How to do channel interceptor based on pattern using JAVA DSL in Spring Integration? - spring-integration

Question

We are planning to migrate our code from Spring integration XML to DSL. In XML Version, we are using channel name pattern to do tracing.
For Eg: If channel name has *_EL_*, we intercept the channel and do some logging.
How to do this kind or more simpler in Java dsl.

Answer 1

The #GlobalChannelInterceptor is for you. And it is a part of Spring Integration Core.
So, you must do something like this:
#Bean
public MessageChannel bar() {
return new DirectChannel();
}
#Bean
#GlobalChannelInterceptor(patterns = "*_EL_*")
public WireTap baz() {
return new WireTap(this.bar());
}
I mean specify the ChannelInterceptor #Bean and mark it with that annotation to make pattern-based interceptions.
UPDATE
The sample test-case which demonstrate the work for #GlobalChannelInterceptor for the auto-created channel from DSL flows:
#ContextConfiguration
#RunWith(SpringJUnit4ClassRunner.class)
#DirtiesContext
public class SO31573744Tests {
#Autowired
private TestGateway testGateway;
#Autowired
private PollableChannel intercepted;
#Test
public void testIt() {
this.testGateway.testIt("foo");
Message<?> receive = this.intercepted.receive(1000);
assertNotNull(receive);
assertEquals("foo", receive.getPayload());
}
#MessagingGateway
public interface TestGateway {
#Gateway(requestChannel = "testChannel")
void testIt(String payload);
}
#Configuration
#EnableIntegration
#IntegrationComponentScan
public static class ContextConfiguration {
#Bean
public IntegrationFlow testFlow() {
return IntegrationFlows.from("testChannel")
.channel("nullChannel")
.get();
}
#Bean
public PollableChannel intercepted() {
return new QueueChannel();
}
#Bean
#GlobalChannelInterceptor(patterns = "*Ch*")
public WireTap wireTap() {
return new WireTap(intercepted());
}
}
}