/*
* Copyright 2016-2017 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.neo4j.repository.cdi;
import org.neo4j.ogm.session.Session;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.data.repository.cdi.CdiRepositoryBean;
import org.springframework.data.repository.cdi.CdiRepositoryExtensionSupport;
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.HashSet;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
import java.util.Set;
/**
* CDI extension to export Neo4j repositories.
*
* @author Mark Paluch
* @since 4.2
*/
public class Neo4jCdiRepositoryExtension extends CdiRepositoryExtensionSupport {
private static final Logger LOG = LoggerFactory.getLogger(Neo4jCdiRepositoryExtension.class);
private final Map<Set<Annotation>, Bean<Session>> sessions = new HashMap<Set<Annotation>, Bean<Session>>();
public Neo4jCdiRepositoryExtension() {
LOG.info("Activating CDI extension for Spring Data Neo4j repositories.");
}
@SuppressWarnings("unchecked")
<X> void processBean(@Observes ProcessBean<X> processBean) {
Bean<X> bean = processBean.getBean();
for (Type type : bean.getTypes()) {
if (type instanceof Class<?> && Session.class.isAssignableFrom((Class<?>) type)) {
if (LOG.isDebugEnabled()) {
LOG.debug(String.format("Discovered %s with qualifiers %s.", Session.class.getName(),
bean.getQualifiers()));
}
sessions.put(new HashSet<Annotation>(bean.getQualifiers()), (Bean<Session>) bean);
}
}
}
void afterBeanDiscovery(@Observes AfterBeanDiscovery afterBeanDiscovery, BeanManager beanManager) {
for (Entry<Class<?>, Set<Annotation>> entry : getRepositoryTypes()) {
Class<?> repositoryType = entry.getKey();
Set<Annotation> qualifiers = entry.getValue();
// Create the bean representing the repository.
CdiRepositoryBean<?> repositoryBean = createRepositoryBean(repositoryType, qualifiers, beanManager);
if (LOG.isInfoEnabled()) {
LOG.info(String.format("Registering bean for %s with qualifiers %s.", repositoryType.getName(),
qualifiers));
}
// Register the bean to the container.
registerBean(repositoryBean);
afterBeanDiscovery.addBean(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<Session> sessionBean = this.sessions.get(qualifiers);
if (sessionBean == null) {
throw new UnsatisfiedResolutionException(String.format(
"Unable to resolve a bean for '%s' with qualifiers %s.", Session.class.getName(), qualifiers));
}
return new Neo4jCdiRepositoryBean<T>(sessionBean, qualifiers, repositoryType, beanManager,
Optional.of(getCustomImplementationDetector()));
}
}