io.micrometer.core.instrument.dropwizard.DropwizardGauge Maven / Gradle / Ivy

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Application monitoring instrumentation facade

There is a newer version: 1.13.2

/**
 * Copyright 2017 Pivotal Software, Inc.
 * 
 * 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.
 */
package io.micrometer.core.instrument.dropwizard;

import io.micrometer.core.instrument.AbstractMeter;
import io.micrometer.core.instrument.Gauge;
import io.micrometer.core.instrument.Meter;
import io.micrometer.core.instrument.util.MeterEquivalence;

/**
 * @author Jon Schneider
 */
public class DropwizardGauge extends AbstractMeter implements Gauge {
    private final com.codahale.metrics.Gauge impl;

    DropwizardGauge(Meter.Id id, com.codahale.metrics.Gauge impl) {
        super(id);
        this.impl = impl;
    }

    @Override
    public double value() {
        Double value = impl.getValue();
        return value == null ? Double.NaN : value;
    }

    @SuppressWarnings("EqualsWhichDoesntCheckParameterClass")
    @Override
    public boolean equals(Object o) {
        return MeterEquivalence.equals(this, o);
    }

    @Override
    public int hashCode() {
        return MeterEquivalence.hashCode(this);
    }
}