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/*
* =========================================================================================
* Copyright © 2013-2015 the kamon project <http://kamon.io/>
*
* 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 kamon.annotation;
import java.lang.annotation.*;
/**
* A marker annotation to start a new Trace.
* <p>
* <p>
* Given a method like this:
* <pre><code>
* {@literal @}Trace("coolTraceName", tags="${'my-cool-tag':'my-cool-value'}")
* public String coolName(String name) {
* return "Hello " + name;
* }
* </code></pre>
* <p>
* <p>
* A new Trace will be created for the defining method with the name each time the
* {@code #coolName(String)} method is invoked.
*/
@Documented
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Trace {
/**
* @return The Trace's name.
* <p>
* Also, the Trace name can be resolved with an EL expression that evaluates to a String:
* <p>
* <pre>
* {@code
* class Traced {
* private long id;
*
* public long getId() { return id; }
*
* {@literal @}Trace (name = "${'traceID:' += this.id}")
* void countedMethod() {} // create a Trace with name => traceID:[id]
* }
* }
* </pre>
*/
String value();
/**
* Tags are a way of adding dimensions to metrics,
* these are constructed using EL syntax e.g. "${'algorithm':'1','env':'production'}"
*
* @return the tags associated to the trace
*/
String tags() default "";
}
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