org.eclipse.microprofile.metrics.annotation.Counted Maven / Gradle / Ivy
/*
**********************************************************************
* Copyright (c) 2017, 2022 Contributors to the Eclipse Foundation
* 2012 Ryan W Tenney ([email protected])
*
* See the NOTICES file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* 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.
*
* SPDX-License-Identifier: Apache-2.0
**********************************************************************/
package org.eclipse.microprofile.metrics.annotation;
import java.lang.annotation.Documented;
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;
import org.eclipse.microprofile.metrics.MetricRegistry;
import org.eclipse.microprofile.metrics.MetricUnits;
import jakarta.enterprise.util.Nonbinding;
import jakarta.interceptor.InterceptorBinding;
/**
* An annotation for marking a method, constructor, or class as counted. The metric will be registered in the
* application MetricRegistry.
*
*
* Given a method annotated with {@literal @}Counted like this:
*
*
*
*
* {@literal @}Counted(name = "fancyName")
* public String fancyName(String name) {
* return "Sir Captain " + name;
* }
*
*
*
* A counter with the fully qualified class name + {@code fancyName} will be created and each time the
* {@code #fancyName(String)} method is invoked, the counter will be marked. Similarly, the same applies for a
* constructor annotated with counted.
*
*
* Given a class annotated with {@literal @}Counted like this:
*
*
*
*
* {@literal @}Counted
* public class CounterBean {
* public void countMethod1() {}
* public void countMethod2() {}
* }
*
*
*
* A counter for the defining class will be created for each of the constructors/methods. Each time the
* constructor/method is invoked, the respective counter will be marked.
*
* The counter value will only monotonically increase.
*
* This annotation will throw an IllegalStateException if the constructor/method is invoked, but the metric no longer
* exists in the MetricRegistry.
*
*/
@Inherited
@Documented
@InterceptorBinding
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE, ElementType.CONSTRUCTOR, ElementType.METHOD, ElementType.ANNOTATION_TYPE})
public @interface Counted {
/**
* The name of the counter.
*
* @return The name of the counter.
*/
@Nonbinding
String name() default "";
/**
* The tags of the counter.
*
* @return The tags of the counter. Each {@code String} tag must be in the form of 'key=value'. If the input is
* empty or does not contain a '=' sign, the entry is ignored.
*
* @see org.eclipse.microprofile.metrics.Metadata
*/
@Nonbinding
String[] tags() default {};
/**
* Denotes whether to use the absolute name or use the default given name relative to the annotated class.
*
* @return If {@code true}, use the given name as an absolute name. If {@code false} (default), use the given name
* relative to the annotated class. When annotating a class, this must be {@code false}.
*/
@Nonbinding
boolean absolute() default false;
/**
* The description of the counter.
*
* @return The description of the counter.
*
* @see org.eclipse.microprofile.metrics.Metadata
*/
@Nonbinding
String description() default "";
/**
* The unit of the counter.
*
* @return The unit of the counter. By default, the value is {@link MetricUnits#NONE}.
*
* @see org.eclipse.microprofile.metrics.Metadata
* @see org.eclipse.microprofile.metrics.MetricUnits
*/
@Nonbinding
String unit() default MetricUnits.NONE;
/**
* The scope that this counter belongs to.
*
* @return The scope this counter belongs to. By default, the value is {@link MetricRegistry#APPLICATION_SCOPE}.
*
*/
@Nonbinding
String scope() default MetricRegistry.APPLICATION_SCOPE;
}