org.apache.http.impl.nio.codecs
Class LengthDelimitedEncoder

java.lang.Object
  org.apache.http.impl.nio.codecs.AbstractContentEncoder
      org.apache.http.impl.nio.codecs.LengthDelimitedEncoder

All Implemented Interfaces:

ContentEncoder, FileContentEncoder

public class LengthDelimitedEncoder
extends AbstractContentEncoder
implements FileContentEncoder

Content encoder that cuts off after a defined number of bytes. This class is used to send content of HTTP messages where the end of the content entity is determined by the value of the Content-Length header. Entities transferred using this stream can be maximum Long.MAX_VALUE long.

This decoder is optimized to transfer data directly from a FileChannel to the underlying I/O session's channel whenever possible avoiding intermediate buffering in the session buffer.

Since:

4.0

Field Summary

Fields inherited from class org.apache.http.impl.nio.codecs.AbstractContentEncoder

buffer, channel, completed, metrics

Constructor Summary

LengthDelimitedEncoder(WritableByteChannel channel, SessionOutputBuffer buffer, HttpTransportMetricsImpl metrics, long contentLength)

LengthDelimitedEncoder(WritableByteChannel channel, SessionOutputBuffer buffer, HttpTransportMetricsImpl metrics, long contentLength, int fragementSizeHint)

Method Summary

String	toString()
long	transfer(FileChannel src, long position, long count) Transfers a portion of entity content from the given file channel to the underlying network channel.
int	write(ByteBuffer src) Writes a portion of entity content to the underlying channel.

Methods inherited from class org.apache.http.impl.nio.codecs.AbstractContentEncoder

assertNotCompleted, complete, flushToChannel, isCompleted, writeToBuffer, writeToChannel, writeToChannel

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.http.nio.ContentEncoder

complete, isCompleted

Constructor Detail

LengthDelimitedEncoder

public LengthDelimitedEncoder(WritableByteChannel channel,
                              SessionOutputBuffer buffer,
                              HttpTransportMetricsImpl metrics,
                              long contentLength,
                              int fragementSizeHint)

Parameters:

channel - underlying channel.

buffer - session buffer.

metrics - transport metrics.

contentLength - content length.

fragementSizeHint - fragment size hint defining an minimal size of a fragment that should be written out directly to the channel bypassing the session buffer. Value 0 disables fragment buffering.

Since:

4.3

LengthDelimitedEncoder

public LengthDelimitedEncoder(WritableByteChannel channel,
                              SessionOutputBuffer buffer,
                              HttpTransportMetricsImpl metrics,
                              long contentLength)

Method Detail

write

public int write(ByteBuffer src)
          throws IOException

Description copied from interface: ContentEncoder

Writes a portion of entity content to the underlying channel.

Specified by:

write in interface ContentEncoder

Parameters:

src - The buffer from which content is to be retrieved

Returns:

The number of bytes read, possibly zero

Throws:

IOException - if I/O error occurs while writing content

transfer

public long transfer(FileChannel src,
                     long position,
                     long count)
              throws IOException

Description copied from interface: FileContentEncoder

Transfers a portion of entity content from the given file channel to the underlying network channel.

Specified by:

transfer in interface FileContentEncoder

Parameters:

src - the source FileChannel to transfer data from.

position - The position within the file at which the transfer is to begin; must be non-negative

count - The maximum number of bytes to be transferred; must be non-negative

Returns:

The number of bytes, possibly zero, that were actually transferred

Throws:

IOException - if some I/O error occurs.

toString

public String toString()

Overrides:

toString in class Object