net.tomp2p.message

Class MessageHeaderCodec

java.lang.Object

net.tomp2p.message.MessageHeaderCodec

public final class MessageHeaderCodec
extends Object

Encodes and decodes the header using a Netty Buffer.

Author:

Thomas Bocek

Field Summary

Fields

Modifier and Type	Field and Description
static int	HEADER_SIZE

Method Summary

Methods

Modifier and Type	Method and Description
static Message.Content[]	decodeContentTypes(int contentTypes, Message message) Decodes the content types from a 32bit number.
static Message	decodeHeader(io.netty.buffer.ByteBuf buffer, InetSocketAddress recipient, InetSocketAddress sender) Decode a message header from a Netty buffer.
static int	encodeContentTypes(Message.Content[] contentTypes) Encodes the content types to a 32bit number.
static io.netty.buffer.ByteBuf	encodeHeader(io.netty.buffer.ByteBuf buffer, Message message) Encodes the message object.

Methods inherited from class java.lang.Object

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

Field Detail

HEADER_SIZE

public static final int HEADER_SIZE

See Also:

Constant Field Values

Method Detail

encodeHeader

public static io.netty.buffer.ByteBuf encodeHeader(io.netty.buffer.ByteBuf buffer,
                                   Message message)

Encodes the message object. The format looks as follows: 28bit p2p version - 4bit message type - 32bit id - 8bit message command - 160bit sender id - 16bit tcp port - 16bit udp port - 160bit recipient id - 32bit content types - 8bit options. It total, the header is of size 58 bytes.

Parameters:

buffer - The Netty buffer to fill

message - The message with the header that will be serialized

Returns:

The buffer passed as an argument

decodeHeader

public static Message decodeHeader(io.netty.buffer.ByteBuf buffer,
                   InetSocketAddress recipient,
                   InetSocketAddress sender)

Decode a message header from a Netty buffer. The format looks as follows: 28bit p2p version - 4bit message type - 32bit id - 8bit message command - 160bit sender id - 16bit tcp port - 16bit udp port - 160bit recipient id - 32bit content types - 8bit options. It total, the header is of size 58 bytes.

Parameters:

buffer - The buffer to decode from

recipient - The recipient of the message

sender - The sender of the packet, which has been set in the socket class

Returns:

The partial message, only the header fields are filled

encodeContentTypes

public static int encodeContentTypes(Message.Content[] contentTypes)

Encodes the content types to a 32bit number. Opposite of #decodeContentTypes(int).

Parameters:

contentTypes - The 8 content types. Null means Empty

Returns:

The encoded 32bit number

decodeContentTypes

public static Message.Content[] decodeContentTypes(int contentTypes,
                                   Message message)

Decodes the content types from a 32bit number. Opposite of #encodeContentTypes(Content[]).

Parameters:

contentTypes - The 8 content types. No null values are returned

message -

Returns:

The decoded content types