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/*
* 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;
}
}
}
}
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