Source Code Cross Referenced for EventScanner.java in  » 6.0-JDK-Modules » j2me » gov » nist » siplite » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » gov.nist.siplite 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Portions Copyright  2000-2007 Sun Microsystems, Inc. All Rights
003:         * Reserved.  Use is subject to license terms.
004:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
005:         * 
006:         * This program is free software; you can redistribute it and/or
007:         * modify it under the terms of the GNU General Public License version
008:         * 2 only, as published by the Free Software Foundation.
009:         * 
010:         * This program is distributed in the hope that it will be useful, but
011:         * WITHOUT ANY WARRANTY; without even the implied warranty of
012:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
013:         * General Public License version 2 for more details (a copy is
014:         * included at /legal/license.txt).
015:         * 
016:         * You should have received a copy of the GNU General Public License
017:         * version 2 along with this work; if not, write to the Free Software
018:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
019:         * 02110-1301 USA
020:         * 
021:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
022:         * Clara, CA 95054 or visit www.sun.com if you need additional
023:         * information or have any questions.
024:         */
025:
026:        package gov.nist.siplite;
027:
028:        import gov.nist.siplite.message.Request;
029:        import gov.nist.siplite.message.Response;
030:        import gov.nist.siplite.stack.ClientTransaction;
031:        import gov.nist.siplite.stack.Dialog;
032:        import gov.nist.siplite.stack.ServerTransaction;
033:        import gov.nist.siplite.stack.Transaction;
034:
035:        import java.io.IOException;
036:        import java.util.Enumeration;
037:        import java.util.Vector;
038:
039:        import com.sun.midp.log.Logging;
040:        import com.sun.midp.log.LogChannels;
041:
042:        /**
043:         * Event scanner.
044:         */
045:        public class EventScanner implements  Runnable {
046:            /** Current SIP stack context. */
047:            private SipStack sipStack;
048:            /** Vector of pending events. */
049:            private Vector pendingEvents;
050:            /** Current SIP event listener. */
051:            private SipListener sipListener;
052:            /** Flag to indicate if event processing is stopped. */
053:            private boolean isStopped;
054:
055:            /**
056:             * Constructor.
057:             * @param sipStack the current transaction context
058:             */
059:            public EventScanner(SipStack sipStack) {
060:                this .sipStack = sipStack;
061:                this .pendingEvents = new Vector();
062:            }
063:
064:            /**
065:             * Starts the scanning for events.
066:             */
067:            public void start() {
068:                Thread myThread = new Thread(this );
069:                myThread.setPriority(Thread.MAX_PRIORITY);
070:                myThread.start();
071:            }
072:
073:            /**
074:             * Stops the scanning for events.
075:             */
076:            public void stop() {
077:                synchronized (this .pendingEvents) {
078:                    this .isStopped = true;
079:                    this .pendingEvents.notify();
080:                }
081:            }
082:
083:            /**
084:             * Adds a new event to be processed.
085:             * @param eventWrapper the event filter handler to be added
086:             */
087:            public void addEvent(EventWrapper eventWrapper) {
088:                synchronized (pendingEvents) {
089:                    pendingEvents.addElement(eventWrapper);
090:                    pendingEvents.notify();
091:                }
092:            }
093:
094:            /**
095:             * Starts the scanner procesing.
096:             */
097:            public void run() {
098:                while (true) {
099:                    SipEvent sipEvent = null;
100:                    EventWrapper eventWrapper = null;
101:
102:                    synchronized (this .pendingEvents) {
103:                        if (pendingEvents.isEmpty()) {
104:                            try {
105:                                pendingEvents.wait();
106:                            } catch (InterruptedException ex) {
107:                                if (Logging.REPORT_LEVEL <= Logging.INFORMATION) {
108:                                    Logging.report(Logging.INFORMATION,
109:                                            LogChannels.LC_JSR180,
110:                                            "Interrupted!");
111:                                }
112:                                continue;
113:                            }
114:                        }
115:
116:                        if (this .isStopped) {
117:                            return;
118:                        }
119:
120:                        SipListener sipListener = sipStack.getSipListener();
121:                        Enumeration iterator = pendingEvents.elements();
122:
123:                        while (iterator.hasMoreElements()) {
124:                            eventWrapper = (EventWrapper) iterator
125:                                    .nextElement();
126:                            sipEvent = eventWrapper.sipEvent;
127:
128:                            if (Logging.REPORT_LEVEL <= Logging.INFORMATION) {
129:                                Logging.report(Logging.INFORMATION,
130:                                        LogChannels.LC_JSR180, "Processing "
131:                                                + sipEvent + "nevents "
132:                                                + pendingEvents.size());
133:                            }
134:
135:                            try {
136:                                if (sipEvent instanceof  RequestEvent) {
137:                                    // Check if this request has already created a
138:                                    // transaction
139:                                    Request sipRequest = (Request) ((RequestEvent) sipEvent)
140:                                            .getRequest();
141:                                    // Check if this request has already created a
142:                                    // transaction. If this is a dialog creating
143:                                    // method for which a server transaction
144:                                    // already exists or a method which is not
145:                                    // dialog creating and not within an existing
146:                                    // dialog (special handling for cancel) then
147:                                    // check to see if the listener already
148:                                    // created a transaction to handle this
149:                                    // request and discard the duplicate request
150:                                    // if a transaction already exists. If the
151:                                    // listener chose to handle the request
152:                                    // statelessly, then the listener will see the
153:                                    // retransmission.  Note that in both of these
154:                                    // two cases, JAIN SIP will allow you to
155:                                    // handle the request statefully or
156:                                    // statelessly.  An example of the latter case
157:                                    // is REGISTER and an example of the former
158:                                    // case is INVITE.
159:
160:                                    /*
161:                                     * The transaction was added to the list
162:                                     * in SIPTransactionStack, so it is not the right
163:                                     * place to check if the transaction already exists.
164:                                     *
165:                                     * IMPL_NOTE: remove the following block of code after
166:                                     *       ensuring that it doesn't break anything.
167:                                     */
168:
169:                                    /*
170:                                     if (sipStack.
171:                                     isDialogCreated(sipRequest.getMethod())) {
172:                                     SipProvider sipProvider =
173:                                     (SipProvider)sipEvent.getSource();
174:                                     sipProvider.currentTransaction =
175:                                     (ServerTransaction)
176:                                     eventWrapper.transaction;
177:                                     ServerTransaction tr = (ServerTransaction)
178:                                     sipStack.findTransaction(sipRequest, true);
179:                                     Dialog dialog = sipStack.getDialog
180:                                     (sipRequest.getDialogId(true));
181:
182:                                     if (tr != null && !tr.passToListener()) {
183:                                     if (Logging.REPORT_LEVEL <=
184:                                     Logging.INFORMATION) {
185:                                     Logging.report(Logging.INFORMATION,
186:                                     LogChannels.LC_JSR180,
187:                                     "transaction already exists!");
188:                                     }
189:                                     continue;
190:                                     }
191:                                     } else if (!sipRequest.getMethod()
192:                                     .equals(Request.CANCEL) &&
193:                                     sipStack.getDialog(sipRequest
194:                                     .getDialogId(true))
195:                                     == null) {
196:                                     // not dialog creating and not a cancel.
197:                                     // transaction already processed this message.
198:                                     Transaction tr = sipStack
199:                                     .findTransaction(sipRequest,
200:                                     true);
201:                                     //
202:                                     // Should this be allowed?
203:                                     // SipProvider sipProvider =
204:                                     //     (SipProvider) sipEvent.getSource();
205:                                     // sipProvider.currentTransaction =
206:                                     // (ServerTransaction) eventWrapper.transaction;
207:                                     // If transaction already exists bail.
208:                                     if (tr != null) {
209:                                     if (Logging.REPORT_LEVEL <=
210:                                     Logging.INFORMATION) {
211:                                     Logging.report(Logging.INFORMATION,
212:                                     LogChannels.LC_JSR180,
213:                                     "transaction already exists!");
214:                                     }
215:                                     continue;
216:                                     }
217:                                     }
218:                                     */
219:
220:                                    // Processing incoming CANCEL.
221:                                    if (sipRequest.getMethod().equals(
222:                                            Request.CANCEL)) {
223:                                        Transaction tr = sipStack
224:                                                .findTransaction(sipRequest,
225:                                                        true);
226:                                        if (tr != null
227:                                                && tr.getState() == Transaction.TERMINATED_STATE) {
228:                                            // If transaction already exists but it is
229:                                            // too late to cancel the transaction then
230:                                            // just respond OK to the CANCEL and bail.
231:                                            if (Logging.REPORT_LEVEL <= Logging.INFORMATION) {
232:                                                Logging
233:                                                        .report(
234:                                                                Logging.INFORMATION,
235:                                                                LogChannels.LC_JSR180,
236:                                                                "Too late to cancel Transaction");
237:                                            }
238:
239:                                            // send OK and just ignore the CANCEL.
240:                                            try {
241:                                                tr
242:                                                        .sendMessage(sipRequest
243:                                                                .createResponse(Response.OK));
244:                                            } catch (IOException ex) {
245:                                                // Ignore?
246:                                            }
247:                                            continue;
248:                                        }
249:                                    }
250:
251:                                    sipListener
252:                                            .processRequest((RequestEvent) sipEvent);
253:                                } else if (sipEvent instanceof  ResponseEvent) {
254:                                    sipListener
255:                                            .processResponse((ResponseEvent) sipEvent);
256:                                    ClientTransaction ct = ((ResponseEvent) sipEvent)
257:                                            .getClientTransaction();
258:                                    ct.clearEventPending();
259:                                } else if (sipEvent instanceof  TimeoutEvent) {
260:                                    sipListener
261:                                            .processTimeout((TimeoutEvent) sipEvent);
262:                                    // Mark that Timeout event has been processed
263:                                    if (eventWrapper.transaction != null) {
264:                                        if (eventWrapper.transaction instanceof  ClientTransaction) {
265:                                            ((ClientTransaction) eventWrapper.transaction)
266:                                                    .clearEventPending();
267:                                        }
268:                                    }
269:                                } else {
270:                                    if (Logging.REPORT_LEVEL <= Logging.INFORMATION) {
271:                                        Logging.report(Logging.INFORMATION,
272:                                                LogChannels.LC_JSR180,
273:                                                "bad event");
274:                                    }
275:                                }
276:                            } catch (Throwable exc) { // ignore
277:                                if (Logging.REPORT_LEVEL <= Logging.INFORMATION) {
278:                                    Logging.report(Logging.INFORMATION,
279:                                            LogChannels.LC_JSR180,
280:                                            "Uncaught exception ");
281:                                }
282:                            }
283:                        }
284:
285:                        pendingEvents.removeAllElements();
286:                    } // end of Synchronized block
287:                } // end While
288:            }
289:
290:        }
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