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/*
* Copyright (c) 2006, 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 6322678
* @summary Test for making sure that FIS/FOS.finalize() will
* not disturb the FD that is still in use.
*/
import java.io.*;
import java.nio.*;
import java.nio.channels.*;
public class Finalize {
static byte data[] = new byte[] {48, 49, 50, 51, 52, 53, 54, 55, 56, 57,};
static String inFileName = "fd-in-test.txt";
static String outFileName = "fd-out-test.txt";
static File inFile;
static File outFile;
public static void main(String[] args)
throws Exception {
Thread.sleep(5000);
inFile= new File(System.getProperty("test.dir", "."),
inFileName);
inFile.createNewFile();
inFile.deleteOnExit();
writeToInFile();
doFileInputStream();
outFile = new File(System.getProperty("test.dir", "."),
outFileName);
outFile.createNewFile();
outFile.deleteOnExit();
doFileOutputStream();
doRandomAccessFile();
doFileChannel();
}
private static void doFileInputStream() throws Exception {
/* Create initial FIS for file */
FileInputStream fis1 = new FileInputStream(inFile);
/* Get the FileDescriptor from the fis */
FileDescriptor fd = fis1.getFD();
/*
* Create a new FIS based on the existing FD
* (so the two FIS's share the same native fd)
*/
FileInputStream fis2 = new FileInputStream(fd);
/* allow fis1 to be gc'ed */
fis1 = null;
int ret = 0;
/* encourage gc */
System.gc();
Thread.sleep(200);
while((ret = fis2.read()) != -1 ) {
/*
* read from fis2 - when fis1 is gc'ed and finalizer is run,
* read should not fail
*/
System.out.println("read from fis2:" + ret);
}
fis2.close();
}
private static void writeToInFile() throws IOException {
FileOutputStream out = new FileOutputStream(inFile);
out.write(data);
out.close();
}
private static void doFileOutputStream()
throws Exception {
System.out.println("--------FileOutputStream Test Started----------");
/*Create initial FIS for file */
FileOutputStream fos1 = new FileOutputStream(outFile);
/* Get the FileDescriptor from the fos */
FileDescriptor fd = fos1.getFD();
FileOutputStream fos2 = new FileOutputStream(fd);
/* allow fos1 to be gc'ed */
fos1 = null;
/* encourage gc */
System.gc();
Thread.sleep(200);
/*
* write to fos2 - when fos1 is gc'ed and finalizer is run,
* write to fos2 should not fail
*/
fos2.write(data);
System.out.println("wrote:" + data.length + " bytes to fos2");
fos2.close();
System.out.println("--------FileOutputStream Test Over----------");
System.out.println();
}
private static void doRandomAccessFile()
throws Exception {
System.out.println("--------RandomAccessFile Read Test Started----------");
// Create initial FIS for file
RandomAccessFile raf = new RandomAccessFile(inFile, "r");
/* Get the FileDescriptor from the fis */
FileDescriptor fd = raf.getFD();
/* Create a new FIS based on the existing FD
* (so the two FIS's share the same native fd)
*/
FileInputStream fis = new FileInputStream(fd);
/* allow fis to be gc'ed */
fis = null;
int ret = 0;
/* encourage gc */
System.gc();
Thread.sleep(50);
/*
* read from raf - when fis is gc'ed and finalizer is run,
* read from raf should not fail
*/
while((ret = raf.read()) != -1 ) {
System.out.println("read from raf:" + ret);
}
raf.close();
Thread.sleep(200);
System.out.println("--------RandomAccessFile Write Test Started----------");
System.out.println();
raf = new RandomAccessFile(outFile, "rw");
fd = raf.getFD();
FileOutputStream fos = new FileOutputStream(fd);
/* allow fos to be gc'ed */
fos = null;
/* encourage gc */
System.gc();
Thread.sleep(200);
/*
* write to raf - when fos is gc'ed and finalizer is run,
* write to raf should not fail
*/
raf.write(data);
System.out.println("wrote:" + data.length + " bytes to raf");
raf.close();
System.out.println("--------RandomAccessFile Write Test Over----------");
System.out.println();
}
private static void doFileChannel() throws Exception {
System.out.println("--------FileChannel Read Test Started----------");
System.out.println();
FileInputStream fis1 = new FileInputStream(inFile);
/* Get the FileDescriptor from the fis */
FileDescriptor fd = fis1.getFD();
/* Create a new FIS based on the existing FD
* (so the two FIS's share the same native fd)
*/
FileInputStream fis2 = new FileInputStream(fd);
FileChannel fc2 = fis2.getChannel();
/**
* Encourage the GC
*/
fis1 = null;
System.gc();
Thread.sleep(200);
int ret = 1;
ByteBuffer bb = ByteBuffer.allocateDirect(1);
ret = fc2.read(bb);
System.out.println("read " + ret + " bytes from fc2:");
fc2.close();
System.out.println("--------FileChannel Read Test Over----------");
System.out.println();
System.out.println("--------FileChannel Write Test Started----------");
FileOutputStream fos1 = new FileOutputStream(outFile);
/* Get the FileDescriptor from the fos */
fd = fos1.getFD();
FileOutputStream fos2 = new FileOutputStream(fd);
fc2 = fos2.getChannel();
/**
* Encourage the GC
*/
fos1 = null;
System.gc();
Thread.sleep(200);
/*
* write to fc2 - when fos1 is gc'ed and finalizer is run,
* write to fc2 should not fail
*/
bb = ByteBuffer.allocateDirect(data.length)
.put(data)
.flip();
ret = fc2.write(bb);
System.out.println("Wrote:" + ret + " bytes to fc2");
fc2.close();
System.out.println("--------Channel Write Test Over----------");
}
}
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