java.rmi
Class MarshalledObject

java.lang.Object
  java.rmi.MarshalledObject

All Implemented Interfaces:

Serializable

public final class MarshalledObject

extends Object

implements Serializable

A MarshalledObject contains a byte stream with the serialized representation of an object given to its constructor. The get method returns a new copy of the original object, as deserialized from the contained byte stream. The contained object is serialized and deserialized with the same serialization semantics used for marshaling and unmarshaling parameters and return values of RMI calls: When the serialized form is created:

• classes are annotated with a codebase URL from where the class can be loaded (if available), and
• any remote object in the MarshalledObject is represented by a serialized instance of its stub.

When copy of the object is retrieved (via the get method), if the class is not available locally, it will be loaded from the appropriate location (specified the URL annotated with the class descriptor when the class was serialized.

MarshalledObject facilitates passing objects in RMI calls that are not automatically deserialized immediately by the remote peer.

Since:

1.2

Author:

Ann Wollrath, Peter Jones

See Also:

Serialized Form

Nested Class Summary

private static class	MarshalledObject.MarshalledObjectInputStream The counterpart to MarshalledObjectOutputStream.
private static class	MarshalledObject.MarshalledObjectOutputStream This class is used to marshal objects for MarshalledObject.

Field Summary

private int	hash
private byte[]	locBytes
private byte[]	objBytes
private static long	serialVersionUID Indicate compatibility with 1.2 version of class.

Constructor Summary

MarshalledObject(Object obj)
Creates a new MarshalledObject that contains the serialized representation of the current state of the supplied object.

Method Summary

boolean	equals(Object obj) Compares this MarshalledObject to another object.
Object	get() Returns a new copy of the contained marshalledobject.
int	hashCode() Return a hash code for this MarshalledObject.

Methods inherited from class java.lang.Object

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

Field Detail

objBytes

private byte[] objBytes

locBytes

private byte[] locBytes

hash

private int hash

See Also:

hashCode()

serialVersionUID

private static final long serialVersionUID

Indicate compatibility with 1.2 version of class.

See Also:

Constant Field Values

Constructor Detail

MarshalledObject

public MarshalledObject(Object obj)
                 throws IOException

Creates a new MarshalledObject that contains the serialized representation of the current state of the supplied object. The object is serialized with the semantics used for marshaling parameters for RMI calls.

Parameters:

obj - the object to be serialized (must be serializable)

Throws:

IOException - if an IOException occurs; an IOException may occur if obj is not serializable.

Since:

1.2

Method Detail

get

public Object get()
           throws IOException,
                  ClassNotFoundException

Returns a new copy of the contained marshalledobject. The internal representation is deserialized with the semantics used for unmarshaling paramters for RMI calls.

Returns:

a copy of the contained object

Throws:

IOException - if an IOException occurs while deserializing the object from its internal representation.

ClassNotFoundException - if a ClassNotFoundException occurs while deserializing the object from its internal representation. could not be found

Since:

1.2

hashCode

public int hashCode()

Return a hash code for this MarshalledObject.

Overrides:

hashCode in class Object

Returns:

a hash code

See Also:

Object.equals(java.lang.Object), Hashtable

equals

public boolean equals(Object obj)

Compares this MarshalledObject to another object. Returns true if and only if the argument refers to a MarshalledObject that contains exactly the same serialized representation of an object as this one does. The comparison ignores any class codebase annotation, meaning that two objects are equivalent if they have the same serialized representation except for the codebase of each class in the serialized representation.

Overrides:

equals in class Object

Parameters:

obj - the object to compare with this MarshalledObject

Returns:

true if the argument contains an equaivalent serialized object; false otherwise

Since:

1.2

See Also:

Object.hashCode(), Hashtable