com.impetus.kundera.rest.repository.EMRepository Maven / Gradle / Ivy

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/**
 * Copyright 2012 Impetus Infotech.
 *
 * 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 com.impetus.kundera.rest.repository;

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

import javax.persistence.EntityManager;

/**
 * Repository for holding Session Tokens and {@link EntityManager}
 * 
 * @author amresh.singh
 */
public class EMRepository
{

    /** The Constant INSTANCE. */
    public static final EMRepository INSTANCE = new EMRepository();

    private Map emMap;

    /**
     * @return the emMap
     */
    public Map getEmMap()
    {
        return emMap;
    }

    /**
     * Retrieves EM
     * 
     * @param sessionToken
     * @return
     */
    public EntityManager getEM(String sessionToken)
    {
        if (emMap == null)
        {
            return null;
        }
        else
        {
            return emMap.get(sessionToken);
        }
    }

    /**
     * @param emMap
     *            the emMap to set
     */
    public void setEmMap(Map emMap)
    {
        this.emMap = emMap;
    }

    /**
     * Adds EM
     * 
     * @param sessionToken
     * @param em
     */
    public void addEm(String sessionToken, EntityManager em)
    {
        if (emMap == null)
        {
            emMap = new HashMap();
        }
        emMap.put(sessionToken, em);
    }

    /**
     * Removes EM
     * 
     * @param sessionToken
     */
    public void removeEm(String sessionToken)
    {
        if (emMap != null)
        {
            EntityManager em = emMap.get(sessionToken);
            if (em != null)
            {
                em.close();
            }
            emMap.remove(sessionToken);
        }
    }

}