/*-
 * ============LICENSE_START=======================================================
 * ONAP-XACML
 * ================================================================================
 * Copyright (C) 2017-2019 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package org.onap.policy.xacml.util;

public class MetricsUtil {

    private MetricsUtil() {
        //
        // private constructor to hide the implicit public one for utility class
        //
    }

    public static class AvgLatency {
        private long cumLatency = 0;
        private long count = 0;

        public void compute(long latency) {
            cumLatency += latency;
            count++;
        }

        public long avg() {
            if (count == 0)
                return 0;

            return cumLatency / count;
        }

        public void reset() {
            cumLatency = 0;
            count = 0;
        }
    }

    public static class MinLatency {
        private long min = Long.MAX_VALUE;

        public synchronized void compute(long ts) {
            if (ts < min)
                min = ts;
        }

        public long min() {
            return min;
        }

        public void reset() {
            min = Long.MAX_VALUE;
        }
    }

    public static class MaxLatency {
        private long max = Long.MIN_VALUE;

        public synchronized void compute(long ts) {
            if (ts > max)
                max = ts;
        }

        public long max() {
            return max;
        }

        public void reset() {
            max = Long.MIN_VALUE;
        }
    }

}