/*
* JBoss, Home of Professional Open Source
* Copyright 2010, Red Hat, Inc., and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jboss.seam.solder.servicehandler;
import java.lang.reflect.Method;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.inject.spi.InjectionTarget;
import javax.interceptor.AroundInvoke;
import javax.interceptor.InvocationContext;
import org.jboss.seam.solder.reflection.Reflections;
import org.jboss.seam.solder.reflection.annotated.AnnotatedTypeBuilder;
/**
* Manages the handler class for the service handler extension. This class is
* responsible for managing the lifecycle of the handler class instances
*
* @author Stuart Douglas
*
*/
class ServiceHandlerManager<T>
{
private final Class<T> handlerClass;
private final Method handlerMethod;
private final InjectionTarget<T> injectionTarget;
/**
* Creates a wrapper around an AutoProxy handler class
*
* @param handlerClass The handler class
* @throws IllegalArgumentException if the handler class is does not have a
* suitable @AroundInvoke method
*/
ServiceHandlerManager(Class<T> handlerClass, BeanManager beanManager) throws IllegalArgumentException
{
this.handlerClass = handlerClass;
handlerMethod = getHandlerMethod(handlerClass);
//now create the InjectionTarget
AnnotatedTypeBuilder<T> typeBuilder = new AnnotatedTypeBuilder<T>().readFromType(handlerClass);
injectionTarget = beanManager.createInjectionTarget(typeBuilder.create());
}
T create(CreationalContext<T> ctx)
{
T instance = injectionTarget.produce(ctx);
injectionTarget.inject(instance, ctx);
injectionTarget.postConstruct(instance);
return instance;
}
Object invoke(Object instance, InvocationContext ctx) throws Exception
{
return handlerMethod.invoke(instance, ctx);
}
Class<?> getHandlerClass()
{
return handlerClass;
}
private static Method getHandlerMethod(Class<?> handlerClass)
{
//search for the handler method
for (Method m : Reflections.getAllDeclaredMethods(handlerClass))
{
if (m.isAnnotationPresent(AroundInvoke.class))
{
if (m.getParameterTypes().length != 1 || m.getParameterTypes()[0] != InvocationContext.class)
{
throw new IllegalArgumentException("Could not find suitable AroundInvoke method on class " + handlerClass + " methods denoted @AroundInvoke must have a single InvokationContext parameter");
}
return m;
}
}
throw new IllegalArgumentException("Could not find suitable AroundInvoke method on class " + handlerClass);
}
}