spring SpringApplicationRunListeners 源码
springboot SpringApplicationRunListeners 代码
文件路径:/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/SpringApplicationRunListeners.java
/*
* Copyright 2012-2021 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;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.function.Consumer;
import org.apache.commons.logging.Log;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.metrics.ApplicationStartup;
import org.springframework.core.metrics.StartupStep;
import org.springframework.util.ReflectionUtils;
/**
* A collection of {@link SpringApplicationRunListener}.
*
* @author Phillip Webb
* @author Andy Wilkinson
* @author Chris Bono
*/
class SpringApplicationRunListeners {
private final Log log;
private final List<SpringApplicationRunListener> listeners;
private final ApplicationStartup applicationStartup;
SpringApplicationRunListeners(Log log, Collection<? extends SpringApplicationRunListener> listeners,
ApplicationStartup applicationStartup) {
this.log = log;
this.listeners = new ArrayList<>(listeners);
this.applicationStartup = applicationStartup;
}
void starting(ConfigurableBootstrapContext bootstrapContext, Class<?> mainApplicationClass) {
doWithListeners("spring.boot.application.starting", (listener) -> listener.starting(bootstrapContext),
(step) -> {
if (mainApplicationClass != null) {
step.tag("mainApplicationClass", mainApplicationClass.getName());
}
});
}
void environmentPrepared(ConfigurableBootstrapContext bootstrapContext, ConfigurableEnvironment environment) {
doWithListeners("spring.boot.application.environment-prepared",
(listener) -> listener.environmentPrepared(bootstrapContext, environment));
}
void contextPrepared(ConfigurableApplicationContext context) {
doWithListeners("spring.boot.application.context-prepared", (listener) -> listener.contextPrepared(context));
}
void contextLoaded(ConfigurableApplicationContext context) {
doWithListeners("spring.boot.application.context-loaded", (listener) -> listener.contextLoaded(context));
}
void started(ConfigurableApplicationContext context, Duration timeTaken) {
doWithListeners("spring.boot.application.started", (listener) -> listener.started(context, timeTaken));
}
void ready(ConfigurableApplicationContext context, Duration timeTaken) {
doWithListeners("spring.boot.application.ready", (listener) -> listener.ready(context, timeTaken));
}
void failed(ConfigurableApplicationContext context, Throwable exception) {
doWithListeners("spring.boot.application.failed",
(listener) -> callFailedListener(listener, context, exception), (step) -> {
step.tag("exception", exception.getClass().toString());
step.tag("message", exception.getMessage());
});
}
private void callFailedListener(SpringApplicationRunListener listener, ConfigurableApplicationContext context,
Throwable exception) {
try {
listener.failed(context, exception);
}
catch (Throwable ex) {
if (exception == null) {
ReflectionUtils.rethrowRuntimeException(ex);
}
if (this.log.isDebugEnabled()) {
this.log.error("Error handling failed", ex);
}
else {
String message = ex.getMessage();
message = (message != null) ? message : "no error message";
this.log.warn("Error handling failed (" + message + ")");
}
}
}
private void doWithListeners(String stepName, Consumer<SpringApplicationRunListener> listenerAction) {
doWithListeners(stepName, listenerAction, null);
}
private void doWithListeners(String stepName, Consumer<SpringApplicationRunListener> listenerAction,
Consumer<StartupStep> stepAction) {
StartupStep step = this.applicationStartup.start(stepName);
this.listeners.forEach(listenerAction);
if (stepAction != null) {
stepAction.accept(step);
}
step.end();
}
}
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- 本文标签: Spring Boot Spring Java
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