Source Code Cross Referenced for SimpleApplicationAgent.java in  » Workflow-Engines » wfmopen-2.1.1 » de » danet » an » workflow » tools » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Workflow Engines » wfmopen 2.1.1 » de.danet.an.workflow.tools.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * This file is part of the WfMOpen project.
003:         * Copyright (C) 2001-2004 Danet GmbH (www.danet.de), GS-AN.
004:         * All rights reserved.
005:         *
006:         * This program is free software; you can redistribute it and/or modify
007:         * it under the terms of the GNU General Public License as published by
008:         * the Free Software Foundation; either version 2 of the License, or
009:         * (at your option) any later version.
010:         *
011:         * This program is distributed in the hope that it will be useful,
012:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
014:         * GNU General Public License for more details.
015:         *
016:         * You should have received a copy of the GNU General Public License
017:         * along with this program; if not, write to the Free Software
018:         * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
019:         *
020:         * $Id: SimpleApplicationAgent.java,v 1.2 2006/09/29 12:32:09 drmlipp Exp $
021:         *
022:         * $Log: SimpleApplicationAgent.java,v $
023:         * Revision 1.2  2006/09/29 12:32:09  drmlipp
024:         * Consistently using WfMOpen as projct name now.
025:         *
026:         * Revision 1.1.1.1  2004/08/18 15:17:39  drmlipp
027:         * Update to 1.2
028:         *
029:         * Revision 1.2  2004/04/08 09:34:54  lipp
030:         * Clarified documentation of package structure.
031:         *
032:         * Revision 1.1  2004/02/19 17:55:54  lipp
033:         * Initial version of waittool.
034:         *
035:         */
036:        package de.danet.an.workflow.tools.util;
037:
038:        import java.rmi.RemoteException;
039:
040:        import de.danet.an.util.EJBUtil;
041:        import de.danet.an.util.ResourceNotAvailableException;
042:
043:        import de.danet.an.workflow.api.Activity;
044:        import de.danet.an.workflow.api.ActivityUniqueKey;
045:        import de.danet.an.workflow.api.InvalidKeyException;
046:
047:        import de.danet.an.workflow.spis.aii.ApplicationNotStoppedException;
048:        import de.danet.an.workflow.spis.aii.ToolAgent;
049:
050:        /**
051:         * This is a base class for writing agents for applications that have
052:         * a life cycle exceeding a single tool agent invocation, and have only
053:         * state information that can efficiently be persisted as a binary
054:         * large object in an RDBMs.<P>
055:         *
056:         * An example for such an application is the wait tool (see <i>User
057:         * Manual</i>). A wait tool (or "wait application") is created by one
058:         * tool agent invocation.  Then another tool agent invocation waits
059:         * for the completion of the wait, while yet another tool agent
060:         * invocation may cause the wait tool to complete prematurely. The
061:         * wait tool has state that is controlled by the tool agents and a
062:         * timer provided by the enviroment. Its state is therefore completely
063:         * serializable (no open sockets, tool controlled threads etc.).<P>
064:         *
065:         * This base class mainly provides access to the {@link
066:         * SimpleApplicationDirectory application directory} that does all the
067:         * important work.
068:         *
069:         * @author <a href="mailto:lipp@danet.de">Michael Lipp</a>
070:         * @version $Revision: 1.2 $
071:         */
072:
073:        public abstract class SimpleApplicationAgent implements  ToolAgent {
074:
075:            private static final org.apache.commons.logging.Log logger = org.apache.commons.logging.LogFactory
076:                    .getLog(SimpleApplicationAgent.class);
077:
078:            /** Application directory. */
079:            private SimpleApplicationDirectoryLocal applDirCache = null;
080:
081:            /**
082:             * Creates an instance of <code>SimpleApplicationAgent</code>
083:             * with all attributes initialized to default values.
084:             */
085:            public SimpleApplicationAgent() {
086:            }
087:
088:            /**
089:             * Return the application directory.
090:             * @return the application directory
091:             * @throws ResourceNotAvailableException if an application
092:             * directory EJB cannot be instantiated
093:             */
094:            protected SimpleApplicationDirectoryLocal applicationDirectory()
095:                    throws ResourceNotAvailableException {
096:                if (applDirCache == null) {
097:                    applDirCache = (SimpleApplicationDirectoryLocal) EJBUtil
098:                            .createSession(
099:                                    SimpleApplicationDirectoryLocalHome.class,
100:                                    "java:comp/env/ejb/SimpleApplicationDirectoryLocal");
101:                }
102:                return applDirCache;
103:            }
104:
105:            /**
106:             * Terminates execution of the given activity. This base
107:             * implementation simply removes the application instance fom the
108:             * application directory.
109:             *
110:             * @param activity the activity to be canceled
111:             * @throws ApplicationNotStoppedException if execution cannot be
112:             * terminated (see {@link ApplicationNotStoppedException
113:             * <code>ApplicationNotStoppedException</code>}).
114:             * workflow engine should retry the tool invocation
115:             * @throws RemoteException if a temporary problem occurs and the
116:             * workflow engine should retry the tool invocation
117:             */
118:            public void terminate(Activity activity)
119:                    throws ApplicationNotStoppedException, RemoteException {
120:                ActivityUniqueKey auk = null;
121:                try {
122:                    auk = activity.uniqueKey();
123:                    SimpleApplicationInfo info = applicationDirectory()
124:                            .infoByActivity(auk);
125:                    applicationDirectory().removeInstance(info.id());
126:                } catch (InvalidKeyException e) {
127:                    logger.debug("No application instance for " + auk
128:                            + " already removed(?): " + e.getMessage());
129:                }
130:            }
131:        }
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