Using SmartLifecycle to register MBeans

Prior to this commit, MBeans were registered in a post construct
call of MBeanExporter. This commit moves that logic after the
initialization phase using the SmartLifecycle callback.

Issue: SPR-8045

spring-context/src/main/java/org/springframework/jmx/export/MBeanExporter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2014 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.
@@ -51,6 +51,7 @@ import org.springframework.beans.factory.InitializingBean;
 import org.springframework.beans.factory.ListableBeanFactory;
 import org.springframework.beans.factory.config.ConfigurableBeanFactory;
 import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
+import org.springframework.context.SmartLifecycle;
 import org.springframework.core.Constants;
 import org.springframework.jmx.export.assembler.AutodetectCapableMBeanInfoAssembler;
 import org.springframework.jmx.export.assembler.MBeanInfoAssembler;
@@ -67,6 +68,7 @@ import org.springframework.util.ClassUtils;
 import org.springframework.util.CollectionUtils;
 import org.springframework.util.ObjectUtils;
 
+
 /**
  * JMX exporter that allows for exposing any <i>Spring-managed bean</i> to a
  * JMX {@link javax.management.MBeanServer}, without the need to define any
@@ -98,7 +100,7 @@ import org.springframework.util.ObjectUtils;
  * @see MBeanExporterListener
  */
 public class MBeanExporter extends MBeanRegistrationSupport
-		implements MBeanExportOperations, BeanClassLoaderAware, BeanFactoryAware, InitializingBean, DisposableBean {
+		implements MBeanExportOperations, BeanClassLoaderAware, BeanFactoryAware, InitializingBean, DisposableBean, SmartLifecycle {
 
 	/**
 	 * Autodetection mode indicating that no autodetection should be used.
@@ -178,6 +180,14 @@ public class MBeanExporter extends MBeanRegistrationSupport
 	/** Stores the BeanFactory for use in autodetection process */
 	private ListableBeanFactory beanFactory;
 
+	private boolean autoStartup = true;
+
+	private volatile boolean running = false;
+
+	private int phase = Integer.MAX_VALUE;
+
+	private final Object lifecycleMonitor = new Object();
+
 
 	/**
 	 * Supply a {@code Map} of beans to be registered with the JMX
@@ -412,17 +422,6 @@ public class MBeanExporter extends MBeanRegistrationSupport
 		if (this.server == null) {
 			this.server = JmxUtils.locateMBeanServer();
 		}
-		try {
-			logger.info("Registering beans for JMX exposure on startup");
-			registerBeans();
-			registerNotificationListeners();
-		}
-		catch (RuntimeException ex) {
-			// Unregister beans already registered by this exporter.
-			unregisterNotificationListeners();
-			unregisterBeans();
-			throw ex;
-		}
 	}
 
 	/**
@@ -1054,6 +1053,78 @@ public class MBeanExporter extends MBeanRegistrationSupport
 		}
 	}
 
+	/**
+	 * Set whether to automatically start the container after initialization.
+	 * <p>Default is "true"; set this to "false" to allow for manual startup
+	 * through the {@link #start()} method.
+	 */
+	public void setAutoStartup(boolean autoStartup) {
+		this.autoStartup = autoStartup;
+	}
+
+	@Override
+	public boolean isAutoStartup() {
+		return this.autoStartup;
+	}
+
+	@Override
+	public void stop(Runnable callback) {
+		synchronized (this.lifecycleMonitor) {
+			stop();
+			callback.run();
+		}
+	}
+
+	@Override
+	public void start() {
+		logger.info("Registering beans for JMX exposure");
+		synchronized (this.lifecycleMonitor) {
+			try {
+				registerBeans();
+				registerNotificationListeners();
+			} catch (RuntimeException ex) {
+				// Unregister beans already registered by this exporter.
+				unregisterNotificationListeners();
+				unregisterBeans();
+				throw ex;
+			}
+		}
+		running = true;
+	}
+
+	@Override
+	public void stop() {
+		logger.info("Unregistering JMX-exposed beans on stop");
+		synchronized (this.lifecycleMonitor) {
+			unregisterNotificationListeners();
+			unregisterBeans();
+			running = false;
+		}
+	}
+
+	@Override
+	public boolean isRunning() {
+		synchronized (this.lifecycleMonitor) {
+			return this.running;
+		}
+	}
+
+	/**
+	 * Specify the phase in which this container should be started and
+	 * stopped. The startup order proceeds from lowest to highest, and
+	 * the shutdown order is the reverse of that. By default this value
+	 * is Integer.MAX_VALUE meaning that this container starts as late
+	 * as possible and stops as soon as possible.
+	 */
+	public void setPhase(int phase) {
+		this.phase = phase;
+	}
+
+	@Override
+	public int getPhase() {
+		return this.phase;
+	}
+
 
 	//---------------------------------------------------------------------
 	// Inner classes for internal use

spring-context/src/test/java/org/springframework/jmx/export/MBeanExporterTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2013 the original author or authors.
+ * Copyright 2002-2014 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.
@@ -38,6 +38,7 @@ import org.springframework.aop.framework.ProxyFactory;
 import org.springframework.beans.factory.support.BeanDefinitionBuilder;
 import org.springframework.beans.factory.support.DefaultListableBeanFactory;
 import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
+import org.springframework.context.support.GenericApplicationContext;
 import org.springframework.core.io.ClassPathResource;
 import org.springframework.jmx.AbstractMBeanServerTests;
 import org.springframework.jmx.IJmxTestBean;
@@ -116,6 +117,7 @@ public final class MBeanExporterTests extends AbstractMBeanServerTests {
 		exporter.setNotificationListenerMappings(listeners);
 		try {
 			exporter.afterPropertiesSet();
+			exporter.start();
 			fail("Must have thrown an MBeanExportException when registering a NotificationListener on a non-existent MBean.");
 		}
 		catch (MBeanExportException expected) {
@@ -129,6 +131,7 @@ public final class MBeanExporterTests extends AbstractMBeanServerTests {
 		exporter.setBeans(getBeanMap());
 		exporter.setServer(server);
 		exporter.afterPropertiesSet();
+		exporter.start();
 		assertIsRegistered("The bean was not registered with the MBeanServer",
 				ObjectNameManager.getInstance(OBJECT_NAME));
 	}
@@ -156,6 +159,7 @@ public final class MBeanExporterTests extends AbstractMBeanServerTests {
 		exporter.setBeans(map);
 		exporter.setAssembler(asm);
 		exporter.afterPropertiesSet();
+		exporter.start();
 
 		Object name = server.getAttribute(ObjectNameManager.getInstance("spring:name=dynBean"), "Name");
 		assertEquals("The name attribute is incorrect", "Rob Harrop", name);
@@ -164,11 +168,12 @@ public final class MBeanExporterTests extends AbstractMBeanServerTests {
 
 	@Test
 	public void testAutodetectMBeans() throws Exception {
-		DefaultListableBeanFactory bf = new DefaultListableBeanFactory();
+		GenericApplicationContext ctx = new GenericApplicationContext();
-		new XmlBeanDefinitionReader(bf).loadBeanDefinitions(new ClassPathResource("autodetectMBeans.xml", getClass()));
+		new XmlBeanDefinitionReader(ctx).loadBeanDefinitions(new ClassPathResource("autodetectMBeans.xml", getClass()));
+		ctx.refresh();
 		try {
-			bf.getBean("exporter");
+			ctx.getBean("exporter");
-			MBeanServer server = (MBeanServer) bf.getBean("server");
+			MBeanServer server = (MBeanServer) ctx.getBean("server");
 			ObjectInstance instance = server.getObjectInstance(ObjectNameManager.getInstance("spring:mbean=true"));
 			assertNotNull(instance);
 			instance = server.getObjectInstance(ObjectNameManager.getInstance("spring:mbean2=true"));
@@ -176,17 +181,18 @@ public final class MBeanExporterTests extends AbstractMBeanServerTests {
 			instance = server.getObjectInstance(ObjectNameManager.getInstance("spring:mbean3=true"));
 			assertNotNull(instance);
 		} finally {
-			bf.destroySingletons();
+			ctx.destroy();
 		}
 	}
 
 	@Test
 	public void testAutodetectWithExclude() throws Exception {
-		DefaultListableBeanFactory bf = new DefaultListableBeanFactory();
+		GenericApplicationContext ctx = new GenericApplicationContext();
-		new XmlBeanDefinitionReader(bf).loadBeanDefinitions(new ClassPathResource("autodetectMBeans.xml", getClass()));
+		new XmlBeanDefinitionReader(ctx).loadBeanDefinitions(new ClassPathResource("autodetectMBeans.xml", getClass()));
+		ctx.refresh();
 		try {
-			bf.getBean("exporter");
+			ctx.getBean("exporter");
-			MBeanServer server = (MBeanServer) bf.getBean("server");
+			MBeanServer server = (MBeanServer) ctx.getBean("server");
 			ObjectInstance instance = server.getObjectInstance(ObjectNameManager.getInstance("spring:mbean=true"));
 			assertNotNull(instance);
 
@@ -196,17 +202,18 @@ public final class MBeanExporterTests extends AbstractMBeanServerTests {
 			} catch (InstanceNotFoundException expected) {
 			}
 		} finally {
-			bf.destroySingletons();
+			ctx.destroy();
 		}
 	}
 
 	@Test
 	public void testAutodetectLazyMBeans() throws Exception {
-		DefaultListableBeanFactory bf = new DefaultListableBeanFactory();
+		GenericApplicationContext ctx = new GenericApplicationContext();
-		new XmlBeanDefinitionReader(bf).loadBeanDefinitions(new ClassPathResource("autodetectLazyMBeans.xml", getClass()));
+		new XmlBeanDefinitionReader(ctx).loadBeanDefinitions(new ClassPathResource("autodetectLazyMBeans.xml", getClass()));
+		ctx.refresh();
 		try {
-			bf.getBean("exporter");
+			ctx.getBean("exporter");
-			MBeanServer server = (MBeanServer) bf.getBean("server");
+			MBeanServer server = (MBeanServer) ctx.getBean("server");
 
 			ObjectName oname = ObjectNameManager.getInstance("spring:mbean=true");
 			assertNotNull(server.getObjectInstance(oname));
@@ -218,18 +225,19 @@ public final class MBeanExporterTests extends AbstractMBeanServerTests {
 			name = (String) server.getAttribute(oname, "Name");
 			assertEquals("Invalid name returned", "Juergen Hoeller", name);
 		} finally {
-			bf.destroySingletons();
+			ctx.destroy();
 		}
 	}
 
 	@Test
 	public void testAutodetectNoMBeans() throws Exception {
-		DefaultListableBeanFactory bf = new DefaultListableBeanFactory();
+		GenericApplicationContext ctx = new GenericApplicationContext();
-		new XmlBeanDefinitionReader(bf).loadBeanDefinitions(new ClassPathResource("autodetectNoMBeans.xml", getClass()));
+		new XmlBeanDefinitionReader(ctx).loadBeanDefinitions(new ClassPathResource("autodetectNoMBeans.xml", getClass()));
+		ctx.refresh();
 		try {
-			bf.getBean("exporter");
+			ctx.getBean("exporter");
 		} finally {
-			bf.destroySingletons();
+			ctx.destroy();
 		}
 	}
 
@@ -243,6 +251,7 @@ public final class MBeanExporterTests extends AbstractMBeanServerTests {
 		exporter.setServer(server);
 		exporter.setListeners(new MBeanExporterListener[] { listener1, listener2 });
 		exporter.afterPropertiesSet();
+		exporter.start();
 		exporter.destroy();
 
 		assertListener(listener1);
@@ -289,6 +298,7 @@ public final class MBeanExporterTests extends AbstractMBeanServerTests {
 		exporter.setBeans(beans);
 
 		exporter.afterPropertiesSet();
+		exporter.start();
 
 		ObjectInstance instance = server.getObjectInstance(objectName);
 		assertNotNull(instance);
@@ -318,6 +328,7 @@ public final class MBeanExporterTests extends AbstractMBeanServerTests {
 		exporter.setRegistrationBehavior(MBeanExporter.REGISTRATION_IGNORE_EXISTING);
 
 		exporter.afterPropertiesSet();
+		exporter.start();
 
 		ObjectInstance instance = server.getObjectInstance(objectName);
 		assertNotNull(instance);
@@ -349,6 +360,7 @@ public final class MBeanExporterTests extends AbstractMBeanServerTests {
 		exporter.setRegistrationPolicy(RegistrationPolicy.REPLACE_EXISTING);
 
 		exporter.afterPropertiesSet();
+		exporter.start();
 
 		ObjectInstance instance = server.getObjectInstance(objectName);
 		assertNotNull(instance);
@@ -374,6 +386,7 @@ public final class MBeanExporterTests extends AbstractMBeanServerTests {
 		exporter.setBeans(beans);
 		exporter.setExposeManagedResourceClassLoader(true);
 		exporter.afterPropertiesSet();
+		exporter.start();
 
 		assertIsRegistered("Bean instance not registered", objectName);
 
@@ -404,6 +417,8 @@ public final class MBeanExporterTests extends AbstractMBeanServerTests {
 		exporter.setAutodetectMode(MBeanExporter.AUTODETECT_NONE);
 		// MBean has a bad ObjectName, so if said MBean is autodetected, an exception will be thrown...
 		exporter.afterPropertiesSet();
+		exporter.start();
+
 	}
 
 	@Test
@@ -420,6 +435,8 @@ public final class MBeanExporterTests extends AbstractMBeanServerTests {
 		exporter.setBeanFactory(factory);
 		exporter.setAutodetectMode(MBeanExporter.AUTODETECT_MBEAN);
 		exporter.afterPropertiesSet();
+		exporter.start();
+
 		assertIsRegistered("Bona fide MBean not autodetected in AUTODETECT_MBEAN mode",
 				ObjectNameManager.getInstance(OBJECT_NAME));
 		assertIsNotRegistered("Bean autodetected and (only) AUTODETECT_MBEAN mode is on",
@@ -442,6 +459,7 @@ public final class MBeanExporterTests extends AbstractMBeanServerTests {
 		exporter.setBeanFactory(factory);
 		exporter.setAutodetectMode(MBeanExporter.AUTODETECT_ALL);
 		exporter.afterPropertiesSet();
+		exporter.start();
 		assertIsRegistered("Bona fide MBean not autodetected in (AUTODETECT_ALL) mode",
 				ObjectNameManager.getInstance(OBJECT_NAME));
 		assertIsRegistered("Bean not autodetected in (AUTODETECT_ALL) mode",
@@ -464,6 +482,7 @@ public final class MBeanExporterTests extends AbstractMBeanServerTests {
 		exporter.setBeanFactory(factory);
 		exporter.setAutodetectMode(MBeanExporter.AUTODETECT_ASSEMBLER);
 		exporter.afterPropertiesSet();
+		exporter.start();
 		assertIsNotRegistered("Bona fide MBean was autodetected in AUTODETECT_ASSEMBLER mode - must not have been",
 				ObjectNameManager.getInstance(OBJECT_NAME));
 		assertIsRegistered("Bean not autodetected in AUTODETECT_ASSEMBLER mode",
@@ -488,6 +507,7 @@ public final class MBeanExporterTests extends AbstractMBeanServerTests {
 		exporter.setBeanFactory(factory);
 		exporter.setAutodetectMode(MBeanExporter.AUTODETECT_ASSEMBLER);
 		exporter.afterPropertiesSet();
+		exporter.start();
 		assertIsRegistered("Explicitly exported bona fide MBean obviously not exported.",
 				ObjectNameManager.getInstance(OBJECT_NAME));
 	}
@@ -566,6 +586,7 @@ public final class MBeanExporterTests extends AbstractMBeanServerTests {
 			beans.put(OBJECT_NAME, "beanName");
 			exporter.setBeans(beans);
 			exporter.afterPropertiesSet();
+			exporter.start();
 			fail("Expecting exception because MBeanExporter is not running in a BeanFactory and was passed bean name to (lookup and then) export");
 		}
 		catch (MBeanExportException expected) {
@@ -578,6 +599,7 @@ public final class MBeanExporterTests extends AbstractMBeanServerTests {
 			MBeanExporter exporter = new MBeanExporter();
 			exporter.setAutodetectMode(MBeanExporter.AUTODETECT_ALL);
 			exporter.afterPropertiesSet();
+			exporter.start();
 			fail("Expecting exception because MBeanExporter is not running in a BeanFactory and was configured to autodetect beans");
 		}
 		catch (MBeanExportException expected) {
@@ -595,6 +617,7 @@ public final class MBeanExporterTests extends AbstractMBeanServerTests {
 		MockMBeanExporterListener listener = new MockMBeanExporterListener();
 		exporter.setListeners(new MBeanExporterListener[] { listener });
 		exporter.afterPropertiesSet();
+		exporter.start();
 		assertIsRegistered("The bean was not registered with the MBeanServer",
 				ObjectNameManager.getInstance(OBJECT_NAME));
 
@@ -677,6 +700,7 @@ public final class MBeanExporterTests extends AbstractMBeanServerTests {
 
 		try {
 			exporter.afterPropertiesSet();
+			exporter.start();
 			fail("Must have failed during creation of RuntimeExceptionThrowingConstructorBean");
 		}
 		catch (RuntimeException expected) {