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Log ApplicationAvailability state changes 

Fixes gh-23098
This commit is contained in:
Scott Frederick 2021-04-13 16:29:00 -05:00
parent 5f95766858
commit bf8051cd47
2 changed files with 59 additions and 0 deletions
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27
spring-boot-project/spring-boot/src/main/java/org/springframework/boot/availability/ApplicationAvailabilityBean.java
View File

@ -19,6 +19,10 @@ package org.springframework.boot.availability;
import java.util.HashMap;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.context.ApplicationListener;
import org.springframework.util.Assert;
@ -34,6 +38,8 @@ import org.springframework.util.Assert;
public class ApplicationAvailabilityBean
implements ApplicationAvailability, ApplicationListener<AvailabilityChangeEvent<?>> {
private static final Log logger = LogFactory.getLog(ApplicationAvailability.class);
private final Map<Class<? extends AvailabilityState>, AvailabilityChangeEvent<?>> events = new HashMap<>();
@Override
@ -58,10 +64,31 @@ public class ApplicationAvailabilityBean
@Override
public void onApplicationEvent(AvailabilityChangeEvent<?> event) {
logStateChange(event);
Class<? extends AvailabilityState> stateType = getStateType(event.getState());
this.events.put(stateType, event);
}
private void logStateChange(AvailabilityChangeEvent<?> event) {
Class<? extends AvailabilityState> stateType = getStateType(event.getState());
StringBuilder message = new StringBuilder(
"Application availability state " + stateType.getSimpleName() + " changed");
AvailabilityChangeEvent<? extends AvailabilityState> lastChangeEvent = getLastChangeEvent(stateType);
if (lastChangeEvent != null) {
message.append(" from " + lastChangeEvent.getState());
}
message.append(" to " + event.getState());
if (event.getSource() != null) {
if (event.getSource() instanceof Throwable) {
message.append(": " + event.getSource());
}
else if (!(event.getSource() instanceof ApplicationEventPublisher)) {
message.append(": " + event.getSource().getClass().getName());
}
}
logger.info(message);
}
@SuppressWarnings("unchecked")
private Class<? extends AvailabilityState> getStateType(AvailabilityState state) {
if (state instanceof Enum) {

32
spring-boot-project/spring-boot/src/test/java/org/springframework/boot/availability/ApplicationAvailabilityBeanTests.java
View File

@ -16,9 +16,14 @@
package org.springframework.boot.availability;
import java.io.IOException;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.boot.testsupport.system.CapturedOutput;
import org.springframework.boot.testsupport.system.OutputCaptureExtension;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import static org.assertj.core.api.Assertions.assertThat;
@ -29,6 +34,7 @@ import static org.assertj.core.api.Assertions.assertThat;
* @author Brian Clozel
* @author Phillip Webb
*/
@ExtendWith(OutputCaptureExtension.class)
class ApplicationAvailabilityBeanTests {
private AnnotationConfigApplicationContext context;
@ -87,6 +93,28 @@ class ApplicationAvailabilityBeanTests {
assertThat(this.availability.getLastChangeEvent(TestState.class)).isNotNull();
}
@Test
void stateChangesAreLogged(CapturedOutput output) {
AvailabilityChangeEvent.publish(this.context, LivenessState.CORRECT);
assertThat(output).contains("Application availability state LivenessState changed to CORRECT\n");
AvailabilityChangeEvent.publish(this.context, LivenessState.BROKEN);
assertThat(output).contains("Application availability state LivenessState changed from CORRECT to BROKEN\n");
}
@Test
void stateChangesAreLoggedWithExceptionSource(CapturedOutput output) {
AvailabilityChangeEvent.publish(this.context, new IOException("connection error"), LivenessState.BROKEN);
assertThat(output).contains("Application availability state LivenessState changed to BROKEN: "
+ "java.io.IOException: connection error\n");
}
@Test
void stateChangesAreLoggedWithOtherSource(CapturedOutput output) {
AvailabilityChangeEvent.publish(this.context, new CustomEventSource(), LivenessState.BROKEN);
assertThat(output).contains("Application availability state LivenessState changed to BROKEN: "
+ CustomEventSource.class.getName() + "\n");
}
enum TestState implements AvailabilityState {
ONE {
@ -107,4 +135,8 @@ class ApplicationAvailabilityBeanTests {
}
static class CustomEventSource {
}
}