containerloader.java

Sequoia ERP是一个真正的企业级开源ERP解决方案。它提供的模块包括：电子商务应用(e-commerce), POS系统(point of sales),知识管理,存货与仓库管理

/*
 * $Id: ContainerLoader.java 5462 2005-08-05 18:35:48Z jonesde $
 *
 * Copyright (c) 2003 The Open For Business Project - www.ofbiz.org
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
 * OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */
package org.ofbiz.base.container;

import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

import org.ofbiz.base.start.StartupException;
import org.ofbiz.base.start.StartupLoader;
import org.ofbiz.base.start.Start;
import org.ofbiz.base.util.Debug;

/**
 * ContainerLoader - StartupLoader for the container
 *
 * @author     <a href="mailto:[e-mail]">Andy Zeneski</a> 
  *@version    $Rev: 5462 $
 * @since      3.0
 */
public class ContainerLoader implements StartupLoader {
    
    public static final String module = ContainerLoader.class.getName();
    public static final String CONTAINER_CONFIG = "ofbiz-containers.xml";
    private static boolean loaded = false;

    protected List loadedContainers = new LinkedList();
    protected String configFile = null;

    /**
     * @see org.ofbiz.base.start.StartupLoader#load(Start.Config, String[])
     */
    public void load(Start.Config config, String args[]) throws StartupException {
        Debug.logInfo("[Startup] Loading containers...", module);
        loaded = true;
        
        // get the master container configuration file
        this.configFile = config.containerConfig;
        
        Collection containers = null;
        try {
            containers = ContainerConfig.getContainers(configFile);
        } catch (ContainerException e) {            
            throw new StartupException(e);
        }

        if (containers != null) {
            Iterator i = containers.iterator();
            while (i.hasNext()) {
                ContainerConfig.Container containerCfg = (ContainerConfig.Container) i.next();                
                loadedContainers.add(loadContainer(containerCfg, args));
            }
        }
    }

    /**
     * @see org.ofbiz.base.start.StartupLoader#start()
     */
    public void start() throws StartupException {
        Debug.logInfo("[Startup] Starting containers...", module);

        // start each container object
        for (int i = 0; i < loadedContainers.size(); i++) {
            Container container = (Container) loadedContainers.get(i);
            try {
                container.start();
            } catch (ContainerException e) {
                throw new StartupException("Cannot start() " + container.getClass().getName(), e);
            } catch (java.lang.AbstractMethodError e) {
                throw new StartupException("Cannot start() " + container.getClass().getName(), e);
            }
        }
    }

    /**
     * @see org.ofbiz.base.start.StartupLoader#unload()
     */
    public void unload() throws StartupException {
        Debug.logInfo("Shutting down containers", module);

        // shutting down in reverse order
        for (int i = loadedContainers.size(); i > 0; i--) {
            Container container = (Container) loadedContainers.get(i-1);
            try {
                container.stop();
            } catch (ContainerException e) {
                Debug.logError(e, module);
            }
        }
    }

    private Container loadContainer(ContainerConfig.Container containerCfg, String[] args) throws StartupException {
        // load the container class
        ClassLoader loader = Thread.currentThread().getContextClassLoader();
        if (loader == null) {
            Debug.logWarning("Unable to get context classloader; using system", module);
            loader = ClassLoader.getSystemClassLoader();
        }
        Class containerClass = null;
        try {
            containerClass = loader.loadClass(containerCfg.className);
        } catch (ClassNotFoundException e) {
            throw new StartupException("Cannot locate container class", e);            
        }
        if (containerClass == null) {
            throw new StartupException("Component container class not loaded");
        }

        // create a new instance of the container object
        Container containerObj = null;
        try {
            containerObj = (Container) containerClass.newInstance();
        } catch (InstantiationException e) {
            throw new StartupException("Cannot create " + containerCfg.name, e);
        } catch (IllegalAccessException e) {
            throw new StartupException("Cannot create " + containerCfg.name, e);
        } catch (ClassCastException e) {
            throw new StartupException("Cannot create " + containerCfg.name, e);
        }
        
        if (containerObj == null) {
            throw new StartupException("Unable to create instance of component container");
        }

        // initialize the container object
        try {
            containerObj.init(args, configFile);
        } catch (ContainerException e) {
            throw new StartupException("Cannot init() " + containerCfg.name, e);
        } catch (java.lang.AbstractMethodError e) {
            throw new StartupException("Cannot init() " + containerCfg.name, e);
        }

        return containerObj;
    }

    public static synchronized boolean loadContainers(String config, String[] args) throws StartupException {
        if (!loaded) {
            ContainerLoader loader = new ContainerLoader();
            Start.Config cfg = new Start.Config();
            cfg.containerConfig = config == null ? "limited-containers.xml" : config;
            loader.load(cfg, args);
            return true;
        }
        return false;
    }
}