Clean up shutdown hooks on refresh

Fixes gh-63

spring-cloud-context/src/test/java/org/springframework/cloud/bootstrap/config/RefreshEndpointTests.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright 2015 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.cloud.bootstrap.config;
+
+import static org.junit.Assert.assertEquals;
+
+import java.lang.reflect.Field;
+import java.util.Map;
+
+import org.junit.Test;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.cloud.context.scope.refresh.RefreshScope;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.util.ClassUtils;
+import org.springframework.util.ReflectionUtils;
+
+/**
+ * @author Dave Syer
+ *
+ */
+public class RefreshEndpointTests {
+
+	@Test
+	public void shutdownHooksCleaned() {
+		ConfigurableApplicationContext context = new SpringApplicationBuilder(Empty.class)
+				.web(false).showBanner(false).run();
+		RefreshScope scope = new RefreshScope();
+		scope.setApplicationContext(context);
+		RefreshEndpoint endpoint = new RefreshEndpoint(context, scope);
+		int count = countShutdownHooks();
+		endpoint.invoke();
+		int after = countShutdownHooks();
+		assertEquals("Shutdown hooks not cleaned on refresh", count, after);
+	}
+
+	private int countShutdownHooks() {
+		Class<?> type = ClassUtils.resolveClassName("java.lang.ApplicationShutdownHooks",
+				null);
+		Field field = ReflectionUtils.findField(type, "hooks");
+		ReflectionUtils.makeAccessible(field);
+		@SuppressWarnings("rawtypes")
+		Map map = (Map) ReflectionUtils.getField(field, null);
+		return map.size();
+	}
+
+	@Configuration
+	protected static class Empty {
+
+	}
+}