/**
 * Copyright (C) 2009 eXo Platform SAS.
 *
 * 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.exoplatform.commons.chromattic;

import java.util.HashMap;
import java.util.Map;

import org.exoplatform.container.ExoContainer;
import org.exoplatform.container.component.ComponentPlugin;
import org.exoplatform.container.component.ComponentRequestLifecycle;
import org.exoplatform.services.jcr.RepositoryService;
import org.gatein.common.logging.Logger;
import org.gatein.common.logging.LoggerFactory;

/**
 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
 * @version $Revision$
 */
public class ChromatticManager implements ComponentRequestLifecycle {

    /** . */
    final RepositoryService repositoryService;

    /** . */
    Map<String, String> lifeCycleToWorkspaceMap;

    /** . */
    Map<String, ChromatticLifeCycle> lifeCycles = new HashMap<String, ChromatticLifeCycle>();

    /** . */
    private final ThreadLocal<Synchronization> currentSynchronization = new ThreadLocal<Synchronization>();

    /** . */
    private final Logger log = LoggerFactory.getLogger(ChromatticManager.class);

    public ChromatticManager(RepositoryService repositoryService) throws Exception {
        this.repositoryService = repositoryService;
        this.lifeCycleToWorkspaceMap = new HashMap<String, String>();
    }

    public ChromatticLifeCycle getLifeCycle(String lifeCycleName) {
        return lifeCycles.get(lifeCycleName);
    }

    // Called by kernel
    public void addLifeCycle(ComponentPlugin plugin) {
        ChromatticLifeCycle lifeCycle = (ChromatticLifeCycle) plugin;
        try {
            lifeCycle.manager = this;
            lifeCycle.start();
            lifeCycles.put(lifeCycle.getDomainName(), lifeCycle);
        } catch (Exception e) {
            log.error(e.getMessage(), e);
        }
    }

    public Synchronization getSynchronization() {
        return currentSynchronization.get();
    }

    /**
     * Begins the demarcation of a request and associates the current thread of execution with a context that will provides
     * access to the correct persistence context.
     *
     * @throws IllegalStateException if a request is already associated with this thread
     */
    public void beginRequest() throws IllegalStateException {
        if (currentSynchronization.get() != null) {
            throw new IllegalStateException("Request already started");
        }

        //
        Synchronization sync = new Synchronization();

        //
        currentSynchronization.set(sync);
    }

    /**
     * Ends the demarcation of a request.
     *
     * @param save to save the state
     * @throws IllegalStateException if no request was started previously
     */
    public void endRequest(boolean save) throws IllegalStateException {
        Synchronization sync = currentSynchronization.get();

        // We set null now so it will be properly closed in the PortalSessionLifeCycle logout method
        currentSynchronization.set(null);

        //
        if (sync == null) {
            throw new IllegalStateException("Request not started");
        }

        // Properly close everything
        sync.close(save);

        //
        currentSynchronization.set(null);
    }

    public void startRequest(ExoContainer container) {
        beginRequest();
    }

    public void endRequest(ExoContainer container) {
        Synchronization sync = currentSynchronization.get();
        boolean save = sync.getSaveOnClose();
        endRequest(save);
    }

    public boolean isStarted(ExoContainer container) {
        return currentSynchronization.get() == null ? false : true;
    }
}
