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Use Lucene's unmapping code inside AccessController.doPrivileged() for unmapping mapped byte buffers.

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git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1713350 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Uwe Schindler 2015-11-09 09:06:01 +00:00
parent 77a586d4a2
commit 8c3cd70589
1 changed files with 25 additions and 22 deletions
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47
src/java/org/apache/poi/poifs/nio/FileBackedDataSource.java
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@ -22,21 +22,27 @@ import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.io.RandomAccessFile;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.FileChannel;
import java.nio.channels.WritableByteChannel;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.util.IOUtils;
import org.apache.poi.util.POILogFactory;
import org.apache.poi.util.POILogger;
import org.apache.poi.util.SuppressForbidden;
/**
* A POIFS {@link DataSource} backed by a File
*/
public class FileBackedDataSource extends DataSource {
private final static POILogger logger = POILogFactory.getLogger( FileBackedDataSource.class );
private FileChannel channel;
private boolean writable;
// remember file base, which needs to be closed too
@ -155,26 +161,23 @@ public class FileBackedDataSource extends DataSource {
// need to use reflection to avoid depending on the sun.nio internal API
// unfortunately this might break silently with newer/other Java implementations,
// but we at least have unit-tests which will indicate this when run on Windows
private static void unmap(ByteBuffer bb) {
Class<?> fcClass = bb.getClass();
try {
// invoke bb.cleaner().clean(), but do not depend on sun.nio
// interfaces
Method cleanerMethod = fcClass.getDeclaredMethod("cleaner");
cleanerMethod.setAccessible(true);
Object cleaner = cleanerMethod.invoke(bb);
Method cleanMethod = cleaner.getClass().getDeclaredMethod("clean");
cleanMethod.invoke(cleaner);
} catch (NoSuchMethodException e) {
// e.printStackTrace();
} catch (SecurityException e) {
// e.printStackTrace();
} catch (IllegalAccessException e) {
// e.printStackTrace();
} catch (IllegalArgumentException e) {
// e.printStackTrace();
} catch (InvocationTargetException e) {
// e.printStackTrace();
}
private static void unmap(final ByteBuffer buffer) {
AccessController.doPrivileged(new PrivilegedAction<Void>() {
@Override
@SuppressForbidden("Java 9 Jigsaw whitelists access to sun.misc.Cleaner, so setAccessible works")
public Void run() {
try {
final Method getCleanerMethod = buffer.getClass().getMethod("cleaner");
getCleanerMethod.setAccessible(true);
final Object cleaner = getCleanerMethod.invoke(buffer);
if (cleaner != null) {
cleaner.getClass().getMethod("clean").invoke(cleaner);
}
} catch (Exception e) {
logger.log(POILogger.WARN, "Unable to unmap memory mapped ByteBuffer.", e);
}
return null; // Void
}
});
}
}