com.liferay.portal.spring.extender.internal.bean.ServiceReferenceAnnotationBeanPostProcessor.java Source code

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Here is the source code for com.liferay.portal.spring.extender.internal.bean.ServiceReferenceAnnotationBeanPostProcessor.java

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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.portal.spring.extender.internal.bean;

import com.liferay.portal.spring.extender.service.ServiceReference;

import java.lang.reflect.Field;

import java.util.HashSet;
import java.util.Set;

import org.osgi.framework.BundleContext;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanCreationException;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextClosedEvent;
import org.springframework.util.ReflectionUtils;

/**
 * @author Miguel Pastor
 */
public class ServiceReferenceAnnotationBeanPostProcessor
        implements ApplicationListener<ContextClosedEvent>, BeanPostProcessor {

    public ServiceReferenceAnnotationBeanPostProcessor(BundleContext bundleContext) {

        _bundleContext = bundleContext;
    }

    @Override
    public void onApplicationEvent(ContextClosedEvent event) {
        for (org.osgi.framework.ServiceReference<?> serviceReference : _serviceReferences) {

            _bundleContext.ungetService(serviceReference);
        }

        _serviceReferences.clear();
    }

    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {

        return bean;
    }

    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {

        autoInject(bean, bean.getClass());

        return bean;
    }

    protected void autoInject(Object targetBean, Class<?> beanClass) {
        if ((beanClass == null) || beanClass.isInterface()) {
            return;
        }

        Field[] fields = beanClass.getDeclaredFields();

        for (Field field : fields) {
            ServiceReference serviceReference = field.getAnnotation(ServiceReference.class);

            if (serviceReference == null) {
                continue;
            }

            org.osgi.framework.ServiceReference<?> osgiServiceReference = null;

            try {
                String filterString = serviceReference.filterString();

                if (filterString.isEmpty()) {
                    Class<?> typeClass = serviceReference.type();

                    osgiServiceReference = _bundleContext.getServiceReference(typeClass.getName());
                } else {
                    Class<?> typeClass = serviceReference.type();

                    org.osgi.framework.ServiceReference<?>[] serviceReferences = _bundleContext
                            .getServiceReferences(typeClass.getName(), filterString);

                    if (serviceReferences != null) {
                        osgiServiceReference = serviceReferences[0];
                    }
                }

                ReflectionUtils.makeAccessible(field);

                field.set(targetBean, _bundleContext.getService(osgiServiceReference));
            } catch (Throwable t) {
                throw new BeanCreationException(beanClass.getName(), "Unable to inject bean reference fields", t);
            }

            _serviceReferences.add(osgiServiceReference);
        }

        autoInject(targetBean, beanClass.getSuperclass());
    }

    private final BundleContext _bundleContext;
    private final Set<org.osgi.framework.ServiceReference<?>> _serviceReferences = new HashSet<>();

}