Source Code Cross Referenced for Resource.java in  » Workflow-Engines » Bossa » com » bigbross » bossa » resource » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Workflow Engines » Bossa » com.bigbross.bossa.resource 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Bossa Workflow System
003:         *
004:         * $Id: Resource.java,v 1.15 2004/01/29 21:24:37 gdvieira Exp $
005:         *
006:         * Copyright (C) 2003,2004 OpenBR Sistemas S/C Ltda.
007:         *
008:         * This file is part of Bossa.
009:         *
010:         * Bossa is free software; you can redistribute it and/or modify it
011:         * under the terms of version 2 of the GNU General Public License as
012:         * published by the Free Software Foundation.
013:         *
014:         * This program is distributed in the hope that it will be useful,
015:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
016:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
017:         * General Public License for more details.
018:         *
019:         * You should have received a copy of the GNU General Public
020:         * License along with this program; if not, write to the
021:         * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
022:         * Boston, MA 02111-1307, USA.
023:         */
024:
025:        package com.bigbross.bossa.resource;
026:
027:        import java.io.Serializable;
028:        import java.util.Collections;
029:        import java.util.HashSet;
030:        import java.util.Iterator;
031:        import java.util.Set;
032:
033:        import com.bigbross.bossa.Bossa;
034:        import com.bigbross.bossa.BossaException;
035:
036:        /**
037:         * This class represents a single resource or a group of resources.
038:         * A group of resources may include or exclude other resources. <p>
039:         *
040:         * @author <a href="http://www.bigbross.com">BigBross Team</a>
041:         */
042:        public class Resource implements  Container, Serializable {
043:
044:            private ResourceRegistry resourceRegistry;
045:
046:            private String id;
047:
048:            private Set includes = new HashSet();
049:
050:            private Set excludes = new HashSet();
051:
052:            /**
053:             * Creates a new <code>Resource</code> instance with the given
054:             * identifier. <p>
055:             *
056:             * @param resourceRegistry the resource registry this resource is
057:             *        registered into.
058:             * @param id the resource id.
059:             */
060:            Resource(ResourceRegistry resourceRegistry, String id) {
061:                this .resourceRegistry = resourceRegistry;
062:                this .id = id;
063:            }
064:
065:            /**
066:             * Returns the resource registry this resource is registered into. <p>
067:             * 
068:             * @return the resource registry this resource is registered into.
069:             */
070:            ResourceRegistry getResourceRegistry() {
071:                return resourceRegistry;
072:            }
073:
074:            /**
075:             * Returns the bossa engine this resource is part, if any. <p>
076:             * 
077:             * @return the bossa engine this resource is part,
078:             *         <code>null</code> if not part of a bossa engine.
079:             */
080:            Bossa getBossa() {
081:                if (getResourceRegistry() != null) {
082:                    return getResourceRegistry().getBossa();
083:                } else {
084:                    return null;
085:                }
086:            }
087:
088:            /**
089:             * Returns the resource identifier. <p>
090:             *
091:             * @return the resource id.
092:             */
093:            public String getId() {
094:                return id;
095:            }
096:
097:            /**
098:             * Returns <code>true</code> if this resource includes any other
099:             * resources, so it is a group.
100:             *
101:             * @return <code>true</code> if it is a group,
102:             *         <code>false</code> otherwise.
103:             */
104:            public boolean isGroup() {
105:                return includes.size() > 0;
106:            }
107:
108:            /**
109:             * Returns the includes list of this resource. <p>
110:             * 
111:             * @return the includes list of this resource.
112:             */
113:            public Set getIncludes() {
114:                return Collections.unmodifiableSet(includes);
115:            }
116:
117:            /**
118:             * Returns the excludes list of this resource. <p>
119:             * 
120:             * @return the excludes list of this resource.
121:             */
122:            public Set getExcludes() {
123:                return Collections.unmodifiableSet(excludes);
124:            }
125:
126:            /**
127:             * Includes a resource in this resource. Removes the resource from
128:             * the excludes list if needed. <p>
129:             *
130:             * @param resource the resource to be included.
131:             * @return <code>false</code> if resource includes this resource,
132:             *         <code>true</code> otherwise.
133:             * @exception PersistenceException if an error occours when making the
134:             *            execution of this method persistent.
135:             */
136:            public boolean include(Resource resource) throws BossaException {
137:                ResourceTransaction includeTransaction = new IncludeInResource(
138:                        this , resource);
139:                return ((Boolean) getBossa().execute(includeTransaction))
140:                        .booleanValue();
141:            }
142:
143:            /**
144:             * Includes a resource in this resource. Removes the resource from
145:             * the excludes list if needed. <p>
146:             *
147:             * This method does not create a transaction in the prevalent system. The
148:             * execution of this method will not be persistent unless it is called
149:             * inside an appropriate transaction. <p>
150:             * 
151:             * @param resource the resource to be included.
152:             * @param notify if this operation should be notified.
153:             * @return <code>false</code> if resource includes this resource,
154:             *         <code>true</code> otherwise.
155:             */
156:            public boolean includeImpl(Resource resource, boolean notify) {
157:                if (resource.depends(this )) {
158:                    return false;
159:                }
160:                excludes.remove(resource);
161:                includes.add(resource);
162:                if (notify) {
163:                    ResourceEvents queue = new ResourceEvents();
164:                    queue.newTwoResourcesEvent(getBossa(),
165:                            ResourceEvents.ID_INCLUDE_IN_RESOURCE, resource,
166:                            this );
167:                    queue.notifyAll(getBossa());
168:                }
169:                return true;
170:            }
171:
172:            /**
173:             * Excludes a resource from this resource. Removes the resource from
174:             * the includes list if needed. <p>
175:             * 
176:             * @param resource the resource to be excluded.
177:             * @return <code>false</code> if resource excludes this resource,
178:             *         <code>true</code> otherwise.
179:             * @exception PersistenceException if an error occours when making the
180:             *            execution of this method persistent.
181:             */
182:            public boolean exclude(Resource resource) throws BossaException {
183:                ResourceTransaction excludeTransaction = new ExcludeInResource(
184:                        this , resource);
185:                return ((Boolean) getBossa().execute(excludeTransaction))
186:                        .booleanValue();
187:            }
188:
189:            /**
190:             * Excludes a resource from this resource. Removes the resource from
191:             * the includes list if needed. <p>
192:             *
193:             * This method does not create a transaction in the prevalent system. The
194:             * execution of this method will not be persistent unless it is called
195:             * inside an appropriate transaction. <p>
196:             * 
197:             * @param resource the resource to be excluded.
198:             * @param notify if this operation should be notified.
199:             * @return <code>false</code> if resource excludes this resource,
200:             *         <code>true</code> otherwise.
201:             */
202:            public boolean excludeImpl(Resource resource, boolean notify) {
203:                if (resource.depends(this )) {
204:                    return false;
205:                }
206:                includes.remove(resource);
207:                excludes.add(resource);
208:                if (notify) {
209:                    ResourceEvents queue = new ResourceEvents();
210:                    queue.newTwoResourcesEvent(getBossa(),
211:                            ResourceEvents.ID_EXCLUDE_IN_RESOURCE, resource,
212:                            this );
213:                    queue.notifyAll(getBossa());
214:                }
215:                return true;
216:            }
217:
218:            /**
219:             * Removes a resource from this resource. Effectively removes it from
220:             * any of the includes or excludes list. <p>
221:             *
222:             * @param resource the resource to be removed.
223:             * @exception PersistenceException if an error occours when making the
224:             *            execution of this method persistent.
225:             */
226:            public void remove(Resource resource) throws BossaException {
227:                ResourceTransaction removeTransaction = new RemoveFromResource(
228:                        this , resource);
229:                getBossa().execute(removeTransaction);
230:            }
231:
232:            /**
233:             * Removes a resource from this resource. Effectively removes it from
234:             * any of the includes or excludes list. <p>
235:             *
236:             * This method does not create a transaction in the prevalent system. The
237:             * execution of this method will not be persistent unless it is called
238:             * inside an appropriate transaction. <p>
239:             * 
240:             * @param resource the resource to be removed.
241:             * @param notify if this operation should be notified.
242:             */
243:            public void removeImpl(Resource resource, boolean notify) {
244:                boolean inc = includes.remove(resource);
245:                boolean exc = excludes.remove(resource);
246:                if ((inc || exc) && notify) {
247:                    ResourceEvents queue = new ResourceEvents();
248:                    queue.newTwoResourcesEvent(getBossa(),
249:                            ResourceEvents.ID_REMOVE_FROM_RESOURCE, resource,
250:                            this );
251:                    queue.notifyAll(getBossa());
252:                }
253:            }
254:
255:            /**
256:             * Determines if a resource is contained in this resource. <p>
257:             *
258:             * @param resource the resource to be looked for.
259:             * @return <code>true</code> if the resource is found,
260:             *         <code>false</code> otherwise.
261:             */
262:            public boolean contains(Resource resource) {
263:
264:                if (this .equals(resource)) {
265:                    return true;
266:                }
267:
268:                if (!isGroup()) {
269:                    return false;
270:                }
271:
272:                if (excludes.contains(resource)) {
273:                    return false;
274:                }
275:
276:                Iterator it = excludes.iterator();
277:                while (it.hasNext()) {
278:                    Resource curr = (Resource) it.next();
279:                    if (curr.contains(resource)) {
280:                        return false;
281:                    }
282:                }
283:
284:                if (includes.contains(resource)) {
285:                    return true;
286:                }
287:
288:                it = includes.iterator();
289:                while (it.hasNext()) {
290:                    Resource curr = (Resource) it.next();
291:                    if (curr.contains(resource)) {
292:                        return true;
293:                    }
294:                }
295:
296:                return false;
297:            }
298:
299:            /**
300:             * Checks if this resource depends on the given resource.
301:             * Specifically, checks if it is necessary to call
302:             * <code>contains()</code> in the given resource to check
303:             * <code>contains()</code> in this resource. <p>
304:             *
305:             * @param resource the resource to be checked.
306:             * @return <code>true</code> if this resource depends,
307:             *         <code>false</code> otherwise.
308:             */
309:            private boolean depends(Resource resource) {
310:
311:                if (this .equals(resource)) {
312:                    return true;
313:                }
314:
315:                if (includes.contains(resource)) {
316:                    return true;
317:                }
318:
319:                Iterator it = includes.iterator();
320:                while (it.hasNext()) {
321:                    Resource curr = (Resource) it.next();
322:                    if (curr.depends(resource)) {
323:                        return true;
324:                    }
325:                }
326:
327:                if (excludes.contains(resource)) {
328:                    return true;
329:                }
330:
331:                it = excludes.iterator();
332:                while (it.hasNext()) {
333:                    Resource curr = (Resource) it.next();
334:                    if (curr.depends(resource)) {
335:                        return true;
336:                    }
337:                }
338:
339:                return false;
340:            }
341:
342:            /**
343:             * Returns a string with the resource identifier. <p>
344:             *
345:             * @return a string representation of this resource.
346:             */
347:            public String toString() {
348:                return id;
349:            }
350:
351:        }
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