Support ApplicationReadyEvent from PidFileWriter

Update `ApplicationPidFileWriter` to support `ApplicationReadyEvent` in
addition to the already supported `ApplicationEnvironmentPreparedEvent`
and `ApplicationPreparedEvent` events.

Closes gh-7066
Fixes gh-7027

spring-boot/src/main/java/org/springframework/boot/system/ApplicationPidFileWriter.java

@@ -30,6 +30,7 @@ import org.springframework.boot.ApplicationPid;
 import org.springframework.boot.bind.RelaxedPropertyResolver;
 import org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent;
 import org.springframework.boot.context.event.ApplicationPreparedEvent;
+import org.springframework.boot.context.event.ApplicationReadyEvent;
 import org.springframework.boot.context.event.SpringApplicationEvent;
 import org.springframework.context.ApplicationListener;
 import org.springframework.core.Ordered;
@@ -49,7 +50,8 @@ import org.springframework.util.Assert;
  * <p>
  * Note: access to the Spring {@link Environment} is only possible when the
  * {@link #setTriggerEventType(Class) triggerEventType} is set to
- * {@link ApplicationEnvironmentPreparedEvent} or {@link ApplicationPreparedEvent}.
+ * {@link ApplicationEnvironmentPreparedEvent}, {@link ApplicationReadyEvent}, or
+ * {@link ApplicationPreparedEvent}.
  *
  * @author Jakub Kubrynski
  * @author Dave Syer
@@ -231,6 +233,10 @@ public class ApplicationPidFileWriter
 				return ((ApplicationPreparedEvent) event).getApplicationContext()
 						.getEnvironment();
 			}
+			if (event instanceof ApplicationReadyEvent) {
+				return ((ApplicationReadyEvent) event).getApplicationContext()
+						.getEnvironment();
+			}
 			return null;
 		}
 

spring-boot/src/test/java/org/springframework/boot/system/ApplicationPidFileWriterTests.java

@@ -29,6 +29,7 @@ import org.junit.rules.TemporaryFolder;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent;
 import org.springframework.boot.context.event.ApplicationPreparedEvent;
+import org.springframework.boot.context.event.ApplicationReadyEvent;
 import org.springframework.boot.context.event.ApplicationStartedEvent;
 import org.springframework.boot.context.event.SpringApplicationEvent;
 import org.springframework.context.ConfigurableApplicationContext;
@@ -99,7 +100,7 @@ public class ApplicationPidFileWriterTests {
 	}
 
 	@Test
-	public void differentEventTypes() throws Exception {
+	public void tryEnvironmentPreparedEvent() throws Exception {
 		File file = this.temporaryFolder.newFile();
 		SpringApplicationEvent event = createEnvironmentPreparedEvent("spring.pid.file",
 				file.getAbsolutePath());
@@ -111,6 +112,19 @@ public class ApplicationPidFileWriterTests {
 		assertThat(FileCopyUtils.copyToString(new FileReader(file))).isNotEmpty();
 	}
 
+	@Test
+	public void tryReadyEvent() throws Exception {
+		File file = this.temporaryFolder.newFile();
+		SpringApplicationEvent event = createReadyEvent("spring.pid.file",
+				file.getAbsolutePath());
+		ApplicationPidFileWriter listener = new ApplicationPidFileWriter();
+		listener.onApplicationEvent(event);
+		assertThat(FileCopyUtils.copyToString(new FileReader(file))).isEmpty();
+		listener.setTriggerEventType(ApplicationReadyEvent.class);
+		listener.onApplicationEvent(event);
+		assertThat(FileCopyUtils.copyToString(new FileReader(file))).isNotEmpty();
+	}
+
 	@Test
 	public void withNoEnvironment() throws Exception {
 		File file = this.temporaryFolder.newFile();
@@ -170,6 +184,15 @@ public class ApplicationPidFileWriterTests {
 				context);
 	}
 
+	private SpringApplicationEvent createReadyEvent(String propName, String propValue) {
+		ConfigurableEnvironment environment = createEnvironment(propName, propValue);
+		ConfigurableApplicationContext context = mock(
+				ConfigurableApplicationContext.class);
+		given(context.getEnvironment()).willReturn(environment);
+		return new ApplicationReadyEvent(new SpringApplication(), new String[] {},
+				context);
+	}
+
 	private ConfigurableEnvironment createEnvironment(String propName, String propValue) {
 		MockPropertySource propertySource = mockPropertySource(propName, propValue);
 		ConfigurableEnvironment environment = new StandardEnvironment();