seava.j4e.business.service.ServiceLocatorBusiness.java Source code

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Here is the source code for seava.j4e.business.service.ServiceLocatorBusiness.java

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/** 
 * DNet eBusiness Suite
 * Copyright: 2013 Nan21 Electronics SRL. All rights reserved.
 * Use is subject to license terms.
 */
package seava.j4e.business.service;

import java.util.List;

import seava.j4e.api.Constants;
import seava.j4e.api.exceptions.BusinessException;
import seava.j4e.api.exceptions.ErrorCode;
import seava.j4e.api.service.business.IEntityService;
import seava.j4e.api.service.business.IEntityServiceFactory;

import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

/**
 * Service locator utility methods.
 * 
 * @author amathe
 */
public class ServiceLocatorBusiness implements ApplicationContextAware {

    private ApplicationContext applicationContext;

    private List<IEntityServiceFactory> entityServiceFactories;

    /**
     * Find an entity service given the entity class.
     * 
     * @param <E>
     * @param entityClass
     * @return
     * @throws BusinessException
     */
    public <E> IEntityService<E> findEntityService(Class<E> entityClass) throws BusinessException {
        return this.findEntityService(entityClass, this.getEntityServiceFactories());
    }

    /**
     * Find an entity service given the entity class and a list of factories.
     * 
     * @param <E>
     * @param entityClass
     * @param factories
     * @return
     * @throws BusinessException
     */
    public <E> IEntityService<E> findEntityService(Class<E> entityClass, List<IEntityServiceFactory> factories)
            throws BusinessException {
        for (IEntityServiceFactory esf : factories) {
            try {
                IEntityService<E> srv = esf.create(entityClass.getSimpleName());
                if (srv != null) {
                    return srv;
                }
            } catch (NoSuchBeanDefinitionException e) {
                // service not found in this factory, ignore
            }
        }
        throw new BusinessException(ErrorCode.G_RUNTIME_ERROR,
                entityClass.getSimpleName() + "Service" + " not found ");
    }

    /**
     * Get entity service factories. If it is null attempts to retrieve it from
     * Spring context by <code>osgiEntityServiceFactories</code> alias.
     * 
     * @return
     */
    @SuppressWarnings("unchecked")
    public List<IEntityServiceFactory> getEntityServiceFactories() {
        if (this.entityServiceFactories == null) {
            this.entityServiceFactories = (List<IEntityServiceFactory>) this.getApplicationContext()
                    .getBean(Constants.SPRING_OSGI_ENTITY_SERVICE_FACTORIES);
        }
        return this.entityServiceFactories;
    }

    /**
     * Set entity service factories
     * 
     * @param entityServiceFactories
     */
    public void setEntityServiceFactories(List<IEntityServiceFactory> entityServiceFactories) {
        this.entityServiceFactories = entityServiceFactories;
    }

    /**
     * Getter for the spring application context.
     * 
     * @return
     */
    public ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    /**
     * Setter for the spring application context.
     */
    public void setApplicationContext(ApplicationContext applicationContext) {
        this.applicationContext = applicationContext;
    }
}