Venkat,
For solving the issue of interfaces needing to extend java.RMI.Remote
and needing to throw exceptions that extend java.RMI.RemoteException,
would it be possible to code-generate interfaces that are based on
the original POJO interfaces but conform to the RMI rules?
I would expect that EJB 3 has solved a similar problem arising from
its introduction of business interfaces. Somewhere under the covers
of an EJB3 there must be an RMI-IIOP remote interface that conforms
to the RMI rules and has the same methods as the business interface.
I am guessing that this RMI remote interface is generated from the
business interface, wither as source code or bytecode. Does anyone
happen to know more about how this works?
Simon
Venkatakrishnan (JIRA) wrote:
[ http://issues.apache.org/jira/browse/TUSCANY-467?page=all ]
Venkatakrishnan updated TUSCANY-467:
------------------------------------
Attachment: binding.rmi.zip
hellworld-rmi-server.zip
hellworld-rmi-client.zip
This is my first shot at developing extensions. I have created a simple RMI
Binding extension. Though it works, there are some issues which had to be
worked around. I hope to resolve them with the help of the community as my
induvidual attempts have failed. Since this is still open for improvments I am
not attaching the codes for this as a patch. I have rather attached them as
project zip files that can be extracted and tried out. So play around with
them and suggest if this is useful to have and the areas that need to be taken
care of. The issues that I faced have been stated in the sub-heading 'Issues'.
Installation
----------------
You may extract the zip binding.rmi.zip into the java/sca/bindings folder and
helloworld-rmi-server.zip and helloworld-rmi-client.zip into java/samples/sca
folders in the Tuscany codebase local to your machine. These three zips
contain three projects that have been built locally and hence contain the
compiled class files. The eclipse projects have also been generated for these.
Hence you my even import these projects into your Eclipse IDE.
sample-helloworld-rmi
----------------------------------
This is a sample to demonstrate rmi bindings for entry points.
1) Go to the sample-helloworld-rmi project directory. Go to the target/classes
sub directory within and start the rmiregistry. Alternatively you may start
the rmiregistry elsewhere provided the remote interfaces are in the classpath.
2) Run the class helloworld.HelloWorldServer from the helloworld-rmi project
Issues
----------------
- This is not complete in the sense that the interface
helloworld.HelloWorldService has been modified to extend from java.rmi.Remote
and the method 'getGreetings' has been modified to throw
java.rmi.RemoteException. It is essential for the remote interfaces to have
this sort of signature.
In real applications I don't think we can ask the application assemblers / developers to modify the service interfaces this way. I have tried several options in trying to maintain the HelloWorldSevice interface as it and generating a Remote interface dynamically using asm and cglib libraries, but none of them allow me to create a java interface that extends from java.rmi.Remote. I hope to be able to achieve this with some help from the community.
sample-helloworldrmiclient
--------------------------------------
This is a sample to demonstrate rmi bindings for external services.
1) Ensure that the HelloWorldServer under sample-helloworld-rmi is up and
running.
2) Go to the sample-helloworldrmiclient project and run the class
helloworld.HelloWorldClient with the following JVM arguments
-Djava.security.manager -Djava.security.policy=<location of the java.policy
file>
There is a sample java.policy file in the target/classes directory of this project.
Issues
---------
- Is it a good idea to load the Security Manger programmatically in the
'bindings' code or should that be left to application developers to decide.
- Should we also draw a schema for including policy statements in the sca.module file when external services are defined.
Java RMI Binding Extension
--------------------------
Key: TUSCANY-467
URL: http://issues.apache.org/jira/browse/TUSCANY-467
Project: Tuscany
Type: New Feature
Components: Java SCA Samples
Reporter: Venkatakrishnan
Priority: Minor
Attachments: binding.rmi.zip, hellworld-rmi-client.zip, hellworld-rmi-server.zip
Create Java RMI bindings for Tuscany to enable components to connect to
external RMI services and also allow components to be exposted as RM services.
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