/*
* Copyright 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 org.springframework.data.cassandra.repository.cdi;
import javax.enterprise.event.Observes;
import javax.enterprise.inject.UnsatisfiedResolutionException;
import javax.enterprise.inject.spi.AfterBeanDiscovery;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.inject.spi.ProcessBean;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import org.springframework.data.cassandra.core.CassandraOperations;
import org.springframework.data.repository.cdi.CdiRepositoryBean;
import org.springframework.data.repository.cdi.CdiRepositoryExtensionSupport;
/**
* A portable CDI extension which registers beans for Spring Data Cassandra repositories.
*
* @author Mark Paluch
*/
public class CassandraRepositoryExtension extends CdiRepositoryExtensionSupport {
private final Map<String, Bean<CassandraOperations>> cassandraOperationsMap = new HashMap<String, Bean<CassandraOperations>>();
/**
* Implementation of a an observer which checks for CassandraOperations beans and stores them in
* {@link #cassandraOperationsMap} for later association with corresponding repository beans.
*
* @param <T> The type.
* @param processBean The annotated type as defined by CDI.
*/
@SuppressWarnings("unchecked")
<T> void processBean(@Observes ProcessBean<T> processBean) {
Bean<T> bean = processBean.getBean();
for (Type type : bean.getTypes()) {
if (type instanceof Class<?> && CassandraOperations.class.isAssignableFrom((Class<?>) type)) {
cassandraOperationsMap.put(bean.getQualifiers().toString(), ((Bean<CassandraOperations>) bean));
}
}
}
/**
* Implementation of a an observer which registers beans to the CDI container for the detected Spring Data
* repositories.
* <p>
* The repository beans are associated to the EntityManagers using their qualifiers.
*
* @param beanManager The BeanManager instance.
*/
void afterBeanDiscovery(@Observes AfterBeanDiscovery afterBeanDiscovery, BeanManager beanManager) {
for (Map.Entry<Class<?>, Set<Annotation>> entry : getRepositoryTypes()) {
Class<?> repositoryType = entry.getKey();
Set<Annotation> qualifiers = entry.getValue();
CdiRepositoryBean<?> repositoryBean = createRepositoryBean(repositoryType, qualifiers, beanManager);
afterBeanDiscovery.addBean(repositoryBean);
registerBean(repositoryBean);
}
}
/**
* Creates a {@link Bean}.
*
* @param <T> The type of the repository.
* @param repositoryType The class representing the repository.
* @param beanManager The BeanManager instance.
* @return The bean.
*/
private <T> CdiRepositoryBean<T> createRepositoryBean(Class<T> repositoryType, Set<Annotation> qualifiers,
BeanManager beanManager) {
Bean<CassandraOperations> cassandraOperationsBean = this.cassandraOperationsMap.get(qualifiers.toString());
if (cassandraOperationsBean == null) {
throw new UnsatisfiedResolutionException(String.format("Unable to resolve a bean for '%s' with qualifiers %s.",
CassandraOperations.class.getName(), qualifiers));
}
return new CassandraRepositoryBean<T>(cassandraOperationsBean, qualifiers, repositoryType, beanManager,
getCustomImplementationDetector());
}
}