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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.brave;
import brave.sampler.CountingSampler;
import brave.sampler.Sampler;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.cloud.sleuth.brave.sampler.ProbabilityBasedSampler;
import org.springframework.cloud.sleuth.brave.sampler.RateLimitingSampler;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Conditional;
import org.springframework.context.annotation.Configuration;
/**
* {@linkplain Configuration configuration} for {@link Sampler}.
*
* @author Marcin Grzejszczak
* @see SamplerCondition
* @since 2.1.0
*/
@Configuration(proxyBeanMethods = false)
@EnableConfigurationProperties(SamplerProperties.class)
class BraveSamplerConfiguration {
@Bean
@ConditionalOnMissingBean
Sampler sleuthTraceSampler() {
return Sampler.NEVER_SAMPLE;
}
// NOTE: Brave's default samplers return Sampler.NEVER_SAMPLE if the config implies
// that
static Sampler samplerFromProps(SamplerProperties config) {
if (config.getProbability() != null) {
return CountingSampler.create(config.getProbability());
}
return brave.sampler.RateLimitingSampler.create(config.getRate());
}
@Configuration(proxyBeanMethods = false)
@Conditional(SamplerCondition.class)
@ConditionalOnBean(type = "org.springframework.cloud.context.scope.refresh.RefreshScope")
protected static class RefreshScopedSamplerConfiguration {
@Bean
@RefreshScope
@ConditionalOnMissingBean
@ConditionalOnProperty(value = "spring.sleuth.sampler.refresh.enabled", matchIfMissing = true)
public Sampler defaultTraceSampler(SamplerProperties config) {
return sampler(config);
}
@Bean
@ConditionalOnMissingBean
@ConditionalOnProperty(value = "spring.sleuth.sampler.refresh.enabled", havingValue = "false")
public Sampler defaultNonRefreshScopeTraceSampler(SamplerProperties config) {
return sampler(config);
}
private Sampler sampler(SamplerProperties config) {
// TODO: Rewrite: refresh should replace the sampler, not change its state
// internally
if (config.getProbability() != null) {
return new ProbabilityBasedSampler(config::getProbability);
}
return new RateLimitingSampler(config::getRate);
}
}
@Configuration(proxyBeanMethods = false)
@Conditional(SamplerCondition.class)
@ConditionalOnMissingBean(type = "org.springframework.cloud.context.scope.refresh.RefreshScope")
protected static class NonRefreshScopeSamplerConfiguration {
@Bean
@ConditionalOnMissingBean
public Sampler defaultTraceSampler(SamplerProperties config) {
return samplerFromProps(config);
}
}
}