/
Metric.java
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/
Metric.java
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/*
**********************************************************************
* Copyright (c) 2017, 2022 Contributors to the Eclipse Foundation
* 2012 Ryan W Tenney (ryan@10e.us)
*
* 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.ElementType;
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;
/**
* An annotation requesting that a metric be injected or registered. The metric will be registered in the application
* MetricRegistry.
*
* Given an injected field annotated with {@literal @}Metric like this:
*
* <pre>
* <code>
* {@literal @}Inject
* {@literal @}Metric(name="histogram")
* public Histogram histogram;
* </code>
* </pre>
*
* A meter of the field's type will be created and injected into managed objects. It will be up to the user to interact
* with the metric. This annotation can be used on fields of type Meter, Timer, SimpleTimer, Counter, and Histogram.
* <p>
* This may also be used to register a metric.
* </p>
*/
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD, ElementType.PARAMETER, ElementType.ANNOTATION_TYPE})
public @interface Metric {
/**
* The name of the metric.
*
* @return The name of the metric.
*/
@Nonbinding
String name() default "";
/**
* The tags of the metric.
*
* @return The tags of the metric. 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.
*/
@Nonbinding
boolean absolute() default false;
/**
* The description of the metric.
*
* @return The description of the metric.
*
* @see org.eclipse.microprofile.metrics.Metadata
*/
@Nonbinding
String description() default "";
/**
* The unit of the metric.
*
* @return The unit of the metric. 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 metric belongs to.
*
* @return The scope this metric belongs to. By default, the value is {@link MetricRegistry#APPLICATION_SCOPE}.
*
*/
@Nonbinding
String scope() default MetricRegistry.APPLICATION_SCOPE;
}