Polishing

spring-context/src/main/java/org/springframework/context/support/AbstractApplicationContext.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -478,7 +478,6 @@ public abstract class AbstractApplicationContext extends DefaultResourceLoader
 		this.beanFactoryPostProcessors.add(postProcessor);
 	}
 
-
 	/**
 	 * Return the list of BeanFactoryPostProcessors that will get applied
 	 * to the internal BeanFactory.
@@ -575,6 +574,7 @@ public abstract class AbstractApplicationContext extends DefaultResourceLoader
 	 * active flag as well as performing any initialization of property sources.
 	 */
 	protected void prepareRefresh() {
+		// Switch to active.
 		this.startupDate = System.currentTimeMillis();
 		this.closed.set(false);
 		this.active.set(true);
@@ -583,10 +583,10 @@ public abstract class AbstractApplicationContext extends DefaultResourceLoader
 			logger.info("Refreshing " + this);
 		}
 
-		// Initialize any placeholder property sources in the context environment
+		// Initialize any placeholder property sources in the context environment.
 		initPropertySources();
 
-		// Validate that all properties marked as required are resolvable
+		// Validate that all properties marked as required are resolvable:
 		// see ConfigurablePropertyResolver#setRequiredProperties
 		getEnvironment().validateRequiredProperties();
 
@@ -979,6 +979,7 @@ public abstract class AbstractApplicationContext extends DefaultResourceLoader
 	 * @see #registerShutdownHook()
 	 */
 	protected void doClose() {
+		// Check whether an actual close attempt is necessary...
 		if (this.active.get() && this.closed.compareAndSet(false, true)) {
 			if (logger.isInfoEnabled()) {
 				logger.info("Closing " + this);
@@ -1013,6 +1014,7 @@ public abstract class AbstractApplicationContext extends DefaultResourceLoader
 			// Let subclasses do some final clean-up if they wish...
 			onClose();
 
+			// Switch to inactive.
 			this.active.set(false);
 		}
 	}