org.jgroups
Class Header

java.lang.Object
  extended by org.jgroups.Header
All Implemented Interfaces:
java.io.Externalizable, java.io.Serializable
Direct Known Subclasses:
AuthHeader, BSH.BshHeader, CAUSAL.CausalHeader, CAUSAL.CausalNewViewHeader, COMPRESS.CompressHeader, DISCARD.DiscardHeader, ENCRYPT.EncryptHeader, FC.FcHeader, FD_ALL.Header, FD_SIMPLE.FdHeader, FD_SOCK.FdHeader, FD.FdHeader, FLUSH.FlushHeader, FragHeader, GMS.GmsHeader, HTOTAL.HTotalHeader, MERGE3.CoordAnnouncement, MERGEFAST.MergefastHeader, MuxHeader, NakAckHeader, PingHeader, PullPushAdapter.PullHeader, RequestCorrelator.Header, SEQUENCER.SequencerHeader, SFC.Header, SMACK.SmackHeader, STABLE.StableHeader, STATE_TRANSFER.StateHeader, STREAMING_STATE_TRANSFER.StateHeader, TcpHeader, TpHeader, TunnelHeader, UdpHeader, UNICAST.UnicastHeader, VERIFY_SUSPECT.VerifyHeader, VIEW_SYNC.ViewSyncHeader

public abstract class Header
extends java.lang.Object
implements java.io.Externalizable

Abstract base class for all headers to be added to a Message.

Author:
Bela Ban
See Also:
Serialized Form

Field Summary
static int HDR_OVERHEAD
           
 
Constructor Summary
Header()
           
 
Method Summary
 int size()
          To be implemented by subclasses.
 java.lang.String toString()
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface java.io.Externalizable
readExternal, writeExternal
 

Field Detail

HDR_OVERHEAD

public static final int HDR_OVERHEAD
See Also:
Constant Field Values
Constructor Detail

Header

public Header()
Method Detail

size

public int 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.


toString

public java.lang.String toString()
Overrides:
toString in class java.lang.Object


Copyright ? 1998-2008 Bela Ban. All Rights Reserved.