java.nio.channels
Class FileChannel
- ByteChannel, Channel, Closeable, GatheringByteChannel, InterruptibleChannel, ReadableByteChannel, ScatteringByteChannel, WritableByteChannel
abstract void | force(boolean metaData)- msync with the disk
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protected abstract void | implCloseChannel()- Closes the channel.
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FileLock | lock()- Creates a file lock for the whole associated file.
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abstract FileLock | lock(long position, long size, boolean shared)- Creates a file lock for a region of the associated file.
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abstract MappedByteBuffer | map(FileChannel.MapMode mode, long position, long size)- Maps the file into the memory.
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abstract long | position()- Returns the current position on the file.
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abstract FileChannel | position(long newPosition)- Sets the position of the channel on the assoziated file.
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abstract int | read(ByteBuffer dst)- Reads data from the channel.
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abstract int | read(ByteBuffer dst, long position)- Reads data from the channel.
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long | read(ByteBuffer[] dsts)- Reads data from the channel.
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abstract long | read(ByteBuffer[] dsts, int offset, int length)- Reads data from the channel.
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abstract long | size()- Return the size of the file thus far
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abstract long | transferFrom(ReadableByteChannel src, long position, long count)- Transfers bytes from the given readable channel into this channel.
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abstract long | transferTo(long position, long count, WritableByteChannel target)- Transfers bytes from this channel's file to the given writable byte
channel.
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abstract FileChannel | truncate(long size)- Truncates the channel's file at
size.
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FileLock | tryLock()- Tries to aqquire alock on the whole associated file.
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abstract FileLock | tryLock(long position, long size, boolean shared)- Tries to aqquire a lock on a region of the associated file.
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abstract int | write(ByteBuffer src)- Writes data to the channel.
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abstract int | write(ByteBuffer srcs, long position)- Writes data to the channel.
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long | write(ByteBuffer[] srcs)- Writes data to the channel.
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abstract long | write(ByteBuffer[] srcs, int offset, int length)- Writes data to the channel.
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clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
FileChannel
protected FileChannel()
Initializes the channel.
force
public abstract void force(boolean metaData)
throws IOException msync with the disk
lock
public abstract FileLock lock(long position,
long size,
boolean shared)
throws IOException Creates a file lock for a region of the associated file.
position
public abstract long position()
throws IOException Returns the current position on the file.
size
public abstract long size()
throws IOException Return the size of the file thus far
tryLock
public final FileLock tryLock()
throws IOException Tries to aqquire alock on the whole associated file.
IOException - If an I/O error occurs.OverlappingFileLockException - If a lock that overlaps the
requested region is already held by this Java virtual machine, or if
another thread is already blocked in this method and is attempting to lock
an overlapping region.
tryLock
public abstract FileLock tryLock(long position,
long size,
boolean shared)
throws IOException Tries to aqquire a lock on a region of the associated file.
IllegalArgumentException - If the preconditions on the parameters
do not hold.IOException - If an I/O error occurs.OverlappingFileLockException - If a lock that overlaps the
requested region is already held by this Java virtual machine, or if
another thread is already blocked in this method and is attempting to lock
an overlapping region.
FileChannel.java --
Copyright (C) 2002 Free Software Foundation, Inc.
This file is part of GNU Classpath.
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it under the terms of the GNU General Public License as published by
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