io.netty.handler.stream

Class ChunkedNioFile

java.lang.Object

io.netty.handler.stream.ChunkedNioFile

All Implemented Interfaces:

ChunkedByteInput, ChunkedInput<ByteBuf>

public class ChunkedNioFile
extends Object
implements ChunkedByteInput

A ChunkedByteInput that fetches data from a file chunk by chunk using NIO FileChannel.

If your operating system supports zero-copy file transfer such as sendfile(), you might want to use FileRegion instead.

Constructor Summary

Constructors

Constructor and Description
ChunkedNioFile(File in) Creates a new instance that fetches data from the specified file.
ChunkedNioFile(FileChannel in) Creates a new instance that fetches data from the specified file.
ChunkedNioFile(FileChannel in, int chunkSize) Creates a new instance that fetches data from the specified file.
ChunkedNioFile(FileChannel in, long offset, long length, int chunkSize) Creates a new instance that fetches data from the specified file.
ChunkedNioFile(File in, int chunkSize) Creates a new instance that fetches data from the specified file.

Method Summary

Methods

Modifier and Type	Method and Description
void	close() Releases the resources associated with the input.
long	currentOffset() Returns the offset in the file where the transfer is happening currently.
long	endOffset() Returns the offset in the file where the transfer will end.
boolean	isEndOfInput() Return true if and only if there is no data left in the stream and the stream has reached at its end.
boolean	readChunk(ByteBuf buffer) Fetches a chunked data from the stream.
long	startOffset() Returns the offset in the file where the transfer began.

Methods inherited from class java.lang.Object

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

Constructor Detail

ChunkedNioFile

public ChunkedNioFile(File in)
               throws IOException

Creates a new instance that fetches data from the specified file.

Throws:

IOException

ChunkedNioFile

public ChunkedNioFile(File in,
              int chunkSize)
               throws IOException

Creates a new instance that fetches data from the specified file.

Parameters:

chunkSize - the number of bytes to fetch on each readChunk(ByteBuf) call

Throws:

IOException

ChunkedNioFile

public ChunkedNioFile(FileChannel in)
               throws IOException

Creates a new instance that fetches data from the specified file.

Throws:

IOException

ChunkedNioFile

public ChunkedNioFile(FileChannel in,
              int chunkSize)
               throws IOException

Creates a new instance that fetches data from the specified file.

Parameters:

chunkSize - the number of bytes to fetch on each readChunk(ByteBuf) call

Throws:

IOException

ChunkedNioFile

public ChunkedNioFile(FileChannel in,
              long offset,
              long length,
              int chunkSize)
               throws IOException

Creates a new instance that fetches data from the specified file.

Parameters:

offset - the offset of the file where the transfer begins

length - the number of bytes to transfer

chunkSize - the number of bytes to fetch on each readChunk(ByteBuf) call

Throws:

IOException

Method Detail

startOffset

public long startOffset()

Returns the offset in the file where the transfer began.

endOffset

public long endOffset()

Returns the offset in the file where the transfer will end.

currentOffset

public long currentOffset()

Returns the offset in the file where the transfer is happening currently.

isEndOfInput

public boolean isEndOfInput()
                     throws Exception

Description copied from interface: ChunkedInput

Return true if and only if there is no data left in the stream and the stream has reached at its end.

Specified by:

isEndOfInput in interface ChunkedInput<ByteBuf>

Throws:

Exception

close

public void close()
           throws Exception

Description copied from interface: ChunkedInput

Releases the resources associated with the input.

Specified by:

close in interface ChunkedInput<ByteBuf>

Throws:

Exception

readChunk

public boolean readChunk(ByteBuf buffer)
                  throws Exception

Description copied from interface: ChunkedInput

Fetches a chunked data from the stream. The chunk is then transfered to the given buffer. Once this method returns the last chunk and thus the stream has reached at its end, any subsequent ChunkedInput.isEndOfInput() call must return false.

Specified by:

readChunk in interface ChunkedInput<ByteBuf>

Parameters:

buffer - read the next chunk and transfer it to the given buffer

Throws:

Exception