Use @EnableModule(Channels.class) instead of field declarations

Standard channel interface types of Sink, Source, Processor
are provided, but user can create others with @Input and
@Output MessageChannel methods.

To get the declared channels in an app you can use the
@ModuleChannels qualifier to inject the interface, e.g.
@ModuleChannels(Cafe.class) injects the channels defined
in the Cafe.

spring-cloud-stream-samples/tap/src/main/java/config/TappingLoggingSink.java

@@ -18,25 +18,20 @@ package config;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-
 import org.springframework.cloud.stream.annotation.EnableModule;
-import org.springframework.cloud.stream.annotation.Input;
+import org.springframework.cloud.stream.annotation.Sink;
 import org.springframework.integration.annotation.ServiceActivator;
-import org.springframework.messaging.MessageChannel;
 
 /**
  * @author Dave Syer
  * @author Marius Bogoevici
  */
-@EnableModule
+@EnableModule(Sink.class)
 public class TappingLoggingSink {
-	
+
 	private static Logger logger = LoggerFactory.getLogger(TappingLoggingSink.class);
 
-	@Input
-	public MessageChannel input;
-
-	@ServiceActivator(inputChannel="input")
+	@ServiceActivator(inputChannel = Sink.INPUT)
 	public void loggerSink(Object payload) {
 		logger.info("Received: " + payload);
 	}

spring-cloud-stream-samples/tap/src/main/java/demo/TapApplication.java

@@ -2,13 +2,11 @@ package demo;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.cloud.stream.annotation.EnableModule;
 import org.springframework.context.annotation.ComponentScan;
 
 import config.TappingLoggingSink;
 
 @SpringBootApplication
-@EnableModule
 @ComponentScan(basePackageClasses= TappingLoggingSink.class)
 public class TapApplication {