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SpringBoot集成JavaDSL的实现代码

Spring Integration Java DSL已经融合到Spring Integration Core 5.0,这是一个聪明而明显的举动,因为:

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  • 基于Java Config启动新Spring项目的每个人都使用它
  • SI Java DSL使您可以使用Lambdas等新的强大Java 8功能
  • 您可以使用 基于IntegrationFlowBuilder的Builder模式构建流

让我们看看基于ActiveMQ JMS的示例如何使用它。

Maven依赖:


  
    org.springframework.boot
    spring-boot-starter-activemq
  

  
    org.springframework.integration
    spring-integration-core
  

  
    org.springframework.integration
    spring-integration-jms
  

  
    org.springframework.boot
    spring-boot-starter-test
    test
  

  
    org.apache.activemq
    activemq-kahadb-store
  

  
  
    org.springframework.integration
    spring-integration-java-dsl
    1.2.3.RELEASE
  

示例1:Jms入站网关

我们有以下ServiceActivator:

@Service
public class ActiveMQEndpoint {
  @ServiceActivator(inputChannel = "inboundChannel")
  public void processMessage(final String inboundPayload) {
    System.out.println("Inbound message: "+inboundPayload);
  }
}

如果您想使用SI Java DSL 将inboundPayload从Jms队列发送到Gateway风格的激活器,那么请使用DSLJms工厂:

@Bean
public DynamicDestinationResolver dynamicDestinationResolver() {
  return new DynamicDestinationResolver();
}

@Bean
public ActiveMQConnectionFactory connectionFactory() {
  return new ActiveMQConnectionFactory();
}

@Bean
public DefaultMessageListenerContainer listenerContainer() {
  final DefaultMessageListenerContainer defaultMessageListenerContainer = new DefaultMessageListenerContainer();
  defaultMessageListenerContainer.setDestinationResolver(dynamicDestinationResolver());
  defaultMessageListenerContainer.setConnectionFactory(connectionFactory());
  defaultMessageListenerContainer.setDestinationName("jms.activeMQ.Test");
  return defaultMessageListenerContainer;
}

@Bean
public MessageChannel inboundChannel() {
  return MessageChannels.direct("inboundChannel").get();
}

@Bean
public JmsInboundGateway dataEndpoint() {
  return Jms.inboundGateway(listenerContainer())
      .requestChannel(inboundChannel()).get();
}

通过dataEndpoint bean 返回JmsInboundGatewaySpec,您还可以向SI通道或Jms目标发送回复。查看文档。

示例2:Jms消息驱动的通道适配器

如果您正在寻找替换消息驱动通道适配器的XML JMS配置,那么JmsMessageDrivenChannelAdapter是一种适合您的方式:

@Bean
public DynamicDestinationResolver dynamicDestinationResolver() {
  return new DynamicDestinationResolver();
}

@Bean
public ActiveMQConnectionFactory connectionFactory() {
  return new ActiveMQConnectionFactory();
}

@Bean
public DefaultMessageListenerContainer listenerContainer() {
  final DefaultMessageListenerContainer defaultMessageListenerContainer = new DefaultMessageListenerContainer();
  defaultMessageListenerContainer.setDestinationResolver(dynamicDestinationResolver());
  defaultMessageListenerContainer.setConnectionFactory(connectionFactory());
  defaultMessageListenerContainer.setDestinationName("jms.activeMQ.Test");
  return defaultMessageListenerContainer;
}

@Bean
public MessageChannel inboundChannel() {
  return MessageChannels.direct("inboundChannel").get();
}

@Bean
public JmsMessageDrivenChannelAdapter dataEndpoint() {
  final ChannelPublishingJmsMessageListener channelPublishingJmsMessageListener =
      new ChannelPublishingJmsMessageListener();
  channelPublishingJmsMessageListener.setExpectReply(false);
  final JmsMessageDrivenChannelAdapter messageDrivenChannelAdapter = new
      JmsMessageDrivenChannelAdapter(listenerContainer(), channelPublishingJmsMessageListener
      );

  messageDrivenChannelAdapter.setOutputChannel(inboundChannel());
  return messageDrivenChannelAdapter;
}

与前面的示例一样,入站有效负载如样本1中一样发送给激活器。

示例3:使用JAXB的Jms消息驱动的通道适配器

在典型的场景中,您希望通过Jms接受XML作为文本消息,将其转换为JAXB存根并在服务激活器中处理它。我将向您展示如何使用SI Java DSL执行此操作,但首先让我们为xml处理添加两个依赖项:


    org.springframework.integration
    spring-integration-xml
  

  
    org.springframework
    spring-oxm
  

我们将通过JMS接受shiporders ,所以首先XSD命名为shiporder.xsd:

<?xml version="1.0" encoding="UTF-8" ?>


  
    
      
        
        
          
            
              
              
              
              
            
          
        
        
          
            
              
              
              
              
            
          
        
      
      
    
  



新增JAXB maven plugin 生成JAXB存根:

 
      org.codehaus.mojo
      jaxb2-maven-plugin
      2.3.1
      
        
          xjc-schema1
          
            xjc
          
          
            
            
              src/main/resources/xsds/shiporder.xsd
            

            
            com.example.stubs
            src/main/java
            false
          
        
      
    

我们已经准备好了存根类和一切,现在使用Jaxb magic的Java DSL JMS消息驱动适配器:

/**
 * Sample 3: Jms message driven adapter with JAXB
 */
@Bean
public JmsMessageDrivenChannelAdapter dataEndpoint() {
  final ChannelPublishingJmsMessageListener channelPublishingJmsMessageListener =
      new ChannelPublishingJmsMessageListener();
  channelPublishingJmsMessageListener.setExpectReply(false);
  channelPublishingJmsMessageListener.setMessageConverter(new MarshallingMessageConverter(shipOrdersMarshaller()));
  final JmsMessageDrivenChannelAdapter messageDrivenChannelAdapter = new
      JmsMessageDrivenChannelAdapter(listenerContainer(), channelPublishingJmsMessageListener
  );

  messageDrivenChannelAdapter.setOutputChannel(inboundChannel());
  return messageDrivenChannelAdapter;
}

@Bean
public Jaxb2Marshaller shipOrdersMarshaller() {
  Jaxb2Marshaller marshaller = new Jaxb2Marshaller();
  marshaller.setContextPath("com.example.stubs");
  return marshaller;
}

XML配置在Java中使用它可以为您提供如此强大的功能和灵活性。要完成此示例,inboundChannel的服务激活器将如下所示:

/**
 * Sample 3
 * @param shiporder
 */
@ServiceActivator(inputChannel = "inboundChannel")
public void processMessage(final Shiporder shiporder) {
  System.out.println(shiporder.getOrderid());
  System.out.println(shiporder.getOrderperson());
}

要测试流,您可以使用以下XML通过JConsole发送到JMS队列:

 <?xml version="1.0" encoding="UTF-8"?>    
  
   John Smith
    
     Ola Nordmann
     
Langgt 23
4000 Stavanger Norway
Empire Burlesque Special Edition 1 10.90 Hide your heart 1 9.90

示例4:具有JAXB和有效负载根路由的Jms消息驱动的通道适配器

另一种典型情况是接受XML作为JMS文本消息,将其转换为JAXB存根并根据有效负载根类型将有效负载路由到某个服务激活器。当然SI Java DSL支持所有类型的路由,我将向您展示如何根据有效载荷类型进行路由。

首先,将以下XSD添加到shiporder.xsd所在的文件夹中,并将其命名为purchaseorder.xsd:


  
    
      
        
        
      
      
    
  

  
    
      
      
      
      
      
    
    
  


然后添加到jaxb maven插件配置:

 
      org.codehaus.mojo
      jaxb2-maven-plugin
      2.3.1
      
        
          xjc-schema1
          
            xjc
          
          
            
            
              src/main/resources/xsds/shiporder.xsd
              src/main/resources/xsds/purchaseorder.xsd
            

            
            com.example.stubs
            src/main/java
            false
          
        
      
    

运行mvn clean install以生成新XSD的JAXB存根。现在承诺有效负载根映射:

@Bean
public Jaxb2Marshaller ordersMarshaller() {
  Jaxb2Marshaller marshaller = new Jaxb2Marshaller();
  marshaller.setContextPath("com.example.stubs");
  return marshaller;
}

/**
 * Sample 4: Jms message driven adapter with Jaxb and Payload routing.
 * @return
 */
@Bean
public JmsMessageDrivenChannelAdapter dataEndpoint() {
  final ChannelPublishingJmsMessageListener channelPublishingJmsMessageListener =
      new ChannelPublishingJmsMessageListener();
  channelPublishingJmsMessageListener.setMessageConverter(new MarshallingMessageConverter(ordersMarshaller()));
  final JmsMessageDrivenChannelAdapter messageDrivenChannelAdapter = new
      JmsMessageDrivenChannelAdapter(listenerContainer(), channelPublishingJmsMessageListener
  );

  messageDrivenChannelAdapter.setOutputChannel(inboundChannel());
  return messageDrivenChannelAdapter;
}

@Bean
public IntegrationFlow payloadRootMapping() {
  return IntegrationFlows.from(inboundChannel()).>route(Object::getClass, m->m
      .subFlowMapping(Shiporder.class, sf->sf.handle((MessageHandler) message -> {
        final Shiporder shiporder = (Shiporder) message.getPayload();
        System.out.println(shiporder.getOrderperson());
        System.out.println(shiporder.getOrderid());
      }))
      .subFlowMapping(PurchaseOrder.class, sf->sf.handle((MessageHandler) message -> {
        final PurchaseOrder purchaseOrderType = (PurchaseOrder) message.getPayload();
        System.out.println(purchaseOrderType.getBillTo().getName());
      }))
  ).get();
}

注意payloadRootMapping bean,让我们解释一下重要的部分:

  • > route - 表示来自inboundChannel的输入将是Object,并且将根据Class <?>执行路由
  • subFlowMapping(Shiporder.class.. - ShipOders的处理。
  • subFlowMapping(PurchaseOrder.class ... - 处理PurchaseOrders。

要测试ShipOrder有效负载,请使用示例3中的XML,以测试PurchaseOrder有效负载,使用以下XML:

<?xml version="1.0" encoding="utf-8"?> 
 
  
  name1 
  street1 
  city1 
  state1 
  1 
  
  
  name2 
  street2 
  city2 
  state2 
  -79228162514264337593543950335 
  
  
  name1 
  street1 
  city1 
  state1 
  1 
  

应根据subflow 子流Map路由两个有效载荷。

示例5:IntegrationFlowAdapter

除了企业集成模式的其他实现(check them out)),我需要提到IntegrationFlowAdapter。通过扩展此类并实现buildFlow方法,如:

[url=https://bitbucket.org/Component/]@Component[/url] 
public class MyFlowAdapter extends IntegrationFlowAdapter {

@Autowired
 private ConnectionFactory rabbitConnectionFactory;

 @Override
 protected IntegrationFlowDefinition<?> buildFlow() {
   return from(Amqp.inboundAdapter(this.rabbitConnectionFactory, "myQueue"))
        .transform(String::toLowerCase)
        .channel(c -> c.queue("myFlowAdapterOutput"));
 }

你可以将bean的重复声明包装成一个组件并给它们所需的流量。然后可以配置这样的组件并将其作为一个类实例提供给调用代码!

因此,让我们举例说明这个repo中的示例3更短一些,并为所有JmsEndpoints定义基类,并在其中定义重复bean:

public class JmsEndpoint extends IntegrationFlowAdapter {

  private String queueName;

  private String channelName;

  private String contextPath;

  /**
   * @param queueName
   * @param channelName
   * @param contextPath
   */
  public JmsEndpoint(String queueName, String channelName, String contextPath) {
    this.queueName = queueName;
    this.channelName = channelName;
    this.contextPath = contextPath;
  }

  @Override
  protected IntegrationFlowDefinition<?> buildFlow() {
    return from(Jms.messageDrivenChannelAdapter(listenerContainer())
      .jmsMessageConverter(new MarshallingMessageConverter(shipOrdersMarshaller()))
    ).channel(channelName);
  }

  @Bean
  public Jaxb2Marshaller shipOrdersMarshaller() {
    Jaxb2Marshaller marshaller = new Jaxb2Marshaller();
    marshaller.setContextPath(contextPath);
    return marshaller;
  }

  @Bean
  public DynamicDestinationResolver dynamicDestinationResolver() {
    return new DynamicDestinationResolver();
  }

  @Bean
  public ActiveMQConnectionFactory connectionFactory() {
    return new ActiveMQConnectionFactory();
  }

  @Bean
  public DefaultMessageListenerContainer listenerContainer() {
    final DefaultMessageListenerContainer defaultMessageListenerContainer = new DefaultMessageListenerContainer();
    defaultMessageListenerContainer.setDestinationResolver(dynamicDestinationResolver());
    defaultMessageListenerContainer.setConnectionFactory(connectionFactory());
    defaultMessageListenerContainer.setDestinationName(queueName);
    return defaultMessageListenerContainer;
  }

  @Bean
  public MessageChannel inboundChannel() {
    return MessageChannels.direct(channelName).get();
  }
}

现在声明特定队列的Jms端点很容易:

@Bean
public JmsEndpoint jmsEndpoint() {
  return new JmsEndpoint("jms.activeMQ.Test", "inboundChannel", "com.example.stubs");
}

inboundChannel的服务激活器:

/**
 * Sample 3, 5
 * @param shiporder
 */
@ServiceActivator(inputChannel = "inboundChannel")
public void processMessage(final Shiporder shiporder) {
  System.out.println(shiporder.getOrderid());
  System.out.println(shiporder.getOrderperson());
}

您不应该错过在项目中使用IntegrationFlowAdapter。我喜欢它的概念。

我最近在Embedit的新的基于Spring Boot的项目中开始使用Spring Integration Java DSL 。即使有一些配置,我发现它非常有用。

  • 它很容易调试。不添加像wiretap这样的配置。
  • 阅读起来要容易得多。是的,即使是lambdas!
  • 它很强大。在Java配置中,您现在有很多选择。

源码地址:https://bitbucket.org/tomask79/spring-integration-java-dsl 

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持创新互联。


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