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Spring Boot Actuator AutoConfigure
/*
* Copyright 2012-2019 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.actuate.autoconfigure.metrics;
import java.util.Collections;
import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.binder.logging.Log4j2Metrics;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.core.LoggerContext;
import org.springframework.boot.actuate.autoconfigure.metrics.Log4J2MetricsAutoConfiguration.Log4JCoreLoggerContextCondition;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.context.annotation.Conditional;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.type.AnnotatedTypeMetadata;
/**
* Auto-configuration for Log4J2 metrics.
*
* @author Andy Wilkinson
* @since 2.1.0
*/
@Configuration
@AutoConfigureAfter(MetricsAutoConfiguration.class)
@ConditionalOnClass({ Log4j2Metrics.class, LoggerContext.class, LogManager.class })
@ConditionalOnBean(MeterRegistry.class)
@Conditional(Log4JCoreLoggerContextCondition.class)
public class Log4J2MetricsAutoConfiguration {
@Bean
@ConditionalOnMissingBean
public Log4j2Metrics log4j2Metrics() {
return new Log4j2Metrics(Collections.emptyList(), (LoggerContext) LogManager.getContext(false));
}
static class Log4JCoreLoggerContextCondition extends SpringBootCondition {
@Override
public ConditionOutcome getMatchOutcome(ConditionContext context, AnnotatedTypeMetadata metadata) {
org.apache.logging.log4j.spi.LoggerContext loggerContext = LogManager.getContext(false);
if (loggerContext instanceof LoggerContext) {
return ConditionOutcome
.match("LoggerContext was an instance of org.apache.logging.log4j.spi.LoggerContext");
}
return ConditionOutcome
.noMatch("Logger context was not an instance of org.apache.logging.log4j.spi.LoggerContext");
}
}
}