c++（c++ compiler while need support C++11）4.8.5
cmake（build jsoncpp require it）2.8.12.2
automake（build libevent require it）1.13.4
autoconf（build libevent require it）2.69
libtool（build libevent require it）2.4.2
bzip2-devel（boost depend it）1.0.6
zlib-devel（boost depend it）1.2.7

2.2 安装

执行下列操作，安装 rocketmq-client-cpp。

  1. 从 GitHub 上下载并解压 rocketmq-client-cpp 源码包，链接为 https://github.com/apache/rocketmq-client-cpp/tree/1.2.1

  2. 进入到解压后的目录中，执行 build.sh 进行安装操作，命令如下：

[root@node3 /opt/rocketmq-client-cpp-1.2.1]# sh build.sh

说明：

  • build.sh 脚本会自动下载并构建安装 rocketmq-client-cpp 所需的依赖库（包括 libevent、json 和 boost），这些库将会被保存在 rocketmq-client-cpp 文件夹下。之后，该脚本就会构建 rocketmq-client 的静态库和动态库了。如果通过 build.sh 脚本构建依赖库失败，则需要通过 libevent、json、boost 的源码包手动构建这些依赖库了；
  • 在服务器未联网时，可以通过手动下载 libevent-release-2.0.22-stable.zip、jsoncpp-0.10.6.zip 及 boost_1_58_0.tar.gz 三个软件的源码包，然后将其上传到 rocketmq-client-cpp 解压后的目录下，再执行 build.sh 即可。
  1. 上一步的 build.sh 执行完成后，rocketmq-client-cpp 的静态库和动态库都会保存在 rocketmq-client-cpp/bin 目录下。另外，当使用这些库构建程序或库的时候，还需要链接其他几个库（-lpthread -lz -ldl -lrt）。编译命令示例如下：
g++ -o consumer_example consumer_example.cpp -lrocketmq -lpthread -lz -ldl -lrt

3 示例代码

这里给出两个简单的生产者和消费者的示例代码。

说明：生产环境代码使用的 rocketmq 的头文件及库文件的位置，需要根据实际情况存放。本文中是直接使用 rocketmq-client-cpp 源码包中的头文件及库文件。

3.1 生产者示例代码

生产者示例代码（SimpleProducer.cpp）的内容如下：

/*
* Description: Simple Producer demo
*/

#include <unistd.h>
#include <stdlib.h>
#include <iostream>
#include <string>
#include "CProducer.h"
#include "CMessage.h"
#include "CSendResult.h"

using namespace std;

// send message
void StartSendMessage(CProducer *producer)
{
    CSendResult result;

    // create message and set some values for it
    CMessage *msg = CreateMessage("Test_Topic");
    SetMessageTags(msg, "Test_Tag");
    SetMessageKeys(msg, "Test_Keys");
    
    for (int i = 0; i < 10; i++)
    {
        // construct different body
        string strMessageBody = "this is body number-" + to_string(i);
        
        SetMessageBody(msg, strMessageBody.c_str());
        // send message
        SendMessageSync(producer, msg, &result);

        cout << "send message[" << i << "], result status:" << (int)result.sendStatus << ", msgBody:" << strMessageBody << endl;
        usleep(1000000);
    }

    // destroy message
    DestroyMessage(msg);
}

int main(int argc, char *argv[])
{
    cout << "Producer Initializing....." << endl;

    // create producer and set some values for it
    CProducer *producer = CreateProducer("Group_producer");
    SetProducerNameServerAddress(producer, "192.168.213.128:9876;192.168.213.129:9876");
    // start producer
    StartProducer(producer);
    cout << "Producer start....." << endl;
    // send message
    StartSendMessage(producer);
    // shutdown producer
    ShutdownProducer(producer);
    // destroy producer
    DestroyProducer(producer);
    cout << "Producer Shutdown!" << endl;
    
    return 0;
}

编译并执行上述代码，过程信息结果如下：

[root@node3 /opt/liitdar/rocketmq]# g++ -o SimpleProducer SimpleProducer.cpp -I ./include/ -L/opt/rocketmq-client-cpp-1.2.1/bin/ -lrocketmq -lpthread -lz -ldl -lrt -std=c++11
[root@node3 /opt/liitdar/rocketmq]# ./SimpleProducer 
Producer Initializing.....
Producer start.....
send message[0], result status:0, msgBody:this is body number-0
send message[1], result status:0, msgBody:this is body number-1
send message[2], result status:0, msgBody:this is body number-2
send message[3], result status:0, msgBody:this is body number-3
send message[4], result status:0, msgBody:this is body number-4
send message[5], result status:0, msgBody:this is body number-5
send message[6], result status:0, msgBody:this is body number-6
send message[7], result status:0, msgBody:this is body number-7
send message[8], result status:0, msgBody:this is body number-8
send message[9], result status:0, msgBody:this is body number-9
Producer Shutdown!
[root@node3 /opt/liitdar/rocketmq]#

从上述结果能够看到，生产者程序成功地生产（向消息队列中发送）了 10 条消息。

3.2 消费者示例代码

Push 模式的消费者示例代码（SimplePushConsumer.cpp），内容如下：

/*
* Description: Simple push consumer demo
*/

#include <unistd.h>
#include <stdlib.h>
#include <iostream>
#include <string>
#include "CPushConsumer.h"
#include "CMessageExt.h"

using namespace std;

// consume message
int doConsumeMessage(struct CPushConsumer *consumer, CMessageExt *msgExt)
{
    cout << "[Consume Message] " << "MsgTopic:" << GetMessageTopic(msgExt) << ", MsgTags:" << GetMessageTags(msgExt)
        << ", MsgKeys:" << GetMessageKeys(msgExt) << ", MsgBody:" << GetMessageBody(msgExt) << endl;

    return E_CONSUME_SUCCESS;
}

int main(int argc, char *argv[])
{
    cout << "Push consumer Initializing...." << endl;
    // create push consumer and set some values for it
    CPushConsumer *consumer = CreatePushConsumer("Group_Consumer_Test");
    SetPushConsumerNameServerAddress(consumer, "192.168.213.128:9876;192.168.213.129:9876");
    Subscribe(consumer, "Test_Topic", "*");
    // register message callback
    RegisterMessageCallback(consumer, doConsumeMessage);
    // start push consumer
    StartPushConsumer(consumer);
    cout << "Push consumer start, and listening message within 1min..." << endl;
    for (int i = 0; i < 6; i++)
    {
        cout << "Already Running: " << (i * 10) << "S" << endl;
        usleep(10000000);
    }
    // shutdown push consumer
    ShutdownPushConsumer(consumer);
    // destroy push consumer
    DestroyPushConsumer(consumer);
    cout << "PushConsumer Shutdown!" << endl;
    
    return 0;
}

编译上述代码，得到可执行程序，命令如下：

[root@node3 /opt/liitdar/rocketmq]# g++ -o SimplePushConsumer SimplePushConsumer.cpp -I ./include/ -L/opt/rocketmq-client-cpp-1.2.1/bin/ -lrocketmq -lpthread -lz -ldl -lrt

执行上面生成的消费者程序，待消费者进入消息监听状态时，执行前面编译好的生产者程序（以产生消息），运行结果信息如下：

[root@node3 /opt/liitdar/rocketmq]# ./SimplePushConsumer 
Push consumer Initializing....
Push consumer start, and listening message within 1min...
Already Running: 0S
Already Running: 10S
Already Running: 20S
Already Running: 30S
Already Running: 40S
[Consume Message] MsgTopic:Test_Topic, MsgTags:Test_Tag, MsgKeys:Test_Keys, MsgBody:this is body number-0
[Consume Message] MsgTopic:Test_Topic, MsgTags:Test_Tag, MsgKeys:Test_Keys, MsgBody:this is body number-1
[Consume Message] MsgTopic:Test_Topic, MsgTags:Test_Tag, MsgKeys:Test_Keys, MsgBody:this is body number-2
[Consume Message] MsgTopic:Test_Topic, MsgTags:Test_Tag, MsgKeys:Test_Keys, MsgBody:this is body number-3
# rocketmq # c++ # 开发语言
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