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XWiki Commons - Script

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/*
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This 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 software 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.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.xwiki.script.internal.service;

import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Provider;
import javax.inject.Singleton;

import org.slf4j.Logger;
import org.xwiki.component.annotation.Component;
import org.xwiki.component.manager.ComponentManager;
import org.xwiki.script.service.ScriptService;
import org.xwiki.script.service.ScriptServiceManager;

/**
 * Locate Script Services by name dynamically at runtime by looking them up agains the Component Manager.
 *
 * @version $Id: 8723715e20d8e34766f6a503e54a9e52209dccb2 $
 * @since 2.3M1
 */
@Component
@Singleton
public class DefaultScriptServiceManager implements ScriptServiceManager
{
    /**
     * Used to locate Script Services dynamically. Note that since the lookup is done dynamically new Script Services
     * can be added on the fly in the classloader and they'll be found (after they've been registered against the
     * component manager obviously).
     */
    @Inject
    @Named("context")
    private Provider componentManager;

    /**
     * The logger to log.
     */
    @Inject
    private Logger logger;

    @Override
    public ScriptService get(String serviceName)
    {
        ScriptService scriptService = null;

        if (this.componentManager.get().hasComponent(ScriptService.class, serviceName)) {
            try {
                scriptService = this.componentManager.get().getInstance(ScriptService.class, serviceName);
            } catch (Exception e) {
                this.logger.error("Failed to lookup script service for role hint [{}]", serviceName, e);
            }
        } else {
            this.logger.debug("No script service registered for role hint [{}]", serviceName);
        }

        return scriptService;
    }
}