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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 define a method as a MinMaxCounter.
* <p>
* <p>
* Given a method like this:
* <pre><code>
* {@literal @}MinMaxCount(name = "coolName", tags="${'my-cool-tag':'my-cool-value'}")
* public String coolName(String name) {
* return "Hello " + name;
* }
* </code></pre>
* <p>
* <p>
* A {@link kamon.metric.instrument.MinMaxCounter MinMaxCounter} for the defining method with the name {@code coolName} will be created and each time the
* {@code #coolName(String)} method is invoked the counter is decremented when the method returns,
* counting current invocations of the annotated method.
*/
@Documented
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface MinMaxCount {
/**
* @return The MinMaxCounter's name.
* <p>
* Also, the Metric name can be resolved with an EL expression that evaluates to a String:
* <p>
* <pre>
* {@code
* class MinMaxCounted {
* private long id;
*
* public long getId() { return id; }
*
* {@literal @}MinMaxCount (name = "${'counterID:' += this.id}")
* void countedMethod() {} // create a counter with name => counterID:[id]
* }
* }
* </pre>
*/
String name();
/**
* 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 counter
*/
String tags() default "";
}
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