/*
* Copyright 2011-2014 the original author or authors.
*
* 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 pl.com.bottega.ecommerce.system.saga.impl;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.HashSet;
import javax.inject.Inject;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.stereotype.Component;
import pl.com.bottega.ecommerce.system.saga.SagaInstance;
import pl.com.bottega.ecommerce.system.saga.SagaManager;
import pl.com.bottega.ecommerce.system.saga.annotations.LoadSaga;
import pl.com.bottega.ecommerce.system.saga.annotations.SagaAction;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;
/**
* @author Rafał Jamróz
*/
@SuppressWarnings({"rawtypes" })
@Component
public class SpringSagaRegistry implements SagaRegistry, ApplicationListener<ContextRefreshedEvent> {
private Multimap<Class<?>, String> loadersInterestedIn = HashMultimap.create();
@Inject
private ConfigurableListableBeanFactory beanFactory;
@Override
public Collection<SagaManager> getLoadersForEvent(Object event) {
Collection<SagaManager> results = new HashSet<SagaManager>();
Collection<String> loadersBeansNames = loadersInterestedIn.get(event.getClass());
for (String loaderBeanName : loadersBeansNames) {
SagaManager loader = beanFactory.getBean(loaderBeanName, SagaManager.class);
results.add(loader);
}
return results;
}
@Override
public SagaInstance createSagaInstance(Class<? extends SagaInstance> sagaType) {
return (SagaInstance) beanFactory.getBean(sagaType);
}
@Override
public void onApplicationEvent(ContextRefreshedEvent event) {
loadersInterestedIn.clear();
registerSagaLoaderBeans();
}
private void registerSagaLoaderBeans() {
String[] loadersNames = beanFactory.getBeanNamesForType(SagaManager.class);
for (String loaderBeanName : loadersNames) {
BeanDefinition loaderBeanDefinition = beanFactory.getBeanDefinition(loaderBeanName);
try {
registerSagaLoader(Class.forName(loaderBeanDefinition.getBeanClassName()), loaderBeanName);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
private void registerSagaLoader(Class<?> loaderClass, String beanName) {
for (Method method : loaderClass.getMethods()) {
if (method.getAnnotation(SagaAction.class) != null || method.getAnnotation(LoadSaga.class) != null) {
Class<?>[] params = method.getParameterTypes();
if (params.length == 1) {
loadersInterestedIn.put(params[0], beanName);
} else {
throw new RuntimeException("incorred event hadndler: " + method);
}
}
}
}
}