Injection into MethodInterceptor

[Pat Hougi]

Hi All,

I am attempting to provide an invoker service api which will comes with a MethodInterceptor which is responsible for closing a context. The idea behind the MethodInterceptor is, I want to seamlessly perform some context operations for the invokee without them realising its happening.

Here's what I have;

Intended Usage:

JbpmContext jBpmCtx = getCurrentContext();
FooService fooSrv = (FooService) ServiceInvokerUtil.getService("FooService", jBpmCtx);
fooSrv.addBars("snafu");

Service Wrapper:

public class ServiceInvokerUtil {

	public static Object getService(String serviceName, JbpmContext jbpmContext)
			throws ServiceInvocationException {
		ApplicationContext ctx = new FileSystemXmlApplicationContext(
				"config/invoker.xml");

		ctx.getBean("contextManager", new Object[] { jbpmContext });

		Object service = ctx.getBean(serviceName);

		return service;
	}

}

The Interceptor:

public class ServiceInvokerInterceptor implements MethodInterceptor {

	private boolean isAsync;

	private ContextManager context;

	public Object invoke(MethodInvocation m) throws Throwable {
		// Close the JBPMContext if this is Asynchronous invocation
		JbpmContext jBpmContext = getContext().getContext();
	        JbpmConfiguration config = jBpmContext.getJbpmConfiguration();
		if (isAsync()) {
			System.out.println("Executing Async Before Advice" + jBpmContext);
			getContext().close();
		} else {
			System.out.println("Executing Before Advice");
		}

		// Invoke the 3rd party system
		Object rspObj = m.proceed();

		// Reload the JBPMContext
		if (isAsync()) {
			System.out.println("Executing Async After Advice");
			config.createJbpmContext();
		} else {
			System.out.println("Executing After Advice");
		}

		return rspObj;
	}

// Async  and Context setters/getters ommitted !

The weaving config:

	<!-- Bean configuration -->
	    <bean id="proxyTemplate" class="org.springframework.aop.framework.ProxyFactoryBean" abstract="true">
	   	</bean>
	   
	    <bean id="syncInterceptor" class="com.mdsuk.bpe.extensions.invoker.ServiceInvokerInterceptor">
	   		<property name="async"><value>false</value></property>
	   		<property name="context"><ref local="contextManager"/></property>
	    </bean>
	   
		<bean id="asyncInterceptor" class="com.mdsuk.bpe.extensions.invoker.ServiceInvokerInterceptor">
			<property name="async"><value>true</value></property>

	   		<property name="context"><ref local="contextManager"/></property>
		</bean>
		   
		<bean id="contextManager" scope="prototype" class="com.mdsuk.bpe.extensions.invoker.ContextBeanFactory" factory-method="createContextBean">
			<constructor-arg>
				<null/>
			</constructor-arg>
  		</bean>
	   	
	   	<!-- Bean Classes -->
	   	<bean id="fooServiceTarget" class="com.mdsuk.bpe.extensions.invoker.test.FooServiceImpl">  	
	   	</bean>
	   	
	   	<bean id="FooService" parent="proxyTemplate">
			<property name="proxyInterfaces">
	        	<value>com.mdsuk.bpe.extensions.invoker.test.FooService</value>
	      	</property>
	      	<property name="target">
	         	<ref local="fooServiceTarget"/>
	      	</property>
	      	<property name="interceptorNames">
	    		<value>asyncInterceptor</value>
	    	</property>	      	
		</bean>

The problem:

I want to be able to set the context into the method interceptor programatically, as each context is a new instance and specific to the invokee.

I have tried to use a factory prototype bean and

		ctx.getBean("contextManager", new Object[] { jbpmContext });

to pump in the context passed by the invokee, but no joy

Can anyone point out what I'm doing wrong or if this is possible, I'm a Spring newbie so I may have made elementary mistakes here somewhere.

Thanks in advance
-- Pat