/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* Exercise Object.wait(), comparing results against wall clock time.
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*/
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public class Main {
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/* delays, in milliseconds */
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private final static long[] DELAYS = {
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200, 500, 1000, 2000, 3500, 8000
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};
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public static void main(String[] args) {
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boolean timing = (args.length >= 1) && args[0].equals("--timing");
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doit(timing);
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}
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public static void doit(boolean timing) {
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Object sleepy = new Object();
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long start, end;
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synchronized (sleepy) {
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try {
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sleepy.wait(-500);
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System.out.println("HEY: didn't throw on negative arg");
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} catch (IllegalArgumentException iae) {
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System.out.println("Caught expected exception on neg arg");
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} catch (InterruptedException ie) {
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ie.printStackTrace(System.out);
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}
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for (long delay : DELAYS) {
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System.out.println("Waiting for " + delay + "ms...");
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start = System.currentTimeMillis();
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try {
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sleepy.wait(delay);
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} catch (InterruptedException ie) {
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ie.printStackTrace(System.out);
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}
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end = System.currentTimeMillis();
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long elapsed = end - start;
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boolean showTime = timing;
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if (! timing) {
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long epsilon = delay / 10;
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if (epsilon > 50) {
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epsilon = 50;
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}
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long min = delay - epsilon;
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long max = delay + epsilon;
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if (elapsed < min) {
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System.out.println(" Elapsed time was too short");
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showTime = true;
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} else if (elapsed > max) {
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System.out.println(" Elapsed time was too long: "
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+ "elapsed=" + elapsed + " max=" + max);
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showTime = true;
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}
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}
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if (showTime) {
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System.out.println(" Wall clock elapsed "
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+ elapsed + "ms");
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}
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}
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}
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}
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}
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