Add ApplicationContext to the EmbeddedServletContainerInitializedEvent

spring-boot/src/main/java/org/springframework/boot/context/embedded/EmbeddedServletContainerInitializedEvent.java

@@ -16,6 +16,7 @@
 
 package org.springframework.boot.context.embedded;
 
+import org.springframework.context.ApplicationContext;
 import org.springframework.context.ApplicationEvent;
 
 /**
@@ -28,13 +29,32 @@ import org.springframework.context.ApplicationEvent;
  */
 public class EmbeddedServletContainerInitializedEvent extends ApplicationEvent {
 
-	public EmbeddedServletContainerInitializedEvent(EmbeddedServletContainer source) {
+	private ApplicationContext applicationContext;
+
+	public EmbeddedServletContainerInitializedEvent(
+			ApplicationContext applicationContext, EmbeddedServletContainer source) {
 		super(source);
+		this.applicationContext = applicationContext;
 	}
 
+	/**
+	 * Access the source of the event (an {@link EmbeddedServletContainer}).
+	 * 
+	 * @return the embedded servlet container
+	 */
 	@Override
 	public EmbeddedServletContainer getSource() {
 		return (EmbeddedServletContainer) super.getSource();
 	}
 
+	/**
+	 * Access the application context that the container was created in. Sometimes it is
+	 * prudent to check that this matches expectations (like being equal to the current
+	 * context) before acting on the server container itself.
+	 * 
+	 * @return the applicationContext that the container was created from
+	 */
+	public ApplicationContext getApplicationContext() {
+		return this.applicationContext;
+	}
 }

spring-boot/src/main/java/org/springframework/boot/context/embedded/EmbeddedWebApplicationContext.java

@@ -147,7 +147,7 @@ public class EmbeddedWebApplicationContext extends GenericWebApplicationContext
 		super.finishRefresh();
 		startEmbeddedServletContainer();
 		if (this.embeddedServletContainer != null) {
-			publishEvent(new EmbeddedServletContainerInitializedEvent(
+			publishEvent(new EmbeddedServletContainerInitializedEvent(this,
 					this.embeddedServletContainer));
 		}
 	}

spring-boot/src/test/java/org/springframework/boot/context/embedded/EmbeddedWebApplicationContextTests.java

@@ -47,6 +47,7 @@ import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.instanceOf;
 import static org.hamcrest.Matchers.not;
 import static org.hamcrest.Matchers.nullValue;
+import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertThat;
 import static org.junit.Assert.assertTrue;
@@ -128,6 +129,7 @@ public class EmbeddedWebApplicationContextTests {
 				MockListener.class).getEvent();
 		assertNotNull(event);
 		assertTrue(event.getSource().getPort() >= 0);
+		assertEquals(this.context, event.getApplicationContext());
 	}
 
 	@Test