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Cassandra support for Spring Data
/*
* Copyright 2022-2024 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.data.cassandra.observability;
import io.micrometer.observation.Observation;
import java.lang.reflect.Method;
import javax.annotation.Nonnull;
import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.springframework.aop.framework.ProxyFactory;
import org.springframework.lang.Nullable;
import org.springframework.util.ClassUtils;
import com.datastax.oss.driver.api.core.cql.Statement;
/**
* Trace implementation of a {@link Statement}.
*
* @author Mark Paluch
* @author Marcin Grzejszczak
* @since 4.0
*/
final class ObservationStatement implements MethodInterceptor {
private final Observation observation;
private Statement delegate;
private ObservationStatement(Observation observation, Statement delegate) {
this.observation = observation;
this.delegate = delegate;
}
/**
* Creates a proxy with {@link ObservationStatement} attached to it.
*
* @param observation current observation
* @param target target to proxy
* @param type of target
* @return proxied object with trace advice
*/
@SuppressWarnings("unchecked")
public static T createProxy(Observation observation, T target) {
ProxyFactory factory = new ProxyFactory(ClassUtils.getAllInterfaces(target));
factory.addInterface(CassandraObservationSupplier.class);
factory.setTarget(target);
factory.addAdvice(new ObservationStatement(observation, (Statement) target));
return (T) factory.getProxy();
}
/**
* @param statement target statement to inspect
* @return whether the given {@code statement} is a traced statement wrapper
*/
public static boolean isObservationStatement(Statement statement) {
return statement instanceof CassandraObservationSupplier;
}
@Nullable
@Override
public Object invoke(@Nonnull MethodInvocation invocation) throws Throwable {
Method method = invocation.getMethod();
if (method.getName().equals("getTargetClass")) {
return this.delegate.getClass();
}
if (method.getName().equals("getObservation")) {
return this.observation;
}
Object result = invocation.proceed();
if (result instanceof Statement) {
this.delegate = (Statement) result;
}
return result;
}
}