Source Code Cross Referenced for ProcBasedImpl.java in  » Workflow-Engines » wfmopen-2.1.1 » de » danet » an » workflow » domain » 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.domain 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * This file is part of the WfMOpen project.
003:         * Copyright (C) 2001-2003 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: ProcBasedImpl.java,v 1.6 2007/05/03 21:58:18 mlipp Exp $
021:         *
022:         * $Log: ProcBasedImpl.java,v $
023:         * Revision 1.6  2007/05/03 21:58:18  mlipp
024:         * Internal refactoring for making better use of local EJBs.
025:         *
026:         */
027:        package de.danet.an.workflow.domain;
028:
029:        import java.util.ArrayList;
030:        import java.util.List;
031:        import java.util.Map;
032:
033:        import org.xml.sax.Attributes;
034:        import org.xml.sax.SAXException;
035:
036:        import de.danet.an.util.sax.StackedHandler;
037:
038:        import de.danet.an.workflow.internalapi.ExtActivityLocal;
039:        import de.danet.an.workflow.internalapi.ExtProcessLocal;
040:        import de.danet.an.workflow.localapi.ActivityLocal;
041:        import de.danet.an.workflow.localapi.ProcessLocal;
042:        import de.danet.an.workflow.localapi.ProcessDefinitionDirectoryLocal;
043:        import de.danet.an.workflow.localcoreapi.WfProcessLocal;
044:        import de.danet.an.workflow.omgcore.AlreadyRunningException;
045:        import de.danet.an.workflow.omgcore.CannotCompleteException;
046:        import de.danet.an.workflow.omgcore.CannotStartException;
047:        import de.danet.an.workflow.omgcore.CannotStopException;
048:        import de.danet.an.workflow.omgcore.InvalidDataException;
049:        import de.danet.an.workflow.omgcore.InvalidRequesterException;
050:        import de.danet.an.workflow.omgcore.NotEnabledException;
051:        import de.danet.an.workflow.omgcore.NotRunningException;
052:        import de.danet.an.workflow.omgcore.ProcessData;
053:        import de.danet.an.workflow.omgcore.RequesterRequiredException;
054:        import de.danet.an.workflow.omgcore.UpdateNotAllowedException;
055:        import de.danet.an.workflow.omgcore.WfRequester;
056:
057:        import de.danet.an.workflow.api.DefaultProcessData;
058:        import de.danet.an.workflow.api.FormalParameter;
059:        import de.danet.an.workflow.api.InvalidKeyException;
060:        import de.danet.an.workflow.api.ProcessDefinition;
061:        import de.danet.an.workflow.api.Activity.SubFlowImplementation;
062:
063:        /**
064:         * This class represents a sub-process based activity implementation,
065:         * i.e. it implements {@link
066:         * de.danet.an.workflow.localapi.ActivityLocal.SubFlowImplementation
067:         * <code>SubFlowImplementation</code>}.
068:         *
069:         * @author <a href="mailto:mnl@mnl.de">Michael N. Lipp</a>
070:         * @version $Revision: 1.6 $
071:         */
072:        public final class ProcBasedImpl extends ActImplBase implements 
073:                SubFlowImplementation {
074:
075:            /** Unique id. */
076:            static final long serialVersionUID = 5223962486120295143L;
077:
078:            private static final org.apache.commons.logging.Log logger = org.apache.commons.logging.LogFactory
079:                    .getLog(ProcBasedImpl.class);
080:
081:            private String packageId;
082:            private String processId;
083:            private int execMode = SYNCHR;
084:
085:            /** The actual parameters. */
086:            private Object[] actualParams = null;
087:
088:            private String startedProcess = null;
089:
090:            /**
091:             * Creates an instance of <code>ProcBasedImpl</code>
092:             * with all attributes initialized to default values.
093:             */
094:            private ProcBasedImpl() {
095:            }
096:
097:            /* Comment copied from interface. */
098:            public String packageId() {
099:                return packageId;
100:            }
101:
102:            /* Comment copied from interface. */
103:            public String processId() {
104:                return processId;
105:            }
106:
107:            /* Comment copied from interface. */
108:            public String processKey() {
109:                return startedProcess;
110:            }
111:
112:            /** 
113:             * The key is not persisted persisted here. Rather it is part of the
114:             * persistent state of the invoking activity and restored when the
115:             * implementation is retrieved. 
116:             */
117:            public void setProcessKey(String key) {
118:                startedProcess = key;
119:            }
120:
121:            /**
122:             * Return the actual parameters.
123:             * @return actualParameters.
124:             */
125:            public Object[] actualParameters() {
126:                return actualParams;
127:            }
128:
129:            /* Comment copied from interface. */
130:            public int execution() {
131:                return execMode;
132:            }
133:
134:            /**
135:             * Triggers the execution of a subprocess for the given activity.
136:             * @param act the activity
137:             */
138:            public void invoke(ExtActivityLocal act) {
139:                try {
140:                    try {
141:                        ExtProcessLocal process = (ExtProcessLocal) act
142:                                .containerLocal();
143:                        ProcessDefinitionDirectoryLocal pdd = (ProcessDefinitionDirectoryLocal) process
144:                                .processDefinitionDirectoryLocal();
145:                        WfRequester req = new SubProcRequester(act, execMode);
146:                        ProcessData pd = new DefaultProcessData(parameterMap(
147:                                process, act, pdd));
148:                        WfProcessLocal p = pdd.createProcessLocal(packageId(),
149:                                processId(), req);
150:                        p.setProcessContext(pd);
151:                        p.start();
152:                        startedProcess = p.key();
153:                        if (execMode == ASYNCHR) {
154:                            act.complete();
155:                        }
156:                    } catch (InvalidDataException e) {
157:                        act.terminate();
158:                    } catch (UpdateNotAllowedException e) {
159:                        act.terminate();
160:                    } catch (AlreadyRunningException e) {
161:                        act.terminate();
162:                    } catch (CannotStartException e) {
163:                        act.terminate();
164:                    } catch (NotEnabledException e) {
165:                        act.terminate();
166:                    } catch (InvalidKeyException e) {
167:                        act.terminate();
168:                    } catch (InvalidRequesterException e) {
169:                        act.terminate();
170:                    } catch (RequesterRequiredException e) {
171:                        act.terminate();
172:                    } catch (CannotCompleteException e) {
173:                        act.terminate();
174:                    }
175:                    return;
176:                } catch (NotRunningException e) {
177:                    // cannot happen
178:                    logger.error(e.getMessage(), e);
179:                } catch (CannotStopException e) {
180:                    // cannot happen
181:                    logger.error(e.getMessage(), e);
182:                }
183:            }
184:
185:            /**
186:             * Create the parameter map for sub-process based on the
187:             * activity's context, the formal parameters of the sub-process
188:             * and the values of the actual parameters.<P>
189:             *
190:             * Note that all parameters could be derived from the activity.
191:             * This method is intended to be used in cases where the additional
192:             * parameters are available anyway.
193:             *
194:             * @param process the containing process
195:             * @param act the activity to which this tool implementation description
196:             * is to be applied
197:             * @param pdd the process definition directory
198:             * @return the parameter map
199:             */
200:            public Map parameterMap(ExtProcessLocal process, ActivityLocal act,
201:                    ProcessDefinitionDirectoryLocal pdd) {
202:                try {
203:                    ProcessDefinition pd = pdd.lookupProcessDefinition(
204:                            packageId(), processId());
205:                    FormalParameter[] fps = pd.formalParameters();
206:                    return parameterMap(process, act, fps);
207:                } catch (InvalidKeyException e) {
208:                    // cannot happen since procdef is initially verified
209:                    logger.error(e.getMessage(), e);
210:                    throw new IllegalStateException(e.getMessage());
211:                }
212:            }
213:
214:            /**
215:             * Merge the result returned by an implementation into the process
216:             * data. The names of the result data items must be formal parameter
217:             * names which are mapped to process data items as defined by the
218:             * actual parameters.
219:             *
220:             * @param act the activity related with the implementation invocation.
221:             * @param result the result data.
222:             * @throws InvalidDataException if the entries in the result do not
223:             * match formal parameter names or excessive entries exist.
224:             */
225:            public void mergeResult(ActivityLocal act, Map result)
226:                    throws InvalidDataException {
227:                if (!(result instanceof  ProcessDataWithParams)) {
228:                    throw new InvalidDataException("Need ProcDataWithParams");
229:                }
230:                ProcessLocal process = (ProcessLocal) act.containerLocal();
231:                FormalParameter[] fps = ((ProcessDataWithParams) result)
232:                        .formalParameters();
233:                mergeResult(process, fps, result);
234:            }
235:
236:            /**
237:             * Return a string representation of this object.
238:             * @return the representation
239:             */
240:            public String toString() {
241:                return "Process[" + packageId() + "/" + processId() + "]";
242:            }
243:
244:            /**
245:             * Helper class for retrieving the tool based implementation from
246:             * the process definition.
247:             */
248:            public class SAXInitializer extends StackedHandler {
249:
250:                private List apList = new ArrayList();
251:
252:                /**
253:                 * Receive notification of the beginning of an element.
254:                 *
255:                 * @param uri the Namespace URI, or the empty string if the
256:                 * element has no Namespace URI or if Namespace processing is not
257:                 * being performed.
258:                 * @param loc the local name (without prefix), or the empty string
259:                 * if Namespace processing is not being performed.
260:                 * @param raw the raw XML 1.0 name (with prefix), or the empty
261:                 * string if raw names are not available.
262:                 * @param a the attributes attached to the element. If there are
263:                 * no attributes, it shall be an empty Attributes object.
264:                 * @throws SAXException not thrown.
265:                 */
266:                public void startElement(String uri, String loc, String raw,
267:                        Attributes a) throws SAXException {
268:                    if (loc.equals("SubFlow")) {
269:                        setContextData("implementation", ProcBasedImpl.this );
270:                        packageId = (String) getContextData("packageId");
271:                        processId = a.getValue("Id");
272:                        if (logger.isDebugEnabled()) {
273:                            logger.debug("Creating sub flow invocation for: "
274:                                    + packageId + "/" + processId);
275:                        }
276:                        String em = a.getValue("Execution");
277:                        if (em != null && em.equals("ASYNCHR")) {
278:                            execMode = ASYNCHR;
279:                        }
280:                    }
281:                }
282:
283:                /**
284:                 * Receive notification of the end of an element.
285:                 *
286:                 * @param uri the Namespace URI, or the empty string if the
287:                 * element has no Namespace URI or if Namespace processing is not
288:                 * being performed.
289:                 * @param loc the local name (without prefix), or the empty string
290:                 * if Namespace processing is not being performed.
291:                 * @param raw the raw XML 1.0 name (with prefix), or the empty
292:                 * string if raw names are not available.
293:                 * @throws SAXException not thrown.
294:                 */
295:                public void endElement(String uri, String loc, String raw)
296:                        throws SAXException {
297:                    if (loc.equals("ActualParameter")) {
298:                        apList.add(text().trim());
299:                    } else if (loc.equals("SubFlow")) {
300:                        actualParams = (String[]) apList
301:                                .toArray(new String[apList.size()]);
302:                    }
303:                }
304:            }
305:
306:            /**
307:             * Return a handler that can be used to initialize an object
308:             * from SAX events. The instance created is returned in the
309:             * HandlerStack's context data as "implementation".
310:             * @return the handler.
311:             */
312:            public static StackedHandler saxConstructor() {
313:                return (new ProcBasedImpl()).newSaxInitializer();
314:            }
315:
316:            private StackedHandler newSaxInitializer() {
317:                return new SAXInitializer();
318:            }
319:        }
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