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package org.sca4j.jpa.runtime;

import java.net.URI;

import javax.transaction.TransactionManager;

import org.osoa.sca.annotations.Reference;
import org.sca4j.host.jpa.EmfBuilder;
import org.sca4j.jpa.provision.PersistenceContextWireTargetDefinition;
import org.sca4j.jpa.spi.classloading.EmfClassLoaderService;
import org.sca4j.spi.ObjectFactory;
import org.sca4j.spi.builder.WiringException;
import org.sca4j.spi.builder.component.TargetWireAttacher;
import org.sca4j.spi.model.physical.PhysicalWireSourceDefinition;
import org.sca4j.spi.wire.Wire;

/**
 * Attaches the target side of entity manager factories.
 *
 * @version $Revision$ $Date$
 */
public class PersistenceContextWireAttacher implements TargetWireAttacher {
    private EmfBuilder emfBuilder;
    private EmfClassLoaderService classLoaderService;
    private TransactionManager tm;
    private EntityManagerService emService;

    /**
     * Constructor.
     *
     * @param emService          the service for creating EntityManagers
     * @param tm                 the transaction manager
     * @param emfBuilder         the EMF builder
     * @param classLoaderService the classloader service for returning EMF classloaders
     */
    public PersistenceContextWireAttacher(@Reference EntityManagerService emService,
                                          @Reference TransactionManager tm,
                                          @Reference EmfBuilder emfBuilder,
                                          @Reference EmfClassLoaderService classLoaderService) {
        this.emfBuilder = emfBuilder;
        this.classLoaderService = classLoaderService;
        this.emService = emService;
        this.tm = tm;
    }

    public ObjectFactory createObjectFactory(PersistenceContextWireTargetDefinition definition) throws WiringException {
        String unitName = definition.getUnitName();
        boolean extended = definition.isExtended();
        URI classLoaderUri = definition.getClassLoaderId();
        ClassLoader oldCl = Thread.currentThread().getContextClassLoader();
        try {
            // get the classloader for the entity manager factory
            ClassLoader appCl = classLoaderService.getEmfClassLoader(classLoaderUri);
            Thread.currentThread().setContextClassLoader(appCl);
            // eagerly build the the EntityManagerFactory
            emfBuilder.build(unitName, appCl);
            if (definition.isMultiThreaded()) {
                return new MultiThreadedEntityManagerProxyFactory(unitName, extended, emService, tm);
            } else {
                return new StatefulEntityManagerProxyFactory(unitName, extended, emService, tm);
            }
        } finally {
            Thread.currentThread().setContextClassLoader(oldCl);
        }
    }

    public void attachToTarget(PhysicalWireSourceDefinition source, PersistenceContextWireTargetDefinition target, Wire wire) throws WiringException {
        throw new UnsupportedOperationException();
    }

}