org.springframework.integration.ip.tcp.serializer
Class ByteArrayLengthHeaderSerializer

java.lang.Object
  org.springframework.integration.ip.tcp.serializer.AbstractByteArraySerializer
      org.springframework.integration.ip.tcp.serializer.ByteArrayLengthHeaderSerializer

All Implemented Interfaces:

org.springframework.core.serializer.Deserializer<byte[]>, org.springframework.core.serializer.Serializer<byte[]>

public class ByteArrayLengthHeaderSerializer
extends AbstractByteArraySerializer

Reads data in an InputStream to a byte[]; data must be preceded by a binary length (network byte order, not included in resulting byte[]). Writes a byte[] to an OutputStream after a binary length. The length field contains the length of data following the length field. (network byte order). The default length field is a 4 byte signed integer. During deserialization, negative values will be rejected. Other options are an unsigned byte, and unsigned short. For other header formats, override readHeader(InputStream) and writeHeader(OutputStream, int).

Since:

2.0

Author:

Gary Russell

Field Summary

static int	HEADER_SIZE_INT Default length-header field, allows for data up to 2**31-1 bytes.
static int	HEADER_SIZE_UNSIGNED_BYTE A single unsigned byte, for data up to 255 bytes.
static int	HEADER_SIZE_UNSIGNED_SHORT An unsigned short, for data up to 2**16 bytes.

Fields inherited from class org.springframework.integration.ip.tcp.serializer.AbstractByteArraySerializer

maxMessageSize

Constructor Summary

ByteArrayLengthHeaderSerializer()
Constructs the serializer using HEADER_SIZE_INT

ByteArrayLengthHeaderSerializer(int headerSize)
Constructs the serializer using the supplied header size.

Method Summary

byte[]	deserialize(java.io.InputStream inputStream) Reads the header from the stream and then reads the provided length from the stream and returns the data in a byte[].
protected int	read(java.io.InputStream inputStream, byte[] buffer, boolean header) Reads data from the socket and puts the data in buffer.
protected int	readHeader(java.io.InputStream inputStream) Reads the header and returns the length of the data part.
void	serialize(byte[] bytes, java.io.OutputStream outputStream) Writes the byte[] to the output stream, preceded by a 4 byte length in network byte order (big endian).
protected void	writeHeader(java.io.OutputStream outputStream, int length) Writes the header, according to the header format.

Methods inherited from class org.springframework.integration.ip.tcp.serializer.AbstractByteArraySerializer

checkClosure, getMaxMessageSize, setMaxMessageSize

Methods inherited from class java.lang.Object

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

Field Detail

HEADER_SIZE_INT

public static final int HEADER_SIZE_INT

Default length-header field, allows for data up to 2**31-1 bytes.

See Also:

Constant Field Values

HEADER_SIZE_UNSIGNED_BYTE

public static final int HEADER_SIZE_UNSIGNED_BYTE

A single unsigned byte, for data up to 255 bytes.

See Also:

Constant Field Values

HEADER_SIZE_UNSIGNED_SHORT

public static final int HEADER_SIZE_UNSIGNED_SHORT

An unsigned short, for data up to 2**16 bytes.

See Also:

Constant Field Values

Constructor Detail

ByteArrayLengthHeaderSerializer

public ByteArrayLengthHeaderSerializer()

Constructs the serializer using HEADER_SIZE_INT

ByteArrayLengthHeaderSerializer

public ByteArrayLengthHeaderSerializer(int headerSize)

Constructs the serializer using the supplied header size. Valid header sizes are HEADER_SIZE_INT (default), HEADER_SIZE_UNSIGNED_BYTE and HEADER_SIZE_UNSIGNED_SHORT

Parameters:

headerSize -

Method Detail

deserialize

public byte[] deserialize(java.io.InputStream inputStream)
                   throws java.io.IOException

Reads the header from the stream and then reads the provided length from the stream and returns the data in a byte[]. Throws an IOException if the length field exceeds the maxMessageSize. Throws a SoftEndOfStreamException if the stream is closed between messages.

Throws:

java.io.IOException

serialize

public void serialize(byte[] bytes,
                      java.io.OutputStream outputStream)
               throws java.io.IOException

Writes the byte[] to the output stream, preceded by a 4 byte length in network byte order (big endian).

Throws:

java.io.IOException

read

protected int read(java.io.InputStream inputStream,
                   byte[] buffer,
                   boolean header)
            throws java.io.IOException

Reads data from the socket and puts the data in buffer. Blocks until buffer is full or a socket timeout occurs.

Parameters:

buffer -

header - true if we are reading the header

Returns:

< 0 if socket closed and not in the middle of a message

Throws:

java.io.IOException

writeHeader

protected void writeHeader(java.io.OutputStream outputStream,
                           int length)
                    throws java.io.IOException

Writes the header, according to the header format.

Parameters:

outputStream -

length -

Throws:

java.io.IOException

readHeader

protected int readHeader(java.io.InputStream inputStream)
                  throws java.io.IOException

Reads the header and returns the length of the data part.

Parameters:

inputStream -

Returns:

The length of the data part

Throws:

IOException, - SoftEndOfStreamException if socket closes before any length data read.

java.io.IOException