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Polish "Make it possible to disable the BackgroundPreinitializer" 

Closes gh-14298
This commit is contained in:
Stephane Nicoll 2018-09-05 14:09:14 +02:00
parent 5779767513
commit 304c6a02ba
1 changed files with 42 additions and 35 deletions
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77
spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/BackgroundPreinitializer.java
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@ -38,8 +38,11 @@ import org.springframework.http.converter.support.AllEncompassingFormHttpMessage
/**
* {@link ApplicationListener} to trigger early initialization in a background thread of
* time consuming tasks. Set property spring.backgroundpreinitializer.ignore=true for
* disable background preinitializer.
* time consuming tasks.
* <p>
* Set the {@value IGNORE_BACKGROUNDPREINITIALIZER_PROPERTY_NAME} system property to
* {@code true} to disable this mechanism and let such initialization happen in the
* foreground.
*
* @author Phillip Webb
* @author Andy Wilkinson
@ -50,6 +53,15 @@ import org.springframework.http.converter.support.AllEncompassingFormHttpMessage
public class BackgroundPreinitializer
implements ApplicationListener<SpringApplicationEvent> {
/**
* System property that instructs Spring Boot how to run pre initialization. When the
* property is set to {@code true}, no pre intialization happens and each item is
* initialized in the foreground as it needs to. When the property is {@code false}
* (default), pre initialization runs in a separate thread in the background.
* @since 2.1.0
*/
public static final String IGNORE_BACKGROUNDPREINITIALIZER_PROPERTY_NAME = "spring.backgroundpreinitializer.ignore";
private static final AtomicBoolean preinitializationStarted = new AtomicBoolean(
false);
@ -57,11 +69,10 @@ public class BackgroundPreinitializer
@Override
public void onApplicationEvent(SpringApplicationEvent event) {
if (!Boolean.getBoolean("spring.backgroundpreinitializer.ignore")) {
if (event instanceof ApplicationStartingEvent
&& preinitializationStarted.compareAndSet(false, true)) {
this.background(this.performPreinitialization());
}
if (!Boolean.getBoolean(IGNORE_BACKGROUNDPREINITIALIZER_PROPERTY_NAME)
&& event instanceof ApplicationStartingEvent
&& preinitializationStarted.compareAndSet(false, true)) {
performPreinitialization();
}
if ((event instanceof ApplicationReadyEvent
|| event instanceof ApplicationFailedEvent)
@ -75,9 +86,31 @@ public class BackgroundPreinitializer
}
}
private void background(Runnable runnable) {
private void performPreinitialization() {
try {
Thread thread = new Thread(runnable, "background-preinit");
Thread thread = new Thread(new Runnable() {
@Override
public void run() {
runSafely(new ConversionServiceInitializer());
runSafely(new ValidationInitializer());
runSafely(new MessageConverterInitializer());
runSafely(new MBeanFactoryInitializer());
runSafely(new JacksonInitializer());
runSafely(new CharsetInitializer());
preinitializationComplete.countDown();
}
public void runSafely(Runnable runnable) {
try {
runnable.run();
}
catch (Throwable ex) {
// Ignore
}
}
}, "background-preinit");
thread.start();
}
catch (Exception ex) {
@ -88,32 +121,6 @@ public class BackgroundPreinitializer
}
}
private Runnable performPreinitialization() {
return new Runnable() {
@Override
public void run() {
runSafely(new ConversionServiceInitializer());
runSafely(new ValidationInitializer());
runSafely(new MessageConverterInitializer());
runSafely(new MBeanFactoryInitializer());
runSafely(new JacksonInitializer());
runSafely(new CharsetInitializer());
preinitializationComplete.countDown();
}
public void runSafely(Runnable runnable) {
try {
runnable.run();
}
catch (Throwable ex) {
// Ignore
}
}
};
}
/**
* Early initializer for Spring MessageConverters.
*/