com.viaoa.web.OASystem Maven / Gradle / Ivy

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/*  Copyright 1999-2015 Vince Via [email protected]
    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.viaoa.web;

import java.io.*;
import javax.servlet.ServletContext;

/**
 * Top component used for managing web server, others include application, user sesssion, page/form.
 * @author vvia
 *
 */
public class OASystem extends OABase implements Serializable {
    private static final long serialVersionUID = 1L;

    public OASystem() {
    }

    
    public OAApplication getApplication(String applicationName, ServletContext application) {
        OAApplication oaapplication = (OAApplication) application.getAttribute(applicationName+".OA");
        if (oaapplication == null) {
            synchronized(application) {
                oaapplication = (OAApplication) application.getAttribute(applicationName+".OA");
                if (oaapplication == null) {
                    System.out.println("OASystem.getApplication() ... creating new OAApplication "+applicationName);
                    oaapplication = new OAApplication();
                    oaapplication.setName(applicationName);
                    application.setAttribute(applicationName+".OA", oaapplication);
                }
            }
        }
        return oaapplication;
    }

}