RabbitMQ筆記二十三 :異步RPC之二(使用Spring AMQP實現RPC異步調用)

使用Spring AMQP實現RPC異步調用

示列

服務器端

應用啟動類代碼,

import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.ComponentScan;

import java.util.concurrent.TimeUnit;

@ComponentScan
public class Application {
    public static void main(String[] args) throws Exception{
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(Application.class);
        System.out.println("===server startup======");
        TimeUnit.SECONDS.sleep(120);
        context.close();
    }
}

配置類:
監聽了sms隊列,這個隊列將會是客戶端請求消息發送到的隊列,配置了適配器,適配器中去調用服務,適配器返回的值就是服務端返回給客戶端的RPC調用的結果

import org.springframework.amqp.core.AcknowledgeMode;
import org.springframework.amqp.rabbit.connection.CachingConnectionFactory;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.core.RabbitAdmin;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer;
import org.springframework.amqp.rabbit.listener.adapter.MessageListenerAdapter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MQConfig {

    @Bean
    public ConnectionFactory connectionFactory(){
        CachingConnectionFactory factory = new CachingConnectionFactory();
        factory.setUri("amqp://zhihao.miao:123456@192.168.1.131:5672");
        return factory;
    }

    @Bean
    public RabbitAdmin rabbitAdmin(ConnectionFactory connectionFactory){
        RabbitAdmin rabbitAdmin = new RabbitAdmin(connectionFactory);
        return rabbitAdmin;
    }

    @Bean
    public RabbitTemplate rabbitTemplate(ConnectionFactory connectionFactory){
        RabbitTemplate rabbitTemplate = new RabbitTemplate(connectionFactory);
        return rabbitTemplate;
    }

    @Bean
    public SimpleMessageListenerContainer messageListenerContainer(ConnectionFactory connectionFactory){
        SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
        container.setConnectionFactory(connectionFactory);
        container.setQueueNames("sms");
        container.setAcknowledgeMode(AcknowledgeMode.NONE);
        //使用適配器的方式
        container.setMessageListener(new MessageListenerAdapter(new SendSMSHandler()));
        return container;
    }
}

處理器,處理器中調用具體的服務,我們此列子中處理器方法返回的值是boolean類型

import java.util.concurrent.TimeUnit;

public class SendSMSHandler {

    public boolean handleMessage(byte[] body){
        String _body = new String(body);
        System.out.println(_body);
        String[] sms = _body.split(":");
        String phone = sms[0];
        String content = sms[1];

        boolean is = SendSMSTool.sendSMS(phone,content);

        try {
            TimeUnit.SECONDS.sleep(6);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        return is;
    }
}

服務接口

public class SendSMSTool {

    public static boolean sendSMS(String phone,String content){
        System.out.println("發送短信內容:【"+content+"】到手機號:"+phone);
        return phone.length() > 6;
    }
}

服務端步驟

  1. 消息處理方法,一定要有返回值,這個返回值就是就是server回復客戶端的結果。比如我們SendSMSHandler.handleMessage方法返回的值。

客戶端
應用啟動類:

import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageProperties;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.rabbit.support.CorrelationData;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.ComponentScan;

import java.util.UUID;
import java.util.concurrent.TimeUnit;

@ComponentScan
public class Application {
    public static void main(String[] args) throws Exception{
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(Application.class);

        RabbitTemplate rabbitTemplate = context.getBean(RabbitTemplate.class);

        //設置超時時間,單位是ms
        rabbitTemplate.setReplyTimeout(10000);

        String phone = "15634344321";
        String content ="周年慶,五折優惠";

        MessageProperties messageProperties = new MessageProperties();
        Message message = new Message((phone+":"+content).getBytes(),messageProperties);

        //rabbitTemplate.send("","sms",message);

        Message reply = rabbitTemplate.sendAndReceive("","sms",message,
                new CorrelationData(UUID.randomUUID().toString()));

        System.out.println(reply);
        System.out.println("message,body:"+new String(reply.getBody()));
        System.out.println("message,properties:"+reply.getMessageProperties());

        TimeUnit.SECONDS.sleep(30);
        context.close();
    }
}

配置類代碼:

import org.springframework.amqp.rabbit.connection.CachingConnectionFactory;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.core.RabbitAdmin;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MQConfig {

    @Bean
    public ConnectionFactory connectionFactory(){
        CachingConnectionFactory factory = new CachingConnectionFactory();
        factory.setUri("amqp://zhihao.miao:123456@192.168.1.131:5672");
        return factory;
    }

    @Bean
    public RabbitAdmin rabbitAdmin(ConnectionFactory connectionFactory){
        RabbitAdmin rabbitAdmin = new RabbitAdmin(connectionFactory);
        return rabbitAdmin;
    }

    @Bean
    public RabbitTemplate rabbitTemplate(ConnectionFactory connectionFactory){
        RabbitTemplate rabbitTemplate = new RabbitTemplate(connectionFactory);
        return rabbitTemplate;
    }
}

如果服務端睡眠6s,則客戶端通過sendAndReceive方法接收到的Message對象為空,怎樣設置呢?
客戶端通過設置rabbitTemplate.setReplyTimeout(10000);就可以了。

客戶端步驟

  1. 使用sendAndReceive方法發送消息,該方法返回一個Message對象,該對象就是server返回的結果
  2. sendAndReceive如果超過5s還沒有收到結果,則返回null,這個超時時間可以通過rabbitTemplate.setReplyTimeout()來進行設置
  3. server端返回的結果一定要注意,和MessageConverter有關,默認的org.springframework.amqp.support.converter.SimpleMessageConverter會把基本的數據類型轉換成Serializable對象,這樣的話,client端接收的也是序列化的java對象,所以,需要合理設置MessageConverter

示列代碼中服務端返回給客戶端的是Boolean類型,

啟動服務端客戶端代碼:
服務器打印控制臺打印:

15634344321:周年慶,五折優惠
發送短信內容:【周年慶,五折優惠】到手機號:15634344321

客戶端控制臺打印:

message,body:????sr??java.lang.Boolean? r???????Z??valuexp?
message,properties:MessageProperties [headers={}, timestamp=null, messageId=null, userId=null, receivedUserId=null, appId=null, clusterId=null, type=null, correlationId=null, correlationIdString=null, replyTo=null, contentType=application/x-java-serialized-object, contentEncoding=null, contentLength=0, deliveryMode=null, receivedDeliveryMode=PERSISTENT, expiration=null, priority=0, redelivered=false, receivedExchange=, receivedRoutingKey=amq.rabbitmq.reply-to.g2dkAB5yYWJiaXRAaVpicDFqY3d4N3NmYjFud3pyZWh5NloAAFu0AAAABwI=.kHL9zxtdQmtcxl0mQF8zrg==, receivedDelay=null, deliveryTag=1, messageCount=null, consumerTag=null, consumerQueue=null]

我們發現客戶端接收到的數據亂碼,將服務端的處理器的返回值改寫成String類型的,

import java.util.concurrent.TimeUnit;

public class SendSMSHandler {

    public String handleMessage(byte[] body){
        String _body = new String(body);
        System.out.println(_body);
        String[] sms = _body.split(":");
        String phone = sms[0];
        String content = sms[1];

        boolean is = SendSMSTool.sendSMS(phone,content);

        try {
            TimeUnit.SECONDS.sleep(6);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        return is ? "success":"false";
    }
}

此時發現客戶端接收的消息數據沒有亂碼,原因何在?我們總結一下就是服務器端處理器返回給客戶端boolean類型,那么返回的消息數據就亂碼,如果返回的是String類型,那么返回的消息數據就不會亂碼。

之前我們學習了org.springframework.amqp.support.converter.MessageConverter接口,當客戶端向服務端發送消息的時候會進行消息類型轉換,調用了fromMessage方法,而當服務器返回給客戶端的時候會將服務端的對象轉換成Message對象,很明顯調用的是toMessage方法。

我們知道org.springframework.amqp.support.converter.MessageConverter接口的默認實現是org.springframework.amqp.support.converter.SimpleMessageConverter,而toMessage方法的實現是在其繼承的對象AbstractMessageConverter中,

我們看到其AbstractMessageConverter.toMessage方法的實現邏輯是:

    @Override
    public final Message toMessage(Object object, MessageProperties messageProperties)
            throws MessageConversionException {
        if (messageProperties == null) {
            messageProperties = new MessageProperties();
        }
        //將對象轉換成Message對象
        Message message = createMessage(object, messageProperties);
        messageProperties = message.getMessageProperties();
        if (this.createMessageIds && messageProperties.getMessageId() == null) {
            messageProperties.setMessageId(UUID.randomUUID().toString());
        }
        return message;
    }

createMessage方法就是將對象轉換成Message對象,

    /**
     * Creates an AMQP Message from the provided Object.
     */
    @Override
    protected Message createMessage(Object object, MessageProperties messageProperties) throws MessageConversionException {
        byte[] bytes = null;
        if (object instanceof byte[]) {
            bytes = (byte[]) object;
            messageProperties.setContentType(MessageProperties.CONTENT_TYPE_BYTES);
        }
        else if (object instanceof String) {
            try {
                bytes = ((String) object).getBytes(this.defaultCharset);
            }
            catch (UnsupportedEncodingException e) {
                throw new MessageConversionException(
                        "failed to convert to Message content", e);
            }
            messageProperties.setContentType(MessageProperties.CONTENT_TYPE_TEXT_PLAIN);
            messageProperties.setContentEncoding(this.defaultCharset);
        }
        //因為boolean類型實現Serializable接口,所以會將其序列化
        else if (object instanceof Serializable) {
            try {
                bytes = SerializationUtils.serialize(object);
            }
            catch (IllegalArgumentException e) {
                throw new MessageConversionException(
                        "failed to convert to serialized Message content", e);
            }
            messageProperties.setContentType(MessageProperties.CONTENT_TYPE_SERIALIZED_OBJECT);
        }
        if (bytes != null) {
            messageProperties.setContentLength(bytes.length);
        }
        return new Message(bytes, messageProperties);
    }

我們在程序中將序列化對象直接轉換成字符串所以亂碼,而返回的是String類型的情形的時候先將字符串轉換成相應的字節數組,然后返回new Message(bytes, messageProperties);就不會亂碼。

繼續探討,當我們服務端返回的是一個對象的時候,客戶端會返回空
返回的對象:

public class SendStatus {

    private String phone;

    private String result;

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getResult() {
        return result;
    }

    public void setResult(String result) {
        this.result = result;
    }
}

將該對象返回:

public class SendSMSHandler {

    public SendStatus handleMessage(byte[] body){
        String _body = new String(body);
        System.out.println(_body);
        String[] sms = _body.split(":");
        String phone = sms[0];
        String content = sms[1];

        boolean is = SendSMSTool.sendSMS(phone,content);
        SendStatus sendStatus = new SendStatus();
        sendStatus.setPhone(phone);
        sendStatus.setResult(is ? "SUCCESS":"FAILURE");
        return sendStatus;
    }
}

服務端控制臺:

15634344321:周年慶,五折優惠
發送短信內容:【周年慶,五折優惠】到手機號:15634344321

客戶端:

message,body:
message,properties:MessageProperties [headers={}, timestamp=null, messageId=null, userId=null, receivedUserId=null, appId=null, clusterId=null, type=null, correlationId=null, correlationIdString=null, replyTo=null, contentType=application/octet-stream, contentEncoding=null, contentLength=0, deliveryMode=null, receivedDeliveryMode=PERSISTENT, expiration=null, priority=0, redelivered=false, receivedExchange=, receivedRoutingKey=amq.rabbitmq.reply-to.g2dkAB5yYWJiaXRAaVpicDFqY3d4N3NmYjFud3pyZWh5NloAAFxBAAAABwI=.01fOGW/nvS2nz6gKza+cjg==, receivedDelay=null, deliveryTag=1, messageCount=null, consumerTag=null, consumerQueue=null]

原因何在,因為我們定義的SendStatus不走createMessage中的所有if分支,最后返回的是null,怎么解決呢,要么自己去定義一個org.springframework.amqp.support.converter.MessageConverter實現,要么換一個默認的org.springframework.amqp.support.converter.MessageConverter實現。

改造后的示列

使用AMQP自帶的消息類型轉換器Jackson2JsonMessageConverter
服務端

應用啟動類,

import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.ComponentScan;

import java.util.concurrent.TimeUnit;

@ComponentScan
public class Application {
    public static void main(String[] args) throws Exception{
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(Application.class);
        System.out.println("===server startup======");
        TimeUnit.SECONDS.sleep(120);
        context.close();
    }
}

配置類,添加自定義的消息轉換器

import org.springframework.amqp.core.AcknowledgeMode;
import org.springframework.amqp.rabbit.connection.CachingConnectionFactory;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.core.RabbitAdmin;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer;
import org.springframework.amqp.rabbit.listener.adapter.MessageListenerAdapter;
import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MQConfig {

    @Bean
    public ConnectionFactory connectionFactory(){
        CachingConnectionFactory factory = new CachingConnectionFactory();
        factory.setUri("amqp://zhihao.miao:123456@192.168.1.131:5672");
        return factory;
    }

    @Bean
    public RabbitAdmin rabbitAdmin(ConnectionFactory connectionFactory){
        RabbitAdmin rabbitAdmin = new RabbitAdmin(connectionFactory);
        return rabbitAdmin;
    }

    @Bean
    public RabbitTemplate rabbitTemplate(ConnectionFactory connectionFactory){
        RabbitTemplate rabbitTemplate = new RabbitTemplate(connectionFactory);
        return rabbitTemplate;
    }

    @Bean
    public SimpleMessageListenerContainer messageListenerContainer(ConnectionFactory connectionFactory){
        SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
        container.setConnectionFactory(connectionFactory);
        container.setQueueNames("sms");
        container.setAcknowledgeMode(AcknowledgeMode.NONE);
        //使用適配器的方式
        container.setMessageListener(new MessageListenerAdapter(new SendSMSHandler(),new Jackson2JsonMessageConverter()));
        return container;
    }
}

處理器handler,返回自定義的SendStatus類型

import java.util.concurrent.TimeUnit;

public class SendSMSHandler {

    public SendStatus handleMessage(byte[] body){
        String _body = new String(body);
        System.out.println(_body);
        String[] sms = _body.split(":");
        String phone = sms[0];
        String content = sms[1];

        boolean is = SendSMSTool.sendSMS(phone,content);
        SendStatus sendStatus = new SendStatus();
        sendStatus.setPhone(phone);
        sendStatus.setResult(is ? "SUCCESS":"FAILURE");

        try {
            TimeUnit.SECONDS.sleep(6);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        return sendStatus;
    }
}

接口服務,

public class SendSMSTool {

    public static boolean sendSMS(String phone,String content){
        System.out.println("發送短信內容:【"+content+"】到手機號:"+phone);
        return phone.length() > 6;
    }
}

服務端返回的對象,

public class SendStatus {
    private String phone;

    private String result;

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getResult() {
        return result;
    }

    public void setResult(String result) {
        this.result = result;
    }
}

客戶端
應用啟動類,

import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageProperties;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.rabbit.support.CorrelationData;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.ComponentScan;

import java.util.UUID;
import java.util.concurrent.TimeUnit;

@ComponentScan
public class Application {
    public static void main(String[] args) throws Exception{
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(Application.class);

        RabbitTemplate rabbitTemplate = context.getBean(RabbitTemplate.class);

        //設置超時時間,單位是ms
        rabbitTemplate.setReplyTimeout(10000);

        String phone = "15634344321";
        String content ="周年慶,五折優惠";

        MessageProperties messageProperties = new MessageProperties();
        Message message = new Message((phone+":"+content).getBytes(),messageProperties);

        //rabbitTemplate.send("","sms",message);

        Message reply = rabbitTemplate.sendAndReceive("","sms",message,
                new CorrelationData(UUID.randomUUID().toString()));

        System.out.println(reply);
        System.out.println("message,body:"+new String(reply.getBody()));
        System.out.println("message,properties:"+reply.getMessageProperties());

        TimeUnit.SECONDS.sleep(30);
        context.close();
    }
}

配置類

import org.springframework.amqp.rabbit.connection.CachingConnectionFactory;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.core.RabbitAdmin;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MQConfig {

    @Bean
    public ConnectionFactory connectionFactory(){
        CachingConnectionFactory factory = new CachingConnectionFactory();
        factory.setUri("amqp://zhihao.miao:123456@192.168.1.131:5672");
        return factory;
    }

    @Bean
    public RabbitAdmin rabbitAdmin(ConnectionFactory connectionFactory){
        RabbitAdmin rabbitAdmin = new RabbitAdmin(connectionFactory);
        return rabbitAdmin;
    }

    @Bean
    public RabbitTemplate rabbitTemplate(ConnectionFactory connectionFactory){
        RabbitTemplate rabbitTemplate = new RabbitTemplate(connectionFactory);
        return rabbitTemplate;
    }
}

啟動服務器客戶端,客戶端返回

message,body:{"phone":"15634344321","result":"SUCCESS"}
message,properties:MessageProperties [headers={__TypeId__=rpc.server.SendStatus}, timestamp=null, messageId=null, userId=null, receivedUserId=null, appId=null, clusterId=null, type=null, correlationId=null, correlationIdString=null, replyTo=null, contentType=application/json, contentEncoding=UTF-8, contentLength=0, deliveryMode=null, receivedDeliveryMode=PERSISTENT, expiration=null, priority=0, redelivered=false, receivedExchange=, receivedRoutingKey=amq.rabbitmq.reply-to

返回了SendStatus的JSON格式,因為使用了Jackson2JsonMessageConverter消息類型轉換器。

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