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Perform background preinitialization once per class loader 

Background preinitialization triggers static initialization of a
number of components that are slow to initialize. As the
initialization is static, it's only necessary once per class loader.

Previously, a new background preinitialization thread would be
created and started for each ApplicationEnvironmentPreparedEvent.
This commit updates the preinitializer to only create and start the
thread if preinitialization has not already been started for the
current class loader.

Closes gh-9869
This commit is contained in:
Andy Wilkinson 2017-07-27 08:38:25 +01:00
parent 6f864c6210
commit 42eec50e90
1 changed files with 10 additions and 0 deletions
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10
spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/BackgroundPreinitializer.java
View File

@ -16,6 +16,8 @@
package org.springframework.boot.autoconfigure; package org.springframework.boot.autoconfigure;
import java.util.concurrent.atomic.AtomicBoolean;
import javax.validation.Validation; import javax.validation.Validation;
import org.apache.catalina.mbeans.MBeanFactory; import org.apache.catalina.mbeans.MBeanFactory;
@ -40,8 +42,16 @@ import org.springframework.http.converter.support.AllEncompassingFormHttpMessage
public class BackgroundPreinitializer public class BackgroundPreinitializer
implements ApplicationListener<ApplicationEnvironmentPreparedEvent> { implements ApplicationListener<ApplicationEnvironmentPreparedEvent> {
private static final AtomicBoolean preinitalizationStarted = new AtomicBoolean(false);
@Override @Override
public void onApplicationEvent(ApplicationEnvironmentPreparedEvent event) { public void onApplicationEvent(ApplicationEnvironmentPreparedEvent event) {
if (preinitalizationStarted.compareAndSet(false, true)) {
performPreinitialization();
}
}
private void performPreinitialization() {
try { try {
Thread thread = new Thread(new Runnable() { Thread thread = new Thread(new Runnable() {