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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.tuscany.sca.implementation.java.introspect.impl;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.logging.Logger;
import org.apache.tuscany.sca.assembly.AssemblyFactory;
import org.apache.tuscany.sca.assembly.Service;
import org.apache.tuscany.sca.implementation.java.IntrospectionException;
import org.apache.tuscany.sca.implementation.java.JavaImplementation;
import org.apache.tuscany.sca.implementation.java.impl.JavaElementImpl;
import org.apache.tuscany.sca.interfacedef.InvalidInterfaceException;
import org.apache.tuscany.sca.interfacedef.java.JavaInterface;
import org.apache.tuscany.sca.interfacedef.java.JavaInterfaceContract;
import org.apache.tuscany.sca.interfacedef.java.JavaInterfaceFactory;
/**
* Processes an {@link org.osoa.sca.annotations.Service} annotation and updates
* the component type with corresponding {@link Service}s. Also processes
* related {@link org.osoa.sca.annotations.Callback} annotations.
*
* @version $$
*/
public class ConsumerProcessor extends BaseJavaClassVisitor {
@SuppressWarnings("unused")
private static final Logger logger = Logger.getLogger(ConsumerProcessor.class.getName());
private JavaInterfaceFactory javaFactory;
public ConsumerProcessor(AssemblyFactory assemblyFactory, JavaInterfaceFactory javaFactory) {
super(assemblyFactory);
this.javaFactory = javaFactory;
}
@Override
public void visitMethod(Method method, JavaImplementation type) throws IntrospectionException {
org.osoa.sca.annotations.Consumer annotation = method.getAnnotation(org.osoa.sca.annotations.Consumer.class);
if (annotation == null) {
return;
}
if(Modifier.isPrivate(method.getModifiers())) {
throw new IllegalConsumerException("Illegal annotation @Consumer found on "+method, method);
}
if (method.getParameterTypes().length != 1) {
throw new IllegalConsumerException("Consumer must have one parameter", method);
}
JavaElementImpl element = new JavaElementImpl(method.getDeclaringClass());
try {
createConsumer(type, element, annotation.name(), method);
} catch (InvalidInterfaceException e) {
throw new IntrospectionException(e);
}
}
/**
* Creates or updates a Consumer
* @param type - the JavaImplementation to which the consumer applies
* @param element - the Java class implementing the consumer
* @param consumerName - the Name of the consumer
* @param operationName - the Name of the operation (ie Method) annotated with @Consumer
* @throws IllegalConsumerException
*/
private void createConsumer(JavaImplementation type, JavaElementImpl element,
String consumerName, Method method )
throws IllegalConsumerException, InvalidInterfaceException {
// First, see if the Consumer already exists
org.apache.tuscany.sca.assembly.Consumer consumer = findConsumerByName( type, consumerName );
if( consumer == null ) {
// Create the consumer object and add it to the JavaImplementation
Class<?> consumerClass = element.getType();
consumer = assemblyFactory.createConsumer();
JavaInterfaceContract interfaceContract = javaFactory.createJavaInterfaceContract();
consumer.setInterfaceContract(interfaceContract);
consumer.setName(consumerName);
JavaInterface consumerInterface = javaFactory.createJavaInterface();
consumerInterface.setRemotable(true);
javaFactory.createJavaInterface(consumerInterface, consumerClass);
consumer.getInterfaceContract().setInterface(consumerInterface);
type.getConsumers().add(consumer);
} // end if
// Add the operation to the consumer
consumer.addOperation(method.getName(), getOperationEventTypes(method) );
} // end method createConsumer
private static String getOperationEventTypes( Method method ) {
// 1) If the method is annotated with @EventTypes, extract the supported event types from the annotation
org.osoa.sca.annotations.EventTypes annotation = method.getAnnotation(org.osoa.sca.annotations.EventTypes.class);
if (annotation != null) {
return annotation.value();
} // end if
// 2) If the method has a parameter that is NOT java.lang.Object, return its event type or its base Java type
Class<?> parameter = method.getParameterTypes()[0];
String className = parameter.getCanonicalName();
if( !className.equals("java.lang.Object")) {
org.osoa.sca.annotations.EventType eventType = parameter.getAnnotation(org.osoa.sca.annotations.EventType.class);
if (eventType != null) {
return eventType.name();
} else {
return className;
}// end if
} // end if
// 3) Else, return "null" meaning that the method supports "any event type"
return null;
} // end getOperationEventTypes
/**
* Finds a Consumer within a Java implementation by the name of the consumer
* @param impl - the Java implementation
* @param name - the consumer name
* @return - the Consumer with the specified name, or null if it does not exist
*/
private static org.apache.tuscany.sca.assembly.Consumer findConsumerByName( JavaImplementation impl, String name ) {
for( org.apache.tuscany.sca.assembly.Consumer consumer : impl.getConsumers() ) {
if( name.equals(consumer.getName()) ) return consumer;
} // end for
return null;
} // end method findConsumerByName
}
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