com.yammer.metrics.annotation.Timed Maven / Gradle / Ivy

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A dependency-less package of just the annotations used by other Metrics modules.

There is a newer version: 3.0.0-BETA1

package com.yammer.metrics.annotation;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.util.concurrent.TimeUnit;

/**
 * An annotation for marking a method of a Guice-provided object as timed.
 * 
 * Given a method like this:
 * 

 *     \@Timed(name = "fancyName", rateUnit = TimeUnit.SECONDS, durationUnit =
 * TimeUnit.MICROSECONDS)
 *     public String fancyName(String name) {
 *         return "Sir Captain " + name;
 *     }
 * 
 * 
 * A timer for the defining class with the name {@code fancyName} will be created and each time the
 * {@code #fancyName(String)} method is invoked, the method's execution will be timed.
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface Timed {
    /**
     * The name of the timer.
     */
    String name() default "";

    /**
     * The time unit of the timer's rate.
     */
    TimeUnit rateUnit() default TimeUnit.SECONDS;

    /**
     * The time unit of the timer's duration.
     */
    TimeUnit durationUnit() default TimeUnit.MILLISECONDS;
}