A RecipientListRouter sends each received message to a statically defined list of message channels.
One of the advantage of ‘RecipientListRouter’, you can attach an expression to filter the data.
Example
String expr1 = "payload.contains(\"secret\")";
router.addRecipient("secretChannel", expr1);
Router send the message to secretChannel, if the expr1 evaluates to true.
Find the below working application.
Step 1: Create new maven project ‘recepient-list-router-demo’.
Step 2: Update pom.xml with maven dependencies.
pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.sample.app</groupId>
<artifactId>recepient-list-router-demo</artifactId>
<version>1</version>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-parent -->
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.4.0</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-integration</artifactId>
</dependency>
</dependencies>
</project>
Step 3: Define gateway.
CustomGateway.java
package com.sample.app.gateway;
import org.springframework.integration.annotation.Gateway;
import org.springframework.integration.annotation.MessagingGateway;
import org.springframework.messaging.Message;
@MessagingGateway(name = "myGateway", defaultRequestChannel = "recipientRouter")
public interface CustomGateway {
@Gateway(requestChannel = "recipientRouter")
public void print(Message<?> message);
}
Step 4: Define consumer endpoint.
ConsumerEndpoint.java
package com.sample.app.endpoints;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.messaging.Message;
import org.springframework.stereotype.Component;
@Component
public class ConsumerEndpoint {
@ServiceActivator(inputChannel = "secretChannel")
public void consumeStringMessage(Message<String> message) {
System.out.println("Received message from secretChannel : " + message.getPayload());
}
@ServiceActivator(inputChannel = "publicChannel")
public void consumeIntegerMessage(Message<String> message) {
System.out.println("Received message from publicChannel : " + message.getPayload());
}
@ServiceActivator(inputChannel = "defaultOutputChannel")
public void defaultOutputChannelMsg(Message<String> message) {
System.out.println("Received message from defaultOutputChannel : " + message.getPayload());
}
}
Step 5: Define main application class.
App.java
package com.sample.app;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.integration.router.RecipientListRouter;
import org.springframework.integration.support.MessageBuilder;
import org.springframework.messaging.Message;
import com.sample.app.gateway.CustomGateway;
@SpringBootApplication
@Configuration
public class App {
@ServiceActivator(inputChannel = "recipientRouter")
@Bean
public RecipientListRouter router() {
RecipientListRouter router = new RecipientListRouter();
router.setSendTimeout(1_234L);
router.setIgnoreSendFailures(true);
router.setApplySequence(true);
router.setDefaultOutputChannelName("defaultOutputChannel");
String expr1 = "payload.contains(\"secret\")";
router.addRecipient("secretChannel", expr1);
String expr2 = "payload.contains(\"public\")";
router.addRecipient("publicChannel", expr2);
return router;
}
@Autowired
private CustomGateway customGateway;
public static void main(String[] args) {
SpringApplication.run(App.class, args);
}
@Bean
public CommandLineRunner demo() {
return (args) -> {
for (int i = 0; i < 10; i++) {
Message<?> message = null;
if (i % 2 == 0) {
message = MessageBuilder.withPayload("secret message " + i).setHeader("messageType", "secret")
.build();
} else if (i % 3 == 0) {
message = MessageBuilder.withPayload("public message " + i).setHeader("messageType", "public")
.build();
} else {
message = MessageBuilder.withPayload("Generic message " + i).setHeader("messageType", "public")
.build();
}
customGateway.print(message);
}
};
}
}
Total project structure looks like below.
Run App.java, you will see below messages in console.
Received message from secretChannel : secret message 0 Received message from defaultOutputChannel : Generic message 1 Received message from secretChannel : secret message 2 Received message from publicChannel : public message 3 Received message from secretChannel : secret message 4 Received message from defaultOutputChannel : Generic message 5 Received message from secretChannel : secret message 6 Received message from defaultOutputChannel : Generic message 7 Received message from secretChannel : secret message 8 Received message from publicChannel : public message 9
You can download complete working application below link.
https://github.com/harikrishna553/springboot/tree/master/spring-integration/recepient-list-router-demo
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