org.ow2.jonas.discovery.base
Class DiscHelper

java.lang.Object
  org.ow2.jonas.discovery.base.DiscHelper

Direct Known Subclasses:

DiscoveryHelper, JGroupsDiscoveryUtils

public class DiscHelper
extends Object

Discovery Helper. Convert objects to bytes and vice versa.

Author:

eyindanga

Constructor Summary

DiscHelper()

Method Summary

static Object	bytesToObject(byte[] bytes) Gets DiscEvenet, DiscMessage, or DiscGreeting from bytes array.
static byte[]	objectToBytes(Object obj) Construct a byte[] containing type info about a DiscMessage object to be sent, plus the content of this message.

Methods inherited from class java.lang.Object

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

Constructor Detail

DiscHelper

public DiscHelper()

Method Detail

objectToBytes

public static byte[] objectToBytes(Object obj)
                            throws IOException

Construct a byte[] containing type info about a DiscMessage object to be sent, plus the content of this message.

Parameters:

obj - Object to be send. Only supported DiscMessage objects.

Returns:

Null if the object is not an instance of DiscMessage or one of its subclasses.

Throws:

IOException - Could not create an ObjectOutputStream to write into the underlying ByteArrayOutputStream.

bytesToObject

public static Object bytesToObject(byte[] bytes)
                            throws IOException,
                                   ClassNotFoundException

Gets DiscEvenet, DiscMessage, or DiscGreeting from bytes array.

Parameters:

bytes - byte[] containing a received message

Returns:

Null if the object in the received message is not of one of the known types, or the object which have been sent.

Throws:

IOException - Could not create an ObjectInputStream to read in it

ClassNotFoundException - Class of a serialized object cannot be found