I need to be able to add converters to a running Spring integration application context managed by an MVC application, in order to achieve that, I started by a simple POC where I load a new converter on runtime (this converter wasn't scanned at startup), this POC runs as a standalone java app and only includes spring integration libraries, here is the main class.
@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;
}
}
a very simple service activator
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;
}
}
and also a initial converter package 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();
}
}
}
and the xml config file
<?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>
And then I have another converter which wasn't scanned at startup.
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();
}
}
}
When I start the program, and connect to port 9877 using telnet, and set the word test, I got this in the output of the java app
ISO Conversion place
Bussines logic: test
ISO Conversion place
Bussines logic: test
The, if I write the package com.client.inboundtest.newclass in the java console, it load the new converter, and shows the log
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
and sending a new message to the same opened telnet connection gives this output on the java app console
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
Which is what I expect.
Then I tried to move my POC to a Spring MVC context I started seeing unexpected behaviors, the first non-expected thing was that the channels wasn't dynamically created as it was happening in the first POC, so I need to define them explicit on the context file like this
<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>
What I did was to create a new controller wired to my original DynamicApplication and change the static call to setup by a @PostConstruct on the bean son the listeners are started.
When the app starts, it shows my serlvlets along with my listener on port 9877, and when I call the refresh servlet, it is showing the exact same output I got from the java app:
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
The problem is that the message never reaches the new converter as it happened on the plain java POC, any ideas?
