org.jgroups.protocols

Class FD.FdHeader

Enclosing Class:
FD
Implemented Interfaces:
Externalizable, Streamable

public static class FD.FdHeader
extends Header
implements Streamable

Field Summary

static byte
HEARTBEAT
static byte
HEARTBEAT_ACK
static byte
NOT_MEMBER
static byte
SUSPECT

Fields inherited from class org.jgroups.Header

HDR_OVERHEAD

Constructor Summary

FdHeader()
FdHeader(byte type)
FdHeader(byte type, Vector mbrs, Address from)

Method Summary

void
readExternal(ObjectInput in)
void
readFrom(DataInputStream in)
Read the state of the current object (including superclasses) from instream Note that the input stream must not be closed
long
size()
To be implemented by subclasses.
String
toString()
void
writeExternal(ObjectOutput out)
void
writeTo(DataOutputStream out)
Write the entire state of the current object (including superclasses) to outstream.

Methods inherited from class org.jgroups.Header

size, toString

Field Details

HEARTBEAT

public static final byte HEARTBEAT
Field Value:
0

HEARTBEAT_ACK

public static final byte HEARTBEAT_ACK
Field Value:
1

NOT_MEMBER

public static final byte NOT_MEMBER
Field Value:
3

SUSPECT

public static final byte SUSPECT
Field Value:
2

Constructor Details

FdHeader

public FdHeader()

FdHeader

public FdHeader(byte type)

FdHeader

public FdHeader(byte type,
                Vector mbrs,
                Address from)

Method Details

readExternal

public void readExternal(ObjectInput in)
            throws IOException,
                   ClassNotFoundException

readFrom

public void readFrom(DataInputStream in)
            throws IOException,
                   IllegalAccessException,
                   InstantiationException
Read the state of the current object (including superclasses) from instream Note that the input stream must not be closed
Specified by:
readFrom in interface Streamable

size

public long size()
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.
Overrides:
size in interface Header

toString

public String toString()
Overrides:
toString in interface Header

writeExternal

public void writeExternal(ObjectOutput out)
            throws IOException

writeTo

public void writeTo(DataOutputStream out)
            throws IOException
Write the entire state of the current object (including superclasses) to outstream. Note that the output stream must not be closed
Specified by:
writeTo in interface Streamable

Copyright B) 1998-2005 Bela Ban. All Rights Reserved.