Remote Object Activation - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档
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Remote Object Activation |
Contents of the JavaTM 2 SDK, Standard Edition, v 1.2 |
- Prior to the release of the JavaTM
2 SDK, an instance of a
UnicastRemoteObject could be
accessed from a program that (1) created an instance of the remote
object, and (2) ran all the time. Now with the introduction of the
class java.rmi.activation.Activatable and the RMI daemon,
rmid, programs can be written to register information
about remote object implementations that should be created and execute
"on demand", rather than running all the time. The RMI daemon,
rmid, provides a Java virtual machine (JVM) from which
other JVM instances may be spawned.
Starting out with activation
None of the activation tutorials should be the first material you
read on RMI. If you have never used RMI before, you should take a look
at Getting Started before you
try these. The first three activation tutorials are intended for
developers who have had some experience developing Java programs that
access remote objects by means of the RMI classes provided as part of
the Java 2 SDK.
- Creating an Activatable Object
- Making a UnicastRemoteObject Activatable
- Activating an object that does not extend java.rmi.activation.Activatable
This tutorial illustrates the process of creating a new class that extends
java.rmi.activation.Activatable.
This tutorial takes you through the process of moving an existing remote object implementation, that extends
UnicastRemoteObject, to a class that
extends java.rmi.activation.Activatable.
This tutorial shows you how to use the static method
Activatable.exportObject in the constructor of a class
that does not extend from Activatable, and how to create a
remote interface, based on the methods that should be made available to
remote clients.
This next tutorial on using a
MarshalledObject is intended
for developers who have gone through at least one of the first three activation
tutorials. More tutorials may be added to this section in a future release,
based on your feedback.
For all of the source code used in the activation tutorials, you may choose from these formats:
For more information on object activation, you can also refer to the RMI Specification.We are very interested in knowing whether these tutorials are useful. Please send any comments or suggestions to: rmi-comments@java.sun.com, with a subject of "activation tutorials".
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