zipkin2.server.internal.kafka.ZipkinKafkaCollectorConfiguration Maven / Gradle / Ivy
/*
* Copyright The OpenZipkin Authors
* SPDX-License-Identifier: Apache-2.0
*/
package zipkin2.server.internal.kafka;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Condition;
import org.springframework.context.annotation.ConditionContext;
import org.springframework.context.annotation.Conditional;
import org.springframework.core.type.AnnotatedTypeMetadata;
import zipkin2.collector.CollectorMetrics;
import zipkin2.collector.CollectorSampler;
import zipkin2.collector.kafka.KafkaCollector;
import zipkin2.storage.StorageComponent;
/**
* This collector consumes a topic, decodes spans from thrift messages and stores them subject to
* sampling policy.
*/
@ConditionalOnClass(KafkaCollector.class)
@Conditional(ZipkinKafkaCollectorConfiguration.KafkaBootstrapServersSet.class)
@EnableConfigurationProperties(ZipkinKafkaCollectorProperties.class)
public class ZipkinKafkaCollectorConfiguration { // makes simple type name unique for /actuator/conditions
@Bean(initMethod = "start")
KafkaCollector kafka(
ZipkinKafkaCollectorProperties properties,
CollectorSampler sampler,
CollectorMetrics metrics,
StorageComponent storage) {
return properties.toBuilder().sampler(sampler).metrics(metrics).storage(storage).build();
}
/**
* This condition passes when {@link ZipkinKafkaCollectorProperties#getBootstrapServers()} is set
* to non-empty.
*
* This is here because the yaml defaults this property to empty like this, and spring-boot
* doesn't have an option to treat empty properties as unset.
*
*
{@code
* bootstrap-servers: ${KAFKA_BOOTSTRAP_SERVERS:}
* }
*/
static final class KafkaBootstrapServersSet implements Condition {
@Override
public boolean matches(ConditionContext context, AnnotatedTypeMetadata a) {
return !isEmpty(
context.getEnvironment().getProperty("zipkin.collector.kafka.bootstrap-servers")) &&
notFalse(context.getEnvironment().getProperty("zipkin.collector.kafka.enabled"));
}
private static boolean isEmpty(String s) {
return s == null || s.isEmpty();
}
private static boolean notFalse(String s){
return s == null || !s.equals("false");
}
}
}