filedispatcher.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: FileDispatcher.java,v 1.4 2005/05/17 16:40:26 jmettraux Exp $
 */

//
// FileDispatcher.java
//
// [e-mail]
//
// generated with 
// jtmpl 1.0.04 20.11.2001 John Mettraux ([e-mail])
//

package openwfe.org.engine.impl.dispatch;

import openwfe.org.ServiceException;
import openwfe.org.ApplicationContext;
import openwfe.org.time.Time;
import openwfe.org.engine.workitem.WorkItem;
import openwfe.org.engine.workitem.LaunchItem;
import openwfe.org.engine.workitem.InFlowWorkItem;
import openwfe.org.engine.workitem.WorkItemCoder;
import openwfe.org.engine.dispatch.DispatchingException;
import openwfe.org.engine.dispatch.AbstractWorkItemDispatcher;
import openwfe.org.engine.expressions.FlowExpressionId;


/**
 * A very simple dispatcher, dispatches to a directory
 *
 * <p><font size=2>CVS Info :
 * <br>$Author: jmettraux $
 * <br>$Date: 2005/05/17 16:40:26 $
 * <br>$Id: FileDispatcher.java,v 1.4 2005/05/17 16:40:26 jmettraux Exp $ </font>
 *
 * @author [e-mail]
 */
public class FileDispatcher

    extends AbstractWorkItemDispatcher

{

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

    //
    // CONSTANTS (definitions)

    public final static String DIRECTORY 
        = "directory";

    //
    // FIELDS

    private String directory = null;

    //
    // CONSTRUCTORS

    public void init 
        (final String serviceName, 
         final ApplicationContext context, 
         final java.util.Map serviceParams)
    throws 
        ServiceException
    {
        super.init(serviceName, context, serviceParams);

        this.directory = 
            (String)serviceParams.get(DIRECTORY);

        if ( ! this.directory.startsWith(java.io.File.separator))
            this.directory = context.getApplicationDirectory()+this.directory;

        if (! this.directory.endsWith(java.io.File.separator))
            this.directory += java.io.File.separator;
    }

    //
    // METHODS

    public Object dispatch (WorkItem wi)
        throws DispatchingException
    {
        //
        // determine file name
        
        String fileName = null;

        if (wi instanceof InFlowWorkItem)
        {
            FlowExpressionId id = ((InFlowWorkItem)wi).getLastExpressionId();
            
            fileName = 
                this.directory+
                id.getWorkflowDefinitionName()+"--"+
                id.getWorkflowDefinitionRevision()+"--"+
                id.getWorkflowInstanceId()+"--"+
                id.getExpressionName()+"--"+
                id.getExpressionId()+
                ".xml";
        }

        if (wi instanceof LaunchItem)
        {
            LaunchItem li = (LaunchItem)wi;

            int i = 0;
            while (true)
            {
                fileName =
                    this.directory+
                    "launch-item--"+
                    i+
                    ".xml";

                if ((new java.io.File(fileName)).exists())
                {
                    i++;
                    continue;
                }

                break;
            }
        }

        //
        // store
        
        try
        {
            WorkItemCoder coder = instantiateEncoder();

            java.io.FileOutputStream fos = 
                new java.io.FileOutputStream(fileName);

            if (wi instanceof InFlowWorkItem)
            {
                ((InFlowWorkItem)wi)
                    .setDispatchTime(Time.toIsoDate());
            }

            byte[] encodedWorkItem = (byte[])coder
                .encode(wi, getContext(), getParams());

            fos.write(encodedWorkItem);

            fos.flush();
            fos.close();
        }
        catch (Exception e)
        {
            throw new DispatchingException
                ("Dispatching failed for "+wi.toString(), e);
        }

        return null;
    }

}