From f9fb23d472a4f9f5694358020e57472b30efd05a Mon Sep 17 00:00:00 2001
From: Dave Syer <dsyer@pivotal.io>
Date: Thu, 7 Aug 2014 11:32:19 -0700
Subject: [PATCH] Move piggy back stuff from cloudfoundry

---
 .../eureka/advice/LeaseManagerLite.java       | 28 ++++++++
 .../advice/PiggybackMethodInterceptor.java    | 64 +++++++++++++++++++
 2 files changed, 92 insertions(+)
 create mode 100644 spring-platform-netflix-core/src/main/java/org/springframework/platform/netflix/eureka/advice/LeaseManagerLite.java
 create mode 100644 spring-platform-netflix-core/src/main/java/org/springframework/platform/netflix/eureka/advice/PiggybackMethodInterceptor.java

diff --git a/spring-platform-netflix-core/src/main/java/org/springframework/platform/netflix/eureka/advice/LeaseManagerLite.java b/spring-platform-netflix-core/src/main/java/org/springframework/platform/netflix/eureka/advice/LeaseManagerLite.java
new file mode 100644
index 00000000..603319b3
--- /dev/null
+++ b/spring-platform-netflix-core/src/main/java/org/springframework/platform/netflix/eureka/advice/LeaseManagerLite.java
@@ -0,0 +1,28 @@
+/*
+ * 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);
+
+}
diff --git a/spring-platform-netflix-core/src/main/java/org/springframework/platform/netflix/eureka/advice/PiggybackMethodInterceptor.java b/spring-platform-netflix-core/src/main/java/org/springframework/platform/netflix/eureka/advice/PiggybackMethodInterceptor.java
new file mode 100644
index 00000000..239c6168
--- /dev/null
+++ b/spring-platform-netflix-core/src/main/java/org/springframework/platform/netflix/eureka/advice/PiggybackMethodInterceptor.java
@@ -0,0 +1,64 @@
+/*
+ * 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 java.lang.reflect.Method;
+
+import org.aopalliance.intercept.MethodInterceptor;
+import org.aopalliance.intercept.MethodInvocation;
+import org.springframework.util.ReflectionUtils;
+
+/**
+ * @author Dave Syer
+ *
+ */
+public class PiggybackMethodInterceptor implements MethodInterceptor {
+
+	private Object delegate;
+	private Class<?>[] types;
+
+	public PiggybackMethodInterceptor(Object delegate, Class<?>... types) {
+		this.delegate = delegate;
+		this.types = types;
+	}
+
+	@Override
+	public Object invoke(MethodInvocation invocation) throws Throwable {
+		Object result = invocation.proceed();
+		invokeAfter(invocation.getMethod(), invocation.getArguments());
+		return result;
+	}
+
+	private void invokeAfter(Method method, Object[] arguments) throws Exception {
+		for (Class<?> type : types) {
+			Method target = getTarget(type, method);
+			if (target != null) {
+				target.invoke(delegate, arguments);
+				return;
+			}
+		}
+	}
+
+	private Method getTarget(Class<?> type, Method method) {
+		Method target = ReflectionUtils.findMethod(type, method.getName(),
+				method.getParameterTypes());
+		if (target != null) {
+			return target;
+		}
+		return null;
+	}
+
+}