TraceZipkinCassandra3StorageAutoConfiguration.java

/**
 * Copyright 2015-2017 The OpenZipkin 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
 *
 * http://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 zipkin.autoconfigure.storage.cassandra3.brave;

import com.github.kristofa.brave.Brave;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Lazy;
import zipkin.storage.cassandra3.Cassandra3Storage.SessionFactory;

/** Sets up the Cassandra tracing in Brave as an initialization. */
@ConditionalOnBean(Brave.class)
@ConditionalOnProperty(name = "zipkin.storage.type", havingValue = "cassandra3")
@Configuration
// This component is named .*Cassandra3.* even though the package already says cassandra3 because
// Spring Boot configuration endpoints only printout the simple name of the class
public class TraceZipkinCassandra3StorageAutoConfiguration {
  final SessionFactory delegate = SessionFactory.DEFAULT;

  // Lazy to unwind a circular dep: we are tracing the storage used by brave
  @Autowired @Lazy Brave brave;

  @Bean SessionFactory tracingSessionFactory() {
    return storage -> TracedSession.create(delegate.create(storage), brave);
  }
}