/* * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code 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 General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package jdk.test.failurehandler; public final class Stopwatch { protected boolean isResultAvailable; protected boolean isRunning; private long startTimeNs; private long stopTimeNs; public Stopwatch() { isResultAvailable = false; } /** * Starts measuring time. */ public void start() { startTimeNs = System.nanoTime(); isRunning = true; } /** * Stops measuring time. */ public void stop() { if (!isRunning) { throw new IllegalStateException(" hasn't been started"); } stopTimeNs = System.nanoTime(); isRunning = false; isResultAvailable = true; } /** * @return time in nanoseconds measured between * calls of {@link #start()} and {@link #stop()} methods. * * @throws IllegalStateException if called without preceding * {@link #start()} {@link #stop()} method */ public long getElapsedTimeNs() { if (isRunning) { throw new IllegalStateException("hasn't been stopped"); } if (!isResultAvailable) { throw new IllegalStateException("was not run"); } return stopTimeNs - startTimeNs; } }