net.uncontended.precipice.metrics.MetricCounter Maven / Gradle / Ivy

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/*
 * Copyright 2014 Timothy Brooks
 *
 * 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 net.uncontended.precipice.metrics;

import net.uncontended.precipice.concurrent.util.LongAdder;

public class MetricCounter> implements CountMetrics {

    private final LongAdder[] metrics;
    private final Class clazz;

    public MetricCounter(Class clazz) {
        this.clazz = clazz;
        T[] metricValues = clazz.getEnumConstants();

        metrics = new LongAdder[metricValues.length];
        for (T metric : metricValues) {
            metrics[metric.ordinal()] = new LongAdder();
        }
    }

    @Override
    public void incrementMetricCount(T metric) {
        metrics[metric.ordinal()].increment();
    }

    @Override
    public void incrementMetricCount(T metric, long nanoTime) {
        metrics[metric.ordinal()].increment();
    }

    @Override
    public long getMetricCount(T metric) {
        return metrics[metric.ordinal()].longValue();
    }

    @Override
    public Class getMetricType() {
        return clazz;
    }

    public static > MetricCounter newCounter(Class clazz) {
        return new MetricCounter<>(clazz);
    }

    public static > MetricCounter noOpCounter(Class clazz) {
        return new MetricCounter(clazz) {

            @Override
            public void incrementMetricCount(T metric) {
            }

            @Override
            public void incrementMetricCount(T metric, long nanoTime) {
            }

            @Override
            public long getMetricCount(T metric) {
                return 0;
            }
        };
    }
}