Question

我需要能够将转换器添加到由MVC应用程序管理的正在运行的Spring集成应用程序上下文中，为了实现这一点，我从一个简单的POC开始，我在运行时加载一个新的转换器（这个转换器不是在启动时扫描），这个POC作为一个独立的Java应用程序运行，只包含spring集成库，这里是主类。

@Component
public class DynamicApplication {

    @Autowired
    private ConfigurableApplicationContext appContext;

    @Autowired
    private BeanFactory beanFactory;

    private Map<String, String> channelsMap = new HashMap<String, String>();

    private Map<String, String> inboundGWMap = new HashMap<String, String>();

    public static void main(String a[]) throws Exception{
        DynamicApplication dynamicApplication = new DynamicApplication();
        GenericXmlApplicationContext context = dynamicApplication.setupContext();

        DynamicApplication localDynamicApplication = context.getBean(DynamicApplication.class);

        //then we wait for input to add new classes
        final Scanner scanner = new Scanner(System.in);

        while (true) {

            final String input = scanner.nextLine();

            if("q".equals(input.trim())) {
                break;
            }
            else{
                //in the case we got a package definition to be scanned
                localDynamicApplication.addClassesFromAnnotatedPackage(input);
                }
        }
    }

    public  GenericXmlApplicationContext setupContext() {
        final GenericXmlApplicationContext context = new GenericXmlApplicationContext();
        context.load("configuration/inbound-grand-central-configuration.xml");
        context.registerShutdownHook();
        context.refresh();
        DynamicApplication dynamicApplication = context.getBean(DynamicApplication.class);
        for(int i = 0 ; i < 1 ; i++){
            TcpInboundGateway listener = dynamicApplication.createTcpInboundGateway("server" + i, 9877 + i);
            listener.start();
        }

        return context;
    }


}

一个非常简单的服务激活器

package com.client.connector.inbound.config;

@MessageEndpoint
public class BussinesService {

    @ServiceActivator(inputChannel="toBSChannel")
    public String processIncomingMessage(String message) {
        System.out.println("Bussines logic: " + message);

        return "respondemos:" + message;

    }

}

还有一个初始转换器包com.client.connector.inbound.config;

@MessageEndpoint
public class ISOConverter {

    @Transformer(inputChannel="iSOConverterChannel", outputChannel="toBSChannel")
    public String iSOConverter(Object payload) throws Exception {
        System.out.println("ISO Conversion place");
        if (payload instanceof byte[]) {
            return new String((byte[]) payload);
        } 
        else if (payload instanceof char[]) {
            return new String((char[]) payload);
        } 
        else { 
            return payload.toString();
        } 
    }

    @Transformer(inputChannel="iSOConverterChannel", outputChannel="toBSChannel")
    public String iSOConverter(byte[] payload) throws Exception {
        System.out.println("ISO Conversion place");
        if (payload instanceof byte[]) {
            return new String((byte[]) payload);
        } 
        else { 
            return payload.toString();
        } 
    }

}

和xml配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    ..............................
    ............................">
    <description>Inbound Connectors common configuration file.
    </description>
    <int:annotation-config />
    <context:component-scan base-package="com.client.connector.inbound" />
</beans>

然后我有另一个在启动时未扫描的转换器。

package com.client.inboundtest.newclass;

@MessageEndpoint
public class DinamicAddedConverter {

    @Transformer(inputChannel="iSOConverterChannel", outputChannel="toBSChannel")
    public String iSOConverter2(Object payload) throws Exception {
        System.out.println("ISO conversion from new class");
        if (payload instanceof byte[]) {
            return new String((byte[]) payload);
        } 
        else if (payload instanceof char[]) {
            return new String((char[]) payload);
        } 
        else { 
            return payload.toString();
        } 
    }

    @Transformer(inputChannel="iSOConverterChannel", outputChannel="toBSChannel")
    public String iSOConverter2(byte[] payload) throws Exception {
        System.out.println("ISO conversion from new class");
        if (payload instanceof byte[]) {
            return new String((byte[]) payload);
        } 
        else { 
            return payload.toString();
        } 
    }

}

当我启动程序，并使用telnet连接到端口9877，并设置单词test时，我在java app的输出中得到了这个

ISO Conversion place
Bussines logic: test
ISO Conversion place
Bussines logic: test

如果我在java控制台中编写com.client.inboundtest.newclass包，它会加载新的转换器，并显示日志

com.client.inboundtest.newclass
Added class com.client.inboundtest.newclass.DinamicAddedConverter
Nov 11, 2015 7:41:51 PM org.springframework.integration.endpoint.EventDrivenConsumer logComponentSubscriptionEvent
INFO: Adding {transformer:com.client.inboundtest.newclass.DinamicAddedConverter.iSOConverter2.transformer} as a subscriber to the 'iSOConverterChannel' channel
Nov 11, 2015 7:41:51 PM org.springframework.integration.channel.AbstractSubscribableChannel adjustCounterIfNecessary
INFO: Channel 'org.springframework.context.support.GenericXmlApplicationContext@4d9cad9d.iSOConverterChannel' has 3 subscriber(s).
Nov 11, 2015 7:41:51 PM org.springframework.integration.endpoint.AbstractEndpoint start
INFO: started com.client.inboundtest.newclass.DinamicAddedConverter.iSOConverter2.transformer
Nov 11, 2015 7:41:51 PM org.springframework.integration.endpoint.EventDrivenConsumer logComponentSubscriptionEvent
INFO: Adding {transformer} as a subscriber to the 'iSOConverterChannel' channel
Nov 11, 2015 7:41:51 PM org.springframework.integration.channel.AbstractSubscribableChannel adjustCounterIfNecessary
INFO: Channel 'org.springframework.context.support.GenericXmlApplicationContext@4d9cad9d.iSOConverterChannel' has 4 subscriber(s).
Nov 11, 2015 7:41:51 PM org.springframework.integration.endpoint.AbstractEndpoint start
INFO: started com.client.inboundtest.newclass.DinamicAddedConverter.iSOConverter2.transformer#2

并向同一个打开的telnet连接发送新消息，在java app console

上提供此输出

ISO Conversion place
Bussines logic: test2
ISO Conversion place
Bussines logic: test2
ISO conversion from new class
Bussines logic: test2
ISO conversion from new class
Bussines logic: test2

这是我的期望。

然后我尝试将我的POC移动到Spring MVC上下文中我开始看到意外的行为，第一个非预期的事情是通道不是动态创建的，因为它发生在第一个POC中，所以我需要定义它们在像

这样的上下文文件中是显式的

<beans ........">
    <context:component-scan base-package="main.package" />

    <int:annotation-config />

    <int:channel id="toBSChannel" />
    <int:channel id="iSOConverterChannel" />
    <int:channel id="restRequestChannel" />

    <bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix">
            <value>/WEB-INF/views/</value>
        </property>
        <property name="suffix">
            <value>.jsp</value>
        </property>
    </bean>
</beans>

我所做的是创建一个连接到我的原始DynamicApplication的新控制器，并在启动监听器的bean子上通过@PostConstruct将静态调用更改为setup。

当应用程序启动时，它会在端口9877上显示我的serlvlets和我的监听器，当我调用刷新servlet时，它显示的是我从java应用程序获得的完全相同的输出：

Added class com.client.inboundtest.newclass.ConverterA
Nov 11, 2015 7:55:59 PM org.springframework.integration.endpoint.EventDrivenConsumer logComponentSubscriptionEvent
INFO: Adding {transformer:com.client.inboundtest.newclass.ConverterA.iSOConverter.transformer} as a subscriber to the 'iSOConverterChannel' channel
Nov 11, 2015 7:55:59 PM org.springframework.integration.channel.AbstractSubscribableChannel adjustCounterIfNecessary
INFO: Channel 'org.springframework.web.context.WebApplicationContext:/InboundDinamicGC/dispatcher.iSOConverterChannel' has 7 subscriber(s).
Nov 11, 2015 7:55:59 PM org.springframework.integration.endpoint.AbstractEndpoint start
INFO: started com.client.inboundtest.newclass.ConverterA.iSOConverter.transformer
Nov 11, 2015 7:55:59 PM org.springframework.integration.endpoint.EventDrivenConsumer logComponentSubscriptionEvent
INFO: Adding {transformer} as a subscriber to the 'iSOConverterChannel' channel
Nov 11, 2015 7:55:59 PM org.springframework.integration.channel.AbstractSubscribableChannel adjustCounterIfNecessary
INFO: Channel 'org.springframework.web.context.WebApplicationContext:/InboundDinamicGC/dispatcher.iSOConverterChannel' has 8 subscriber(s).
Nov 11, 2015 7:55:59 PM org.springframework.integration.endpoint.AbstractEndpoint start
INFO: started com.client.inboundtest.newclass.ConverterA.iSOConverter.transformer#2

问题是消息永远不会到达新的转换器，因为它发生在普通的Java POC上，任何想法？

Answer 1

请查看类似问题How to hook up a list of message driven adapters without actually writing each one out?及其讨论，以及其中的链接。

您应该做的只是创建一个child应用程序上下文。就像你在setupContext()中所做的一样，但当然要推动那个MVC parent和refresh()。

动态加载Spring Integration组件

1 个答案: