org.jgroups.blocks

Class RequestCorrelator.Header

java.lang.Object

org.jgroups.Header

org.jgroups.blocks.RequestCorrelator.Header

All Implemented Interfaces:

Streamable

Direct Known Subclasses:

RequestCorrelator.MultiDestinationHeader

Enclosing class:

RequestCorrelator

public static class RequestCorrelator.Header
extends Header

The header for RequestCorrelator messages

Field Summary

Fields

Modifier and Type	Field and Description
short	corrId The unique ID of the associated RequestCorrelator
long	id The id of this request to distinguish among other requests from the same RequestCorrelator
static byte	REQ
static byte	RSP
boolean	rsp_expected msg is synchronous if true
byte	type Type of header: request or reply

Constructor Summary

Constructors

Constructor and Description
Header() Used for externalization
Header(byte type, long id, boolean rsp_expected, short corr_id)

Method Summary

Modifier and Type	Method and Description
void	readFrom(DataInputStream in) Read the state of the current object (including superclasses) from instream Note that the input stream must not be closed
int	size() To be implemented by subclasses.
String	toString()
void	writeTo(DataOutputStream out) Write the entire state of the current object (including superclasses) to outstream.

Methods inherited from class java.lang.Object

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

Field Detail

REQ

public static final byte REQ

See Also:

Constant Field Values

RSP

public static final byte RSP

See Also:

Constant Field Values

type

public byte type

Type of header: request or reply

id

public long id

The id of this request to distinguish among other requests from the same RequestCorrelator

rsp_expected

public boolean rsp_expected

msg is synchronous if true

corrId

public short corrId

The unique ID of the associated RequestCorrelator

Constructor Detail

Header

public Header()

Used for externalization

Header

public Header(byte type,
              long id,
              boolean rsp_expected,
              short corr_id)

Parameters:

type - type of header (REQ/RSP)

id - id of this header relative to ids of other requests originating from the same correlator

rsp_expected - whether it's a sync or async request

corr_id - The ID of the RequestCorrelator from which

Method Detail

toString

public String toString()

Overrides:

toString in class Header

writeTo

public void writeTo(DataOutputStream out)
             throws IOException

Description copied from interface: Streamable

Write the entire state of the current object (including superclasses) to outstream. Note that the output stream must not be closed

Throws:

IOException

readFrom

public void readFrom(DataInputStream in)
              throws IOException,
                     IllegalAccessException,
                     InstantiationException

Description copied from interface: Streamable

Read the state of the current object (including superclasses) from instream Note that the input stream must not be closed

Throws:

IOException

IllegalAccessException

InstantiationException

size

public int size()

Description copied from class: Header

To be implemented by subclasses. Return the size of this object for the serialized version of it. I.e. how many bytes this object takes when flattened into a buffer. This may be different for each instance, or can be the same. This may also just be an estimation. E.g. FRAG uses it on Message to determine whether or not to fragment the message. Fragmentation itself will be accurate, because the entire message will actually be serialized into a byte buffer, so we can determine the exact size.

Specified by:

size in class Header