restworksession.java

一个工作流设计及定义的系统,可以直接与数据库结合进行系统工作流程的定义及应用.

/*
 * Copyright (c) 2005, John Mettraux, OpenWFE.org
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * 
 * . Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.  
 * 
 * . Redistributions in binary form must reproduce the above copyright notice, 
 *   this list of conditions and the following disclaimer in the documentation 
 *   and/or other materials provided with the distribution.
 * 
 * . Neither the name of the "OpenWFE" nor the names of its contributors may be
 *   used to endorse or promote products derived from this software without
 *   specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * $Id: RestWorkSession.java,v 1.8 2005/05/17 16:41:04 jmettraux Exp $
 */

//
// RestWorkSession.java
//
// [e-mail]
//
// generated with 
// jtmpl 1.0.04 31.10.2002 John Mettraux ([e-mail])
//

package openwfe.org.worklist.impl;

import java.nio.channels.SelectionKey;

import openwfe.org.ServiceException;
import openwfe.org.ApplicationContext;
import openwfe.org.rmi.session.WorkSessionServer;
import openwfe.org.rmi.session.WorkSessionServerImpl;
import openwfe.org.rest.RestUtils;
import openwfe.org.rest.RestService;
import openwfe.org.rest.RmiBridgedRestSession;
import openwfe.org.engine.workitem.LaunchItem;
import openwfe.org.engine.workitem.InFlowWorkItem;
import openwfe.org.engine.workitem.WorkItemCoderLoader;
import openwfe.org.engine.expressions.FlowExpressionId;
import openwfe.org.worklist.Launchable;
import openwfe.org.worklist.WorkSession;
import openwfe.org.worklist.WorkListException;
import openwfe.org.worklist.impl.XmlWorkItemAndHeaderCoder;


/**
 * An association with a rmi worksession
 *
 * <p><font size=2>CVS Info :
 * <br>$Author: jmettraux $
 * <br>$Date: 2005/05/17 16:41:04 $
 * <br>$Id: RestWorkSession.java,v 1.8 2005/05/17 16:41:04 jmettraux Exp $ </font>
 *
 * @author [e-mail]
 */
public class RestWorkSession

    extends RmiBridgedRestSession

{

    private final static org.apache.log4j.Logger log = org.apache.log4j.Logger
        .getLogger(RestWorkSession.class.getName());

    //
    // CONSTANTS and DEFINITIONS

    private final static String E_LAUNCHABLES = "launchables";
    private final static String E_LAUNCHABLE = "launchable";
    private final static String A_ENGINE_ID = "engine-id";
    private final static String A_URL = "url";

    //
    // FIELDS

    private WorkSession session = null;
    private XmlWorkItemAndHeaderCoder coder = null;

    //
    // CONSTRUCTORS

    public void init
        (final RestService service, 
         final Long sessionId, 
         final String username,
         final String password)
    throws
        ServiceException
    {
        super.init(service, sessionId, username, password);

        //
        // locating the coder that will be used
        
        final WorkItemCoderLoader loader = openwfe.org.engine.Definitions
            .getWorkItemCoderLoader(this.service.getContext());

        log.debug("init() loader is "+loader);

        this.coder = (XmlWorkItemAndHeaderCoder)loader.getXmlCoder();

        log.info
            ("HeaderCoder successfully located");
    }

    //
    // METHODS from RestSession

    protected boolean authentify 
        (final String username, final String password)
    throws 
        ServiceException
    {
        try
        {
            this.session = (WorkSession)getWorkSessionServer()
                .login(username, password);
        }
        catch (final Exception e)
        {
            throw new ServiceException("login failed", e);
        }

        return true;
    }

    //
    // METHODS

    //
    // session methods

    public void do_getstorenames
        (final SelectionKey key, final String firstLine, final byte[] request)
    throws 
        Exception
    {
        do_liststores(key, firstLine, request);
    }

    public void do_liststores
        (final SelectionKey key, final String firstLine, final byte[] request)
    throws 
        Exception
    {
        java.util.List storeNames = this.session.getStoreNames();

        org.jdom.Element eStores = new org.jdom.Element("stores");
        
        java.util.Iterator it = storeNames.iterator();
        while (it.hasNext())
        {
            eStores.addContent(buildStoreElement((String)it.next()));
        }

        reply(key, eStores);
    }

    protected org.jdom.Element buildStoreElement (String storeName)
        throws Exception
    {
        int count = 0;
        try
        {
            count = this.session.countWorkItems(storeName);
        }
        catch (java.security.AccessControlException ace)
        {
            // ignore
        }

        String permissionString = "";

        try
        {
            if (this.session.checkPermission(storeName, "read"))
                permissionString += "r";
        }
        catch (java.security.AccessControlException ace)
        {
            // ignore
        }

        try
        {
            if (this.session.checkPermission(storeName, "write"))
                permissionString += "w";
        }
        catch (java.security.AccessControlException ace)
        {
            // ignore
        }

        try
        {
            if (this.session.checkPermission(storeName, "delegate"))
                permissionString += "d";
        }
        catch (java.security.AccessControlException ace)
        {
            // ignore
        }

        try
        {
            if (this.session.checkPermission(storeName, "browse"))
                permissionString += "b";
        }
        catch (java.security.AccessControlException ace)
        {
            // ignore
        }

        org.jdom.Element elt = new org.jdom.Element("store");

        elt.setAttribute("name", storeName);
        elt.setAttribute("workitem-count", ""+count);
        elt.setAttribute("permissions", permissionString);

        return elt;
    }

    public void do_getheaders
        (final SelectionKey key, final String firstLine, final byte[] request)
    throws 
        Exception
    {
        final String storeName = extractStoreName(firstLine);

        int limit = -1;
        try
        {
            limit = Integer.parseInt
                (RestUtils.extractFromLine(firstLine, "limit"));
        }
        catch (Exception e)
        {
            // ignore
        }

        final java.util.List headers = 
            this.session.getHeaders(storeName, limit);

        reply(key, getCoder().encodeHeadersAsXml(headers));
    }

    public void do_findflowinstance
        (final SelectionKey key, final String firstLine, final byte[] request)
    throws 
        Exception
    {
        String storeName = extractStoreName(firstLine);

        String wfid = null;
        try
        {
            wfid = RestUtils.extractFromLine(firstLine, "id");
        }
        catch (Exception e)
        {