com.imaginea.mongodb.requestdispatchers.UserLogout.java Source code

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Here is the source code for com.imaginea.mongodb.requestdispatchers.UserLogout.java

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/*
 * Copyright (c) 2011 Imaginea Technologies Private Ltd.
 * Hyderabad, India
 * 
 * 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.imaginea.mongodb.requestdispatchers;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.MediaType;

import org.apache.log4j.Logger;
import com.mongodb.Mongo;

/**
 * Listens at a logout Request made by the user and destroys user id from the
 * the mappings in UserLogin class and also from the session. The corresponding
 * mongo instance is also destroyed when all the tokenId corresponding to its
 * user mapping are destroyed.
 * 
 * @author Rachit Mittal
 * @since 11 July 2011
 */

@Path("/logout")
public class UserLogout extends BaseRequestDispatcher {

    private static final long serialVersionUID = 1L;

    /**
     * Define Logger for this class
     */
    private static Logger logger = Logger.getLogger(UserLogout.class);

    /**
     * Listens to a logout reuest made by user to end his session from mViewer.
     * 
     * @param dbInfo
     *            Mongo Db Configuration provided by user to connect to.
     * @return Logout status
     * 
     */
    @GET
    @Produces(MediaType.APPLICATION_JSON)
    public String doGet(@QueryParam("dbInfo") final String dbInfo) {
        String response = ErrorTemplate.execute(logger, new ResponseCallback() {
            public Object execute() throws Exception {
                // Not checking in logout if session has dbInfo or not
                Mongo m = UserLogin.mongoConfigToInstanceMapping.get(dbInfo);
                if (m != null) {
                    int noOfActiveUsers = UserLogin.mongoConfigToUsersMapping.get(dbInfo);
                    if (noOfActiveUsers == 0) {
                        m.close();
                        UserLogin.mongoConfigToInstanceMapping.remove(dbInfo);
                    } else {
                        UserLogin.mongoConfigToUsersMapping.put(dbInfo, noOfActiveUsers - 1);
                    }
                }
                String status = "User Logged Out";
                return status;
            }
        });
        return response;
    }
}