publish eureka instance events

spring-platform-netflix-core/src/main/java/org/springframework/platform/netflix/eureka/EurekaServerAutoConfiguration.java

@@ -18,14 +18,24 @@ package org.springframework.platform.netflix.eureka;
 import javax.servlet.ServletContext;
 import javax.servlet.ServletContextEvent;
 
+import com.netflix.eureka.PeerAwareInstanceRegistry;
+import com.netflix.eureka.lease.LeaseManager;
+import org.springframework.aop.framework.ProxyFactory;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.ApplicationContext;
+import org.springframework.context.ApplicationListener;
 import org.springframework.context.SmartLifecycle;
+import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.Ordered;
+import org.springframework.platform.netflix.eureka.advice.PiggybackMethodInterceptor;
+import org.springframework.platform.netflix.eureka.event.EurekaRegistryAvailableEvent;
+import org.springframework.platform.netflix.eureka.event.EurekaServerStartedEvent;
+import org.springframework.platform.netflix.eureka.event.LeaseManagerMessageBroker;
+import org.springframework.util.ReflectionUtils;
 import org.springframework.web.context.ServletContextAware;
 
 import com.netflix.blitz4j.LoggingConfiguration;
@@ -33,6 +43,9 @@ import com.netflix.eureka.EurekaBootStrap;
 import com.netflix.eureka.EurekaServerConfig;
 import com.netflix.eureka.EurekaServerConfigurationManager;
 
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+
 /**
  * @author Dave Syer
  *
@@ -113,4 +126,41 @@ public class EurekaServerAutoConfiguration implements ServletContextAware,
 		return order;
 	}
 
+    @Configuration
+    @ConditionalOnClass(PeerAwareInstanceRegistry.class)
+    protected static class Initializer implements
+            ApplicationListener<EurekaRegistryAvailableEvent> {
+
+        @Autowired
+        private ApplicationContext applicationContext;
+
+        @Bean
+        public LeaseManagerMessageBroker leaseManagerMessageBroker() {
+            return new LeaseManagerMessageBroker();
+        }
+
+        @Override
+        public void onApplicationEvent(EurekaRegistryAvailableEvent event) {
+            //wrap the instance registry...
+            ProxyFactory factory = new ProxyFactory(PeerAwareInstanceRegistry.getInstance());
+            //...with the LeaseManagerMessageBroker
+            factory.addAdvice(new PiggybackMethodInterceptor(leaseManagerMessageBroker(), LeaseManager.class));
+            factory.setProxyTargetClass(true);
+
+            //Now replace the PeerAwareInstanceRegistry with our wrapped version
+            Field field = ReflectionUtils.findField(PeerAwareInstanceRegistry.class, "instance");
+            try {
+                // Awful ugly hack to work around lack of DI in eureka
+                field.setAccessible(true);
+                Field modifiersField = Field.class.getDeclaredField("modifiers");
+                modifiersField.setAccessible(true);
+                modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);
+                ReflectionUtils.setField(field, null, factory.getProxy());
+            }
+            catch (Exception e) {
+                throw new IllegalStateException("Cannot modify instance registry", e);
+            }
+        }
+
+    }
 }

spring-platform-netflix-core/src/main/java/org/springframework/platform/netflix/eureka/advice/LeaseManagerLite.java

@@ -1,28 +0,0 @@
-/*
- * Copyright 2013-2014 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.springframework.platform.netflix.eureka.advice;
-
-import com.netflix.appinfo.InstanceInfo;
-
-/**
- * @author Dave Syer
- *
- */
-public interface LeaseManagerLite {
-
-	void register(final InstanceInfo info, final boolean isReplication);
-
-}

spring-platform-netflix-core/src/main/java/org/springframework/platform/netflix/eureka/event/EurekaInstanceCanceledEvent.java

@@ -0,0 +1,21 @@
+package org.springframework.platform.netflix.eureka.event;
+
+import lombok.Data;
+import org.springframework.context.ApplicationEvent;
+
+/**
+ * @author Spencer Gibb
+ */
+@Data
+public class EurekaInstanceCanceledEvent extends ApplicationEvent {
+    private String appName;
+    private String serverId;
+    boolean replication;
+
+    public EurekaInstanceCanceledEvent(Object source, String appName, String serverId, boolean replication) {
+        super(source);
+        this.appName = appName;
+        this.serverId = serverId;
+        this.replication = replication;
+    }
+}

spring-platform-netflix-core/src/main/java/org/springframework/platform/netflix/eureka/event/EurekaInstanceRegisteredEvent.java

@@ -0,0 +1,23 @@
+package org.springframework.platform.netflix.eureka.event;
+
+import lombok.Data;
+import org.springframework.context.ApplicationEvent;
+
+/**
+ * @author Spencer Gibb
+ */
+@Data
+public class EurekaInstanceRegisteredEvent extends ApplicationEvent {
+    private String appName;
+    private String vip;
+    private int leaseDuration;
+    boolean replication;
+
+    public EurekaInstanceRegisteredEvent(Object source, String appName, String vip, int leaseDuration, boolean replication) {
+        super(source);
+        this.appName = appName;
+        this.vip = vip;
+        this.leaseDuration = leaseDuration;
+        this.replication = replication;
+    }
+}

spring-platform-netflix-core/src/main/java/org/springframework/platform/netflix/eureka/event/EurekaInstanceRenewedEvent.java

@@ -0,0 +1,21 @@
+package org.springframework.platform.netflix.eureka.event;
+
+import lombok.Data;
+import org.springframework.context.ApplicationEvent;
+
+/**
+ * @author Spencer Gibb
+ */
+@Data
+public class EurekaInstanceRenewedEvent extends ApplicationEvent {
+    private String appName;
+    private String serverId;
+    boolean replication;
+
+    public EurekaInstanceRenewedEvent(Object source, String appName, String serverId, boolean replication) {
+        super(source);
+        this.appName = appName;
+        this.serverId = serverId;
+        this.replication = replication;
+    }
+}

spring-platform-netflix-core/src/main/java/org/springframework/platform/netflix/eureka/event/EurekaRegistryAvailableEvent.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.platform.netflix.eureka;
+package org.springframework.platform.netflix.eureka.event;
 
 import org.springframework.context.ApplicationEvent;
 

spring-platform-netflix-core/src/main/java/org/springframework/platform/netflix/eureka/event/EurekaServerStartedEvent.java

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.platform.netflix.eureka;
+package org.springframework.platform.netflix.eureka.event;
 
 import org.springframework.context.ApplicationEvent;
 

spring-platform-netflix-core/src/main/java/org/springframework/platform/netflix/eureka/event/LeaseManagerMessageBroker.java

@@ -0,0 +1,44 @@
+package org.springframework.platform.netflix.eureka.event;
+
+import com.netflix.appinfo.InstanceInfo;
+import com.netflix.eureka.lease.LeaseManager;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.ApplicationContext;
+
+/**
+ * @author Spencer Gibb
+ */
+public class LeaseManagerMessageBroker implements LeaseManager<InstanceInfo> {
+    private static final Logger logger = LoggerFactory.getLogger(LeaseManagerMessageBroker.class);
+
+    @Autowired
+    private ApplicationContext ctxt;
+
+    @Override
+    public void register(InstanceInfo info, int leaseDuration, boolean isReplication) {
+        logger.debug("register {}, vip {}, leaseDuration {}, isReplication {}",
+                info.getAppName(), info.getVIPAddress(), leaseDuration, isReplication);
+        //TODO: what to publish from info (whole object?)
+        ctxt.publishEvent(new EurekaInstanceRegisteredEvent(this, info.getAppName(),
+                info.getVIPAddress(), leaseDuration, isReplication));
+    }
+
+    @Override
+    public boolean cancel(String appName, String serverId, boolean isReplication) {
+        logger.debug("cancel {}, serverId {}, isReplication {}", appName, serverId, isReplication);
+        ctxt.publishEvent(new EurekaInstanceCanceledEvent(this, appName, serverId, isReplication));
+        return false;
+    }
+
+    @Override
+    public boolean renew(String appName, String serverId, boolean isReplication) {
+        logger.debug("renew {}, serverId {}, isReplication {}", appName, serverId, isReplication);
+        ctxt.publishEvent(new EurekaInstanceRenewedEvent(this, appName, serverId, isReplication));
+        return false;
+    }
+
+    @Override
+    public void evict() {}
+}