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jPOS is an ISO-8583 based financial transaction library/framework that can be customized and extended in order to implement financial interchanges.

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/*
 * jPOS Project [http://jpos.org]
 * Copyright (C) 2000-2016 Alejandro P. Revilla
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see .
 */

package org.jpos.util;

import java.util.concurrent.TimeUnit;

public class StopWatch {
    long end;
    public StopWatch (long period, TimeUnit unit) {
        end = System.currentTimeMillis() + TimeUnit.MILLISECONDS.convert(period, unit);
    }
    public StopWatch (long periodInMillis) {
        this (periodInMillis, TimeUnit.MILLISECONDS);
    }
    public void finish() {
        long now = System.currentTimeMillis();
        if (end > now) {
            try {
                Thread.sleep(end - now);
            } catch (InterruptedException ignored) { }
        }
    }
    public boolean isFinished() {
        return System.currentTimeMillis() >= end;
    }
}