/*
* The MIT License
*
* Copyright (c) 2011 The Broad Institute
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package picard.util;
import picard.PicardException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
/**
* Work-around for the following bug
* http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6503430
*
* Call the method in the main thread before launching threads that do memory-mapping.
* @author alecw@broadinstitute.org
*/
public class FileChannelJDKBugWorkAround {
private static boolean alreadyCalled = false;
public static byte doBugWorkAround() {
if (alreadyCalled) return 0;
try {
File tmpFile = File.createTempFile("ignore-me.", ".bug-work-around");
FileWriter writer = new FileWriter(tmpFile);
writer.write("Hi, Mom!");
writer.close();
FileInputStream is = new FileInputStream(tmpFile);
ByteBuffer buf = is.getChannel().map(FileChannel.MapMode.READ_ONLY, 0, tmpFile.length());
is.close();
byte ret = buf.get();
tmpFile.delete();
alreadyCalled = true;
return ret;
} catch (IOException e) {
throw new PicardException("IOException", e);
}
}
}