spring EnvironmentPostProcessorApplicationListener 源码
springboot EnvironmentPostProcessorApplicationListener 代码
文件路径:/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/env/EnvironmentPostProcessorApplicationListener.java
/*
* Copyright 2012-2022 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.boot.env;
import java.util.List;
import java.util.function.Function;
import org.springframework.boot.ConfigurableBootstrapContext;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent;
import org.springframework.boot.context.event.ApplicationFailedEvent;
import org.springframework.boot.context.event.ApplicationPreparedEvent;
import org.springframework.boot.logging.DeferredLogs;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.event.SmartApplicationListener;
import org.springframework.core.Ordered;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.io.ResourceLoader;
/**
* {@link SmartApplicationListener} used to trigger {@link EnvironmentPostProcessor
* EnvironmentPostProcessors} registered in the {@code spring.factories} file.
*
* @author Phillip Webb
* @since 2.4.0
*/
public class EnvironmentPostProcessorApplicationListener implements SmartApplicationListener, Ordered {
/**
* The default order for the processor.
*/
public static final int DEFAULT_ORDER = Ordered.HIGHEST_PRECEDENCE + 10;
private final DeferredLogs deferredLogs;
private int order = DEFAULT_ORDER;
private final Function<ClassLoader, EnvironmentPostProcessorsFactory> postProcessorsFactory;
/**
* Create a new {@link EnvironmentPostProcessorApplicationListener} with
* {@link EnvironmentPostProcessor} classes loaded via {@code spring.factories}.
*/
public EnvironmentPostProcessorApplicationListener() {
this(EnvironmentPostProcessorsFactory::fromSpringFactories);
}
/**
* Create a new {@link EnvironmentPostProcessorApplicationListener} with post
* processors created by the given factory.
* @param postProcessorsFactory the post processors factory
*/
private EnvironmentPostProcessorApplicationListener(
Function<ClassLoader, EnvironmentPostProcessorsFactory> postProcessorsFactory) {
this.postProcessorsFactory = postProcessorsFactory;
this.deferredLogs = new DeferredLogs();
}
/**
* Factory method that creates an {@link EnvironmentPostProcessorApplicationListener}
* with a specific {@link EnvironmentPostProcessorsFactory}.
* @param postProcessorsFactory the environment post processor factory
* @return an {@link EnvironmentPostProcessorApplicationListener} instance
*/
public static EnvironmentPostProcessorApplicationListener with(
EnvironmentPostProcessorsFactory postProcessorsFactory) {
return new EnvironmentPostProcessorApplicationListener((classloader) -> postProcessorsFactory);
}
@Override
public boolean supportsEventType(Class<? extends ApplicationEvent> eventType) {
return ApplicationEnvironmentPreparedEvent.class.isAssignableFrom(eventType)
|| ApplicationPreparedEvent.class.isAssignableFrom(eventType)
|| ApplicationFailedEvent.class.isAssignableFrom(eventType);
}
@Override
public void onApplicationEvent(ApplicationEvent event) {
if (event instanceof ApplicationEnvironmentPreparedEvent environmentPreparedEvent) {
onApplicationEnvironmentPreparedEvent(environmentPreparedEvent);
}
if (event instanceof ApplicationPreparedEvent) {
onApplicationPreparedEvent();
}
if (event instanceof ApplicationFailedEvent) {
onApplicationFailedEvent();
}
}
private void onApplicationEnvironmentPreparedEvent(ApplicationEnvironmentPreparedEvent event) {
ConfigurableEnvironment environment = event.getEnvironment();
SpringApplication application = event.getSpringApplication();
for (EnvironmentPostProcessor postProcessor : getEnvironmentPostProcessors(application.getResourceLoader(),
event.getBootstrapContext())) {
postProcessor.postProcessEnvironment(environment, application);
}
}
private void onApplicationPreparedEvent() {
finish();
}
private void onApplicationFailedEvent() {
finish();
}
private void finish() {
this.deferredLogs.switchOverAll();
}
List<EnvironmentPostProcessor> getEnvironmentPostProcessors(ResourceLoader resourceLoader,
ConfigurableBootstrapContext bootstrapContext) {
ClassLoader classLoader = (resourceLoader != null) ? resourceLoader.getClassLoader() : null;
EnvironmentPostProcessorsFactory postProcessorsFactory = this.postProcessorsFactory.apply(classLoader);
return postProcessorsFactory.getEnvironmentPostProcessors(this.deferredLogs, bootstrapContext);
}
@Override
public int getOrder() {
return this.order;
}
public void setOrder(int order) {
this.order = order;
}
}
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