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Swirlds is a software platform designed to build fully-distributed applications that harness the power of the cloud without servers. Now you can develop applications with fairness in decision making, speed, trust and reliability, at a fraction of the cost of traditional server-based platforms.

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/*
 * Copyright (C) 2016-2024 Hedera Hashgraph, LLC
 *
 * 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.swirlds.common.metrics.platform;

import com.swirlds.base.time.Time;
import com.swirlds.base.utility.ToStringBuilder;
import com.swirlds.common.metrics.SpeedometerMetric;
import com.swirlds.common.metrics.statistics.StatsBuffered;
import com.swirlds.common.metrics.statistics.StatsSpeedometer;
import edu.umd.cs.findbugs.annotations.NonNull;

/**
 * Platform-implementation of {@link SpeedometerMetric}
 */
public class PlatformSpeedometerMetric extends AbstractDistributionMetric implements SpeedometerMetric {

    @SuppressWarnings("removal")
    private final StatsSpeedometer speedometer;

    /**
     * Constructs a new PlatformSpeedometerMetric with the given configuration.
     * @param config the configuration for this speedometer
     */
    public PlatformSpeedometerMetric(@NonNull final SpeedometerMetric.Config config) {
        this(config, Time.getCurrent());
    }

    /**
     * This constructor should only be used for testing.
     */
    @SuppressWarnings("removal")
    public PlatformSpeedometerMetric(final SpeedometerMetric.Config config, final Time time) {
        super(config, config.getHalfLife());
        this.speedometer = new StatsSpeedometer(halfLife, time);
    }

    /**
     * {@inheritDoc}
     */
    @NonNull
    @SuppressWarnings("removal")
    @Override
    public StatsBuffered getStatsBuffered() {
        return speedometer;
    }

    /**
     * {@inheritDoc}
     */
    @SuppressWarnings("removal")
    @Override
    public void update(final double value) {
        speedometer.update(value);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void cycle() {
        update(1);
    }

    /**
     * {@inheritDoc}
     */
    @SuppressWarnings("removal")
    @Override
    public double get() {
        return speedometer.getCyclesPerSecond();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String toString() {
        return new ToStringBuilder(this)
                .appendSuper(super.toString())
                .append("halfLife", halfLife)
                .append("value", get())
                .toString();
    }
}