components/camel-microprofile-metrics/src/main/java/org/apache/camel/component/microprofile/metrics/MicroProfileMetricsHistogramProducer.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.camel.component.microprofile.metrics;

import java.util.List;
import java.util.function.Function;

import org.apache.camel.Exchange;
import org.eclipse.microprofile.metrics.Histogram;
import org.eclipse.microprofile.metrics.Metadata;
import org.eclipse.microprofile.metrics.MetricRegistry;
import org.eclipse.microprofile.metrics.Tag;

import static org.apache.camel.component.microprofile.metrics.MicroProfileMetricsConstants.HEADER_HISTOGRAM_VALUE;

public class MicroProfileMetricsHistogramProducer extends AbstractMicroProfileMetricsProducer<Histogram> {

    public MicroProfileMetricsHistogramProducer(MicroProfileMetricsEndpoint endpoint) {
        super(endpoint);
    }

    @Override
    protected void doProcess(Exchange exchange, MicroProfileMetricsEndpoint endpoint, Histogram histogram) {
        Long value = getLongHeader(exchange.getIn(), HEADER_HISTOGRAM_VALUE, endpoint.getValue());
        if (value != null) {
            histogram.update(value);
        }
    }

    @Override
    protected Function<MetricRegistry, Histogram> registerMetric(Metadata metadata, List<Tag> tags) {
        return metricRegistry -> metricRegistry.histogram(metadata, tags.toArray(new Tag[0]));
    }
}