/*
 * Copyright 2017 NAVER Corp.
 *
 * 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 com.navercorp.pinpoint.profiler.monitor.metric.cpu;

import com.codahale.metrics.Gauge;
import com.navercorp.pinpoint.profiler.monitor.codahale.MetricMonitorValues;

/**
 * @author HyunGil Jeong
 */
public interface CpuLoadMetric {

    Gauge<Double> UNSUPPORTED_GAUGE = new MetricMonitorValues.EmptyGauge<Double>(-1D);

    CpuLoadMetric UNSUPPORTED_CPU_LOAD_METRIC = new CpuLoadMetric() {
        @Override
        public Double jvmCpuLoad() {
            return null;
        }

        @Override
        public Double systemCpuLoad() {
            return null;
        }

        @Override
        public String toString() {
            return "Unsupported CpuLoadMetric";
        }
    };

    Double jvmCpuLoad();

    Double systemCpuLoad();
}