Source Code Cross Referenced for AsynchronousFillHandle.java in  » Report » jasperreports-2.0.1 » net » sf » jasperreports » engine » fill » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Report » jasperreports 2.0.1 » net.sf.jasperreports.engine.fill 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * ============================================================================
003:         * GNU Lesser General Public License
004:         * ============================================================================
005:         *
006:         * JasperReports - Free Java report-generating library.
007:         * Copyright (C) 2001-2006 JasperSoft Corporation http://www.jaspersoft.com
008:         * 
009:         * This library is free software; you can redistribute it and/or
010:         * modify it under the terms of the GNU Lesser General Public
011:         * License as published by the Free Software Foundation; either
012:         * version 2.1 of the License, or (at your option) any later version.
013:         * 
014:         * This library 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:         * Lesser General Public License for more details.
018:         * 
019:         * You should have received a copy of the GNU Lesser General Public
020:         * License along with this library; if not, write to the Free Software
021:         * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
022:         * 
023:         * JasperSoft Corporation
024:         * 303 Second Street, Suite 450 North
025:         * San Francisco, CA 94107
026:         * http://www.jaspersoft.com
027:         */
028:        package net.sf.jasperreports.engine.fill;
029:
030:        import java.sql.Connection;
031:        import java.util.ArrayList;
032:        import java.util.Iterator;
033:        import java.util.List;
034:        import java.util.Map;
035:
036:        import net.sf.jasperreports.engine.JRDataSource;
037:        import net.sf.jasperreports.engine.JRException;
038:        import net.sf.jasperreports.engine.JasperPrint;
039:        import net.sf.jasperreports.engine.JasperReport;
040:
041:        /**
042:         * Class used to perform report filling asychronously.
043:         * <p>
044:         * An instance of this type can be used as a handle to an asychronous fill process.
045:         * The main benefit of this method is that the filling process can be cancelled.
046:         * 
047:         * @author Lucian Chirita (lucianc@users.sourceforge.net)
048:         * @version $Id: AsynchronousFillHandle.java 1440 2006-10-19 09:01:06Z lucianc $
049:         */
050:        public class AsynchronousFillHandle {
051:            protected final JasperReport jasperReport;
052:            protected final Map parameters;
053:            protected final JRDataSource dataSource;
054:            protected final Connection conn;
055:            protected final JRBaseFiller filler;
056:            protected final List listeners;
057:            protected Thread fillThread;
058:            protected boolean started = false;
059:            protected boolean running = false;
060:            protected boolean cancelled = false;
061:            protected final Object lock;
062:
063:            protected Integer priority = null;
064:
065:            protected String threadName;
066:
067:            protected AsynchronousFillHandle(JasperReport jasperReport,
068:                    Map parameters, JRDataSource dataSource) throws JRException {
069:                this (jasperReport, parameters, dataSource, null);
070:            }
071:
072:            protected AsynchronousFillHandle(JasperReport jasperReport,
073:                    Map parameters, Connection conn) throws JRException {
074:                this (jasperReport, parameters, null, conn);
075:            }
076:
077:            protected AsynchronousFillHandle(JasperReport jasperReport,
078:                    Map parameters) throws JRException {
079:                this (jasperReport, parameters, null, null);
080:            }
081:
082:            protected AsynchronousFillHandle(JasperReport jasperReport,
083:                    Map parameters, JRDataSource dataSource, Connection conn)
084:                    throws JRException {
085:                this .jasperReport = jasperReport;
086:                this .parameters = parameters;
087:                this .dataSource = dataSource;
088:                this .conn = conn;
089:                this .filler = JRFiller.createFiller(jasperReport);
090:                this .listeners = new ArrayList();
091:                lock = this ;
092:            }
093:
094:            /**
095:             * Adds a listener to the filling process.
096:             * 
097:             * @param listener the listener to be added
098:             */
099:            public void addListener(AsynchronousFilllListener listener) {
100:                listeners.add(listener);
101:            }
102:
103:            /**
104:             * Removes a listener from the filling process.
105:             * 
106:             * @param listener the listener to be removed
107:             * @return <tt>true</tt> if the listener was found and removed
108:             */
109:            public boolean removeListener(AsynchronousFilllListener listener) {
110:                return listeners.remove(listener);
111:            }
112:
113:            protected class ReportFiller implements  Runnable {
114:                public void run() {
115:                    synchronized (lock) {
116:                        running = true;
117:                    }
118:
119:                    try {
120:                        JasperPrint print;
121:                        if (conn != null) {
122:                            print = filler.fill(parameters, conn);
123:                        } else if (dataSource != null) {
124:                            print = filler.fill(parameters, dataSource);
125:                        } else {
126:                            print = filler.fill(parameters);
127:                        }
128:
129:                        notifyFinish(print);
130:                    } catch (Exception e) {
131:                        synchronized (lock) {
132:                            if (cancelled) {
133:                                notifyCancel();
134:                            } else {
135:                                notifyError(e);
136:                            }
137:                        }
138:                    } finally {
139:                        synchronized (lock) {
140:                            running = false;
141:                        }
142:                    }
143:                }
144:            }
145:
146:            /**
147:             * Starts the filling process asychronously.
148:             * <p>
149:             * The filling is launched on a new thread and the method exits
150:             * after the thread is started.
151:             * <p>
152:             * When the filling finishes either in success or failure, the listeners
153:             * are notified.  
154:             */
155:            public void startFill() {
156:                synchronized (lock) {
157:                    if (started) {
158:                        throw new IllegalStateException("Fill already started.");
159:                    }
160:
161:                    started = true;
162:                }
163:
164:                ReportFiller reportFiller = new ReportFiller();
165:
166:                if (threadName == null) {
167:                    fillThread = new Thread(reportFiller);
168:                } else {
169:                    fillThread = new Thread(reportFiller, threadName);
170:                }
171:
172:                if (priority != null) {
173:                    fillThread.setPriority(priority.intValue());
174:                }
175:
176:                fillThread.start();
177:            }
178:
179:            /**
180:             * Cancels the fill started by the handle.
181:             * <p>
182:             * The method sends a cancel signal to the filling process.
183:             * When the filling process will end, the listeners will be notified 
184:             * that the filling has been cancelled.
185:             * 
186:             * @throws JRException
187:             */
188:            public void cancellFill() throws JRException {
189:                synchronized (lock) {
190:                    if (!running) {
191:                        throw new IllegalStateException("Fill not running.");
192:                    }
193:
194:                    filler.cancelFill();
195:                    cancelled = true;
196:                }
197:            }
198:
199:            protected void notifyFinish(JasperPrint print) {
200:                for (Iterator i = listeners.iterator(); i.hasNext();) {
201:                    AsynchronousFilllListener listener = (AsynchronousFilllListener) i
202:                            .next();
203:                    listener.reportFinished(print);
204:                }
205:            }
206:
207:            protected void notifyCancel() {
208:                for (Iterator i = listeners.iterator(); i.hasNext();) {
209:                    AsynchronousFilllListener listener = (AsynchronousFilllListener) i
210:                            .next();
211:                    listener.reportCancelled();
212:                }
213:            }
214:
215:            protected void notifyError(Throwable e) {
216:                for (Iterator i = listeners.iterator(); i.hasNext();) {
217:                    AsynchronousFilllListener listener = (AsynchronousFilllListener) i
218:                            .next();
219:                    listener.reportFillError(e);
220:                }
221:            }
222:
223:            /**
224:             * Creates an asychronous filling handle.
225:             * 
226:             * @param jasperReport the report
227:             * @param parameters the parameter map
228:             * @param dataSource the data source
229:             * @return the handle
230:             * @throws JRException
231:             */
232:            public static AsynchronousFillHandle createHandle(
233:                    JasperReport jasperReport, Map parameters,
234:                    JRDataSource dataSource) throws JRException {
235:                AsynchronousFillHandle filler = new AsynchronousFillHandle(
236:                        jasperReport, parameters, dataSource);
237:
238:                return filler;
239:            }
240:
241:            /**
242:             * Creates an asychronous filling handle.
243:             * 
244:             * @param jasperReport the report
245:             * @param parameters the parameter map
246:             * @param conn the connection
247:             * @return the handle
248:             * @throws JRException
249:             */
250:            public static AsynchronousFillHandle createHandle(
251:                    JasperReport jasperReport, Map parameters, Connection conn)
252:                    throws JRException {
253:                AsynchronousFillHandle filler = new AsynchronousFillHandle(
254:                        jasperReport, parameters, conn);
255:
256:                return filler;
257:            }
258:
259:            /**
260:             * Creates an asychronous filling handle.
261:             * 
262:             * @param jasperReport the report
263:             * @param parameters the parameter map
264:             * @return the handle
265:             * @throws JRException
266:             */
267:            public static AsynchronousFillHandle createHandle(
268:                    JasperReport jasperReport, Map parameters)
269:                    throws JRException {
270:                AsynchronousFillHandle filler = new AsynchronousFillHandle(
271:                        jasperReport, parameters);
272:
273:                return filler;
274:            }
275:
276:            /**
277:             * Sets the priority of the filler thread.
278:             * 
279:             * @param priority the filler thread priority.
280:             * @see Thread#setPriority(int)
281:             */
282:            public void setPriority(int priority) {
283:                synchronized (lock) {
284:                    this .priority = new Integer(priority);
285:                    if (fillThread != null) {
286:                        fillThread.setPriority(priority);
287:                    }
288:                }
289:            }
290:
291:            /**
292:             * Sets the name of the filler thread.
293:             * 
294:             * @param name the filler thread name.
295:             * @see Thread#setName(java.lang.String)
296:             */
297:            public void setThreadName(String name) {
298:                synchronized (lock) {
299:                    this.threadName = name;
300:                    if (fillThread != null) {
301:                        fillThread.setName(name);
302:                    }
303:                }
304:            }
305:        }
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