/*
* 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.deltaspike.data.impl.handler;
import java.io.Serializable;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.inject.Inject;
import org.apache.deltaspike.data.api.Repository;
import org.apache.deltaspike.data.impl.builder.QueryBuilder;
import org.apache.deltaspike.data.impl.builder.QueryBuilderFactory;
import org.apache.deltaspike.data.impl.meta.Initialized;
import org.apache.deltaspike.data.impl.meta.RepositoryComponent;
import org.apache.deltaspike.data.impl.meta.RepositoryComponents;
import org.apache.deltaspike.data.impl.meta.RepositoryMethod;
/**
* Entry point for query processing.
*/
@Repository
public class QueryHandler implements Serializable, InvocationHandler
{
private static final long serialVersionUID = 1L;
private static final Logger log = Logger.getLogger(QueryHandler.class.getName());
@Inject
private QueryBuilderFactory queryBuilder;
@Inject
@Initialized
private RepositoryComponents components;
@Inject
private CdiQueryContextHolder context;
@Inject
private EntityManagerLookup entityManagerLookup;
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable
{
CdiQueryInvocationContext queryContext = null;
try
{
List<Class<?>> candidates = extractFromProxy(proxy.getClass());
RepositoryComponent repo = components.lookupComponent(candidates);
RepositoryMethod repoMethod = components.lookupMethod(repo.getRepositoryClass(), method);
queryContext = createContext(proxy, method, args, repo, repoMethod);
QueryBuilder builder = queryBuilder.build(repoMethod);
Object result = builder.execute(queryContext);
return result;
}
catch (Exception e)
{
log.log(Level.SEVERE, "Query execution error", e);
if (queryContext != null)
{
throw new QueryInvocationException(e, queryContext);
}
throw new QueryInvocationException(e, proxy.getClass(), method);
}
finally
{
context.dispose();
}
}
private CdiQueryInvocationContext createContext(Object proxy, Method method,
Object[] args, RepositoryComponent repo, RepositoryMethod repoMethod)
{
CdiQueryInvocationContext queryContext = new CdiQueryInvocationContext(proxy, method, args, repoMethod,
entityManagerLookup.lookupFor(repo));
context.set(queryContext);
return queryContext;
}
protected List<Class<?>> extractFromProxy(Class<?> proxyClass)
{
List<Class<?>> result = new LinkedList<Class<?>>();
result.add(proxyClass);
if (isInterfaceProxy(proxyClass))
{
result.addAll(Arrays.asList(proxyClass.getInterfaces()));
}
else
{
result.add(proxyClass.getSuperclass());
}
return result;
}
private boolean isInterfaceProxy(Class<?> proxyClass)
{
Class<?>[] interfaces = proxyClass.getInterfaces();
return Proxy.class.equals(proxyClass.getSuperclass()) &&
interfaces != null && interfaces.length > 0;
}
}