| /* |
| * Copyright (c) 2014 Google Inc. 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. |
| */ |
| |
| /* |
| * @test |
| * @ignore This test has huge memory requirements |
| * @run main/timeout=1800/othervm -Xmx8g MaxCapacity |
| * @bug 8055949 |
| * @summary Check that we can write (almost) Integer.MAX_VALUE bytes |
| * to a ByteArrayOutputStream. |
| * @author Martin Buchholz |
| */ |
| import java.io.ByteArrayOutputStream; |
| |
| public class MaxCapacity { |
| public static void main(String[] args) { |
| long maxHeap = Runtime.getRuntime().maxMemory(); |
| if (maxHeap < 3L * Integer.MAX_VALUE) { |
| System.out.printf("Skipping test; max memory %sM too small%n", |
| maxHeap/(1024*1024)); |
| return; |
| } |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| for (long n = 0; ; n++) { |
| try { |
| baos.write((byte)'x'); |
| } catch (Throwable t) { |
| // check data integrity while we're here |
| byte[] bytes = baos.toByteArray(); |
| if (bytes.length != n) |
| throw new AssertionError("wrong length"); |
| if (bytes[0] != 'x' || |
| bytes[bytes.length - 1] != 'x') |
| throw new AssertionError("wrong contents"); |
| |
| long gap = Integer.MAX_VALUE - n; |
| System.out.printf("gap=%dM %d%n", gap/(1024*1024), gap); |
| if (gap > 1024) |
| throw t; |
| // t.printStackTrace(); |
| break; |
| } |
| } |
| } |
| } |