org.eclipse.milo.opcua.stack.core.channel.headers

Class SequenceHeader

java.lang.Object

org.eclipse.milo.opcua.stack.core.channel.headers.SequenceHeader

public class SequenceHeader
extends Object

The sequence header ensures that the first encrypted block of every Message sent over a channel will start with different data.

SequenceNumbers may not be reused for any TokenId. The SecurityToken lifetime should be short enough to ensure that this never happens; however, if it does the receiver should treat it as a transport error and force a reconnect.

Field Summary

Fields

Modifier and Type	Field and Description
static int	SEQUENCE_HEADER_SIZE

Constructor Summary

Constructors

Constructor and Description
SequenceHeader(long sequenceNumber, long requestId)

Method Summary

Modifier and Type	Method and Description
static SequenceHeader	decode(io.netty.buffer.ByteBuf buffer)
static io.netty.buffer.ByteBuf	encode(SequenceHeader header, io.netty.buffer.ByteBuf buffer)
boolean	equals(Object o)
long	getRequestId()
long	getSequenceNumber()
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

SEQUENCE_HEADER_SIZE

public static final int SEQUENCE_HEADER_SIZE

See Also:

Constant Field Values

Constructor Detail

SequenceHeader

public SequenceHeader(long sequenceNumber,
                      long requestId)

Parameters:

sequenceNumber - a monotonically increasing sequence number assigned by the sender to each MessageChunk sent over the SecureChannel.

requestId - an identifier assigned by the Client to OPC UA request Message. All MessageChunks for the request and the associated response use the same identifier.

Method Detail

getSequenceNumber

public long getSequenceNumber()

getRequestId

public long getRequestId()

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

encode

public static io.netty.buffer.ByteBuf encode(SequenceHeader header,
                                             io.netty.buffer.ByteBuf buffer)

decode

public static SequenceHeader decode(io.netty.buffer.ByteBuf buffer)