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/*
 * Fabric3
 * Copyright (c) 2009-2015 Metaform Systems
 *
 * 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.
 * Portions originally based on Apache Tuscany 2007
 * licensed under the Apache 2.0 license.
 */
package org.fabric3.jpa.runtime;

import javax.transaction.TransactionManager;
import java.util.function.Supplier;

import org.fabric3.api.host.Fabric3Exception;
import org.fabric3.jpa.api.EntityManagerFactoryResolver;
import org.fabric3.jpa.api.PersistenceOverrides;
import org.fabric3.jpa.provision.PersistenceContextWireTarget;
import org.fabric3.jpa.runtime.proxy.EntityManagerService;
import org.fabric3.jpa.runtime.proxy.MultiThreadedEntityManagerProxy;
import org.fabric3.jpa.runtime.proxy.StatefulEntityManagerProxy;
import org.fabric3.spi.container.builder.TargetWireAttacher;
import org.oasisopen.sca.annotation.Reference;

/**
 * Attaches the target side of entity manager factories.
 */
public class PersistenceContextWireAttacher implements TargetWireAttacher {
    private EntityManagerFactoryResolver emfResolver;
    private TransactionManager tm;
    private EntityManagerService emService;

    /**
     * Constructor.
     *
     * @param emService   the service for creating EntityManagers
     * @param tm          the transaction manager
     * @param emfResolver the EMF builder
     */
    public PersistenceContextWireAttacher(@Reference EntityManagerService emService,
                                          @Reference TransactionManager tm,
                                          @Reference EntityManagerFactoryResolver emfResolver) {
        this.emfResolver = emfResolver;
        this.emService = emService;
        this.tm = tm;
    }

    public Supplier createSupplier(PersistenceContextWireTarget definition) throws Fabric3Exception {
        String unitName = definition.getUnitName();
        ClassLoader oldCl = Thread.currentThread().getContextClassLoader();
        try {
            // get the classloader for the entity manager factory
            ClassLoader classLoader = definition.getClassLoader();
            Thread.currentThread().setContextClassLoader(classLoader);
            // eagerly build the the EntityManagerFactory
            PersistenceOverrides overrides = definition.getOverrides();
            emfResolver.resolve(unitName, overrides, classLoader);
            if (definition.isMultiThreaded()) {
                return () -> new MultiThreadedEntityManagerProxy(unitName, emService, tm);
            } else {
                return () -> new StatefulEntityManagerProxy(unitName, emService, tm);
            }
        } finally {
            Thread.currentThread().setContextClassLoader(oldCl);
        }
    }

}