Source Code Cross Referenced for TreeHead.java in  » EJB-Server-JBoss-4.2.1 » cluster » org » jboss » ha » jndi » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server JBoss 4.2.1 » cluster » org.jboss.ha.jndi 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * JBoss, Home of Professional Open Source.
003:         * Copyright 2006, Red Hat Middleware LLC, and individual contributors
004:         * as indicated by the @author tags. See the copyright.txt file in the
005:         * distribution for a full listing of individual contributors.
006:         *
007:         * This is free software; you can redistribute it and/or modify it
008:         * under the terms of the GNU Lesser General Public License as
009:         * published by the Free Software Foundation; either version 2.1 of
010:         * the License, or (at your option) any later version.
011:         *
012:         * This software is distributed in the hope that it will be useful,
013:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015:         * Lesser General Public License for more details.
016:         *
017:         * You should have received a copy of the GNU Lesser General Public
018:         * License along with this software; if not, write to the Free
019:         * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
021:         */
022:        package org.jboss.ha.jndi;
023:
024:        import org.jboss.ha.framework.interfaces.HAPartition;
025:        import org.jboss.logging.Logger;
026:        import org.jnp.interfaces.Naming;
027:        import org.jnp.interfaces.NamingContext;
028:
029:        import javax.naming.CommunicationException;
030:        import javax.naming.InitialContext;
031:        import javax.naming.Name;
032:        import javax.naming.NameNotFoundException;
033:        import javax.naming.NamingException;
034:        import java.io.Serializable;
035:        import java.util.ArrayList;
036:        import java.util.Collection;
037:
038:        /**
039:         *   This class extends the JNP JNDI implementation.
040:         *   binds and unbinds will be distributed to all members of the cluster
041:         *   that are running HAJNDI.
042:         *   lookups will look for Names in HAJNDI then delegate to the local InitialContext
043:         *   This class is fully serializable for GET_STATE
044:         *
045:         * @author <a href="mailto:sacha.labourey@jboss.org">Sacha Labourey</a>
046:         * @author Scott.Stark@jboss.org
047:         * @version $Revision: 57188 $
048:         */
049:        public class TreeHead extends org.jnp.server.NamingServer implements 
050:                Serializable, org.jnp.interfaces.Naming {
051:            /** @since 1.1.2.2, jboss-3.2.4 */
052:            private static final long serialVersionUID = 6342802270002172451L;
053:
054:            // Attributes --------------------------------------------------------
055:            private static Logger log = Logger.getLogger(TreeHead.class);
056:
057:            private transient HAPartition partition;
058:            private transient HAJNDI father;
059:
060:            // Constructor --------------------------------------------------------
061:
062:            public TreeHead() throws NamingException {
063:                super ();
064:            }
065:
066:            // Public --------------------------------------------------------
067:
068:            public void init() throws Exception {
069:                log.debug("registerRPCHandler");
070:                partition.registerRPCHandler("HAJNDI", this );
071:            }
072:
073:            public void stop() throws Exception {
074:
075:            }
076:
077:            public void destroy() throws Exception {
078:                log.debug("unregisterRPCHandler");
079:                partition.unregisterRPCHandler("HAJNDI", this );
080:            }
081:
082:            public void setPartition(HAPartition partition) {
083:                this .partition = partition;
084:            }
085:
086:            public void setHARMIHead(HAJNDI father) {
087:                this .father = father;
088:            }
089:
090:            // Naming implementation -----------------------------------------
091:
092:            public void _bind(Name name, Object obj, String className)
093:                    throws NamingException {
094:                if (log.isTraceEnabled())
095:                    log.trace("_bind, name=" + name);
096:                super .bind(name, obj, className);
097:            }
098:
099:            public void bind(Name name, Object obj, String className)
100:                    throws NamingException {
101:                if (log.isTraceEnabled())
102:                    log.trace("bind, name=" + name);
103:                super .bind(name, obj, className);
104:                // if we get here, this means we can do it on every node.
105:                Object[] args = new Object[3];
106:                args[0] = name;
107:                args[1] = obj;
108:                args[2] = className;
109:                try {
110:                    partition.callMethodOnCluster("HAJNDI", "_bind", args,
111:                            new Class[] { Name.class, Object.class,
112:                                    String.class }, true);
113:                } catch (Exception e) {
114:                    CommunicationException ce = new CommunicationException(
115:                            "Failed to _bind on cluster");
116:                    ce.setRootCause(e);
117:                    throw ce;
118:                }
119:            }
120:
121:            public void _rebind(Name name, Object obj, String className)
122:                    throws NamingException {
123:                if (log.isTraceEnabled())
124:                    log.trace("_rebind, name=" + name);
125:                super .rebind(name, obj, className);
126:            }
127:
128:            public void rebind(Name name, Object obj, String className)
129:                    throws NamingException {
130:                if (log.isTraceEnabled())
131:                    log.trace("rebind, name=" + name);
132:                super .rebind(name, obj, className);
133:
134:                // if we get here, this means we can do it on every node.
135:                Object[] args = new Object[3];
136:                args[0] = name;
137:                args[1] = obj;
138:                args[2] = className;
139:                try {
140:                    partition.callMethodOnCluster("HAJNDI", "_rebind", args,
141:                            new Class[] { Name.class, Object.class,
142:                                    String.class }, true);
143:                } catch (Exception e) {
144:                    CommunicationException ce = new CommunicationException(
145:                            "Failed to _rebind on cluster");
146:                    ce.setRootCause(e);
147:                    throw ce;
148:                }
149:            }
150:
151:            public void _unbind(Name name) throws NamingException {
152:                if (log.isTraceEnabled())
153:                    log.debug("_unbind, name=" + name);
154:                super .unbind(name);
155:            }
156:
157:            public void unbind(Name name) throws NamingException {
158:                if (log.isTraceEnabled())
159:                    log.trace("unbind, name=" + name);
160:                super .unbind(name);
161:
162:                // if we get here, this means we can do it on every node.
163:                Object[] args = new Object[1];
164:                args[0] = name;
165:                try {
166:                    partition.callMethodOnCluster("HAJNDI", "_unbind", args,
167:                            new Class[] { Name.class }, true);
168:                } catch (Exception e) {
169:                    CommunicationException ce = new CommunicationException(
170:                            "Failed to _unbind on cluster");
171:                    ce.setRootCause(e);
172:                    throw ce;
173:                }
174:            }
175:
176:            public Object lookup(Name name) throws NamingException {
177:                boolean trace = log.isTraceEnabled();
178:                if (trace)
179:                    log.trace("lookup, name=" + name);
180:                Object result = null;
181:                try {
182:                    result = super .lookup(name);
183:                } catch (NameNotFoundException ex) {
184:                    try {
185:                        // not found in global jndi, look in local.
186:                        result = lookupLocally(name);
187:                    } catch (NameNotFoundException nnfe) {
188:                        // if we get here, this means we can do it on every node.
189:                        Object[] args = new Object[1];
190:                        args[0] = name;
191:                        ArrayList rsp = null;
192:                        Exception cause = null;
193:                        try {
194:                            if (trace)
195:                                log.trace("calling lookupLocally(" + name
196:                                        + ") on cluster");
197:                            rsp = partition.callMethodOnCluster("HAJNDI",
198:                                    "lookupLocally", args,
199:                                    new Class[] { Name.class }, true);
200:                        } catch (Exception ignored) {
201:                            if (trace)
202:                                log.trace("Clusterd lookupLocally(" + name
203:                                        + ") failed", ignored);
204:                            cause = ignored;
205:                        }
206:
207:                        if (trace)
208:                            log.trace("Returned results size: "
209:                                    + (rsp != null ? rsp.size() : 0));
210:                        if (rsp == null || rsp.size() == 0) {
211:                            NameNotFoundException nnfe2 = new NameNotFoundException(
212:                                    name.toString());
213:                            nnfe2.setRootCause(cause);
214:                            throw nnfe2;
215:                        }
216:
217:                        for (int i = 0; i < rsp.size(); i++) {
218:                            result = rsp.get(i);
219:                            if (trace) {
220:                                String type = (result != null ? result
221:                                        .getClass().getName() : "null");
222:                                log.trace("_lookupLocally, i=" + i + ", value="
223:                                        + result + ", type=" + type);
224:                            }
225:                            // Ignore null and Exception return values
226:                            if (result != null
227:                                    && !(result instanceof  Exception))
228:                                return result;
229:                        }
230:                        throw nnfe;
231:                    }
232:                }
233:                return result;
234:            }
235:
236:            public Object _lookupLocally(Name name) {
237:                boolean trace = log.isTraceEnabled();
238:                if (trace)
239:                    log.trace("_lookupLocally, name=" + name);
240:                try {
241:                    return lookupLocally(name);
242:                } catch (Exception e) {
243:                    if (trace)
244:                        log.trace("_lookupLocally failed", e);
245:                    return e;
246:                }
247:            }
248:
249:            public Object lookupLocally(Name name) throws NamingException {
250:                boolean trace = log.isTraceEnabled();
251:                if (trace)
252:                    log.trace("lookupLocally, name=" + name);
253:
254:                // TODO: This is a really big hack here
255:                // We cannot do InitialContext().lookup(name) because
256:                // we get ClassNotFound errors and ClassLinkage errors.
257:                // So, what we do is cheat and get the static localServer variable
258:                try {
259:                    if (NamingContext.localServer != null) {
260:                        return NamingContext.localServer.lookup(name);
261:                    } else {
262:                        InitialContext ctx = new InitialContext();
263:                        return ctx.lookup(name);
264:                    }
265:                } catch (NamingException e) {
266:                    if (trace)
267:                        log.trace("lookupLocally failed, name=" + name, e);
268:                    throw e;
269:                } catch (java.rmi.RemoteException e) {
270:                    NamingException ne = new NamingException(
271:                            "unknown remote exception");
272:                    ne.setRootCause(e);
273:                    if (trace)
274:                        log.trace("lookupLocally failed, name=" + name, e);
275:                    throw ne;
276:                } catch (RuntimeException e) {
277:                    if (trace)
278:                        log.trace("lookupLocally failed, name=" + name, e);
279:                    throw e;
280:                }
281:            }
282:
283:            protected ArrayList enum2list(javax.naming.NamingEnumeration en) {
284:                ArrayList rtn = new ArrayList();
285:                try {
286:                    while (en.hasMore()) {
287:                        rtn.add(en.next());
288:                    }
289:                    en.close();
290:                } catch (NamingException ignored) {
291:                }
292:                return rtn;
293:            }
294:
295:            public Collection list(Name name) throws NamingException {
296:                if (log.isTraceEnabled())
297:                    log.trace("list, name=" + name);
298:                Collection result = null;
299:                try {
300:                    result = super .list(name);
301:                } catch (NameNotFoundException ex) {
302:                    // not found in global jndi, look in local.
303:                    result = enum2list(new InitialContext().list(name));
304:                }
305:                return result;
306:            }
307:
308:            public Collection listBindings(Name name) throws NamingException {
309:                if (log.isTraceEnabled())
310:                    log.trace("listBindings, name=" + name);
311:                Collection result = null;
312:                try {
313:                    result = super .listBindings(name);
314:                } catch (NameNotFoundException ex) {
315:                    // not found in global jndi, look in local.
316:                    result = enum2list(new InitialContext().listBindings(name));
317:                }
318:                return result;
319:            }
320:
321:            public javax.naming.Context _createSubcontext(Name name)
322:                    throws NamingException {
323:                if (log.isTraceEnabled())
324:                    log.trace("_createSubcontext, name=" + name);
325:                return super .createSubcontext(name);
326:            }
327:
328:            public javax.naming.Context createSubcontext(Name name)
329:                    throws NamingException {
330:                if (log.isTraceEnabled())
331:                    log.trace("createSubcontext, name=" + name);
332:                javax.naming.Context result = super .createSubcontext(name);
333:
334:                // if we get here, this means we can do it on every node.
335:                Object[] args = new Object[1];
336:                args[0] = name;
337:                try {
338:                    partition.callMethodOnCluster("HAJNDI",
339:                            "_createSubcontext", args,
340:                            new Class[] { Name.class }, true);
341:                } catch (Exception e) {
342:                    CommunicationException ce = new CommunicationException(
343:                            "Failed to _createSubcontext on cluster");
344:                    ce.setRootCause(e);
345:                    throw ce;
346:                }
347:
348:                return result;
349:            }
350:
351:            public Naming getRoot() {
352:                return father.getHAStub();
353:            }
354:
355:        }
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