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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2014 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
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 */
package org.glassfish.hk2.xml.internal;

import java.util.concurrent.locks.ReentrantReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock.ReadLock;
import java.util.concurrent.locks.ReentrantReadWriteLock.WriteLock;

import org.glassfish.hk2.api.DynamicConfigurationService;
import org.glassfish.hk2.api.ServiceLocator;
import org.glassfish.hk2.configuration.hub.api.Hub;

/**
 * @author jwells
 *
 */
public class DynamicChangeInfo {
    private final JAUtilities jaUtilities;
    private final ReentrantReadWriteLock treeLock = new ReentrantReadWriteLock();
    private final WriteLock writeTreeLock = treeLock.writeLock();
    private final ReadLock readTreeLock = treeLock.readLock();
    private long changeNumber = 0;
    private final Hub hub;
    private final XmlServiceImpl idGenerator;
    private final DynamicConfigurationService dynamicService;
    private final ServiceLocator locator;
    
    /* package */ DynamicChangeInfo(JAUtilities jaUtilities,
            Hub hub,
            XmlServiceImpl idGenerator,
            DynamicConfigurationService dynamicService,
            ServiceLocator locator) {
        this.jaUtilities = jaUtilities;
        this.hub = hub;
        this.idGenerator = idGenerator;
        this.dynamicService = dynamicService;
        this.locator = locator;
    }
    
    public Hub getHub() {
        return hub;
    }
    
    public ReadLock getReadLock() {
        return readTreeLock;
    }
    
    public WriteLock getWriteLock() {
        return writeTreeLock;
    }
    
    public long getChangeNumber() {
        readTreeLock.lock();
        try {
            return changeNumber;
        }
        finally {
            readTreeLock.unlock();
        }
    }
    
    public void incrementChangeNumber() {
        writeTreeLock.lock();
        try {
            changeNumber++;
        }
        finally {
            writeTreeLock.unlock();
        }
    }
    
    public UnparentedNode getNode(Class iface) {
        return jaUtilities.getNode(iface);
    }
    
    public JAUtilities getJAUtilities() {
        return jaUtilities;
    }
    
    public String getGeneratedId() {
        return idGenerator.getUniqueId();
    }
    
    public XmlServiceImpl getIdGenerator() {
        return idGenerator;
    }
    
    public DynamicConfigurationService getDynamicConfigurationService() {
        return dynamicService;
    }
    
    public ServiceLocator getServiceLocator() {
        return locator;
    }
}