io.netty.handler.stream

Class ChunkedNioFile

java.lang.Object

io.netty.handler.stream.ChunkedNioFile

All Implemented Interfaces:

ChunkedInput<ByteBuf>

public class ChunkedNioFile
extends java.lang.Object
implements ChunkedInput<ByteBuf>

A ChunkedInput 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(java.io.File in) Creates a new instance that fetches data from the specified file.
ChunkedNioFile(java.nio.channels.FileChannel in) Creates a new instance that fetches data from the specified file.
ChunkedNioFile(java.nio.channels.FileChannel in, int chunkSize) Creates a new instance that fetches data from the specified file.
ChunkedNioFile(java.nio.channels.FileChannel in, long offset, long length, int chunkSize) Creates a new instance that fetches data from the specified file.
ChunkedNioFile(java.io.File in, int chunkSize) Creates a new instance that fetches data from the specified file.

Method Summary

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.
ByteBuf	readChunk(ChannelHandlerContext ctx) 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(java.io.File in)
               throws java.io.IOException

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

Throws:

java.io.IOException

ChunkedNioFile

public ChunkedNioFile(java.io.File in,
                      int chunkSize)
               throws java.io.IOException

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

Parameters:

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

Throws:

java.io.IOException

ChunkedNioFile

public ChunkedNioFile(java.nio.channels.FileChannel in)
               throws java.io.IOException

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

Throws:

java.io.IOException

ChunkedNioFile

public ChunkedNioFile(java.nio.channels.FileChannel in,
                      int chunkSize)
               throws java.io.IOException

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

Parameters:

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

Throws:

java.io.IOException

ChunkedNioFile

public ChunkedNioFile(java.nio.channels.FileChannel in,
                      long offset,
                      long length,
                      int chunkSize)
               throws java.io.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(ChannelHandlerContext) call

Throws:

java.io.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 java.lang.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:

java.lang.Exception

close

public void close()
           throws java.lang.Exception

Description copied from interface: ChunkedInput

Releases the resources associated with the input.

Specified by:

close in interface ChunkedInput<ByteBuf>

Throws:

java.lang.Exception

readChunk

public ByteBuf readChunk(ChannelHandlerContext ctx)
                  throws java.lang.Exception

Description copied from interface: ChunkedInput

Fetches a chunked data from the stream. Once this method returns the last chunk and thus the stream has reached at its end, any subsequent ChunkedInput.isEndOfInput() call must return true.

Specified by:

readChunk in interface ChunkedInput<ByteBuf>

Returns:

the fetched chunk. null if there is no data left in the stream. Please note that null does not necessarily mean that the stream has reached at its end. In a slow stream, the next chunk might be unavailable just momentarily.

Throws:

java.lang.Exception