Merge pull request #9755 from carloscaverobarca/BAEL-3217-Leadership-Election-with-Spring-Cloud-Consul

BAEL-3217 Leadership Election with Consul

spring-cloud/spring-cloud-consul/pom.xml

@@ -12,6 +12,13 @@
         <artifactId>spring-cloud</artifactId>
         <version>1.0.0-SNAPSHOT</version>
     </parent>
+    
+    <repositories>
+        <repository>
+            <id>jitpack.io</id>
+            <url>https://jitpack.io</url>
+        </repository>
+    </repositories>
 
     <dependencies>
         <dependency>
@@ -25,18 +32,32 @@
             <artifactId>spring-cloud-starter-consul-config</artifactId>
             <version>${spring-cloud-starter-consul.version}</version>
         </dependency>
-
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
-            <version>${spring-boot-starter-test.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>com.github.kinguinltdhk</groupId>
+            <artifactId>leadership-consul</artifactId>
+            <version>${kinguinltdhk.version}</version>
+              <exclusions>
+                <exclusion>
+                  <groupId>com.ecwid.consul</groupId> 
+                  <artifactId>consul-api</artifactId>
+                </exclusion>
+              </exclusions>
+        </dependency>
     </dependencies>
 
     <properties>
-        <spring-cloud-starter-consul.version>1.3.0.RELEASE</spring-cloud-starter-consul.version>
-        <spring-boot-starter-test.version>1.5.10.RELEASE</spring-boot-starter-test.version>
+        <spring-cloud-starter-consul.version>2.2.3.RELEASE</spring-cloud-starter-consul.version>
+        <kinguinltdhk.version>0.3.1</kinguinltdhk.version>
+        <start-class>com.baeldung.spring.cloud.consul.discovery.DiscoveryClientApplication</start-class>
     </properties>
 
 </project>

spring-cloud/spring-cloud-consul/src/main/java/com/baeldung/spring/cloud/consul/discovery/DiscoveryClientApplication.java

@@ -11,7 +11,7 @@ import static org.springframework.boot.WebApplicationType.NONE;
 public class DiscoveryClientApplication {
 
     public static void main(String[] args) {
-        new SpringApplicationBuilder(DiscoveryClientApplication.class).web(NONE)
+        new SpringApplicationBuilder(DiscoveryClientApplication.class)
             .run(args);
     }
 

spring-cloud/spring-cloud-consul/src/main/java/com/baeldung/spring/cloud/consul/leadership/LeadershipElection.java

@@ -0,0 +1,16 @@
+package com.baeldung.spring.cloud.consul.leadership;
+
+import java.util.concurrent.ExecutionException;
+
+import net.kinguin.leadership.consul.factory.SimpleConsulClusterFactory;
+
+public class LeadershipElection {
+    public static void main(String[] args) throws ExecutionException, InterruptedException {
+        new SimpleConsulClusterFactory()
+            .mode(SimpleConsulClusterFactory.MODE_MULTI)
+            .debug(true)
+            .build()
+            .asObservable()
+            .subscribe(i -> System.out.println(i));
+    }
+}

spring-cloud/spring-cloud-consul/src/main/resources/application.yml

@@ -11,4 +11,19 @@ spring:
         enabled: true
         instanceId: ${spring.application.name}:${random.value}
 server:
-  port: 0
+  port: 0
+
+cluster:
+  leader:
+    serviceName: cluster
+    serviceId: node-1
+    consul:
+      host: localhost
+      port: 8500
+      discovery:
+        enabled: false
+    session:
+      ttl: 15
+      refresh: 7
+    election:
+      envelopeTemplate: services/%s/leader