Source Code Cross Referenced for TransactionCurrentImpl.java in  » Collaboration » JacORB » org » jacorb » transaction » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Collaboration » JacORB » org.jacorb.transaction 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *        JacORB - a free Java ORB
003:         *
004:         *   Copyright (C) 1999-2004 Gerald Brose
005:         *
006:         *   This library is free software; you can redistribute it and/or
007:         *   modify it under the terms of the GNU Library General Public
008:         *   License as published by the Free Software Foundation; either
009:         *   version 2 of the License, or (at your option) any later version.
010:         *
011:         *   This library 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 GNU
014:         *   Library General Public License for more details.
015:         *
016:         *   You should have received a copy of the GNU Library General Public
017:         *   License along with this library; if not, write to the Free
018:         *   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
019:         *
020:         */
021:        package org.jacorb.transaction;
022:
023:        import org.apache.avalon.framework.logger.Logger;
024:
025:        import org.omg.CosTransactions.*;
026:        import org.omg.CosNaming.*;
027:        import org.omg.IOP.*;
028:        import org.jacorb.orb.ORB;
029:        import org.omg.CORBA.Any;
030:        import java.util.*;
031:
032:        /**
033:         * This class represents the transaction current.
034:         * It is a very simple implementation wich mostly
035:         * maps to the methods in the control. 
036:         *
037:         * @author Nicolas Noffke
038:         * @author Vladimir Mencl
039:         * @version $Id: TransactionCurrentImpl.java,v 1.17 2005/11/20 13:48:16 andre.spiegel Exp $
040:         */
041:
042:        public class TransactionCurrentImpl extends org.omg.CORBA.LocalObject
043:                implements  Current {
044:            private static final int DEFAULT_TIMEOUT = 30;
045:
046:            private Hashtable contexts = null;
047:            private Hashtable timeouts = null;
048:            private ORB orb = null;
049:            private static int slot_id = -1; /* used from static getControl */
050:
051:            /** there will only be ony logger instance for all TX services in a process...*/
052:            private static Logger logger;
053:
054:            private TransactionFactory factory = null;
055:
056:            public TransactionCurrentImpl(ORB orb, int slot_id) {
057:                this .orb = orb;
058:                this .slot_id = slot_id;
059:                logger = orb.getConfiguration().getNamedLogger(
060:                        "jacorb.tx_service.current");
061:
062:                contexts = new Hashtable();
063:                timeouts = new Hashtable();
064:
065:                try {
066:                    NamingContextExt nc = NamingContextExtHelper.narrow(orb
067:                            .resolve_initial_references("NameService"));
068:                    NameComponent[] name = new NameComponent[1];
069:                    name[0] = new NameComponent("TransactionService", "service");
070:                    factory = TransactionFactoryHelper.narrow(nc.resolve(name));
071:                } catch (Exception e) {
072:                    if (logger.isErrorEnabled())
073:                        logger
074:                                .error(
075:                                        "Unable to obtain Transaction Service reference. Giving up.",
076:                                        e);
077:                    throw new Error(e.getMessage());
078:                }
079:            }
080:
081:            /**
082:             * Creates a non-functional current.
083:             */
084:            public TransactionCurrentImpl() {
085:                contexts = new Hashtable();
086:                timeouts = new Hashtable();
087:            }
088:
089:            /**
090:             * This method is a convenience method for the server
091:             * programmer the exctract the Control from the
092:             * PICurrent.
093:             */
094:            public static Control getControl(org.omg.CORBA.ORB orb) {
095:                try {
096:                    org.omg.PortableInterceptor.Current pi_current = (org.omg.PortableInterceptor.Current) orb
097:                            .resolve_initial_references("PICurrent");
098:
099:                    PropagationContext context = PropagationContextHelper
100:                            .extract(pi_current.get_slot(slot_id));
101:
102:                    return ControlHelper
103:                            .extract(context.implementation_specific_data);
104:                } catch (Exception e) {
105:                    if (logger.isDebugEnabled())
106:                        logger
107:                                .debug(
108:                                        "Unable to obtain Transaction Service reference. Giving up.",
109:                                        e);
110:                }
111:
112:                return null;
113:            }
114:
115:            // implementation of org.omg.CosTransactions.CurrentOperations interface
116:            /**
117:             * Start a new transaction. The propagation context will be transfered
118:             * on ALL communication (~1k extra data) from now on, until
119:             * the transaction is committed or rolled back. <br>
120:             * NOTICE: the PropagationContext might not be set up fully
121:             * compliant to the Spec.
122:             */
123:            public void begin() throws SubtransactionsUnavailable {
124:                Thread thread = Thread.currentThread();
125:
126:                if (contexts.containsKey(thread))
127:                    throw new SubtransactionsUnavailable();
128:
129:                int timeout = (timeouts.containsKey(thread)) ? ((Integer) timeouts
130:                        .get(thread)).intValue()
131:                        : DEFAULT_TIMEOUT;
132:
133:                Control control = factory.create(timeout);
134:                contexts.put(thread, control);
135:
136:                try {
137:                    org.omg.PortableInterceptor.Current pi_current = (org.omg.PortableInterceptor.Current) orb
138:                            .resolve_initial_references("PICurrent");
139:
140:                    // the info inserted here is actually never needed and mostly a waste of
141:                    // space/bandwidth, since the control itself is transfered also.
142:                    TransIdentity id = new TransIdentity(control
143:                            .get_coordinator(), control.get_terminator(),
144:                            new otid_t(0, 0, new byte[0]));
145:
146:                    Any control_any = orb.create_any();
147:                    ControlHelper.insert(control_any, control);
148:
149:                    PropagationContext context = new PropagationContext(
150:                            timeout, id, new TransIdentity[0], control_any);
151:                    Any context_any = orb.create_any();
152:                    PropagationContextHelper.insert(context_any, context);
153:
154:                    pi_current.set_slot(slot_id, context_any);
155:                } catch (Exception e) {
156:                    if (logger.isDebugEnabled())
157:                        logger.debug("Exception: ", e);
158:                }
159:            }
160:
161:            public void commit(boolean report_heuristics) throws NoTransaction,
162:                    HeuristicMixed, HeuristicHazard {
163:                Thread current = Thread.currentThread();
164:
165:                if (!contexts.containsKey(current))
166:                    throw new NoTransaction();
167:
168:                Control control = null;
169:                try {
170:                    control = (Control) contexts.get(current);
171:                    control.get_terminator().commit(report_heuristics);
172:                    control._release();
173:
174:                    removeContext(current);
175:                } catch (org.omg.CORBA.TRANSACTION_ROLLEDBACK tr) {
176:                    // Transaction was rolledback.
177:                    if (logger.isDebugEnabled())
178:                        logger.debug("TRANSACTION_ROLLEDBACK: ", tr);
179:
180:                    control._release();
181:                    removeContext(current);
182:                    throw tr; // re-throw the exception
183:                } catch (Exception e) {
184:                    if (logger.isDebugEnabled())
185:                        logger.debug("Exception: ", e);
186:                }
187:            }
188:
189:            /**
190:             * This and the following method should actually throw 
191:             * NoTransaction, but that is against the spec.
192:             */
193:            public Control get_control() {
194:                return (Control) contexts.get(Thread.currentThread());
195:            }
196:
197:            public Status get_status() {
198:                Thread current = Thread.currentThread();
199:
200:                if (!contexts.containsKey(current))
201:                    return null;
202:
203:                try {
204:                    return ((Control) contexts.get(current)).get_coordinator()
205:                            .get_status();
206:                } catch (Exception e) {
207:                    if (logger.isDebugEnabled())
208:                        logger.debug("Exception: ", e);
209:                }
210:                return null;
211:            }
212:
213:            public String get_transaction_name() {
214:                Thread current = Thread.currentThread();
215:
216:                if (!contexts.containsKey(current))
217:                    return null;
218:
219:                try {
220:                    return ((Control) contexts.get(current)).get_coordinator()
221:                            .get_transaction_name();
222:                } catch (Exception e) {
223:                    if (logger.isDebugEnabled())
224:                        logger.debug("Exception: ", e);
225:                }
226:                return null;
227:            }
228:
229:            public void resume(Control which) throws InvalidControl {
230:                setCurrentThreadContext(which);
231:            }
232:
233:            public void rollback() throws NoTransaction {
234:                Thread current = Thread.currentThread();
235:
236:                if (!contexts.containsKey(current))
237:                    throw new NoTransaction();
238:                try {
239:                    Control control = (Control) contexts.get(current);
240:                    control.get_terminator().rollback();
241:
242:                    control._release();
243:
244:                    removeContext(current);
245:                } catch (Exception e) {
246:                    if (logger.isDebugEnabled())
247:                        logger.debug("Exception: ", e);
248:                }
249:            }
250:
251:            public void rollback_only() throws NoTransaction {
252:                Thread current = Thread.currentThread();
253:
254:                if (!contexts.containsKey(current))
255:                    throw new NoTransaction();
256:                try {
257:                    Control control = (Control) contexts.get(current);
258:                    control.get_coordinator().rollback_only();
259:                    control._release();
260:
261:                    removeContext(current);
262:                } catch (Exception e) {
263:                    if (logger.isDebugEnabled())
264:                        logger.debug("Exception: ", e);
265:                }
266:            }
267:
268:            public void set_timeout(int seconds) {
269:                timeouts.put(Thread.currentThread(), new Integer(seconds));
270:            }
271:
272:            public Control suspend() {
273:                Control result = get_control();
274:                removeContext(Thread.currentThread());
275:                return result;
276:            }
277:
278:            public void setCurrentThreadContext(Control control) {
279:                Thread thread = Thread.currentThread();
280:
281:                contexts.put(thread, control);
282:
283:                try {
284:                    org.omg.PortableInterceptor.Current pi_current = (org.omg.PortableInterceptor.Current) orb
285:                            .resolve_initial_references("PICurrent");
286:
287:                    // the info inserted here is actually never needed and mostly a waste of
288:                    // space/bandwidth, since the control itself is transfered also.
289:                    TransIdentity id = new TransIdentity(control
290:                            .get_coordinator(), control.get_terminator(),
291:                            new otid_t(0, 0, new byte[0]));
292:
293:                    Any control_any = orb.create_any();
294:                    ControlHelper.insert(control_any, control);
295:
296:                    int timeout = (timeouts.containsKey(thread)) ? ((Integer) timeouts
297:                            .get(thread)).intValue()
298:                            : DEFAULT_TIMEOUT;
299:
300:                    PropagationContext context = new PropagationContext(
301:                            timeout, id, new TransIdentity[0], control_any);
302:
303:                    Any context_any = orb.create_any();
304:                    PropagationContextHelper.insert(context_any, context);
305:                    pi_current.set_slot(slot_id, context_any);
306:                } catch (Exception e) {
307:                    if (logger.isDebugEnabled())
308:                        logger.debug("Exception: ", e);
309:                }
310:            }
311:
312:            private void removeContext(Thread current) {
313:                //remove control from Hashtable
314:                contexts.remove(current);
315:
316:                try {
317:                    org.omg.PortableInterceptor.Current pi_current = (org.omg.PortableInterceptor.Current) orb
318:                            .resolve_initial_references("PICurrent");
319:
320:                    //remove control from PICurrent by overwriting it with
321:                    //an empty any
322:                    Any empty = orb.create_any();
323:                    pi_current.set_slot(slot_id, empty);
324:                } catch (Exception e) {
325:                    if (logger.isDebugEnabled())
326:                        logger.debug("Exception: ", e);
327:                }
328:            }
329:        } // TransactionCurrentImpl
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