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Personal library for Java development. Deployed on OSSRH for Apache Maven.

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/*
 License:

 blueprint-sdk is licensed under the terms of Eclipse Public License(EPL) v1.0
 (http://www.eclipse.org/legal/epl-v10.html)


 Distribution:

 Maven Central - https://search.maven.org/artifact/io.github.lempel/blueprint-sdk
 MVN Repository - https://mvnrepository.com/artifact/io.github.lempel/blueprint-sdk
 */

package blueprint.sdk.util;

/**
 * Statistics Utility

 * Simple yet...

 *
 * @author [email protected]
 * @since 2009. 2. 25.
 */
@SuppressWarnings("WeakerAccess")
public class Statistics {
    private long sum = 0;
    private long count = 0;

    public void add(final long amount) {
        synchronized (this) {
            sum += amount;
            count++;
        }
    }

    /**
     * @return current mean
     */
    public long mean() {
        long result;
        synchronized (this) {
            if (sum == 0) {
                result = 0;
            } else {
                result = sum / count;
            }
        }
        return result;
    }

    /**
     * @return current sum
     */
    public long sum() {
        synchronized (this) {
            return sum;
        }
    }

    /**
     * @return current count
     */
    public long count() {
        synchronized (this) {
            return count;
        }
    }

    public void reset() {
        synchronized (this) {
            sum = 0;
            count = 0;
        }
    }
}