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Spring Cloud Sleuth AutoConfigure
/*
* Copyright 2013-2021 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.cloud.sleuth.autoconfig.instrument.redis;
import brave.sampler.Sampler;
import io.lettuce.core.tracing.Tracing;
import org.springframework.boot.autoconfigure.AutoConfigureAfter;
import org.springframework.boot.autoconfigure.AutoConfigureBefore;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.cloud.sleuth.Tracer;
import org.springframework.cloud.sleuth.autoconfig.brave.BraveAutoConfiguration;
import org.springframework.cloud.sleuth.autoconfig.brave.instrument.redis.TraceRedisProperties;
import org.springframework.cloud.sleuth.instrument.redis.TraceLettuceClientResourcesBuilderCustomizer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
* {@link org.springframework.boot.autoconfigure.EnableAutoConfiguration
* Auto-configuration} enables Redis span information propagation.
*
* @author Marcin Grzejszczak
* @since 3.1.0
*/
@Configuration(proxyBeanMethods = false)
@ConditionalOnProperty(value = "spring.sleuth.redis.enabled", matchIfMissing = true)
@ConditionalOnBean(Tracer.class)
@ConditionalOnClass(Tracing.class)
@AutoConfigureBefore({ RedisAutoConfiguration.class })
@AutoConfigureAfter(BraveAutoConfiguration.class)
@EnableConfigurationProperties(TraceRedisProperties.class)
public class TraceRedisAutoConfiguration {
@Configuration(proxyBeanMethods = false)
@ConditionalOnProperty(value = "spring.sleuth.redis.legacy.enabled", havingValue = "false", matchIfMissing = true)
@ConditionalOnBean(Tracing.class)
static class LettuceConfiguration {
@Bean
@ConditionalOnClass(name = "brave.sampler.Sampler")
TraceLettuceClientResourcesBuilderCustomizer braveTraceLettuceClientResourcesBuilderCustomizer(Tracing tracing,
Sampler sampler) {
eagerlyInitializePotentiallyRefreshScopeSampler(sampler);
return new TraceLettuceClientResourcesBuilderCustomizer(tracing);
}
@Bean
@ConditionalOnMissingClass("brave.sampler.Sampler")
TraceLettuceClientResourcesBuilderCustomizer otherTracersTraceLettuceClientResourcesBuilderCustomizer(
Tracing tracing) {
return new TraceLettuceClientResourcesBuilderCustomizer(tracing);
}
/**
* We need to do the eager method invocation. Since this might be @RefreshScope, a
* proxy is being created. Trying to resolve the proxy from a different thread
* than main can lead to cross thread locking.
* @param sampler potentially refresh scope sampler
*/
private void eagerlyInitializePotentiallyRefreshScopeSampler(Sampler sampler) {
sampler.isSampled(0L);
}
}
}