rmiworksession.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: RmiWorkSession.java,v 1.8 2005/06/23 17:39:19 jmettraux Exp $
 */

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

package openwfe.org.worklist.impl;

import java.rmi.RemoteException;
import java.security.PermissionCollection;
import java.security.PrivilegedActionException;
import javax.security.auth.Subject;

import openwfe.org.OpenWfeException;
import openwfe.org.ApplicationContext;
import openwfe.org.auth.PolicyService;
import openwfe.org.engine.workitem.LaunchItem;
import openwfe.org.engine.workitem.InFlowWorkItem;
import openwfe.org.engine.expressions.FlowExpressionId;
import openwfe.org.worklist.Header;
import openwfe.org.worklist.Launchable;
import openwfe.org.worklist.WorkSession;
import openwfe.org.worklist.Definitions;
import openwfe.org.worklist.store.WorkItemStore;
import openwfe.org.worklist.LaunchException;
import openwfe.org.worklist.WorkListException;
import openwfe.org.worklist.auth.LaunchPermission;
import openwfe.org.worklist.auth.DelegationPermission;


/**
 * An implementation of WorkSession based on RMI.
 *
 * <p><font size=2>CVS Info :
 * <br>$Author: jmettraux $
 * <br>$Date: 2005/06/23 17:39:19 $
 * <br>$Id: RmiWorkSession.java,v 1.8 2005/06/23 17:39:19 jmettraux Exp $ </font>
 *
 * @author [e-mail]
 */
public class RmiWorkSession

    extends java.rmi.server.UnicastRemoteObject

    implements WorkSession

{

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

    //
    // FIELDS

    private ApplicationContext applicationContext = null;
    private java.util.Map serviceParams = null;
    private Subject subject = null;

    private java.util.Map ids = new java.util.HashMap(77);

    //
    // CONSTRUCTORS

    /*
     * This constructor must be present to rethrow its super generated 
     * RemoteException.
     */
    public RmiWorkSession ()
        throws RemoteException
    {
        super();
    }

    //
    // METHODS from WorkSession

    //
    // non remote methods

    public void init 
        (final ApplicationContext context, 
         final java.util.Map params, 
         final Subject subject)
    throws 
        RemoteException
    {
        this.applicationContext = context;
        this.serviceParams = params;
        this.subject = subject;
    }

    public Subject getSubject () 
        throws RemoteException
    { 
        return this.subject; 
    }

    public ApplicationContext getApplicationContext ()
    {
        return this.applicationContext;
    }

    //
    // remote methods
    //
    // (a lot of security wrapping)

    /*
     * This first method is unprotected : everybody (if authenticated)
     * may list the storeNames
     */
    public java.util.List getStoreNames ()
        throws RemoteException
    {
        java.util.ArrayList result = new java.util.ArrayList();

        java.util.Iterator it = this.applicationContext.keySet().iterator();
        while (it.hasNext())
        {
            final String serviceName = (String)it.next();

            final Object o = this.applicationContext.lookup(serviceName);

            if (o instanceof WorkItemStore) result.add(serviceName);
        }

        result.trimToSize();

        return result;
    }

    public int countWorkItems (String storeName)
        throws RemoteException, WorkListException
    {
        try
        {
            Object result = Subject.doAs
                (this.subject, 
                 new openwfe.org.wlactions.CountWorkItemsAction
                    (this.applicationContext,
                     this.subject,
                     storeName));

            return ((Integer)result).intValue();
        }
        catch (PrivilegedActionException pae)
        {
            throw (WorkListException)pae.getException();
        }
    }

    public java.util.List findFlowInstance
        (final String storeName, final String workflowInstanceId)
    throws 
        RemoteException, WorkListException
    {
        try
        {
            Object result = Subject.doAs
                (this.subject, 
                 new openwfe.org.wlactions.FindFlowInstanceAction
                    (this.applicationContext,
                     this.subject,
                     storeName,
                     workflowInstanceId));

            final java.util.List feis = (java.util.List)result;

            registerIds(feis);

            return feis;
        }
        catch (PrivilegedActionException pae)
        {
            throw (WorkListException)pae.getException();
        }
    }

    public java.util.List getHeaders 
        (final String storeName, final int limit)
    throws 
        RemoteException, WorkListException
    {
        try
        {
            Object result = Subject.doAs
                (this.subject, 
                 new openwfe.org.wlactions.GetHeadersAction
                    (this.applicationContext,
                     this.subject,
                     storeName,
                     limit,
                     null));

            final java.util.List headers = (java.util.List)result;

            registerIds(headers);

            return headers;
        }
        catch (PrivilegedActionException pae)
        {
            throw (WorkListException)pae.getException();
        }
    }

    public java.util.List getHeaders 
        (final String storeName, 
         final int limit, 
         final java.util.Comparator headerComparator)
    throws 
        RemoteException, WorkListException
    {
        try
        {
            Object result = Subject.doAs
                (this.subject, 
                 new openwfe.org.wlactions.GetHeadersAction
                    (this.applicationContext,
                     this.subject,
                     storeName,
                     limit,
                     headerComparator));

            return (java.util.List)result;
        }
        catch (PrivilegedActionException pae)
        {
            throw (WorkListException)pae.getException();
        }
    }

    public InFlowWorkItem get 
        (final String storeName, final FlowExpressionId fei)
    throws 
        RemoteException, WorkListException
    {
        try
        {
            Object result = Subject.doAs
                (this.subject, 
                 new openwfe.org.wlactions.GetAction
                    (this.applicationContext,
                     this.subject,
                     storeName,
                     fei));

            return (InFlowWorkItem)result;
        }
        catch (PrivilegedActionException pae)
        {
            throw (WorkListException)pae.getException();
        }
    }

    public InFlowWorkItem get 
        (final String storeName, final String id)
    throws 
        RemoteException, WorkListException
    {
        final FlowExpressionId fei = (FlowExpressionId)this.ids.get(id);

        return get(storeName, fei);
    }

    public InFlowWorkItem getAndLock 
        (final String storeName, final FlowExpressionId fei)
    throws 
        RemoteException, WorkListException
    {
        log.debug("getAndLock() storeName >"+storeName+"< fei "+fei);

        try
        {
            Object result = Subject.doAs
                (this.subject, 
                 new openwfe.org.wlactions.GetAndLockAction
                    (this.applicationContext,
                     this.subject,
                     storeName,
                     fei));

            return (InFlowWorkItem)result;
        }
        catch (PrivilegedActionException pae)
        {
            throw (WorkListException)pae.getException();
        }
    }

    public InFlowWorkItem getAndLock 
        (final String storeName, final String id)
    throws