58 lines
2.3 KiB
Java
58 lines
2.3 KiB
Java
package example;
|
|
|
|
import java.util.Locale;
|
|
import java.util.function.Function;
|
|
|
|
import org.springframework.boot.SpringApplication;
|
|
import org.springframework.boot.autoconfigure.SpringBootApplication;
|
|
import org.springframework.cloud.function.context.FunctionRegistration;
|
|
import org.springframework.cloud.function.context.MessageRoutingCallback;
|
|
import org.springframework.cloud.function.context.catalog.FunctionTypeUtils;
|
|
import org.springframework.context.ApplicationContextInitializer;
|
|
import org.springframework.context.support.GenericApplicationContext;
|
|
import org.springframework.messaging.Message;
|
|
|
|
@SpringBootApplication
|
|
public class FunctionConfiguration implements ApplicationContextInitializer<GenericApplicationContext> {
|
|
|
|
/*
|
|
* You need this main method or explicit <start-class>example.FunctionConfiguration</start-class>
|
|
* in the POM to ensure boot plug-in makes the correct entry
|
|
*/
|
|
public static void main(String[] args) {
|
|
SpringApplication.run(FunctionConfiguration.class, args);
|
|
}
|
|
|
|
public Function<String, String> uppercase() {
|
|
return value -> value.toUpperCase(Locale.ROOT);
|
|
}
|
|
|
|
public Function<String, String> reverse() {
|
|
return value -> new StringBuilder(value).reverse().toString();
|
|
}
|
|
|
|
public static class RoutingCallback implements MessageRoutingCallback {
|
|
@Override
|
|
public FunctionRoutingResult routingResult(Message<?> message) {
|
|
String payload = new String((byte[]) message.getPayload());
|
|
System.out.println("==> Will be routing based on payload: " + payload);
|
|
return payload.contains("uppercase")
|
|
? new FunctionRoutingResult("uppercase")
|
|
: new FunctionRoutingResult("reverse");
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public void initialize(GenericApplicationContext applicationContext) {
|
|
System.out.println("==> Initializing");
|
|
applicationContext.registerBean(MessageRoutingCallback.class,
|
|
() -> new RoutingCallback());
|
|
applicationContext.registerBean("uppercase", FunctionRegistration.class,
|
|
() -> new FunctionRegistration<>(uppercase()).type(
|
|
FunctionTypeUtils.functionType(String.class, String.class)));
|
|
applicationContext.registerBean("reverse", FunctionRegistration.class,
|
|
() -> new FunctionRegistration<>(reverse()).type(
|
|
FunctionTypeUtils.functionType(String.class, String.class)));
|
|
}
|
|
}
|