/*
 * 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.annotation;

import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * Tells Sleuth that all Sleuth related annotations should be applied to an existing span
 * instead of creating a new one.
 *
 * @author Marcin Grzejszczak
 * @since 1.2.0
 */
@Retention(RetentionPolicy.RUNTIME)
@Inherited
@Target(ElementType.METHOD)
public @interface ContinueSpan {

	/**
	 * Log statement to be appended to the span.
	 * @return - the value passed to the annotation will be used and the framework will
	 * create two events with the {@code .start} and {@code .end} suffixes.
	 */
	String log() default "";

}
