Re: Interceptors between services

[Raymond Feng]

Hi,

You need to add an extension to Tuscany and then you can add interceptors as 
follows:

1) Implement the org.apache.tuscany.sca.invocation.Interceptor interface for 
your interceptor

2) Implement org.apache.tuscany.sca.runtime.RuntimeWireProcessor interface

public void process(RuntimeWire wire) {
   List<InvocationChain> chains = wire.getInvocationChains();
   for (InvocationChain chain : chains) {
           chain.addInterceptor(...); // Add your interceptor here per 
operation
   }
}

3) Implement org.apache.tuscany.sca.core.ModuleActivator interface and 
register your impl class with 
org.apache.tuscany.sca.runtime.RuntimeWireProcessorExtensionPoint in the 
module activator.

public class YourModuleActivator implements ModuleActivator {
   public void start(ExtensionPointRegistry registry) {
       RuntimeWireProcessorExtensionPoint wireProcessorExtensionPoint = 
registry.getExtensionPoint(RuntimeWireProcessorExtensionPoint.class);
       if (wireProcessorExtensionPoint != null) {
           wireProcessorExtensionPoint.addWireProcessor(new 
YourRuntimeWireProcessor(mediator, dataBindings));
       }
   }

   public void stop(ExtensionPointRegistry registry) {
   }
}

4) Register your module activator in a file named 
"META-INF/services/org.apache.tuscany.sca.core.ModuleActivator". The content 
of the file will be the implementation class of your module activator.

The steps are a bit involved. We could simplify the RuntimeWireProcessor 
extensions by allowing registration using 
"META-INF/services/org.apache.tuscany.sca.runtime.RuntimeWireProcessor". 
This will be a TODO for our future releases.

Thanks,
Raymond

----- Original Message ----- 
From: "haleh mahbod" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Monday, October 22, 2007 9:53 PM
Subject: Re: Interceptors between services


Hi Deepak,
There is support for policy in SCA release 1.0. Is this what you are
referring to here?

Haleh

On 8/3/07, Deepak Nadig <[EMAIL PROTECTED]> wrote:


Hi,

Are there any plans for an interceptor model between service invocations?
While the framework does a good job in wiring services into a composite, 
I
did not find a good way for applications to intercept calls into/out-of
services.

Thanks,

Deepak






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