OpenJDK 27 · sun.nio.ch.FileChannelImpl · APIdia, the JavaDoc alternative

Modifier and Type	Class and Description
private static class	FileChannelImpl.Closer
private static class	FileChannelImpl.DefaultUnmapper
private static class	FileChannelImpl.SyncUnmapper
private abstract static class	FileChannelImpl.Unmapper

Modifier and Type	Field and Description
private final int	alignment
private final Cleaner.Cleanable	closer
private final boolean	direct
private final FileDescriptor	fd
private static final JavaIOFileDescriptorAccess	fdAccess
private volatile FileLockTable	fileLockTable
private static boolean	jfrTracing
private static final int	MAP_INVALID
private static final int	MAP_PV
private static final int	MAP_RO
private static final int	MAP_RW
private static final long	MAPPED_TRANSFER_SIZE
private static final long	MAPPED_TRANSFER_THRESHOLD
private static final FileDispatcher	nd
private final Closeable	parent
private final String	path
private final Object	positionLock
private final boolean	readable
private final boolean	sync
private final NativeThreadSet	threads
private static final int	TRANSFER_SIZE
private static volatile boolean	transferFromDirectNotSupported
private static volatile boolean	transferToDirectNotSupported
private volatile boolean	uninterruptible
private final boolean	writable

Access	Constructor and Description
private	FileChannelImpl(FileDescriptor fd, String path, boolean readable, boolean writable, boolean sync, boolean direct, Closeable parent)

Method Summary

Modifier and Type	Method and Description
private void	afterTransfer(boolean completed, int ti) Marks the end of a transfer to or from this channel.
pack-priv int	available() Returns an estimate of the number of remaining bytes that can be read from this channel without blocking.
private int	beforeTransfer() Marks the beginning of a transfer to or from this channel.
private void	beginBlocking()
private void	checkMode(FileChannel.MapMode mode, int prot, boolean isSync)
private void	endBlocking(boolean completed)
private void	ensureOpen()
private FileLockTable	fileLockTable()
public void	force(boolean metaData) Implements abstract java.nio.channels.FileChannel.force. Forces any updates to this channel's file to be written to the storage device that contains it.
public static VM.BufferPool	getMappedBufferPool() Invoked by sun.management.ManagementFactoryHelper to create the management interface for mapped buffers.
public static VM.BufferPool	getSyncMappedBufferPool() Invoked by sun.management.ManagementFactoryHelper to create the management interface for sync mapped buffers.
protected void	implCloseChannel() Implements abstract java.nio.channels.spi.AbstractInterruptibleChannel.implCloseChannel. Closes this channel.
private void	implForce(boolean metaData)
private int	implRead(ByteBuffer dst)
private long	implRead(ByteBuffer[] dsts, int offset, int length)
private int	implRead(ByteBuffer dst, long position)
private int	implWrite(ByteBuffer src)
private long	implWrite(ByteBuffer[] srcs, int offset, int length)
private int	implWrite(ByteBuffer src, long position)
pack-priv boolean	isOther() Tells whether the channel represents something other than a regular file, directory, or symbolic link.
private boolean	isSync(FileChannel.MapMode mode)
public FileLock	lock(long position, long size, boolean shared) Implements abstract java.nio.channels.FileChannel.lock. Acquires a lock on the given region of this channel's file.
public MappedByteBuffer	map(FileChannel.MapMode mode, long position, long size) Implements abstract java.nio.channels.FileChannel.map. Maps a region of this channel's file directly into memory.
public MemorySegment	map(FileChannel.MapMode mode, long offset, long size, Arena arena) Overrides java.nio.channels.FileChannel.map. Maps a region of this channel's file into a new mapped memory segment, with the given offset, size and arena.
private FileChannelImpl.Unmapper	mapInternal(FileChannel.MapMode mode, long position, long size, int prot, boolean isSync)
public static FileChannel	open(FileDescriptor fd, String path, boolean readable, boolean writable, boolean sync, boolean direct, Closeable parent)
public long	position() Implements abstract java.nio.channels.FileChannel.position. Implements java.nio.channels.SeekableByteChannel.position. Returns this channel's file position.
public FileChannel	position(long newPosition) Implements abstract java.nio.channels.FileChannel.position. Implements java.nio.channels.SeekableByteChannel.position. Sets this channel's file position.
public int	read(ByteBuffer dst) Implements abstract java.nio.channels.FileChannel.read. Implements java.nio.channels.SeekableByteChannel.read, java.nio.channels.ReadableByteChannel.read. Reads a sequence of bytes from this channel into the given buffer.
public long	read(ByteBuffer[] dsts, int offset, int length) Implements abstract java.nio.channels.FileChannel.read. Implements java.nio.channels.ScatteringByteChannel.read. Reads a sequence of bytes from this channel into a subsequence of the given buffers.
public int	read(ByteBuffer dst, long position) Implements abstract java.nio.channels.FileChannel.read. Reads a sequence of bytes from this channel into the given buffer, starting at the given file position.
private int	readInternal(ByteBuffer dst, long position)
pack-priv void	release(FileLockImpl fli)
public void	setUninterruptible()
public long	size() Implements abstract java.nio.channels.FileChannel.size. Implements java.nio.channels.SeekableByteChannel.size. Returns the current size of this channel's file.
private int	toProt(FileChannel.MapMode mode)
private int	traceImplRead(ByteBuffer dst)
private long	traceImplRead(ByteBuffer[] dsts, int offset, int length)
private int	traceImplRead(ByteBuffer dst, long position)
private int	traceImplWrite(ByteBuffer src)
private long	traceImplWrite(ByteBuffer[] srcs, int offset, int length)
private int	traceImplWrite(ByteBuffer src, long position)
private AsynchronousCloseException	transferFailed(ClosedChannelException cce, Channel other) Invoked when ClosedChannelException is thrown during a transfer.
public long	transferFrom(ReadableByteChannel src, long position, long count) Implements abstract java.nio.channels.FileChannel.transferFrom. Transfers bytes into this channel's file from the given readable byte channel.
private long	transferFromArbitraryChannel(ReadableByteChannel src, long position, long count) Transfers bytes into this channel's file from the given channel.
private long	transferFromDirect(FileChannelImpl src, long position, long count) Transfers bytes into this channel's file from the given channel's file.
private long	transferFromFileChannel(FileChannelImpl src, long position, long count) Transfers bytes into this channel's file from the given channel's file.
private long	transferFromFileDescriptor(FileDescriptor srcFD, long position, long count) Transfers bytes into this channel's file from the resource that the given file descriptor is connected to.
public long	transferTo(long position, long count, WritableByteChannel target) Implements abstract java.nio.channels.FileChannel.transferTo. Transfers bytes from this channel's file to the given writable byte channel.
private long	transferToArbitraryChannel(long position, long count, WritableByteChannel target) Transfers bytes from channel's file to the given channel.
private long	Returns: the number of bytes transferred, UNSUPPORTED_CASE if this transfer cannot be done directly, or UNSUPPORTED if there is no direct support transferToDirect(long position, int count, WritableByteChannel target) Transfers bytes from this channel's file to the given channel's file or socket.
private long	transferToDirectInternal(long position, int count, WritableByteChannel target) Transfers bytes from this channel's file from the given channel's file.
private long	transferToFileChannel(long position, int count, FileChannelImpl target) Transfers bytes from this channel's file to the given channel's file.
private long	transferToFileDescriptor(long position, int count, FileDescriptor targetFD) Transfers bytes from this channel's file to the resource that the given file descriptor is connected to.
private long	transferToSocketChannel(long position, int count, SocketChannelImpl target) Transfers bytes from this channel's file to the given channel's socket.
private long	transferToTrustedChannel(long position, long count, WritableByteChannel target) Transfers bytes from channel's file to the given channel.
public FileChannel	truncate(long newSize) Implements abstract java.nio.channels.FileChannel.truncate. Implements java.nio.channels.SeekableByteChannel.truncate. Truncates this channel's file to the given size.
public FileLock	tryLock(long position, long size, boolean shared) Implements abstract java.nio.channels.FileChannel.tryLock. Attempts to acquire a lock on the given region of this channel's file.
private static void	unmap(MappedByteBuffer bb)
public int	write(ByteBuffer src) Implements abstract java.nio.channels.FileChannel.write. Implements java.nio.channels.SeekableByteChannel.write, java.nio.channels.WritableByteChannel.write. Writes a sequence of bytes to this channel from the given buffer.
public long	write(ByteBuffer[] srcs, int offset, int length) Implements abstract java.nio.channels.FileChannel.write. Implements java.nio.channels.GatheringByteChannel.write. Writes a sequence of bytes to this channel from a subsequence of the given buffers.
public int	write(ByteBuffer src, long position) Implements abstract java.nio.channels.FileChannel.write. Writes a sequence of bytes to this channel from the given buffer, starting at the given file position.
private int	writeInternal(ByteBuffer src, long position)

Inherited from java.nio.channels.FileChannel:: lock open open read tryLock write

public Class FileChannelImpl

Nested and Inner Type Summary

Field Summary

Constructor Summary

Method Summary