org.molgenis.metrics.MolgenisTimedAspect.java Source code

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Here is the source code for org.molgenis.metrics.MolgenisTimedAspect.java

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/*
 * Copyright 2017 Pivotal Software, Inc.
 *
 * <p>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
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>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 org.molgenis.metrics;

import io.micrometer.core.annotation.Timed;
import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.Tag;
import io.micrometer.core.instrument.Tags;
import io.micrometer.core.instrument.Timer;
import io.micrometer.core.lang.NonNullApi;
import java.lang.reflect.Method;
import java.util.function.Function;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.reflect.MethodSignature;

/**
 * AspectJ aspect for intercepting types or method annotated with @Timed.
 *
 * <p>Copied from micrometer.io and adapted to also work for annotated classes.
 *
 * @author David J. M. Karlsen
 * @author Jon Schneider
 * @author Fleur Kelpin
 */
@Aspect
@NonNullApi
public class MolgenisTimedAspect {

    private final MeterRegistry registry;
    private final Function<ProceedingJoinPoint, Iterable<Tag>> tagsBasedOnJoinpoint;

    MolgenisTimedAspect(MeterRegistry registry) {
        this(registry, pjp -> Tags.of("class", pjp.getStaticPart().getSignature().getDeclaringTypeName(), "method",
                pjp.getStaticPart().getSignature().getName()));
    }

    MolgenisTimedAspect(MeterRegistry registry, Function<ProceedingJoinPoint, Iterable<Tag>> tagsBasedOnJoinpoint) {
        this.registry = registry;
        this.tagsBasedOnJoinpoint = tagsBasedOnJoinpoint;
    }

    @Around("execution(* (@io.micrometer.core.annotation.Timed *).*(..))")
    public Object timedClassMethod(ProceedingJoinPoint pjp) throws Throwable {
        Method method = ((MethodSignature) pjp.getSignature()).getMethod();
        return timedProceed(pjp, method.getDeclaringClass().getAnnotation(Timed.class));
    }

    @Around("execution (@io.micrometer.core.annotation.Timed * *.*(..))")
    public Object timedMethod(ProceedingJoinPoint pjp) throws Throwable {
        Method method = ((MethodSignature) pjp.getSignature()).getMethod();
        return timedProceed(pjp, method.getAnnotation(Timed.class));
    }

    private Object timedProceed(ProceedingJoinPoint pjp, Timed timed) throws Throwable {
        if (timed.value().isEmpty()) {
            return pjp.proceed();
        }
        Timer.Sample sample = Timer.start(registry);
        try {
            return pjp.proceed();
        } finally {
            sample.stop(Timer.builder(timed.value())
                    .description(timed.description().isEmpty() ? null : timed.description()).tags(timed.extraTags())
                    .tags(tagsBasedOnJoinpoint.apply(pjp)).publishPercentileHistogram(timed.histogram())
                    .publishPercentiles(timed.percentiles().length == 0 ? null : timed.percentiles())
                    .register(registry));
        }
    }
}