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org.jgroups.protocols
Class FragHeader  

java.lang.Object
  org.jgroups.Header
      org.jgroups.protocols.FragHeader

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable, org.jgroups.util.Streamable

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public class FragHeader

extends org.jgroups.Header

implements org.jgroups.util.Streamable

Version:

$Id: FragHeader.java,v 1.2 2005/04/15 13:17:02 belaban Exp $

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Field Summary
int	frag_id
long	id
int	num_frags

 

Fields inherited from class org.jgroups.Header

HDR_OVERHEAD

 

Constructor Summary

FragHeader()

FragHeader(long id, int frag_id, int num_frags)

 

Method Summary
void	readExternal(java.io.ObjectInput in)           This method restores an object's state by reading in the instance data for the object from the passed in stream.
void	readFrom(java.io.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.
java.lang.String	toString()           Convert this Object to a human-readable String.
void	writeExternal(java.io.ObjectOutput out)           This method is responsible for writing the instance data of an object to the passed in stream.
void	writeTo(java.io.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

id

public long id

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frag_id

public int frag_id

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num_frags

public int num_frags

Constructor Detail

FragHeader

public FragHeader()

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FragHeader

public FragHeader(long id,
                  int frag_id,
                  int num_frags)

Method Detail

toString

public java.lang.String toString()

Description copied from class: java.lang.Object

Convert this Object to a human-readable String. There are no limits placed on how long this String should be or what it should contain. We suggest you make it as intuitive as possible to be able to place it into System.out.println() 55 and such.

It is typical, but not required, to ensure that this method never completes abruptly with a java.lang.RuntimeException.

This method will be called when performing string concatenation with this object. If the result is null, string concatenation will instead use "null".

The default implementation returns getClass().getName() + "@" + Integer.toHexString(hashCode()).

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writeExternal

public void writeExternal(java.io.ObjectOutput out)
                   throws java.io.IOException

Description copied from interface: java.io.Externalizable

This method is responsible for writing the instance data of an object to the passed in stream. Note that this stream is not a subclass of OutputStream, but rather is a class that implements the ObjectOutput interface. That interface provides a number of methods for writing Java data values to a stream.

Not that the implementation of this method must be coordinated with the implementation of readExternal.

Specified by:

writeExternal in interface java.io.Externalizable

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readExternal

public void readExternal(java.io.ObjectInput in)
                  throws java.io.IOException,
                         java.lang.ClassNotFoundException

Description copied from interface: java.io.Externalizable

This method restores an object's state by reading in the instance data for the object from the passed in stream. Note that this stream is not a subclass of InputStream, but rather is a class that implements the ObjectInput interface. That interface provides a mechanism for reading in Java data types from a stream.

Note that this method must be compatible with writeExternal. It must read back the exact same types that were written by that method in the exact order they were written.

If this method needs to read back an object instance, then the class for that object must be found and loaded. If that operation fails, then this method throws a ClassNotFoundException

Specified by:

readExternal in interface java.io.Externalizable

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writeTo

public void writeTo(java.io.DataOutputStream out)
             throws java.io.IOException

Description copied from interface: org.jgroups.util.Streamable

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 org.jgroups.util.Streamable

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size

public long size()

Description copied from class: org.jgroups.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.

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readFrom

public void readFrom(java.io.DataInputStream in)
              throws java.io.IOException,
                     java.lang.IllegalAccessException,
                     java.lang.InstantiationException

Description copied from interface: org.jgroups.util.Streamable

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 org.jgroups.util.Streamable

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