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/*
* Copyright (c) 2001, 2020, 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.
*/
/* @test
@bug 4452020 4629048 4638365 4869859
* @summary Test FileChannel scattering reads
* @run main/othervm ScatteringRead
*/
import java.nio.channels.*;
import java.nio.*;
import java.io.*;
public class ScatteringRead {
private static final int NUM_BUFFERS = 3;
private static final int BUFFER_CAP = 3;
private static final int BIG_BUFFER_CAP = Integer.MAX_VALUE / 3 + 10;
public static void main(String[] args) throws Exception {
test1(); // for bug 4452020
test2(); // for bug 4629048
System.gc();
}
private static void test1() throws Exception {
ByteBuffer dstBuffers[] = new ByteBuffer[NUM_BUFFERS];
for (int i=0; i<NUM_BUFFERS; i++)
dstBuffers[i] = ByteBuffer.allocateDirect(BUFFER_CAP);
File blah = File.createTempFile("blah1", null);
blah.deleteOnExit();
createTestFile(blah);
FileInputStream fis = new FileInputStream(blah);
FileChannel fc = fis.getChannel();
byte expectedResult = -128;
for (int k=0; k<20; k++) {
long bytesRead = fc.read(dstBuffers);
for (int i=0; i<NUM_BUFFERS; i++) {
for (int j=0; j<BUFFER_CAP; j++) {
byte b = dstBuffers[i].get(j);
if (b != expectedResult++)
throw new RuntimeException("Test failed");
}
dstBuffers[i].flip();
}
}
fis.close();
}
private static void createTestFile(File blah) throws Exception {
FileOutputStream fos = new FileOutputStream(blah);
for(int i=-128; i<128; i++)
fos.write((byte)i);
fos.flush();
fos.close();
}
private static void test2() throws Exception {
ByteBuffer dstBuffers[] = new ByteBuffer[2];
for (int i=0; i<2; i++)
dstBuffers[i] = ByteBuffer.allocateDirect(10);
File blah = File.createTempFile("blah2", null);
blah.deleteOnExit();
FileOutputStream fos = new FileOutputStream(blah);
for(int i=0; i<15; i++)
fos.write((byte)92);
fos.flush();
fos.close();
FileInputStream fis = new FileInputStream(blah);
FileChannel fc = fis.getChannel();
long bytesRead = fc.read(dstBuffers);
if (dstBuffers[1].limit() != 10)
throw new Exception("Scattering read changed buf limit.");
fis.close();
}
}
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