org.tinymediamanager.core.TmmModuleManager.java Source code

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Here is the source code for org.tinymediamanager.core.TmmModuleManager.java

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/*
 * Copyright 2012 - 2015 Manuel Laggner
 *
 * 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.
 */
package org.tinymediamanager.core;

import java.io.File;
import java.util.LinkedHashSet;
import java.util.Set;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.PersistenceException;

import org.apache.commons.io.FileUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * The class TmmModuleManager. Used to manage all modules inside tmm
 * 
 * @author Manuel Laggner
 */
public class TmmModuleManager {
    private static final Logger LOGGER = LoggerFactory.getLogger(TmmModuleManager.class);
    private static final String TMM_DB = "tmm.odb";
    private static TmmModuleManager instance;

    private EntityManager entityManager;
    private Set<ITmmModule> modules;

    private TmmModuleManager() {
        modules = new LinkedHashSet<ITmmModule>();
    }

    public static TmmModuleManager getInstance() {
        if (instance == null) {
            instance = new TmmModuleManager();
        }
        return instance;
    }

    public void registerModule(ITmmModule module) {
        modules.add(module);
    }

    public void enableModule(ITmmModule module) throws Exception {
        if (!modules.contains(module)) {
            throw new Exception("module " + module.getModuleTitle() + " not registered");
        }

        module.startUp();
    }

    public void disableModule(ITmmModule module) throws Exception {
        if (!modules.contains(module)) {
            throw new Exception("module " + module.getModuleTitle() + " not registered");
        }

        module.shutDown();
    }

    /**
     * start up tmm - do initialization code here
     */
    public void startUp() {
        // enhance if needed
        if (System.getProperty("tmmenhancer") != null) {
            // changed enhancer to be in sync with the build.xml
            com.objectdb.Enhancer.enhance("-s org.tinymediamanager.core.*");
            // com.objectdb.Enhancer.enhance("org.tinymediamanager.core.entities.*");
            // com.objectdb.Enhancer.enhance("org.tinymediamanager.core.movie.entities.*");
            // com.objectdb.Enhancer.enhance("org.tinymediamanager.core.tvshow.entities.*");
            // com.objectdb.Enhancer.enhance("org.tinymediamanager.scraper.MediaTrailer");
        }

        // get a connection to the database
        EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory(TMM_DB);
        try {
            entityManager = entityManagerFactory.createEntityManager();
        } catch (PersistenceException e) {
            if (e.getCause().getMessage().contains("does not match db file")) {
                // happens when there's a recovery file which does not match (cannot be recovered) - just delete and try again
                FileUtils.deleteQuietly(new File(TMM_DB + "$"));
                entityManager = entityManagerFactory.createEntityManager();
            } else {
                // unknown
                throw (e);
            }
        }
    }

    /**
     * shutdown tmm - forces all registered modules to shut down
     */
    public void shutDown() {
        for (ITmmModule module : modules) {
            if (module.isEnabled()) {
                try {
                    module.shutDown();
                } catch (Exception e) {
                    LOGGER.error("problem shutting down " + module.getModuleTitle() + ": " + e.getMessage());
                }
            }
        }

        try {
            EntityManagerFactory emf = entityManager.getEntityManagerFactory();
            entityManager.close();
            emf.close();
        } catch (Exception e) {
        }
    }

    public EntityManager getEntityManager() {
        return entityManager;
    }
}