Source Code Cross Referenced for ModJkMX.java in  » Sevlet-Container » tomcat-connectors » org » apache » jk » common » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Sevlet Container » tomcat connectors » org.apache.jk.common 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  Copyright 1999-2004 The Apache Software Foundation
003:         *
004:         *  Licensed under the Apache License, Version 2.0 (the "License");
005:         *  you may not use this file except in compliance with the License.
006:         *  You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         *  Unless required by applicable law or agreed to in writing, software
011:         *  distributed under the License is distributed on an "AS IS" BASIS,
012:         *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         *  See the License for the specific language governing permissions and
014:         *  limitations under the License.
015:         */
016:
017:        package org.apache.jk.common;
018:
019:        import java.io.IOException;
020:        import java.io.BufferedReader;
021:        import java.io.InputStreamReader;
022:        import java.net.URLConnection;
023:        import java.net.URL;
024:        import java.util.List;
025:        import java.util.ArrayList;
026:        import java.util.HashMap;
027:        import java.util.Iterator;
028:        import javax.management.MBeanServer;
029:        import javax.management.AttributeNotFoundException;
030:        import javax.management.MBeanException;
031:        import javax.management.ReflectionException;
032:        import javax.management.Attribute;
033:        import javax.management.ObjectName;
034:
035:        import org.apache.jk.core.JkHandler;
036:        import org.apache.commons.modeler.Registry;
037:        import org.apache.commons.modeler.BaseModelMBean;
038:        import org.apache.commons.modeler.ManagedBean;
039:        import org.apache.commons.modeler.AttributeInfo;
040:        import org.apache.commons.modeler.OperationInfo;
041:        import org.apache.commons.logging.Log;
042:        import org.apache.commons.logging.LogFactory;
043:
044:        /**
045:         * A small mbean that will act as a proxy for mod_jk2.
046:         *
047:         * For efficiency, it'll get bulk results and cache them - you
048:         * can force an update by calling the refreshAttributes and refreshMetadata
049:         * operations on this mbean.
050:         *
051:         * TODO: implement the user/pass auth ( right now you must use IP based security )
052:         * TODO: eventually support https
053:         * TODO: support for metadata ( mbean-descriptors ) for description and type conversions
054:         * TODO: filter out trivial components ( mutexes, etc )
055:         *
056:         * @author Costin Manolache
057:         */
058:        public class ModJkMX extends JkHandler {
059:            private static Log log = LogFactory.getLog(ModJkMX.class);
060:
061:            MBeanServer mserver;
062:            String webServerHost = "localhost";
063:            int webServerPort = 80;
064:            String statusPath = "/jkstatus";
065:            String user;
066:            String pass;
067:            Registry reg;
068:
069:            HashMap mbeans = new HashMap();
070:            long lastRefresh = 0;
071:            long updateInterval = 5000; // 5 sec - it's min time between updates
072:
073:            public ModJkMX() {
074:            }
075:
076:            /* -------------------- Public methods -------------------- */
077:
078:            public String getWebServerHost() {
079:                return webServerHost;
080:            }
081:
082:            public void setWebServerHost(String webServerHost) {
083:                this .webServerHost = webServerHost;
084:            }
085:
086:            public int getWebServerPort() {
087:                return webServerPort;
088:            }
089:
090:            public void setWebServerPort(int webServerPort) {
091:                this .webServerPort = webServerPort;
092:            }
093:
094:            public long getUpdateInterval() {
095:                return updateInterval;
096:            }
097:
098:            public void setUpdateInterval(long updateInterval) {
099:                this .updateInterval = updateInterval;
100:            }
101:
102:            public String getUser() {
103:                return user;
104:            }
105:
106:            public void setUser(String user) {
107:                this .user = user;
108:            }
109:
110:            public String getPass() {
111:                return pass;
112:            }
113:
114:            public void setPass(String pass) {
115:                this .pass = pass;
116:            }
117:
118:            public String getStatusPath() {
119:                return statusPath;
120:            }
121:
122:            public void setStatusPath(String statusPath) {
123:                this .statusPath = statusPath;
124:            }
125:
126:            /* ==================== Start/stop ==================== */
127:
128:            public void destroy() {
129:                try {
130:                    // We should keep track of loaded beans and call stop.
131:                    // Modeler should do it...
132:                    Iterator mbeansIt = mbeans.values().iterator();
133:                    MBeanServer mbserver = Registry.getRegistry()
134:                            .getMBeanServer();
135:                    while (mbeansIt.hasNext()) {
136:                        MBeanProxy proxy = (MBeanProxy) mbeansIt.next();
137:                        Object ooname = proxy.getObjectName();
138:                        if (ooname != null) {
139:                            ObjectName oname = null;
140:                            if (ooname instanceof  ObjectName) {
141:                                oname = (ObjectName) ooname;
142:                            } else if (ooname instanceof  String) {
143:                                oname = new ObjectName((String) ooname);
144:                            }
145:                            if (oname != null) {
146:                                mbserver.unregisterMBean(oname);
147:                            }
148:                        }
149:                    }
150:                } catch (Throwable t) {
151:                    log.error("Destroy error", t);
152:                }
153:            }
154:
155:            public void init() throws IOException {
156:                try {
157:                    //if( log.isDebugEnabled() )
158:                    log.info("init " + webServerHost + " " + webServerPort);
159:                    reg = Registry.getRegistry();
160:                    refreshMetadata();
161:                    refreshAttributes();
162:                } catch (Throwable t) {
163:                    log.error("Init error", t);
164:                }
165:            }
166:
167:            public void start() throws IOException {
168:                if (reg == null)
169:                    init();
170:            }
171:
172:            /** Refresh the proxies, if updateInterval passed
173:             *
174:             */
175:            public void refresh() {
176:                long time = System.currentTimeMillis();
177:                if (time - lastRefresh < updateInterval) {
178:                    return;
179:                }
180:                lastRefresh = time;
181:                refreshMetadata();
182:                refreshAttributes();
183:            }
184:
185:            public void refreshAttributes() {
186:                try {
187:                    int cnt = 0;
188:                    // connect to apache, get a list of mbeans
189:                    BufferedReader is = getStream("dmp=*");
190:                    if (is == null)
191:                        return;
192:
193:                    String name = null;
194:                    String att = null;
195:                    String val = null;
196:                    while (true) {
197:                        String line = is.readLine();
198:                        if (line == null)
199:                            break;
200:                        line = line.trim();
201:                        if ("".equals(line) || line.startsWith("#"))
202:                            continue;
203:
204:                        // for each mbean, create a proxy
205:                        if (log.isDebugEnabled())
206:                            log.debug("Read " + line);
207:
208:                        if (line.startsWith("[")) {
209:                            name = line.substring(1);
210:                            if (name.endsWith("]")) {
211:                                name = name.substring(0, name.length() - 1);
212:                            }
213:                        }
214:                        // Name/value pair
215:                        int idx = line.indexOf('=');
216:                        if (idx < 0)
217:                            continue;
218:                        att = line.substring(0, idx);
219:                        val = line.substring(idx + 1);
220:
221:                        if (log.isDebugEnabled())
222:                            log.debug("name: " + name + " att=" + att + " val="
223:                                    + val);
224:
225:                        MBeanProxy proxy = (MBeanProxy) mbeans.get(name);
226:                        if (proxy == null) {
227:                            log.info("Unknown object " + name);
228:                        } else {
229:                            proxy.update(att, val);
230:                            cnt++;
231:                        }
232:                    }
233:                    log.info("Refreshing attributes " + cnt);
234:                } catch (Exception ex) {
235:                    log.info("Error ", ex);
236:                }
237:            }
238:
239:            /** connect to apache, get a list of mbeans
240:             */
241:            BufferedReader getStream(String qry) throws Exception {
242:                try {
243:                    String path = statusPath + "?" + qry;
244:                    URL url = new URL("http", webServerHost, webServerPort,
245:                            path);
246:                    URLConnection urlc = url.openConnection();
247:                    BufferedReader is = new BufferedReader(
248:                            new InputStreamReader(urlc.getInputStream()));
249:                    return is;
250:                } catch (IOException e) {
251:                    log.info("Can't connect to jkstatus " + webServerHost + ":"
252:                            + webServerPort + " " + e.toString());
253:                    return null;
254:                }
255:            }
256:
257:            public void refreshMetadata() {
258:                try {
259:                    int cnt = 0;
260:                    int newCnt = 0;
261:                    BufferedReader is = getStream("lst=*");
262:                    if (is == null)
263:                        return;
264:                    String name = null;
265:                    String type = null;
266:                    ArrayList getters = new ArrayList();
267:                    ArrayList setters = new ArrayList();
268:                    ArrayList methods = new ArrayList();
269:                    while (true) {
270:                        String line = is.readLine();
271:                        if (log.isDebugEnabled())
272:                            log.debug("Read " + line);
273:
274:                        // end of section
275:                        if (line == null || line.startsWith("[")) {
276:                            if (name != null) {
277:                                cnt++;
278:                                if (mbeans.get(name) == null) {
279:                                    // New component
280:                                    newCnt++;
281:                                    MBeanProxy mproxy = new MBeanProxy(this );
282:                                    mproxy
283:                                            .init(name, getters, setters,
284:                                                    methods);
285:                                    mbeans.put(name, mproxy);
286:                                }
287:                                if (log.isDebugEnabled())
288:                                    log.debug("mbean name: " + name + " type="
289:                                            + type);
290:
291:                                getters.clear();
292:                                setters.clear();
293:                                methods.clear();
294:                            }
295:                        }
296:                        // end of data
297:                        if (line == null)
298:                            break;
299:
300:                        line = line.trim();
301:                        if ("".equals(line) || line.startsWith("#"))
302:                            continue;
303:
304:                        // for each mbean, create a proxy
305:
306:                        if (line.startsWith("[") && line.endsWith("]")) {
307:                            name = line.substring(1, line.length() - 1);
308:                        }
309:                        if (line.startsWith("T=")) {
310:                            type = line.substring(2);
311:                        }
312:                        if (line.startsWith("G=")) {
313:                            getters.add(line.substring(2));
314:                        }
315:                        if (line.startsWith("S=")) {
316:                            setters.add(line.substring(2));
317:                        }
318:                        if (line.startsWith("M=")) {
319:                            methods.add(line.substring(2));
320:                        }
321:                    }
322:                    log.info("Refreshing metadata " + cnt + " " + newCnt);
323:                } catch (Exception ex) {
324:                    log.info("Error ", ex);
325:                }
326:            }
327:
328:            /** Use the same metadata, except that we replace the attribute
329:             * get/set methods.
330:             */
331:            static class MBeanProxy extends BaseModelMBean {
332:                private static Log log = LogFactory.getLog(MBeanProxy.class);
333:
334:                String jkName;
335:                List getAttNames;
336:                List setAttNames;
337:                HashMap atts = new HashMap();
338:                ModJkMX jkmx;
339:
340:                public MBeanProxy(ModJkMX jkmx) throws Exception {
341:                    this .jkmx = jkmx;
342:                }
343:
344:                void init(String name, List getters, List setters, List methods)
345:                        throws Exception {
346:                    if (log.isDebugEnabled())
347:                        log.debug("Register " + name);
348:                    int col = name.indexOf(':');
349:                    this .jkName = name;
350:                    String type = name.substring(0, col);
351:                    String id = name.substring(col + 1);
352:                    id = id.replace('*', '%');
353:                    id = id.replace(':', '%');
354:                    if (id.length() == 0) {
355:                        id = "default";
356:                    }
357:                    ManagedBean mbean = new ManagedBean();
358:
359:                    AttributeInfo ai = new AttributeInfo();
360:                    ai.setName("jkName");
361:                    ai.setType("java.lang.String");
362:                    ai.setWriteable(false);
363:                    mbean.addAttribute(ai);
364:
365:                    for (int i = 0; i < getters.size(); i++) {
366:                        String att = (String) getters.get(i);
367:                        // Register metadata
368:                        ai = new AttributeInfo();
369:                        ai.setName(att);
370:                        ai.setType("java.lang.String");
371:                        if (!setters.contains(att))
372:                            ai.setWriteable(false);
373:                        mbean.addAttribute(ai);
374:                    }
375:                    for (int i = 0; i < setters.size(); i++) {
376:                        String att = (String) setters.get(i);
377:                        if (getters.contains(att))
378:                            continue;
379:                        // Register metadata
380:                        ai = new AttributeInfo();
381:                        ai.setName(att);
382:                        ai.setType("java.lang.String");
383:                        ai.setReadable(false);
384:                        mbean.addAttribute(ai);
385:                    }
386:                    for (int i = 0; i < methods.size(); i++) {
387:                        String att = (String) methods.get(i);
388:                        // Register metadata
389:                        OperationInfo oi = new OperationInfo();
390:                        oi.setName(att);
391:                        oi.setReturnType("void");
392:                        mbean.addOperation(oi);
393:                    }
394:
395:                    this .setModelMBeanInfo(mbean.createMBeanInfo());
396:
397:                    MBeanServer mserver = Registry.getRegistry()
398:                            .getMBeanServer();
399:                    oname = new ObjectName("apache:type=" + type + ",id=" + id);
400:                    mserver.registerMBean(this , oname);
401:                }
402:
403:                private void update(String name, String val) {
404:                    log.debug("Updating " + jkName + " " + name + " " + val);
405:                    atts.put(name, val);
406:                }
407:
408:                public Object getAttribute(String name)
409:                        throws AttributeNotFoundException, MBeanException,
410:                        ReflectionException {
411:                    if ("jkName".equals(name)) {
412:                        return jkName;
413:                    }
414:                    jkmx.refresh();
415:                    return atts.get(name);
416:                }
417:
418:                public void setAttribute(Attribute attribute)
419:                        throws AttributeNotFoundException, MBeanException,
420:                        ReflectionException {
421:                    try {
422:                        // we support only string values
423:                        String val = (String) attribute.getValue();
424:                        String name = attribute.getName();
425:                        BufferedReader is = jkmx.getStream("set=" + jkName
426:                                + "|" + name + "|" + val);
427:                        if (is == null)
428:                            return;
429:                        String res = is.readLine();
430:                        if (log.isDebugEnabled())
431:                            log.debug("Setting " + jkName + " " + name
432:                                    + " result " + res);
433:
434:                        jkmx.refreshMetadata();
435:                        jkmx.refreshAttributes();
436:                    } catch (Exception ex) {
437:                        throw new MBeanException(ex);
438:                    }
439:                }
440:
441:                public Object invoke(String name, Object params[],
442:                        String signature[]) throws MBeanException,
443:                        ReflectionException {
444:                    try {
445:                        // we support only string values
446:                        BufferedReader is = jkmx.getStream("inv=" + jkName
447:                                + "|" + name);
448:                        if (is == null)
449:                            return null;
450:                        String res = is.readLine();
451:                        if (log.isDebugEnabled())
452:                            log.debug("Invoking " + jkName + " " + name
453:                                    + " result " + res);
454:
455:                        jkmx.refreshMetadata();
456:                        jkmx.refreshAttributes();
457:                    } catch (Exception ex) {
458:                        throw new MBeanException(ex);
459:                    }
460:                    return null;
461:                }
462:
463:            }
464:
465:        }
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