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/OpenJDK 21

Class ExtendedMapMode

java.lang.Object
jdk.nio.mapmode.ExtendedMapMode
public class ExtendedMapMode extends Object
JDK-specific map modes.
Since:
14
See Also:

Field Summary

Modifier and Type Field Description
static final FileChannel.MapMode READ_ONLY_SYNC
File mapping mode for a read-only mapping of a file backed by non-volatile RAM.
static final FileChannel.MapMode READ_WRITE_SYNC
File mapping mode for a read-write mapping of a file backed by non-volatile RAM.

Method Summary

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

READ_ONLY_SYNC

public static final FileChannel.MapMode READ_ONLY_SYNC
File mapping mode for a read-only mapping of a file backed by non-volatile RAM.

The map method throws UnsupportedOperationException when this map mode is used on an implementation that does not support it.

Implementation Note:
On Linux, the MAP_SYNC and MAP_SHARED_VALIDATE flags are specified to mmap when mapping the file into memory.

READ_WRITE_SYNC

public static final FileChannel.MapMode READ_WRITE_SYNC
File mapping mode for a read-write mapping of a file backed by non-volatile RAM. force operations on a buffer created with this mode will be performed using cache line writeback rather than proceeding via a file device flush.

The map method throws UnsupportedOperationException when this map mode is used on an implementation that does not support it.

Implementation Note:
On Linux, the MAP_SYNC and MAP_SHARED_VALIDATE flags are specified to mmap when mapping the file into memory.

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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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https://docs.oracle.com/en/java/javase/21/docs/api/jdk.nio.mapmode/jdk/nio/mapmode/ExtendedMapMode.html