1 /*
   2  * Copyright (C) 2019 JetBrains s.r.o.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 8220231
  27  * @summary Cache HarfBuzz face object for same font's text layout calls
  28  * @comment Test layout operations for the same font performed simultaneously
  29  *          from multiple threads
  30  */
  31 
  32 import java.awt.Font;
  33 import java.awt.font.FontRenderContext;
  34 import java.awt.font.GlyphVector;
  35 import java.util.ArrayList;
  36 import java.util.List;
  37 import java.util.concurrent.CyclicBarrier;
  38 import java.util.concurrent.atomic.AtomicReference;
  39 
  40 public class FontLayoutStressTest {
  41     private static final int NUMBER_OF_THREADS =
  42             Runtime.getRuntime().availableProcessors() * 2;
  43     private static final long TIME_TO_RUN_NS = 1_000_000_000; // 1 second
  44     private static final Font FONT = new Font(Font.SERIF, Font.PLAIN, 12);
  45     private static final FontRenderContext FRC = new FontRenderContext(null,
  46             false, false);
  47     private static final char[] TEXT = "Lorem ipsum dolor sit amet, ..."
  48             .toCharArray();
  49 
  50     private static double doLayout() {
  51         GlyphVector gv = FONT.layoutGlyphVector(FRC, TEXT, 0, TEXT.length,
  52                 Font.LAYOUT_LEFT_TO_RIGHT);
  53         return gv.getGlyphPosition(gv.getNumGlyphs()).getX();
  54     }
  55 
  56     public static void main(String[] args) throws Throwable {
  57         double expectedWidth = doLayout();
  58         AtomicReference<Throwable> throwableRef = new AtomicReference<>();
  59         CyclicBarrier barrier = new CyclicBarrier(NUMBER_OF_THREADS);
  60         List<Thread> threads = new ArrayList<>();
  61         for (int i = 0; i < NUMBER_OF_THREADS; i++) {
  62             Thread thread = new Thread(() -> {
  63                 try {
  64                     barrier.await();
  65                     long timeToStop = System.nanoTime() + TIME_TO_RUN_NS;
  66                     while (System.nanoTime() < timeToStop) {
  67                         double width = doLayout();
  68                         if (width != expectedWidth) {
  69                             throw new RuntimeException(
  70                                     "Unexpected layout result");
  71                         }
  72                     }
  73                 } catch (Throwable e) {
  74                     throwableRef.set(e);
  75                 }
  76             });
  77             threads.add(thread);
  78             thread.start();
  79         }
  80         for (Thread thread : threads) {
  81             thread.join();
  82         }
  83         Throwable throwable = throwableRef.get();
  84         if (throwable != null) {
  85             throw throwable;
  86         }
  87     }
  88 }