com.heliumv.factory.BaseCall.java Source code

Introduction

Here is the source code for com.heliumv.factory.BaseCall.java

Source

/*******************************************************************************
 * HELIUM V, Open Source ERP software for sustained success
 * at small and medium-sized enterprises.
 * Copyright (C) 2004 - 2014 HELIUM V IT-Solutions GmbH
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published 
 * by the Free Software Foundation, either version 3 of theLicense, or 
 * (at your option) any later version.
 * 
 * According to sec. 7 of the GNU Affero General Public License, version 3, 
 * the terms of the AGPL are supplemented with the following terms:
 * 
 * "HELIUM V" and "HELIUM 5" are registered trademarks of 
 * HELIUM V IT-Solutions GmbH. The licensing of the program under the 
 * AGPL does not imply a trademark license. Therefore any rights, title and
 * interest in our trademarks remain entirely with us. If you want to propagate
 * modified versions of the Program under the name "HELIUM V" or "HELIUM 5",
 * you may only do so if you have a written permission by HELIUM V IT-Solutions 
 * GmbH (to acquire a permission please contact HELIUM V IT-Solutions
 * at trademark@heliumv.com).
 * 
 * This program 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 Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * Contact: developers@heliumv.com
 ******************************************************************************/
package com.heliumv.factory;

import java.util.Hashtable;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;

import com.heliumv.tools.UncheckedCasts;

public class BaseCall<T> implements IBaseCallBeans {
    private static Logger log = LoggerFactory.getLogger(BaseCall.class);

    private Context context = null;
    private T callFac = null;
    private String beanName = null;

    @Autowired
    private BaseCallRegistrant baseCallRegistrant;

    protected BaseCall(String beanName) {
        if (null == beanName || beanName.trim().length() == 0)
            throw new IllegalArgumentException("beanName == null or empty");
        this.beanName = beanName;
    }

    private String getServerBeanName(String beanName) {
        return "lpserver/" + beanName + "/remote";
    }

    public String getBeanName() {
        return beanName;
    }

    public void clear() {
        callFac = null;
    }

    /*
     * Die Settings sind in der web.xml abgelegt. Beispiel:
     * 
     * <web-app>
     *   <env-entry>
     *      <env-entry-name>java.naming.provider.url</env-entry-name>
     *      <env-entry-type>java.lang.String</env-entry-type>
     *      <env-entry-value>jnp://localhost:2099</env-entry-value>
     *   </env-entry>
     *   <env-entry>
     *      <env-entry-name>java.naming.factory.initial</env-entry-name>
     *      <env-entry-type>java.lang.String</env-entry-type>
     *      <env-entry-value>org.jnp.interfaces.NamingContextFactory</env-entry-value>
     *   </env-entry>
     * </web-app>
     */
    private Context getInitialContext() throws NamingException {
        Context env = (Context) new InitialContext().lookup("java:comp/env");
        String namingFactory = (String) env.lookup(Context.INITIAL_CONTEXT_FACTORY);
        String urlProvider = (String) env.lookup(Context.PROVIDER_URL);

        log.debug("namingFactory = {" + namingFactory + "}");
        log.debug("urlProvider = {" + urlProvider + "}");

        Hashtable<String, String> environment = new Hashtable<String, String>();

        environment.put(Context.INITIAL_CONTEXT_FACTORY, namingFactory);
        environment.put(Context.PROVIDER_URL, urlProvider);
        return new InitialContext(environment);
    }

    protected T getFac() throws NamingException {
        if (callFac == null) {
            context = getInitialContext();
            callFac = UncheckedCasts.cast(context.lookup(getServerBeanName(beanName)));

            baseCallRegistrant.register(this);
        }

        return callFac;
    }
}