org.springframework.boot.context.logging.ClasspathLoggingApplicationListener Maven / Gradle / Ivy
/*
* Copyright 2012-2018 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.context.logging;
import java.net.URLClassLoader;
import java.util.Arrays;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent;
import org.springframework.boot.context.event.ApplicationFailedEvent;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.event.GenericApplicationListener;
import org.springframework.context.event.SmartApplicationListener;
import org.springframework.core.ResolvableType;
/**
* A {@link SmartApplicationListener} that reacts to
* {@link ApplicationEnvironmentPreparedEvent environment prepared events} and to
* {@link ApplicationFailedEvent failed events} by logging the classpath of the thread
* context class loader (TCCL) at {@code DEBUG} level.
*
* @author Andy Wilkinson
* @since 2.0.0
*/
public final class ClasspathLoggingApplicationListener
implements GenericApplicationListener {
private static final int ORDER = LoggingApplicationListener.DEFAULT_ORDER + 1;
private static final Log logger = LogFactory
.getLog(ClasspathLoggingApplicationListener.class);
@Override
public void onApplicationEvent(ApplicationEvent event) {
if (logger.isDebugEnabled()) {
if (event instanceof ApplicationEnvironmentPreparedEvent) {
logger.debug("Application started with classpath: " + getClasspath());
}
else if (event instanceof ApplicationFailedEvent) {
logger.debug(
"Application failed to start with classpath: " + getClasspath());
}
}
}
@Override
public int getOrder() {
return ORDER;
}
@Override
public boolean supportsEventType(ResolvableType resolvableType) {
Class type = resolvableType.getRawClass();
if (type == null) {
return false;
}
return ApplicationEnvironmentPreparedEvent.class.isAssignableFrom(type)
|| ApplicationFailedEvent.class.isAssignableFrom(type);
}
private String getClasspath() {
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
if (classLoader instanceof URLClassLoader) {
return Arrays.toString(((URLClassLoader) classLoader).getURLs());
}
return "unknown";
}
}