org.jgroups.protocols.pbcast

Class STATE_TRANSFER.StateHeader

Enclosing Class:
STATE_TRANSFER
Implemented Interfaces:
Externalizable, Streamable

public static class STATE_TRANSFER.StateHeader
extends Header
implements Streamable

Wraps data for a state request/response. Note that for a state response the actual state will not

Field Summary

static byte
STATE_REQ
static byte
STATE_RSP

Fields inherited from class org.jgroups.Header

HDR_OVERHEAD

Constructor Summary

StateHeader()
StateHeader(byte type, Address sender, long id, Digest digest)

Method Summary

boolean
equals(Object o)
Digest
getDigest()
int
getType()
int
hashCode()
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

STATE_REQ

public static final byte STATE_REQ
Field Value:
1

STATE_RSP

public static final byte STATE_RSP
Field Value:
2

Constructor Details

StateHeader

public StateHeader()

StateHeader

public StateHeader(byte type,
                   Address sender,
                   long id,
                   Digest digest)

Method Details

equals

public boolean equals(Object o)

getDigest

public Digest getDigest()

getType

public int getType()

hashCode

public int hashCode()

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.